| After-sales Service: | Lifetime Technical Support |
|---|---|
| Warranty: | 1 Year for Dynamic Circuit Breaker Timer |
| Type: | Dynamic Circuit Breaker Timer |
| Accuracy Grade: | 1 |
| Load Way: | Electronic Load |
| Loading Method: | Dynamic Load |
| Customization: |
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Test Circuits for Secondary lnjection Testing
The test circuits used will depend on the type of relay and test set being used. Unless the test circuits are simple and obvious, the relay commissioning manual will give details of the circuits to be used.
Commonly used test circuits are listed in the table below.
When using the circuits in this reference, suitable simplifications can easily be made if digital or numerical relays are being tested, to allow for their built-in measurement capabilities - external ammeters and voltmeters may not be required.
| Test 1 | Three phase non-directional pick up and drop off accuracy over complete current setting range for both stages |
| Test 2 | Three phase directional pick up and drop off accuracy over complete RCA setting range in the forward direction, current angle sweep |
| Test 3 | Three phase directional pick up and drop off accuracy over complete RCA setting range in the reverse direction, current angle sweep |
| Test 4 | Three phase directional pick up and drop off accuracy over complete RCA setting range in the forward direction, voltage angle sweep |
| Test 5 | Three phase directional pick up and drop off accuracy over complete RCA setting range in the reverse direction, voltage angle sweep |
| Test 6 | Three phase polarising voltage threshold test |
| Test 7 | Accuracy of DT timer over complete setting range |
| Test 8 | Occuracy of IDMT curves over claimed accuracy range |
| Test 9 | Accuracy of IDMT TMS/TD |
| Test 10 | Effect of changing fault current on IDMT operating times |
| Test 11 | Minimum Pick-Up of Starts and Trips for IDMT curves |
| Test 12 | Accuracy of reset timers |
| Test 13 | Effect of any blocking signals, opto inputs, VTS, Autoreclose |
| Test 14 | Voltage polarisation memory |
All results should be carefully noted and filed for record purposes. Departures from the expected results must be thoroughly investigated and the cause determined.
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