CN102353921B - Automated calibrating device for mutual inductors - Google Patents
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- CN102353921B CN102353921B CN201110198630.0A CN201110198630A CN102353921B CN 102353921 B CN102353921 B CN 102353921B CN 201110198630 A CN201110198630 A CN 201110198630A CN 102353921 B CN102353921 B CN 102353921B
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- 238000012360 testing method Methods 0.000 claims abstract description 49
- 230000003449 preventive effect Effects 0.000 claims abstract description 30
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- 229910052802 copper Inorganic materials 0.000 claims description 21
- 239000010949 copper Substances 0.000 claims description 21
- 238000004080 punching Methods 0.000 claims description 21
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- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 241000271510 Agkistrodon contortrix Species 0.000 claims description 3
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Abstract
The invention discloses an automated calibrating device for mutual inductors, which relates to a calibrating device for mutual inductors. At present, a calibrating system for mutual inductors is implemented by adopting a manual line connection and automatic measurement mode, because the testing items for mutual inductors are numerous, multiple sets of different equipment are required to carry out calibration on the testing items, and when the calibrations are performed, line connection and disconnection operations need a large amount of time, and the efficiency is low. The automated calibrating device disclosed by the invention is characterized by comprising a rack body, a transmission line, a preventive test device, an error calibrating device and a control device, wherein the transmission line is arranged in the middle of the rack body; the preventive test device and the error calibrating device are sequentially arranged on the rack body beside the transmission line along the forward motion direction of the transmission line, the preventive test device is used for insulation resistance, power frequency withstand voltage and secondary turn-to-turn insulation tests, the error calibrating device is used for error and magnetic saturation tests, and the control device is used for controlling the preventive test device and the error calibrating device to act. The preventive test device and the error calibrating device can carry out automatic line connection on mutual inductors, and can simultaneously calibrate different items of two batches of mutual inductors, thereby shortening the calibration time and improving the calibration efficiency.
Description
Technical field
The present invention relates to a kind of transformer calibrating device.
Background technology
The current transformer of applying in electrical network is that the large equal current proportion in a circuit is reduced into the required little electric current in double measurement loop, mainly realizes the electrical isolation at high-low pressure two ends and the function that equal proportion is measured.Current transformer for metering is for one of main measurement instrument of electric energy trade settlement, belongs to state compulsion calibrating standard.Each current transformer for metering all needs could normal use after qualified by calibrating and periodic calibration first.Along with economic fast development, the recoverable amount of current transformer for metering also sharply rises, and traditional artificial calibrating mode can not adapt to the ct calibrating demand of rapid growth, develops full automatic transformer calibrating device imperative.
Current domestic each mutual inductor manufacturer, the ct calibrating system that State Grid Corporation of China and national technical supervision department are used all adopts artificial wiring, automatically metering system.Because mutual inductor test item is numerous so need to have the different equipment of many covers to examine and determine, when carrying out these calibratings, manually connect to take out stitches and require a great deal of time, become the Main Bottleneck that improves ct calibrating efficiency.
Summary of the invention
The technical assignment of the technical problem to be solved in the present invention and proposition is to provide a kind of Automated calibrating device for mutual inductors, with the object that reaches automatic connection, automatic Verification, enhances productivity.For this reason, the present invention takes following technical scheme.
Automated calibrating device for mutual inductors, is characterized in that: comprise support body, be located at pipeline in the middle of support body, by pipeline working direction, arrange successively the preventive trial device for insulation resistance, industrial frequency withstand voltage and secondary turn to turn test that is located on the other support body of pipeline and for the error testing device of error and magnetic saturation test, for the control device of control and prevention test unit and error testing device action.Preventive trial device, error testing device can and can carry out the calibrating of disparity items to two batches of mutual inductors to mutual inductor automatic connection simultaneously, have shortened the calibrating time, have improved calibrating efficiency.Mutual inductor automation calibrating is divided into Liang Ge district, first mutual inductor is followed the preventive trial district that pipeline enters the left side, the complete error testing district that pipeline enters the right that follows to be tested, preventive trial district establishes preventive trial device, and error testing district establishes error testing device.
As the further of technique scheme improved and supplemented, the present invention also comprises following additional technical feature.
