CN102608389B - Measurement method and measurement system for VFTC (very fast transient current) - Google Patents
Measurement method and measurement system for VFTC (very fast transient current) Download PDFInfo
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- CN102608389B CN102608389B CN201210064866.XA CN201210064866A CN102608389B CN 102608389 B CN102608389 B CN 102608389B CN 201210064866 A CN201210064866 A CN 201210064866A CN 102608389 B CN102608389 B CN 102608389B
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- 238000005259 measurement Methods 0.000 title claims abstract description 23
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- 239000013307 optical fiber Substances 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 35
- 230000008054 signal transmission Effects 0.000 claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims description 53
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- 230000005540 biological transmission Effects 0.000 claims description 24
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- 238000010586 diagram Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 238000011160 research Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
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- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
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- 239000003292 glue Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
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- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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Abstract
The invention discloses a measurement method and a measurement system for VFTC (very fast transient current), which relate to the technical field of over-voltage protection for power systems. A Rogowski coil is used to measure the VFTC generated in make and break of a no-load short bus via a disconnector in GIS (gas insulated switchgear), measurement signals are transmitted to measurement equipment through optical fibers, and laser is used to supply power for high potential measurement of the VFTC through optical fibers. By the system and the method, the Rogowski coil is used to measure the VFTC generated in make and break of the no-load short bus via the disconnector in the GIS, power supply and signal transmission are achieved through the optical fibers, and accordingly the problems of wide band, interference resistance, potential isolation, signal transmission, power supply and the like required in measurement of interior VFTC of the GIS by high potential measurement are solved.
Description
Technical field
The present invention relates to Hyper-Voltage of Power Systems resist technology field, relate in particular to measuring method and the system of a kind of VFTC (Very Fast Transient Current, very fast transient electric current).
Background technology
In power industry, GIS refers to sulfur hexafluoride sealed combination electrical equipment, be called in the world " Cubicle Gas-Insulated Switchgear " (Gas Insulated Switchgear) and be called for short GIS, it is by the primary equipment except transformer in a transformer station, comprise isolating switch, disconnector, grounding switch, voltage transformer (VT), current transformer, lightning arrester, bus, cable termination, inlet-outlet sleeve etc., be organically combined into an entirety through optimal design.The advantage of GIS is that floor area is little, and reliability is high, high safety, and maintenance workload is very little.When disconnector suits unloaded bus in GIS, can produce repeatedly bang and wear, produce the VFTO of frequency up to MHz up to a hundred, may work the mischief to GIS and nearby device thereof in the above system of 330kV electric pressure.Existing research lacks measurement and the experimental study to VFTC, causes the arc characteristic after isolation switch contact gap breakdown is known little about it, and can only adopt some simple Arc Modellings to carry out emulation, causes the measurement result of VFTO and simulation result mutually not to confirm.The measurement of VFTC can provide research technique for the arc characteristic research of disconnector, by the measured waveform of VFTC and VFTO is analyzed, can specify generation, arcing characteristic and the blow-out rule of disconnector electric arc, for the research of disconnector arc characteristic and simulation modeling provide test basis.But realize the Measurement accuracy of VFTC in GIS, there is higher difficulty.
Summary of the invention
In view of this, the technical matters that the present invention will solve is to provide the measuring system of a kind of VFTC, can utilize Rogowski coil to carry out VFTC measurement.
A measuring system of very fast transient electric current VFTC, comprising: measurement subsystem, for using Rogowski coil to measure the VFTC producing in the unloaded short bus process of GIS disconnector folding; Transmission subsystem, arrives measuring equipment for the VFTC signal that described Rogowski coil is measured by Optical Fiber Transmission; Laser energy supply device, for adopting laser to provide power supply for described transmission subsystem by optical fiber.
An embodiment of system according to the invention, in described GIS, high frequency Rogowski coil is installed at the static contact place of disconnector; Described transmission subsystem comprises optical sender and photoreceiver; The VFTC signal that described high frequency Rogowski coil is measured is converted to light signal by described optical sender, transmits by optical fiber, and described photoreceiver is converted to described light signal electric signal and is transferred to described measuring equipment.
