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Other application modules

Other application modules is a group holding various application modules.

Micro-ohm

Ground impedance

Step & Touch voltage

Soil resistivity

Cable impedance measurement

Cable shield current measurement

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Micro-ohm

WARNING
Death or severe injury caused by high voltage possible
Inductive loads may contain a lethal amount of energy if charged with current. The amount of energy depends on the size of the inductive load, the strength of the applied current, and the frequency. To give an example, 350 mJ are assumed as safe according to the safety standard IEC 61010-1. Particularly critical devices are potential transformers or current transformers, but also the inductive part of other test objects can be critical.
  • If you connect loads >0.3 mH to the COMPANO 100 current output I OUT, do not touch the outputs or anything that is connected to them.

  • Make sure that such inductive loads are short-circuited and completely discharged before disconnecting it. In doubt, do not execute resistance tests on inductive loads.

Use the Micro-ohm application module to measure a device under test, for example, a shunt or a closed circuit-breaker, or to verify the integrity of a grounding system by carrying out a ground grid continuity measurement. The ground grid continuity measurement involves measuring the point-to-point resistances within a ground grid. This is to ensure that all parts of the grounding system, e.g. raisers, are properly interconnected with one another. That way, this method detects improper construction work and deterioration.

  1. Use the jog dial wheel to set a current value of your choice at I OUT.

  2. Set the Timeout. 1 second is a good default value to start with.
    To disable the timeout, set it to Off.

  3. Set a proper measurement range depending on the expected result. If in doubt, use the smallest range; the test set will notify you if the measurement range should not be sufficient.

    The 100 mV ranges in QUICK and Micro-ohm are different. The 100 mV range in the Micro-ohm application module uses an additional hardware low-pass filter to suppresses external interferences.
  4. Press the Start/Stop key to start the current output.

  5. It takes a short moment (around 500 ms) for the result to become stable. Then you will get to see the current that COMPANO 100 injected into the device under test, the measured voltage at IN 1, and the resistance value at R.

  6. The measurement stops automatically after the configured Timeout. Press the Start/Stop key to end the measurement manually.

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Ground impedance

A good substation or transmission tower grounding system is crucial to protect people from injury and equipment from damage. International standards such as EN 50522:2022, IEEE Std 80-2013 or IEEE Std 81-2012 give guidelines on how to measure the impedances of such grounding systems.

The Ground impedance application module can test smaller grounding systems with a diameter of up to 30 m/100 ft using an auxiliary current probe. With the accessory CIB1 the test current can also be injected using a de-energized medium voltage cable or overhead line of up to 10 km/6 miles. Some test setups may also require a CP GB1 for safety reasons, see CIB1 User Manual for details. Note: no other grounding system must be nearby.

For grounding systems beyond 30 m/100 ft, which can be found on medium and large distribution substations or transmission substations, preferably use OMICRON’s CPC 100 and CP CU1. With these devices you can use out of service power lines for current injection, even if these are longer than 10 km/6 miles. This also allows to inject higher test currents than provided by the COMPANO 100.

The fall-of-potential method, as it is called in the EN 50522 or IEEE standards, is a good solution for measuring the ground impedance of a substation. The current is fed into a remote ground via a long cable. This remote ground can be any ground from a simple grounding rod to another large grounding system. Usually a grounding rod, referred to as auxiliary current probe, is used. With a CIB1, the grounding system of a remote sub-station can be used to inject the test current via a de-energized power cable.

The distance between this probe and the grounding system under test should be five to ten times the diameter of the grounding system. A larger distance will provide more accurate results. In general, the setup must represent worst case conditions that may occur during a single-line fault. This must be clarified for each grounding system individually.

We recommend using an auxiliary current probe as remote ground in 150 m/450 ft distance for grounding systems up to a diameter of 30 m/100 ft.
We recommend using an de-energized medium voltage line (up to 10 km/6 miles) to inject the test current for grounding systems larger than 30 m/100 ft in diameter or in densely populated areas.

Then measure the voltages with a second test probe at various distances around the grounding system under test. If possible, choose the measurement points in a 90 º angle (bird’s-eye view) relative to the current path.

We recommend to avoid measuring close to the current path (< 60 º) to reduce the effect of mutual coupling.

The measured data at a large distance away from the grounding grid (typically three times the length of the grounding grid or, for example, 62 % of the injection distance) allow the calculation of the overall ground impedance.


DistanceEN 50522:2022IEEE 81
Auxiliary current probe distance (injection)≥ 8 times the maximum diameter of the grounding system under test but not less than 40 m (130 ft)≥ 5 times the maximum diameter of the grounding system under test
Potential probe distance (measurement) ≥ 5 times the diameter of the grounding system in measurement direction but not less than 20 m (65 ft)E.g. 62 % of the distance used for injection

We recommend to measure at different distances. If the distance is high enough, the measurement points should all show similar results. If the points are set too close to the grounding system under test, close to other grounding systems, or over buried pipes, the obtained results are not stable.

Even though this application module is optimized for the fall-of-potential method, it can also be used for the two-point and the three-point method.
 
It is also possible to perform a test using the 62 % rule mentioned in IEEE Std 80-2013 and IEEE Std 81-2012. In this case, perform a single measurement at 62 % (for example, 62 m/200 ft) of the distance of the current probe (for example, 100 m/330 ft) with the current and the potential probe in the same direction.

