KYORITSU 6050 - Uc TESTS; Principles of Measurement; Uc Testing

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FortheRCDrangeofModel6050,distortionfactoroftestcurrent
isimproved compared withour traditional instruments. Therefore,
atoperatingtime measurement ofRCD,operating time ofsome
RCDandourtraditionalinstrumentsmaydifferalittle.
7.UcTESTS
● Theearth electrode resistance of a measuring circuit with a probe
shallnotexceedtable1(page12).
7.1PrinciplesofMeasurement
Infig.16,whengroundingisincompleteandRexists,voltageoccursto
Riffaultcurrentflowsin R. Person may touchthisvoltage,andthe
voltageoccurstoapersonatthisboutiscalledasUc.AtUctest,the
value,whenUcreachesmaximum,iscalculated.
7.2UcTesting
7.2.1Preparation
(1)TurnFunctionswitchandpowerontheinstrument.SelectUc.
(2)Pressthe"I⊿n/LOOP/PSC"SELECTSWITCHtosettheRated
TrippingCurrent (I⊿n) to the rated trip current of the RCD. Every
time"I⊿n/LOOP/PSC"SELECTSWITCHispressed,▼markon
LCDshifts.SelectI⊿nwithaboveswitch.
7.2.2WiringCheck
(1)InserttheTestLeadintotheinstrument.(Fig.15)
(2)Connecttestleadtoobjecttobetested.(Fig.16,17)
(3)MakesurethattheP-EandP-NwiringCheckLEDsarelitandthe
wiringincorrectLED is notlit.Ifitisnotcorrect,disconnectthe
testerandcheckthewiringforapossiblefault.
I⊿n 30mA
TheInitialvalue