CN105842510A - Electronic transformer with self-calibration function and self-calibration method thereof - Google Patents
Electronic transformer with self-calibration function and self-calibration method thereof Download PDFInfo
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- CN105842510A CN105842510A CN201610152892.6A CN201610152892A CN105842510A CN 105842510 A CN105842510 A CN 105842510A CN 201610152892 A CN201610152892 A CN 201610152892A CN 105842510 A CN105842510 A CN 105842510A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- 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
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Abstract
The invention provides an electronic transformer with a self-calibration function. The electronic transformer comprises a sensing head, a signal processing unit, a merging unit, a standard direct current power supply, a multipath switch, a control unit and a calibration module. A standard direct current voltage source is used for outputting a standard signal with a known amplitude and a phase under a calibration mode. The multipath switch is used for switching between the sensing head and the standard direct current voltage source. The control unit is used for making the multipath switch be switched to a standard direct current voltage source side. The calibration module is used for comparing a standard-source detected value calculated and acquired by the merging unit to a standard-source theoretical value so as to acquire a ratio difference and an angle difference of the electronic transformer. The self-calibration function of the electronic transformer is realized and/or whether an acquisition circuit in the signal processing unit works normally is determined.
Description
Technical field
The present invention relates to electric measurement field, particularly to electronic mutual inductor and the self-correcting thereof of a kind of band self-calibration function
Quasi-method.
Background technology
Under State Grid Corporation of China carries forward vigorously the overall background that intelligent grid is built, electronic mutual inductor is different from traditional
Electromagnetic transformer, a large amount of integrated electronic circuits, use optical fiber transmission signal, and it is low to have insulation costs, volume
Little feature, obtains certain development with its digitized, intelligentized huge advantage, has adapted to intelligent grid trend,
At present under Guo Wang company supports energetically in a large number linked network pilot run and be in practical developmental stage, it is desirable to replacement
Conventional electromagnetic transformer.But, from the point of view of the applicable cases with regard to current electronic mutual inductor, electronic mutual inductor is frequent
Breaking down and overproof, its stability and reliability still have much room for improvement.It is thus desirable to the operation to electronic mutual inductor
State carries out on-line monitoring.The calibrating of electronic mutual inductor at present is the same with tradition transformer, carries out after being required for having a power failure,
And needing periodic calibration, this periodic pattern having a power failure calibrating is gradually not suitable with current electric grid developing direction, right
Maintenance work brings inconvenience, operation of power networks also causes certain risk simultaneously.
At present, calibrating for error typically all by having compared with standard mutual inductor of transformer, it is typically necessary
Power failure is carried out, and uses up-flow increasing apparatus to coordinate with standard mutual inductor and carries out.But after actual substation operation, peace
Row's interruption maintenance planned time is tighter, it is impossible to examines and determine according to the cycle, brings necessarily to operation of power networks and metering and billing
Risk.
It addition, electronic mutual inductor error characteristics contrast and calibration steps online, it is the most all to use a set of or two set electricity
Magnetic-type transformer, as reference standard, needs extra standard device on-line operation simultaneously.
Summary of the invention
In view of the above problems, it is proposed that the present invention, in order on offer one overcomes the problems referred to above or solves at least in part
State electronic current mutual inductor and the method for self-calibrating thereof of a kind of band self-calibration function of problem.
According to an aspect of the present invention, it is provided that the electronic mutual inductor of a kind of band self-calibration function, including sensing head,
Signal processing unit and combining unit, it is characterised in that also include standard DC power supply, variable connector, control unit
And calibration module:
Described sensing head is for output services signal under described electronic mutual inductor normal mode of operation；
Described standard direct voltage source is as standard source, known for exporting under described electronic mutual inductor calibration mode
Amplitude and the standard signal of phase place；
Described signal processing unit processes for the signal exporting described sensing head or described standard direct voltage source
And conversion, and issue described combining unit and carry out calculating or comparison；
Described variable connector is for the control signal sent according to described control unit, in described sensing head and described standard
Switch between direct voltage source；
Described control unit is for according to described combining unit or the control instruction remotely sent, controlling described variable connector
Switch to described standard direct voltage source side；
Described combining unit for receive signal calculate or comparison, and with follow-up measurement apparatus or control
Device communicates；
Described calibration module is under described electronic mutual inductor calibration mode, by calculated for described combining unit
Standard source measured value contrasts with standard source theoretical value, obtains ratio and the angular difference value of described electronic mutual inductor, real
The self-calibration function showing electronic mutual inductor and/or the Acquisition Circuit judging in described signal processing unit are the most just working
Often.
