CN107271942A - Great current mutual inductor site error verification mobile laboratory - Google Patents

Great current mutual inductor site error verification mobile laboratory Download PDF

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Publication number
CN107271942A
CN107271942A CN201710399869.1A CN201710399869A CN107271942A CN 107271942 A CN107271942 A CN 107271942A CN 201710399869 A CN201710399869 A CN 201710399869A CN 107271942 A CN107271942 A CN 107271942A
Authority
CN
China
Prior art keywords
mobile laboratory
mutual inductor
current
power supply
current mutual
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN201710399869.1A
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Chinese (zh)
Inventor
许灵洁
沈建良
孙军
陈骁
郭鹏
张卫华
周琦
胡利峰
周瑞文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WUHAN PANDIAN TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
Original Assignee
WUHAN PANDIAN TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd
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 WUHAN PANDIAN TECHNOLOGY Co Ltd, State Grid Corp of China SGCC, Electric Power Research Institute of State Grid Zhejiang Electric Power Co Ltd filed Critical WUHAN PANDIAN TECHNOLOGY Co Ltd
Priority to CN201710399869.1A priority Critical patent/CN107271942A/en
Publication of CN107271942A publication Critical patent/CN107271942A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H1/00Buildings or groups of buildings for dwelling or office purposes; General layout, e.g. modular co-ordination or staggered storeys
    • E04H1/12Small buildings or other erections for limited occupation, erected in the open air or arranged in buildings, e.g. kiosks, waiting shelters for bus stops or for filling stations, roofs for railway platforms, watchmen's huts or dressing cubicles
    • E04H1/1205Small buildings erected in the open air
    • E04H1/1238Shelters for engines, e.g. electrical meter housings

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The invention discloses a kind of great current mutual inductor site error verification mobile laboratory.The mobile laboratory of the present invention includes current mutual inductor on site verification complexes, integrated form operating system, experimental enviroment monitoring system and safety monitoring system, and the current mutual inductor on site verification complexes and integrated form operating system are arranged in mobile laboratory.The present invention solve in great current mutual inductor site error checking procedure because labor intensity is big, the cumbersome operating efficiency caused of equipment operation is low, the problem of level of security is low, it is high with device integration, operating efficiency is high, in power plant, equipment is without getting off when substation field carries out large current transducer check, it is not used in on-site hoisting, without building pilot system temporarily, advantage easy to operate, so that it is guaranteed that current mutual inductor on site verifying work is safe and orderly, error check result is reproducible, the degree of accuracy is high, ensure the accuracy and reliability of national transmission of quantity value.

