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| 摘要: |
| 电厂厂用电系统绝大多数负荷为异步电动机,在电源切换过程中异步电动机和同步电动机特性差别很大,但目前切换条件主要按同步电动机并联条件考虑,这就使得转子绕组中感应出的励磁电流自适应特性得不到利用,使切换条件趋于严格。通过分析切换过程中产生的电气和机械冲击的特性,提出一些新的概念,给出一个较为宽松的切换条件:以切入后异步电动机滑差作为主要的切换限定条件,可配置略带时延(0.1s)的电流保护,在此情况下,可不必将相角差作为切换条件。 |
| 关键词: 异步电动机,自动切换,厂用电备用电源 |
| DOI： |
| 分类号:TM621.71 |
| 基金项目: |
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| Operating conditions of fast transfer equipment of plant power supply system |
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HONG Pei-sun
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| Abstract: |
| The difference between asynchronous and synchronous motors in characteristics during bus transfer is quite large and most loads of plant power supply system now are asynchronous motors,however,the operating conditions are still considered mainly as that of parallel synchronous motors,which makes the adaptive characteristic of excitation current induced in rotor winding not utilized and the transfer conditions stricter.The electrical and mechanical impact characteristics during transfer are analyzed,and some new concepts are presented to mitigate the transfer conditions:taking the slip difference of asynchronous motor after transfer as the main transfer limit and configuring the current protection with time delay of 0.1s,in this case,the phase difference condition is not necessary. |
| Key words: asynchronous motor,automatic transfer,plant standby power supply |