Further, also to include that guidance panel, described guidance panel are used for arranging selected described for described electronic mutual inductor
The mode of operation of electronic mutual inductor and display calibration result.
Further, described calibration module and described guidance panel are integrated in described combining unit.
Further, described sensing head, standard direct voltage source, signal processing unit, variable connector and control unit
It is positioned at the high-pressure side of described electronic mutual inductor；Described combining unit, calibration module and guidance panel are positioned at described electronics
The low-pressure side of formula transformer.
Further, described signal processing unit include data acquisition, A/D conversion, Filtering Processing, opto-electronic conversion and
Data send, and described opto-electronic conversion processes for the optical signal of entering signal processing unit is changed into the signal of telecommunication,
And the signal of telecommunication after processing is converted into optical signal and is sent to described combining unit.
Further, described variable connector is grammed switch.
Further, when described electronic mutual inductor operates in normal mode of operation, described variable connector and described biography
Sense rostral connection, is gathered signal by described sensing head, transmits to described through described variable connector and signal processing unit
Combining unit, then carried out data calculating by described combining unit, described standard direct voltage source is in holding state, no
Export any signal；
When described electronic mutual inductor operates in calibration mode, described variable connector disconnects the signal with described sensing head
And switching to described standard direct voltage source side, described standard direct voltage source is controlled by described control unit, and output is
Know that the signal of amplitude and phase place, as standard signal source, also serves as electronic mutual inductor measured signal source, through described letter
Number processing unit 13, combining unit 21 carry out process and are calculated measured value, by described calibration module by measured value
Contrast with the standard value of standard signal, obtain ratio and the angular difference value of electronic mutual inductor, and at described operating surface
Show the calibration result such as ratio and angular difference on plate, decide whether as required to repay ratio and angular difference value complement to described merging
Unit, it is achieved the self-calibration function of electronic mutual inductor.
Further, described standard direct voltage source uses shielding measure and constant temperature measures ensure accuracy requirement and stablize
Property requirement.
Further, described shielding measure is double-layer shielding structure, wraps up thicker iron-clad in high-pressure side and accordingly
Iron sheet is wrapped up on circuit board；Described constant temperature measures uses temperature sensor, monitors residing for described standard direct voltage source
Ambient temperature, and by constant for ambient temperature at 40 DEG C-50 DEG C.
According to a further aspect in the invention, it is provided that the method for self-calibrating of a kind of electronic mutual inductor, described method include as
Lower step:
Combining unit obtains the mode of operation of the electronic mutual inductor that user selectes, and according to mode of operation to control unit
Send control instruction, control the variable connector signal switching at sensing head end or standard direct voltage source end, in normal work
Under operation mode, variable connector leads to sensing head side joint；In the calibration mode, variable connector and standard direct voltage source side
Connect；
The sensing head working signal of access or the standard signal of standard direct voltage source are processed by signal processing unit
After conversion, input to combining unit；
Described combining unit carries out different process according to selected mode of operation, calculates and export.
The present invention need not extra electromagnetic transformer just can realize electronic mutual inductor constantly as standard device
Carry out on-line calibration function in the case of electricity, effectively promote operational efficiency and the O&M level of electrical network.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, required use in embodiment being described below
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention,
For those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to attached according to these
Figure obtains other accompanying drawing.
Fig. 1 is the electronic mutual inductor principle schematic of the band self-calibration function of an embodiment of the present invention.
Detailed description of the invention
Describe in more detail the exemplary embodiment of the present invention below with reference to accompanying drawings.Although accompanying drawing shows the present invention
Exemplary embodiment, it being understood, however, that may be realized in various forms the present invention, and should not illustrated here
Embodiment is limited.On the contrary, it is provided that these embodiments are to enable the more thorough explanation present invention, and can by this
Invention scope complete convey to those skilled in the art.
