Seven characteristics of zinc oxide arrester:
1. Large current carrying capacity: this is mainly reflected in the ability of the arrester to absorb various lightning overvoltage, power frequency transient overvoltage and switching overvoltage. The flow capacity of Tuopu Electric production fully meets or even exceeds the requirements of national standards. The line discharge level, energy absorption capacity, 4/10 nanosecond large current withstand, 2ms square wave current carrying capacity and other indicators have reached the domestic leading level.
2. Excellent protection characteristics: zinc oxide arrester is an electrical product used to protect various electrical equipment in the power system from overvoltage damage, with good protection performance. Because of the excellent non-linear volt ampere characteristics of zinc oxide valve slice, only a few hundred microamps of current can pass through under the normal working voltage, which is convenient to design a gapless structure, making it have the characteristics of good protection performance, light weight and small size. When the overvoltage intrudes, the current flowing through the hair piece increases rapidly. At the same time, the amplitude of the overvoltage is treated first to release the energy of the overvoltage, and then the zinc oxide valve piece returns to the high resistance state, making the power system work normally.
3. Good sealing performance: the arrester element has good aging performance. The high-quality composite coat with good air tightness adopts measures such as controlling the compression amount of the seal ring and drawing increasing sealant. The ceramic coat is used as the sealing material to ensure reliable sealing and stable performance of the arrester.
4. Mechanical performance: mainly consider the following three factors: 1) earthquake force; 2) The maximum wind pressure acting on the arrester: 3) The top of the arrester bears the maximum allowable tension of the conductor.
5. Good decontamination performance: gapless zinc oxide arrester has high pollution resistance. At present, the specific creepage distance specified in the national standard is: Grade II, medium pollution area: the specific creepage distance is 20mm/kv; Grade III heavily polluted area: creepage distance 25mm/kv; Grade IV extremely polluted area: specific creepage distance is 31mm/kv.
6. High operation reliability: the reliability of long-term operation depends on the quality of products and whether the selection of products is reasonable. Its product quality is mainly affected by the following three aspects: 1) the rationality of the overall structure of the arrester; 2) Volt ampere characteristics and aging resistance of zinc oxide valve plate; 3) Sealing performance of arrester.
7. Power frequency voltage withstand capacity: due to various reasons in the power system, such as single-phase grounding, long line capacitance effect and load, the power frequency voltage will rise or the transient over-voltage with high amplitude will occur. The arrester has the power to withstand a certain power frequency voltage rise for a certain period of time.
Zinc oxide arrester (hereinafter referred to as ZnO arrester) is mainly composed of zinc oxide resistor. Its nonlinear coefficient is very small, so it has good nonlinear volt ampere characteristics. Under normal working voltage, zinc oxide arrester has great resistance and presents insulation state.
Under the action of lightning overvoltage, it will present a low resistance state. The lightning current will be released, so that the residual voltage of electrical equipment in parallel with the arrester will be limited below the safe value of the equipment. After the harmful overvoltage disappears, the arrester will quickly restore high resistance and present an insulation state, thus effectively protecting the insulation of the equipment from overvoltage damage. Its volt ampere characteristic can be expressed by the formula u=Ci ", in which the nonlinear index a is related to the current density.
Zinc oxide arrester is an arrester with good protection performance. The good nonlinear volt ampere characteristics of zinc oxide make the current flowing through the arrester very small (micro ampere or milliampere level) under normal working voltage; When over-voltage acts, the resistance drops sharply, and the over-voltage energy is released to achieve the protection effect. The difference between this arrester and the traditional arrester is that it has no discharge gap and takes advantage of the nonlinear characteristics of zinc oxide to discharge current and disconnect.
Sichuan Hengsheng Zhida Technology Co., Ltd. was established on August 6, 2015, with its registered address at No. 10, 1st Floor, Building 4, No. 777, Jinfu Road, Jinniu District, Chengdu, and its legal representative is Zhou Xinya. Business scope includes computer software development, wholesale, retail, electrical equipment, mechanical equipment, office supplies, plastic products, rubber products, metal products, fire-fighting equipment, wires and cables and accessories, electronic products, fasteners, clothing shoes and hats, daily necessities, building materials, photovoltaic equipment, glass products, insulation products, textiles, chemical products (excluding dangerous goods), import and export of goods, etc.
Zhou Xinya
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