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Fault Indicator Monitoring System Timely To Provide Faulty Problems In A Timely Manner

Fault Indicator Monitoring System With the development of infrastructure in China over the past two decades, the corresponding construction of distribution network has made great progress. The scale of distribution network has been expanding and the structure has been improved day by day. According to estimates, when a region of power supply reliability reached 99%, relying on improving the structure of the grid to improve the reliability of power supply will be less effective, to further improve the reliability of distribution network to more than 99.99%, must rely on distribution automation system to achieve The

Power distribution automation as an important part of the modern distribution network management system, is to achieve the necessary conditions for intelligent distribution network, is to improve the reliability of power supply and operation and management of effective means. Distribution automation construction has become the focus of the development of China's distribution network. In the national "thirteen five" plan clearly put forward the next five years, the goal of China's power distribution automation, the power distribution industry is expected to usher in a new investment climax.

The Fault Indicator Monitoring System is an important equipment that can judge, detect and locate the fault of the grid according to the change of the current and voltage in the power line. It is usually installed in the power transmission network, mainly used to monitor the detection line may occur short circuit and single-phase ground fault, when the power network short circuit phenomenon occurs, the current value of the line instantaneous mutation, the fault current The flop or flash action of the indicator is touched when passing the indicator, and the fault current does not affect its normal display. At the same time fault indicators are equipped with automatic delay reset function, when troubleshooting, restore power transmission, the fault indicator will automatically reset for the next test to prepare, which makes the daily inspection and maintenance of the grid more convenient.

At present, the most likely to occur in the power network transmission is the interphase short circuit and the single phase ground fault. Therefore, the design of the fault indicator is set according to these two types of faults. Phase short circuit refers to the transmission line of the two-phase or three-phase contact between each other, resulting in a short circuit fault occurred. When the phase short circuit occurs,Fault Indicator Monitoring System the instantaneous current in the line suddenly increases, and the formation of current jump, fault indicator internal current mutation value is set, if the current change exceeds the set value, then the indicator will display Corresponding fault signal. For the single-phase ground to determine the basis and principle of the most commonly used is the zero sequence current amplitude method, that is, the neutral point is not directly connected to the distribution network to collect temporary current, voltage and other data values, and then use steady-state zero sequence Current and voltage of the fundamental or high harmonics of the collected data to calculate and analyze, so the line in the current and voltage values to determine, if the fault current is displayed flop or light, otherwise the indicator no change.