过量电流保护设备说明书翻译

　　[中文]1.4.4定时过载流量保护I> 50/51 电压不足保存

　　-功能描述

　　过量电流保护被用于后备保护为保护对象的短路保护。

　　它还为下游网络故障提供后备保护，从而不大可能断开连接危及保护对象。

　　每个三相电流单独运作>>常用设定值。以上这些值电流设定值被记录下来，并分别发出信号。一个跳闸信号传输到相应的基体>>时间延误。贬低值± 95%低于回升值。

　　在I>阶段有一个欠压阶段是可以被禁用的。这一阶段保持回升信号可设置密封式的时间，如果低于临界值，在电压正序过流后回升，可设置阈值的价值组成部分。

　　这将确保500-1计时器密封好的，并将时间来旅行相关的断路器。如果电压恢复到密封前的时间已过或者通过二进制数密封电压被锁，例如：当小型断路器跳闸或如果机器被触发，该函数将立即退出。

　　[/中文]

　　[外文]1.4.4 Definite time overcurrent protection I> 50/51 with undervoltage seal-in

　　- Functional description

　　The overcurrent protection is used as backup protection for the short circuit protection of the protected object.It also provides backup protection for downstream network faults which are not promptly disconnected and thus may endanger the protected object.

　　Each phase-to-phase current is compared individually with the I>> common setting value. Currents

　　above these value are recorded and signalled individually. A trip signal is transmitted to the matrix as soon as corresponding T I>> time delays have elapsed.The drop-out value is ± 95% below the pick-up value.

　　The I> stage has an undervoltage stage that can be disabled. This stage maintains the pick-up signal for a settable seal-in time if the value falls below a settable threshold of the positive sequence component of the voltages after an overcurrent pick-up value. This will ensure that the 500-1 timer is sealed in, and will time out to trip the associated circuit breaker. If the voltage recovers before the seal in time has elapsed or if the undervoltage seal-in is blocked via a binary input-e.g. when the voltage transformer MCB trips or if the machine is tripped, the function will drop out immediately.

　　The seal-in logic operates separately for each phase. The first pickup of a phase overcurrent starts thetimer T-SEAL-IN.