Disco nnecting switch A switching device for cutting high voltage circuits without a special arc extinguishing device. It can not break the load current and short-circuit current, its contact is exposed in the air, there is a clearly visible segment at the opening state, and the normal working current and short-circuit fault current can be passed in the closing state, which is mainly used to ensure the equipment maintenance work. Safety and switching operations for unloaded circuits.
There are many types of isolation switches. According to different installation locations, it can be divided into indoor type and outdoor type; according to the number of insulation pillars, it can be divided into single column type, double column type and three column type; according to the number of phases, it can be divided into single phase and three phase; Can be divided into with a grounding knife and without a grounding knife, the former after the isolation switch is opened, the grounding knife is closed, in order to carry out line or bus maintenance. The isolating switch can have both manual and electric operating mechanisms.
Operational characteristics and technical parameters Operating experience shows that the isolating switch can be used to open and close voltage transformers, lightning arresters, busbars, and can also be used to break the no-load transformer with excitation current less than 2A and no-load circuit with capacitor current not exceeding 5A.
Operating characteristics In order to prevent the erroneous operation of the isolation switch opening and closing load current and short-circuit current, the operating mechanism with the locking device is usually used to prevent the erroneous operation of the isolating switch, and the operation of the isolating switch is performed in the correct steps. There are two main types of locking devices. 1 secondary circuit blocking. For the electric disconnector, the control circuit often ensures the correctness of the opening and closing operation by adding the circuit breaker position contact. 2 mechanical locking. The simplest and most practical method of locking is to install a mechanical lock on the isolating switch control mechanism.
Technical parameters The technical parameters of the isolating switch are generally marked on the nameplate. There are rated voltage, rated current, limit through current, thermal stable current and so on. The rated voltage and rated current are the basis for the selection of the switch. The limit through current is the basis for the stable calibration of the switch, and the thermal stable current is used as the basis for the thermal stability check of the switch.Brushless Servo Motor Sewing Machine,Servo Motor For Juki Sewing Machine,Brushless Sewing Machine Motor,Brushless Servo Motor For Sewing Machine
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