An embodiment of system according to the invention, described optical sender and described Rogowski coil are enclosed in described static contact; Described Rogowski coil is arranged on the contact tube in described static contact; The VFTC signal that described optical sender is measured described Rogowski coil is converted into light signal, by optical fiber, described light signal is drawn from GIS; Described photoreceiver outside described GIS receives described light signal, and described light signal is converted to electric signal, accesses described measuring equipment; The described laser energy supply device being placed in outside described GIS is powered to described optical sender by energy supply optical fiber.
An embodiment of system according to the invention, in described static contact inside, adds metal shielding box in the outside of described Rogowski coil and optical sender; By described photoreceiver and described laser energy supply device separate packages, described photoreceiver adopts powered battery.
An embodiment of system according to the invention, uses multimode optical fiber that the laser energy supply interface of described optical sender is connected with the Laser output interface of the described laser energy supply device outside described GIS cavity; Use single-mode fiber that the signal transmission interface of described optical sender is connected with the light signal input interface on photoreceiver outside described GIS cavity; Use concentric cable to connect electrical signal output interface and the described measuring equipment on described photoreceiver.
System of the present invention utilizes Rogowski coil to measure the VFTC producing in the unloaded short bus process of disconnector folding in GIS, and carries out electric power supply and signal transmission by optical fiber.
The technical matters that the present invention will solve is to provide the measuring method of a kind of VFTC, can utilize Rogowski coil to carry out VFTC measurement.
A measuring method of very fast transient electric current VFTC, is characterized in that, comprising: use Rogowski coil to measure the VFTC producing in the unloaded short bus process of disconnector folding in GIS; The signal of the VFTC that described Rogowski coil is measured arrives measuring equipment by Optical Fiber Transmission, and adopts laser to provide power supply for measuring VFTC by optical fiber.
According to the inventive method embodiment, in described GIS, high frequency Rogowski coil is installed at the static contact place of disconnector, the VFTC signal that described high frequency Rogowski coil is measured is converted to light signal by optical sender, transmit by optical fiber, light signal is converted to electric signal and is transferred to described measuring equipment by photoreceiver at receiving end.
According to the inventive method embodiment, described optical sender and described Rogowski coil are enclosed in described static contact; Described Rogowski coil is arranged on the contact tube in described static contact; The VFTC signal that described optical sender is measured described Rogowski coil is converted to light signal, by optical fiber, described light signal is drawn from GIS; Described photoreceiver outside described GIS receives described light signal, and described light signal is converted to electric signal, and sends to described measuring equipment; The described laser energy supply device being placed in outside described GIS is powered to described optical sender by energy supply optical fiber.
According to the inventive method embodiment, in described static contact inside, at described Rogowski coil and the outside interpolation of optical sender metal shielding box, and by described photoreceiver and described laser energy supply device separate packages; Described photoreceiver adopts powered battery.
According to the inventive method embodiment, use multimode optical fiber that the laser energy supply interface of described optical sender is connected with the Laser output interface of the described laser energy supply device outside described GIS cavity; Use single-mode fiber that the signal transmission interface of described optical sender is connected with the light signal input interface on photoreceiver outside described GIS cavity; Use concentric cable to connect electrical signal output interface and the described measuring equipment on described photoreceiver.
