ABB ret650 Commissioning Manual

Also see for ret650: Applications manual Commissioning manual Commissioning manual Product guide Applications manual

Contents

5.2 Activating test modePut the IED into the test mode before testing. The test mode blocks all functions inthe IED, and the individual functions to be tested can be unblocked to preventunwanted operation caused by other functions. In this way, it is possible to testslower back-up measuring functions without the interference from faster measuringfunctions. Test mode is indicated when the yellow Start LED flashes.Procedure1. Select Main menu/Tests/IED test mode/1:TESTMODE2. Set parameter TestMode to On.3. Save the changes.As a consequence, the yellow Start LED starts flashing as a reminder andremains flashing until the test mode is switched off.5.3 Preparing the connection to the test equipmentThe IED can be equipped with a test switch of type RTXP8, RTXP18 or RTXP24.The test switch and its associated test plug handle (RTXH8, RTXH18 or RTXH24)are a part of the COMBITEST system, which provides secure and convenienttesting of the IED.When using the COMBITEST, preparations for testing are automatically carriedout in the proper sequence, that is, for example, blocking of tripping circuits, shortcircuiting of CT’s, opening of voltage circuits, making IED terminals available forsecondary injection. Terminals 1 and 8, 1 and 18 as well as 1 and 12 of the testswitches RTXP8, RTXP18 and RTXP24 respectively are not disconnected as theysupply DC power to the protection IED.The RTXH test-plug handle leads may be connected to any type of test equipmentor instrument. When a number of protection IEDs of the same type are tested, thetest-plug handle only needs to be moved from the test switch of one protection IEDto the test switch of the other, without altering the previous connections.Use COMBITEST test system to prevent unwanted tripping when the handle iswithdrawn, since latches on the handle secure it in the half withdrawn position. Inthis position, all voltages and currents are restored and any reenergizing transientsare given a chance to decay before the trip circuits are restored. When the latchesare released, the handle can be completely withdrawn from the test switch,restoring the trip circuits to the protection IED.If a test switch is not used, take measures according to provided circuit diagrams.Never disconnect the secondary connection of a current transformercircuit without short-circuiting the transformer's secondarywinding. Operating a current transformer with the secondary1MRK 504 126-UEN - Section 5Testing IED operation33Commissioning Manual