Ordinary electronic formula transformer is mainly made up of the device above dotted line in accompanying drawing 1, including sensing head 11, signal
Processing unit 13 and combining unit 21 form, and the electronic mutual inductor of the band self-calibration function of the embodiment of the present invention is with general
Logical electronic mutual inductor is compared, and electronic type transformer high voltage side 10 also includes standard DC power supply 12, variable connector 14
With control unit 15, combining unit 21 also includes transducer check module 212, and then is capable of electronic mutual inductor
Self-calibration function, establish the electronic mutual inductor of a cuff self-calibration function, greatly promote electronic mutual inductor
Application development.
According to an aspect of the present invention, as shown in Figure 1, it is provided that the electronic mutual inductor of a kind of band self-calibration function,
Including electronic type transformer high voltage side 10 and electronic mutual inductor low-pressure side 20, wherein, electronic type transformer high voltage side
10 include the sensing head 11 of transformer, standard direct voltage source 12, signal processing unit 13, variable connector 14 and control
Unit 15 processed, sensing head 11 is for output services signal under electronic mutual inductor normal mode of operation；Standard direct current
Voltage source 12, as the calibration source (standard source) of electronic mutual inductor self-calibration function, at electronic mutual inductor
Exporting known amplitude and the standard signal of phase place under calibration mode, standard signal has different known for different equipment
Amplitude and phase place, its value is fixed value；Signal processing unit 13 is for sensing head 11 or standard direct voltage source 12
The signal of output processes and changes, and issues combining unit 21 and carry out calculating or comparison；Variable connector 14 is used for
The control signal sent according to control unit 15, switches between sensing head 11 and standard direct voltage source 12,
The output signal of sensing head 11 end or standard direct voltage source 12 end is linked in signal processing unit 13, carries out letter
Number process conversion, variable connector 14 is grammed switch；Control unit 15 is for according to combining unit 21 or remotely sending
Control instruction, control variable connector 14 and switch to standard direct voltage source 12 side, disconnect the signal of sensing head 11 side
And make the signal of standard direct voltage source 12 be linked in signal processing unit 13, combining unit 21 to carry out to process and calculate,
Realize electronic mutual inductor self-calibration function.
Signal processing unit 13 for sensing head 11 end or standard direct voltage source 12 are terminated into signal data carry out
Process and conversion, specifically include data acquisition, A/D conversion, Filtering Processing, opto-electronic conversion and data and send, photoelectricity
Conversion processes for the optical signal of entering signal processing unit 13 is changed into the signal of telecommunication, and the electricity after processing
Signal is converted into optical signal and is sent to combining unit 21.
Electronic mutual inductor low-pressure side 20 includes combining unit 21, and combining unit 21 is based on carrying out the signal received
Calculate or comparison, and communicate with follow-up measurement apparatus or control device.Combining unit 21 includes guidance panel
211 and correction verification module 212, guidance panel 211 is for arranging mode of operation and the display calibration of selected electronic mutual inductor
As a result, can allow the manual setting or remotely located in user scene, mode of operation has two kinds, and i.e. electronic mutual inductor is just
Often mode of operation or calibration mode；Correction verification module 212 is under electronic mutual inductor calibration mode, by combining unit
21 calculated standard source measured values contrast with standard source theoretical value, obtain ratio and the angle of electronic mutual inductor
Difference, it is achieved the self-calibration function of electronic mutual inductor, it is also possible to whether judge the harvester in signal processing unit 13
Working properly.Correction verification module 212 provides the platform of transformer data calibration, it is possible to according to combining unit 21 measured value with
Known standard value is calculated transformer error result.
In day-to-day operation, electronic mutual inductor runs in the normal mode of operation, function and ordinary electronic formula transformer one
Causing, variable connector 14 is switched to sensing head 11 side, sensing head 11 gathers signal, through variable connector 14 and letter
Number processing unit 13, then carried out data calculating by combining unit 21, standard direct voltage source 12 is in holding state,
Do not export any signal；When needs are calibrated, electronic mutual inductor runs in the calibration mode, and variable connector 14 disconnects
With the signal of sensing head 11 switch to standard direct voltage source 12 side, standard direct voltage source 12 is by control unit
15 control, and the signal of output known amplitude and phase place, as standard signal source, also serves as electronic mutual inductor measured signal
Source, signal processing unit 13, combining unit 21 through electronic mutual inductor carry out process and are calculated measured value (i.e.