Method of the present invention utilizes Rogowski coil to measure the VFTC producing in the unloaded short bus process of disconnector folding in GIS, carries out electric power supply and signal transmission by optical fiber.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the present invention's design to be suitable for the various embodiment with various amendments of special-purpose.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is according to the schematic diagram of the measuring system of VFTC of the present invention embodiment;
Fig. 2 is according to the schematic diagram of another embodiment of the measuring system of VFTC of the present invention;
Fig. 3 is according to the schematic diagram of the measuring circuit of the measuring system of VFTC of the present invention embodiment;
Fig. 4 is the process flow diagram of an embodiment of the measuring method of the VFTC according to the present invention;
Fig. 5 is the schematic diagram of an embodiment of placement sensor coil in static contact of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is according to the schematic diagram of the measuring system of VFTC of the present invention embodiment.As shown in Figure 1:
The measuring system 1 of VFTC comprises: measurement subsystem 11, transmission subsystem 12 and laser energy supply device 13.Measurement subsystem 11 is used Rogowski coil to measure the very fast transient electric current VFTC that in GIS, the unloaded short bus of disconnector folding produces.Transmission subsystem 12 arrives measuring equipment by measuring-signal by Optical Fiber Transmission; Laser energy supply device 13 adopts laser to provide power supply for transmission subsystem by optical fiber.
Fig. 2 is according to the schematic diagram of another embodiment of the measuring system of VFTC of the present invention.As shown in Figure 2:
Use Rogowski coil to measure the VFTC that in GIS, the unloaded short bus of disconnector folding produces at noble potential place, also can use Rogowski coil to measure VFTC at electronegative potential place, in GIS, high frequency Rogowski coil is installed at the static contact place of disconnector.Transmission subsystem 21 comprises optical sender 211 and photoreceiver 212.The VFTC signal that high frequency Rogowski coil is measured is delivered to optical sender 211 by optical fiber transmission, and be converted to light signal by optical sender 211, transmit by optical fiber, light signal is converted into electric signal and is transferred to measuring equipment by photoreceiver 212 at receiving end.Laser energy supply device 22 is by energy supply optical fiber, adopts laser to provide power supply for transmission subsystem.
According to one embodiment of present invention, optical sender 211 is enclosed in static contact together with Rogowski coil.Rogowski coil is arranged on the contact tube in static contact, and the signal that VFTC measured by Rogowski coil by optical sender 211 is converted into light signal, by optical fiber, light signal is drawn in disconnector from GIS.Photoreceiver 212 in GIS outside disconnector receives light signal, and light signal is converted into electric signal, access measuring equipment.The laser energy supply device 22 being placed in outside GIS disconnector is powered to optical sender by energy supply optical fiber.
System of the present invention utilizes Rogowski coil to measure the VFTC producing in the unloaded short bus process of disconnector folding in GIS, and carry out electric power supply and signal transmission by fibre system, solve the inner noble potential of GIS and measured a series of difficult problems such as the required broadband of VFTC, anti-interference, potential isolation, signal transmission, electric power supply, through implementing, measuring system bandwidth has reached 70MHz, obtain good measurement effect, grasped characteristic and the rule of development of hf electric arc by measuring VFTC.
Fig. 3 is according to the schematic diagram of the measuring circuit of the measuring system of VFTC of the present invention embodiment.As shown in Figure 3, the actual measurement loop of the measuring system of VFTC comprises disconnector 35, rogowski coil 36, optical sender 37, photoreceiver 38 and measuring equipment 39 in testing transformer 31, protection inductance 32, coupling capacitance 33, sleeve pipe 34, GIS.Rogowski coil 36 is arranged on the static contact of load-side of disconnector 35 mains sides, and in GIS, the static contact place design and installation high frequency Rogowski coil 36 of disconnector 35 is measured VFTC, and Rogowski coil 36 is measured at noble potential place.Output signal is transferred to earth potential by analog optical fiber after electric light conversion, supplies with measuring equipment 39 and gather after opto-electronic conversion, and measuring equipment 39 can be oscillograph etc.The noble potential of VFTC measuring system is measured required power supply and is adopted analog optical fiber to realize by swashing light delivery by earth potential.VFTC measuring system noble potential part has taked good shielding measure to disturb with the electric discharge of opposing contact.
