CN101393255B - Verifying apparatus for zinc oxide arrester tester - Google Patents

Verifying apparatus for zinc oxide arrester tester Download PDF

Info

Publication number
CN101393255B
CN101393255B CN2008101975501A CN200810197550A CN101393255B CN 101393255 B CN101393255 B CN 101393255B CN 2008101975501 A CN2008101975501 A CN 2008101975501A CN 200810197550 A CN200810197550 A CN 200810197550A CN 101393255 B CN101393255 B CN 101393255B
Authority
CN
China
Prior art keywords
voltage
output
current
precision
accurate
Prior art date
Application number
CN2008101975501A
Other languages
Chinese (zh)
Other versions
CN101393255A (en
Inventor
张军
雷民
章述汉
项琼
王斯琪
陈习文
Original Assignee
国网电力科学研究院
华东电网有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 国网电力科学研究院, 华东电网有限公司 filed Critical 国网电力科学研究院
Priority to CN2008101975501A priority Critical patent/CN101393255B/en
Publication of CN101393255A publication Critical patent/CN101393255A/en
Application granted granted Critical
Publication of CN101393255B publication Critical patent/CN101393255B/en

Links

Abstract

The invention discloses a checking apparatus for a zinc oxide lightening arrester tester. The checking device comprises a controller, signal generation modules, precision current source modules, reference voltage circuit signal conditioning modules, precision four-terminal resistors and precision voltage transformers. Under the control of the controller, each signal generation module generates an independent highly-smooth sinusoidal signal with adjustable amplitude, frequency and phase angle. The sinusoidal signals excite the independent precision current source modules, reference voltage circuit signal conditioning modules, and precision voltage transformers in the next stage, to generate independent current components and voltage component driving signals; the current components are directly and parallelly connected and superposed to supply full current output; the current component signals drives the secondary sides of the voltage transformers to be connected parallelly to superpose voltage components to supply reference voltage output. The checking apparatus can achieve highly-accurate check of the main measuring functions of the zinc oxide lightening arrester tester such as measurement of full current, resistance current, capacity current, reference voltage, phase angle, harmonic wave component, etc.

Description

A kind of verifying apparatus for zinc oxide arrester tester

Technical field

The present invention relates to a kind of verifying apparatus for zinc oxide arrester tester; The calibration, calibrating and the detection range that belong to the power test instrument; Utilizing this calibration equipment can be that measurement functions such as total current, current in resistance property, capacity current, reference voltage, phase angle, harmonic component carry out the verification of pin-point accuracy to the main measurement function of zinc oxide arrester tester, and each the substandard voltage that is produced, normalized current signal all can be synchronously, convenient, effectively carry out magnitude tracing.

Background technology

Along with Zinc-Oxide Arrester is widely used, the security of electric system is greatly improved.But because the Zinc-Oxide Arrester work under bad environment is easy to generate phenomenons such as aging, so Zinc-Oxide Arrester is regularly detected very necessary.In light of this situation, domestic a lot of power test instrument manufacturing firm begins development, produces zinc oxide arrester tester.But according to investigations, the zinc oxide arrester tester quality on the home market is uneven, and this class testing appearance is carried out verification and provides reliable checking data that the quality that improves preventive trial is had positive effect to the user.In " DL/T 987-2005 zinc oxide lightning arrester block property current tester general technical specifications ", explicitly call for measurement functions such as total current to zinc oxide arrester tester, current in resistance property, capacity current to detect.

Know that according to the applicant method of present domestic relevant technologies unit verification zinc oxide arrester tester mainly comprises: traditional RC resistance-capacitance network method and common standard signal source method, deficiency is respectively arranged, make a concrete analysis of as follows:

Wherein, Traditional RC resistance-capacitance network method; Its principle is: under the excitation of power-frequency voltage (being reference voltage); The current signal (being total current) that configuration generation and reference voltage through resistance-capacitance network has certain phase differential, the reference voltage of generation and total current can be used for zinc oxide arrester tester is carried out verification.The deficiency of this method is: the measuring resistance of using in the loop, standard capacitance are affected by environment bigger, and wiring is loaded down with trivial details, complicated operation; Influence to measurement result is bigger; And test data is single, and the phase angle problem is difficult for solving, and the necessary harmonic voltage harmonic electric current of verification work can't produce; And influenced by test product and cause standard value to change greatly, and then influence is to the calibration result of zinc oxide arrester tester

