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contact access the tester switch input terminal 1 , set IA = 6A, IB = IC = 0 , UA = UB = UC =
57V , the phase difference is 120 degree . Select UA, UB and UC variable, 60/1.732 = 34.64,
[Manual test] way diminishing the three-phase voltage, UA = UB = UC = 34.64V protection
action.
②
Negative sequence voltage lockout over-current protection
Assumptions: The negative sequence voltage lockout value is 7V (phase voltage), over
current fixed value is 5A. UA , UB , UC , UN ; IA , IB , IC and IN are access to the AC input
terminal of the transformer backup protection , at the same time protect export trip contact
access the tester switch input terminal 1 , set IA = 6A, IB = IC = 0 , UA = UB = UC = 0V , the
phase difference are 0, 120, 240 degree (actual negative sequence ). Select UA, UB and UC
simultaneously variable, [Manual test] way magnitude of the three-phase voltage increments,
when UA = UB = UC = 7V, protection action.
Summary of Contents for HT-802
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