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| 摘要: |
| 目前无人值守的变电站大量投入运行，从现场运行的情况看，保护装置电源和操作电源是彼此独立的，因此检修时只需单独退出操作电源，但又由于微机保护均由TWJ继电器常开接点启动重合闸，所以在检修完后投入操作电源的同时，断路器将立即合闸，如果断路器是检修热备等情况时，就可能将断路器误投入运行，提出了三种解决方案，一是通过运行规程规定运行的操作和步骤避免运行人员误投断路器，但可行性不好；二是将启动重合闸的TWJ的常开接点改为断路器机构箱内的断路器辅助常闭接点，此法可行；对于已运行的线路保护适宜采用方案三，即利用装置操作箱中的合闸，跳闸常闭接点串联或者是中间断电器串电阻直接在正负电源两端用其常闭的接点来闭锁重合闸。 |
| 关键词: 无人值守变电站 重合闸回路 异常合闸分析 装置电源 控制电源 |
| DOI： |
| 分类号:TM63 TM762 |
| 基金项目: |
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| Abnormal closure of re-closure circuits in unmanned substation and its countermeasures |
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XUE Yu-long JIA Xiang-en
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| Abstract: |
| The unmanned substations are widely operating recently.According to the site operating con-ditions,the device protection power supply and the device operating power supply are indepen-dent to each other,so it is necessary to switch off the operating power supply only in repairing the device.As the re-closure function of microprocessor-based protection is initiated by the normal-open contacts of TWJ relay,the circuit breaker will close immediately when switch on the operating power supply after repairing.Maloperation will take place if the circuit breaker is under maintenance and stand-by situations.Three solutions are detailed.Set up the operation regulations for operators,its feasi-bility is not good.Use the auxiliary NC contacts of circuit breaker in switchgear instead of the NO con-tacts of TWJ relay.Use the NC contacts of the close and open relays in the protection device connecting in serial.Alternatively,use the NC contacts of an interposing relay to block re-closure,which is direct-ly connected to the positive and negative ends of DC power supply through a resistance.It is suitable for the operating line protections. |
| Key words: re-closure,installation's power source,power source for control, |