Wherein, common standard signal source method, its principle is: utilize technology such as electronic circuit, produce standard signal source and promptly directly provide one road reference voltage signal and one tunnel full current signal, in order to zinc oxide arrester tester is carried out verification.Reference voltage and the total current of utilizing this method to produce can realize containing each harmonic voltage harmonic current component basically.The deficiency of this method is: only the magnitude tracing of the calibration equipment through the design of this thinking itself is difficult to be guaranteed; During such as the total current of taking common standard signal source method to provide; Parameters such as the amplitude of each harmonic electric current, phase place, frequency are difficult to tracing to the source of pin-point accuracy; Briefly be exactly to be difficult to obtain checking; Its reason is: these harmonic current components are included in the total current; Can only calculating when these components are traced to the source through signal analysis (such as Fourier transform etc.) means " indirectly "; The calculating of this " indirectly " or leaching process can reduce trace to the source result's confidence level of harmonic current components undoubtedly, and its result is exactly the good traceability that causes being difficult to guarantee based on the design proposal of the verifying apparatus for zinc oxide arrester tester of this method each harmonic current component in the total current, and just whether clear hardly the amplitude of each harmonic current component, phase place, frequency be accurately on earth; In like manner, when the reference voltage that provides based on the common standard signal source contained harmonic voltage, parameters such as the amplitude of each harmonic voltage, phase place, frequency were difficult to tracing to the source of pin-point accuracy.

In sum; But all there are deficiency at present domestic calibration equipment and method of calibration that can reference on principle of work and traceability; Accuracy can not meet the demands; The limits of error of a large amount of zinc oxide arrester tester nominals only reach amplitude measurement 0.5% on the market, about 0.2 ° of measurement of angle, but be badly in need of the verifying apparatus for zinc oxide arrester tester that design has good traceability; High and the verifying apparatus for zinc oxide arrester tester that can effectively be verified of accuracy just satisfies the urgent needs of present verification work.

Summary of the invention

The objective of the invention is to the deficiency on the existing verifying apparatus for zinc oxide arrester tester design concept; Especially but the deficiency of calibration equipment on traceability improved; A kind of verifying apparatus for zinc oxide arrester tester is provided, but has good traceability, and improve checking precision.

To achieve these goals; Technical scheme of the present invention provides a kind of verifying apparatus for zinc oxide arrester tester; Form by controller, signal generator module, precision current source module, reference voltage loop signal conditioning module, accurate four-terminal resistance, accurate voltage mutual inductor; It is characterized in that: the output control signal of controller connects the control end of 5 signal generator modules respectively; Wherein there is the output of 3 signal generator modules to connect the input of corresponding 3 precision current source modules respectively; 3 precision current source modules are exported corresponding current component through corresponding 3 accurate four-terminal resistances respectively, and each current component stack of parallel connection back provides total current output, wherein have the output of 2 signal generator modules to connect the input of corresponding 2 reference voltage loop signal conditioning module respectively; The output of 2 reference voltage loop signal conditioning module is connected with corresponding 2 former limits of accurate voltage mutual inductor respectively; Through coupling, the secondary of 2 accurate voltage mutual inductors is exported the correspondent voltage component respectively, and the component of voltage stack provided reference voltage output after the secondary of 2 accurate voltage mutual inductors was in series.

Its principle of work is: under the control action of controller; Each signal generator module can produce amplitude independently, frequency, the level and smooth sinusoidal signal unit of height that phase angle is adjustable; These sinusoidal signal unit can independently precision current source module, reference voltage loop signal conditioning module, accurate voltage mutual inductor encourage separately to the back level; Thereby form separate each primary current component and component of voltage drive signal; And each primary current component is through direct parallelly connected addition; Finally synthetic and output contains the total current of each harmonic component, and the component of voltage drive signal then is coupled through driving accurate voltage mutual inductor, and the final output of its secondary series connection phase adduction contains the reference voltage of each harmonic component.

Aforesaid verifying apparatus for zinc oxide arrester tester; It is characterized in that: signal generator module is taked the circuit based on DDS chip AD9951, comes to produce easily that frequency stabilization is adjustable, amplitude stability is adjustable, phase stabilization is adjustable and the level and smooth stable sinusoidal signal of height of curve with the Direct Digital synthetic technology of DDS chip.

