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Wide bandwidth, ultra-high accuracy hvdc current measurement equipment

A technology of equipment and current, applied in the field of ultra-high voltage DC power transmission, can solve problems such as inapplicable measurement

Inactive Publication Date: 2016-12-21
ALSTOM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processes are not suitable for measuring broadband current I with a DC component and multiple spectral components LB

Method used

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  • Wide bandwidth, ultra-high accuracy hvdc current measurement equipment
  • Wide bandwidth, ultra-high accuracy hvdc current measurement equipment
  • Wide bandwidth, ultra-high accuracy hvdc current measurement equipment

Examples

Experimental program
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Embodiment Construction

[0075] The idea on which the invention is based is to combine a passive sensor with an active sensor along the current I to be measured LB The conductors that flow through are installed. Passive sensors are highly accurate and stable measuring shunts mounted directly on conductors, and active sensors are Faraday sensors whose optical waveguides are mounted directly on conductors.

[0076] The Faraday sensor can be a fiber optic type or a ring glass type sensor. refer to figure 1 A block diagram of a Faraday sensor is described. This is assumed to be the output from the Faraday sensor above labeled V OUT The voltage signal is a digital signal.

[0077] Those skilled in the art will understand how to make adjustments and modifications to the elements of the Faraday sensor described above and composed according to the nature of the optical waveguide used.

[0078] Measuring shunt means a resistive shunt associated with a device of the voltmeter type, which is connected in pa...

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PUM

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Abstract

The subject of the invention is a method for controlling the current (I) flowing in a high voltage conductor (5). LB ) current measuring device (21) for measuring, characterized in that said device (20) comprises: a Faraday sensor (1) comprising a waveguide (4) installed around said conductor (5), said Faraday sensor (1) Provide a first digital signal (S1) which represents the value of the current and which depends on a variable coefficient (a') called the Faraday coefficient; measure the shunt (21), which is mounted in series on said conductor (5) and provides a second digital signal (S2) representing the value of said current and as a ratio of said shunt (R(f) ) functions; computing means (23) which receive said two digital signals (S1, S2) as input and are adapted to extract a first DC component (S1) from said first digital signal and from said second A second DC component (S2) is extracted from the two digital signals and adapted to calculate the value of said Faraday coefficient (a') on the basis of these components, said calculation means being adapted to thereby use said Faraday coefficient and according to said The calculated value of the first digital signal (S1) is based on the current (I LB ).

Description

technical field [0001] The invention relates to the field of transmitting ultra-high voltage direct current electric energy. In particular, the invention relates to a device enabling the measurement of DC current in a high-voltage power station at the output of a switching converter. Background technique [0002] Modern HVDC (High Voltage Direct Current) substations, such as AIS (Air Insulated Station, Air Insulated Station) and GIS (Gas Insulated Station, Gas Insulated Station) substations, require controlled stage converters with high switching Frequency, fast power, and voltage of about 800kV amplitude. [0003] The current spectrum at the output of a converter of the converter or rectifier type includes, in addition to a zero frequency component (DC component), residual harmonics (AC component) in the frequency range up to several kilohertz. [0004] Knowing the value of the "full or composite" current signal (ie from DC to the highest AC frequency) is required in orde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R15/24
CPCG01R15/246G01R1/203G01R15/08G01R35/005
Inventor 丹尼斯·查特佛让-弗朗索瓦·米若纽蒂埃里·荣格朱利安·伯德斯
Owner ALSTOM TECH LTD