An air-core reactor fault location circuit

Abstract

The invention discloses a fault positioning circuit of a hollow electric reactor. The fault positioning circuit includes: distributed probes, which are used for coupling outwardly radiating high frequency electromagnetic wave signals of a fault point of a hollow electric reactor and transmitting the signals to a signal conditioning module; the signal conditioning module, which extracts the weak high frequency electromagnetic wave signals within a frequency range from 100MHz to 300MHz, and transmits the signals to a precise time delay shaping circuit and a data analysis module after amplifying the signals; the precise time delay shaping circuit, which modulates the transmitted high frequency electromagnetic wave signals into pulse signals with a picosecond level rising edge; and the data analysis module, which analyzes the high frequency electromagnetic wave signals amplified by the signal conditioning module and the pulse signals modulated by the precise time delay shaping circuit, obtains distances between a partial discharge fault point to the distributed probes through calculation, and determines the position of the fault point. Through the above principles, the accuracy of identification of a discharge fault is increased and the specific position of the discharge fault is determined, thereby bringing convenience for fault diagnosis and maintenance for the hollow electric reactor in a later period.

Description

technical field [0001] The invention relates to the field of electric power, in particular to an air-core reactor fault location circuit. Background technique [0002] The pulse current method adopts off-line measurement with high sensitivity, and can be used to correct and quantify the pulse injection with known charge amount, so as to measure the discharge. The electrical signal of partial discharge has a very wide frequency spectrum, ranging from hundreds of joints to hundreds of megahertz. However, the pulse current method in the lower frequency band widely used at present has poor anti-interference ability, and the pulse current method in the high frequency band has a signal-to-noise ratio. high defect. However, the partial discharge energy is mainly concentrated below a few hundred megahertz, and the energy of the UHF part is very weak. The UHF method is difficult to quantify the partial discharge. This method is not sensitive to the discharge detection of the air gap...

AI Technical Summary

Problems solved by technology

The electrical signal of partial discharge has a very wide frequency spectrum, ranging from hundreds of joints to hundreds of megahertz. However, the pulse current method in the lower frequency band widely used at present has poor anti-interference ability, and the pulse current method in the high frequency band has a signal-to-noise ratio. high defect

However, the partial discharge energy is mainly concentrated below a few hundred megahertz, and the energy of the UHF part is very weak. It is difficult to quantify the partial discharge by the UHF method. This method is not sensitive to the discharge detection of the air gap inside the insulation.

At present, in the insulation testing process of air-core reactors, the pulse current method is used to detect the size of the partial discharge to assess the insulation status of the product, but sometimes the insulation defects generated inside the reactor cannot be effectively detected by the pulse current method, resulting in a decrease in measurement sensitivity. Due to the fast propagation speed of the pulse current signal, the distance of the fault point sensor cannot be obtained by using the ordinary positioning circuit, and the discharge position cannot be determined, which brings difficulties to the fault diagnosis and maintenance of the air-core reactor.

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