US20040263179A1 - On-line detection of partial discharge in electrical power systems - Google Patents
On-line detection of partial discharge in electrical power systems Download PDFInfo
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- US20040263179A1 US20040263179A1 US10/894,568 US89456804A US2004263179A1 US 20040263179 A1 US20040263179 A1 US 20040263179A1 US 89456804 A US89456804 A US 89456804A US 2004263179 A1 US2004263179 A1 US 2004263179A1
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- partial discharge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
- H02H1/0015—Using arc detectors
Definitions
- the present invention is directed to detection of partial discharge events in power systems such as cables, motors and transformers, and more particularly to a method and apparatus for detecting partial discharge events on-line while the power system is in operation.
- Partial discharge events in high-voltage power systems are high-frequency discharges that take place in small portions of the system insulation. These discharges may have a duration on the order often to fifteen nanoseconds, and usually occur at a peak of the a.c. power cycle when electrical stress is highest within the insulation. Partial discharge events generate high frequency electromagnetic pulses that travel along the power systems.
- High voltage equipment for use in electrical power systems is conventionally tested off-line for partial discharge activity that may indicate insulation defects and possible insulation failure.
- These conventional techniques typically involve coupling a capacitor in parallel with the equipment under test and measuring the discharge signals across an external impedance such as a resonant circuit.
- the resonant circuit expands the discharge current pulses in the time domain so that the pulses are easier to detect and measure. Both amplitude and phase of each partial discharge pulse may be recorded and analyzed relative to the test voltage. Apparatus of this character is not well suited for detection and analysis of partial discharge events in power systems while the systems are on-line.
- FIG. 1 is a functional block diagram of an apparatus for on-line detection of partial discharge events in an a.c. power system in accordance with a presently preferred embodiment of the invention
- FIG. 2 is a schematic diagram of the inductive coupler in FIG. 1;
- FIGS. 3A, 3B, and 3 C are graphic illustrations useful in describing the operation of the invention.
- FIG. 1 illustrates apparatus 10 in accordance with a presently preferred embodiment of the invention for detecting partial discharge events in an a.c. power system 12 .
- power system 12 is shown as comprising a cable 14 that connects a load 16 to a power source 18 .
- Apparatus 10 is adapted to detect partial discharge events in cable 14 while system 12 is on-line—i.e., while power is being delivered by cable 14 from source 18 to load 16 .
- Apparatus 10 is also adapted to detect partial discharge events in other conventional high-voltage equipment such as motors, transformers, gas-insulated systems and the like.
- An inductive coupler 20 is operatively coupled to cable 14 for detecting high frequency electromagnetic pulses in cable 14 generated by partial discharge events, and feeding such pulses through an adjustable amplifier 22 to one input of a differential amplifier 24 .
- coupler 20 is illustrated in FIG. 2 as comprising a coil 26 mounted on a ferromagnetic core 28 .
- Core 28 is of annular construction, having a hinge 30 and opposed abutting ends at 32 for opening the core so as to encompass cable 14 .
- the electromagnetic pulses generated by partial discharge events in cable 14 are high-frequency electromagnetic pulses, typically in the VHF and UHF range.
- coupler 20 preferably is adapted to be responsive to electromagnetic signals in the VHF range, and to exclude signals outside of this range, including the electrical power signal in cable 14 typically at sixty hertz in the U.S.
- Differential amplifier 24 has a second input that receives a signal through an adjustable amplifier 34 from an antenna 36 .
- Antenna 36 may be a loop or dipole antenna adapted to be responsive to electromagnetic interference in the surrounding atmosphere within the frequency range of inductive coupler 20 —e.g., VHF radio signals.
- the signals received from antenna 36 are subtracted from those received from coupler 20 , so that the resulting output from the differential amplifier to a pre-amplifier 38 is indicative of the high frequency signals associated with partial discharge events from which the surrounding electromagnetic interference has been subtracted.
- the output of pre-amplifier 38 is fed through a filter 40 to a spectrum analyzer 42 .
- Spectrum analyzer 42 receives control inputs from a full span control 44 and a zero span control 46 for purposes to be described.
- the output of pre-amplifier 38 is also fed through a filter 48 to a pulse phase analyzer 50 .
- Pulse phase analyzer 50 also receives a reference voltage 52 indicative of the a.c. power signal in cable 14 .