Described preventive trial device and error testing device include by pipeline working direction and arrange successively the second calibrating unit and the first calibrating unit being located on the other support body of pipeline.General preventive trial device and error testing device transformer calibrating device are established 12 epi-positions, process of the test need to produce 1500A and above large electric current in 12 epi-positions, after adopting full-automatic calibrating, ct calibrating beat is accelerated, wire and device long-time continuous are carried out cranking test and are lacked the heat radiation time, to cause temperature rise too high, even can damage calibrating installation, therefore adopt the mode that a device is divided into two calibrating unit, 12 mutual inductors are divided into two groups, every group of each 6 mutual inductors, lead to successively super-high-current, at synchronization, only have six mutual inductors and a logical super-high-current in calibrating unit, examine and determine unit in holding state with another for other six, can utilize this period to dispel the heat.In verification process, temperature rise is stable continuously, meets the demand of full-automatic, continuous cranking test.
The secondary circuit metering circuit of first in same preventive trial device, error testing device calibrating unit and the second calibrating unit separate and once large current return by a relay switch, share same large current source.Being connected by a relay switch between once large current lead and the current source of the first calibrating unit, the second calibrating unit, guarantee point at one time, in preventive trial device and error testing device, all only exist a calibrating unit in energising calibrating state.
The first described calibrating unit, the second calibrating unit include bus style current transformer primary connection mechanism, multiple circle formula current transformer primary connection mechanism and secondary and connect thread depressing mechanism, described bus style current transformer primary connection mechanism and again circle formula current transformer primary connection mechanism are the wiring mechanism that can move forward and backward, and during standby, both are divided into pipeline both sides.When detected object is bus style current transformer, bus style current transformer primary connection mechanism moves in the middle of transmission line body, and complete the action of winding punching, when detected object is multiple circle formula current transformer, circle formula current transformer primary connection mechanism moves and close transmission line body and tested mutual inductor again, and completes winding crimping action; Bus style current transformer primary connection mechanism, avoids interference in the forward and backward both sides of pipeline with multiple circle formula current transformer primary connection branch construction.Bus style current transformer primary connection mechanism, multiple circle formula current transformer primary connection mechanism are for carrying out wiring to the primary side of mutual inductor, secondary connects thread depressing mechanism the secondary side of mutual inductor is carried out to wiring, realize the object of automatic connection, improve wiring efficiency, accelerate detection efficiency.
Described bus style current transformer primary connection mechanism comprises driven unit, the approaching side mechanical arm that can move up and down and the outgoing side mechanical arm that are connected with two ends, driven unit left and right, front and back respectively before and after the bus style current transformer that can move forward and backward on support body, be located at approaching side mechanical arm and the subordinate capable of opening and closing gas pawl of holding of output tool, by gas pawl, gripped for wearing the punching copper rod of a plurality of bus style current transformers.Before and after bus style current transformer, between driven unit and support body, can adopt sliding pair, at pipeline, bus style current transformer is sent into before station, before and after bus style current transformer, driven unit moves to directly over pipeline, approaching side mechanical arm and outgoing side mechanical arm are down to upper/lower positions, the gas pawl of approaching side mechanical arm lower end unclamps, approaching side mechanical arm rises, punching copper rod is clamped by the gas pawl of outgoing side mechanical arm, a plurality of mutual inductors are side by side followed pipeline reach and are pierced into successively in punching copper rod, approaching side mechanical arm moves to upper/lower positions subsequently, the gas pawl action clamping punching copper rod of approaching side mechanical arm lower end, the left and right sides of punching copper rod is all supported.To be detected complete, the gas pawl of outgoing side mechanical arm unclamps punching copper rod, and then outgoing side mechanical arm rises to position, and mutual inductor is followed pipeline and shifted out this station.
Gas pawl outside is provided with the column copperhead for connecting power line, and two gas pawls of bus style current transformer primary connection mechanism and punching copper rod can form closed-loop path to realize the primary side Series detectors of a plurality of bus style current transformers.
Described multiple circle formula current transformer primary connection mechanism comprises driven unit before and after the multiple circle formula current transformer that can move forward and backward on support body, be located at a plurality of crimp assemblies for the primary side of the multiple circle formula current transformer of correspondence is connected in series side by side on driven unit before and after multiple circle formula current transformer, and crimp assemblies comprises can clamp the upper and lower conductive holding piece of answering circle formula current transformer primary side terminal.When the mutual inductor detecting is during for multiple circle formula mutual inductor, treat that mutual inductor moves to station, driven unit reach before and after multiple circle formula current transformer, the primary side terminal of upper and lower conductive holding piece relative motion clamping mutual inductor is realized the crimping work of primary side.
