Low-voltage AC looped network loop power supply monitoring method

Abstract

The invention provides a low-voltage AC looped network loop power supply monitoring method. A low-voltage AC looped network power supply monitoring and spare power device is additionally arranged in an AC looped network; two low-voltage relays, one intermediate relay and one AC contactor are additionally arranged at the two sides of the AC looped network loop respectively, and a low-voltage AC looped network loop voltage loss monitoring signal loop is additionally arranged on a measurement and control device and a background signal is monitored so that real-time monitoring of the low-voltage looped network loop is realized in operation, a spare power supply is automatically powered on when voltage loss or abnormality occurs in an AC looped network power supply, and a corresponding signal is also transmitted immediately. Advantages of the low-voltage AC looped network loop power supply monitoring method are that the spare power supply is automatically powered on when loss of the low-voltage AC looped network power supply of a transformer substation occurs, the fault signal is also transmitted, and an operator on duty can immediately discover and determine fault range according to the background machine signal so that fault processing time of the operator and time of power loss of the looped network power supply can be shortened, and safe and reliable operation capacity of equipment can be enhanced and guaranteed.

Description

technical field [0001] The invention relates to the field of power circuits, in particular to a method for monitoring the power of a low-voltage AC ring network circuit. Background technique [0002] At present, the low-voltage AC ring network power supply of the substation is controlled manually by the AC air switch. The two power sources are operated in one way and the other in standby mode. There is no signal monitoring circuit and power backup device installed. During operation, a certain air switch often trips due to various reasons. Since there is no AC ring network power supply monitoring signal and power backup device, it can only be used when the operator is patrolling or the equipment sends out an abnormal signal, such as when the switch is suppressed overtime, etc. , otherwise it is impossible to judge whether the ring network power supply is good, causing the switch to be unable to press normally and the heater to lose power in winter. At present, the substation ...

AI Technical Summary

Problems solved by technology

During operation, a certain air switch often trips due to various reasons. Since there is no AC ring network power supply monitoring signal and power backup device, it can only be used when the operator is patrolling or the equipment sends out an abnormal signal, such as when the switch is suppressed overtime, etc. , otherwise it is impossible to judge whether the ring network power supply is good, resulting in the switch not being able to press normally and the heater losing power in winter. At present, the substation has gradually realized unattended, and the number of inspections of the substation has also been reduced accordingly, so it is more difficult to find the above problems

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