When disconnector 35 operates, no matter power supply is surveyed still load-side is noble potential, measure VFTC, need to isolate noble potential.In order to isolate noble potential, adopt optical fiber to carry out signal transmission, Rogowski coil 36 is output as electric signal, is first converted into light signal (analog quantity) through an optical sender 37, and transmits by optical fiber.At receiving end, light signal is converted into electric signal with a photoreceiver 38, and transmits and enter measuring equipment 39.Optical sender 37 is converted into light signal the electric signal of sensor, and the required power supply of its inner original paper is inputted energy supply by laser.Laser energy supply Emission Lasers, for optical sender 37 provides energy.Signal laser transmits with single-mode fiber, and energy supply laser transmits with multimode optical fiber.The frequency characteristic of Optical Fiber Transmission should meet the demands, and for example, the fibre-optic transmission system (FOTS) that 252kV test platform is adopted carries out frequency sweep test, its flat segments scope is at 10k-20MHz, three dB bandwidth is about 100MHz, and gain is 0.066, substantially can meet current measurement needs.
According to one embodiment of present invention, disconnector 35 contacts can produce very strong electromagnetic radiation while puncturing, it is very near that measuring system noble potential part is left pass fracture, although although Rogowski coil 3 and optical sender are positioned at static contact inside, still can be subject to very large interference.For strengthening shielding, in static contact inside, at Rogowski coil 36 and the outer interpolation metal shielding box of optical sender 37, to remove interference, ensure that VFTC measures accurately reliable.By photoreceiver 38 and laser energy supply device separate packages, photoreceiver 38 adopts powered battery.Use multimode optical fiber that the laser energy supply interface of optical sender 37 is connected with the Laser output interface of the laser energy supply device 38 outside disconnector cavity in GIS.Use single-mode fiber that the signal transmission interface of optical sender 37 is connected with the light signal input interface on photoreceiver 38 outside disconnector cavity in GIS.Can use 50 Ω concentric cable to connect electrical signal output interface on photoreceivers 38 to measuring equipment 39.
Fig. 4 is the process flow diagram of an embodiment of the measuring method of the VFTC according to the present invention.As shown in Figure 4:
Step 402, is used Rogowski coil to measure the very fast transient electric current VFTC that in GIS, the unloaded short bus of disconnector folding produces.
Step 403, arrives measuring equipment by measuring-signal by Optical Fiber Transmission, and adopts laser to provide power supply for carrying out noble potential measurement VFTC by optical fiber.
According to one embodiment of present invention, in GIS, high frequency Rogowski coil is installed at the static contact place of disconnector, the VFTC signal that high frequency Rogowski coil is measured is converted to light signal by optical sender, transmit by optical fiber, light signal is converted into electric signal and is transferred to measuring equipment by photoreceiver at receiving end.Optical sender is enclosed in static contact together with Rogowski coil.Rogowski coil is arranged on the contact tube in static contact, and the signal that VFTC measured by Rogowski coil by optical sender is converted into light signal, by optical fiber, light signal is drawn from GIS.Photoreceiver outside GIS receives light signal, and light signal is converted into electric signal, access measuring equipment.The laser energy supply device being placed in outside GIS is powered to optical sender by energy supply optical fiber.Laser energy supply device and photoreceiver also can be placed in the inside of GIS.In static contact inside, add metal shielding box outward at Rogowski coil and optical sender, by photoreceiver and laser energy supply device separate packages, photoreceiver adopts powered battery.Use multimode optical fiber that the laser energy supply interface of optical sender is connected with the Laser output interface of the laser energy supply device outside disconnector cavity in GIS.Use single-mode fiber that the signal transmission interface of optical sender is connected with the light signal input interface on photoreceiver outside disconnector cavity in GIS.Can use concentric cable, as 50 Ω concentric cable, the electrical signal output interface on connection photoreceiver is to measuring equipment.
