33kv 9kv Lightning Arrester Metal Oxide Gapless 10ka ISO9001 GB Standard

 

Zinc oxide (ZnO) gapless surge arresters are used for lightning and overvoltage protection in electrical power system. The leakage current monitoring is one of the well known method for the ZnO surge arrester ageing level determination. However, the ZnO leakage current is known to be dependent on the ambient temperature. This paper aims to study the effects of temperature variation due to ambient conditions on the leakage current of ZnO surge arrester. The effect of a significant increment of leakage current with an increase in temperature may result in a wrong assesment of the ageing level of the arrester. The leakage current of three 120kV rated polymeric housed ZnO surge arresters were measured in a custom made thermally insulated enclosures at varying temperatures. Up to 20% increase in the leakage current was observed with a 20°C increment above the ambient temperature. For a typical variation of ambient temperature in Malaysia in the range of between 30°C and 40°C, the corresponding changes in the leakage current can be up to 11%. The temperature does significantly affect the leakage current measurements used for monitoring of zinc oxide surge arresters. This significant change in the leakage current due to ambient temperature variation can affect the decision in assessing the condition of surge arresters during routine monitoring.

 

Type	Rated  voltage  (kV)	MCOV  (kV)	Residual voltage (KV)			2000ms square  wave impulse  current withstand	4/1OMS high  current impulse  (kV)
			Steep  current  impulse	switching  current  impulse	8/20 ms  Lightning  current  impulse
HY10W-3	3	2.55	9.5	7.7	9	100	100
HY10W-6	6	5.1	19.5	15.4	18	100	100
HY10W-9	9	7.65	28.5	23. 1	27	100	100
HY10W-10	10	8.4	36	30	23	250	150
HY10W-11	11	9.4	40	33	30	250	150
HY10W-12	12	10.2	38.0	30.8	36	200	100
HY10W-15	15	12.7	47.5	38.5	45	200	100
HY10W-18	18	15.3	57.0	46.2	54	200	100
HY10W-21	21	17.0	66.5	53.9	63	200	100
HY10W-24	24	19.2	76.0	61.6	72	200	100
HY10W-27	27	21.9	85.5	69.3	81	200	100
HY10W-30	30	24.2	95.0	76.5	90	200	100
HY10W-33	33	26.8	104.5	84.7	99	400	100
HY10W - 36	36	29	114.0	92.4	108	400	100
HY10W-42	42	34.1	132.3	100. 1	126	400	100
HY10W-48	48	39	152.0	126.0	150	400	100
HY10W-54	54	43	171.0	139.0	162	600	100
HY10W-60	60	48	208.0	160.0	180	600	100
HY10W-66	66	52.8	230.0	172.0	198	600	100