Secondly, the present invention has also adopted following core technology in design:

1, the sinusoidal signal generation module of the adjustable and curve smoothing of amplitude, frequency and phase stabilization

In order to reach the verification purpose of pin-point accuracy, at first need generate some basic sinusoidal signal unit, these sinusoidal signal unit will be used for encouraging rearmounted current source circuit and constant voltage power supply circuit and producing the corresponding standard reference voltage and the standard total current.In order at first to obtain the sinusoidal signal unit of the adjustable and curve smoothing of amplitude and frequency stabilization, having taked the Direct Digital synthetic technology is that the DDS chip produces sinusoidal signal.The Direct Digital synthetic technology is mainly taked more at present in the high-frequency signal field, use also less in field of electrical testing.Its principal feature is based on the Direct Digital blending theory; Proposed sinusoidal signal (or any period waveform) the generation way that a kind of frequency can change at a high speed, this technical application can produce easily in the present invention that frequency stabilization is adjustable, amplitude stability is adjustable, phase stabilization is adjustable and the level and smooth stable sinusoidal signal of height of curve.Wherein: the frequency of sinusoidal signal also can be configured to the each harmonic frequency easily except can be the 50Hz first-harmonic, and highly stable; The amplitude resolution of sinusoidal signal can reach 14, satisfies needs of the present invention; Though the more important thing is that the sinusoidal signal curve is still for discretize; But the refresh interval of curve amplitude is less than 1us; Very level and smooth; Can't see " ladder " through ordinary oscilloscope, the effect of this " height of curve is level and smooth " can be avoided taking follow-up filtering circuit fully, thus the negative effect of amplitude that the filtering circuit that significantly reduces brings and phase place.

2, the mode that " module " changed has been taked in the design of precision current source circuit and reference voltage loop signal modulate circuit

The mode that the present invention has taked " module " to change in design to the precision current source circuit and the reference voltage loop signal modulate circuit of core.The input signal that is each precision current source module or reference voltage loop signal conditioning module is a sinusoidal signal that independence is pure; This signal is the DDS chip from direct digital synthesis circuit; Under the excitation of the adjustable sinusoidal signal of amplitude-frequency independently; Each precision current source module or reference voltage loop signal conditioning module can be exported electric current, the component of voltage of different amplitudes, frequency, phase place respectively, and these electric currents, current component can be used as each component of total current and reference voltage, and each precision current source module has been chosen high performance device; Near the infinitely-great ideal current source requirement of output impedance; And based on the characteristics of output impedance approach infinity, these precision current source modules directly parallel connection reach the purpose of current summation with synthetic full current signal.Reference voltage loop signal conditioning module is also directly connected and is synthesized the reference voltage signal simultaneously.Change thought based on this " module "; The present invention has formed following characteristics: in output total current and reference voltage, can each primary current component and component of voltage be drawn respectively; This mode helps when this calibration equipment goes superior unit to trace to the source, can under the background of output total current and reference voltage, drawing each primary current component and component of voltage simultaneously as required; Just can " synchronously " amplitude, frequency, the phase place of any harmonic component be traced to the source; Improve the result's that traces to the source validity greatly, guaranteed the accuracy of the each harmonic component that this calibration equipment produces.

3, taked accurate voltage mutual inductor in the design of precision voltage source

The present invention has made former limit low pressure, the high-accuracy voltage mutual inductor of secondary high pressure specially when the output reference voltage.Avoided the deficiency of utilizing the high-voltage power amplifier to boost through this way of output.

The invention has the beneficial effects as follows; Use this verifying apparatus for zinc oxide arrester tester; Can be that measurement functions such as total current, current in resistance property, capacity current, reference voltage, phase angle, harmonic component carry out the verification of pin-point accuracy to the main measurement function of zinc oxide arrester tester, and each the substandard voltage that is produced, normalized current signal all can be synchronously, convenient, effectively carry out magnitude tracing.And important feature is that each time voltage, current component all can trace to the source through corresponding loop " synchronously " at synchronization, verifies its accuracy.

Description of drawings

Fig. 1 is traditional verifying apparatus for zinc oxide arrester tester principle schematic based on the standard signal source method.

Fig. 2 is the verifying apparatus for zinc oxide arrester tester theory diagram of the embodiment of the invention.

Fig. 3 .1 is the circuit theory diagrams of Fig. 2 middle controller.

Fig. 3 .2 is the circuit theory diagrams of one road signal generator module among Fig. 2.

Fig. 3 .3 is one road precision current source module circuit theory diagrams among Fig. 2.

