| 金属氧化物避雷器发热缺陷检测及处理方案分析 |
| 添加时间：2017/5/22 10:40:20 浏览次数： |
| 金属氧化物避雷器MOA是目前变电站限制雷电侵入波过电压的主要设备，常用的无间隙氧化锌避雷器其阀片具有着高涌流能力和很好的非线性特征，有效保护电气设备避免因过电压而造成绝缘击穿。如果避雷器存在发热等缺陷将失去保护作用，造成设备损坏甚至变电站停电等事故，因此运行中必须对避雷器工作状态和性能进行检测。在利用红外线精确测温技术对某变电站110kV II母线避雷器进行测试时，发现B相避雷器呈现出发热趋势，对此本文进行了深入分析。 Metal oxide surge arrester earth-sized is main equipment of the current transformer substation lightning invasion wave overvoltage limit, commonly used no clearance zno arrester the valve has the high flow ability and good nonlinear characteristics, effective protect electrical equipment from the insulation breakdown caused by over voltage. If lightning arrester where defects such as fever will lose protection, equipment damage and even substation blackout accident, therefore in the operation of the lightning arrester must be working status and performance testing. Accurate temperature measurement using infrared technology in a substation 110 kv bus II arrester test, found that B phase arrester present hot trend, this article carried on the thorough analysis to this. 1 避雷器热缺陷基本情况 The basic condition of the lightning arrester thermal defect 110kV II母线所采用的避雷器为YH10WZ-100/200型无间隙氧化锌避雷器，内部由氧化锌阀片串联叠装而成直接承受电网运行电压，正常情况下氧化锌阀片具有较高的涌流能力和非线性特征，绝缘外套由硅橡胶和高强度环氧玻璃纤维套管制成。该避雷器户外配置，常年经受雨雪、污秽及温度变化的影响，运行环境较为恶劣，试验人员8月27日在红外精确测温时发现B相避雷器中上部存在发热，最高温度达34.9℃，下部温度29.6℃，单节温差较大，并对3相避雷器进行了带电测试：A相全电流0.607mA、阻性电流峰值0.094mA，B相全电流0.709mA、阻性电流峰值0.111mA，C相全电流0.613mA、阻性电流峰值0.097mA。 110 kv bus bar of II type arrester YH10WZ - 100/200 no clearance zinc oxide lightning arrester, internal composed of zinc oxide valve series overstow run directly under grid voltage, under normal circumstances zinc oxide valve with high flow ability and nonlinear characteristics, insulation coat made of silicone rubber and high strength epoxy glass fiber casing. The lightning arrester outdoor configuration, weather rain and snow all the year round, filthy and the influence of temperature change, running environment is relatively poor, test personnel on August 27 in the precise infrared temperature measurement, it found that B phase arrester upper exist in the heating, the highest temperature of 34.9 ℃, the lower the temperature of 29.6 ℃, single section temperature difference is bigger, and the three phase arrester was charged test: A phase current 0.607 mA, impedance peak current 0.094 mA, B phase all current 0.709 mA, resistance current peak value 0.111 mA, phase C all current 0.613 mA, resistance current peak value 0.097 mA. |
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