Described secondary connects thread depressing mechanism and comprises that the secondary that can move up and down being connected with support body connects the upper and lower driven unit of line ball, and described secondary connects the upper and lower driven unit of line ball lower end and is provided with a plurality of vertical contact rods for being connected with mutual inductor secondary terminals.Contact rod is followed secondary and is connect moving down of the upper and lower driven unit of line ball and be connected with the secondary terminals of mutual inductor.
Beneficial effect: the present invention realizes automatically, fast-wiring, and two batches of mutual inductors are carried out to the calibrating of disparity items simultaneously, shortened the calibrating time, improved calibrating efficiency.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of the present invention.
Fig. 2 is plan structure schematic diagram of the present invention.
Fig. 3 is the left TV structure schematic diagram of the present invention.
Fig. 4 is bus style current transformer primary connection mechanism structure schematic diagram of the present invention.
Fig. 5 is the multiple circle formula current transformer primary connection mechanism structure schematic diagram of the present invention.
Fig. 6 is that secondary of the present invention connects thread depressing mechanism structural representation.
In figure: 1-support body, 2-pipeline, 3-preventive trial device, 4-error testing device, 5-bus style current transformer primary connection mechanism, driven unit before and after 501-bus style current transformer, 502-approaching side mechanical arm, 503-outgoing side mechanical arm, 504-gas pawl, 505-punching copper rod, 506-copperhead, the multiple circle formula current transformer primary connection of 6-mechanism, driven unit before and after the multiple circle formula current transformer of 601-, 602-crimp assemblies, 603-grip block, 7-connects thread depressing mechanism bis-times, 701-connects the upper and lower driven unit of line ball for bis-times, 702-contact rod, 8-the first calibrating unit, 9-the second calibrating unit.
Embodiment
Below in conjunction with Figure of description, technical scheme of the present invention is described in further detail.
As Fig. 1, 2, shown in 3, the present invention includes support body 1, be located at the mobile pipeline 2 on support body 1, by pipeline 2 working direction arrange be successively located on the other support bodys 1 of pipeline 2 for insulation resistance, the preventive trial device 3 of withstand voltage and secondary turn to turn test and for the error testing device 4 of error and magnetic saturation test, control device for control and prevention test unit 3 and 4 actions of error testing device, described preventive trial device 3 and error testing device 4 include by pipeline 2 working direction and arrange successively the second calibrating unit 9 and the first calibrating unit 8 being located on the other support body 1 of pipeline 2.Being connected by a relay switch between the once large current lead of the first calibrating unit 8, the second calibrating unit 9 and current source, to guarantee that same time preventive trial device 3 and error testing device 4 at most only exist a calibrating unit in energising detected state.
The first described calibrating unit 8 or the second calibrating unit 9 include bus style current transformer primary connection mechanism 5, multiple circle formula current transformer primary connection mechanism 6 and secondary and connect thread depressing mechanism 7, and described bus style current transformer primary connection mechanism 5 and again circle formula current transformer primary connection mechanism 6 are divided into pipeline 2 both sides.
As shown in Figure 4, described bus style current transformer primary connection mechanism 5 comprise driven unit 501, the approaching side mechanical arm 502 that can move up and down and the outgoing side mechanical arm 503 that are connected with two ends, driven unit left and right, front and back respectively before and after the bus style current transformer that can move forward and backward on support body 1, be located at approaching side mechanical arm 502 and the subordinate end of output tool capable of opening and closing gas pawl 504, and two gas pawls 504 match for wearing the punching copper rod 505 of a plurality of bus style current transformers.Wherein gas pawl 504 outsides are provided with the column copperhead 506 for connecting power line, and two gas pawls 504 and the punching copper rod 505 of bus style current transformer primary connection mechanism 5 can form the primary side Series detectors that a plurality of bus style current transformers are realized in closed-loop path.