Actual measured value), by calibration module 212 by theoretical value (the i.e. mark of standard signal of measured value Yu standard signal source
Quasi-value) contrast, calculate error, obtain ratio and the angular difference value of electronic mutual inductor, the operation of combining unit
The calibration results such as the ratio and the angular difference that show electronic mutual inductor on panel, decide whether as required by ratio and angular difference
Value complement is repaid to combining unit, it is achieved the self-calibration function of electronic mutual inductor.
Additionally, for meeting higher accuracy requirement and stability requirement, standard direct voltage source 12 uses preferably screen
Cover measure and constant temperature measures, to ensure higher accuracy, such as use double-layer shielding structure, i.e. wrap up in high-pressure side
Thicker iron-clad and the shielding measure that the realization of parcel iron sheet has been taught on related circuit plate, make standard source at the big electricity of high pressure
Stream electromagnetic environment has stronger Immunity Performance；The most such as use temperature sensor, monitoring standard direct voltage source 12 institute
The ambient temperature at place, and by constant for ambient temperature at 40 DEG C-50 DEG C, make standard source have in high-voltage great-current electromagnetic environment
There is stronger thermostatic characteristics.
As the further improvement of above-described embodiment, standard direct voltage source, variable connector and control unit are integrated in electricity
The high-pressure side of minor transformer, guidance panel and correction verification module are integrated in the combining unit of electronic mutual inductor low-pressure side.
As the further improvement of above-described embodiment, electronic mutual inductor, when normally measuring, can realize regular or remote
Process control its calibrate, standard direct current source signal is measured by the Acquisition Circuit of control signal processing and control element (PCE),
Compare with its theoretical value, it is judged that the Acquisition Circuit work in electronic mutual inductor signal processing unit is the most normal.
According to a further aspect in the invention, based on above-mentioned principle, it is provided that the method for self-calibrating of a kind of electronic mutual inductor,
Owing to principle is corresponding with above-described embodiment, do not repeat them here.Method for self-calibrating comprises the steps:
Combining unit obtains the mode of operation of the electronic mutual inductor that user selectes, and according to mode of operation to control unit
Send control instruction, control the variable connector signal switching at sensing head end or standard direct voltage source end.In normal work
Under operation mode, variable connector leads to sensing head side joint；In the calibration mode, variable connector and standard direct voltage source side
Connect.
The sensing head working signal of access or the standard signal of standard direct voltage source are processed by signal processing unit
After conversion, input to combining unit.Concrete, under electronic mutual inductor normal operation mode of operation, function with
Ordinary electronic formula transformer is consistent, does not export any signal, sensing head at standard direct voltage source in the standby state
Output services signal processes to signal processing unit and changes；Under electronic mutual inductor runs calibration mode, mark
The signal of quasi-direct voltage source output known amplitude and phase place, as standard signal, exports to signal processing unit
Reason and conversion.
Combining unit carries out different process according to selected mode of operation, calculates and export.Concrete, in electronic type
Under transformer normal operation mode of operation, the voltage and current signal of combining unit output digital quantity；At electronic mutual inductor
Running under calibration mode, the calibration module of combining unit is by the theory of calculated for combining unit measured value Yu standard source
Value contrasts, and obtains ratio and the angular difference value of electronic mutual inductor, shows afterwards on the guidance panel of combining unit.
The electronic mutual inductor of the band self-calibration function of the embodiment of the present invention is compared with ordinary electronic formula transformer, at electronics
Formula transformer high voltage side is integrated with standard DC power supply, combining unit is integrated with transducer check module, and then
It is capable of the self-calibration function of electronic mutual inductor.The present invention passes through integration standard source and correction verification module, single merging
The data that standard source data and the combining unit of acquisition process are contrasted by unit, the error of monitoring electronic mutual inductor
Characteristic, it is achieved the regular self calibration to electronic mutual inductor, establishes the electronic mutual inductor of a cuff self-calibration function,
Greatly promote the application development of electronic mutual inductor.
