1、装设避雷器保护,防止雷击过电压：配变的防雷保护，采用装设无间隙金属氧化物避雷器作为过电压保护，以防止由高低压线路侵入的高压雷电波所引起的变压器内部绝缘击穿，造成短路，杜绝发生雷击破坏事故。采用避雷器保护配变时，一是要通过正常渠道采购合格产品，安装投运前经过严格的试验达到运行要求再投运；二是对运行中的设备定期进行预防性试验，对于泄漏电流值超过标准值的不合格产品及时加以更换；三是定期进行变压器接地电阻检测，对100KVA及以上的配电变压器要求接地电阻必须在4Ω以内，对100KVA以下的配电变压器，要求接地电阻必须在10Ω以内。如果测试值不在规定范围内，应采取延伸接地线，增加接地体及物理、化学等措施使其达到规定值，每年的4月份和7月份进行两次接地电阻的复测，防止焊接点脱焊、环境及其它因素导致接地电阻超标。如果变压器接地电阻超标，雷击时雷电流不能流入大地，反而通过接地线将雷电压加在配电变压器低压侧再反向升压为高电压，将配变烧毁；四是安装位置选择应适当，高压避雷器安装在靠配变高压套管最近的引线处，尽量减小雷电直接侵入配变的机会，低压避雷器装在靠配变最近的低压套管处，以保证雷电波侵入配变前的正确动作，按电气设备安装规范标准要求安装，防止盲目安装而失去保护的意义。

1, installing surge arrester protection, prevent the lightning overvoltage: with lightning protection, furnish non-clearane metal oxide arrester as over-voltage protection, in order to prevent the intrusion by the high and low voltage lines of high voltage transformer internal insulation breakdown caused by thunder electric wave, causing short circuit, put an end to a lightning strike damage accident. A lightning arrester protection with varying, one is to through normal channels to purchase qualified products, through strict test before installation was put into again meet the operation requirements of commissioning; 2 it is to run the equipment periodic preventive test, the leakage current value over standard unqualified products in a timely manner to replace; 3 it is transformer grounding resistance test on a regular basis, distribution transformer of 100 kva and above requirements earthing resistance must be within the 4 Ω, distribution transformer of 100 kva below, request earthing resistance must be within 10 Ω. If the test value is beyond the scope of regulation, should be taken to extend the grounding line, increase the grounding body and physical, chemical and other measures to the specified value, twice each year in April and July grounding resistance survey, prevent weld desoldering, environment and other factors lead to excessive grounding resistance. If transformer grounding resistance levels of lightning when lightning current cannot flow into the earth, but through the grounding line ray voltage on the low voltage side of distribution transformer in reverse booster for high voltage, will match get burned; Four is installation location should be appropriate choice, high voltage lightning arrester installed in the lead by the distribution transformer hv bushing recently, minimize directly caused by lightning intruded into the match opportunity, low voltage surge arrester with recent changeable loading on low pressure casing, to ensure the correctness of thunder electric wave invasion with former changeable actions, according to the standards required to install electrical equipment installation specification, the significance of losing protection to prevent blind installation.

　　2、装设速断、过电流保护，保证有选择性地切除故障线路：配变的短路保护和过载保护由装设于配变高压侧的熔断器和低压侧的漏电总保护器（该装置有漏电保护和配变低压过电流保护）来实现。为了有效地保护配变，必须正确选择熔断器的熔体(熔丝、熔片等)及低压过电流保护定值。高压侧熔丝的选择，应能保证在变压器内部或外部套管处发生短路时被熔断。

2, installing a quick break, over current protection, guarantee the selective removal of fault line, with short circuit protection and overload protection by installed in with low side and high side of the fuse changeable total leakage protector (the device have been low pressure leakage protection and current protection). In order to effectively protect the match changed, must be correct choose fuse melts (fuse, fuse link, etc.) and low voltage overcurrent protection fixed value. High side fuse choice, should be able to ensure the transformer internal or external casing short circuit when the fuse.