Method and a device for voltage measurement in a high-voltage conductor
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01R-027/08
G01R-019/00
출원번호
US-0539278
(2003-12-18)
우선권정보
SE-0203861(2002-12-20)
국제출원번호
PCT/SE03/002023
(2003-12-18)
§371/§102 date
20060202
(20060202)
국제공개번호
WO04/057346
(2004-07-08)
발명자
/ 주소
Adolfsson,Morgan
Lundquist,Jan
H채fner,J체rgen
출원인 / 주소
ABB AB
대리인 / 주소
Venable LLP
인용정보
피인용 횟수 :
5인용 특허 :
7
초록▼
Measuring equipment for forming a measured value for voltage representing an ac voltage on a high-voltage conductor. The measuring equipment includes capacitor equipment with a known capacitance for connection between the high-voltage conductor and ground potential. The measuring equipment further
Measuring equipment for forming a measured value for voltage representing an ac voltage on a high-voltage conductor. The measuring equipment includes capacitor equipment with a known capacitance for connection between the high-voltage conductor and ground potential. The measuring equipment further includes a current-measurer for sensing a capacitor current flowing through the capacitor equipment and for forming the measured value for voltage in dependence on the capacitor current.
대표청구항▼
The invention claimed is: 1. Measuring equipment for forming a measured value for voltage representing an ac voltage on a high-voltage conductor, said measuring equipment comprising capacitor equipment with a known capacitance for connection between the high-voltage conductor and ground potential,
The invention claimed is: 1. Measuring equipment for forming a measured value for voltage representing an ac voltage on a high-voltage conductor, said measuring equipment comprising capacitor equipment with a known capacitance for connection between the high-voltage conductor and ground potential, wherein the capacitor equipment is in the form of a coupling capacitor with an external voltage terminal, wherein the capacitor equipment is arranged in a support insulator, wherein the measuring equipment comprises a screen of an electrically conductive material surrounding said external voltage terminal, and wherein said electrically conductive screen is electrically conductively connected to the casing of the support insulator and wherein the measuring equipment further comprises current-measuring means for sensing a capacitor current flowing through the capacitor equipment and for forming the measured value for voltage in dependence on said capacitor current. 2. The measuring equipment according to claim 1, wherein said current-measuring means comprises a resistor for connection in series with the capacitor equipment, the measured value for voltage being formed in dependence on a sensed voltage across the resistor representing the capacitor current. 3. The measuring equipment according to claim 1, wherein said current-measuring means comprises a digital/optical measurement value transformer for transforming the measured value for voltage into a series of light pulses representing the measured value for voltage. 4. The measuring equipment according to claim 3, wherein said resistor is connected between the high-voltage conductor and said external voltage terminal on the capacitor equipment and wherein, in addition thereto, it comprises current-measuring means for forming a measured value for current representing a line current flowing through the high-voltage conductor. 5. The measuring equipment according to claim 4, wherein the measured value for current is supplied to said digital/optical measurement value transformer for trans-forming the measured value for current into a series of light pulses representing the measured value for current. 6. The measuring equipment according to claim 5, wherein the digital/optical measurement value transformer is arranged to sequentially transform said measured value for voltage and said measured value for current into series of light pulses for sequential transmission to ground potential on a common optical transmission link. 7. The measuring equipment according to claim 4, wherein said current-measuring means are mounted on the top of said support insulator, and wherein said electrically conductive screen is electrically conductively connected to an electrically conductive part on the current-measuring means that is located at the potential of the high-voltage conductor but is electrically insulated from the external voltage terminal of the coupling capacitor. 8. A method for forming at least one measured value for voltage, representing an ac voltage on a high-voltage conductor, wherein measuring equipment comprising capacitor equipment with a known capacitance is connected between the high-voltage conductor and ground potential, wherein the capacitor equipment is constituted by a coupling capacitor, and wherein the coupling capacitor is provided with an external voltage terminal, and wherein the capacitor equipment is arranged in a support insulator, and wherein said measuring equipment is provided with a screen of an electrically conductive material, surrounding said external voltage terminal and being electrically conductively connected to the casing of the support insulator and wherein a capacitor current flowing through the capacitor equipment is sensed and wherein said measured value for voltage is formed in dependence on said capacitor current. 9. The method according to claim 8, wherein a resistor is connected in series with the high-voltage conductor and the capacitor equipment and wherein said capacitor current is sensed as a measured value for voltage across the resistor. 10. The method according to claim 8, wherein the measured value for voltage is supplied to a digital/optical measurement value transformer and that said the measured value for voltage is transformed into a series of light pulses representing the measured value for voltage. 11. The method according to claim 10, wherein said resistor is connected between the high-voltage conductor and said external voltage terminal on the capacitor equipment, and wherein, in addition thereto, a current measuring means is connected to the measuring equipment, and wherein a measured value far current, representing a line current flowing through the high-voltage conductor, is sensed. 12. The method according to claim 11, wherein the measured value for current is supplied to a digital/optical measurement value transformer, and wherein said measured value for current is transformed into a series of light pulses representing the measured value for current. 13. The method according to claim 12, wherein said measured value for voltage and said measured value for current are transmitted sequentially to ground potential on a common optical transmission link. 14. The method according to claim 11, wherein said current-measuring means is mounted on the top of said support insulator, and wherein said electrically conductive screen is electrically conductively connected to an electrically conductive part on the current-measuring means that is located at the potential of the high-voltage conductor but is electrically insulated from the external voltage terminal of the coupling capacitor.
Imrie James A. (18 Amberley Crescent Frankston ; Victoria 3199 AUX), High and low voltage measuring apparatus employing a single display and impedance matching.
Juds, Mark Allan; Rollmann, Paul J.; Zhou, Xin; Benke, James J.; Pahl, Birger; Marchand, Francois, System and method for sensing voltage in medium-to-high voltage applications.
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