Description

Great current mutual inductor site error verification mobile laboratory
Technical field
The present invention relates to power equipment error checking arrangement field, specifically a kind of great current mutual inductor site error Verification mobile laboratory.
Background technology
Because the large-scale production and exchange of electric energy in power system are related to the tremendous economic interests of all departments, power plant and electricity Be intended to settle accounts by electric energy tariff between net, between networking lines, between power network and large user, high-voltage electric-energy meter it is accurate Property and reliability also turn into each side be concerned about focal issue.Electric power meter is by high-tension current, voltage transformer, electric energy meter With secondary circuit composition.Wherein, current transformer and voltage transformer are to undertake the work(such as measurement, metering, protection in power system The power equipment of energy, quantity is more, influences big to power grid security economical operation.In order to ensure transformer equipment is in serviceable condition, Except requiring that its insulation can be outer, it is necessary to ensure that measurement error meets its accurate rank, its accuracy directly influences electric power Market it is fair and just.According to JJG1021-2007《Electric power mutual-inductor》National metrological verification regulations provide, except need into Row examines and determine outer first, also periodically should carry out on-site proving to transformer and be traced to the source with national standard to ensure its accuracy.
Existing great current mutual inductor on-site calibration device is generally separate structure, there is problems with:
(1)Testing equipment volume is big, weight weight, equipment are scattered, and it is big to transport and build pilot system workload, frequently entrucking, Unload, lift and certain damage is easily caused to testing equipment;
(2)Wiring workload is big, complicated during experiment, and operating efficiency is not high, requires high to testing crew;
(3)Testing equipment is put and safe spacing requirement test site is big, and experiment security risk is big;Pilot system is built in lifting Add the risk of experiment;
(4)Experiment automatized degree is relatively low.
The content of the invention
The technical problems to be solved by the invention are that there is provided a kind of high current is mutual for the defect that overcomes above-mentioned prior art to exist Sensor site error verification mobile laboratory, its device integration is high, and operating efficiency is high, is opened in power plant, substation field Equipment is without getting off, being not used in on-site hoisting and without building pilot system temporarily when opening up large current transducer check, with simplicity Operation, improves security and the degree of accuracy.
Therefore, the present invention is adopted the following technical scheme that:A kind of great current mutual inductor site error verification is tested with mobile Room, the mobile laboratory includes current mutual inductor on site verification complexes, integrated form operating system, experimental enviroment monitoring system System and safety monitoring system, the current mutual inductor on site verification complexes and integrated form operating system are arranged in mobile experiment It is indoor.
The present invention is in use, the mobile laboratory is placed on truck.
On the basis of above-mentioned technical proposal, the current mutual inductor on site verification complexes include current lifting device, standard Current transformer, Intelligent transformator tester, switch board, disconnecting link cabinet, electronic power supply and multiple accessory cases;
Layering sets electrician's power supply, capacitive compensation device and current loading case successively in the switch board;
The multiple accessory case includes power wire coil cabinet, high current wire case and Tool Cabinet;
The standard current transformer, current loading case and Intelligent transformator tester composition current transformer error of measurement system;
The unlatching of the disconnecting link cabinet control electronic power supply and electrician's power supply, the capacitive compensation device, current lifting device and Current Mutual Inductance Device error of measurement system is sequentially connected, and the current lifting device and standard current transformer are connected by high current wire.
On the basis of above-mentioned technical proposal, the integrated form operating system includes integrated form operating desk and is embedded in integrated form Man-machine interaction giant-screen on operating desk.
On the basis of above-mentioned technical proposal, the experimental enviroment monitoring system includes being separately positioned on mobile laboratory The warm and humid supervising device in inside and outside portion, the temperature-humidity signal of warm and humid supervising device is sent to man-machine interaction giant-screen.
On the basis of above-mentioned technical proposal, the safety monitoring system include laboratory illuminator, monitoring system and Acoustooptic alarm system, the laboratory illuminator, monitoring system and acoustooptic alarm system are connected with disconnecting link cabinet.
On the basis of above-mentioned technical proposal, the laboratory illuminator includes being arranged on the field at the top of mobile laboratory Interior illuminator inside ground lighting device and mobile laboratory.
On the basis of above-mentioned technical proposal, the monitoring system includes being arranged on four open airs at the top of mobile laboratory Type high-definition camera, the monitoring signal of the high-definition camera is sent to the real-time display platform of four split screens, and four split screen is real-time Display platform hangs on the top of integrated form operating desk.
