A parallel AC high-voltage line voltage measuring device and method

Abstract

The invention provides a parallel-connected AC high-voltage line voltage measuring device and method. The measuring device includes a high-voltage conductor, a metal tank body, a metal induction sheet and a measuring assembly. The invention realizes the parallel connection of the high-voltage conductor and the AC high-voltage line, and the disassembly can be realized only by disconnecting the AC high-voltage line from the high-voltage conductor. Moreover, the metal tank body of the present invention is grounded, and the metal induction piece is at a low potential, which overcomes the technology that the metal shell in the existing slice-type voltage measuring device is at a high potential, and the live replacement and offline calibration of the sensing part (measuring resistance) cannot be performed. Defects, the live replacement and offline calibration of the sensing part (measurement resistance) are realized, the accuracy of the measurement is improved, and the transmission of the signal detected by the measurement component can be realized through the transmission cable, without the need for photoelectric conversion modules and optical fibers for transmission, which saves cost.

Description

technical field [0001] The invention relates to the technical field of high-voltage line measurement, in particular to a parallel-connected AC high-voltage line voltage measuring device and method. Background technique [0002] In the power system, voltage and current are generally used to represent the operating state of the power grid. Therefore, accurate measurement of equipment voltage and current is of great significance for operation and maintenance personnel to judge the safety status of the power grid and for the stable operation of the power grid. With the deepening of my country's "strong and smart grid" construction, the demand for accurate measurement of overhead line power frequency voltage is becoming more and more urgent. [0003] At present, the voltage measurement in the power system is mainly realized by the voltage transformer, and the traditional transformer is bulky, it is difficult to move once it is fixed, and it can only detect the voltage at a fixed ...

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Problems solved by technology

[0003] At present, the voltage measurement in the power system is mainly realized by the voltage transformer, and the traditional transformer is bulky, it is difficult to move once it is fixed, and it can only detect the voltage at a fixed point. The installation process often needs to be carried out under the condition of power failure. As a sensing component, the core is expensive, and a large number of uses may cause ferromagnetic resonance and other unfavorable factors, making it difficult to measure the voltage of high-voltage transmission lines in areas that are relatively restricted by terrain

In the prior art, the slice-type voltage measuring device on the high-voltage bus suitable for measuring the power frequency voltage of the AIS substation bus is connected in series with the bus, and it is at a high potential. Live replacement and offline calibration affect the accuracy of measurement

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