Embedded feeder terminal residual voltage detection circuit

Abstract

The invention discloses an embedded feeder terminal residual voltage detection circuit, which comprises a power supply circuit, a residual voltage signal processing circuit, a comparison circuit, a signal trigger circuit, a telemetry collection circuit and a micropower processor, wherein the output end of the residual voltage signal processing circuit is respectively connected with the comparisoncircuit and the remote measurement collection circuit, the comparison circuit is connected with the signal trigger circuit, and the trigger circuit and the residual voltage signal processing circuit are connected with the micropower processor. The problems of mechanical action delay, power supply power-taking time delay and asynchronous mechanical performance are solved, the electronic detection circuit is stable and reliable, the anti-interference capability is extremely high, and the purposes that the feeder terminal effectively detects residual voltage in a short time and quickly isolates faults are achieved.

Description

technical field [0001] The invention relates to the technical field of distribution network feeder terminals, in particular to an embedded feeder terminal residual voltage detection circuit. Background technique [0002] With the development of the economy, the reliability and safety requirements of the power grid are getting higher and higher. How to improve the reliability of power supply has become the key to the feeder terminal. The recloser-type feeder automation feeder terminal adopts double-sided PT power supply, and reduces the power failure area area of ​​the line through the principle of "connection when power is received, release without voltage" (voltage-time logic), so the feeder terminal of the section or connection needs to collect The voltage is used as a criterion to implement the protection logic and reduce the area of ​​the line power outage. Before the line is powered on, the feeder terminal is in a power-off and non-operating state. During the power tran...

AI Technical Summary

Problems solved by technology

The recloser-type feeder automation feeder terminal adopts double-sided PT power supply, and reduces the power failure area area of ​​the line through the principle of "connection when power is received, release without voltage" (voltage-time logic), so the feeder terminal of the section or connection needs to collect The voltage is used as a criterion to implement the protection logic and reduce the area of ​​the line power outage. Before the line is powered on, the feeder terminal is in a power-off and non-operating state. During the power transmission process, if there is a fault in the line, the recloser at the outlet of the substation It will perform quick-break protection action tripping, and the switch at the outlet of the substation can be tripped within 100ms, and the start-up time of the segment or contact feeder terminal behind the main line is much longer than 100 milliseconds, causing the segment or contact feeder terminal to start in a short time It is impossible to detect the change of the voltage inside, and the corresponding protection action cannot be taken immediately. The fault point can only be gradually isolated in the process of repeated reclosing through the recloser at the outlet of the substation. This causes the fault current to impact the substation many times, and cannot Quickly judge the point of failure, reducing the reliability of power supply

[0003] Although most of the residual voltage detection uses the electromagnetic relay detection method, the relay still has problems such as mechanical action time synchronization, action delay, and residual voltage missing detection.

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