How to match the voltage and current output,Relay Tester if you use three-phase voltage output at the same time,Relay Tester you can arbitrarily choose one phase current output during the test. If you use two-phase voltage output,Relay Tester you need to read the protection manual to see what wiring method is used for protection. For example,Relay Tester if you use 90° wiring, you can output according to "UAB, IC", "UBC, IA", "UCA, IB"; when you use 0° wiring,Relay Tester you often press "UAB, IA", "UBC, IB", " UCA, IC" output.

How to test the direction is simpler: Suppose a protection adopts 90° wiring, Relay Tester and the low voltage is set to 60V. The following settings can be set in the "AC test" during the test: UA=60V, the phase is 0°;Relay Tester UB=0V, the phase is 0°. Thus, UAB is 60V, 0°. Then fix the voltage and change the phase of the current IC to test the two action boundaries.

How to define the "positive" and "negative" of the maximum sensitivity angle: protection definition: the angle of the voltage leading current is positive,Relay Tester and the negative is negative. Assuming that the IC shown on the right is the sensitive angle pointing and UAB is the reference direction 0°,Relay Tester the sensitive angle of the protection is: -45°,Relay Tester the two operating boundaries are 45° and -135° (the shaded area is the operating area) .

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