Radio-interrogated, surface-wave technology current transformer for high-voltage systems
First Claim
1. A current transformer for current strength measurement on/in electrical devices at high voltage, comprising:
- a surface-wave configuration having surface-wave structures and an antenna;
a magnetosensitive element coupled to at least one of said surface-wave structures; and
a radiofrequency transmitter and receiver having a radio antenna and an electronic evaluation device, said transmitter constructed for radio transmission of an interrogation pulse and said receiver with said evaluation device constructed for radio reception and for evaluation of a change influenced by an instantaneous magnetic field in a high-voltage device, the change occurring in an impulse response of said surface-wave configuration.
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Accused Products
Abstract
A radio-interrogated, surface-wave technology current transformer for high/medium-voltage systems includes a magnetosensitive element connected to a surface-wave structure of a surface-wave configuration as a termination of the surface-wave structure. A response signal of the surface-wave configuration is information regarding current strength/direction and phase of the current instantaneously flowing through the system, which is evaluated by a ground station. By virtue of the radio transmission, there is no electrical insulation problem, and the use of a radio-interrogated surface-wave configuration makes that part of the overall current transducer which is at high potential into a passive element of the same.
41 Citations
18 Claims
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1. A current transformer for current strength measurement on/in electrical devices at high voltage, comprising:
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a surface-wave configuration having surface-wave structures and an antenna; a magnetosensitive element coupled to at least one of said surface-wave structures; and a radiofrequency transmitter and receiver having a radio antenna and an electronic evaluation device, said transmitter constructed for radio transmission of an interrogation pulse and said receiver with said evaluation device constructed for radio reception and for evaluation of a change influenced by an instantaneous magnetic field in a high-voltage device, the change occurring in an impulse response of said surface-wave configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A current transformer assembly for current strength measurement on/in electrical devices at high voltage, comprising:
two current-transformers each including; a surface-wave configuration having surface-wave structures and an antenna; a magnetosensitive element coupled to at least one of said surface-wave structures; a radiofrequency transmitter and receiver having a radio antenna and an electronic evaluation device, said transmitter constructed for radio transmission of an interrogation pulse and said receiver with said evaluation device constructed for radio reception and for evaluation of a change influenced by an instantaneous magnetic field in a high-voltage device, the change occurring in an impulse response of said surface-wave configuration; and a device with a DC magnetic field superposed with a magnetic field of a current to be measured;
the DC magnetic field of one of said current-transformer devices having an opposite polarity to the DC magnetic field of the other of said current-transformer devices, relative to the magnetic field to be measured, for shifting an operating point in respectively mutually opposite directions.
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16. A current transformer assembly for current strength measurement on/in electrical devices at high voltage, comprising:
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a high-voltage/medium-voltage cable; and current-transformer disposed in said cable, said current-transformer including; a surface-wave configuration having surface-wave structures and an antenna; a magnetosensitive element coupled to at least one of said surface-wave structures; and a radiofrequency transmitter and receiver having a radio antenna and an electronic evaluation device, said transmitter constructed for radio transmission of an interrogation pulse and said receiver with said evaluation device constructed for radio reception and for evaluation of a change influenced by an instantaneous magnetic field in a high-voltage device, the change occurring in an impulse response of said surface-wave configuration. - View Dependent Claims (17, 18)
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Specification