CN202305783U - Mutual inductor automation calibrating device - Google Patents
Mutual inductor automation calibrating device Download PDFInfo
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- CN202305783U CN202305783U CN2011202483041U CN201120248304U CN202305783U CN 202305783 U CN202305783 U CN 202305783U CN 2011202483041 U CN2011202483041 U CN 2011202483041U CN 201120248304 U CN201120248304 U CN 201120248304U CN 202305783 U CN202305783 U CN 202305783U
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- mutual inductor
- current transformer
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Abstract
The utility model discloses a mutual inductor automation calibrating device, and relates to a mutual inductor calibrating device. At present, a mutual inductor calibrating system adopts an artificial connection and automatic measurement mode, and because of various mutual inductor detection projects, a plurality of different devices is required to carry out the calibration. In calibration, the artificial connection and disconnection consume lots of times, and the efficiency is low. The mutual inductor automation calibrating device is characterized by including a frame body, a transmission line which is arranged in the middle of the frame body, a preventive test device which is used to carry out the insulation resistance, power frequency withstand voltage, and secondary turn-to-turn insulation tests, an error calibrating device which is used to carry out the error and magnetic saturation tests, and a control device which is used to control the motions of the preventive test device and the error calibrating device. The preventive test device and the error calibrating device are arranged on the frame body of the transmission line in order according to the advancing direction of the transmission line. The preventive test device and the error calibrating device can carry out the automatic connection to a mutual inductor, and can calibrate different projects to two mutual inductors at the same time, so the calibration time is shortened, and the calibration efficiency is improved.
Description
Technical field
The present invention relates to a kind of transformer calibrating device.
Background technology
The current transformer of using in the electrical network is the big equal current proportion in circuit to be reduced into secondary measure the required little electric current in loop, mainly realizes the electrical isolation at high-low pressure two ends and the function of equal proportion measurement.The metering Current Transformer is one of main measurement instrument that is used for the electric energy trade settlement, belongs to state compulsion calibrating standard.Each metering Current Transformer all need could normal use after qualified with periodic calibration through calibrating first.Along with rapid economy development, the recoverable amount of metering Current Transformer also sharply rises, and conventional artificial calibrating mode can not adapt to the ct calibrating demand of quick growth, and it is imperative to develop full automatic transformer calibrating device.
Present domestic each mutual inductor manufacturer, State Grid Corporation of China and the employed ct calibrating of national technical supervision department system all adopt artificial wiring, automatically metering system.Because the mutual inductor test item is numerous so need how the different equipment of cover is examined and determine, manual work connects to take out stitches and requires a great deal of time when carrying out these calibratings, has become the main bottleneck that improves ct calibrating efficient.
Summary of the invention
The technical matters that the present invention will solve and the technical assignment of proposition provide a kind of mutual inductor automatic calibration device, with the purpose that reaches automatic connection, automatic Verification, enhances productivity.For this reason, the present invention takes following technical scheme.
Mutual inductor automatic calibration device is characterized in that: comprise support body, be located at pipeline in the middle of the support body, arrange successively by the pipeline working direction and be located at the preventive trial device that is used for insulation resistance, industrial frequency withstand voltage and secondary turn to turn test on the other support body of pipeline and be used for error and the error calibrating installation of magnetic saturation test, be used for the control device of control and prevention property test unit and the action of error calibrating installation.Preventive trial device, error calibrating installation can and can carry out the calibrating of disparity items to two batches of mutual inductors simultaneously to the mutual inductor automatic connection, have shortened the calibrating time, have improved calibrating efficient.The mutual inductor automatic calibration is divided into two districts; At first mutual inductor is followed the preventive trial district that pipeline gets into the left side; Wait to test to finish and follow the error calibrating district that pipeline gets into the right, the preventive trial district establishes the preventive trial device, and error calibrating district establishes the error calibrating installation.
As the further of technique scheme improved and replenish, the present invention also comprises following additional technical feature.