The example below shows the plot of the resistance in different distances from the grounding grid under test. The ground impedance to distant earth will be about 280 mΩ. By choosing a 90 ° angle for the measurement, there is no risk to get into the influence zone of the auxiliary current probe (marked red below).

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Guided workflow

The ground impedance test incorporates a guided workflow consisting of four steps that can be executed one after another.

It is always possible to return to the menu or to go back to a previous step. For example, it is possible to plot measurements, then go back to the menu and add additional measurements to the previous ones.

Some changes of the settings, such as the output setup, will invalidate results. In such a case, an explicit information dialog is shown.
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Output setup

Use the Output setup feature to find the best output and setting for the measurement. Depending on the impedance of the auxiliary current probe, the best output can be either V OUT or I OUT. If the other output is expected to provide better results, advice is given during the output setup. If using a CIB1 to inject the test current via a de-energized cable and the ground grid of a remote substation, use I OUT at the CIB1.

WARNING
Death or severe injury caused by high voltage or current possible.
Employ the proper test set.
  • Never use a COMPANO 100 to directly inject currents into power cables or overhead lines. A COMPANO 100 can be used together with a CIB1 to inject currents via a de-energized medium voltage power cable or medium voltage overhead lines of up to 10 km/6 miles (also requires a CP GB1). For other lines, use the CPC 100 test set together with CP CU1 and CP GB1.

The auxiliary current probe can carry life-threatening voltages during the test. In case of an error, unexpected high voltages can occur at output I OUT or V OUT at any time. Also the step voltage around the auxiliary current probe can be quite high.
  • Always press the emergency switching off button before working with these connectors.

  • Use the provided warning flag*) to mark the auxiliary current probe, or use grounding spikes with safety handle.

  • Mark an area of 5 m/15 ft around the electrode as dangerous zone, and position a guard outside this area to keep people from entering the dangerous zone.

In case of a high-current ground fault within the substation or at the transmission tower during the test, high voltages may occur in any wire connected to the grounding grid or leading away from it.
  • Do not touch the current probe, the potential probe or any wire without insulating gloves.

  • First insert the current probe, then connect it to the provided crocodile clamp. Before removing the current probe, disconnect the crocodile clamp.

 

*) Warning flag for auxiliary current probes provided by OMICRON.

CAUTION
Minor or moderate injury caused by tripping over the measurement cable possible.
  • If the measurement cable crosses obstacles such as roads or walkways, notify approaching persons about the cable to prevent accidents caused by tripping.

Turn the jog dial wheel until the focus is on Output setup. Then press the jog dial wheel once.

The COMPANO 100 test set's V OUT is configured as output by default.

  1. Connect the ground of the grounding system under test to the black socket of V OUT using a measurement cable. Depending of the grounding system, a Kelvin clamp, a Y clamp or Kelvin screws can be the preferred choice.

  2. Depending on the used standard, position the auxiliary current probe at the required distance . If in doubt, choose a 150 m/450 ft distance for grounding systems up to a diameter of 30 m/100 ft.

  3. Connect the auxiliary current probe to the red socket of V OUT using the cable drums and a crocodile clamp.

If at Output setup the power line frequency fNom. is set properly, the suggested frequencies should be 20 Hz above and 20 Hz below the power line frequency. The following steps of the guided workflow consist of two points per measurement with frequency-selective filtering to filter out disturbances of the power line frequency. The result is an interpolation of the two measurement points.

Automated output configuration

For most cases, it is sufficient to use the automated mode.

Press the Start/Stop button for COMPANO 100 to search for the optimum output voltage for the current test setup.

In cases, however, where the ground injection point has a particularly low impedance, it could be that, after the automated setup, the lower part of the display suggests I OUT being the better choice for the output. In such a case, simply rewire from V OUT to I OUT, and repeat the automated setup.

Manual output configuration:

In certain cases, it makes sense to apply a manual output setup configuration. To do so, switch to Manual and set the individual parameters manually. The closer you set the ± delta frequency value towards the nominal frequency fNom., the steeper the used filters operate. Consequently, measurements very close to the nominal frequency have a better noise suppression, but they also need a bit longer. The default with ±20 Hz was primarily chosen for compatibility reasons with CPC 100 and HGT1 measurements.

Other frequency values can make sense when the system frequency differs from the power line frequency, for example, in 16.7 Hz or 25 Hz railway systems. In such cases, reducing the ± delta frequency to a minimum value (> 0 Hz) proves advantageous. It is also possible to set the ± delta frequency to 0 Hz in order to perform a measurement at a single frequency. This can be used if, for example, measurements at 128  Hz are required, which is a common measurement frequency for some grounding testers.

In general, we suggest to increase the magnitude as much as possible, whereat V OUT currents slightly above 200 mA are possible. When you are in manual mode, the lower part of the display shows hints helping you to find the best output configuration.

By pressing the To menu soft key you can return to the guided workflow overview. Nevertheless, the configured settings are remembered for the following steps.

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Split factor

Turn the jog dial wheel until the focus is on Split factor. Then press the jog dial wheel once.

Split factors need to be considered on grounding systems if they are connected to other grounding systems, e.g. via overhead wires on transmission towers or via underground cables.

For typical examples of current reduction → Split factor.

The ratio (magnitude and phase angle) between effective local ground current and injected current is called current split factor r:

The term "current split factor" may be a bit misleading. Please note:

In COMPANO 100, the current split factor can be entered manually when it is known , or it can be measured.

