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A device for monitoring a gas-insulated high-voltage substation by measuring partial discharges and the gas-insulated high-voltage substation using the device

A switchgear, gas-insulated technology, applied in the device field of monitoring gas-insulated high-voltage electric switchgear

Inactive Publication Date: 2014-12-24
ALSTOM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be shown that the influence of the environment of the antenna (e.g. circular base plate) is so large that the closed-form approach of conventional antenna theory cannot be used
By performing measurements, it was observed that the sensitivity of the sensor can be adapted to the environment by means of the cone angle, but the results do not fit the theoretical formula mentioned in reference (2), due to the spur between the recess of the sensor and the head capacitance

Method used

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  • A device for monitoring a gas-insulated high-voltage substation by measuring partial discharges and the gas-insulated high-voltage substation using the device
  • A device for monitoring a gas-insulated high-voltage substation by measuring partial discharges and the gas-insulated high-voltage substation using the device
  • A device for monitoring a gas-insulated high-voltage substation by measuring partial discharges and the gas-insulated high-voltage substation using the device

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Embodiment Construction

[0028] like figure 1 For the first embodiment and figure 2 As shown for the second embodiment in , the device of the invention comprises: an electric field sensor (E field sensor) 10 comprising a metal plate 13 adapted to be fastened to a wall 11 of an enclosure of a high voltage electrical switching apparatus; a tapered metal portion 12 , the open part of which is closed by the cover, the open end of the other end extends into the bushing 14 passing through the metal plate 13, which serves as the base plate of the resulting conical antenna; and the connector 15, which is connected to the bushing 14. This connector 15 is used to connect the bushing 14 via a coaxial cable (not shown in the figure) to the measurement and display device.

[0029] Figure 5 Another embodiment is shown in which the sensor 10 is fastened directly to the housing 11 of a gas insulated electrical switchgear (without metal plates). The sleeve 14a and the inner conductor 14b of the bushing 14 form ...

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Abstract

The present invention relates to a device for monitoring a gas-insulated high-voltage substation by measuring partial discharges, including an enclosure (11); an electrical field sensor (10) comprising a metal plate (13) attached to the wall of the enclosure (11); a conical metal part (12) closed with a cover at the flared portion thereof, the other end of same extending into the enclosure and opening into a bushing (14) that extends through the metal plate (13) which serves as a back-plane for the conical antenna thus formed; and a connector (15) connected to the bushing (14), which can be used to connect the bushing (14) to a measurement and display device via a coaxial cable.

Description

technical field [0001] The invention relates to a device for monitoring a gas-insulated high-voltage switchgear by measuring partial discharges, and also to a gas-insulated high-voltage switchgear using said device. Background technique [0002] The field of the invention is that of monitoring shielded electrical switchgears insulated by gases such as sulfur hexafluoride. [0003] Monitoring gas-insulated high-voltage switchgear by measuring partial discharges is widely used. However, there is currently a need for low-cost, high-gain sensors with wider bandwidths, eg, from 100 megahertz (MHz) to 2 gigahertz (GHz). There is also a need to simultaneously measure ultra high frequency (UHF) signals as well as signals at power frequencies. [0004] Reference (1) (see list at the end of the description) describes a device for measuring voltage pulses caused by partial discharges in gas-insulated electrical switchgear by means of a capacitive voltage divider, said device being a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/08G01R31/12
CPCG01R29/0878G01R31/1254
Inventor 戴维·高奇
Owner ALSTOM TECH LTD
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