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 w

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1

[0035] Such as figure 1 As shown, a high-voltage transformer group operating state real-time acquisition system, including several high voltage transformers, several detection channels and processors.

[0036] Several high voltage transformers constitute a high-voltage transformer group, the acquisition system of the present embodiment monitors real-time data of the operating state of the high voltage transformer group.

[0037] Several detection channels are used to detect the operating state real-time data 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 transmits the detection result to the processor. In this embodiment, several detection channel structures and principles are the same, and therefore, only one way detection channel is only described here. Preferably, the detection passage includes a secondary side voltage co...

Example Embodiment

[0045] Example 2

[0046] The medium loss measurement of the high voltage transformer belongs to high voltage, micro current, small angle precision measurement, high requirements for measurement methods, only capable of effectively reduce errors, measured data can accurately reflect the insulation of the device. In the measurement, noise is an undesirable disturbance signal, which is limited and affecting the sensitivity of the measuring instrument, the white noise and low frequency noise formed by the fine noise, which cannot be eliminated by measures such as shield. In order to reduce the impact of noise on the useful signal, a narrowband filter is often used to filter out the external noise to improve the signal-to-noise ratio of the signal. However, since 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 does not satisfy the requirements of higher filtering noise, and there is a large ...

Example Embodiment

[0059] Example 3

[0060] On the basis of the first embodiment, in order to reduce the error of the system, the present embodiment provides a structure and working principle that reduces the detection error of the secondary side voltage conditioning circuit, specifically, such as figure 2 As shown, the secondary side voltage conditioning circuit includes a capacitance voltage dividing circuit, a voltage follower, a phase amplifier, a zero circuit, and a second A / D converter.

[0061] Capacitive voltage dividing circuit extracts the secondary voltage signal of the high voltage transformer. Preferably, if image 3 As shown, the capacitive voltage dividing circuit includes a capacitor C1, a tonable capacitor C2, a capacitor C3, a resistor R8-R10, a potentiometer RP3, a gas discharge tube Tv1, and a bidirectional diode D2;, a particular, one end of the capacitor C3 inputs high voltage transformers. The secondary voltage signal, the other end of the capacitor C3 is electrically conne...

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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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