Capacitive voltage transformer live detector

A voltage transformer and capacitive technology, applied in the field of 220kV capacitive voltage transformer live detectors, can solve the problems of large primary investment, unsatisfactory overall test results, and high secondary maintenance costs, and achieve simple operation and light weight. , The effect of convenient and safe wiring

Inactive Publication Date: 2016-09-07
STATE GRID CORP OF CHINA +1
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AI Technical Summary

Problems solved by technology

[0004] In the last ten years, due to the advancement of computer and sensor technology, people use core-through current transformers to develop an online monitoring system for capacitive equipment. However, this monitoring system needs to change the lead wires of the end screen, which requires a large initial investment and high secondary maintenance costs. , the overall test results are too unsatisfactory

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  • Capacitive voltage transformer live detector
  • Capacitive voltage transformer live detector
  • Capacitive voltage transformer live detector

Examples

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Embodiment Construction

[0019] As shown in the attached figure, the CVT electrification detector includes three parts: current unit, voltage unit and notebook computer, see figure 1 . The shielded network cable is used between the units for signal transmission between the units, the shielded cable is used to power the voltage unit, and the 485 bus and USB to 485 serial port are used to realize the information transmission between the current and voltage units and the computer.

[0020] Voltage unit: used to measure bus PT voltage U MW , U MW After the voltage sensor is amplified and filtered, the reference signal generated by the reference source signal generator is processed by the ADC signal, and the analog signal is converted into a digital signal that can be recognized by the machine, and then input to the microcontroller (MCU) through the field programmable gate array (FPGA) It is stored in the computer, communicates with the current unit through the FPGA and the communication interface, and t...

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Abstract

The invention relates to a 220kV capacitive voltage transformer (CVT) charged detector, comprising a current unit, a voltage unit, and a notebook computer, and the voltage unit is used for measuring the PT voltage U of the CVT bus bar MW , the current unit is used to measure the CVT measuring terminal voltage U CVT , flow through C 2 Current I C2 and the current I flowing through the CVT intermediate transformer T . The present invention does not need to perform any form of power failure operation and preliminary reconstruction work on the CVT equipment in the substation. Using high-precision clamp-type current transformers, the wiring is convenient and safe, and the normal operation of the CVT equipment to be tested will not be affected during operation. It can provide a variety of parameters of the CVT to be tested, and can perform multi-parameter evaluation of the overall operating state of the CVT. It has a professional CVT state evaluation system.

Description

technical field [0001] The invention relates to a 220kV capacitive voltage transformer (CVT) electrification detector, which adopts a high-precision clamp-type current transformer, and does not affect the normal operation of the 220kVCVT equipment to be tested during electrification detection. Background technique [0002] Since 1995, domestic CVT production and sales have grown at an average rate of 25% per year. With the increase in the number of CVTs used, the number of CVT failures is increasing year by year. Therefore, it is very meaningful to improve the detection ability of CVT on-site maintenance. [0003] For the increasingly prominent potential failure of CVT equipment, there is no practical and reliable detection method at present. According to the requirements of the State Grid Corporation of China Q / GDW168-2008 "Condition Maintenance Test Regulations for Power Transmission and Transformation Equipment", currently only visual inspection, infrared thermal image ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 崔志铭刘春伍亚萍蔡冰冰王丹江谢忠干
Owner STATE GRID CORP OF CHINA
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