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三相电源的相序在工农业生产中具有重要意义。许多场合下,是不允许出现逆向相序的,如水泵电机,大型空调器用非往复式压缩机和风机,移动供配电装置等。偶尔出现的逆向相序,将导致事故的发生。 相序指示器只能指示相序的顺向和逆向,无法在逆向相序出现时,对三相电机提供保护。相序保护器进了一步,在逆向相序出现时,能及时切断电源,保护作用是实施了,却不能不中断一段时间去改变相序。 那末,能不能设计一种装置,不论三相电源是顺向还是逆向,它都能保证三相电源以顺向的固定模式输向电机,既保护电机不出现逆向运转,又能避免花费时间去改换相序接线,保证电机供电后一次性投入正常运行呢?
The phase sequence of three-phase power is of great significance in industrial and agricultural production. In many cases, the reverse phase sequence is not allowed, such as pump motors, non-reciprocating compressors and fans for large air conditioners, mobile power distribution devices, and the like. Occasional reverse phase sequence will lead to the accident. Phase sequence indicator can only indicate the forward and reverse phase sequence, can not appear in the reverse phase sequence, to provide protection for three-phase motor. Phase sequence protector to go one step further, in the reverse phase sequence appears, can cut off the power in time, the protection is implemented, but can not be interrupted for some time to change the phase sequence. Then, can design a device, whether the three-phase power supply is forward or reverse, it can ensure that the three-phase power supply to the motor in a forward fixed mode, both to prevent the motor does not appear reverse operation, but also to avoid spending time Change the phase sequence wiring, to ensure that the motor power once put into normal operation?