CN107167755A - The control system and its control method of great current mutual inductor site error verification - Google Patents
The control system and its control method of great current mutual inductor site error verification Download PDFInfo
- Publication number
- CN107167755A CN107167755A CN201710399872.3A CN201710399872A CN107167755A CN 107167755 A CN107167755 A CN 107167755A CN 201710399872 A CN201710399872 A CN 201710399872A CN 107167755 A CN107167755 A CN 107167755A
- Authority
- CN
- China
- Prior art keywords
- integrated form
- current
- form operating
- power supply
- error
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses the control system and its control method of a kind of great current mutual inductor site error verification.The control system verified currently used for great current mutual inductor site error is mostly comparatively laborious, and security is not high, and operating efficiency is not also high.Current transformer field calibration system, experimental enviroment monitoring system in control system of the present invention are connected with integrated form operating system, and the integrated form operating system includes integrated form operating table surface and the man-machine interaction giant-screen being embedded in integrated form operating table surface；The control method of the present invention includes selection current testing, selects to open electronic power supply or electrician's power supply in integrated form operating table surface according to experiment demand；Integrated form operating system calculates verification loop primary parameter and required compensation capacity automatically, and controls switching capacitive compensation device to compensate；Integrated form operating system starts automatic up-flow verification, and generates test report.The system of the present invention has the advantages that operating efficiency height, safety and stability, verification accuracy rate are high.
Description
Technical field
The present invention relates to power equipment error checking field, specifically a kind of great current mutual inductor site error verification
Control system and its control method.
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 its accuracy directly influences electricity
Power market it is fair, 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, testing equipment volume is big, weight heavy,
Equipment is scattered, and it is big to transport and build pilot system workload, frequently entrucking, unload, lift and one easily is caused to testing equipment
Fixed damage；Moreover, test connection workload is big, complicated, operating efficiency is not high, requires high to testing crew；It is experiment automatized
Degree is relatively low.It can be seen that, the control system verified currently used for great current mutual inductor site error is mostly comparatively laborious, and security is not
Height, operating efficiency is not also high.
The content of the invention
The technical problems to be solved by the invention are that there is provided a kind of safety and stability for the defect that overcomes above-mentioned prior art to exist
Great current mutual inductor site error verification control system, with improve operating efficiency and verification accuracy rate.
Therefore, the present invention is adopted the following technical scheme that：The control system of great current mutual inductor site error verification, including
Current transformer field calibration system, integrated form operating system and experimental enviroment monitoring system, the current mutual inductor on site school
Check system, experimental enviroment monitoring system are connected with integrated form operating system, and the integrated form operating system includes integrated form
Operating table surface and the man-machine interaction giant-screen being embedded in integrated form operating table surface；
The current transformer field calibration system includes control power supply, capacitive compensation device, current lifting device summation current transformer and surveyed
Poor check system, the current transformer field calibration system is used for current mutual inductor on site error checking, control power supply connection
Capacitive compensation device, capacitive compensation device is in parallel with current lifting device, and current transformer error of measurement check system is used to be tested Current Mutual Inductance
The up-flow error checking of device；
The integrated form operating system is used for control electric current mutual inductor on site check system and monitoring test environmental monitoring system
Monitoring signals；
The experimental enviroment monitoring system is used for the humiture in monitoring test place.
On the basis of above-mentioned technical proposal, the control system also includes acoustooptic alarm system, the sound and light alarm system
System includes being arranged on the warning lamp at the top of mobile laboratory, control line and the integrated form operating system of the acoustooptic alarm system
Integrated form operating table surface is connected.
On the basis of above-mentioned technical proposal, the acoustooptic alarm system also includes being arranged on mobile laboratory's exterior lateral sides
Caution bell.
On the basis of above-mentioned technical proposal, the experimental enviroment monitoring system passes through warm and humid supervising device monitoring test
The humiture on ground, and the temperature-humidity signal of wet supervising device is sent to man-machine interaction giant-screen.