Fig. 5 is the schematic diagram of an embodiment of placement sensor coil in static contact of the present invention.The sensitivity of Rogowski coil and bandwidth are determined by amplitude and the frequency of test loop emulation gained VFTC.For example, simulation calculation its VFTC amplitude in 252kV test loop is no more than 4000A, and oscillograph range is 40V, and therefore 0.01V/A is elected in the sensitivity of current sensor as.The main frequency of VFTC is respectively 4MHz, 18MHz, 27MHz, 38MHz and 49MHz, and therefore sensor frequency band is minimum should ensure 4MHz-50MHz.The current sensor adopting is Pearson7355, and its sensitivity is 0.01V/A, is limited to 70MHz in bandwidth.Because the main frequency of VFTC is approximately a few MHz～tens MHz.In the time that static contact isolation switch contact tube is thicker, measure VFTC and must adopt large-sized Rogowski coil, and the bandwidth upper limit of large scale Rogowski coil is generally lower, can not meet measurement requirement.In addition, due to skin effect, VFTC is mainly distributed in conductive surface, and electric current departs from hub of a spool when excessive, can bring larger error to measurement.As shown in Figure 5, static contact 5 makes the thinner electric conductor of electric current stream first quarter, the small size coil Rogowski coil 51 meeting the demands with regard to available bandwidth is like this measured, and the VFTC data of Rogowski coil 51 being measured by optical sender 52 send by optical fiber.Can adopt rubber seal mode to encapsulate the optical fiber of turnover GIS, can make optical fiber and flange all use rubber seal in two holes, between two, use seal with elastometic washer, wait glue thoroughly to solidify laggard row gas pressure test to guarantee impermeability.
According to one embodiment of present invention, Rogowski coil is arranged on the contact tube in static contact.Use multimode optical fiber that the laser energy supply interface of optical sender is connected with the Laser output interface in laser energy supply module outside GIS cavity.Use single-mode fiber that the signal transmission interface of optical sender is connected with the light signal input interface on photoreceiver outside GIS cavity.Electrical signal output interface on 50 Ω concentric cable connection photoreceivers is to oscillograph or other survey record equipment.After determining that system connection is errorless, can carry out the inflation of GIS cavity and test loop line.Test loop is raised to required voltage, carries out divide/closing operation of disconnector, measures and record VFTC.After having tested, trial voltage is down to zero, closes fibre-optic transmission system (FOTS) and oscillograph power supply.
System and method of the present invention utilizes Rogowski coil to measure the VFTC producing in the unloaded short bus process of disconnector folding in GIS, and carry out the transmission of electric power supply and signal by fibre system, solve the inner noble potential of GIS and measured a series of difficult problems such as the required broadband of VFTC, anti-interference, potential isolation, signal transmission, electric power supply.System and method of the present invention can obtain the shape information of VFTC, grasp generation, arcing and the blow-out rule of disconnector hf electric arc, can with VFTO (Very Fast Transient Over-voltage, very fast transient electric current) measure combination, for the research of disconnector arc characteristic and simulation modeling provide test basis.
May realize in many ways method and system of the present invention.For example, can realize method and system of the present invention by any combination of software, hardware, firmware or software, hardware, firmware.The said sequence that is used for the step of method is only in order to describe, and the step of method of the present invention is not limited to above specifically described order, unless otherwise specified.In addition, in certain embodiments, can be also the program being recorded in recording medium by the invention process, these programs comprise the machine readable instructions for realizing the method according to this invention.Thereby the present invention also covers the recording medium of storing the program for carrying out the method according to this invention.
Claims (6)
1. a measuring system of very fast transient electric current VFTC, comprising:
Measurement subsystem, for being used Rogowski coil to measure the VFTC producing in the unloaded short bus process of GIS disconnector folding;
Transmission subsystem, arrives measuring equipment for the VFTC signal that described Rogowski coil is measured by Optical Fiber Transmission;
Laser energy supply device, for adopting laser to provide power supply for described transmission subsystem by optical fiber;
Described transmission subsystem comprises optical sender and photoreceiver;
In described GIS, high frequency Rogowski coil is installed at the static contact place of disconnector, and described optical sender and described Rogowski coil are enclosed in described static contact, and wherein, described Rogowski coil is arranged on the contact tube in described static contact;
The VFTC signal that described optical sender is measured described Rogowski coil is converted into light signal, by optical fiber, described light signal is drawn from GIS; Described photoreceiver outside described GIS receives described light signal, and described light signal is converted to electric signal, accesses described measuring equipment; The described laser energy supply device being placed in outside described GIS is powered to described optical sender by energy supply optical fiber.
