一种基于降低回路电感的大电流发生设备的设计方案研究
2017-10-21陈勇许守东李胜男张丽陈罗飞
陈勇+许守东+李胜男+张丽+陈罗飞
摘要:变电站一次通流试验主要作用与CT极性正确性校验和回路正确性校验,在变电站送电阶段是一个非常重要且必要的测试环节。但由于CT变比一般较大,导致一次通流试验时对大电流发生设备电流输出要求很高,尤其是回路负载较大的情况下,要求大电流发生器具备一定的负载能力。目前,一次通流试验较为常用的方式有两种:①采用升流器通流的方式较多,设备数量多,连接复杂;②采用一体式大电流发生设备,体积大,设备沉重,不方便运输。本文主要讨论一种通过降低回路电感,从而降低回路负载的设计方案,通过本设计方案最终降低大电流发生设备负载能力,从而有利于降低大电流发生设备重量,给一次通流现场测试带来方便。
Abstract: The main function of the primary flow test of the substation and the correctness of the CT polarity check and check the correctness of the loop are a very important and necessary test link in the substation transmission phase. However, due to the CT ratio is generally larger, resulting in a flow test when the current output of high current devices require a high output, especially in the case of large loop load, requiring high current generator with a certain load capacity. At present, a flow test is more commonly used in two ways: First, the use of high-speed flow through the way, the number of devices, the connection is complex; Second, the use of one-piece high-current equipment, bulky, heavy equipment, Inconvenient to transport. This paper mainly discusses a design scheme which reduces the loop inductance and reduces the load of the loop. By reducing the load capacity of the high current generating equipment, it is beneficial to reduce the weight of the high current generating equipment and bring convenience to the flow field test.
关键词:电感;一次测试;大电流发生器;电流放大器
Key words: inductance;primary test;high current generator;current amplifier
中图分类号:TM411+.4 文献标识码:A 文章编号:1006-4311(2017)32-0092-03
0 引言
变电站一次通流是继电保护二次回路检查的一个重要环节,试验的主要目的是为了检验变电站的CT变比和校验线路差动、母线差动、短引线等保护用CT以及测量用CT、计量用CT的接线正确性,但现有一次通流设备,体积大,重量大等因素给现场测试带来不便。
1 一次通流试验的必要性和可靠性
变电站建设流程如图1所示。
一次通流试验一般在现场调试后,启动试验前进行。在调试导则、启规以及电气交接试验标准中并没有明确要对变电站进行一次通流试验,一般都在变电……