Entering the current split factor manually:

When you know the current split factor, enter its magnitude and phase angle. A current split factor of 1 is common, for example, on a transmission tower with no ground wire or with an insulated one. For a current split factor of 1, generally 0 ° is set.

Measuring the current split factor:

Usually, the current split factor is unknown and needs to be measured.

You typically measure current reduction with a Rogowski coil. In many cases, like at a transmission tower, it is not possible to measure all currents in one step, so you have to carry out more than one measurements. These measurements can be performed one after another. COMPANO 100 will then automatically calculate the resulting overall current split factor r based on magnitudes and phases of all measurements.

It is highly important to carry out the current split factor measurements very thoroughly. Each Rogowski coil has a small arrow imprinted on it. Make sure it points into the right direction. If one single measurement is accidentally done wrong, the result of the entire ground impedance measurement will be wrong.

Some Rogowski coils have integrated power-off functions, which may switch off the measurement after a few minutes. The measurement result will be invalid in this case. Check the user documentation of your sensor on how this function works or how to disable it for the measurement. If in doubt, switch off the sensor and activate it again shortly before a measurement is performed.

It is possible to measure the current "above" or "below" the current injection point.

Performing the measurement:

  1. Configure the measurement range on the Rogowski coil. Use the smallest feasible range to increase measurement accuracy.

  2. Set the IN1 input ratio to the current measurement ratio of the Rogowski coil in the selected range, for example, 100.0 mV/A or 1.0 V/A.

    Tips:

  3. Install the Rogowski coil, for example, on a leg of the transmission tower or around a low voltage cable in a distribution substation, then connect it to the IN1 input. Verify correct polarity.

  4. Press the Start/Stop button of the COMPANO 100 test set to output the test current and to carry out the measurement.

    The measurement will be performed with the configured frequencies, and interpolated to the specified nominal frequency. Additionally, the split factor value in the display will be updated.

    • Check the current shown in the display. It should show approximately the same value as the current displayed during the output setup. If it is significantly lower, the cause may be a loose connection at the cables used for current injection.

    • Check the voltage shown in the display. It should exceed 1 mV. If it is significantly lower, the cause may be a loose connection at the cables used to connect the potential probe.

  5. Repeat steps 3 and 4, if needed (for example, on all four legs of a transmission tower or on all cable connections to other grounding systems).

All measurements have a unique ID number. If needed, individual measurements can be deleted. To do so, select the measurements using the jog dial wheel, press the wheel, select the measurement to delete, then press Delete selected.

We recommend to thoroughly document what ID is used for what current path. Add a photograph, if possible, showing the direction arrow of the Rogowski coil. For that reason, the IDs are not changed if a result is deleted later.

The current split factor is calculated from the measurements. If it goes beyond 1 or below 0, there is an error in the measurement setup.

Tip: If you doubt that your measurement is correct, you can carry it out with the other current direction, too. If there are major deviations, either an error occurred (for example, wrong direction of the arrow on the Rogowski coil, loose cable contact,...) or the injected current was too small for an accurate measurement result.

By pressing the To menu soft key you can return to the guided workflow overview. Nevertheless, the split factor (entered or measured) is remembered for the following steps.

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Measurements

Measurement setup:

Note: The point of current injection, which was defined and configured in the step Output setup, will not be altered in this chapter. It stays where it is throughout the whole procedure.

WARNING
Death or severe injury caused by high voltage or current possible.
In case of a high-current ground fault within the substation or at the transmission tower during the test, high voltages may occur in any wire connected to the grounding grid or leading away from it.
  • Do not touch the current probe, the potential probe or any wire without insulating gloves.

  • First insert the current probe, then connect it to the provided crocodile clamp. Before removing the current probe, disconnect it.

  1. Make sure that the auxiliary current probe connected to V OUT is positioned away from the COMPANO 100 test set at least 5 × the diameter of the grounding system of the transmission tower (or the substation). For that purpose, OMICRON provides 150 m of cable.

  2. Connect the black socket of the measurement input IN 1 to the grounding grid under test, e.g. using the same Kelvin clamp, Y clamp or Kelvin screw as for the current injection (→ Output setup).

  3. Position the potential probe into the soil at the required distance from the grounding system, and connect it with a crocodile clamp and the supplied cable drums to the red socket of the measurement input IN 1. If you apply the fall-of-potential method, we recommend an initial distance of 1 m/3 ft.

  4. Turn the jog dial wheel until the focus is on Measurements. Then press the jog dial wheel once.

  5. Enter the measured distance to the grounding system under test into the software, then press the Start/Stop key.

    Press the Start/Stop key

    After a short time, COMPANO 100 will stop and show a first result.

    Check the current shown in the display. It should show approximately the same value as the current displayed during the output setup. If it is significantly smaller, the cause may be a loose connection at the cables used for current injection.
  6. Now repeat that procedure by positioning the potential probe at several spots with "logarithmically" increasing distances, for example 2 m, 5 m, 10 m, 15 m, 20 m, 30 m, 40 m, 50 m, 70 m, 80 m, 100 m.

The results can be displayed with or without the current Split factor taken into account.

You can also switch between Z/Phi and R/X representation of the impedance values.

By pressing the To menu soft key you can return to the guided workflow overview. The results are kept.

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Plot

The plot displays the measured impedances at the various distances and states whether a split factor applies.

You can enter an expected maximum current towards earth in case of a fault. The second axis of the graph displays the expected ground potential raise at the various distances.

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Results

The results can be stored on a USB stick.

