Sepam - HV/MV Protection and control units (ENG) - Trinet

TestingGeneral informationProcedureSet the parameters(use the setting sheets which are included in theappendix to record the values)c Statusc Control logicc Differential protection settingPerform testingDifferent test methods are proposed:c Differential protection testing with simplifiedparameterization.This parameterization may be used to check theprotection operating curve using two single-phaseinjection units. The outputs used for tripping andindication are disabled, which makes it possible tocarry out this test while the network is operatingnormally.c Cabling testing by current injection:correct cabling and parameterization of the differentialprotection may be checked by injecting a knowncurrent in the protection and reading the phasecurrents, differential currents and restrained currentsmeasured by the protectionAt the time of start-up, this test is the only one that isrequired.c Restricted earth fault protection test.Equipmentc Two 50 Hz (60 Hz) single-phase current generators,in phase with each other.c 2 ammeters.c this document.c 1 TSM 2001 pocket terminal.Inhibition of outputsand test parameterizationDisabling of outputsIt is useful to be able to inhibit differential protection actions, in particular to runtests while the electrical distribution system is operating normally.Parameter KP9 is used for inhibition. It consists of disabling differential protectionswitching of outputs O1, O2, O12 and O13, assigned to tripping and indication.Output O14 (differenital protection indication) remains valid and is used to testprotection operation.KP6 = 0 KP9 = 0 No inhibition Outputs: all validIndicator: -Message : ------------KP9 = 1 Inhibition Outputs: O1 - O2 - O12 - O13not activated by differentialO11 - O14 validIndicator: test lit upMessage: INHIBIT.Test modeThe test mode is designed to simplify current injection for the differential protectiontest.The test mode is obtained by using the KP6 parameter. The changeover to testmode automatically parameterizes a Dd0 coupling and a rated transformer currentIb = In and Ib' = In' and invalidates the switching of the O1 - O2 - O12 - O13outputs. Upon the return to normal mode (KP6 = 0), the initial parameter settingsare recovered and the outputs become active again.Changeover from normal mode to test mode: KP6 = 1Changeover to test Automatic Outputs: O1 - O2 - O12 -mode (whatever the inhibition O13 inoperativevalue of KP9)O11 - O14operative"Test" indicator onMessage: TEST COUPL.Test mode: KP6 = 1KP9 0 ➞ 1➞ 0 Cancels Outputs: all operativeor inhibition "Test" indicator blinkingKP9 1➞ 0Message: TEST COUPL.Return to normal mode: KP6 = 0KP9 = 0 No inhibition Outputs: all operativeIndicator offMessage: --------------ResetKP9 = 1 Inhibition Outputs: O1 - O2 - O12 -O13 inoperativeO11 - O14operative"Test" indicator onMessage: INHIBITReset3/2 Testing