- Spectrum analyzer 42 and pulse phase analyzer 50 are coupled to a controller 54 for controlling operation and providing for automated partial discharge analysis.
- Controller 54 receives operator input 56 , and is coupled to a display 58 for displaying signal information to the operator.
- Spectrum analyzer 42 is initially operated in a so-called full span mode for detecting and analyzing input information by amplitude or magnitude as a function of frequency over the entire frequency range set by full span control 44 .
- a typical output of analyzer 42 under full span control in the frequency domain, is illustrated in FIG. 3A.
- the partial discharge events result in signal peaks at multiple frequencies in the range of 200 KHz to 200 MHZ. In the specific example illustrated in FIG. 3A, the peak of greatest magnitude is at 24 MHz. These peaks or lines are indicative of the partial discharge activity in the cable. It is a characteristic of the electromagnetic pulses generated by partial discharge events that there is more attenuation at the higher frequencies than at the lower frequencies as the signal pulses travel through the cable.
- lines or peaks of greater magnitude at the high frequency end of the spectrum would indicate that the insulation anomaly is closer to the inductive coupler.
- the apparatus of the present invention can pinpoint the location of the partial discharge activity to within fifty feet.
- Spectrum analyzer 42 is then operated in the so-called zero span mode to isolate signal activity at one or more of the peaks illustrated in FIG. 3A.
- FIG. 3B illustrates partial discharge pulse amplitude as a function of time (i.e., in the time domain) at the 24 MHz frequency illustrated in FIG. 3A.
- the illustration of FIG. 3B has a time duration of 50 milliseconds, which corresponds to three cycles of the sixty Hz power signal in cable 40 . It will be seen in FIG. 3B that partial discharge events take place alternately at the positive and negative peaks of the power signal.
- the occurrence of partial discharge events at both the positive and negative peaks of the power signal indicates that the insulation anomaly in question is near the middle of the insulation between the center conductor and the outer sleeve or shield of the cable. If partial discharge events take place only at the positive peaks of the a.c. signal, this indicates that the insulation anomaly is near the center conductor, while the occurrence of partial discharge events on only the negative peaks indicates that the insulation anomaly is near the shield.
- the output of spectrum analyzer 42 in the full-span or frequency domain mode of operation, and in the zero-span or time domain mode of operation indicates location of the insulation anomaly both longitudinally and radially of the cable.
- Pulse phase analyzer 50 receives from filter 48 the high frequency electromagnetic pulses generated by the partial discharge events, and receives a reference voltage 52 indicative of the power signal in cable 14 . Analyzer 50 analyzes the phase angle of the partial discharge signals versus the reference voltage. FIG. 3C illustrates this relationship of pulse count in pulses per second versus partial discharge magnitude in millivolts versus phase angle. The information provided at pulse phase analyzer 50 helps determine the type of insulation anomaly that causes the partial discharge events. Pulse phase analyzer 50 provides: (1) phase angle data indicating the angle at which partial discharge occurs.
- the pulse magnitude indicates the severity of the problem.
- Spectrum analyzer 42 analyzes the detected signals as a function of frequency. One or more frequency lines can then be examined in the zero-span mode. Partial discharge signals occur at the peak of the operating voltage, while noise has no pattern to follow in the zero-span mode. When the partial discharge frequencies are identified, the signals at one or more frequencies are analyzed in the time-domain mode. The phase angle pattern analyzed at pulse phase analyzer 50 determines if the partial discharge signal is generated in the equipment under test or adjacent equipment. For example, if the partial discharge events take place at or near 90° phase angle to the a.c.
- the filter system disclosed allows discrimination between signals associated with partial discharge events and electromagnetic interference in the surrounding atmosphere.
Abstract
A method and apparatus for on-line detection of partial discharge events in an a.c. power system, in which high frequency electromagnetic pulses generated by partial discharge events are detected and analyzed in the frequency domain and the time domain to determine the type and location of the partial discharge event. The phase relationship between the partial discharge events and the on-line power signal is also examined to help indicate severity of the insulation anomaly giving rise to the partial discharge events.
Description
- This application is a continuation of application Ser. No. 09/174,032 filed Oct. 16, 1998.
- The present invention is directed to detection of partial discharge events in power systems such as cables, motors and transformers, and more particularly to a method and apparatus for detecting partial discharge events on-line while the power system is in operation.