Fig. 3 .4 is the circuit theory diagrams of one road reference voltage loop signal conditioning module and accurate voltage mutual inductor among Fig. 2.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is done further explanation.

Mark among the figure: 1-controller, 21,22,23,24, the 25-signal generator module, 31,32,33-precision current source module, 34,35-reference voltage loop signal conditioning module, 41,42, the accurate four-terminal resistance of 43-, 54, the 55-accurate voltage mutual inductor, Ia 1, Ia 2, Ia 3-current component, Ua 1, Ua 2-component of voltage, I-total current, U-reference voltage.

Referring to traditional verifying apparatus for zinc oxide arrester tester principle schematic shown in Figure 1, be the circuit diagram of an electricity based on the standard signal source method.Reference voltage U and total current I that it utilizes this calibration equipment to produce can realize containing each harmonic voltage harmonic current component basically.The deficiency of this method is: only the magnitude tracing of the calibration equipment through the design of this thinking itself is difficult to be guaranteed; Can only be when its component is traced to the source through the calculating of signal analysis (such as Fourier transform etc.) means " indirectly ", the calculating of this " indirectly " or leaching process can reduce trace to the source result's confidence level of harmonic component undoubtedly.

Referring to the verifying apparatus for zinc oxide arrester tester schematic diagram of the embodiment of the invention shown in Figure 2, this is the related circuit of an electricity.The control end that connects signal generator module 21,22,23,24,25 by the output control signal of controller 1; The output of signal generator module 21,22,23 connects the input of corresponding precision current source module 31,32,33 respectively, and the output of precision current source module 31,32,33 produces output current component Ia through accurate four-terminal resistance 41,42,43 respectively 1, Ia 2, Ia 3, parallel connection stack back produces total current I output.The output of signal generator module 24,25 connects the input of corresponding reference voltage loop signal conditioning module 34,35 respectively; The output terminal of reference voltage loop signal conditioning module 34,35 is connected with accurate voltage mutual inductor 54,55 former limits respectively; Through coupling, accurate voltage mutual inductor 54 secondary produce component of voltage output Ua 1, accurate voltage mutual inductor 55 secondary produce component of voltage output Ua 2, two accurate voltage mutual inductor 54,55 secondary are in series and make each output voltage U a 1, Ua 2Stack provides reference voltage U output.

Its principle of work is: under the control action of controller 1 (being specially single-chip microcomputer C8051F020); Each signal generator module 21,22,23,24,25 (is realized based on DDS chip AD9951; Referring to Fig. 3 .2) can produce amplitude independently, frequency, the level and smooth sinusoidal signal unit of height that phase angle is adjustable; These sinusoidal signal unit can to back level separately independently precision current source module 31,32,33 (constitute based on accurate amplifier OPA228 chip; Referring to Fig. 3 .3), reference voltage loop signal conditioning module 34,35 (constitutes based on precise high-voltage amplifier OPA454 chip; Referring to Fig. 3 .4), accurate voltage mutual inductor 54,55 encourages, thereby forms each separate primary current component Ia 1, Ia 2, Ia 3With component of voltage Ua 1, Ua 2Drive signal, and each primary current component Ia 1, Ia 2, Ia 3Through direct parallelly connected addition, finally synthetic and output contains the total current I of each harmonic component, and component of voltage Ua 1, Ua 2Drive signal is then through driving the reference voltage U that the final output of accurate voltage mutual inductor 54,55 series connection phase adductions contains the each harmonic component.

In the present embodiment, signal generator module 21,22,23,24,25 has taked to produce easily based on the Direct Digital synthetic technology of DDS chip that frequency stabilization is adjustable, amplitude stability is adjustable, phase stabilization is adjustable and the level and smooth stable sinusoidal signal of height of curve.

In the present embodiment, in design, take the mode of " modular superimposition ", adopted precision current source module 31,32,33 and reference voltage loop signal conditioning module 34,35.

In the present embodiment, for fear of the deficiency of utilizing the high-voltage power amplifier to boost, in design, taked to export reference voltage through accurate voltage mutual inductor 54,55.

