保定电气厂家价格-交流无间隙金属氧化物避雷器

避雷器热缺陷基本情况 

Lightning arrester thermal defects 

　　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.   

　　停电后将故障避雷器拆除并剥离复合外套，对整体氧化锌阀片进行了直流试验，剥除复合外套后0.75倍U1mA的泄漏电流值由原来的204uA下降到150uA，但是仍超出50uA的状态检修试验规程标准。 

After the blackout and stripping of the demolition of the fault surge arrester composite coat, zinc oxide the dc test valve plates, and to the whole strip composite coat after 0.75 times U1mA leakage current value reduced to 204 from 204 ua ua, but still more than 50 ua state overhaul standard test procedures.   

　　2 发热缺陷原因分析 

2 hot defect cause analysis 

　　2.1 解体查看 

2.1 the collapse of the view 

　　将氧化锌阀片外的环氧树脂外包壳分节切割和拆除，并注意了内部结构的保护。解体后发现氧化锌阀片外绝缘层皮存在鼓胀现象，可见抽真空时可能存在密封不严。剥开外绝缘皮，发现氧化锌阀片从上至下的四分之三区域存在白色粉末物体，并且只是分布在一侧，并没有散布在整体外表面，由红外图谱与氧化锌阀片可见光照片对比可以看出，发热阀片范围和白色粉状物分布范围存在一致的对应关系，均是自高压端至下的三分之二，并且红外图谱显示避雷器在某一侧温度是最高的36.4℃，其他侧面温度相对较低2～3℃。

Outsourcing zinc oxide epoxy resin outside the valve plate shell section cutting and removal, and pay attention to the internal structure of protection. Found that zinc oxide valve plates after the break-up of ballooning in outer insulating layer skin, visible when there may be a vacuum seal is lax. Peel away insulation, found that three-quarters of the zinc oxide from top to bottom valve plates area with white powder objects, and is distributed in a side, has not spread outside the whole surface, visible-light images by infrared spectrum and zinc oxide valve plates contrast can be seen that heating valve range distribution is consistent and white powdery corresponding relation, are all from high voltage side to the two-thirds of and infrared spectrum showed that lightning arrester is among the highest in one side temperature 36.4 ℃, the other side 2 ~ 3 ℃ temperature is relatively low.