分布式发电机组并网10kV开关站的保护新逻辑

A New Relay Protective Scheme for Distributed Generations Interconnecting with 10 kV Switching Station

针对目前分布式发电机组通过10kV开关站（开闭所）与系统并网比较普遍，但系统采用继电保护配置显得十分困难的情况，从理论上分析了常见保护配置方案的缺陷，这些缺陷使中压（6～35kV）系统供电质量降低，而系统保护配置本应最大限度地满足对用户的优质供电。因此针对分布式发电机组通过10kV开关站与系统并网的情况提出一种新保护逻辑的继电保护方案，不仅通用性强、易于计算还可大大提高供电可靠性、减少投资费用。

Now it is common that distributed generations （DG） are interconnected with the bulk power system via 10 kV substations or switching stations. The corresponding relay protective scheme is hard to be available and the actual relay protective scheme has many defects. This article analyses the hardness and defects of present relay protective scheme. It shows that in medium voltage （6～35 kV） system, to open the breakers nearest to the fault point often disagrees with the availableness of the best power supply quality. The scheme should aim to the latter. This article brings forward a new relay protective scheme on this condition. In this scheme, the setting code is easy to determine, and the power supply security is remarkably increased. In addition, this scheme is versatile and needs nearly no invest. Based on analyzing the influences of the capacitance and inductance to the respond of the shunt, the clearance width of the band we choose is six mm. We also considered the effect of heat and electromagne-tism when the pulse current is in action. In the condition that the intensity and the width of the pulse current is up to maximum, the electromotive power and heat stress and temperature change. For the reason that the electromotive power and heat stress are so large, some actions to avoid the shunt from broken are taken This experimental result is approximately accorded with the result of other measure approaches.