I check PT fuses first whenever the event records look inconsistent. Reversed CTs flip the measured angle. I always verify polarity during relay testing before any protection scheme goes live. Technical Trainer in Power System Protection & Automation (IEC61850, SIPROTEC, ABB Relion, Omicron, SEL, GE, MiCOM, ETAP, Digsilent, PSCAD,. ) Practical sections with testing of the relays (ABB REG670, MiCOM P441, MiCOM P123,. )The testing and verification of relay protection devices can be divided into four groups: Type tests are needed to prove that a protection relay meets the claimed specification and follows all relevant standards. Since the basic function of a protection relay is to correctly function under abnormal. Relay testing is the process of verifying that protective relays are calibrated correctly and functioning accurately. Even if the scheme has been thoroughly tested in the factory, wiring to the CTs and VTs on site may be incorrectly carried out, or the CTs/VTs may have been. The technical problem to be solved by the present invention is to provide a test method using capacitance compensation for relay protection vector inspectio the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn. Tests are conducted on site before commissioning. Tests are conducted during periodic maintenance. There is generally a good deal of co-operation between electricity boards and relay manufacturers regarding relay testing.
