HVTest HT-802, Руководство пользователя

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The output voltage of the tester connects to the voltage coil of the relay, the input
terminal 1 is connected to the relay action contacts, when the starting voltage is less than the
termination voltage, the program will automatically test the voltage in increment; When
starting voltage is greater than the termination voltage, the program automatically test the
voltage in descending and automatic measure the return voltage and calculate return voltage
coefficient.
Section 7 Differential Test
This procedure is used for testing ratio control and harmonic control characteristics of
microprocessor-based differential protection devices. This instrument is a three-phase current
differential test.
1. Three-phase differential (six-phase differential) test
(1) Definition of current
IA is connected with the current input end on the high voltage side; IB with current input
end on the low voltage side; IC will be used for compensating current. When the phase of
high voltage side is adjusted, IC is used for the compensating current on high voltage side; IC
is also used for low voltage side compensating current when the phase of low voltage side is