[中文]1.4.4定時(shí)過(guò)載流量保護(hù)I> 50/51 電壓不足保存

　　-功能描述

　　過(guò)量電流保護(hù)被用于后備保護(hù)為保護(hù)對(duì)象的短路保護(hù)。

　　它還為下游網(wǎng)絡(luò)故障提供后備保護(hù)，從而不大可能斷開(kāi)連接危及保護(hù)對(duì)象。

　　每個(gè)三相電流單獨(dú)運(yùn)作>>常用設(shè)定值。以上這些值電流設(shè)定值被記錄下來(lái)，并分別發(fā)出信號(hào)。一個(gè)跳閘信號(hào)傳輸?shù)较鄳?yīng)的基體>>時(shí)間延誤。貶低值± 95%低于回升值。

　　在I>階段有一個(gè)欠壓階段是可以被禁用的。這一階段保持回升信號(hào)可設(shè)置密封式的時(shí)間，如果低于臨界值，在電壓正序過(guò)流后回升，可設(shè)置閾值的價(jià)值組成部分。

　　這將確保500-1計(jì)時(shí)器密封好的，并將時(shí)間來(lái)旅行相關(guān)的斷路器。如果電壓恢復(fù)到密封前的時(shí)間已過(guò)或者通過(guò)二進(jìn)制數(shù)密封電壓被鎖，例如：當(dāng)小型斷路器跳閘或如果機(jī)器被觸發(fā)，該函數(shù)將立即退出。

　　[/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.