Two-way power supply system automatic conversion power supply system circuit diagram

Two-way power supply systems generally have manual switching control. However, due to the harsh climate in the mountains, power outages occur from time to time, and the personnel on duty are more than 100 meters away from the power supply room. When a certain power supply line suddenly stops, the manual power-down time will be long and the labor intensity will be high. Large, the TV transmitter and three sets of FM radio transmitters in the computer room were stopped, affecting the broadcast. This automatic power swapping device can automatically switch the power supply within 1/10s when a certain mains power supply suddenly fails, so that the normal broadcast quality is not affected. The entire device cooperates with the power voltage stabilizer (250KVA). Only two 200A AC contactors are needed on the original switchboard. The economic benefits are obvious. After the device is adopted, the power supply and broadcast quality of the computer room are greatly improved. 1. When the power supply starts, the three-phase knife switch KM opens and KP closes. The normally closed contact of the AC contactor CJM energizes the AC contactor CJP. The main contact CJP1 closes and is powered by external power 1. At this time, the normally closed contact of CJP Contact CJP2 is disconnected, then closed KM, external power 2 waits. 2. When the external power supply 1 suddenly loses power, CJP loses power, its main contact CJP1 is open, the auxiliary contact CJP2 is closed, CJM is powered, the main contact CJM1 is closed, and is powered by the external power 2. At this time, the normally closed contact CJM2 is open On, wait after external power 1 is restored. 3. When manual power supply conversion requires a certain mains supply, you only need to open the other switch, and external power 1 and external power 2 are manually switched. 4.KP and KM are 600A three-phase knife switches, and CJP and CJM are 200A AC contactors.