On the basis of above-mentioned technical proposal, the acoustooptic alarm system includes being arranged on the warning at the top of mobile laboratory The caution bell of lamp and mobile laboratory's exterior lateral sides, the control line of the acoustooptic alarm system is connected with integrated form operating desk.
On the basis of above-mentioned technical proposal, the both sides of the mobile laboratory are respectively provided with wiring window;
The wiring window includes external power supply input, experiment power supply output end, current lifting device output end and the secondary company of transformer Line incoming end;
The external power supply input connects disconnecting link cabinet, the output end and electrician's power supply of experiment power supply output end connection electronic power supply Output end, current lifting device output end connection current lifting device first winding, transformer secondary line incoming end connection Intelligent transformator school Test instrument and current loading case.
On the basis of above-mentioned technical proposal, damping and slide-prevention silicagel pad is laid in the mobile laboratory bottom.
Compared with prior art, the device have the advantages that as follows:
All devices are not required to get off during present invention verification, are built without the assembling for carrying out pilot system, it is only necessary to outdoor in experiment After simple wiring, operating personnel can complete all verifying works in mobile laboratory, improve operating efficiency, ensure behaviour Make the personal safety of personnel;Meanwhile, the present invention is provided with supervising device and acoustic-optic alarm, has ensured the safety of experiment;Moreover, Whole movable detecting platform is safe and reliable without hydraulic machinery motion.In addition, requirement of the present invention to haulage vehicle and driver Not high, management cost is low, is adapted to promote the use of in great current mutual inductor field-checking.
Therefore, the present invention has device integration high, and operating efficiency is high, and high current is carried out in power plant, substation field Equipment is without getting off, being not used in on-site hoisting, without building pilot system, easy to operate, security temporarily during transducer check The high, advantage that error check result is reproducible, the degree of accuracy is high.
Brief description of the drawings
Fig. 1 is the inside top figure of great current mutual inductor site error verification of embodiment of the present invention mobile laboratory;
Fig. 2 is the dimensional structure diagram of great current mutual inductor site error verification of embodiment of the present invention mobile laboratory;
Fig. 3 is the front view of the great current mutual inductor site error verification mobile laboratory of the embodiment of the present invention;
Fig. 4 is the structured flowchart of the great current mutual inductor site error verification of the embodiment of the present invention.
Reference:1- switch boards, 2- integrated form operating desks, 3- man-machine interaction giant-screens, 4- current lifting devices, 5- normalized currents Transformer, 6- Intelligent transformator testers, 7- disconnecting link cabinets, 8- power wire coil cabinets, 9- high current wire casees, 10- electronic power supplies, 11- Tool Cabinets, 12- warning lamps, 13- high-definition cameras, 14- caution bells, 15- field lightings device, 16- wiring windows, 17- subtracts Shake anti-skidding silicagel pad, 18- electrician's power supply, 19- capacitive compensation devices, 20- current loading casees, 21- current transformer error of measurement systems, 22- laboratories illuminator, 23- monitoring systems, 24- acoustooptic alarm systems.
Embodiment
With reference to Figure of description and embodiment, the present invention is described in further detail.
The embodiment of the present invention provides a kind of great current mutual inductor site error verification mobile laboratory, and mobile laboratory is put Put on truck, mobile laboratory includes current mutual inductor on site verification complexes, integrated form operating system, proving ring Border monitoring system and safety monitoring system, current mutual inductor on site verification complexes and integrated form operating system are arranged in movement In laboratory.
As shown in figure 1, current mutual inductor on site verification complexes include current lifting device 4, standard current transformer 5, intelligence Mutual-inductor tester 6, switch board 1, disconnecting link cabinet 7, electronic power supply 10 and multiple accessory cases;Wherein, layering is set successively in switch board 1 Put electrician's power supply 18, capacitive compensation device 19 and current loading case 20;Multiple accessory cases, which include power wire coil cabinet 8, high current, leads Line case 9 and Tool Cabinet 11.Current lifting device 4 is placed on the lower section of integrated form operating desk 2, and Intelligent transformator tester 6 is placed on current lifting device 4 On.Integrated form operating system includes integrated form operating desk 2 and the man-machine interaction giant-screen 3 being embedded on integrated form operating desk 2.
Wherein, experimental enviroment monitoring system includes being separately positioned on the warm and humid supervising device in inside and outside portion of mobile laboratory, temperature The temperature-humidity signal of wet supervising device is sent to man-machine interaction giant-screen 3, is easy to monitoring and record experimental enviroment situation, such as tests Environment can suspend experiment in time when being unsatisfactory for vertification regulation regulation.