2. the system as claimed in claim 1, is characterized in that:
In described static contact inside, add metal shielding box in the outside of described Rogowski coil and optical sender;
By described photoreceiver and described laser energy supply device separate packages, described photoreceiver adopts powered battery.
3. system as claimed in claim 1 or 2, is characterized in that:
Use multimode optical fiber that the laser energy supply interface of described optical sender is connected with the Laser output interface of the described laser energy supply device outside described GIS cavity;
Use single-mode fiber that the signal transmission interface of described optical sender is connected with the light signal input interface on photoreceiver outside described GIS cavity;
Use concentric cable to connect electrical signal output interface and the described measuring equipment on described photoreceiver.
4. a measuring method of very fast transient electric current VFTC, is characterized in that, comprising:
Use Rogowski coil to measure the VFTC producing in the unloaded short bus process of disconnector folding in GIS;
The signal of the VFTC that transmission subsystem is measured described Rogowski coil arrives measuring equipment by Optical Fiber Transmission, and laser energy supply device adopts laser to provide power supply for measuring VFTC by optical fiber; Described transmission subsystem comprises: optical sender and photoreceiver;
In described GIS, high frequency Rogowski coil is installed at the static contact place of disconnector, and described optical sender and described Rogowski coil are enclosed in described static contact, and wherein, described Rogowski coil is arranged on the contact tube in described static contact;
The VFTC signal that described optical sender is measured described Rogowski coil is converted to light signal, by optical fiber, described light signal is drawn from GIS; Described photoreceiver outside described GIS receives described light signal, and described light signal is converted to electric signal, and sends to described measuring equipment; The described laser energy supply device being placed in outside described GIS is powered to described optical sender by energy supply optical fiber.
5. method as claimed in claim 4, is characterized in that:
In described static contact inside, at described Rogowski coil and the outside interpolation of optical sender metal shielding box, and by described photoreceiver and described laser energy supply device separate packages; Described photoreceiver adopts powered battery.
6. the method as described in claim 4 or 5, is characterized in that:
Use multimode optical fiber that the laser energy supply interface of described optical sender is connected with the Laser output interface of the described laser energy supply device outside described GIS;
Use single-mode fiber that the signal transmission interface of described optical sender is connected with the light signal input interface on the external photoreceiver of described GIS lumen;
Use concentric cable to connect electrical signal output interface and the described measuring equipment on described photoreceiver.
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| CN105606872B (en) * | 2016-01-08 | 2018-08-31 | 国家电网公司 | A kind of measurement method of GIS internal high frequencies transient current |
| CN106413370A (en) * | 2016-11-17 | 2017-02-15 | 中国工程物理研究院流体物理研究所 | Optoelectronic isolation shielding box with strong electromagnetic interference resisting performance, system and method |
| CN109374947A (en) * | 2018-09-27 | 2019-02-22 | 南瑞集团有限公司 | It is a kind of not by the electric system high voltage measuring system of electromagnetic interference influence |
| CN109470914A (en) * | 2018-09-30 | 2019-03-15 | 国电南瑞科技股份有限公司 | A kind of VFTO signal measurement apparatus |
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| CN2696184Y (en) * | 2004-04-20 | 2005-04-27 | 西安高研电器有限责任公司 | Electronic combined current sensor |
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| CN2696184Y (en) * | 2004-04-20 | 2005-04-27 | 西安高研电器有限责任公司 | Electronic combined current sensor |
Non-Patent Citations (3)
| Title |
|---|
| JP特开2007-311204A 2007.11.29 * |
| 低功耗rogowski线圈式光电电流互感器的研究;刘艳峰;《中国优秀博硕士学位论文全文数据库 (硕士) 工程科技Ⅱ辑》;20070314;2,34-39 * |
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