Described preventive trial device and error calibrating installation include by the pipeline working direction and arrange the second calibrating unit and the first calibrating unit that is located on the other support body of pipeline successively.General preventive trial device and error calibrating installation transformer calibrating device are established 12 epi-positions, and process of the test need produce 1500A and above big electric current in 12 epi-positions, after adopting full-automatic calibrating; The ct calibrating beat is accelerated, and lead carries out cranking test with the device long-time continuous and lacks the heat radiation time, will cause temperature rise too high; Even can damage calibrating installation, so 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 inductor; Through big electric current,, have only six mutual inductors and a calibrating unit successively through big electric current at synchronization; Other six with another the calibrating unit be in holding state, this period capable of using dispels the heat.Temperature rise is stable in the verification process continuously, meets the demand of full-automatic, continuous cranking test.
The first calibrating unit in same preventive trial device, the error calibrating installation and the secondary circuit metering circuit of the second calibrating unit is separate and once big current return switch to be shared same big current source through a relay.Being connected through a relay between the once big current lead of the first calibrating unit, the second calibrating unit and the current source switched; Guarantee point at one time, all only exist a calibrating unit to be in energising calibrating state in preventive trial device and the error calibrating installation.
The described first calibrating unit, the second calibrating unit include bus type current transformer primary connection mechanism, multiple circle formula current transformer primary connection mechanism and secondary and connect thread depressing mechanism; Described bus type current transformer primary connection mechanism and multiple circle formula current transformer primary connection mechanism are the wiring mechanism that can move forward and backward, and both are divided into the pipeline both sides during standby.When detected object is a bus type current transformer; Then bus type current transformer primary connection mechanism moves in the middle of the transmission line body; And accomplish a winding punching and move; When detected object is multiple circle formula current transformer, then circle formula current transformer primary connection mechanism moves and near transmission line body and seized mutual inductor again, and accomplishes the winding crimping action one time; Bus type current transformer primary connection mechanism and multiple circle formula current transformer primary connection mechanism are divided into the forward and backward both sides of pipeline, avoid interference.Bus type current transformer primary connection mechanism, multiple circle formula current transformer primary connection mechanism are used for the primary side of mutual inductor is carried out wiring; Secondary connects thread depressing mechanism the secondary side of mutual inductor is carried out wiring; Realize the purpose of automatic connection, improve wiring efficient, accelerate detection efficiency.
The punching copper rod that is used to wear a plurality of bus type current transformers that described bus type 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 front and back driven unit right ends respectively before and after the bus type current transformer that moves before and after can be 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, gripped by the gas pawl.Can adopt sliding pair between driven unit and the support body before and after the bus type current transformer, before pipeline was sent bus type current transformer into station, driven unit moved to directly over the pipeline before and after the bus type current transformer; Approaching side mechanical arm and outgoing side mechanical arm are reduced to upper/lower positions; The gas pawl of approaching side mechanical arm lower end unclamps, and the approaching side mechanical arm rises, and the punching copper rod is by the gas pawl clamping of outgoing side mechanical arm; A plurality of mutual inductors are side by side followed the pipeline reach and are pierced into successively in the punching copper rod; The approaching side mechanical arm moves to upper/lower positions subsequently, and the gas pawl action clamping punching copper rod of approaching side mechanical arm lower end all is supported the left and right sides of punching copper rod.To be detected finishing, the gas pawl of outgoing side mechanical arm unclamps the punching copper rod, and then the outgoing side mechanical arm rises to the position, and mutual inductor is followed pipeline and is shifted out this station.
The gas pawl outside is provided with the column copperhead that is used to connect power lead, and two gas pawls of bus type current transformer primary connection mechanism and punching copper rod can form the closed-loop path and detect with the primary side series connection that realizes a plurality of bus type 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 before and after on the support body, be located at before and after the multiple circle formula current transformer on the driven unit a plurality of side by side be used for the crimp assemblies that the primary side with the multiple circle formula current transformer of correspondence is connected in series, crimp assemblies comprise can the multiple circle formula current transformer primary side terminal of clamping upper and lower conduction grip block.When the mutual inductor that detects is again circle formula mutual inductor, treat that mutual inductor moves to station, driven unit reach before and after the multiple circle formula current transformer, the crimping work of the primary side terminal realization primary side of upper and lower conduction grip block relative motion clamping mutual inductor.