Excel File Loader

The Ground Impedance EXCEL template, provided with the COMPANO Excel File Loader, can be used to load the measurement, and to generate a report.

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Step and touch voltage

A step and touch voltage test is carried out to determine

The Step and touch voltage application module of COMPANO 100 acts as a source for the HGT1 accessory from OMICRON.

The HGT1 is an FFT voltmeter, primarily designed for professional acoustical test applications. For step and touch voltage and ground impedance measurements, HGT1 is delivered with an OMICRON software that allows measuring the frequency-selective voltage level by using a real-time Zoom FFT. HGT1 works as an add-on device to COMPANO 100, CPC 100 and CP CU1.

For more information about measuring with HGT1Accessory HGT1.

With COMPANO 100, it is possible to measure the step and touch voltages in smaller grounding systems with a diameter of up to 30 m/100 ft.

For grounding systems beyond 30 m/100 ft, which can be found on medium and large distribution substations or transmission substations, preferably use OMICRON’s CPC 100 and CP CU1. With these devices you can use out of service power lines for current injection, even if these are longer than 10 km/6 miles. This also allows to inject higher test currents than provided by the COMPANO 100.

During a step and touch voltage test, the current is fed into a remote ground via a long cable. This remote ground can be any ground from a simple grounding rod to another large grounding system. Usually a grounding rod, referred as auxiliary current probe, is used. The distance between this probe and the grounding system under test should be at least five times the diameter of the grounding system. A larger distance will provide more accurate results. In general, the setup must represent worst case conditions that may occur during a single-line fault. This must be clarified for each grounding system individually.

We recommend using an auxiliary current probe as remote ground in 150 m/450 ft distance for grounding systems up to a diameter of 30 m/100 ft.
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Guided workflow

The step and touch setup incorporates a guided workflow that consists of three steps, which are executed one after another. The third step generates the desired output signal, only. Do the actual measurement with HGT1.

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Output setup

Use the Output setup feature to find the best output and setting for the measurement. Depending on the impedance of the auxiliary current probe, the best output can be either V OUT or I OUT. If the other output is expected to provide better results, advice is given during the output setup.

WARNING
Death or severe injury caused by high voltage or current possible.
Employ the proper test set.
  • Never use a COMPANO 100 to directly inject currents into power cables or overhead lines. A COMPANO 100 can be used together with a CIB1 to inject currents via a de-energized medium voltage power cable or medium voltage overhead lines of up to 10 km/6 miles (also requires a CP GB1). For other lines, use the CPC 100 test set together with CP CU1 and CP GB1.

The auxiliary current probe can carry life-threatening voltages during the test. In case of an error, unexpected high voltages can occur at output I OUT or V OUT at any time. Also the step voltage around the auxiliary current probe can be quite high.
  • Always press the emergency switching off button before working with these connectors.

  • Use the provided warning flag*) to mark the auxiliary current probe, or use grounding spikes with safety handle.

  • Mark an area of 5 m/15 ft around the electrode as dangerous zone, and position a guard outside this area to keep people from entering the dangerous zone.

In case of a high-current ground fault within the substation or at the transmission tower during the test, high voltages may occur in any wire connected to the grounding grid or leading away from it.
  • Do not touch the current probe, the potential probe or any wire without insulating gloves.

  • First insert the current probe, then connect it to the provided crocodile clamp. Before removing the current probe, disconnect the crocodile clamp.

 

*) Warning flag for auxiliary current probes provided by OMICRON.

CAUTION
Minor or moderate injury caused by tripping over the measurement cable possible.
  • If the measurement cable crosses obstacles such as roads or walkways, notify approaching persons about the cable to prevent accidents caused by tripping.

Turn the jog dial wheel until the focus is on Output setup. Then press the jog dial wheel once.

The COMPANO 100 test set's V OUT is configured as output by default.

  1. Connect the ground of the grounding system under test to the black socket of V OUT using a measurement cable. Depending of the grounding system, a Kelvin clamp, a Y clamp or Kelvin screws can be the preferred choice.

  2. Depending on the used standard, position the auxiliary current probe at the required distance . If in doubt, choose a 150 m/450 ft distance for grounding systems up to a diameter of 30 m/100 ft.

  3. Connect the auxiliary current probe to the red socket of V OUT using the cable drums and a crocodile clamp.

If at Output setup the power line frequency fNom. is set properly, the suggested frequencies should be 20 Hz above and 20 Hz below the power line frequency. The following steps of the guided workflow consist of two points per measurement with frequency-selective filtering to filter out disturbances of the power line frequency. The result is an interpolation of the two measurement points.

Automated output configuration

For most cases, it is sufficient to use the automated mode.

Press the Start/Stop button for COMPANO 100 to search for the optimum output voltage for the current test setup.

In cases, however, where the ground injection point has a particularly low impedance, it could be that, after the automated setup, the lower part of the display suggests I OUT being the better choice for the output. In such a case, simply rewire from V OUT to I OUT, and repeat the automated setup.

Manual output configuration:

In certain cases, it makes sense to apply a manual output setup configuration. To do so, switch to Manual and set the individual parameters manually. The closer you set the ± delta frequency value towards the nominal frequency fNom., the steeper the used filters operate. Consequently, measurements very close to the nominal frequency have a better noise suppression, but they also need a bit longer. The default with ±20 Hz was primarily chosen for compatibility reasons with CPC 100 and HGT1 measurements.

