Research On Emergency Device Of DC Power Supply In Substation

Substation DC power supply is the basis of power system control and protection,it works as a power source of signal device and automatic device.When the AC power supply of substation is missing,the DC power supply can be used as an independent emergency standby power supply,the reliability of the DC power supply system for the substation affects the safety and stable operation of the substation directly.Therefore,people pay more and more attention to the research of DC system in substation.At present,all 110 kV and the following substation DC system is only set by a set of batteries in Hongze county.When the DC system is wrong or check and repair the battery,DC switching bus will lose the power.At this time,if the the power grid appears accident.the circuit breaker can not close normally because of no power which will cause the power collapse of substation.Therefore,it has important engineering value and economic significance to study the emergency device of DC power supply.The main research contents of this thesis can be summarized as follows:(1)The design principle and design scheme of the DC power supply emergency device at home and abroad is analyzed and studied in this thesis.and the theoretical basis of the DC power supply emergency device used in this thesis is summarized.(2)According to the relevant theory.the overall structure of the emergency device is designed.and the specific design of each subsystem is designed.The function and reliability of the emergency device of DC power supply are evaluated by the scientific test method of the system test and the whole test in this thesis.(3)Based on the operation of detection of the DC emergency device in a substation in our province.and the reliability and economy of the unit is studied and evaluated.The result shows that the application of the device can improve the emergency response of various anomalies and accidents in DC system of substation effectively,shorten the time of power outage and ensure the safety and stable operation of the substation.and it can make the annual maintenance cost of the DC system reduce 22500 yuan which has a large economic value.