Described secondary connects thread depressing mechanism and comprises that the secondary that can move up and down that is connected with support body connects line ball driven unit up and down, and described secondary connects line ball and is provided with the contact rod that a plurality of vertical being used for are connected with the mutual inductor secondary terminals in the driven unit lower end up and down.Contact rod is followed secondary and is connect up and down the moving down and be connected with the secondary terminal of mutual inductor of driven unit of line ball.
Beneficial effect: the present invention realizes automatically, fast-wiring, and simultaneously two batches of mutual inductors is carried out the calibrating of disparity items, has shortened the calibrating time, has improved calibrating efficient.
Description of drawings
Fig. 1 is master's TV structure synoptic diagram of the present invention.
Fig. 2 is a plan structure synoptic diagram of the present invention.
Fig. 3 is the present invention left side TV structure synoptic diagram.
Fig. 4 is a bus type current transformer primary connection mechanism structure synoptic diagram of the present invention.
Fig. 5 is the multiple circle formula current transformer primary connection mechanism structure synoptic diagram of the present invention.
Fig. 6 is that secondary of the present invention connects the thread depressing mechanism structural representation.
Among the figure: 1-support body, 2-pipeline, 3-preventive trial device, 4-error calibrating installation; 5-bus type current transformer primary connection mechanism, driven unit before and after the 501-bus type 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 mechanism of 6-; Driven unit before and after the multiple circle formula current transformer of 601-, the 602-crimp assemblies, the 603-grip block, the 7-secondary connects thread depressing mechanism; The 701-secondary connects line ball driven unit up and down, 702-contact rod, the 8-first calibrating unit, the 9-second calibrating unit.
Embodiment
Below in conjunction with Figure of description technical scheme of the present invention is done further detailed description.
Like Fig. 1,2, shown in 3; The present invention includes support body 1, be located at mobile pipeline 2 on the support body 1, arrange successively by pipeline 2 working direction and be located at the preventive trial device 3 that is used for insulation resistance, withstand voltage and secondary turn to turn test on the pipeline 2 other support bodys 1 and be used for error and the error calibrating installation 4 of magnetic saturation test, be used for the control device of control and prevention property test unit 3 and 4 actions of error calibrating installation, described preventive trial device 3 includes by pipeline 2 working direction with error calibrating installation 4 and arranges the second calibrating unit 9 and the first calibrating unit 8 that is located on the pipeline 2 other support bodys 1 successively.Being connected through a relay between the once big current lead of the first calibrating unit 8, the second calibrating unit 9 and the current source switched, and at most only exists a calibrating unit to be in the energising detected state to guarantee same time preventive trial device 3 and error calibrating installation 4.
The described first calibrating unit 8 or the second calibrating unit 9 include bus type 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 type current transformer primary connection mechanism 5 and multiple circle formula current transformer primary connection mechanism 6 are divided into pipeline 2 both sides.
As shown in Figure 4, described bus type current transformer primary connection mechanism 5 comprises 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 front and back driven unit right ends respectively before and after the bus type current transformer that moves before and after can be on support body 1, is located at the capable of opening and closing gas pawl 504 of approaching side mechanical arm 502 and the subordinate end of output tool, and the punching copper rod 505 that is used to wear a plurality of bus type current transformers that matches of two gas pawls 504.Wherein gas pawl 504 outsides are provided with the column copperhead 506 that is used to connect power lead, and two gas pawls 504 of bus type current transformer primary connection mechanism 5 and punching copper rod 505 can form the closed-loop path and realize that the primary side series connection of a plurality of bus type current transformers detects.