Other frequency values can make sense when the system frequency differs from the power line frequency, for example, in 16.7 Hz or 25 Hz railway systems. In such cases, reducing the ± delta frequency to a minimum value (> 0 Hz) proves advantageous. It is also possible to set the ± delta frequency to 0 Hz in order to perform a measurement at a single frequency. This can be used if, for example, measurements at 128  Hz are required, which is a common measurement frequency for some grounding testers.

In general, we suggest to increase the magnitude as much as possible, whereat V OUT currents slightly above 200 mA are possible. When you are in manual mode, the lower part of the display shows hints helping you to find the best output configuration.

By pressing the To menu soft key you can return to the guided workflow overview. Nevertheless, the configured settings are remembered for the following steps.

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Split factor

Turn the jog dial wheel until the focus is on Split factor. Then press the jog dial wheel once.

Split factors need to be considered on grounding systems if they are connected to other grounding systems, e.g. via overhead wires on transmission towers or via underground cables.

For typical examples of current reduction → Split factor.

The ratio (magnitude and phase angle) between effective local ground current and injected current is called current split factor r:

The term "current split factor" may be a bit misleading. Please note:

In COMPANO 100, the current split factor can be entered manually when it is known , or it can be measured.

Entering the current split factor manually:

When you know the current split factor, enter its magnitude and phase angle. A current split factor of 1 is common, for example, on a transmission tower with no ground wire or with an insulated one. For a current split factor of 1, generally 0 ° is set.

Measuring the current split factor:

Usually, the current split factor is unknown and needs to be measured.

You typically measure current reduction with a Rogowski coil. In many cases, like at a transmission tower, it is not possible to measure all currents in one step, so you have to carry out more than one measurements. These measurements can be performed one after another. COMPANO 100 will then automatically calculate the resulting overall current split factor r based on magnitudes and phases of all measurements.

It is highly important to carry out the current split factor measurements very thoroughly. Each Rogowski coil has a small arrow imprinted on it. Make sure it points into the right direction. If one single measurement is accidentally done wrong, the result of the entire ground impedance measurement will be wrong.

Some Rogowski coils have integrated power-off functions, which may switch off the measurement after a few minutes. The measurement result will be invalid in this case. Check the user documentation of your sensor on how this function works or how to disable it for the measurement. If in doubt, switch off the sensor and activate it again shortly before a measurement is performed.

It is possible to measure the current "above" or "below" the current injection point.

Performing the measurement:

  1. Configure the measurement range on the Rogowski coil. Use the smallest feasible range to increase measurement accuracy.

  2. Set the IN1 input ratio to the current measurement ratio of the Rogowski coil in the selected range, for example, 100.0 mV/A or 1.0 V/A.

    Tips:

  3. Install the Rogowski coil, for example, on a leg of the transmission tower or around a low voltage cable in a distribution substation, then connect it to the IN1 input. Verify correct polarity.

  4. Press the Start/Stop button of the COMPANO 100 test set to output the test current and to carry out the measurement.

    The measurement will be performed with the configured frequencies, and interpolated to the specified nominal frequency. Additionally, the split factor value in the display will be updated.

    Check the current shown in the display. It should show approximately the same value as the current displayed during the output setup. If it is significantly smaller, the cause may be a loose connection at the cables used for current injection.
  5. Repeat steps 3 and 4, if needed (for example, on all four legs of a transmission tower or on all cable connections to other grounding systems).

All measurements have a unique ID number. If needed, individual measurements can be deleted. To do so, select the measurements using the jog dial wheel, press the wheel, select the measurement to delete, then press Delete selected.

We recommend to thoroughly document what ID is used for what current path. Add a photograph, if possible, showing the direction arrow of the Rogowski coil. For that reason, the IDs are not changed if a result is deleted later.

The current split factor is calculated from the measurements. If it goes beyond 1 or below 0, there is an error in the measurement setup.

Tip: If you doubt that your measurement is correct, you can carry it out with the other current direction, too. If there are major deviations, either an error occurred (for example, wrong direction of the arrow on the Rogowski coil, loose cable contact,...) or the injected current was too small for an accurate measurement result.

By pressing the To menu soft key you can return to the guided workflow overview. Nevertheless, the split factor (entered or measured) is remembered for the following steps.

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Output

Turn the jog dial wheel until the focus is on Output. Then press the jog dial wheel once.

You can vary the on, off and pause time to meet your needs. Press the Start/Stop key to start the output sequence. That sequence is repeated until manually stopped.

The pause time is meant to save battery power on long testing days.

We recommend synchronizing the start of the measurement with the beginning of a new minute. That way you can expect a new measurement of the HGT1 at every full and half minute if, for example, a total time of 30 seconds is used. This is useful if measurement points are far away, and you are not sure whether or not you can still measure a signal.

For more information about measuring with HGT1Accessory HGT1.

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Results

The results can be stored on a USB stick. They contain the used frequencies, the output current, and the split factor.

The Step and Touch Voltage EXCEL template, provided with the COMPANO Excel File Loader, can be used to load the data from both the COMPANO 100 test set and the HGT1, and to generate a report.

For more information about the Excel File LoaderExcel File Loader.

For more information about recording and saving step and touch voltage measurements with HGT1, please refer to the HGT1 User Manual.

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Soil resistivity

A soil resistivity test is performed prior to the construction of a grounding system in order to know about the resistivity of the soil in different layers. Its measurement results can be furthermore used in conjunction with grounding grid calculation and simulation software such as CDEGS.