As shown in Figure 2 and Figure 3, safety monitoring system includes laboratory illuminator 22, monitoring system 23 and sound and light alarm system System 24, laboratory illuminator 22, monitoring system 23 and acoustooptic alarm system 24 are connected with disconnecting link cabinet 7.
Laboratory illuminator 22 includes being arranged on field lighting device 15 and the mobile laboratory at the top of mobile laboratory Internal interior illuminator.
Monitoring system 23 includes being arranged on four outdoor type high-definition cameras 13 at the top of mobile laboratory, high-definition camera 13 monitoring signal is sent to the real-time display platform of four split screens, is easy to viewing test environment, the real-time display platform suspension of four split screens In the top of integrated form operating desk 2.
Acoustooptic alarm system 24 includes being arranged on the warning lamp 12 and mobile laboratory's exterior lateral sides at the top of mobile laboratory Caution bell 14, the control line of acoustooptic alarm system 24 is connected with integrated form operating desk 2.
In the present embodiment, the both sides of mobile laboratory are respectively provided with wiring window 16;Wiring window 16 includes external power supply Input, experiment power supply output end, current lifting device output end and the secondary line incoming end of transformer;External power supply input connects knife Lock cabinet 7, the output end of experiment power supply output end connection electronic power supply 10 and the output end of electrician's power supply 18, current lifting device output end connect Connect the first winding of current lifting device 4, the secondary line incoming end connection Intelligent transformator tester 6 of transformer and current loading case 20.Move Dynamic laboratory bottom laying damping and slide-prevention silicagel pad 17.In order to easy to use, mobile laboratory is using passageway and three-side door-opening Design.
As shown in figure 4, disconnecting link cabinet 7 connects power supply, electronic power supply 10 or electrician's power supply 18, mark are opened according to experiment demand selection Quasi- current transformer 5, current loading case 20 and the composition current transformer error of measurement of Intelligent transformator tester 6 system 21;Capacitive is mended Repay device 19, the summation current transformer error of measurement system 21 of current lifting device 4 to be sequentially connected in series, current lifting device 4 and standard current transformer 5 are by big Ampere wires are connected, and current lifting device 4 and the connection current lifting device output end of standard current transformer 5, current lifting device 4 are once mutual with normalized current Sensor 5 has once been fixedly connected, so without changing the primary connection of standard current transformer 5 again.Wherein, the He of electronic power supply 10 Each before and after electrician's power supply 18 to set one plug-in strip, electronic power supply 10 is used to connect electricity with the anterior plug-in strip set of electrician's power supply 18 Source;Electronic power supply 10 and the rear portion of electrician's power supply 18 set plug-in strip to be used to prevent voltage from pouring in down a chimney, because electronic power supply 10 and electrician's electricity The output end intercommunication in source 18, when electronic power supply 10 works, electrician's power supply 18 has the electricity poured in down a chimney into from the output end of electronic power supply 10 Pressure, easily causes the short circuit of electrician's power supply 18, when similarly electrician's power supply 18 works, electronic power supply 10 can also pour in down a chimney voltage, therefore set Put the connection of plug-in strip cut-out electronic power supply 10 and the output end of electrician's power supply 18.
In practical operation, when carrying out great current mutual inductor field-checking, the transport of mobile laboratory first will be loaded with Car, drives to subject current transformer, opens window, the current lifting device output end of the external power supply input of wiring window 16 Window, the window of the secondary line incoming end of transformer, high current wire, secondary line, ground wire, letter are taken out from Tool Cabinet 11 Number line etc., is first grounded to be tested current transformer with high current wire again and once hold and is connected with current lifting device output end, by standard electric The secondary winding of current transformer 5 and subject current transformer is connected according to error of measurement principle with the secondary line incoming end of transformer, Transformer station's power supply is connected with external power supply input.After checkout facility wiring is errorless, power transmission simultaneously opens monitoring system 23, opens The power switch of integrated form operating desk 2, jingle bell once, to show on-test, selects current testing, selection power supply and corresponding people Machine interacts giant-screen 3, starts automatic up-flow verification, and generate test report.
In actual applications, fire extinguisher can be set in mobile laboratory, be easy to handle fiery residence dangerous situation.Meanwhile, mobile experiment The side of room, which can be set, can arrange mobile folding table/chair in window, mobile laboratory, air-conditioning can be set in the top of mobile laboratory, Improve the comfortableness of mobile laboratory.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these modifications and change Type is within the scope of the claims in the present invention and its equivalent technologies, then these modifications and variations are also in protection scope of the present invention Within.
The prior art that the content not being described in detail in specification is known to the skilled person.

