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High-voltage transformer group operation state real-time acquisition system

A high-voltage transformer and operating state technology, applied in instruments, radio-controlled timers, measuring devices, etc., can solve the problems of long maintenance cycle, heavy workload, and inability to reasonably allocate maintenance resources, and achieve improved processing accuracy, The effect of reducing errors and strong anti-interference ability

Pending Publication Date: 2021-03-19
STATE GRID HUBEI MARKETING SERVICE CENT (MEASUREMENT CENT)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main method for CVT state detection is the power failure maintenance mode. This mode inevitably needs to stop the power supply, and the workload is large, and the maintenance cycle is long. Unable to truly judge the status of the CVT, and often maintenance resources cannot be reasonably allocated

Method used

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  • High-voltage transformer group operation state real-time acquisition system
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  • High-voltage transformer group operation state real-time acquisition system

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Embodiment 1

[0035] Such as figure 1 As shown, a real-time acquisition system for the operation status of a high-voltage transformer group of the present invention includes several high-voltage transformers, several detection channels and a processor.

[0036] Several high-voltage transformers form a high-voltage transformer group, and the acquisition system in this embodiment monitors the real-time data of the operation status of the high-voltage transformer group.

[0037] Several detection channels are used to detect the real-time data of the operating status of each high-voltage transformer group in the high-voltage transformer group, and one detection channel detects the secondary side voltage and current of a high-voltage transformer, and sends the detection results to the processor. In this embodiment, the structures and principles of several detection channels are the same, therefore, only one of the detection channels is introduced here. Preferably, the detection channel includes...

Embodiment 2

[0046] The dielectric loss measurement of high-voltage transformers belongs to the precision measurement of high voltage, micro current and small angle, which requires high measurement methods. Only when the error can be effectively reduced can the measured data accurately reflect the insulation status of the equipment. In measurement, noise is an undesired disturbing signal, which limits and affects the sensitivity of measuring instruments, white noise and low-frequency noise formed by fine noise, and these noises cannot be eliminated by shielding and other measures. In order to reduce the impact of noise on useful signals, narrowband filters are commonly used to filter out-of-band noise to improve the signal-to-noise ratio. However, because the center frequency of the general filter is unstable and its bandwidth is related to the center frequency and the Q value of the filter, it cannot meet the higher requirements for filtering noise, and there are large errors, resulting in...

Embodiment 3

[0060] On the basis of Embodiment 1, in order to reduce the error of the system, this embodiment provides a structure and working principle for reducing the detection error of the secondary side voltage conditioning circuit, specifically, as figure 2 As shown, the secondary side voltage conditioning circuit includes a capacitive voltage divider circuit, a voltage follower, a non-inverting amplifier, a zeroing circuit and a second A / D converter.

[0061] The capacitive voltage divider circuit extracts the secondary voltage signal of the high voltage transformer. preferred, such as image 3 As shown, the capacitor voltage divider circuit includes capacitor C1, adjustable capacitor C2, capacitor C3, resistors R8-R10, potentiometer RP3, gas discharge tube TV1 and bidirectional transient diode D2; specifically, one end of capacitor C3 is input into the high voltage transformer Secondary voltage signal, the other end of capacitor C3 is electrically connected to one end of capacito...

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Abstract

The invention provides a high-voltage transformer group operation state real-time acquisition system, which obtains the dielectric loss of a high-voltage transformer based on the secondary side voltage and leakage current of the high-voltage transformer, and performs mutual verification on the pressure, humidity and temperature data and the dielectric loss analyzed based on the secondary side voltage and leakage current. The fault monitoring reliability of the system is enhanced; compared with the traditional ultrasonic partial discharge detection method, the method for detecting the leakage current at the tail end of the equipment by adopting the micro-current sensor has the advantages that the anti-interference capability is stronger, useful signals can be extracted from noise, and the error of system detection is reduced.

Description

technical field [0001] The invention relates to the technical field of high-voltage transformer group detection, in particular to a real-time acquisition system for the running state of a high-voltage transformer group. Background technique [0002] The high-voltage transformer group is used to measure the large current and high voltage of the power system, providing the most basic and important measurement data for the power grid. Capacitor Voltage Transformer (CVT) is an important metering and protection device in the power system, and its safe and stable operation is directly related to the stability of power grid operation and the accuracy of electric energy metering. [0003] At present, the main method for CVT state detection is the power failure maintenance mode. This mode inevitably needs to stop the power supply, and the workload is large, and the maintenance cycle is long. It is impossible to truly judge the state of the CVT, and often the maintenance resources ca...

Claims

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Application Information

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IPC IPC(8): G01R35/02G01D21/02G04R20/02
CPCG01R35/02G01D21/02G04R20/02
Inventor 明东岳鄢烈奇唐登平李俊姚鹏石洪李帆刘莉荣先金王华郭正陈辉吕馥香王尚鹏夏天李君
Owner STATE GRID HUBEI MARKETING SERVICE CENT (MEASUREMENT CENT)
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