Meidensha ZL-8A Series Distribution Class Surge Arresters

Manufacturer: Meidensha Corporation
Model: ZL-8A Series

Features

A practical simple single gap and high performance zinc oxide blocks ensure that this surge arrester is compact and light weight. A reduced discharge voltage has improved the protective performance. Hardly any change in performance of the gap due to contamination, it maintains its stable operatimg performance, protecting distribution equipment from surge voltages.
Excellent protective performance
Managing multiple lightning surges and frequent surges
Excellent resistance to contamination
Compact, lightweight, and easy to handle

Applications and Solutions

It is an arrester for distribution substation for 6 kV system of nominal discharge current 2,500 A.

Specifications

Characteristics of SORESTER for distribution substation

ZL-8A	ZL-8AX	ZL-8AX-M
Type		standard type	contamination resistant type	contamination resistant type (with a mold cone)
Resistance against contamination (salt content attachment density mg/cm2)		0.06	0.35	0.35
Rated voltage(kV, r.m.s.)		8.4
Nominal discharge current(A, peak value)		2500
Commercial frequency discharge start voltage(kV, r.m.s.)		13.9 or more (15 or more)
Voltage resistance (container only)	Commercial frequency (kV, r.m.s.)	22		22(28)
Voltage resistance (container only)	Lightning impulse (kV, peak value)	60		60(90)
Lightning impulse discharge start voltage (kV, peak value)	100%	33 or less (30 or less)
Lightning impulse discharge start voltage (kV, peak value)	0.5µs	38 or less (33 or less)
Discharge voltage (8/20 µs, 2,500 A) (kV, peak value)		33 or less (22 or less)
Rated discharge withstand current	Lightning impulse heavy current (kA) (4/10 µs)	10 X 2 times (50 X 2 times)
Rated discharge withstand current	Square wave (A) (2 ms)	75 X 20 times (150 X 20 times)
Lightning surge operation duty(8/20 µs, 2,500 A)		Same polarity and reverse polarity, each 5 times