As shown in Figure 5, multiple circle formula current transformer primary connection mechanism 6 comprises driven unit 601 before and after the multiple circle formula current transformer that can move forward and backward on support body 1, be located at a plurality of crimp assemblies 602 for the primary side of the multiple circle formula current transformer of correspondence is connected in series side by side on driven unit 601 before and after multiple circle formula current transformer, and crimp assemblies 602 comprises can clamp the upper and lower conductive holding piece 603 of circle formula current transformer primary side terminal again.
As shown in Figure 6, described secondary connects thread depressing mechanism 7 and comprises that the secondary that can move up and down being connected with support body 1 connects the upper and lower driven unit 701 of line ball, and described secondary connects the upper and lower driven unit of line ball 701 lower ends and is provided with a plurality of vertical contact rods 702 for being connected with mutual inductor secondary terminals.
In the technical program, respectively bus type and multiple circle formula current transformer are designed with to different primary connection mechanisms to meet its different wiring requirement, and therefore two kinds of different model mutual inductors adopt a set of secondary terminals to connect thread depressing mechanism because of its secondary terminals consistent size.When examining and determine, secondary turn-to-turn insulation therefore in primary connection mechanism, can produce a large amount of heats because will lead to for a long time super-high-current, and significantly rising of temperature rise can reduce the serviceable life of large current lead and mechanism, therefore when this device of design, a collection of 12 mutual inductors are divided into every group of 6 stations of left and right Liang Zu mechanism.To reduce the conduction time of each mechanism and to make it have more time heat radiation.
one, this device its operation steps when bus style current transformer is carried out to preventive trial and error testing is as follows:
1) inspection administration system software obtains task from production scheduling platform, the different epi-positions by this Task-decomposing to different calibrating installations.The calibrating of Automated calibrating device for mutual inductors is controlled software and is obtained this task, carries out relevant preliminary work.
2) when calibrating installation confirms that this batch of calibrating object is bus type mutual inductor, preventive trial device 3 first calibrating unit 8 bus style current transformer primary connection mechanism 5 be pushed into pipeline 2 centre positions, make punching copper rod 505 up and down height with front and back position and pipeline 2 on mutual inductor central hole location be consistent.
3) when tested mutual inductor is kept off the stopping time in transmission line body sortation process, by identification link, determine the automation calibrating device that this batch of mutual inductor should enter.
4) when automation calibrating device obtains the trigger pip that conveying management software sends, the gas pawl 504 of approaching side mechanical arm 502 lower ends of preventive trial unit unclamps punching copper rod 505, mutual inductor flow channel is abdicated in approaching side mechanical arm 502 risings subsequently, and now punching copper rod 505 is in the monolateral outstanding state of holding.
5) tested mutual inductor penetrates punching copper rod 505 to detecting station from the left side of device; by the shelves stop mechanism on station, position feedback signal is passed to calibrating simultaneously and controlled software; calibrating is controlled after software is received above-mentioned signal and is thought that mutual inductor has arrived detection station; just control outgoing side mechanical arm 503 and decline, the gas pawl 504 punching copper rod 505 of holding with a firm grip.
6) secondary that the secondary that is suspended on 8 tops, the first calibrating unit connects thread depressing mechanism 7 connects the upper and lower driven unit 701 of line ball and declines and make contact rod 702 crimping mutual inductor secondary terminals.
7) whether mutual inductor one Secondary Winding wiring finishes rear calibrating installation mutual inductor is carried out to the open-circuit voltage that pre-up-flow detects each mutual inductor secondary terminals, reliable for verifying mutual inductor one Secondary Winding wiring.
8) wiring complete after calibrating instrument on preventive trial device 3 according to the requirement of vertification regulation, respectively it is carried out to insulation resistance. industrial frequency withstand voltage. secondary turn to turn test, and test findings is uploaded to calibrating control software.
9) when the first calibrating unit 8 of preventive trial device 3 detects, software control the second calibrating unit 9 actions are controlled in calibrating, it is identical that its course of action and first group of bus style current transformer enter the first calibrating unit 8, completes the preventive trial automatic connection of second group of tested mutual inductor and test automatically
10) after the first calibrating every detection in unit 8 completes, the gas pawl 504 of the mechanical arm lower end of outgoing side unclamps punching copper rod 505, and the mechanical arm of outgoing side rises, and now punching copper rod 505 is held state in monolateral hanging again, and mutual inductor flows out station to the right.