The measurement delivers specific soil resistivity values for different distances between the used current and potential probes that allow drawing conclusions about the layers in the ground in larger depths.

The soil resistivity application module allows performing this test and directly evaluating the results using either the Wenner or Schlumberger method. For example, the Wenner method is shown below

The soil resistivity application module incorporates a guided workflow that consists of two steps, which can be executed one after another.

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Output setup

WARNING
Death or severe injury caused by high voltage or current possible.
In the unlikely event of an internal error of the COMPANO 100 test set, higher voltages than expected could occur at output V OUT.
  • Always press the emergency switching off button before working with these connectors.

  • Mark an area of 5 m/15 ft around the electrode as dangerous zone, and position a guard outside this area to keep people from entering the dangerous zone.

The Output setup is configured to use V OUT with 40 V in the soil resistivity application module. Since for most cases, there is no need to change this configuration, you may skip this step and progress directly to the measurement step.

However, if there are exceptional circumstances, such as a very conductive soil, reduce the voltage as the resulting current might be too high for the voltage output. In such a case, the COMPANO 100 test set would switch off with an error message. If this happens, reduce the voltage, and try again.

If the voltage needs to be adjusted, turn the jog dial wheel until the focus is on Output setup. Then press the jog dial wheel once.

A delta frequency value of ±20 Hz from the power line frequency is generally a good choice. If needed, the value can be changed, though. It is also possible to set it to 0 Hz in order to perform a measurement at a single frequency. This can be used, if you, for example, require measurements at 128 Hz, which is a common measurement frequency for some grounding testers.

You can test the output configuration by pressing the Start/Stop key.

By pressing the To menu soft key you can return to the guided workflow overview. Nevertheless, the configured settings are remembered for the following step.

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Measurements

The soil resistivity measurement screen displays the wiring setup.

COMPANO 100 supports three different methods for soil resistivity measurements.

WARNING
Death or severe injury caused by high voltage or current possible.
In the unlikely event of an internal error of the COMPANO 100 test set, higher voltages than expected could occur at output V OUT.
  • Always press the emergency switching off button before working with these connectors.

  • Mark an area of 5 m/15 ft around the electrode as dangerous zone, and position a guard outside this area to keep people from entering the dangerous zone.

Performing the measurement:

  1. Select the measurement method of your choice.

    The different methods (Wenner/Schlumberger) cannot be mixed.

  2. Place the grounding probes as shown on the display.

  3. Connect the probes to the V OUT output and the IN 1 input of the COMPANO 100 test set. To do so, use the provided measurement cables and crocodile clamps.

  4. Enter the distances to the table of the Soil resistivity screen.

  5. Press the Start/Stop key on the COMPANO 100 test set to output the test current and to carry out the measurement. The measurement will be performed with the configured frequencies, and interpolated to the specified nominal frequency.

  6. Repeat steps 3 to 5 for all measurement distances.

After the measurement, the result will be shown with a unique ID in the results list. To delete individual or all results, select the list with the jog dial wheel.

The result is shown as specific soil resistivity ρ in Ωm. Alternatively, you can also display them as raw impedance value |Z| in Ω. The raw values |Z| can be used to calculate the soil resistivity manually. This is useful if other methods are used, such as the Pole-Dipole or the Dipole-Dipole method.

Typical resistivity of common soil types:

Soil typeSoil resistivity
Moor, marsh, very moist soil1 ... 50 Ωm
Loess, clay20 ... 100 Ωm
Humus, acre10 ... 200 Ωm
Sandy clay50 ... 500 Ωm
Stony, grassy soil100 ... 300 Ωm
Glass sand200 ... 3000 Ωm
Rock300 ... 5000 Ωm
Granite, freestone1500 ... 10000 Ωm

Soil resistivity is a major factor for the corrosiveness of soil:

Corrosiveness of soilSoil resistivity
Severe< 10 Ωm
Corrosive10 ... 50 Ωm
Moderately corrosive50 ... 100 Ωm
Slightly corrosive100 ... 500 Ωm

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Results

The results can be stored on a USB stick.

The COMPANO Excel File Loader can be used to load the data from the COMPANO 100 test set. Afterwards, the data can be copied, for example, into a grounding system calculation software.

For more information about the Excel File LoaderExcel File Loader.

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Cable impedance measurement

This application module requires a CIB1 accessory. The Cable Impedance application module is used to measure the line impedance of short medium voltage cables or overhead lines with no parallel systems. The length is limited to 10 km/6 miles by the output power of the COMPANO 100 as well as safety considerations.

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Prepare test setup and work area

General information

DANGER
Death due to electric shock or burns
Extremely high voltage and high energy is present when test setup, line under test, and parallel systems are not switched off and secured correctly.
  • Follow all on site procedures to be able to bring the line out of service, switch it off and prepare it for testing.

  • Follow the five safety rules.

  • Make sure that the line under test is locked against re-activation.

  • Make sure that the line under test is grounded on both sides.

  • Make sure that during a test, the COMPANO 100 (with CIB1 connected) is the only power source for the line under test.

Setup without a CP GB1

1Grounding of COMPANO 100 and CIB14Danger zone
2Work area5Local grounding switches
3Safety barrier6Line under test

WARNING
Death due to electric shock
Active or unknown parallel systems can induce dangerous voltages into the line under test. There also is a risk of a lightning strike or fault from an energized parallel system.
  • Use a CP GB1 when testing on overhead lines.

  • Use a CP GB1 when testing on mixed lines.

