On-line monitor for partial discharge fault of dry type air reactor based on high-frequency signal

Abstract

The invention discloses an on-line monitor for partial discharge faults of a dry type air reactor based on high-frequency signals. The on-line monitor comprises a fault signal detection unit, a frontamplification unit, a peak value maintaining unit and a data acquisition processing unit, wherein the fault signal detection unit comprises two fault signal monitoring terminals; the front amplification unit comprises operation amplifiers A1 and A2; the peak value maintaining unit comprises operation amplifiers A3 and A4; output ends of the operation amplifiers A1 and A2 are connected with the reverse input end of the operation amplifier A3 and the same-direction input end of the operation amplifier A4; the same-direction input end of the operation amplifier A3 and the reverse input end of theoperation amplifier A4 are grounded; output ends of the operation amplifiers A3 and A4 are connected with the data acquisition processing unit; a diode D1 is connected with the ground through a capacitor C1. By adopting the on-line monitor, faults such as turn-to-turn short circuits or turn-to-turn partial discharge of an electric reactor can be directly detected, and health states of the electric reactor in operation can be monitored in real time.

Description

technical field [0001] The invention relates to the field of partial discharge fault monitoring of reactors, in particular to an on-line monitoring instrument for partial discharge faults of dry-type air-core reactors based on high-frequency signals. Background technique [0002] Large dry-type air-core reactors play an indispensable role in reactive power compensation, limiting short-circuit current and suppressing high-order harmonics. However, in the prior art, because the reactor works in a high-voltage environment for a long time, and the current is large, and the heat is significant, the reactor often has a partial discharge fault, and long-term partial discharge is likely to cause insulation damage between turns of the winding, or even a short circuit between turns, ignition and combustion , Winding fusing and other serious faults. Therefore, carrying out on-line detection of partial discharge of dry-type air-core reactors and timely discovering hidden dangers of the...

AI Technical Summary

Problems solved by technology

[0004] The temperature detection method measures the temperature of the reactor through the temperature sensor, so that the fault location of the reactor can be analyzed, but the temperature sensor has the following disadvantages: 1. There is a delay characteristic, and the temperature can only be detected after the fault rises

2. Need a lot of sensors

3. The temperature is also affected by climate, light, wind speed and other factors, so it is not accurate

However, this method has the following disadvantages: 1. It is only applicable to the location of faulty equipment that has exited operation

2. It is greatly affected by the external environment, and the smoke generated is not easy to collect, resulting in inaccuracy and low real-time performance

However, since the current transformer cannot be exactly the same during the manufacturing and installation process, its response to the fault signal is also different, which affects the accurate detection of faults and the cost is high.

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