11) after on station, mutual inductor all flows out, infrared inductor sum counter on pipeline 2 all flows out feedback mutual inductor the confirmation signal of copper rod, outgoing side mechanical arm 503 declines, the gas folder of its lower end grips punching copper rod 505, then before and after bus style current transformer, driven unit 501 moves apart conveying belt by whole bus style current transformer primary connection mechanism 5, is positioned over home.
12) mutual inductor of the second calibrating unit 9 completes after detection, and its outflow process is identical with first group of mutual inductor.
13) first group of mutual inductor flows directly into first of error testing device 4 and examines and determine unit 8 after completing preventive trial, the second 9, two groups of unit of calibrating mutual inductor that second group of mutual inductor flows into error testing device 4 after completing preventive trial flow into and outflow process similar to when the preventive trial device 3.
Two, this device its operation steps when multiple circle formula current transformer is carried out to preventive trial and error testing is as follows:
This device when making multiple circle formula current transformer its calibrating mode and bus type basically identical, difference is: when multiple circle formula current transformer enters, multiple circle formula current transformer primary connection mechanism 6 actions of first or second calibrating unit, and bus style current transformer primary connection mechanism 5 is motionless, before and after multiple circle formula current transformer, driven unit 601 moves to conveying belt, then by side of crimp assemblies 602 clamping mutual inductors, make a plurality of mutual inductor primary side series connection.After calibrating finishes, crimp assemblies 602 is unclamped side of mutual inductor, and front and back driven unit deviates from conveying belt, exits test station.
Claims (6)
1. Automated calibrating device for mutual inductors, is characterized in that: comprise support body (1); Be located at the middle pipeline (2) of support body (1); By pipeline (2) working direction, arrange successively the preventive trial device (3) for insulation resistance, industrial frequency withstand voltage and secondary turn to turn test that is located on the other support body of pipeline (2) (1) and for the error testing device (4) of error and magnetic saturation test; Control device for control and prevention test unit (3) and error testing device (4) action; Described preventive trial device (3) and error testing device (4) include by pipeline (2) working direction and arrange successively the second calibrating unit (9) and the first calibrating unit (8) being located on the other support body of pipeline (2) (1); The first described calibrating unit (8) and the second calibrating unit (9) include bus style current transformer primary connection mechanism (5), multiple circle formula current transformer primary connection mechanism (6) and secondary and connect thread depressing mechanism (7), described bus style current transformer primary connection mechanism (5) and multiple circle formula current transformer primary connection mechanism (6) are the wiring mechanism that can move forward and backward, and during standby, both are divided into pipeline (2) both sides.
2. Automated calibrating device for mutual inductors according to claim 1, is characterized in that: the secondary circuit metering circuit of the calibrating unit (8) of first in same preventive trial device (3) or same error testing device (4) and the second calibrating unit (9) separate and once large current return by the shared same large current source of a relay switch.
3. Automated calibrating device for mutual inductors according to claim 1, it is characterized in that: described bus style current transformer primary connection mechanism (5) comprises the bus style current transformer front and back driven unit (501) that can move forward and backward on support body (1), the approaching side mechanical arm (502) that can move up and down and the outgoing side mechanical arm (503) that are connected with two ends, driven unit left and right, front and back respectively, be located at the capable of opening and closing gas pawl (504) of approaching side mechanical arm (502) and the subordinate end of output tool, by gas pawl (504), gripped for wearing the punching copper rod (505) of a plurality of bus style current transformers.
4. Automated calibrating device for mutual inductors according to claim 1, it is characterized in that: gas pawl (504) outside is provided with the column copperhead (506) for connecting power line, and two gas pawls (504) and the punching copper rod (505) of bus style current transformer primary connection mechanism (5) can form the primary side Series detectors that a plurality of bus style current transformers are realized in closed-loop path.
5. Automated calibrating device for mutual inductors according to claim 1, it is characterized in that: described multiple circle formula current transformer primary connection mechanism (6) comprises the multiple circle formula current transformer front and back driven unit (601) that can move forward and backward on support body (1), be located at a plurality of crimp assemblies (602) for the primary side of the multiple circle formula current transformer of correspondence is connected in series side by side on multiple circle formula current transformer front and back driven units (601), crimp assemblies (602) comprises can clamp the upper of multiple circle formula current transformer primary side terminal, lower conductive holding piece (603).
