Detection of geomagnetically-induced currents with power line-mounted devices
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01R-015/18
G01R-019/00
G01R-021/08
출원번호
US-0597377
(2015-01-15)
등록번호
US-9217762
(2015-12-22)
발명자
/ 주소
Kreikebaum, Frank
Phillipsen, Paul
Ross, Stuart E.
Starodubtsev, Yuli
출원인 / 주소
SMART WIRES INC.
대리인 / 주소
Marsh Fischmann & Breyfogle LLP
인용정보
피인용 횟수 :
6인용 특허 :
11
초록▼
A device for use in a power transmission system to sense GICs. The device may be a part of a reactance-injecting device on a power line, it may be a standalone device, or it may be a part of another type of device. The device may include a sensor to sense magnetic fields (e.g., a Hall effect sensor)
A device for use in a power transmission system to sense GICs. The device may be a part of a reactance-injecting device on a power line, it may be a standalone device, or it may be a part of another type of device. The device may include a sensor to sense magnetic fields (e.g., a Hall effect sensor). The sensor may be positioned in the air gap of a magnetic core formed concentrically around the power line. The signal from the sensor may be converted to a digital signal and separately processed to determine the magnitude of the AC current and the magnitude of the DC (or quasi-DC) current. If the output signal of another A/C current sensor is available, that output signal may be used to adjust/calibrate the determined magnitude of the DC current. The sensor may communicate with other devices in a network to provide GIC information.
대표청구항▼
1. A device for monitoring geomagnetically-induced currents in a power line, comprising: a magnetic core disposed about at least part of a power line, the core being configured to provide an air gap therein;a magnetic sensor positioned in the air gap to sense magnetic fields and produce an output si
1. A device for monitoring geomagnetically-induced currents in a power line, comprising: a magnetic core disposed about at least part of a power line, the core being configured to provide an air gap therein;a magnetic sensor positioned in the air gap to sense magnetic fields and produce an output signal representative of the magnetic fields; anda signal processing unit that receives the output signal and determines the geomagnetically-induced current therefrom;wherein the signal processing unit determines a DC component and an AC component; andwherein the determined AC component is compared to a reference signal representative of an external measurement of the AC current in the power line and, based on the comparison, the determined DC component is adjusted in proportion thereto. 2. A device as defined in claim 1, wherein the device is configured for mounting onto a power line by at least substantially surrounding the power line. 3. A device as claimed in claim 1, further including an upper housing and a lower housing that are configured for placement around a power line and for attachment to each other to contain the core, sensor, and signal processing unit therein. 4. A device as claimed in claim 1, wherein the core includes at least two separate core portions. 5. A device as claimed in claim 1, wherein the core includes at least three separate core portions. 6. A device as claimed in claim 5, wherein one of the three separate core portions is configured to extend approximately 180 degrees around the power line. 7. A device as claimed in claim 5, wherein two of the three separate core portions are each configured to extend approximately 90 degrees around the power line. 8. A device as claimed in claim 1, wherein the signal processing unit processes signals at or near DC with a DC processing portion. 9. A device as claimed in claim 8, wherein the DC processing portion includes a low pass filter. 10. A device as claimed in claim 8, wherein the DC processing portion includes a unit for determining the mean of the signals and providing a DC component signal representative thereof. 11. A device as claimed in claim 1, wherein the signal processing unit separately processes AC signals and signals at or near DC with an AC processing portion and a DC processing portion, respectively. 12. A device as claimed in claim 11, wherein the AC processing portion includes a unit for determining the RMS value of the output signal and providing the AC component. 13. A device as claimed in claim 11, wherein the AC processing portion includes a high pass filter. 14. A device as claimed in claim 13, wherein the AC processing portion includes a unit for determining the RMS value of the output signal and providing the AC component. 15. A device as claimed in claim 14, wherein the AC processing portion includes a ratio-determining unit that determines the ratio of the reference signal to the AC component and produces a ratio signal representative thereof. 16. A device as claimed in claim 15, wherein the reference signal is determined externally by a different AC current monitor. 17. A device as claimed in claim 1, wherein the signal processing unit separately processes AC signals and signals at or near DC with an AC processing portion and a DC processing portion, respectively; wherein the DC processing portion includes a unit for determining the mean of the signals and providing a DC component signal representative thereof;wherein the AC processing portion includes a unit for determining the RMS value of the AC signals and providing an AC component signal representative thereof;wherein the AC processing portion includes a ratio-determining unit that determines the ratio of the reference signal to the AC component signal and produces a ratio signal representative thereof; andwherein the signal processing unit includes a multiplier unit that multiplies the DC component signal by the ratio signal. 18. A device as defined in claim 1, wherein the device includes a transmitter and an antenna for communicating geomagnetically-induced current information to an external device. 19. A device as defined in claim 18, wherein the external device includes a receiver for receiving information related to geomagnetically-induced currents. 20. A device as defined in claim 1, wherein the device includes a current transformer for drawing current off of the power line to provide operating power to the device. 21. A device as defined in claim 1, wherein the magnetic sensor includes a Hall effect sensor. 22. A device as defined in claim 21, wherein the output signal from the sensor is an analog signal and the device includes an analog-to-digital (A/D) converter. 23. A device as defined in claim 22, wherein the analog signal is provided from the sensor to the A/D converter via a twisted pair of wires. 24. A device as defined in claim 1, wherein the device includes an injecting unit for injecting reactance into the power line. 25. A device as defined in claim 24, wherein the injecting unit includes a coil placed relative to a power line in order to inject the reactance therein. 26. A device for monitoring geomagnetically-induced currents in a power line, comprising: a magnetic core disposed about at least part of a power line, the core being configured to provide an air gap therein;a magnetic sensor positioned in the air gap to sense magnetic fields and produce an output signal representative of the magnetic fields; anda signal processing unit that receives the output signal and determines the geomagnetically-induced current therefromwherein the signal processing unit separately processes AC signals and signals at or near DC with an AC processing portion and a DC processing portion, respectively;wherein the AC processing portion includes a high pass filter;wherein the AC processing portion includes a unit for determining the RMS value of the signal and providing an AC component signal representative thereof;wherein the AC processing portion includes a ratio-determining unit that determines the ratio of a reference signal to the AC component signal and produces a ratio signal representative thereof. 27. A device as claimed in claim 26, wherein the reference signal is determined externally by a different AC current monitor. 28. A device as defined in claim 26, wherein the device includes an injecting unit for injecting reactance into the power line. 29. A device for monitoring geomagnetically-induced currents in a power line, comprising: a magnetic core disposed about at least part of a power line, the core being configured to provide an air gap therein;a magnetic sensor positioned in the air gap to sense magnetic fields and produce an output signal representative of the magnetic fields; anda signal processing unit that receives the output signal and determines the geomagnetically-induced current therefrom;wherein the signal processing unit separately processes AC signals and signals at or near DC with an AC processing portion and a DC processing portion, respectively;wherein the DC processing portion includes a unit for determining the mean of the signals and providing a DC component signal representative thereof;wherein the AC processing portion includes a unit for determining the RMS value of the signal and providing an AC component signal representative thereof;wherein the AC processing portion includes a ratio-determining unit that determines the ratio of a reference signal to the AC component signal and produces a ratio signal representative thereof; andwherein the signal processing unit includes a multiplier unit that multiplies the DC component signal by the ratio signal. 30. A device as defined in claim 29, wherein the device includes an injecting unit for injecting reactance into the power line.
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