Claims (10)

1. great current mutual inductor site error verification mobile laboratory, it is characterised in that:Described mobile laboratory includes electricity Current transformer field-checking complexes, integrated form operating system, experimental enviroment monitoring system and safety monitoring system, the electricity Current transformer field-checking complexes and integrated form operating system are arranged in mobile laboratory.
2. great current mutual inductor site error verification mobile laboratory as claimed in claim 1, it is characterised in that:The electricity Current transformer field-checking complexes include current lifting device(4), standard current transformer(5), Intelligent transformator tester(6)、 Switch board(1), disconnecting link cabinet(7), electronic power supply(10)And multiple accessory cases;
The switch board(1)Inside layering sets electrician's power supply successively(18), capacitive compensation device(19)With current loading case(20);
The multiple accessory case includes power wire coil cabinet(8), high current wire case(9)And Tool Cabinet(11);
The standard current transformer(5), current loading case(20)With Intelligent transformator tester(6)Current transformer is constituted to survey Poor system(21);
The disconnecting link cabinet(7)Control electronic power supply(10)With electrician's power supply(18)Unlatching, the capacitive compensation device(19), rise Flow device(4)Summation current transformer error of measurement system(21)It is sequentially connected, the current lifting device(4)And standard current transformer(5)Pass through High current wire is connected.
3. great current mutual inductor site error verification mobile laboratory as claimed in claim 2, it is characterised in that:The collection Accepted way of doing sth operating system includes integrated form operating desk(2)Be embedded in integrated form operating desk(2)On man-machine interaction giant-screen(3).
4. great current mutual inductor site error verification mobile laboratory as claimed in claim 3, it is characterised in that:The examination Test the warm and humid supervising device that environmental monitoring system includes being separately positioned on inside and outside portion of mobile laboratory, the temperature of warm and humid supervising device Moisture signal is sent to man-machine interaction giant-screen(3).
5. great current mutual inductor site error verification mobile laboratory as claimed in claim 3, it is characterised in that:The peace Full monitoring system includes laboratory illuminator(22), monitoring system(23)And acoustooptic alarm system(24), the laboratory is shone Bright system(22), monitoring system(23)And acoustooptic alarm system(24)With disconnecting link cabinet(7)Connection.
6. great current mutual inductor site error verification mobile laboratory as claimed in claim 5, it is characterised in that:The reality Test room illuminator(22)Including the field lighting device being arranged at the top of mobile laboratory(15)Inside mobile laboratory Interior illuminator.
7. great current mutual inductor site error verification mobile laboratory as claimed in claim 5, it is characterised in that:The prison Control system(23)Including four outdoor type high-definition cameras being arranged at the top of mobile laboratory(13), the high-definition camera (13)Monitoring signal be sent to the real-time display platform of four split screens, the real-time display platform of four split screens hangs on integrated form operation Platform(2)Top.
8. great current mutual inductor site error verification mobile laboratory as claimed in claim 5, it is characterised in that:The sound Light alarm system(24)Including the warning lamp being arranged at the top of mobile laboratory(12)With the warning of mobile laboratory's exterior lateral sides Bell(14), the acoustooptic alarm system(24)Control line and integrated form operating desk(2)Connection.
9. the great current mutual inductor site error verification mobile laboratory as any one of claim 1-8, its feature It is:The both sides of the mobile laboratory are respectively provided with wiring window(16);
The wiring window(16)Including external power supply input, experiment power supply output end, current lifting device output end and transformer two Secondary line incoming end;
The external power supply input connects disconnecting link cabinet(7), experiment power supply output end connection electronic power supply(10)Output end and Electrician's power supply(18)Output end, current lifting device output end connection current lifting device(4)First winding, the secondary line incoming end of transformer connects Connect Intelligent transformator tester(6)With current loading case(20).
10. the great current mutual inductor site error verification mobile laboratory as any one of claim 1-8, its feature It is:Lay damping and slide-prevention silicagel pad in the mobile laboratory bottom(17).
CN201710399869.1A 2017-05-31 2017-05-31 Great current mutual inductor site error verification mobile laboratory Pending CN107271942A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710399869.1A CN107271942A (en) 2017-05-31 2017-05-31 Great current mutual inductor site error verification mobile laboratory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710399869.1A CN107271942A (en) 2017-05-31 2017-05-31 Great current mutual inductor site error verification mobile laboratory