- Partial discharge events in high-voltage power systems, such as high voltage power distribution cables, motors and transformers, are high-frequency discharges that take place in small portions of the system insulation. These discharges may have a duration on the order often to fifteen nanoseconds, and usually occur at a peak of the a.c. power cycle when electrical stress is highest within the insulation. Partial discharge events generate high frequency electromagnetic pulses that travel along the power systems.
- High voltage equipment for use in electrical power systems is conventionally tested off-line for partial discharge activity that may indicate insulation defects and possible insulation failure. These conventional techniques typically involve coupling a capacitor in parallel with the equipment under test and measuring the discharge signals across an external impedance such as a resonant circuit. The resonant circuit expands the discharge current pulses in the time domain so that the pulses are easier to detect and measure. Both amplitude and phase of each partial discharge pulse may be recorded and analyzed relative to the test voltage. Apparatus of this character is not well suited for detection and analysis of partial discharge events in power systems while the systems are on-line.
- It is therefore a general object of the present invention to provide a method and apparatus for detection and analysis of partial discharge events in an a.c. power system that are adapted for use on-line while the system is in operation, and that may be readily implemented for determining type and/or location of the partial discharges as they occur.
- The invention, together with additional objects, features and advantages thereof, will be best understood from the following description, the appended claims and the accompanying drawings in which:
- FIG. 1 is a functional block diagram of an apparatus for on-line detection of partial discharge events in an a.c. power system in accordance with a presently preferred embodiment of the invention;
- FIG. 2 is a schematic diagram of the inductive coupler in FIG. 1; and
- FIGS. 3A, 3B, and 3C are graphic illustrations useful in describing the operation of the invention.
- The disclosure in N. H. Ahmed and N. N. E. Srinivas, “On-line Partial Discharge Detection in Cables,” I.E.E.E. Transactions on Dielectrics and Electrical Insulation, Vol. 5, No. 2, pp 181-188 (April 1998) is incorporated herein by reference for purposes of background.
- FIG. 1 illustrates
apparatus 10 in accordance with a presently preferred embodiment of the invention for detecting partial discharge events in an a.c.power system 12. For purposes of illustration,power system 12 is shown as comprising acable 14 that connects aload 16 to apower source 18.Apparatus 10 is adapted to detect partial discharge events incable 14 whilesystem 12 is on-line—i.e., while power is being delivered bycable 14 fromsource 18 to load 16.Apparatus 10 is also adapted to detect partial discharge events in other conventional high-voltage equipment such as motors, transformers, gas-insulated systems and the like. - An
inductive coupler 20 is operatively coupled tocable 14 for detecting high frequency electromagnetic pulses incable 14 generated by partial discharge events, and feeding such pulses through anadjustable amplifier 22 to one input of adifferential amplifier 24. One presently preferred embodiment ofcoupler 20 is illustrated in FIG. 2 as comprising acoil 26 mounted on aferromagnetic core 28.Core 28 is of annular construction, having ahinge 30 and opposed abutting ends at 32 for opening the core so as to encompasscable 14. The electromagnetic pulses generated by partial discharge events incable 14 are high-frequency electromagnetic pulses, typically in the VHF and UHF range. The UHF signals are dissipated very quickly in the power system, socoupler 20 preferably is adapted to be responsive to electromagnetic signals in the VHF range, and to exclude signals outside of this range, including the electrical power signal incable 14 typically at sixty hertz in the U.S. -
Differential amplifier 24 has a second input that receives a signal through an adjustable amplifier 34 from anantenna 36.Antenna 36 may be a loop or dipole antenna adapted to be responsive to electromagnetic interference in the surrounding atmosphere within the frequency range ofinductive coupler 20—e.g., VHF radio signals. Withindifferential amplifier 24, the signals received fromantenna 36 are subtracted from those received fromcoupler 20, so that the resulting output from the differential amplifier to a pre-amplifier 38 is indicative of the high frequency signals associated with partial discharge events from which the surrounding electromagnetic interference has been subtracted. - The output of pre-amplifier 38 is fed through a
filter 40 to aspectrum analyzer 42.Spectrum analyzer 42 receives control inputs from afull span control 44 and a zerospan control 46 for purposes to be described. The output of pre-amplifier 38 is also fed through afilter 48 to apulse phase analyzer 50.Pulse phase analyzer 50 also receives areference voltage 52 indicative of the a.c. power signal incable 14.Spectrum analyzer 42 andpulse phase analyzer 50 are coupled to acontroller 54 for controlling operation and providing for automated partial discharge analysis.Controller 54 receivesoperator input 56, and is coupled to adisplay 58 for displaying signal information to the operator. -