On the basis of above-mentioned technical proposal, the current transformer error of measurement check system include standard current transformer,
Current loading case, Intelligent transformator tester and error interference test cell, the output end of current lifting device by high current wire with
Standard current transformer is connected, and Intelligent transformator tester is connected with man-machine interaction giant-screen, error interference test cell and intelligence
Can mutual-inductor tester connection.
On the basis of above-mentioned technical proposal, the integrated form operation of the capacitive compensation device connection integrated form operating system
Table top, and control is compensated by the compensation control button of integrated form operating table surface, reach the optimal compensation effect of experiment demand
Really.
On the basis of above-mentioned technical proposal, the control power supply includes electronic power supply and electrician's power supply, according to experiment need
Seek the output end and capacitive that electronic power supply or electrician's power supply, electronic power supply and electrician's power supply are opened in the selection of integrated form operating table surface
Compensation device is connected.
On the basis of above-mentioned technical proposal, the electronic power supply and electrician's power supply pass through master in integrated form operating table surface
Knob and vernier knob regulation are adjusted, is easy to be accurately positioned electric current, electrician's power supply is in integrated form operating table surface by positive and negative
Phase adjusting knob switching electrician power supply finely tunes the regulation direction of pressure regulator, is easy to quick location current.
The present invention also provides the control method of above-mentioned great current mutual inductor site error checking control system, and it includes as follows
Step：
After the completion of A, current transformer field calibration system wiring, transformer station's power supply is connected, the collection of integrated form operating system is opened
The power switch of accepted way of doing sth operating table surface；
B, on the man-machine interaction giant-screen of integrated form operating system temperature-humidity signal is observed, required if experimental enviroment is met, it is accurate
Standby experiment；
C, selection current testing, select to open electronic power supply or electrician's power supply according to experiment demand in integrated form operating table surface；
D, integrated form operating system calculate verification loop primary parameter and required compensation capacity automatically, and control switching capacitive compensation
Device is compensated；
E, integrated form operating system start automatic up-flow verification, and generate test report.
On the basis of above-mentioned technical proposal, after step D, also comprise the following steps：Error interference test cell is adjusted
It is whole to arrive test mode, current lifting device is flowed up to 120% rated current by integrated form operating system, then by the electric current of current lifting device
0 is reduced to, the error signal on man-machine interaction giant-screen is observed in the process, if error is in subject current transformer error limit value
1/20 within, then by error interference test cell be adjusted to trystate continue test, be transferred to step E；If error exceedes quilt
The 1/20 of current transformer error limit value is tried, then termination test.
Compared with prior art, the device have the advantages that as follows：The present invention is used for great current mutual inductor scene by mistake
Difference verification, it is only necessary to which after the outdoor simple wiring of experiment, operating personnel can complete all verifying works by control system, improve
Operating efficiency；Meanwhile, error interference test cell of the invention can improve the standard of test data with measurement error interference volume
True property；Operating personnel isolate with high-potting part, have ensured the personal safety of operating personnel；Monitored provided with place and be with alarming
System, has ensured the safety of experiment；Whole movable detecting platform is safe and reliable without hydraulic machinery motion.
Brief description of the drawings
Fig. 1 is the structured flowchart of the control system of great current mutual inductor of embodiment of the present invention site error verification；
Fig. 2 is the control principle block diagram of integrated form operating system of the embodiment of the present invention；
Fig. 3 is the control method flow chart of great current mutual inductor site error checking control system of the embodiment of the present invention.
Embodiment
With reference to Figure of description and specific embodiment, the present invention is described in further detail.