  • Use a CP GB1 when testing cables with active parallel systems.

Setup with a CP GB1

1Grounding of COMPANO 100 and CIB14Danger zone
2Work area5Local grounding switches
3Safety barrier6Line under test

WARNING
Death due to physical injury
In case of a fault in the system, a high fault current is shorted to ground by the CP GB1. This leads to excessive mechanical movement of the CP GB1 and the grounding lines. The CP GB1 or other mechanical parts can hit persons nearby.
  • Connect the CP GB1 with a massive ground connection to ground and tighten it properly.

  • Observe all safety measures given in the CP GB1 user documentation.

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Guided workflow

The cable impedance application module uses a guided workflow consisting of the following steps that can be executed one after another.

WARNING
Death due to electric shock
There are exposed contacts which could carry high voltage if the working instructions are not followed properly.
  • Make sure that the line under test is de-energized.

  • Make sure that the line under test is grounded locally.

  • Press the emergency switching off button on the COMPANO 100 before working on the wiring.

Before starting an actual measurement, the local grounding of the line under test must be temporarily removed for the measurement.

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Output setup

The Output setup specifies the line under test and the test method.

  1. Connect the line under test to the COMPANO 100, using a CIB1.

  2. Use the Output setup to specify the setting for the measurement.

    The default parameters work for most applications.

  3. If necessary, change the following parameters:

WARNING
Death due to electric shock
During the test, the local grounding is removed. A dangerous voltage is present at the contact point. This can lead to an electric shock or large scale skin burns.
  • Stay in the work area during the test.

  • Do not enter the danger zone during the test.

  • Make sure that all persons stay outside the danger zone, which includes a safe distance from the CIB1 and the CP GB1.

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Measurement

The measurement screen is used to perform the actual measurement.

  1. Open the local ground switch.

  2. Press the Start/Stop key to start the measurement.

  3. Wait for the measurement to finish. It will run through the following steps:

    All calculated loop-impedances are displayed on the screen.
    Each of the measuring steps is performed for all the required current loops:

  4. If necessary, repeat the measurement by pressing the Start/Stop key again.

  5. Close the local ground switch.

Troubleshooting

Problem or error messagePossible causeMeasures
The open-loop voltage is too high to perform a current injection.The wiring is incorrect.
  • Check the wiring.

The coupling from parallel energized systems is too high.
The line under test is too long.
  • De-energize parallel systems if possible.

  • Reduce the load on parallel systems or perform the test during off-peak hours (at night).

Injection of current not possible (overload).The impedance of the line under test is too high:
  • Small diameter of conductor

  • Long line

  • High ground impedance

  • Reduce the test current to a lower value ( → Output setup).

Broken fuse
  • Refer to the CIB1 User Manual for more information.


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Calculations

The calculation screen shows the calculated results after a successfully performed measurement.

  1. Choose the desired calculation type.

    Examples:

  2. Press the button Show model to display the selected model as well as the used equations for the calculation.

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Export

The Export screen allows to export all measurement and calculated values after the measurement.

✔ A storage device (USB stick) is plugged into the USB port of the test set.

  1. Add a prefix of up to 8 characters to the file name.

  2. Press the Export (CSV) button.

    The COMPANO 100 is only able to export files to a storage device, files cannot be loaded.
    As an alternative, measurement and calculation results can be exported to the COMPANO Excel File Loader via Safe - Reporting, → COMPANO Excel File Loader.

  3. To remove the storage device from the USB port, press the Eject USB button.

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Supported line models and results

The following line models are calculated on the device and displayed directly. Data can be exported as a CSV file or saved for the Excel File Loader.

NameModelName in CSV or Excel
Raw measurementsZL1-E = L1-E
ZL2-E = L2-E
ZL3-E = L3-E
ZL1-L2 = L1-L2
ZL2-L3 = L2-L3
ZL3-L1 = L3-L1
ZL123-E = L1L2L3-E-AVG
Line model with ZEZL = Z_L
ZE = Z_E
Symmetric componentsZ1 = Z_1
Z0 = Z_0
K-factor generickL = k_L
k0 = k_0
kR = R_E/R_L
kX = X_E/X_L
K-factor with ZZL = Z_L
kL = k_L
K-factor with RN/ NXZL = Z_L
RN/R = R_N/R
XN/X = X_N/X
Physical model (unsym.)ZP11 = Z_P11
ZP22 = Z_P22
ZP33 = Z_P33
ZP12 = Z_P12
ZP13 = Z_P13
ZP23 = Z_P23
Physical model (sym.)ZP = Z_P
ZPP = Z_PP

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Cable shield current measurement

The Cable shield current application module is used to measure the currents on the cable shields of short low and medium voltage single-core cable systems, consisting of one or more parallel systems. This allows to detect unbalanced current distribution and potential overloading of cable shields. The length is limited to 10 km/6 miles by the output power of the COMPANO 100 as well as safety considerations. This application module requires a CIB1 accessory as well a suitable current clamp, → Accessories.

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Prepare test setup and work area

General information

DANGER
Death due to electric shock or burns
Extremely high voltage and high energy is present when test setup, line under test, and parallel systems are not switched off and secured correctly.
  • Follow all on site procedures to be able to bring the line out of service, switch it off and prepare it for testing.

  • Follow the five safety rules.

  • Make sure that the line under test is locked against re-activation.

  • Make sure that the line under test is grounded on both sides.

  • Make sure that during a test, the COMPANO 100 (with CIB1 connected) is the only power source for the line under test.

