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由于大功率电力拖动采掘机组的广泛应用,依据安全条件而具有限制短路电弧容量措施的井下配电网路,已不能满足电气设备正常运行的要求了(因为,当异步电动机起动时有不允许的电压波动,并且在限流电抗器上有大的电能损失)。短路容量限制为50MVA 的规定,近年来已成为有效使用现有采矿机器和研制新型高效采矿机器的阻碍。
Due to the extensive application of high power electric drive mining units, the underground distribution network with limited short circuit arc capacity measures according to the safety conditions can no longer meet the requirements of normal operation of electrical equipment (because asynchronous motors are not allowed to start up Of the voltage fluctuations, and the current limiting reactor has a large power loss). The requirement that the short-circuit capacity be limited to 50 MVA has become an impediment to the effective use of existing mining machines and the development of new and efficient mining machines in recent years.