Relay Protection Relay Tester Transformer
Release Time : 2017-01-02 View Count : 次Relay protection tester transformer compound voltage blocking (direction) overcurrent protection,Relay Tester which is one of the common backup protections of current large-capacity transformers. When using the "AC test" for simulation,Relay Tester the following points should be noted: how to output a composite voltage,Relay Tester which means low voltage and negative sequence voltage. When blocking overcurrent,Relay Tester these two voltages are "or".
In other words, it can be understood as a combination of two sets of protections: "low voltage blocking (direction) overcurrent" and Relay Tester "negative sequence voltage blocking (direction) overcurrent". General protection provides two sets of voltage input terminals,Relay Tester one set for input of low voltage (positive sequence voltage) and one set for input of negative sequence voltage. Therefore,Relay Tester the wiring of the voltage during the test is different.
In the protection setting list, "low voltage" and "negative sequence voltage" often refer to the line voltage,Relay Tester which can be divided by 1.732, converted into phase voltage,Relay Tester and tested by the tester to output three-phase voltage. During the low voltage test,Relay Tester set the three-phase voltage phase in the "AC test" as 0°, -120°, 120°;Relay Tester for the negative sequence voltage test, set the three-phase voltage phase in the "AC test" as: 0°, 120°,Relay Tester -120°.
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