Voltage measurement device for high-voltage direct-current power transmission valve assembly

Abstract

The invention belongs to the technical field of measurement and test, and particularly relates to a voltage measurement device for a high-voltage direct-current power transmission valve assembly. The measurement device comprises an upper circular plate electrode, a high-voltage arm resistor, a lower circular plate electrode and a low-voltage arm which are connected in turn from the top to the bottom; the upper circular plate electrode, the high-voltage arm resistor and the lower circular plate electrode form a transverse H-shaped symmetrical circular plate electrode structure; space capacitors between the high-voltage arm resistor and the upper and lower circular plate electrodes are taken as high-voltage arm capacitors; the upper end of the high-voltage arm resistor is provided with a high-voltage lead end, while the lower end is sleeved with an insulating cushion cover; and the lower circular plate electrode is in insulated connection with the high-voltage arm resistor through the insulating cushion cover. The measurement device has the advantages of small volume, high reliability, good stability, simple and convenient maintenance and the like; the measurement range of the measurement device can reach + / -50kV, the frequency band is 0 to 10MHz, the actually measured partial pressure ratio is 33,464: 1, and the maximum measurement error is 2.48 percent; and the measurement device can fully meet the measurement requirement of converter valve test.

Description

technical field [0001] The invention belongs to the technical field of measurement and testing, and in particular relates to a voltage measuring device for a high-voltage direct current transmission valve assembly. Background technique [0002] The HVDC converter valve is composed of multiple valve components and reactors connected in series, and each valve component is composed of 5 to 7 thyristors connected in series and press-fitted. At the same time, there is an RC protection circuit at both ends of each thyristor, and the structure is very complicated. Since the converter valve is a hoisting structure, the voltage on each component is easily affected by stray parameters between layers and between layers, resulting in uneven voltage distribution on each component, and the valve components near the high-voltage end will accelerate aging due to excessive voltage. Causing damage to the entire diverter valve. When performing overvoltage tests such as lightning impulse, oper...

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Problems solved by technology

However, since the high-voltage arm in this device is an oil-immersed structure, there will be defects such as easy oil leakage, difficult maintenance, and large volume. The voltage distribution on the high-voltage arm is still uneven, and the voltage distribution on the high-voltage arm is as follows: image 3 shown

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