Metal oxide surge arrester (MOA) is recognized as the upto-date overvoltage protector which ,due to the inherent superior nonlinear V-A characteristics and steep-wave response of metal oxide varistors ,can suppress overvoltages to a relative low level ,thus providing a reliable protection for insulation of electrical apparatus.
The basic technical parameters are complied with the technical specification of IEEE and IEC60099-4
1. GENERAL
Metal oxide surge arrester (MOA) is recognized as the upto-date overvoltage protector which ,due to the inherent superior nonlinear V-A
characteristics and steep-wave response of metal oxide varistors ,can suppress overvoltages to a relative low level ,thus providing a reliable
protection for insulation of electrical apparatus.
The basic technical parameters are complied with the technical specification of Chinese Standard GB11032-2000 which is exactly equivalent to
IEC60099-4
2. TECHNICAL DATA
ZINC OXIDE PROTECTIVE CHARACTERISTICS (5kA NORMAL DUTY POLYMER)
Voltage
Rating
(Ur)
(kVrms)
MCOV
(UC)1
(kVrms)
Max.
Equiv.
FOW2
(kV Crest)
Max. Switch
Surge3
(kV Crest)
Max .Discharge voltage (kV Crest)
Using 8/20 s Current Impulse
1.5
kA
2.5 kA 3.0
kA
5.0 kA 10
kA
20
kA
40
kA
3 2.55 10.0 7.9 8.5 8.8 8.9 9.4 10.2 11.3 13.3
6 5.10 19.9 15.8 16.9 17.5 17.7 18.8 20.4 22.5 26.6
9 7.65 29.9 23.7 25.4 26.2 26.6 28.2 30.5 33.8 39.9
10 8.40 32.9 26.3 28.1 29.2 29.6 31.3 33.9 37.4 43.9
12 10.20 39.8 31.6 33.8 34.9 35.4 37.6 40.7 45.0 53.1
15 12.70 49.8 39.5 42.2 43.6 44.3 47.0 50.9 56.3 66.4
18 15.30 59.7 47.4 50.7 52.3 53.1 56.4 61.0 67.5 79.7
21 17.00 69.7 55.3 59.1 61.0 62.0 65.7 71.2 78.7 92.9
24 19.50 79.6 63.2 67.6 69.7 70.8 75.1 81.3 90.0 106.2
27 22.00 89.6 71.1 76.0 78.4 79.7 84.5 91.5 101.2 119.5
30 24.40 99.5 78.8 84.2 87.4 88.7 93.9 101.7 112.0 131.7
33 26.80 109.5 86.7 92.6 96.2 97.6 103.3 111.9 123.2 114.9
36 30.00 119.4 94.6 101.0 104.9 106.4 112.7 122.0 134.4 158.0
High-Current Short Duration: 2 current surges of 65kA magnitude and 4/10s wave shape.
Low-Current Long Duration : 20 current surges of 75 A magnitude and 2000s duration .
1 MCOV=Maximum Continuous Operating Voltage that may be applied continuously between the terminals of the arrester.
2 The equivalent Front-of -Wave is the maximum discharge voltage for a 5kA impulse current wave which produces a voltage wave cresting in
0.35s.
3 Based on a switching surge current impulse of 45×90s, 500 amperes.
4 The equivalent Front-of-Wave is the maximum discharge voltage for a 10kA impulse current wave which produces a voltage wave cresting in
0.5s.
2
3.APPLICATION CONDITION
3.1 Normal Service condition
Surge arresters which conform to this standard shall be suitable for normal operation under the following normal service conditions:
Ambient air temperature within the range of -40 to +40.
Solar radiation :
The effects of maximum solar radiation (1.1kW/m2)have been taken into account by preheating the test specimen in the type tests. If there are
other heat sources near the arrester, the application of the arrester shall be subject to an agreement between the manufacturer and the
purchaser.
Altitude is not exceeding 1000m.
Frequency of the A.C power supply is not less than 48Hz but not more than 62HZ.
Power frequency voltage applied continuously between the terminals of the arrester is not exceeding its continuous operating voltage.
Mechanical conditions ;no strong vibration.
Pollution conditions: no requirement at this time.
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