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 before and after on the support body 1, be located at before and after the multiple circle formula current transformer on the driven unit 601 a plurality of side by side be used for the crimp assemblies 602 that the primary side with the multiple circle formula current transformer of correspondence is connected in series, crimp assemblies 602 comprise can the multiple circle formula current transformer primary side terminal of clamping upper and lower conduction grip block 603.
As shown in Figure 6; Described secondary connects thread depressing mechanism 7 and comprises that the secondary that can move up and down that is connected with support body 1 connects line ball driven unit 701 up and down, and described secondary connects line ball and is provided with the contact rod 702 that a plurality of vertical being used for are connected with the mutual inductor secondary terminals in driven unit 701 lower ends up and down.
In the present technique scheme; Respectively bus type and multiple circle formula current transformer are designed with different primary connection mechanisms satisfying its different wiring requirement, and two kinds of different model mutual inductors connect thread depressing mechanism because of therefore its secondary terminals consistent size adopts a cover secondary terminal., secondary turn-to-turn insulation produces great amount of heat when examining and determine because will therefore in primary connection mechanism, understand through big electric current for a long time; And significantly rising of temperature rise can reduce the serviceable life of big current lead and mechanism, every group of 6 stations of two groups of mechanisms about therefore when this device of design, being divided into a collection of 12 mutual inductors.With conduction time of reducing each mechanism and make it that more time heat radiation arranged.
One, this device its operation steps when bus type current transformer being carried out the calibrating of preventive trial and error is following:
1) the calibrating management system software obtains task from the production scheduling platform, this task is decomposed the different epi-positions of different calibrating installations.The calibrating Control Software of mutual inductor automatic calibration device is obtained this task, carries out relevant preliminary work.
2) when calibrating installation confirms that this batch calibrating object is the bus-type mutual inductor; The bus type current transformer primary connection mechanism 5 of the first calibrating unit 8 of preventive trial device 3 is pushed into pipeline 2 centre positions, make punching copper rod 505 up and down the height with front and back position and pipeline 2 on the mutual inductor central hole location be consistent.
3) kept off the stopping time in the transmission line body sortation process when seized mutual inductor, confirmed the automatic calibration device that this batch mutual inductor should get into through the identification link.
When 4) the automatic calibration device obtains 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; The mutual inductor flow channel is abdicated in approaching side mechanical arm 502 risings subsequently, and punching copper rod 505 is in the monolateral outstanding state of holding at this moment.
5) after seized mutual inductor penetrates punching copper rod 505 to detection station from the left side of installing; Shelves stop mechanism by on the station is passed to the calibrating Control Software with the position feedback signal simultaneously; After receiving above-mentioned signal, the calibrating Control Software thinks that mutual inductor has arrived the detection station; Just control outgoing side mechanical arm 503 and descend, 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 connect line ball up and down driven unit 701 descend and make contact rod 702 crimping mutual inductor secondary terminals.
7) mutual inductor one Secondary Winding wiring finishes the back calibrating installation mutual inductor is carried out the open-circuit voltage that preparatory up-flow detects each mutual inductor secondary terminals, is used to verify whether mutual inductor one Secondary Winding wiring is reliable.
8) the calibrating instrument after wiring is accomplished on the preventive trial device 3 carries out insulation resistance to it respectively according to the requirement of vertification regulation. industrial frequency withstand voltage. and the secondary turn to turn test, and test findings uploaded to the calibrating Control Software.
9) when the first calibrating unit 8 of preventive trial device 3 detects; The calibrating Control Software is controlled 9 actions of the second calibrating unit; It is identical that its course of action and first group of bus type current transformer get into the first calibrating unit 8, accomplishes the preventive trial automatic connection of second group of seized mutual inductor and test automatically
10) after the first calibrating unit, 8 each items detect to be accomplished, the gas pawl 504 of the mechanical arm lower end of outgoing side unclamped punching copper rod 505, and the mechanical arm of outgoing side rises, and punching copper rod 505 was in once more and monolaterally outstandingly held state this moment, and mutual inductor flows out station to the right.
