Testing based evaluation of technical specification of metal oxide varistors zinc in the high voltage 110kv surge arrester (15/08/2014)

Nguyen Huu Kien
National Key Laboratory for High Voltage Techniques, Institute of Energy

 Standard test with  8/20  s pulse for V-MOV-ZnO resitor block at HVLAB
This paper presents the results of experiment based evaluation method for technical characteristics of metal oxides varistors zinc (V-MOV-ZnO)which makes up 110 kV surge arrester. All tests were implemented at the National Key Laboratory for High Voltage Techniques - Institute of Energy (HVLAB). The 8/20s standard lightning impluse current tests were performed to test for the residual voltage; the voltage-current characteristics of metal oxides varistor zinc V-MOV-ZnO. Moreover, the voltage-current characteristics of V-MOV-ZnO was tested with 1mA current passed through resistor plate of V-MOV-ZnO. Once voltage applying to the V-MOV-ZnO is greater than Upeak, a small increasement of voltage will result in a very high current passing through the V-MOV-ZnO. This feature is used to discharge the lightning when very high transient over-voltage occurs. Upeak is reffered as a limit which must be taken into account  when designing the V-MOV-ZnO arrester. All testing results practically allow to evaluate quality of the V-MOV-ZnO on some aspects arrcording to IEC 60099-4 and to ensure the effectiveness of surge arrester if utilized.
Key words: metal oxides varistor zinc; V-MOV-ZnO; surge arrester, test.
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