Circuit for measuring spot impedance of dry type air reactor and detection method

Abstract

The invention discloses a circuit for measuring spot impedance of dry type air reactors and a detection method. During spot detection, due to the fact that other operation reactors around a tested reactor work, and relatively large power frequency induction current is generated in the tested reactor, the current flowing through the reactors is sum of the power frequency induction current and applied detection current. The circuit comprises a current transformer unit (1), wherein the current transformer unit (1) is connected with a voltage and current signal acquisition unit (2); the voltage and current signal acquisition unit is connected with a resistance voltage divider (3); the resistance voltage divider is connected with the tested reactor (4) in parallel; an inductor L3 and a capacitor C1 are connected in series and then connected with two ends of the tested reactor in parallel; the inductor L3 is connected with a protection resistor R4; the protection resistor is connected with an isolation transformer; the isolation transformer is connected with a medium-frequency power supply; and the tested reactor is connected with a surrounding operation reactor (6) through a mutual inductor M12. The circuit is used for the spot measurement of impedance of dry type air reactors.

Description

[0001] Technical field: [0002] The invention relates to a dry-type air-core reactor on-site impedance measurement circuit and a detection method. [0003] Background technique: [0004] With the gradual development of the power grid in the direction of "large capacity, long distance, ultra-high voltage, and ultra-high voltage", it is particularly important to ensure the safe and stable operation of the power grid. Reactors can play the role of compensating reactive power, limiting short-circuit current, filtering high-order harmonics, etc., and are currently widely used in power grids. The impedance parameter of the reactor is an important index to measure the quality of the reactor, and it is of great significance to effectively measure the impedance of the reactor. [0005] The impedance measurement methods for reactors are mainly DC resistance measurement method and power frequency measurement method. The DC resistance measurement method can only measure the resistance o...

AI Technical Summary

Problems solved by technology

The DC resistance measurement method can only measure the resistance of the reactor, and cannot measure the reactance of the reactor

However, the power frequency detection method will be affected by the power frequency interference at the test site, so that the frequency of the measurement signal and the power frequency induction signal are the same, and it is difficult to distinguish between the two superimposed together, which makes this method unable to achieve accurate measurement of the reactor impedance

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