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Device and method for measuring high voltage of electric power system

A technology of power system and measuring device, which is applied in the field of high voltage measuring device of power system, can solve the problems of high cost and high insulation level, and achieve the effect of low cost, low insulation level and cost reduction

Active Publication Date: 2014-04-02
CHINA THREE GORGES UNIV
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Problems solved by technology

[0006] In order to solve the defects of high insulation level and high cost of existing voltage transformers

Method used

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  • Device and method for measuring high voltage of electric power system
  • Device and method for measuring high voltage of electric power system
  • Device and method for measuring high voltage of electric power system

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Embodiment Construction

[0022] A high-voltage measuring device and method for a power system, which linearly calculates the actual voltage of a high-voltage live conductor by measuring the tail voltage of an insulator string 4, thereby realizing indirect measurement of the high voltage of a power system. The method comprises a measuring device 1, the measuring device 1 comprises sequentially connected: a voltage divider and a calibration circuit, a sample-and-hold circuit, an A / D conversion circuit, a central processing unit, a communication interface circuit, and the measuring device 1 passes through a coaxial cable 2 The core wire is connected to the tail piece 3 of the insulator string 4 to measure the tail voltage of the insulator string 4 , and the shielded wire of the coaxial cable 2 is directly connected to the tower 6 . The core wire of the coaxial cable 2 and the tail piece 3 can be bonded by superglue, and can also be directly connected with a special insulator with a joint. The high-voltag...

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Abstract

The invention discloses a device and a method for measuring high voltage of an electric power system. The tail voltage of an insulator chain is measured, and the actual voltage of a high-voltage charged conductor is linearly calculated, so that the high voltage of the electric power system is indirectly measured. The method adopts a measuring device; the measuring device comprises a voltage division and calibration circuit, a sampling hold circuit, an analog / digital (A / D) conversion circuit, a central processing unit and a communication interface circuit which are connected in sequence. The measuring device is connected to a tail plate of the insulator chain through a core wire of a coaxial cable, the tail voltage of the insulator chain is measured, and a shielded wire of the coaxial cable is directly connected with a tower. According to the device and the method for measuring the high voltage of the electric power system, the tail voltage of the insulator chain is measured, the insulation level of the device is greatly reduced, and the size and the construction cost of the device are greatly reduced; meanwhile, major failures and hidden risks during operation of the electric power system are eliminated, and personnel and equipment safety is guaranteed.

Description

technical field [0001] The invention relates to a power system high voltage measurement device and method, and relates to the field of power system high voltage measurement. Background technique [0002] The function of the voltage transformer is to transform the high voltage of the power into a standard secondary voltage of 100V or lower in proportion to the secondary device for protection, metering, and instrumentation. At the same time, the use of voltage transformers can isolate high voltage from electrical workers and secondary equipment. According to the principle of voltage conversion, it can be divided into three categories: electromagnetic type, capacitive type and photoelectric type. [0003] Electromagnetic voltage transformer transforms voltage according to the principle of electromagnetic induction. The principle is completely similar to the basic structure and transformer. It is mainly composed of primary and secondary coils, iron core and insulation. When a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
Inventor 王成江
Owner CHINA THREE GORGES UNIV
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