Phase conversion industrial plug refers to an industrial plug that can change the phase sequence of a three-phase power supply without the need for disassembly, also known as a inverter or phase conversion plug. This type of industrial plug and socket is referred to as a inverter in the international standard GB/T 11918-11919-2001. It refers to a plug or appliance input socket with an operating mechanism that can change the position of these pins without the need for two pins to be disconnected.
The characteristic of phase conversion industrial plugs is that after plugging in the power, if the phase sequence is found to be incorrect or needs to be changed, as long as the one hole of the commutation component inside the plug is twisted, the commutation is immediately completed. The operation is simple and very convenient. The commutation plug is mainly suitable for devices that require certification of power phase sequence. Therefore, it is mainly used for the power connection of mobile devices with three-phase motors or mobile maintenance power boxes, which can timely correct phase sequence.
Its specifications include: rated current 16A and 32A, rated voltage 380V, frequency 50Hz, four pole or five pole, splash proof (IP44) or immersion proof (IP67) plug.
1、 Components
The basic structure of a commutation plug is the same as that of a plug, consisting of an outer shell, a pin, a pin holder, a pin cover, a cable rack, screws, a cable sleeve, etc. The key is that there is an additional commutation component in the socket holder.
The commutation component consists of a commutation seat, seat cover, commutation top rod, spring, positioning block, screw, and two phase pole pins.
2、 Commutation principle
The commutation component is clamped into the circular hole in the pin seat and pin cover, and the positioning block is locked in the positioning hole of the pin cover by the spring force. When switching phases, it is necessary to insert a flat headed screwdriver into the flat hole of the commutation top rod, lift the positioning block out of the positioning hole, and unlock it. Rotate 180 ° to swap the positions of the two pins, relying on the spring force, the positioning block is inserted back into the positioning hole and locked. Pull out the screwdriver and the plug commutation work is completed.
The commutation seat is circular and can rotate when installed in the pin seat. The design of the commutation component can only rotate 180 °, so it will not cause the wires to be twisted together or short circuited. There are two holes on the seat cover for two phase wires to pass through and connect to the terminals of the plug.
In addition to the commutation plug, there is also a commutation tool input socket with a similar structure, which has the same specifications as the commutation plug and is equipped with the same commutation component inside the plug socket.