Setup without a CP GB1

1Grounding of COMPANO 100 and CIB14Danger zone
2Work area5Local grounding switches
3Safety barrier6Line under test

WARNING
Death due to electric shock
Active or unknown parallel systems can induce dangerous voltages into the line under test. There also is a risk of a lightning strike or fault from an energized parallel system.
  • Use a CP GB1 when testing cables with active parallel systems.

Setup with a CP GB1

1Grounding of COMPANO 100 and CIB14Danger zone
2Work area5Local grounding switches
3Safety barrier6Line under test

WARNING
Death due to physical injury
In case of a fault in the system, a high fault current is shorted to ground by the CP GB1. This leads to excessive mechanical movement of the CP GB1 and the grounding lines. The CP GB1 or other mechanical parts can hit persons nearby.
  • Connect the CP GB1 with a massive ground connection to ground and tighten it properly.

  • Observe all safety measures given in the CP GB1 user documentation.

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Guided workflow

The cable shield current application module uses a guided workflow consisting of the following steps that can be executed one after another.

WARNING
Death due to electric shock
There are exposed contacts which could carry high voltage if the working instructions are not followed properly.
  • Make sure that the line under test is de-energized.

  • Make sure that the line under test is grounded locally.

  • Press the emergency switching off button on the COMPANO 100 before working on the wiring.

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Output setup

  1. Connect the line under test to the COMPANO 100, using a CIB1.

  2. Use the Output setup to specify the setting for the measurement.

    The default parameters work for most applications.

  3. If necessary, change the following parameters:

WARNING
Death due to electric shock
During the test, the local grounding is removed. A dangerous voltage is present at the contact point. This can lead to an electric shock or large scale skin burns.
  • Stay in the work area during the test.

  • Do not enter the danger zone during the test.

  • Make sure that all persons stay outside the danger zone, which includes a safe distance from the CIB1 and the CP GB1.

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Measurement setup

This module allows to measure the shield currents on up to 9 parallel single-core cable systems as well as up to 9 auxiliary ground connectors.

Parallel systemsSpecifies the number of parallel cable systems.
  • Enter 1 for a single system or a higher number if multiple single-core cables are used per phase.

Aux. ground connectionsSpecifies the number of auxiliary ground connections like copper earth conductors used in parallel to the cable system. The application module calculates the current via these connections.
IN 2 input ratioSpecifies the ratio of the current clamp for the shield current measurement.
  • Enter a suitable measurement range at the used current clamp. Typical values are 100 mV/A or 1 V/A.


Cable shields may carry stray currents from other systems. Stray currents will be filtered out by the frequency selective measurement method and will be not visible in the results.
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Measurement

The measurement screen is used to perform the actual measurement.

The measurement has to be performed for each cable shield on each parallel system (for example, 12 times in case of 4 parallel systems with 3 cables each) as well as for each auxiliary ground connection.

✔ A current clamp is placed around the selected grounded cable shield or auxiliary ground connection and the provided Coax extension cable is used to connect it to IN2 of the COMPANO 100.

  1. In the selection box, select the cable shield or auxiliary ground connection to be tested.

  2. Make sure that polarity and measurement direction are correct:

    1. Press the Wiring button to display the wiring diagram.

    2. Compare the wiring setup with the measurement direction in the wiring diagram.

  3. Open the local ground switch.

  4. Press the Start/Stop key to start the measurement.

  5. Wait for the measurement to finish. It will run through the following steps:

    All measured raw values are displayed on the screen.

  6. Close the local ground switch.

  7. Repeat the measurement for all cable shields and auxiliary ground connections.

Troubleshooting

Problem or error messagePossible causeMeasures
The open-loop voltage is too high to perform a current injection.The wiring is incorrect.
  • Check the wiring.

The coupling from parallel energized systems is too high.
The line under test is too long.
  • De-energize parallel systems if possible.

  • Reduce the load on parallel systems or perform the test during off-peak hours (at night).

Injection of current not possible (overload).The impedance of the line under test is too high:
  • Small diameter of conductor

  • Long line

  • High ground impedance

  • Reduce the test current to a lower value (→ Output setup).

Broken fuse
  • Refer to the CIB1 User Manual for more information.


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Calculations

The calculation screen shows the calculated results after a successfully performed measurement.

The application calculates and displays the expected shield currents for a symmetric three-phase operational case. The highest values are highlighted red and the lowest values are green. This shows where to expect the highest shield currents. However, this is not an assessment of the shield current.
The results consist of the values for each cable shield on each of the parallel systems as well as the configured auxiliary ground connections.
The remaining current is displayed in the row Remaining. This value usually equals the current via all other ground connections. If there are no other ground connections than the configured auxiliary ground connections, the remaining current should be very close to zero (deviates from zero due to measurement accuracy).

Not selecting a current displays all results as percent values of a fictive operational current.
Selecting a current displays all results in Ampere, assuming the configured operational current.

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Export

The Export screen allows to export all measurement and calculated values after the measurement.

✔ A storage device (USB stick) is plugged into the USB port of the test set.

  1. Add a prefix of up to 8 characters to the file name.

  2. Press the Export (CSV) button.

    The COMPANO 100 is only able to export files to a storage device, files cannot be loaded.
    As an alternative, measurement and calculation results can be exported to the COMPANO Excel File Loader via Safe - Reporting, → COMPANO Excel File Loader.

  3. To remove the storage device from the USB port, press the Eject USB button.