描述

?RED670?1MRK000028-CAR01? 通過對比線路兩端的電流量來判斷被保護(hù)線路是否有故障

線路差動(dòng)保護(hù)是一種繼電保護(hù)裝置，?RED670?1MRK000028-CAR01基于基爾霍夫電流定理工作，通過比較被保護(hù)線路各端電流的大小和相位來判斷線路是否有故障。

在正常運(yùn)行情況下，進(jìn)出被保護(hù)設(shè)備的電流大小相等，相位相同。如果設(shè)備發(fā)生故障，這一平衡就會(huì)被破壞。線路差動(dòng)保護(hù)正是利用這一原理，通過對比線路兩端的電流量來判斷被保護(hù)線路是否有故障。

當(dāng)設(shè)備出現(xiàn)故障時(shí)，流進(jìn)被保護(hù)設(shè)備的電流和流出的電流不相等，差動(dòng)電流大于零。當(dāng)差動(dòng)電流大于差動(dòng)保護(hù)裝置的整定值時(shí)，保護(hù)裝置會(huì)動(dòng)作，將被保護(hù)設(shè)備的各側(cè)斷路器跳開，使故障設(shè)備斷開電源。

線路差動(dòng)保護(hù)一般分為縱聯(lián)差動(dòng)保護(hù)和橫聯(lián)差動(dòng)保護(hù)。縱聯(lián)差動(dòng)保護(hù)是按照比較被保護(hù)線路各端電流的大小和相位的原理來實(shí)現(xiàn)的。在輸電線兩側(cè)裝設(shè)性能和變比完全相同的電流互感器，其二次側(cè)同極性端用導(dǎo)引線連接，取差動(dòng)回路中的電流進(jìn)行相位和幅值作為比較。

此外，?RED670?1MRK000028-CAR01母線差動(dòng)保護(hù)也是差動(dòng)保護(hù)的一種，它將母線上所有的各連接元件的電流互感器按同名相、同極性連接到差動(dòng)回路，通過比較流入和流出母線的電流來判斷母線是否有故障。

總的來說，?RED670?1MRK000028-CAR01線路差動(dòng)保護(hù)是一種有效的電氣保護(hù)方法，可以快速地檢測并隔離故障，保證電力系統(tǒng)的穩(wěn)定運(yùn)行。

?RED670?1MRK000028-CAR01? 通過對比線路兩端的電流量來判斷被保護(hù)線路是否有故障

Line differential protection is a relay protection device, RED670 1MRK000028-CAR01 based on Kirchhoff’s current theorem, by comparing the size and phase of the current at each end of the protected line to determine whether the line has a fault.

In normal operation, the current to and from the protected device is equal in magnitude and phase. If the equipment fails, this balance can be disrupted. Line differential protection is the use of this principle, by comparing the current flow at both ends of the line to determine whether the protected line has a fault.

When a device fails, the current flowing into and out of the protected device is not equal, and the differential current is greater than zero. When the differential current is greater than the setting value of the differential protection device, the protection device will act, and the circuit breakers on each side of the protected device will be switched off, so that the faulty device is disconnected from the power supply.

Line differential protection is generally divided into longitudinal differential protection and transverse differential protection. The longitudinal differential protection is realized according to the principle of comparing the magnitude and phase of the current at each end of the protected line. Current transformers with identical performance and ratio are installed on both sides of the transmission line, and the same polarity end of the secondary side is connected by a guide line.

In addition, RED670 1MRK000028-CAR01 bus differential protection is also a kind of differential protection, which connects all the current transformers of the connecting elements on the bus to the differential circuit by the same name and the same polarity, and determines whether the bus is faulty by comparing the current in and out of the bus.

In general, RED670 1MRK000028-CAR01 line differential protection is an effective electrical protection method, which can quickly detect and isolate faults to ensure the stable operation of the power system.

 

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