Metal Oxide Varistor for Arrester
Main principle
ZnO lightning arrester is one kind of most advanced over-voltage protector at present in the world, due to its core components of resistance applying ZnO and other metal oxide to make of comparing with traditional carborundum arrester, it improves greatly V-A characteristics of resistance, increases the getting through ability of resistance, thereby it brings fundamental, change to features of arresters.
Under normal working voltage, the current passing arrester only A class, when bearing over voltage. The excellent non-linear V-A features of arrester would make effect, the current passing through the arrester increase high to thousands of Ampere instant the arrester is under getting through state, to release over-voltage energy therefore it errective limits the demage to power transmission equipments due to over voltage.
ZnO lightning arrester is one kind of protecting equipments preventing electric equipments in AC power system from high voltage and over-voltage operation.
Type meaning
Technical parameters and dimensions of common metal oxide varistors
1. Metal oxide varistor for low voltage arrester
| Type |
dimensions (mm) |
DC U 1mA (kV) |
leak current under 0.75U1mA (≯μA) |
voltage ratio 1.5kA U1.5KA/U1mA |
impulse current withstand capacity |
non-linear coefficient α 10μA ~1mA (≮) |
Aging test 115ºC, 1000h |
| diameter |
height |
rectangular impulse 2ms (A) |
High current impulse 4/10μs (kA) |
| D1-1 |
32±1 |
3±0.5 |
≥0.6 |
7 |
1.6 |
1000 |
50 |
20 |
chareability 85% Kct≤1.0 |
| D1-2 |
35±1 |
3±0.5 |
≥0.6 |
7 |
1.6 |
1000 |
50 |
20 |
| D2-1 |
32±1 |
6±0.5 |
≥1.2 |
7 |
1.6 |
1000 |
50 |
20 |
| D2-2 |
35±1 |
6±0.5 |
≥1.2 |
7 |
1.6 |
1000 |
50 |
20 |
2. Metal oxide varistor for counter and monitor
| Type |
dimension (mm) |
DC U 1mA (kV) |
LEAK current under 0.75U1mA (≯μA) |
8/20 μs lightning impulse residual voltage (≯μA) |
impulse current withstand capacity |
current range for action 8/20 μs (A) |
| diameter |
height |
5kA |
10kA |
rectangular impulse 2ms (A) |
high current impulse 4/10 μs (kA) |
| DF-1 |
52±1 |
6±0.5 |
0.4~0.55 |
10 |
1.0 |
1.1 |
600 |
1000 |
50-10000 |
| DF-2 |
62±1 |
6±0.5 |
0.4~0.55 |
10 |
1.1 |
1.2 |
800 |
1000 |
50-10000 |
| DF-3 |
72±1 |
7±0.5 |
0.4~0.60 |
10 |
|
1.2 |
1000 |
1000 |
50-20000 |
3. Metal oxide varistor for 3~10kV arrester
| Type |
dimensions (mm) |
DC U 1mA (kV) |
leak current under 0.75U1mA (≯μA) |
voltage ratio 1.5kA U1.5KA/U1mA |
impulse current withstand capacity |
non-linear coefficient α 10μA ~1mA (≮) |
Aging test 115ºC, 1000h |
| diameter |
height |
rectangular impulse 2ms (A) |
High current impulse 4/10μs (kA) |
| D3-1 |
28±1 |
24~30±0.5 |
4.8~5.7-7.2 |
7 |
1.82 |
150 |
65 |
23 |
chareability 85% Kct≤1.0 |
| D3-2 |
30±1 |
24~30±0.5 |
4.8~5.7-7.2 |
7 |
1.80 |
170 |
65 |
22 |
| D3-3 |
32±1 |
24~30±0.5 |
4.8~5.7-7.2 |
7 |
1.78 |
200 |
65 |
22 |
| D3-4 |
35±1 |
24~30±0.5 |
4.8~5.7-7.2 |
8 |
1.75 |
250 |
70 |
22 |
4. Metal oxide varistor for 20~35kV arrester
| Type |
dimensions (mm) |
DC U 1mA (kV) |
leak current under 0.75U1mA (≯μA) |
voltage ratio 1.5kA U1.5KA/U1mA |
impulse current withstand capacity |
non-linear coefficient α 10μA ~1mA (≮) |
Aging test 115ºC, 1000h |
| diameter |
height |
rectangular impulse 2ms (A) |
High current impulse 4/10μs (kA) |
| D4-1 |
38±1 |
24~30±0.5 |
4.8~5.5-7.2 |
10 |
1.75 |
300 |
≥80 |
20 |
chareability 85% Kct≤1.0 |
| D4-2 |
42±1 |
24~30±0.5 |
4.8~5.5-7.2 |
10 |
1.71 |
400 |
≥90 |
20 |
| D5-1 |
46±1 |
24±0.5 |
4.6~5.5 |
15 |
1.70 |
450 |
100 |
19 |
| D5-2 |
48±1 |
24±0.5 |
4.6~5.5 |
15 |
1.68 |
500 |
100 |
18 |
5. Metal oxide varistor for 66~110kV arrester
| Type |
dimensions (mm) |
DC U 1mA (kV) |
leak current under 0.75U1mA (≯μA) |
voltage ratio 1.5kA U1.5KA/U1mA |
impulse current withstand capacity |
non-linear coefficient α 10μA ~1mA (≮) |
Aging test 115ºC, 1000h |
| diameter |
height |
rectangular impulse 2ms (A) |
High current impulse 4/10μs (kA) |
| D5-3 |
52±1 |
24±0.5 |
4.6~5.5 |
15 |
1.64 |
600 |
100 |
18 |
chareability 90% Kct≤1.0 |
| D5-4 |
53±1 |
24±0.5 |
4.6~5.5 |
15 |
1.63 |
650 |
100 |
18 |
| D6-1 |
56±1 |
24±0.5 |
4.6~5.5 |
15 |
1.62 |
800 |
100 |
17 |
6. Metal oxide varistor for 220~330kV arrester
| Type |
dimensions (mm) |
DC U 1mA (kV) |
leak current under 0.75U1mA (≯μA) |
voltage ratio 1.5kA U1.5KA/U1mA |
impulse current withstand capacity |
non-linear coefficient α 10μA ~1mA (≮) |
Aging test 115ºC, 1000h |
| diameter |
inner diameter |
height |
rectangular impulse 2ms (A) |
High current impulse 4/10μs (kA) |
| D6-1 |
56±1 |
|
24.0±0.5 |
4.6~5.5 |
15 |
1.73 |
800 |
100 |
17 |
chareability 90% Kct≤1.0 |
| D6-2 |
62±1 |
|
22.5±0.5 |
4.0~5.2 |
15 |
1.71 |
1000 |
100 |
16 |
| D6-2 |
62±1 |
19±1 |
22.5±0.5 |
4.0~5.2 |
15 |
1.71 |
1000 |
100 |
16 |
Frequently Asked Question (FAQ)
Q:
About the company
A: Westhomes® is a professional manufacturer for low voltage and high voltage electrical products with a thirty-year history.
Main supplier of state-owned companies like China Stae Grid, China Southern Power Grid through bidding with bunches of test certificates, sales records and operation performance to support.
Enough investment for research and development for the products innovation.
Q:
About Warranty
A: 18 months from the date of receivement
Q:
About shipment method
A: Depends on the required quantity and delivery urgency, both international express like UPS / DHL / EMS / HK EMS / FedEx / TNT (door to door service) and normal sea shipping & air freight also avaliable.
Q:
About MOQ
A: Upto the client
Q:
About payment method
A: We accept T/T, Paypal, Western union, L/C. Normally 30% payment in advance, 70% before delivery.
Q:
About ordering process
A: First to send an inquiry via made-in-china platform or directly to the contact e-mail address. All the following thing is the communication between us.
Contact
Ms Stephanie Huang
Senior Sales Manager
Add: Liushi Town, Yueqing City, Zhejiang Provine, China 325604
http://westhomes.en.made-in-china.com/
Mob: 0086-13868328363
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