Embodiment 1
Referring to shown in Fig. 1, Fig. 2, the embodiment of the present invention provides a kind of control system of great current mutual inductor site error verification, should
System includes current transformer field calibration system, integrated form operating system and experimental enviroment monitoring system, acoustooptic alarm system,
The current transformer field calibration system, experimental enviroment monitoring system are connected with integrated form operating system, described integrated
Formula operating system includes integrated form operating table surface and the man-machine interaction giant-screen being embedded in integrated form operating table surface；
The current transformer field calibration system includes control power supply, capacitive compensation device, current lifting device summation current transformer and surveyed
Poor check system, the current transformer field calibration system is used for current mutual inductor on site error checking, control power supply connection
Capacitive compensation device, capacitive compensation device is in parallel with current lifting device, and current transformer error of measurement check system is used to be tested Current Mutual Inductance
The up-flow error checking of device；The integrated form operating system is used for control electric current mutual inductor on site check system and monitoring test ring
The monitoring signals of border monitoring system；
The experimental enviroment monitoring system is used for the humiture in monitoring test place.
Wherein, the acoustooptic alarm system includes the warning lamp being arranged at the top of mobile laboratory and is arranged on mobile experiment
The caution bell of outdoor side, the control line of the acoustooptic alarm system and the integrated form operating table surface phase of integrated form operating system
Connection.The experimental enviroment monitoring system is by the humiture in warm and humid supervising device monitoring test place, and wet supervising device
Temperature-humidity signal is sent to man-machine interaction giant-screen.
Wherein, the current transformer error of measurement check system includes standard current transformer, current loading case, intelligent mutual inductance
Device tester and error interference test cell, the output end of current lifting device are connected by high current wire with standard current transformer,
Intelligent transformator tester is connected with man-machine interaction giant-screen.The capacitive compensation device connects the integrated of integrated form operating system
Formula operating table surface, and control is compensated by the compensation control button of integrated form operating table surface, reach the optimal of experiment demand
Compensation effect, error interference test cell is connected with the difference stream signal input part of Intelligent transformator tester.
In the present embodiment, the control power supply includes electronic power supply and electrician's power supply, according to experiment demand in integrated form
Electronic power supply or electrician's power supply, the output end and capacitive compensation device company of electronic power supply and electrician's power supply are opened in operating table surface selection
Connect.The electronic power supply and electrician's power supply are adjusted in integrated form operating table surface by homophony knob and vernier knob, are easy to essence
True location current, electrician's power supply switches the fine setting of electrician's power supply by just anti-phase adjusting knob in integrated form operating table surface and adjusted
The regulation direction of depressor, is easy to quick location current.
Embodiment 2
Shown in Figure 3, the present invention also provides the control of great current mutual inductor site error checking control system described in embodiment 1
Method, comprises the following steps：
After the completion of S1, current transformer field calibration system wiring, transformer station's power supply is connected, the collection of integrated form operating system is opened
The power switch of accepted way of doing sth operating table surface；Closure warning lamp switch, to show that power supply has been turned on；By caution bell, to show on-test；
S2, on the man-machine interaction giant-screen of integrated form operating system temperature-humidity signal is observed, required if experimental enviroment is met, it is accurate
Standby experiment；
S3, selection current testing, select to open electronic power supply or electrician's power supply according to experiment demand in integrated form operating table surface；
S4, integrated form operating system calculate verification loop primary parameter and required compensation capacity automatically, and control switching capacitive to mend
Device is repaid to compensate；
S5, error interference test cell is adjusted to test mode, flowed up current lifting device to 120% by integrated form operating system
After rated current, then the electric current of current lifting device is reduced to 0, the error signal on man-machine interaction giant-screen is observed in the process；If
Error interference test cell is adjusted to trystate within the 1/20 of subject current transformer error limit value, then and continued by error
Experiment, is transferred to step S6；If error exceedes the 1/20 of subject current transformer error limit value, termination test；
S6, integrated form operating system start automatic up-flow verification, and generate test report.
Wherein, error limit is determined according to the class of accuracy of subject current transformer.In actual applications, error interference
Test cell is settable two grades, that is, tests shelves and experiment shelves, when testing shelves state, and difference stream signal cannot be introduced into Intelligent transformator
Tester, during experiment shelves state, difference stream signal normally enters Intelligent transformator tester.
