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BLD—2型高压漏电监视保护装置是首批新研制的千伏级煤矿井下防爆电气设备高压配电装置中的保护单元,它对井下6kV供电系统单相漏电接地故障具有选择性检漏保护性能,并能对6kV UGSP监视型双屏蔽电缆实现监视保护。BLD—3型高压漏电保护装置是BLD—2型的派生产品,它只有选择性的单相检漏保护,其保护原理及线路与前者完全相同。 BLD—3型高压漏电保护装置与LLZ—φ76型零序电流互感器配套成配电屏式的高压漏电保护装置,于77年4月起先后在徐州大黄山煤矿小孤山变电所和抚顺马场变电所投入工业性试运行,并于80年6月经一机部电工总局和煤炭部
BLD-2 high-voltage leakage monitoring and protection device is the first batch of newly developed kilovolt mine explosion-proof electrical equipment in high-voltage power distribution unit protection unit, it underground leakage 6kV power supply system single-phase leakage ground fault with selective leak detection protection , And 6kV UGSP monitoring double shielded cable to achieve monitoring and protection. BLD-3 high-voltage leakage protection device is a derivative of BLD-2 type, it is only selective single-phase leakage detection protection, the protection principle and circuit exactly the same with the former. BLD-3-type high-voltage leakage protection device and LLZ-φ76-type zero-sequence current transformer supporting distribution screen-type high voltage leakage protection device, in April 77 in Xuzhou Huangshan Coal Mine Xiaogushan Substation and Fushun Racecourse substation put into industrial trial operation, and in June 80 by a ministry electrician and the Ministry of Coal