The purpose of this reference manual is to familiarize users with the CPC 100 and its various application areas. The Reference Manual should always be available where the CPC 100 is used.
Used terms
Test object The object that the CPC 100 will test, such as a current or voltage transformer. In this case, it is an electrical signal, for example at the binary input of the CPC 100, the occurrence of which causes immediate further actions, such as turning off the output signals.
Functionality of the CPC 100
Current transformer (CT)
Voltage transformer (VT)
Power transformer testing (TR)
Resistance testing
Other applications
Insulation tests (TanDelta)
Related documents
1 Safety instructions for the CPC 100 and its accessories
- Principle use according to regulations
- Operator qualifications and primary responsibilities
- Safety standards and rules
- Safety standards
- Safety rules
- Safety accessories
- Safe operation
- Designated use
- Orderly measures
- General
- Grounding
- Power supply
Unauthorized persons must be prevented from accessing and/or activating the CPC 100 or any of its accessories. Ensure that the terminals of a test object to be connected to the CPC 100 do not have any voltage potential.
Power supply from grounded grids (TN/TT)
Ensure that both the PE connection on the power supply and the ground connection on the CPC 100 have a solid, low-impedance connection to the grounding system on site. Make sure the ground clamp makes good electrical contact with the ground system on site and avoid connecting it to corroded or painted surfaces.
Power supply from isolated grids (IT)
Ensure that the ground connections of all grounded devices in use remain intact throughout the measurement procedure and are not accidentally disconnected.
Additional information
- Changing fuses
- DC output to test objects with a high inductance
- Discharging after tests on objects with a high inductance
- High-voltage and high-current outputs
- CPC 100 in combination with the CP TD
- Handling long cables
- Disclaimer
- Compliance statement
After a winding resistance measurement, the CPC 100 monitors the reduction of the current and voltage levels to zero. When the CPC 100 is switched on, consider this part of the cable as an electric shock hazard.
Declaration of conformity (EU)
Ensure that the CPC 100, cables and device under test are properly grounded as described in this manual. Before unwinding any measurement, communication, or interface cables from the CPC 100, ensure that no cables are connected to any ungrounded device under test.
FCC compliance (USA)
Before disconnecting the power extension cables to supply the CPC 100, ensure that the relevant cable is connected to a protective earth (PE) mains. Any measurement, communication, or interface cables of the CPC 100 must be located within an environment where unauthorized or inadvertent human access during use of the CPC 100 is avoided by any means necessary.
Declaration of compliance (Canada)
Recycling
At the end of its useful life, do not dispose of the test set with household waste. As part of our legal obligations under this legislation, OMICRON offers to take back the test set and ensure that it is disposed of by authorized recycling agents.
2 Introduction
Functional components of the CPC 100
- Front panel
- High-voltage and high-current outputs
- ePC interfaces
- Functional components in detail AC OUTPUTAC OUTPUT
RJ-45 socket to connect the CPC 100 to either a PC's Ethernet network card or a notebook's PC NIC. If you do this, and the CPC 100 develops too high an internal temperature, the outputs are automatically shut down.
DC OUTPUT
This high temperature occurrence can even be increased if the CPC 100 is used in a hot environment or exposed to direct sunlight. It is strongly recommended not to exceed the typical duration tmax specified for each current and voltage output (refer to 15.3 "CPC 100 outputs" on page 294).
INPUT
BIN IN
Key lock
Status lights
Emergency Stop button
Ext. Booster
CPC 100 block diagram (simplified)
Built-in ePC
The individual key function is shown on the screen with a labeled button symbol right next to the menu key. If the test parameters are set in the software's test map view, the emergency stop button is released and the key lock is set to the "unlocked" position, pressing this push button activates the CPC 100 outputs and starts a test.
How to use the CPC 100 software
- The principles of test cards and test procedures Test cardsTest cards
Test card default
Test procedure
Test procedure default
Report
Test procedure template
- Starting the software
- View selector
- Accelerator keys
- Test card view
The CPC 100 software starts in the Test Chart view and loads the standard test procedure (see “Principles of Test Charts and Test Procedures” on page 40 of this chapter). A test card inserted in the test card view loads the values from the respective test card standard.
Inserting test cards
To make the above functions visible, focus must be placed on the test map tab label, for example CTRatioV. Unlicensed test cards are shown in the Insert a new test card dialog box, but trying to insert one of them into the test procedure results in a corresponding message on the screen.
Setting up a test card
When ready, press the handwheel or the Enter key again to confirm your entry and move forward to the next user interface element you selected by turning the handwheel or the up/down keys. Put the focus on the check box, for example, and press either the Enter key or the handwheel to select/delete a check box.