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Publication Number Publication Date
CN107271942A true CN107271942A (en) 2017-10-20

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108414964A (en) * 2018-06-05 2018-08-17 国家电网有限公司 A kind of digitalized electric energy metering movable detecting platform and in-situ check and test method
CN108957049A (en) * 2018-08-29 2018-12-07 北斗航天汽车(北京)有限公司 Car electrics life test apparatus
CN111443323A (en) * 2020-04-26 2020-07-24 国网福建省电力有限公司 30000A current transformer field mobile calibration system

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CN202911610U (en) * 2012-09-21 2013-05-01 云南电网公司普洱供电局 Mutual inductor moving check trolley
CN203032515U (en) * 2013-01-08 2013-07-03 国网电力科学研究院武汉南瑞有限责任公司 On-site measurement verification vehicle for transformer
CN203178461U (en) * 2013-03-29 2013-09-04 国家电网公司 220kV high-voltage transformer mobile testing system
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CN105425193A (en) * 2016-01-12 2016-03-23 江苏省电力公司电力科学研究院 Extra-high-voltage current transformer verification system
CN205581286U (en) * 2016-05-09 2016-09-14 国网四川省电力公司电力科学研究院 Portable current transformer examination laboratory
CN206906569U (en) * 2017-05-31 2018-01-19 国网浙江省电力公司电力科学研究院 Great current mutual inductor site error verification mobile laboratory

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
CN202911610U (en) * 2012-09-21 2013-05-01 云南电网公司普洱供电局 Mutual inductor moving check trolley
CN203032515U (en) * 2013-01-08 2013-07-03 国网电力科学研究院武汉南瑞有限责任公司 On-site measurement verification vehicle for transformer
CN203178461U (en) * 2013-03-29 2013-09-04 国家电网公司 220kV high-voltage transformer mobile testing system
CN204462366U (en) * 2015-01-07 2015-07-08 中国南方电网有限责任公司超高压输电公司检修试验中心 A kind of electric power mutual-inductor measurement verification car intellectual monitoring control box
CN105425193A (en) * 2016-01-12 2016-03-23 江苏省电力公司电力科学研究院 Extra-high-voltage current transformer verification system
CN205581286U (en) * 2016-05-09 2016-09-14 国网四川省电力公司电力科学研究院 Portable current transformer examination laboratory
CN206906569U (en) * 2017-05-31 2018-01-19 国网浙江省电力公司电力科学研究院 Great current mutual inductor site error verification mobile laboratory

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108414964A (en) * 2018-06-05 2018-08-17 国家电网有限公司 A kind of digitalized electric energy metering movable detecting platform and in-situ check and test method
CN108957049A (en) * 2018-08-29 2018-12-07 北斗航天汽车(北京)有限公司 Car electrics life test apparatus
CN111443323A (en) * 2020-04-26 2020-07-24 国网福建省电力有限公司 30000A current transformer field mobile calibration system

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