This patent compares existing patented technology, it is not necessary to extra electromagnetic transformer just can realize as standard device
The on-line calibration function of electronic mutual inductor.The invention provides the electronic mutual inductor of a kind of band self-calibration function, energy
The on-line calibration function of electronic mutual inductor is realized, for electronic type in the case of there are currently no standard metering devices the most in fact
The on-line condition monitoring of transformer has important impetus so that the on-line monitoring of electronic mutual inductor is convenient soon
Prompt, it is possible to achieve calibrating for error and fault diagnosis under not having a power failure, it is greatly improved O&M overhaul efficiency, solves the fortune that has a power failure
The cost of dimension, it is possible to realize the long charged operation of electronic mutual inductor.
Each embodiment in this specification all uses the mode gone forward one by one to describe, identical similar portion between each embodiment
Dividing and see mutually, what each embodiment stressed is the difference with other embodiments.Especially for
For device or system embodiment, owing to it is substantially similar to embodiment of the method, so describing fairly simple, relevant
Part sees the part of embodiment of the method and illustrates.Apparatus and system embodiment described above is only schematically
, the wherein said unit illustrated as separating component can be or may not be physically separate, as list
The parts of unit's display can be or may not be physical location, i.e. may be located at a place, or can also divide
Cloth is on multiple NEs.Some or all of module therein can be selected according to the actual needs to realize this reality
Execute the purpose of example scheme.Those of ordinary skill in the art, in the case of not paying creative work, are i.e. appreciated that also
Implement.
The foregoing is only the preferred embodiments of the invention, be not limited to the claims of the present invention.
The most described above, for those skilled in the technology concerned it would be appreciated that and implement, therefore other are based on this
The equivalent that bright disclosure is completed changes, and should be included in the covering scope of the claims.
Claims (10)
1. an electronic mutual inductor for band self-calibration function, including sensing head, signal processing unit and combining unit, its
It is characterised by, also includes standard DC power supply, variable connector, control unit and calibration module:
Described sensing head is for output services signal under described electronic mutual inductor normal mode of operation；
Described standard direct voltage source is as standard source, for exporting known amplitude under described electronic mutual inductor calibration mode
Standard signal with phase place；
Described signal processing unit carry out processing for the signal that described sensing head or described standard direct voltage source are exported and
Conversion, and issue described combining unit and carry out calculating or comparison；
Described variable connector is for the control signal sent according to described control unit, at described sensing head and described standard direct current
Switch between voltage source；
Described control unit, for according to described combining unit or the control instruction remotely sent, controls the switching of described variable connector
To described standard direct voltage source side；
Described combining unit for receive signal calculate or comparison, and with follow-up measurement apparatus or control device
Communicate；
Described calibration module is under described electronic mutual inductor calibration mode, by calculated for described combining unit standard
Source measured value contrasts with standard source theoretical value, obtains ratio and the angular difference value of described electronic mutual inductor, it is achieved electronic type
The self-calibration function of transformer and/or judge that the Acquisition Circuit work in described signal processing unit is the most normal.
The electronic mutual inductor of a kind of band self-calibration function the most according to claim 1, it is characterised in that: described electricity
Minor transformer also includes guidance panel, described guidance panel for arrange the mode of operation of selected described electronic mutual inductor with
And display calibration result.
The electronic mutual inductor of a kind of band self-calibration function the most according to claim 2, it is characterised in that: described school
Quasi-mode block and described guidance panel are integrated in described combining unit.
The electronic mutual inductor of a kind of band self-calibration function the most according to claim 2, it is characterised in that: described biography
Sense head, standard direct voltage source, signal processing unit, variable connector and control unit are positioned at the height of described electronic mutual inductor
Pressure side；Described combining unit, calibration module and guidance panel are positioned at the low-pressure side of described electronic mutual inductor.
