Flat-plate VFTO measuring sensor

A technology for measuring sensors and sensors, applied in measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve problems such as inability to realize online detection of power grids, and inability to ensure airtightness, etc., to reduce electromagnetic interference, flexible design, and convenience Effect of replacement or repair

Active Publication Date: 2010-07-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
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Problems solved by technology

At present, the existing flat VFTO measurement sensor cannot guarantee the airtightness of the GIS when the sensor is removed or installed during actual use. Therefore, when the sensor needs to be installed or removed during replacement or maintenance, the power grid needs to be powered off, and the long-term maintenance of the power grid cannot be achieved. online detection run

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] refer to figure 1 The working principle diagram of the flat VFTO measurement sensor, the working principle of VFTO is the principle of capacitive voltage divider, figure 1 As shown in , 110 is the high-voltage electric equipment to be detected, 120 is the working part of the sensor, and 130 is the detection equipment. The working part 120 of the sensor includes: a capacitor C1 of the high voltage arm, a capacitor C2 of the low voltage arm and a matching resistor R. The detection device 130 is used to detect the voltage of the capacitor C2 of the low voltage arm. In the working part 120 of the sensor, one end of the low-voltage arm capacitor C2 is grounded, and the other end is connected in series with the high-voltage arm capacitor C1. lead out, and the o...

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Abstract

The invention discloses a flat-plate VFTO measuring sensor, which comprises a GIS shell hand hole, a hand hole cover plate, a sealing medium plate, two sealing washers, a metal shielding plate, a metal foil, an insulation film, a lead-out wire and a matching resistor. The middle of the hand hole cover plate is provided with a hole, the hand hole cover plate covers the GIS shell handle hole and is fixed, and a first sealing washer is arranged between the hand hole cover plate and the GIS shell hand hole; the sealing medium plate covers an inner side hole of the hand hole cover plate and is fixed, and a second sealing washer is arranged between the sealing medium plate and the hand hole cover plate; the metal shielding plate is arranged inside the hole on the hand hole cover plate, the insulation film is attached on the surface of the metal shielding plate, which is opposite to the sealing medium plate, and the metal foil is attached onto the insulation film; and the matching resistor is connected with the metal foil through the lead-out wire. By disassembling the metal shielding plate, the sensor is convenient to be replaced or examined, the replacement and the examination of the sensor can be operated on the spot without shutting down the electric grid, and the long-term on-line detection running can be realized.

Description

technical field [0001] The invention relates to the field of electrical equipment insulation detection, and more specifically relates to a flat-plate VFTO measuring sensor. Background technique [0002] GIS (Gas Insulated Switchgear, gas insulated substation) will generate VFTO (Very Fast Transient Voltage, fast transient overvoltage) during routine operation, its voltage amplitude is high, and its rising edge is steep, which is harmful to the safe operation of the power system. There is a greater hazard. At present, there are many types of sensors used for VFTO measurement. Compared with other measurement sensors, the flat VFTO measurement sensor has small parasitic inductance and high measurement bandwidth, which has attracted more and more attention from experts and scholars at home and abroad. [0003] When GIS is running, the pipeline needs to be filled with sulfur hexafluoride (SF6) gas at a certain pressure, and the airtightness of the GIS pipeline needs to be guaran...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/04
CPCH02B13/0356
Inventor 李成榕陈维江徐海瑞张博吴昊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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