6. Automated calibrating device for mutual inductors according to claim 1, it is characterized in that: described secondary connects thread depressing mechanism (7) and comprises that the secondary that can move up and down being connected with support body (1) connects the upper and lower driven unit of line ball (701), described secondary connects the upper and lower driven unit of line ball (701) lower end and is provided with a plurality of vertical contact rods (702) for being connected with mutual inductor secondary terminals.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110198630.0A CN102353921B (en) | 2011-07-14 | 2011-07-14 | Automated calibrating device for mutual inductors |
| PCT/CN2011/082916 WO2012163064A1 (en) | 2011-06-01 | 2011-11-25 | Full-automatic detecting system and method for transformer |
| US13/980,556 US9562916B2 (en) | 2011-06-01 | 2011-11-25 | Full-automatic detecting system and method for transformer |
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| CN201110198630.0A CN102353921B (en) | 2011-07-14 | 2011-07-14 | Automated calibrating device for mutual inductors |
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| CN102353921A CN102353921A (en) | 2012-02-15 |
| CN102353921B true CN102353921B (en) | 2014-03-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103135088A (en) * | 2013-01-31 | 2013-06-05 | 云南电力试验研究院（集团）有限公司电力研究院 | Comprehensive detection method of electric transformer at and below 35 kilovolts |
| CN103344895B (en) * | 2013-07-30 | 2015-07-01 | 河北海纳电测仪器股份有限公司 | Automatic verification system of low-voltage current transformer |
| CN103616656B (en) * | 2013-11-08 | 2017-02-01 | 国家电网公司 | Automation detection line mutual inductor rod penetrating mechanism for low-voltage current mutual inductors |
| CN103616605B (en) * | 2013-11-08 | 2016-08-17 | 国家电网公司 | A kind of low-voltage current mutual inductor streamline detection method of optimization |
| CN103995155B (en) * | 2014-05-20 | 2016-08-31 | 厦门红相电力设备股份有限公司 | Voltage transformer detects streamline primary connection mechanism automatically |
| CN104020434B (en) * | 2014-06-16 | 2017-02-15 | 国网上海市电力公司 | Automatic calibrating system for metering low-voltage current transformer |
| CN106154204B (en) * | 2016-08-18 | 2023-03-31 | 大连第一互感器有限责任公司 | Follow-up pressure contact device of super-large current primary current-carrying conductor |
| CN106842096B (en) * | 2017-01-22 | 2021-03-23 | 国网山东省电力公司潍坊供电公司 | Auxiliary wiring device for batch verification of high-voltage current transformers |
| CN107643504A (en) * | 2017-09-08 | 2018-01-30 | 国网重庆市电力公司电力科学研究院 | A kind of mutual inductor on site examines wiring and automatic switching method |
| CN108802659A (en) * | 2018-08-22 | 2018-11-13 | 湖北仪天成电力设备有限公司 | A kind of frequency conversion type mutual inductor comprehensive tester |
| CN109932674A (en) * | 2019-03-18 | 2019-06-25 | 广州供电局有限公司 | Mutual inductor detects fixture and mutual inductor detection system |
| CN110261807A (en) * | 2019-06-06 | 2019-09-20 | 广州供电局有限公司 | Mutual inductor detection system, mutual inductor detection method and device |
| CN110275126A (en) * | 2019-07-09 | 2019-09-24 | 河北海纳电测仪器股份有限公司 | Quality of transformer performance test experimental bed |
| CN111562532A (en) * | 2020-07-16 | 2020-08-21 | 宁波中车时代传感技术有限公司 | Online batch parallel testing device for current sensors |
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| CN101403789B (en) * | 2008-11-05 | 2011-05-11 | 四川电力试验研究院 | Standard verification apparatus of high-voltage three-phase combined transformer |
| CN101424728B (en) * | 2008-11-10 | 2011-09-14 | 西北电网有限公司 | On site precision detecting test line for high-voltage current transformer |
| CN201689168U (en) * | 2010-03-04 | 2010-12-29 | 国网电力科学研究院 | Calibration test device of an electronic transformer calibration instrument |
| CN101893694B (en) * | 2010-06-24 | 2014-06-18 | 国网电力科学研究院武汉南瑞有限责任公司 | Error testing device of voltage transformator |
| CN202305783U (en) * | 2011-07-14 | 2012-07-04 | 浙江省电力公司 | Mutual inductor automation calibrating device |
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