Spectrum analyzer 42 is initially operated in a so-called full span mode for detecting and analyzing input information by amplitude or magnitude as a function of frequency over the entire frequency range set byfull span control 44. A typical output ofanalyzer 42, under full span control in the frequency domain, is illustrated in FIG. 3A. The partial discharge events result in signal peaks at multiple frequencies in the range of 200 KHz to 200 MHZ. In the specific example illustrated in FIG. 3A, the peak of greatest magnitude is at 24 MHz. These peaks or lines are indicative of the partial discharge activity in the cable. It is a characteristic of the electromagnetic pulses generated by partial discharge events that there is more attenuation at the higher frequencies than at the lower frequencies as the signal pulses travel through the cable. Consequently, receipt of signals predominately in the lower frequency range, as illustrated in FIG. 3A, indicates that the insulation anomaly that is causing the partial discharge events is fairly far away from the location ofcoupler 20. On the other hand, lines or peaks of greater magnitude at the high frequency end of the spectrum would indicate that the insulation anomaly is closer to the inductive coupler. Depending upon the type of cable involved, the apparatus of the present invention can pinpoint the location of the partial discharge activity to within fifty feet. -
Spectrum analyzer 42 is then operated in the so-called zero span mode to isolate signal activity at one or more of the peaks illustrated in FIG. 3A. For example, FIG. 3B illustrates partial discharge pulse amplitude as a function of time (i.e., in the time domain) at the 24 MHz frequency illustrated in FIG. 3A. The illustration of FIG. 3B has a time duration of 50 milliseconds, which corresponds to three cycles of the sixty Hz power signal incable 40. It will be seen in FIG. 3B that partial discharge events take place alternately at the positive and negative peaks of the power signal. The occurrence of partial discharge events at both the positive and negative peaks of the power signal indicates that the insulation anomaly in question is near the middle of the insulation between the center conductor and the outer sleeve or shield of the cable. If partial discharge events take place only at the positive peaks of the a.c. signal, this indicates that the insulation anomaly is near the center conductor, while the occurrence of partial discharge events on only the negative peaks indicates that the insulation anomaly is near the shield. Thus, the output ofspectrum analyzer 42 in the full-span or frequency domain mode of operation, and in the zero-span or time domain mode of operation, indicates location of the insulation anomaly both longitudinally and radially of the cable. -
Pulse phase analyzer 50 receives fromfilter 48 the high frequency electromagnetic pulses generated by the partial discharge events, and receives areference voltage 52 indicative of the power signal incable 14.Analyzer 50 analyzes the phase angle of the partial discharge signals versus the reference voltage. FIG. 3C illustrates this relationship of pulse count in pulses per second versus partial discharge magnitude in millivolts versus phase angle. The information provided atpulse phase analyzer 50 helps determine the type of insulation anomaly that causes the partial discharge events.Pulse phase analyzer 50 provides: (1) phase angle data indicating the angle at which partial discharge occurs. For example, if the partial discharge occurs at 90° phase angle, this means that the source of the partial discharge event is in air, such as near the termination ends of the cable; (2) whether partial discharge occurs at the positive, negative or both peaks of the a.c. signal. This helps analyze anomaly type, as discussed above; (3) the pulse magnitude indicates the severity of the problem. - There have thus been disclosed a method and apparatus for on-line detection of partial discharge events in a.c. power systems that distinguish the partial discharges from surrounding electromagnetic interference.
Spectrum analyzer 42 analyzes the detected signals as a function of frequency. One or more frequency lines can then be examined in the zero-span mode. Partial discharge signals occur at the peak of the operating voltage, while noise has no pattern to follow in the zero-span mode. When the partial discharge frequencies are identified, the signals at one or more frequencies are analyzed in the time-domain mode. The phase angle pattern analyzed atpulse phase analyzer 50 determines if the partial discharge signal is generated in the equipment under test or adjacent equipment. For example, if the partial discharge events take place at or near 90° phase angle to the a.c. signal, this means that the partial discharges are generated in the cable under test. If the events occur at plus or minus 120°0 phase angle, this means that the events are occurring in adjacent cables. The pulse count and magnitude atphase angle analyzer 50 are used to indicate the severity of the problem. The filter system disclosed allows discrimination between signals associated with partial discharge events and electromagnetic interference in the surrounding atmosphere.