Settings page
Starting a test
Temperature monitoring
- Test procedure overview
- The CPC 100 file system
- Navigating through the file system
- The menus Main file operations menu
After clearing the results and clearing all results, restart the test in the test card view by pressing the I/O (test start/stop) button. Find the test card of your choice and when it is highlighted, press the wheel or enter.
Submenu File
So for example, if you press Save, it doesn't save the test you may have highlighted in the directory tree, but the one that's currently open.
Submenu Edit
Options
Device Setup
For the default value associated with the various instantiation procedures, see Table 2-1: ”Instancing Procedures” on page 56. For the default value associated with the various instantiation procedures, see Table 2-1: “Instancing Procedures” on page 56.
Network
As the name suggests, the Auto Save feature automatically saves the current test settings at fixed intervals. There are three time intervals available (10, 30, or 60 minutes) and the OFF option, which disables automatic saving.
Supervision
Via the built-in ePC, the CPC 100 can be accessed from a stand-alone PC, for example a notebook, and via a PC network. In certain cases, for example when strong interferences are present during testing or when compensating reactors (eg CP CR500 or CP CR600) are used, the shield check will display a false error message.
Display
Synchronization
Date / Time
Regional Settings
Service
System Info
Creating defaults and templates
Initially, that is, as long as no user-defined test procedure standard is created, this default contains one blank rapid test card. Note: With the CPC 100 V0, the number of test cards in one test procedure must be limited to 15 to avoid memory problems.
Step 2
Test procedure templates
Installation of the CPC 100 Toolset
- System requirements
Putting the CPC 100 into operation
- Safety aspects
- Preparations in the substation
- Basic steps to carry out a test with the CPC 100
With the test object grounded and shorted, connect the CPC 100 to the test object according to your requirements. 10. Start the test by pressing the green I/O (test start/stop) button on the CPC 100 front panel.
Cleaning
14. After turning off the CPC 100 outputs, connect all terminals of the test object to ground and re-short circuit them using a grounding kit.
3 Measurement setup
Preparations in the substation
Basic steps to carry out a test with the CPC
- Connection
- Performing measurements
- Disconnection
Start the test by pressing the green I/O (test start/stop) button on the CPC front panel. Connect all terminals of the DUT to ground and short-circuit them with the ground kit.
Cleaning
4 Getting started with Quick
- About Quick
- Measurement settings
- The frequency-selective measurement
- Power output settings
- Trigger settings
- Rapid Fault Sense
After pressing Keep Results, the drop-down lists of the measured quantities are disabled, i.e. the quantities cannot be changed. In this case the phase angle of the output is displayed instead of the frequency.
5 Current transformer
Scope of current transformer tests
CTRatio (and burden)
- Testing ratio, polarity (and burden) with injection into current input current input
Test settings
Three methods to determine I sec
Measurements
The "Measure burden" option
Note: For CTs that have a hole instead of a primary busbar, loop the high current cable through the hole and connect the high current terminals together.
Additional measurements when "Measure burden" is selected
Option "Manual input" selected
- Testing ratio, polarity (and burden) with a current clamp
- CTBurden
- Test settings
- Measurements
- CTExcitation (knee point)
- Test settings
- Automatic test vs. manual test Automatic testAutomatic test
Alternatively, it is possible to enter the manually measured value into the test card after stopping the test (for example, if the measurement was carried out in a remote location). Once the test is completed and the knee point is calculated according to the selected method, it is possible to switch between IEC/BS, ANSI 45° and ANSI 30°.
Manual test
Demagnetization
Direct currents (DC) or unsymmetrical alternating currents (eg asymmetries when the CT is off) can cause residual induction in the CT cores. In order to reduce the residual induction to zero, the CT cores should be demagnetized after all DC CT tests, for example after measuring the CT winding resistance or measuring the contact resistances of the primary circuit.
Winding Resistance
- Test settings
- Measurements
- Temperature compensation Option selected: Option selected
Before disconnecting the test leads, first short the transformer terminals and then remove the wiring to the CPC 100. If n/a appears in the VDC box, reduce the test current to below the voltage generated at the transformer secondary winding 10 V to decrease.
Option cleared
Voltage Withstand test
- Test settings
For example, VWithstand test card can be selected in CT, VT, Resistance and Transformer. Use the VWithstand test card to measure the voltage resistance of the secondary winding and secondary wiring.
Option "Auto"
Measurements
After all settings are defined, press the I/O (test start/stop) button to start the test. IAC: the current measured between the primary and secondary windings of the transformer at the moment the test is turned off.
Polarity Check
CPOL2 battery
Test settings
Note: Please note the allowable duty cycles that may apply to the selected AC output range. As a rule, do not use the Settings page, but the Device Settings tab in the Options view (see "Device Settings" on page 56) to set up the test cards.
Carrying out the polarity check
Customizing test point names
CTRatioV (with voltage)
- Test settings
- Measurements
Generally, a good choice is to set the test voltage to 75% of the knee point voltage. Set the value of your choice either by turning the handwheel and/or by entering it with the numeric keys.
CTRogowski (ratio)
- Test settings
- Measurements
A value set with the numeric keys must be entered completely and accepted by pressing either Enter or the handwheel before it is applied to the output. Enter the measured Vsec value either by turning the handwheel or entering this value with the numeric keys and press Enter or the handwheel to accept your setting.
CTLow Power (ratio)
- Test settings
- Measurements
Note: If the test includes an external amplifier to gain a higher output current, set this amplifier in the Device Configuration Options tab before starting the test. The measured transformation ratio of the instrument under test transformer can be adjusted with the given ratio and phase correction values.
TanDelta - PF
Ratio with sampled values
- Glossary
- General setup
- Test settings
- Measurements
- Tests
Aggregation Unit (MU) An Aggregation Unit collects the analog inputs from four voltage and four current transformers and sends them as a digital sample value stream (SV) in Ethernet packets to a destination MAC address along with the name (SVID) (a clear text) string) and the APPID (a number) of the fusion unit. If a new SV ratio test card is inserted, the MU of the preceding test card is retained as default.
Automatic channel detection vs. manual channel selection
Primary injection (of the whole system): By taking the amplitude response of the signal processing chain (CPC 100 -> CT/VT -> MU -> CPC 100), you can check the frequency behavior of the whole cycle. Alternatively, you can also inject directly into the MU channels to check the amplitude response.
6 Voltage transformer
Scope of voltage transformer tests
VTRatio
- Test settings
- Measurements
If you select the Manual entry check box, you can enter a value for Vsec manually, for example when Vsec was measured with an external voltmeter and not at the V1 AC input. Note: The value set with the number keys must be entered in full and confirmed by pressing Enter or the handwheel before it is used for output.
VTBurden
- Test settings
- Measurements
Note: If a current clamp is used to measure Isec, select the corresponding check box on the test card and specify the current clamp device in the Device Setup "Options" tab. Enter the measured Isec value by either turning the handwheel or entering this value with the numeric keys and press Enter or the handwheel to accept your setting.
Voltage Withstand test
Polarity check
- Test settings
- Carrying out the polarity check
- Customizing test point names
A dangerous voltage level can occur in the battery compartment if the CPOL2 probe touches a high voltage potential test point. Now perform the polarity check at the test point you selected using CPOL2.
VTElectronics
- Test settings
- Measurements
Amplitude correction: Amplitude correction to calculate the corrected transformation ratio Phase correction: Phase error offset to calculate the corrected phase error. By default, the phase correction is set to 0.0000° and no additional phase error is subsequently considered.
TanDelta - PF
Ratio with sampled values
7 Transformer
Scope of transformer tests
Transformer Ratio (per tap)
- Test settings
- Automatic Tap Fill
The TRRatio test card settings page offers an offline auto top-up feature. Automatically populates the TRRatio test card rated ratio table for balanced switches.
Carrying out a TRRatio test (per tap)
Entering the tap number during or after a test
TRRatio according to IEC 61378-1
Prim/H Sec/X
Vector Group Check
Before starting the Vector Group Check, use the Demag test board with Wiring set to Yd5 or Dy5 (see "Degaussing" on page 203 of this chapter) to ensure reliable results. To start the Vector Group Check, enter the test voltage and frequency in the VG-Check test card.
Winding Resistance
- Test settings
- Measurements
To do so, loop the I DC current signal from the CPC 100 6A DC output via the IAC/DC as shown in Figure 7-14 and inject it into the transformer winding. The IAC/DC measures the injected current and the VDC input measures the voltage generated by the transformer winding.
OLTC test (per tap)
- Test settings
- Measurements
- Examples using the TRTapCheck test card
It is recommended that all winding resistance measurements be made with the CP SA1 connected to the CPC 100 V DC inputs to protect yourself and the CPC 100 from high voltage hazards. This adds a new line to the measurement table and the next measurement can be started.
Measuring the winding resistance of the taps
Press the context-sensitive menu keys Keep result or Keep result automatically to save the actual result in the measurement table. After pressing the Auto Keep Result menu key, the CPC 100 waits until stable results with a deviation smaller than the defined tolerance (in %) are achieved within the defined settling time (t).
Editing the tap number during or after a test
Tap changer test and measuring the winding resistance
Tap Changer Cleaner Sequence
Note: The Tap Changer Clear Sequence can only be activated if the CP SB1 transformer breaker box is connected and Auto Tap is selected. Note: You can only interrupt the Tap Changer Cleaning Sequence by pressing the Emergency Stop button.
Dynamic OLTC-Scan (DRM)
Set the transformer wiring configuration, number of taps and test current on the test card.
Status icons
Available menu keys
