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DC electric filed detection method of insulator for high-voltage DC transmission line

A technology of DC electric field and transmission line, which is applied in the direction of electrostatic field measurement, measuring electricity, measuring devices, etc. It can solve the problems of large voltage divider error, large dispersion of ball gap breakdown voltage, and inability to measure DC electric field distribution with insulators, etc. , to achieve the effect of simple device, low cost and easy operation

Active Publication Date: 2007-03-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology

These two methods can only be used for laboratory research and cannot be used for the measurement of the DC electric field distribution of insulators on actual lines
And due to the large dispersion of the ball gap breakdown voltage, the voltage divider and the galvanometer lead affect the electric field distribution, and the error is large

Method used

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  • DC electric filed detection method of insulator for high-voltage DC transmission line
  • DC electric filed detection method of insulator for high-voltage DC transmission line
  • DC electric filed detection method of insulator for high-voltage DC transmission line

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Embodiment Construction

[0018] 1 to 3 are an embodiment of the present invention. As shown in Figure 2, the metal plate is a parallel rectangular flat plate (10cm×5cm in size), and the integral circuit is composed of an operational amplifier AD620 and a 1 microfarad capacitor; the integral circuit and its subsequent single-chip microcomputer circuit responsible for recording are placed in a rectangular shielding box Inside, the metal pole plates are placed on both sides of the outside of the shielding box and insulated from the shielding box; the metal pole plates are perpendicular to the axis of the insulator, and the DC electric field component along the axis can be measured. Accompanying drawing 3 has provided the axial DC electric field distribution curve of a 110kV grade composite insulator measured by this implementation method when it bears a DC voltage of 50kV. The ordinate in the figure is the measured axial DC electric field intensity, and the abscissa is The serial number of the shed of th...

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Abstract

This invention relates to high voltage direct current circuit insulator field measurement method, which belongs to power system high voltage output circuit electricity test field and adopts integration circuit and measures the direct current field intensity between two metal conductors induced charge in the measurement space. This invention only transfers the device to the insulator front and slide to fulfill the whole direct charge field distribution measurement.

Description

technical field [0001] The invention belongs to the field of live detection of insulators of high-voltage transmission lines in power systems, and in particular provides a method for measuring the DC electric field of insulators of high-voltage direct-current transmission lines. technical background [0002] my country's ultra-high voltage direct current transmission system, as a channel for the east-to-east transmission of a large amount of hydropower in the west, carries a very large power and usually runs at full load. Once an accident occurs in the direct current system, it will have a great impact on the power grid. After the DC system fails, the frequency of the system will increase due to the inability to transmit a large amount of power; the transfer of a large amount of power will cause serious overloading of some lines, especially the inter-provincial tie lines, which will have a great impact on the safe and stable operation of the entire power grid; the DC system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R31/02G01R29/24G01R29/12
Inventor 程养春李成榕唐志国王伟郑书生
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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