Siemens simoprime manual9/23/2023 ![]() ![]() – HV and LV CTs must-read values to short and reverse secondaries at TB. – Note that NGR must be shorted Or it would be burned – What about lv side y,b phases? should be short or kept open? Reverse the R phase secondary terminals at TB(HV side) and take measurements ( display and secondary) Pl inject current outside the REF CT covering zones – relay should be stable (should not trip) Inject current from low voltage side, in R phase and check for current (secondary current and display current in relay) at high voltage side. Then Inject One Phase Voltage, Then Current will flow through the Primary bushing and NHV. – Short Primary Bushing Phase R S T with secondary terminal shorted after CT. – When you create in the zone or out zone fault for REF stability there will always be a flow of current. – who knows the REF stability procedure? Both the voltage injecting method And the current injecting method? ![]()
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