11) after mutual inductor on the station all flows out; Infrared inductor sum counter on the pipeline 2 will feed back the affirmation signal that mutual inductor all flows out copper rod; Outgoing side mechanical arm 503 descends; The gas of its lower end folder grips punching copper rod 505, and then driven unit 501 moves apart conveying belt with whole bus type current transformer primary connection mechanism 5 before and after the bus type current transformer, is positioned over home.
12) after the mutual inductor of the second calibrating unit 9 was accomplished and detected, its outflow process was identical with first group of mutual inductor.
13) first group of mutual inductor flows directly into the first calibrating unit 8 of error calibrating installation 4 after accomplishing preventive trial; Second group of mutual inductor accomplish that 9, the two groups of mutual inductors in the second calibrating unit that flow into error calibrating installation 4 behind the preventive trial flow into and the outflow process similar with at preventive trial device 3 time.
Two, this device its operation steps when multiple circle formula current transformer is carried out preventive trial and error calibrating is following:
This device is its calibrating mode and bus type basically identical when making multiple circle formula current transformer; Difference is: when multiple circle formula current transformer gets into; Multiple circle formula current transformer primary connection mechanism 6 actions of first or second calibrating unit, and bus type current transformer primary connection mechanism 5 is motionless, driven unit 601 moves to conveying belt before and after the multiple circle formula current transformer; Then, make a plurality of mutual inductor primary side series connection by side of crimp assemblies 602 clamping mutual inductors.After calibrating finished, crimp assemblies 602 was unclamped side of mutual inductor, and the front and back driven unit deviates from conveying belt, withdraws from test station.
Claims (8)
1. mutual inductor automatic calibration device is characterized in that: comprise support body (1); Be located at the middle pipeline (2) of support body (1); Arrange preventive trial device (3) that is used 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 the error calibrating installation (4) that is used for error and magnetic saturation is tested successively by pipeline (2) working direction; The control device that is used for the action of control and prevention property test unit (3) and error calibrating installation (4).
2. mutual inductor automatic calibration device according to claim 1 is characterized in that: described preventive trial device (3) and error calibrating installation (4) include by pipeline (2) working direction and arrange the second calibrating unit (9) and the first calibrating unit (8) that is located on the other support body of pipeline (2) (1) successively.
3. mutual inductor automatic calibration device according to claim 2 is characterized in that: the first calibrating unit (8) in same preventive trial device (3), the error calibrating installation (4) and the secondary circuit metering circuit of the second calibrating unit (9) is separate and once big current return switch to be shared same big current source through a relay.
4. according to claim 2 or 3 described mutual inductor automatic calibration devices; It is characterized in that: the described first calibrating unit (8) and the second calibrating unit (9) include bus type 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 type 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 both are divided into pipeline (2) both sides during standby.
5. mutual inductor automatic calibration device according to claim 4 is characterized in that: described bus type current transformer primary connection mechanism (5) comprises 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 front and back driven unit right ends respectively before and after the bus type current transformer that can before and after support body (1) is gone up, move, be located at approaching side mechanical arm (502) and the punching copper rod (505) that is used to wear a plurality of bus type current transformers of exporting capable of opening and closing gas pawl (504) that tool subordinate holds, being gripped by gas pawl (504).
6. mutual inductor automatic calibration device according to claim 5; It is characterized in that: gas pawl (504) outside is provided with the column copperhead (506) that is used to connect power lead, and two gas pawls (504) of bus type current transformer primary connection mechanism (5) and punching copper rod (505) can form the closed-loop path and realize that the primary side series connection of a plurality of bus type current transformers detects.
7. mutual inductor automatic calibration device according to claim 4; It is characterized in that: described multiple circle formula current transformer primary connection mechanism (6) comprises driven unit (601) before and after the multiple circle formula current transformer that can before and after support body (1) is gone up, move, be located at before and after the multiple circle formula current transformer on the driven units (601) a plurality of side by side be used for the crimp assemblies (602) that the primary side with the multiple circle formula current transformer of correspondence is connected in series, crimp assemblies (602) comprise can the multiple circle formula current transformer primary side terminal of clamping upper and lower conduction grip block (603).