The electronic mutual inductor of a kind of band self-calibration function the most according to claim 1, it is characterised in that: described letter
Number processing unit includes that data acquisition, A/D conversion, Filtering Processing, opto-electronic conversion and data send, and described opto-electronic conversion is used
Process in the optical signal of entering signal processing unit is changed into the signal of telecommunication, and will process after the signal of telecommunication be converted into light
Signal is sent to described combining unit.
The electronic mutual inductor of a kind of band self-calibration function the most according to claim 1, it is characterised in that: described many
Way switch is grammed switch.
The electronic mutual inductor of a kind of band self-calibration function the most according to claim 1, it is characterised in that:
When described electronic mutual inductor operates in normal mode of operation, described variable connector connects with described sensing rostral, by
Described sensing head gathers signal, transmits to described combining unit through described variable connector and signal processing unit, then by described
Combining unit carries out data calculating, and described standard direct voltage source is in holding state, does not export any signal；
When described electronic mutual inductor operates in calibration mode, described variable connector disconnects the signal with described sensing head and cuts
Shifting to described standard direct voltage source side, described standard direct voltage source is controlled by described control unit, output known amplitude and
The signal of phase place, as standard signal source, also serves as electronic mutual inductor measured signal source, through described signal processing unit 13,
Combining unit 21 carries out process and is calculated measured value, by described calibration module by the standard value of measured value Yu standard signal
Contrast, obtain ratio and the angular difference value of electronic mutual inductor, and on described guidance panel, show the school such as ratio and angular difference
Quasi-result, decides whether to repay to described combining unit by ratio and angular difference value complement as required, it is achieved electronic mutual inductor from
Calibration function.
The electronic mutual inductor of a kind of band self-calibration function the most according to claim 1, it is characterised in that: described mark
Quasi-direct voltage source uses shielding measure and constant temperature measures to ensure accuracy requirement and stability requirement.
The electronic mutual inductor of a kind of band self-calibration function the most according to claim 8, it is characterised in that: described screen
The measure of covering is double-layer shielding structure, wraps up thicker iron-clad in high-pressure side and wraps up iron sheet on related circuit plate；Described perseverance
Temperature measure uses temperature sensor, monitors the ambient temperature residing for described standard direct voltage source, and by constant for ambient temperature
40℃-50℃。
10. a method for self-calibrating for electronic mutual inductor, described method comprises the steps:
Combining unit obtains the mode of operation of the electronic mutual inductor that user selectes, and sends to control unit according to mode of operation
Control instruction, controls variable connector and switches at the signal of sensing head end or standard direct voltage source end, in the normal mode of operation,
Variable connector leads to sensing head side joint；In the calibration mode, variable connector leads to standard direct voltage source side joint；
The signal processing unit sensing head working signal to accessing or the standard signal of standard direct voltage source carry out processing and
After conversion, input to combining unit；
Described combining unit carries out different process according to selected mode of operation, calculates and export.
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| 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 |
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| CN109991493A (en) * | 2019-03-25 | 2019-07-09 | 珠海格力电器股份有限公司 | Electric energy monitoring method, device, equipment and system |
| CN109991493B (en) * | 2019-03-25 | 2020-05-19 | 珠海格力电器股份有限公司 | Electric energy monitoring method, device, equipment and system |
| CN112629575B (en) * | 2019-09-24 | 2023-10-17 | 罗斯蒙特公司 | Process variable sensor testing |
| CN112629575A (en) * | 2019-09-24 | 2021-04-09 | 罗斯蒙特公司 | Process variable sensor testing |
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| CN112305483A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Self-calibration voltage monitor and calibration method thereof |
| CN112924915B (en) * | 2021-01-27 | 2023-11-21 | 云南电网有限责任公司电力科学研究院 | Mutual calibration system and method for voltage monitors |
| CN112924915A (en) * | 2021-01-27 | 2021-06-08 | 云南电网有限责任公司电力科学研究院 | Mutual calibration system and method for voltage monitor |
| CN117630790A (en) * | 2023-12-06 | 2024-03-01 | 国网宁夏电力有限公司营销服务中心(国网宁夏电力有限公司计量中心) | Voltage transformer on-line monitoring device and method with self-diagnosis function |
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Application publication date: 20160810 |