ABB ret650 Commissioning Manual

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

Contents

11. Check that the protection does not operate when the polarizing voltage is zero.12. Repeat the above described tests for the higher set steps.13. Finally, check that start and trip information is stored in the event menu.6.4.4.2 Four step non-directional residual overcurrent protection1. Do as described in "Four step directional residual overcurrent protection",but without applying any polarizing voltage.6.4.4.3 Completing the testContinue to test another function or end the testing by setting the parameterTestMode to Off under Main menu/Tests/IED test mode/1:TESTMODE. Ifanother function is tested, then set the parameter Blocked to No under Main menu/Tests/Function test modes/Current/EF4PTOC(51N67N,4IN>)/X:EF4PTOCfor the function, or for each individual function in a chain, to be tested next.Remember to set the parameter Blocked to Yes, for each individual function thathas been tested.6.4.5 Thermal overload protection, two time constants TRPTTRPrepare the IED for verification of settings as outlined in 5.1 "Preparing the IED toverify settings".Values of the logical signals for TRPTTR are available on the local HMI underMain menu/Tests/Function status/Current/TRPTTR(49,T>)/X:TRPTTR. TheSignal Monitoring in PCM600 shows the same signals that are available on thelocal HMI.6.4.5.1 Checking operate and reset values1. Connect symmetrical three-phase currents to the appropriate current terminalsof the IED.2. Set the Time constant 1 (Tau1) and Time Constant 2 (Tau2) temporarily to 1minute.3. Set the three-phase injection currents slightly lower than the set operate valueof stage IBase1, increase the current in phase L1 until stage IBase1 operatesand note the operate value.Observe the maximum permitted overloading of the currentcircuits in the IED.4. Decrease the current slowly and note the reset value.Section 6 1MRK 504 126-UEN -Testing functionality48Commissioning Manual