8. mutual inductor automatic calibration device according to claim 4; It is characterized in that: described secondary connects thread depressing mechanism (7) and comprises that the secondary that can move up and down that is connected with support body (1) connects line ball driven unit (701) up and down, and described secondary connects line ball and is provided with the contact rod (702) that a plurality of vertical being used for are connected with the mutual inductor secondary terminals in driven unit (701) lower end up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202483041U CN202305783U (en) | 2011-07-14 | 2011-07-14 | Mutual inductor automation calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202483041U CN202305783U (en) | 2011-07-14 | 2011-07-14 | Mutual inductor automation calibrating device |
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| Publication Number | Publication Date |
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| CN202305783U true CN202305783U (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011202483041U Withdrawn - After Issue CN202305783U (en) | 2011-07-14 | 2011-07-14 | Mutual inductor automation calibrating device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353921A (en) * | 2011-07-14 | 2012-02-15 | 浙江省电力公司 | Automated calibrating device for mutual inductors |
| CN102353922A (en) * | 2011-07-22 | 2012-02-15 | 浙江省电力公司 | Automatic line connecting and pressing device for primary end of multi-turn type mutual inductor |
| CN103344935A (en) * | 2013-05-10 | 2013-10-09 | 国家电网公司 | Full-automatic low-voltage current transformer testing wiring apparatus |
| CN105425191A (en) * | 2015-12-16 | 2016-03-23 | 国网上海市电力公司 | High-voltage transformer detection method and system |
| US9562916B2 (en) | 2011-06-01 | 2017-02-07 | Zhejiang Electric Power Corporation | Full-automatic detecting system and method for transformer |
| CN109283479A (en) * | 2018-12-05 | 2019-01-29 | 河北申科电力股份有限公司 | Mutual inductor detection check equipment |
| CN109459716A (en) * | 2018-10-26 | 2019-03-12 | 浙江涵普电力科技有限公司 | Secondary circuit status checkout instrument calibrating installation |
-
2011
- 2011-07-14 CN CN2011202483041U patent/CN202305783U/en not_active Withdrawn - After Issue
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9562916B2 (en) | 2011-06-01 | 2017-02-07 | Zhejiang Electric Power Corporation | Full-automatic detecting system and method for transformer |
| CN102353921A (en) * | 2011-07-14 | 2012-02-15 | 浙江省电力公司 | Automated calibrating device for mutual inductors |
| CN102353922A (en) * | 2011-07-22 | 2012-02-15 | 浙江省电力公司 | Automatic line connecting and pressing device for primary end of multi-turn type mutual inductor |
| CN102353922B (en) * | 2011-07-22 | 2013-12-04 | 浙江省电力公司 | Automatic line connecting and pressing device for primary end of multi-turn type mutual inductor |
| CN103344935A (en) * | 2013-05-10 | 2013-10-09 | 国家电网公司 | Full-automatic low-voltage current transformer testing wiring apparatus |
| CN103344935B (en) * | 2013-05-10 | 2016-04-13 | 国家电网公司 | Full-automatic low-voltage current transformer test termination |
| CN105425191A (en) * | 2015-12-16 | 2016-03-23 | 国网上海市电力公司 | High-voltage transformer detection method and system |
| CN109459716A (en) * | 2018-10-26 | 2019-03-12 | 浙江涵普电力科技有限公司 | Secondary circuit status checkout instrument calibrating installation |
| CN109283479A (en) * | 2018-12-05 | 2019-01-29 | 河北申科电力股份有限公司 | Mutual inductor detection check equipment |
| CN109283479B (en) * | 2018-12-05 | 2020-11-17 | 河北申科电力股份有限公司 | Mutual inductor detection and calibration equipment |
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