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. the control system of great current mutual inductor site error verification, it is characterised in that：Verified including current mutual inductor on site and be
System, integrated form operating system and experimental enviroment monitoring system, the current transformer field calibration system, experimental enviroment monitoring system
System is connected with integrated form operating system, and the integrated form operating system includes integrated form operating table surface and is embedded in integrated form behaviour
Make the man-machine interaction giant-screen on table top；
The current transformer field calibration system includes control power supply, capacitive compensation device, current lifting device summation current transformer and surveyed
Poor check system, the current transformer field calibration system is used for current mutual inductor on site error checking, control power supply connection
Capacitive compensation device, capacitive compensation device is in parallel with current lifting device, and current transformer error of measurement check system is used to be tested Current Mutual Inductance
The up-flow error checking of device；
The integrated form operating system is used for control electric current mutual inductor on site check system and monitoring test environmental monitoring system
Monitoring signals；
The experimental enviroment monitoring system is used for the humiture in monitoring test place.
2. the control system of great current mutual inductor site error verification as claimed in claim 1, it is characterised in that：The control
System also includes acoustooptic alarm system, and the acoustooptic alarm system includes being arranged on the warning lamp at the top of mobile laboratory, described
The control line of acoustooptic alarm system is connected with the integrated form operating table surface of integrated form operating system.
3. the control system of great current mutual inductor site error verification as claimed in claim 2, it is characterised in that：The acousto-optic
Warning system also includes the caution bell for being arranged on mobile laboratory's exterior lateral sides.
4. the control system of great current mutual inductor site error verification as claimed in claim 1, it is characterised in that：The experiment
Environmental monitoring system is by the humiture in warm and humid supervising device monitoring test place, and the temperature-humidity signal transmission of wet supervising device
To man-machine interaction giant-screen.
5. the control system of great current mutual inductor site error verification as claimed in claim 1, it is characterised in that：The electric current
Transformer error of measurement check system includes standard current transformer, current loading case, Intelligent transformator tester and error interference and surveyed
Unit is tried, the output end of current lifting device is connected by high current wire with standard current transformer, Intelligent transformator tester and people
Machine interaction giant-screen connection, error interference test cell is connected with Intelligent transformator tester.
6. the control system of great current mutual inductor site error verification as claimed in claim 5, it is characterised in that：The capacitive
Compensation device connects the integrated form operating table surface of integrated form operating system, and the compensation control button for passing through integrated form operating table surface
Compensate control.
7. the control system of great current mutual inductor site error verification as claimed in claim 1, it is characterised in that：The control
Power supply includes electronic power supply and electrician's power supply, and electronic power supply or electrician are opened in the selection of integrated form operating table surface according to experiment demand
The output end of power supply, electronic power supply and electrician's power supply is connected with capacitive compensation device.
8. the control system of great current mutual inductor site error verification as claimed in claim 7, it is characterised in that：The electronics
Power supply and electrician's power supply are adjusted in integrated form operating table surface by homophony knob and vernier knob, are easy to be accurately positioned electric current；
Electrician's power supply switches the regulation that electrician's power supply finely tunes pressure regulator in integrated form operating table surface by just anti-phase adjusting knob
Direction, is easy to quick location current.
9. a kind of controlling party based on any one of the claim 1-8 great current mutual inductor site error checking control systems
Method, it comprises the following steps：
After the completion of A, current transformer field calibration system wiring, transformer station's power supply is connected, the collection of integrated form operating system is opened
The power switch of accepted way of doing sth operating table surface；
B, on the man-machine interaction giant-screen of integrated form operating system temperature-humidity signal is observed, required if experimental enviroment is met, it is accurate
Standby experiment；
C, selection current testing, select to open electronic power supply or electrician's power supply according to experiment demand in integrated form operating table surface；
D, integrated form operating system calculate verification loop primary parameter and required compensation capacity automatically, and control switching capacitive compensation
Device is compensated；
E, integrated form operating system start automatic up-flow verification, and generate test report.
