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Capacitive voltage transformer electrified detector

A technology of voltage transformers and detectors, which is applied in the direction of instruments, measuring electronics, and measuring devices, which can solve the problems of unsatisfactory overall test results, high secondary maintenance costs, and large primary investment, etc., and achieve light weight, convenient and safe wiring , simple operation effect

Inactive Publication Date: 2014-09-10
STATE GRID CORP OF CHINA +1
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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 electrified detector
  • Capacitive voltage transformer electrified detector
  • Capacitive voltage transformer electrified detector

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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) electrified detector which comprises a current unit, a voltage unit and a laptop. The voltage unit is used for measuring the voltage UMW of a bus PT of the CVT. The current unit is used for measuring the voltage UCVT of the measuring end of the CVT, the current IC2 flowing through C2 and the current IT flowing through a middle transformer of the CVT. Power failure operation and earlier-stage modification work of any form are not required to be conducted on CVT devices in a transformer substation. A high-accuracy pincer-like current transformer is utilized, wiring is convenient and safe, and normal operation of the CVT devices to be detected is not affected during work. Various parameters of the CVT devices to be detected can be provided, multi-parameter evaluation can be conducted on the whole operation state of the CVT, and a special CVT state evaluation system is provided.

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 Applications(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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