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Voltage sensor

A technology of electric field sensor and sensor, applied in the direction of voltage divider, voltage/current isolation, measuring current/voltage, etc., can solve problems such as unused measured voltage

Inactive Publication Date: 2003-05-14
ALSTOM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The use of resistive materials in high voltage applications is known (e.g. in resistive dividers for separating voltages, or at cable terminations for measuring electric fields at the ends of high voltage cables), but not for measuring Voltage (EFS) shielding

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Embodiment Construction

[0029]The present invention is based on the applicant's discovery that not only can a resistive shield (RS) be used for high voltage measurements to isolate the sensor from external sources of interference, it can also be made to be practically as effective in shielding as prior art shields, And also with improved performance. Resistive shielding (RS) relies on resistive materials with electrical conductivity, which are more readily available than high-permittivity materials that require capacitive or dielectric shielding. Resistive materials are widely available and available in a variety of ways, and when implementing the invention there is a halfway point of using very thin ductile material, or even a suitably designed housing (isolation part 2, which will be explained below) of the appropriate shape and size covering the sensor. The possibility of conductive coatings provides better shielding and greatly reduces size and weight compared to the dielectric shielding describe...

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Abstract

A voltage sensor for measuring the voltage on high voltage lines is formed by an electrically isolating-section of material with resistive shielding (RS) that structures the electric field generated by a voltage difference between the two ends of the isolating-section and provides shielding of the internal electric field from sources of electric field interference external to the voltage sensor. At least one electric field sensor is provided to sense the electric field in the isolating-section the output(s) of which is(are) used to infer the voltage difference.

Description

technical field [0001] The present invention relates to a voltage sensor for measuring voltage, particularly suitable for measuring high voltages such as on high voltage electrical transmission lines. Background technique [0002] Known high voltage voltage sensors include inductive transformers, capacitive voltage dividers or capacitive voltage converters, and transducers utilizing bulk-optic electric field sensors. The former two sensors have the disadvantages of limited bandwidth, large failure loss, more maintenance work, heavy weight and unstable output. They also have the disadvantage of requiring good insulation, which is both expensive and potentially hazardous to the environment (e.g. grease and / or SF 6 gas). [0003] Pockels cells are well known devices that have been used to measure voltage, especially high voltages, see for example US Patent No. 5477134 to H. Hamada and US Patent No. 5731579 to G.K. Woods. A preferred form of Perks sensor for use in the presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/20G01R1/18G01R15/06G01R15/14G01R15/24G01R19/00
CPCG01R19/0053G01R1/18G01R15/247G01R15/144
Inventor 帕特里克·P·查维斯法诺什·拉马蒂安尼古拉斯·A·F·耶格克里斯托弗·P·亚基米西恩
Owner ALSTOM TECH LTD