由于CT/VT模块故障导致T60继电器差动保护功能误操作

2018 International Conference on Computer, Control, Electrical, and Electronics Engineering (ICCCEEE) Pub Date : 2018-08-01 DOI:10.1109/ICCCEEE.2018.8515870

O. B. Elkhidir, I. El-Amin

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引用次数: 0

摘要

T60继电器是为满足高灵敏度、高可靠性和高速度的要求而设计的一种新型数字继电器。这一发展通过降低成本、电缆和辅助设备，使变压器差动保护87T功能显著简化。但是，在变压器差动保护中仍时有发生误动的情况。本文报道了苏丹加里电厂发生的两起变压器差动保护非正常运行案例。在这两种情况下，T60继电器的CT/VT模块故障导致保护系统不必要的操作。这些故障可能是由于老化，直流电源问题或这些模块的设计。需要更多的调查来找到这些失败的根源。在这两种情况下，故障都是隐性故障，除非发生异常事件，否则继电器不会运行。如果预防性维护是有效的，故障是可以被检测和消除的。为了保证继电器的可靠性和灵敏度，应不时地进行预防性维护。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Unwanted operation of differential protection function in T60 relays due to failures in CT/VT modules

T60 relay is one of the new digital relays has been designed to meet the requirements of high sensitivity, reliability and high speed. This development led to notable simplification in transformer differential protection 87T function by reducing cost, cabling and auxiliary equipment. However, still miss-operation cases in transformer differential protection can occur from time to time. This paper reports on two unwanted-operation cases of transformer differential protection happened in Garie power plant in Sudan. In the both cases, failures in the CT/VT module of T60 relays cause unwanted operation of the protection system. These failures could be a result of aging, problems in DC power supply or from the design of these modules. More investigations are needed to find the roots of these failures. In the both cases, the failures are hidden type in which the relay will not operate unless unusual event has happened. The failures could have been detected and removed, if the preventive maintenance was effective. In order to insure reliability and sensitivity of the relays, preventive maintenance should take place from time to time.

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2018 International Conference on Computer, Control, Electrical, and Electronics Engineering (ICCCEEE)

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