Dual power switches (referred to as dual power supplies) are mainly composed of molded case circuit breaker (CB class) or isolating switch (PC class) components. The purpose of the dual power automatic transfer switch is, in simple terms, all the way to use one standby. When the common power suddenly fails or fails, it is automatically put into the standby power supply through the dual power switch. (The standby power can also be powered by the generator under small load. ,) Make the device still operate normally. The most common ones are elevators, fire protection, and monitoring. The bank also uses UPS uninterruptible power supplies, but his spare is a battery pack. Some factories, mines or units that have a type of load and a second type of load mostly have it!
Operating procedures:
1. When the power is cut off for any reason and the power supply cannot be restored within a short time, the standby power must be enabled.
step:
1 Cut off the mains-powered circuit breakers (including the circuit breakers of the power distribution room control cabinet, the power supply breakers of the dual power supply switch box), pull the double-cast anti-return switch to the side of the self-contained power supply, and maintain the dual power supply switching box The self-powered circuit breaker is in the disconnected state.
2 Start the standby power supply (diesel generator set). When the standby group is running normally, close the generator air switch and the breakers in the power supply control cabinet.
3 Close the power switch breakers in the power switch box one by one and send power to each load.
4 During the operation of backup power supply, the operator on duty should not leave the generator set, and timely adjust the voltage, plant frequency, etc. according to the change of the load, and find that the abnormality is handled in time.
2. When the utility power is restored to power supply, the power conversion work should be completed in time, and the standby power supply should be cut off to restore the power supply of the mains.
1 The breakers of the self-supplied power supply are disconnected one by one in turn, in this order: dual power supply switching box-owned power supply circuit breakers → self-powered power distribution cabinet circuit breakers → generator master switch → switching the dual-input switch to the mains supply One side.
2 Press the diesel engine shutdown step to stop.
3 In sequence, the circuit breakers are closed one by one from the mains power supply main switch to the dual power switch box from the mains power supply circuit breaker to the closed position.
3, check the indicator and indicator light is normal, start the transformer cooling fan.
Operating procedures:
1. When the power is cut off for any reason and the power supply cannot be restored within a short time, the standby power must be enabled.
step:
1 Cut off the mains-powered circuit breakers (including the circuit breakers of the power distribution room control cabinet, the power supply breakers of the dual power supply switch box), pull the double-cast anti-return switch to the side of the self-contained power supply, and maintain the dual power supply switching box The self-powered circuit breaker is in the disconnected state.
2 Start the standby power supply (diesel generator set). When the standby group is running normally, close the generator air switch and the breakers in the power supply control cabinet.
3 Close the power switch breakers in the power switch box one by one and send power to each load.
4 During the operation of backup power supply, the operator on duty should not leave the generator set, and timely adjust the voltage, plant frequency, etc. according to the change of the load, and find that the abnormality is handled in time.
2. When the utility power is restored to power supply, the power conversion work should be completed in time, and the standby power supply should be cut off to restore the power supply of the mains.
1 The breakers of the self-supplied power supply are disconnected one by one in turn, in this order: dual power supply switching box-owned power supply circuit breakers → self-powered power distribution cabinet circuit breakers → generator master switch → switching the dual-input switch to the mains supply One side.
2 Press the diesel engine shutdown step to stop.
3 In sequence, the circuit breakers are closed one by one from the mains power supply main switch to the dual power switch box from the mains power supply circuit breaker to the closed position.
3, check the indicator and indicator light is normal, start the transformer cooling fan.
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