Claims (9)
1. Apparatus for on-line location of partial discharge events in an a.c. power system during operation of the system while a.c. power is being applied through a power cable to a load, which includes:
a coupler for operative connection to the cable and responsive to current flowing through the cable for detecting high frequency electromagnetic pulses in the cable generated by partial discharge events caused by continuing application of a.c. power to the system,
a spectrum analyzer including means for operating said spectrum analyzer in a first mode of operation for analyzing pulses from said coupler in the frequency domain to identify a frequency at which partial discharge pulses of greatest magnitude are received at said coupler, and in a second mode of operation in the time domain at the frequency identified in said first mode of operation to identify a relationship between occurrence of said pulses and cycles of the a.c. power in the system, and
means for determining location of partial discharge events in the power system as a function of said frequency at which partial discharge pulses of greatest magnitude occur and said relationship between said pulses and cycles of a.c. power.
2. The apparatus set forth in claim 1 including:
a pulse phase analyzer for determining phase angle between said pulses detected by said coupler and a.c. power applied to the system, and
means for determining as a function of said phase angle a type of fault in the system that causes said partial discharge pulses.
3. The apparatus set forth in claim 2 including:
an antenna for receiving electromagnetic interference from the atmosphere surrounding the power cable, and
a differential amplifier connected between said coupler and said spectrum analyzer for subtracting said electromagnetic interference from said partial discharge pulses detected at said coupler.
4. The apparatus set forth in claim 1 wherein said coupler comprises an inductive coupler for removably exteriorly surrounding the cable to detect partial discharge current pulses in the cable.
5. Apparatus for on-line analysis of location of partial discharge events during operation of an a.c. power system in which a.c. power is being applied through a cable to a load, which includes:
first means for detecting in the cable high frequency electromagnetic pulses generated by partial discharge events in the power system caused by continuing application of a.c. power to the system,
second means for analyzing said pulses detected by said first means in the frequency domain to identify a frequency component of greatest magnitude in said pulses and the frequency of said component,
third means for analyzing pulses detected by said first means in the time domain at the frequency of said component identified by said second means to determine a phase relationship between said frequency component and cycles of the a.c. power in the system,
fourth means for identifying location of partial discharge events in the power system as a function of said frequency of said frequency component identified by said second means and said phase relationship determined by said third means,
fifth means for determining a phase relationship between pulses detected by said first means and the a.c. power being applied to said system, and
sixth means for determining a type of fault in said system that causes said partial discharge events as a function of said phase relationship determined by said fifth means.
6. The apparatus set forth in claim 5 wherein said first means includes means for detecting said pulses within a selected frequency range.
7. The apparatus set forth in claim 6 wherein said first means includes means for filtering within said selected frequency range said high frequency pulses generated by partial discharge events in the power system against high frequency signals in the surrounding atmosphere.
8. The apparatus set forth in claim 7 wherein said means for filtering said high frequency pulses includes means for detecting high frequency signals in the surrounding atmosphere within said selected frequency range, and means for subtracting said high frequency signals in the surrounding atmosphere from said pulses.
