| Breaking Capacity: | High Voltage Circuit Breakers |
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| Operation: | Manual Type |
| Speed: | High-Speed Circuit Breaker |
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| Currency: | US$ |
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| Return&refunds: | You can apply for a refund up to 30 days after receipt of the products. |
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Audited Supplier Zinc oxide arrester is a new type of arrester, which is mainly composed of zinc oxide varistors. Each varistor has a certain switching voltage (called varistor voltage) since it was made. Under normal working voltage (that is, less than the varistor voltage), the varistor value is large, which is equivalent to the insulation state, but under the impact voltage (greater than the varistor voltage), the varistor is broken down at a low value, which is equivalent to the short-circuit state. However, the insulation state can be restored after the varistor is hit; When the voltage higher than the voltage sensitive voltage is removed, it returns to the high resistance state. Therefore, if the zinc oxide arrester is installed on the power line, when the lightning strikes, the high voltage of the lightning wave makes the varistor breakdown, and the lightning current flows into the earth through the varistor, the voltage on the power line can be controlled within a safe range, thus protecting the safety of electrical equipment.
Ceramic surge arresters are used in AC 220KV and below power generation, power transformation, power transmission, and power distribution systems. They are used to limit the amplitude of lightning and internal operating overvoltages to specified levels. They are the basic equipment for the insulation coordination of the entire system.
Product Structural features and scope of useProduct feature:
1. Flow capacity
This is mainly reflected in the arrester's ability to absorb various lightning overvoltages, power frequency transient overvoltages, and operating overvoltages.
2. Protection characteristics
Zinc oxide arrester is an electrical product used to protect various electrical equipment in the power system from overvoltage damage, and has good protection performance. Because the nonlinear volt-ampere characteristics of the zinc oxide valve is very good, only a few hundred microamps of current flow through under the normal working voltage, which is convenient to design into a gapless structure, so that it has good protection performance, light weight and small size. feature. When the overvoltage invades, the current flowing through the valve increases rapidly, and at the same time limits the amplitude of the overvoltage and releases the energy of the overvoltage. After that, the zinc oxide valve returns to the high-resistance state to make the power system work normally.
3. Sealing performance
Arrester components adopt high-quality composite jacket with good aging performance and good airtightness. Measures such as controlling the compression of the sealing ring and adding sealant are adopted. The ceramic jacket is used as the sealing material to ensure reliable sealing and stable performance of the arrester.
4. The mechanical performance
mainly considers the following three factors: the earthquake force withstood; the maximum wind pressure acting on the arrester; the maximum allowable tension of the wire on the top of the arrester.
5. Anti-pollution performance
The gapless zinc oxide arrester has high anti-pollution performance.
The specific creepage distance grades stipulated by the national standard are: Class II moderately polluted area: creepage specific distance 20mm/kv; Class III heavily polluted area: creepage specific distance 25mm/kv; Class IV extremely heavy polluted area: creepage specific distance 31mm/kv.
6. High operational reliability
The reliability of long-term operation depends on the quality of the product and whether the selection of the product is reasonable. The quality of its products is mainly affected by the following three aspects: the rationality of the overall structure of the arrester; the volt-ampere characteristics and aging resistance of the zinc oxide valve plate; the sealing performance of the arrester.
7. Power frequency tolerance
Due to various reasons in the power system, such as single-phase grounding, long-term capacitance effect, and load rejection, etc., the power frequency voltage will increase or a transient overvoltage with a higher amplitude will be generated. The arrester has the function of Ability to withstand a certain power frequency voltage rise within a certain period of time.
operating environment:
1.for indoors and outdoors;
2.Ambienttemperature:-40ºC to +55ºC;
3.ASL: ≤2000m;
4.Power frequency: (48~62) Hz.;
5.Earthquake intensity at 7degrees or below;
6.Wind velocity not greater than 42m/s;
7.Power frequency voltage continuously applied between terminals of a surge arrester should not exceed its continuous operating voltage;
8.Maximum solar radiation: 1.1kW/m2;
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