10. control method as claimed in claim 9, it is characterised in that：After step D, also comprise the following steps：Error is done
Disturb test cell and be adjusted to test mode, flowed up current lifting device to 120% rated current by integrated form operating system, then will
The electric current of current lifting device is reduced to 0, and the error signal on man-machine interaction giant-screen is observed in the process, if error is mutual in subject electric current
Within the 1/20 of sensor error limit, then error interference test cell is adjusted to trystate and continues to test, be transferred to step E；
If error exceedes the 1/20 of subject current transformer error limit value, termination test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710399872.3A CN107167755B (en) | 2017-05-31 | 2017-05-31 | Control system and control method for field error verification of large-current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710399872.3A CN107167755B (en) | 2017-05-31 | 2017-05-31 | Control system and control method for field error verification of large-current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107167755A true CN107167755A (en) | 2017-09-15 |
| CN107167755B CN107167755B (en) | 2023-07-14 |
Family
ID=59821094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710399872.3A Active CN107167755B (en) | 2017-05-31 | 2017-05-31 | Control system and control method for field error verification of large-current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107167755B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521389A (en) * | 2018-12-28 | 2019-03-26 | 武汉磐电科技股份有限公司 | A kind of electronic mutual inductor evaluating platform control system and its implementation |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2119676C1 (en) * | 1996-07-08 | 1998-09-27 | Иван Алексеевич Нефедьев | Device for verification of measuring current transformers |
| US6456061B1 (en) * | 2000-11-21 | 2002-09-24 | General Electric Company | Calibrated current sensor |
| RU2224266C1 (en) * | 2002-09-04 | 2004-02-20 | Рожнов Евгений Иванович | Meter of metrological characteristics of current transformer |
| CN102375135A (en) * | 2010-08-11 | 2012-03-14 | 苏州华电电气股份有限公司 | Field calibration system of current transformer for metering |
| US20120101760A1 (en) * | 2010-10-26 | 2012-04-26 | Praveen Sutrave | Method of Enabling Calibration of a Current Transformer, and Associated Apparatus |
| WO2014162021A1 (en) * | 2013-04-02 | 2014-10-09 | Arteche Centro De Tecnología, A.I.E. | Method for calibrating the measurement error of instrument transformers |
| 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 |
| CN104950277A (en) * | 2015-06-25 | 2015-09-30 | 国家电网公司 | Semi-automatic comprehensive detection device for low-voltage current transformer |
| 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 |
| CN105548941A (en) * | 2015-12-10 | 2016-05-04 | 国网四川省电力公司电力科学研究院 | Mutual inductor calibrator with function of calibration |
| CN106405469A (en) * | 2016-10-10 | 2017-02-15 | 中国电力科学研究院 | Variable-ratio magnetic potential comparison type transformer calibration system capable of self-calibration |
| CN206710585U (en) * | 2017-05-31 | 2017-12-05 | 国网浙江省电力公司电力科学研究院 | The control system of great current mutual inductor site error verification |
-
2017
- 2017-05-31 CN CN201710399872.3A patent/CN107167755B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2119676C1 (en) * | 1996-07-08 | 1998-09-27 | Иван Алексеевич Нефедьев | Device for verification of measuring current transformers |
| US6456061B1 (en) * | 2000-11-21 | 2002-09-24 | General Electric Company | Calibrated current sensor |
| RU2224266C1 (en) * | 2002-09-04 | 2004-02-20 | Рожнов Евгений Иванович | Meter of metrological characteristics of current transformer |
| CN102375135A (en) * | 2010-08-11 | 2012-03-14 | 苏州华电电气股份有限公司 | Field calibration system of current transformer for metering |
| US20120101760A1 (en) * | 2010-10-26 | 2012-04-26 | Praveen Sutrave | Method of Enabling Calibration of a Current Transformer, and Associated Apparatus |
| WO2014162021A1 (en) * | 2013-04-02 | 2014-10-09 | Arteche Centro De Tecnología, A.I.E. | Method for calibrating the measurement error of instrument transformers |