9. The apparatus set forth in claim 8 wherein said selected frequency range includes the VHF frequency range.
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| Application Number | Priority Date | Filing Date | Title |
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| US10/894,568 US20040263179A1 (en) | 1998-10-16 | 2004-07-20 | On-line detection of partial discharge in electrical power systems |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/174,032 US6809523B1 (en) | 1998-10-16 | 1998-10-16 | On-line detection of partial discharge in electrical power systems |
| US10/894,568 US20040263179A1 (en) | 1998-10-16 | 2004-07-20 | On-line detection of partial discharge in electrical power systems |
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| Application Number | Title | Priority Date | Filing Date |
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| US09/174,032 Continuation US6809523B1 (en) | 1998-10-16 | 1998-10-16 | On-line detection of partial discharge in electrical power systems |
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| US09/174,032 Expired - Fee Related US6809523B1 (en) | 1998-10-16 | 1998-10-16 | On-line detection of partial discharge in electrical power systems |
| US10/894,568 Abandoned US20040263179A1 (en) | 1998-10-16 | 2004-07-20 | On-line detection of partial discharge in electrical power systems |
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- 1998-10-16 US US09/174,032 patent/US6809523B1/en not_active Expired - Fee Related
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| US4625172A (en) * | 1980-07-16 | 1986-11-25 | Kokusai Denshin Denwa Co., Ltd. | Apparatus for supplying AC current to an underwater cable |
| US5440308A (en) * | 1987-02-12 | 1995-08-08 | The Aerospace Corporation | Apparatus and method for employing adaptive interference cancellation over a wide bandwidth |
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| US5394185A (en) * | 1993-01-08 | 1995-02-28 | Tektronix, Inc. | In-service CATV HUM measurement technique |
| US5475312A (en) * | 1994-06-07 | 1995-12-12 | Iris Power Engineering Inc. | Method and device for distinguishing between partial discharge and electrical noise |
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| US8126664B2 (en) | 2005-05-20 | 2012-02-28 | HYDRO-QUéBEC | Detection, localization and interpretation of partial discharge |
| WO2006122415A1 (en) * | 2005-05-20 | 2006-11-23 | HYDRO-QUéBEC | Detection, localization and interpretation of partial discharge |
| EP1883829A1 (en) * | 2005-05-20 | 2008-02-06 | Hydro-Quebec | Detection, localization and interpretation of partial discharge |
| EP1883829A4 (en) * | 2005-05-20 | 2009-04-08 | Hydro Quebec | Detection, localization and interpretation of partial discharge |
| US20090177420A1 (en) * | 2005-05-20 | 2009-07-09 | Daniel Fournier | Detection, localization and interpretation of partial discharge |
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| US7282923B2 (en) | 2005-09-20 | 2007-10-16 | General Electric Company | Systems and methods for triggering a partial discharge acquisition |
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| US7800051B2 (en) | 2007-01-10 | 2010-09-21 | Hydro-Quebec | Apparatus and method for monitoring snow water equivalent and soil moisture content using natural gamma radiation |
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| US20170212163A1 (en) * | 2014-05-21 | 2017-07-27 | Siemens Aktiengesellschaft | Circuit Arrangement For A High-Voltage Test Installation |
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| CN104062571A (en) * | 2014-07-14 | 2014-09-24 | 国家电网公司 | Power transformer partial discharging signal windowing display method |
| CN104198902A (en) * | 2014-08-20 | 2014-12-10 | 上海交通大学 | Method for improving local discharge ultrahigh frequency detection effect of 110kV cable joint |
| CN104459498A (en) * | 2014-12-22 | 2015-03-25 | 国网上海市电力公司 | Method for suppressing interference on partial discharge test of ultra-high voltage AC transformer |
| US10502774B2 (en) | 2015-03-25 | 2019-12-10 | Pdp-Technologies Ltd | System for detecting electromagnetic discharge fields |
| WO2016151572A1 (en) * | 2015-03-25 | 2016-09-29 | Pdp-Technologies Ltd | System for detecting electromagnetic discharge fields |
| CN106569107A (en) * | 2016-11-02 | 2017-04-19 | 国网江西省电力公司电力科学研究院 | Partial discharge determining method combining sulfur hexafluoride centralized analysis and ultrahigh frequency |
| CN112198400A (en) * | 2020-09-30 | 2021-01-08 | 国网福建省电力有限公司漳州供电公司 | High-voltage switch cabinet partial discharge online detection method based on spectrum sensing characteristic |
| WO2022152339A1 (en) | 2021-01-18 | 2022-07-21 | Modemtec S.R.O. | Signal extraction method and device for its implementation |
| CN113884846A (en) * | 2021-12-07 | 2022-01-04 | 山东理工大学 | Partial discharge and temperature rise online monitoring system for switch cabinet |
| CN115047302A (en) * | 2022-08-15 | 2022-09-13 | 国网江西省电力有限公司电力科学研究院 | Cable series resonance partial discharge detection system and method based on double transformers |
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| Publication number | Publication date |
|---|---|
| CA2273526A1 (en) | 2000-04-16 |
| US6809523B1 (en) | 2004-10-26 |
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Legal Events
| Date | Code | Title | Description |
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| AS | Assignment |
Owner name: DTE ENERGY TECHNOLOGIES, INC., MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:THE DETROIT EDISON COMPANY;REEL/FRAME:015341/0752 Effective date: 20000828 |
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| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |