Automatic generator set and grid power supply switching program control device

Abstract

The invention relates to an automatic generator set and grid power supply switching program control device which is high in electromagnetic interference resistance, long-term work stability and switching speed and comprises three phases of power sources a, b and c of a generator set F and three phases of power sources A, B and C for grid power supply G. The power source a of the generator set is connected to one end of a normally closed contact A6 of a grid testing intermediate relay CA after passing a power supply air switch DK2 of the generator set, the other end of the normally closed contact A6 of the grid testing intermediate relay CA is connected with one end of a generator testing intermediate relay CB, the other end of the generator testing intermediate relay CB is connected with the power source c of the generator set, and the other end of the generator testing intermediate relay CB is connected with an end of an auxiliary normally closed contact 1KM<1> of a grid power supply switching alternating-current contactor KM<1>. The automatic generator set and grid power supply switching program control device has the advantages that the automatic generator set and grid power supply switching program control device is simple in structure and low in manufacturing cost, is economical and conforms to national conditions of China.

Description

technical field [0001] The invention relates to a program-controlled device for automatic switching between a generating set and a grid power supply, and belongs to the field of electronic technology. Background technique [0002] In daily production and life, there are many important equipment or departments whose power supply is prohibited to be interrupted, and their power consumption must be guaranteed to be continuous and very safe and reliable. [0003] The working principle of the program-controlled device for automatically switching between the generator set and the grid power supply is: when the grid power supply is normal, the load is normally powered by the grid; The system automatically restores power to the grid. [0004] The current program-controlled devices for automatic switching between generator sets and grid power supply have poor anti-electromagnetic interference performance, poor long-term working stability, and are prone to failures, which seriously a...

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Problems solved by technology

[0004] The current program-controlled devices for automatic switching between generator sets and grid power supply have poor anti-electromagnetic interference performance, poor long-term working stability, and are prone to failures, which seriously affect the normal operation of production and life; There are few faults, but the structure is often complicated and the cost is high, which does not meet the national conditions of our country; in addition, the current automatic switch between the generator set and the grid power supply program-controlled device has a slow conversion speed, generally 1s-3s

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