| 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 |
| CN104950277A (en) * | 2015-06-25 | 2015-09-30 | 国家电网公司 | Semi-automatic comprehensive detection device for low-voltage current transformer |
| CN105548941A (en) * | 2015-12-10 | 2016-05-04 | 国网四川省电力公司电力科学研究院 | Mutual inductor calibrator with function of calibration |
| 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 |
| CN106405469A (en) * | 2016-10-10 | 2017-02-15 | 中国电力科学研究院 | Variable-ratio magnetic potential comparison type transformer calibration system capable of self-calibration |
| CN206710585U (en) * | 2017-05-31 | 2017-12-05 | 国网浙江省电力公司电力科学研究院 | The control system of great current mutual inductor site error verification |
Non-Patent Citations (4)
| Title |
|---|
| LUCA CALLEGARO: "On the Calibration of Direct-Current Current Transformers (DCCT)", IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT,, vol. 64, no. 3, pages 723 - 727 * |
| 徐敏锐等: ""1000kV特高压GIS电流互感器现场误差智能化检定系统设计与应用"", vol. 52, no. 22, pages 68 - 72 * |
| 杨新业 等: "互感器误差校验设备的改造应用", 《内蒙古电力技术》, vol. 27, pages 79 - 80 * |
| 高敬更 等: "电子式互感器现场校验技术的研究", 《电子测量技术》, vol. 36, no. 7, pages 83 - 86 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521389A (en) * | 2018-12-28 | 2019-03-26 | 武汉磐电科技股份有限公司 | A kind of electronic mutual inductor evaluating platform control system and its implementation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107167755B (en) | 2023-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206710585U (en) | The control system of great current mutual inductor site error verification | |
| CN103454517B (en) | Capacitance type potential transformer on-line monitoring method | |
| CN102854486B (en) | On-site initiative error-verification system for voltage transformer and method thereof | |
| CN106950440B (en) | Substation's metering critical point is abnormal quickly to judge alarm method | |
| CN101894981A (en) | Intelligent monitoring, repair and control method of lead-acid battery pack and system thereof | |
| CN103616574B (en) | A kind of electric automobile anti-alone island detection system of energy storage combining inverter and detection method | |
| CN102087347A (en) | Charged test method for current transformer and application thereof | |
| CN202994931U (en) | Lightning arrester state monitoring device based on wireless sensing technology | |
| CN103344936A (en) | Method for fault simulation test of capacitor voltage transformer | |
| CN105425193A (en) | Extra-high-voltage current transformer verification system | |
| CN106154110A (en) | The method carrying out the roads light monitoring of fault location based on detection of electrical leakage | |
| CN202024755U (en) | High-voltage cable construction safety monitoring system based on magnetic field sensor | |
| CN103869197B (en) | Electric automobile charge and discharge device double-fed can test system | |
| CN202948123U (en) | On-site voltage transformer error active calibrating device | |
| CN104076218A (en) | Temperature rise test instrument and test method for large current charging connector | |
| CN107167755A (en) | The control system and its control method of great current mutual inductor site error verification | |
| CN205880191U (en) | A isolated plant for being directed at electric energy meter that possesses CT secondary circuit state monitor function carries out global function and detects | |
| CN103941160B (en) | Power distribution network loop closing detection device and method | |
| CN102890256B (en) | Failure current simulator and working method thereof | |
| CN205811661U (en) | A kind of monitoring system for power distribution networks | |
| CN107271942A (en) | Great current mutual inductor site error verification mobile laboratory | |
| CN105403808B (en) | A kind of localization method and device of DC line earth fault | |
| CN103941146B (en) | A kind of apparatus and method detecting and distinguish each Secondary Winding accuracy rating of 10kV current transformer that do not have a power failure | |
| CN110361578A (en) | The uniline of meter and soil layering is shorted shaft tower personal safety assessment system and method | |
| CN102879669B (en) | Failure current simulation device and working method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |