CU-Ps Primary Current Injection Test Set

The CU-Ps primary current injection test set is ideally suited to commissioning and maintenance testing where very high currents are required.

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• 20kVA 5 minutes output capability (higher overload currents for 1s)
• Multi-function digital timing system
• 5000A and 6000A loading units
• Separate control and loading units
• Secondary injection up to 100A
• Direct reading CT ratio and polarity
• True RMS metering with 1 cycle capture
• Data storage to USB memory key including waveform & harmonics
• USB keyboard interface

The CU-Ps primary current injection test set is ideally suited to commissioning and maintenance testing where very high currents are required. The system consists of separate control and loading units for maximum flexibility. The control unit contains all control and metering circuitry, and is linked to the loading unit by control and metering cables. The control unit may be used with one of two loading units providing between 5000A or 6000A for 5 minutes or up to 10 or 12kA for short periods. Each loading unit has two outputs which may be connected in series or parallel for maximum flexibility. For example, the PLU-6k may be configured to either give a maximum current of 3000A at 6.6V or 6000A at 3.3V.

The control and loading units are each housed in tough steel cases fitted with castors and protective lifting handles. The loading units have a small plan area to allow them to be positioned as close as possible to the test object, minimising power requirements and maximising the available current. The CU-Ps control unit is shown here with a PLU-6k loading unit. This combination may be used to inject currents of up to 6000A for 5 minutes or 12000A for 1 second. The CU-Ps primary current injection test set is ideally suited to all primary current injection tasks, including testing under and over current relays, circuit breakers and CT ratio testing.

The control unit is rated at 20kVA and has digital metering. A memory facility is provided on the metering to hold the current reading when the output trips or is switched off. The current is automatically switched off when the device under test trips. The CU-Ps systems have a high accuracy timing system with 1ms resolution. Selection for normally open or normally closed contacts is automatic, and the status of the contacts is shown on the front panel. Timing modes are available for under and over current devices, reclosers, under and over voltage devices, current trips and circuit breakers.

The AC output current is metered by a true RMS memory ammeter (acquisition time 20ms) with a liquid crystal display. The current metering has 3 ranges corresponding to 10%, 50% and 100% of the maximum rating of the loading unit. In addition, a 200% metering range is enabled in pulse mode for the 0.2s, 0.5s and 1s settings only.

The CU-Ps systems have a flexible timing system with two contact inputs and 5 operating modes. Each contact circuit automatically selects for N/O or N/C contacts, and the status of each contact input is shown by an LED. The timing channels may also be triggered by a dc voltage between 24 and 240V. *Pulse mode applies current to the load for a maximum of the specified time. If contact set 1 changes state or the current drops below 20% of the metering range during the pulse time, the timer is stopped. The maximum output current is increased in pulse mode. The maximum obtainable current is set by the impedance of the test object and output leads. **Current operated mode is used to time circuit breakers with no auxiliary contacts. The timer is started when the current exceeds 20% of the selected metering range (e.g. 1000A on the PLU-5k 5000A range). The timer stops when the current falls.

All test results from the CU-Ps can be stored in a USB memory key. The unit has a real-time clock to time and date-stamp all results. To log the results, first enter a comment for your results using the optional keyboard, and then select AUTO STORE. Whenever the timer stops, the time, current and all other parameters are added to a spreadsheet file on the USB key. You can then view the current set of results on the display or take the USB key out and open the file on your PC. All results are stored in a folder on the USB key named with the test date in a file named with the time.

The CU-Ps primary current injection test sets and loading units are CE marked and are designed to meet the requirements of BS EN61010. The system is protected by electronic trips on the outputs, circuit breaker and fuse on the mains input, and a circuit breaker on the control unit output. The unit also has a duty cycle trip on the loading unit output and thermal protection.