1100kV/1200kV断路器大功率试验(英文)

High-Power Testing of 1100kV/1200kV Circuit Breakers

特高压(UHV)断路器试验本身就是一项挑战,当前,KEMA已开发了用于超高压和特高压开关设备大功率测试装置。鉴于特高压断路器一般至少由双断口灭弧室组成,需要做验证其正常电流(或故障电流)开断能力的局部试验,可以只针对断路器单断口(即断路器的1/2或1/4)来进行。例如,装有均压电容的瓷柱式断路器的情形就是这样。然而,为满足对金属封闭式开关设备的试验要求(见IEC61633),在带电部件和外壳之间以及在分闸过程应具备正确的电介质应力,不做断路器整极试验在技术上是不正确的。这就要求开发新的UHV断路器试验电路。关键之处在于使用一种双级合成电路,其中一级电路放置在测试对象的附近。这种做法的好处是,测试对象的外壳可以保持地电位。各种800kV以及1100或1200kV断路器整极全面试验均证明这种方法是有效可行的。文章中展示了试验的例子。

The testing of circuit breakers for UHV （ultra high voltage） is a challenge in itself, and KEMA now has developed test installations for high-power testing EHV and UHV switchgear. Given the fact that these breakers consist normally of at least two breaking chambers, a part of the test that have to verify the （fault） current interruption capability, can be performed using only half（or a quarter） of the breaker. For live-tank breakers equipped with grading capacitors this is generally true. However, in order to meet the requirements for metal enclosed switchgear （as laid down in IEC 61633） of having the correct dielectric stresses between live parts and enclosure also during the interruption process, tests other than on the complete circuit breaker are technically incorrect. This resulted in the design, realization and testing of new circuits for UHV. Key feature is the use of a double stage synthetic circuit, one stage of which is placed in the vicinity of the test-object. This has the advantage that the test-object＇s enclosure can remain on ground potential. Various lull-scale tests have now proved this principle to be effective for 800 kV and 1100 kV/ 1 200 kV on a full-pole basis. Examples of tests are demonstrated in this paper.