Claims (1)

1. verifying apparatus for zinc oxide arrester tester is by 1 controller (1), 5 signal generator modules (21,22,23,24; 25), 3 precision current source modules (31,32,33), 2 reference voltage loop signal conditioning module (34,35), 3 accurate four-terminal resistances (41,42; 43), 2 accurate voltage mutual inductors (54,55) form, it is characterized in that: the output control signal by controller (1) connects 5 signal generator modules (21,22,23; 24,25) control end wherein has 3 signal generator modules (21,22; 23) output connects the input of corresponding 3 precision current source modules (31,32,33), 3 precision current source modules (31 respectively; 32,33) output produces output current component Ia through 3 accurate four-terminal resistances (41,42,43) respectively 1, Ia 2, Ia 3, parallel connection stack back produces total current I output, and 2 signal generator modules (24 are wherein arranged; 25) output connects the input of 2 corresponding reference voltage loop signal conditioning module (34,35) respectively, 2 reference voltage loop signal conditioning module (34; 35) output terminal respectively with 2 accurate voltage mutual inductors (54; 55) former limit is connected, and through coupling, accurate voltage mutual inductor (54) secondary produces component of voltage output Ua 1, accurate voltage mutual inductor (55) secondary produces component of voltage output Ua 2, two accurate voltage mutual inductors (54,55) secondary is in series and makes each output voltage U a 1, Ua 2Stack provides reference voltage U output;
Signal generator module (21,22,23,24,25) takes the circuit based on the DDS chip, obtained the sinusoidal signal generation module of the adjustable and curve smoothing of amplitude, frequency and phase stabilization;
The mode that the design of precision current source circuit and reference voltage loop signal modulate circuit has taked " module " to change;
Taked accurate voltage mutual inductor in the design of precision voltage source.
CN2008101975501A 2008-11-07 2008-11-07 Verifying apparatus for zinc oxide arrester tester CN101393255B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008101975501A CN101393255B (en) 2008-11-07 2008-11-07 Verifying apparatus for zinc oxide arrester tester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2008101975501A CN101393255B (en) 2008-11-07 2008-11-07 Verifying apparatus for zinc oxide arrester tester

Publications (2)

Publication Number Publication Date
CN101393255A CN101393255A (en) 2009-03-25
CN101393255B true CN101393255B (en) 2012-06-27

Family

ID=40493642

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2008101975501A CN101393255B (en) 2008-11-07 2008-11-07 Verifying apparatus for zinc oxide arrester tester

Country Status (1)

Country Link
CN (1) CN101393255B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102707253A (en) * 2012-07-03 2012-10-03 宁夏电力公司电力科学研究院 Verifying unit of zinc oxide arrester tester

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101887073B (en) * 2009-05-13 2012-07-25 武汉特试特电气有限公司 High voltage power supply for direct current characteristics test of zinc oxide arrester
CN102323558B (en) * 2011-05-30 2014-07-02 中国西电电气股份有限公司 Device and method for calibrating valve direct current residual voltage parameter tester of zinc oxide arrester
CN102854431B (en) * 2011-07-01 2014-11-19 上海思盛信息科技事务所 Method for online detecting leakage resistive current of lightning arrestor
CN102495316B (en) * 2011-12-08 2014-04-16 中国西电电气股份有限公司 Harmonic characteristic test device for direct current arrester
CN102539963B (en) * 2011-12-21 2014-04-23 南阳金冠电气有限公司 Method for selecting equivalent continuous operating voltage of lightning arrester at harmonic voltage
CN103116150A (en) * 2013-01-30 2013-05-22 中国电力科学研究院 Verifying device of insulated online monitoring equipment of oxide arrester
CN103543424A (en) * 2013-10-24 2014-01-29 国家电网公司 Online monitoring device calibrating method for lightning arrester
CN104698256A (en) * 2015-03-26 2015-06-10 国网上海市电力公司 Filtering method of clip-on resistive current transformer
CN104808166B (en) * 2015-05-18 2018-02-06 国网上海市电力公司 A kind of calibration method and its calibrating installation for current in resistance property measurement
CN107861081A (en) * 2017-06-16 2018-03-30 中国南方电网有限责任公司超高压输电公司广州局 A kind of valve arrester performeter checking instrument
CN109901460A (en) * 2018-12-19 2019-06-18 北京航天计量测试技术研究所 A kind of calibration system of II grades of rolling control unit testing instrument

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2225102Y (en) * 1995-02-17 1996-04-17 邯郸市邯山电力自动化研究所 Ground compensator of automatic tracking and regulating arc-extinguishing coil
CN2482097Y (en) * 2001-06-01 2002-03-13 盐城供电局 Checking apparatus for zinc oxide lightning arrester in-line monitoring device
US20040175643A1 (en) * 2003-03-07 2004-09-09 Yoshinobu Baba Toner and two-component developer
CN1877355A (en) * 2005-10-14 2006-12-13 安徽省电力科学研究院 Insulated on-line monitoring system checker of high-voltage electric equipment
CN2890936Y (en) * 2006-04-30 2007-04-18 福建省方星电气有限公司 Non-residual voltage online detection counter
CN201289525Y (en) * 2008-11-07 2009-08-12 国网武汉高压研究院 Checkout device for zinc oxide lightning arrester tester

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2225102Y (en) * 1995-02-17 1996-04-17 邯郸市邯山电力自动化研究所 Ground compensator of automatic tracking and regulating arc-extinguishing coil
CN2482097Y (en) * 2001-06-01 2002-03-13 盐城供电局 Checking apparatus for zinc oxide lightning arrester in-line monitoring device
US20040175643A1 (en) * 2003-03-07 2004-09-09 Yoshinobu Baba Toner and two-component developer
CN1877355A (en) * 2005-10-14 2006-12-13 安徽省电力科学研究院 Insulated on-line monitoring system checker of high-voltage electric equipment
CN2890936Y (en) * 2006-04-30 2007-04-18 福建省方星电气有限公司 Non-residual voltage online detection counter
CN201289525Y (en) * 2008-11-07 2009-08-12 国网武汉高压研究院 Checkout device for zinc oxide lightning arrester tester

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102707253A (en) * 2012-07-03 2012-10-03 宁夏电力公司电力科学研究院 Verifying unit of zinc oxide arrester tester

Also Published As

Publication number Publication date
CN101393255A (en) 2009-03-25

Similar Documents

Publication Publication Date Title
Leferink et al. Static energy meter errors caused by conducted electromagnetic interference
CN102073029B (en) Electronic mutual inductor test system and test method
CN100394199C (en) Direct current sensor
CN102650685B (en) Method for assessing technical parameters of TEV (Transient Earth Voltage) partial discharge testing instruments for power systems
CN101865986B (en) System and method for checking error of high-voltage electric energy measurement device
CN101149425B (en) Electronic electric energy meter debugging, checkout automated system
CN103424732B (en) A kind of direct-current electric energy meter calibrating device
CN201444193U (en) Comprehensive error detection device used for digital electric energy measuring device
CN101915903B (en) Power meter calibrating system and power meter calibrating method for intelligent electric meter
CN103513211B (en) Ac impedance measurement measuring device
CN101706535B (en) Device and method for testing dielectric loss of high voltage transformer
CN104569902B (en) Digital type electric energy meter power consumption measuring device and method
CN105203983B (en) Flexible alterating and direct current minor mutual-inductor calibration device based on mixing sampling
CN101441231B (en) Harmonic electric energy metering error analytical apparatus
CN101655544A (en) Device for measuring and checking errors of digital mutual inductor
CN104267368B (en) A kind of current transformer for metering secondary circuit failure monitoring method
CN201425621Y (en) Error checking system of high-voltage electric energy metering device
CN104062625A (en) Digital electric energy metering device calibration equipment and method thereof
CN103698695A (en) Multifunctional electrical characteristic testing device and testing method for high-voltage circuit breaker
CN102269787B (en) Detection method of harmonic characteristic of electronic voltage transformer and detection device thereof
CN200962142Y (en) High-voltage power meter correction device
CN102072999B (en) Connection testing device of electric energy metering device and using method thereof
CN101770005A (en) DC electronic transformer calibration device and method
CN204666727U (en) Based on the large ground network footing impedance measuring apparatus of GPS
CN102012494B (en) Transformer calibrator and calibration method thereof

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
ASS Succession or assignment of patent right

Owner name: STATE NETWORK ELECTRIC POWER RESEARCH INSTITUTE

Free format text: FORMER OWNER: WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID

Effective date: 20091218

TA01 Transfer of patent application right

Effective date of registration: 20091218

Address after: Nanjing City, Jiangsu Province, South ruilu No. 8 post encoding: 210003

Applicant after: Power Science Research Institute of national network

Co-applicant after: Huadong Electric Network Co., Ltd.

Address before: Hubei province Wuhan city Hongshan District Luoyu Road No. 143 post encoding: 430074

Applicant before: Guowang Wuhan High Voltage Inst

C41 Transfer of patent application or patent right or utility model
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120627

Termination date: 20131107