CN107167710A - Pressure test method based on Multifunctional coil kind equipment testing synthesis parameter device - Google Patents
Pressure test method based on Multifunctional coil kind equipment testing synthesis parameter device Download PDFInfo
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- CN107167710A CN107167710A CN201710390746.1A CN201710390746A CN107167710A CN 107167710 A CN107167710 A CN 107167710A CN 201710390746 A CN201710390746 A CN 201710390746A CN 107167710 A CN107167710 A CN 107167710A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
The present invention relates to a kind of pressure test method based on Multifunctional coil kind equipment testing synthesis parameter device：The display control section of test device is according to the user operation instruction received, to control program control experiment power supply to the sine wave experiment power supply of equipment under test output voltage continuously adjustabe；The electric current and voltage signal of experiment power supply are acquired by measuring meter；After the experiment power supply exported, which has passed through over-pressed judgement, interruption, to be judged, in the way of display control section controls the program control experiment power supply in terms of the time falls, the voltage for reaching voltage setting is persistently exported to equipment under test, until reaching defined test period.The present invention can perform the pressure test of coil kind equipment (voltage transformer, transformer etc.) with high efficient and reliable, and automaticity is high, be that electric power detection service work brings great convenience.
Description
Technical field
It is more particularly to a kind of to be integrated based on Multifunctional coil kind equipment the present invention relates to a kind of comprehensive electric testing device
The pressure test method of parameter test device.
Background technology
Coil kind equipment (such as all kinds of transformers, transformer) occupies extremely important in the various kinds of equipment of power system
Status, and its electrical test project is often more and more complicated compared with project for other equipment.Coil class is directed in the market
Each experiment of equipment all needs to configure a set of Special test instrument substantially, and test apparatus is all more heavy.Therefore one is completed to set
Standby experiment generally requires many instruments.The factors such as place and power supply are limited to, need repeatedly to remove instrument in working at the scene
Before remove after and wiring is repeated several times, operating efficiency is relatively low.
Specifically, in transformer and power transformer electrical test, set using discrete detection
For what is tested.Experiment power supply is generally adjusted using power controling box (pressure regulator).Coordinate various voltmeters, electric current again
The meter such as table and power meter is measured.Power controling box is mainly what is be made up of an automatic coupling voltage regulator, it usually needs artificial
Operation regulation, process of the test needs are artificial to adjust voltage when observing meter, must record corresponding measurement result.To operator
The requirement of member is higher, and operating process is also comparatively laborious, is unfavorable for realizing automatic measurement.With the development of electronic technology, welcome
In the digitized epoch, measuring instrument is also towards intellectuality, and digital development, current most measuring instrument all has been carried out
Digitlization, but experiment electricity is generally still used as using automatic coupling voltage regulator in the experiments such as industrial frequency withstand voltage, idling load and C-V characteristic
Source, substantially based on manual operations.Joint connection in site power controling box and measurement meter are needed during experiment, it is more time-consuming,
Automaticity is not high.
At present both at home and abroad in terms of the research of comprehensive electric testing device or relatively more rare, most of instruments are also all deposited
Single in function, the form of the equipment output result of different manufacturers also disunity is also made to the data analysis sorting and file in later stage
Into many troubles.
The content of the invention
It is an object of the invention to provide a kind of pressure-resistant examination based on Multifunctional coil kind equipment testing synthesis parameter device
Proved recipe method, can bring great convenience for electric power detection service work.
In order to achieve the above object, join the technical scheme is that providing a kind of integrated based on Multifunctional coil kind equipment
The pressure test method of number test device：
The display control section of test device is according to the user operation instruction received, to control the program control examination of test device
Sine wave experiment power supply from electrical verification source to equipment under test output voltage continuously adjustabe；
The electric current and voltage signal for the experiment power supply that the measurement meter of the test device is exported to program control experiment power supply
It is acquired, and is sent to the display control section and carries out data processing；
The display control section carries out over-pressed judgement to experiment power supply, to judge that the voltage of exported experiment power supply is
The no voltage setting for reaching pilot project；
When voltage reaches voltage setting, the display control section carries out interruption judgement, to judge whether in appearance
The situation of disconnected measurement；
When there is not the situation for interrupting measurement, in the way of controlling the program control experiment power supply in terms of the time falls, to tested
Equipment persistently exports the voltage for reaching voltage setting；
Fallen in the time during meter, time judgement is carried out by the display control section, output voltage setting is judged
Time whether reach pilot project required time setting；
When reaching time rule value, terminate pressure test.
Preferably, when pilot project is industrial frequency withstand voltage experiment, the display control section first carries out another time and interrupts judgement,
In the case where measurement is interrupted in no appearance, the program control experiment power supply is controlled in automatic boosting mode, the experiment to being exported
The voltage of power supply is lifted, after determining that voltage reaches power-frequency voltage in judging in overvoltage, is continued executing with overvoltage and is judged it
Process of the test afterwards.
Preferably, when pilot project is the automatic measurement of induced over voltage withstand test, the display control section first carries out another
Secondary interrupt judges, in the case where measurement is interrupted in no appearance, the program control experiment power supply is controlled in automatic boosting mode, to institute
The voltage of the experiment power supply of output is lifted, and after determining that voltage reaches voltage setting in overvoltage judging, continues to hold
Process of the test after row overvoltage judgement.
Preferably, when pilot project is the manual measurement of induced over voltage withstand test, the display control section is grasped according to user
Instruct, the frequency values, test voltage value, over-voltage and over-current value, test period to experiment power supply one or more of parameter
It is configured；
Then in measurement process, after judging by the overvoltage judgement, interruption, the program control experiment power supply is fallen with the time
The mode of meter, the experiment power supply that voltage reaches set test voltage value is persistently outputed to equipment under test；Until described aobvious
Show that control section passage time judges, it is determined that reaching set test period.
Preferably, before the interruption judgement is carried out, further comprising procedure below：
The display control section carries out key scan, determines whether that button is pressed：
If no button is pressed, carry out excessively stream judgement and power supply judges, and exceed institute in the voltage and electric current collected
During the over-voltage and over-current value of setting, interruption protection is carried out；
If button is pressed, then the corresponding function of button is judged：
If it is the instruction of time adjustment that button is corresponding, test period is adjusted by display control section；
If it is the instruction of voltage-regulation that button is corresponding, over-pressed judgement, and the test voltage after regulation is judged are carried out
When value is not above given threshold, test voltage value is adjusted by display control section；Otherwise, if it is determined that after regulation
Test voltage value exceed given threshold, then perform overvoltage protection；
If corresponding button is the instruction for starting measurement, measurement process is proceeded by.
Preferably, interrupt and judge further to include：
Excessively stream judges, when judging that the electric current of institute's output test power supply exceedes the current specification value of pilot project requirement, interrupts
Measurement；
Power supply judges, when judging institute's output test power interruptions, interrupts measurement；
Key scan, judges to have the button of correspondence measurement interrupt instruction or switch the buttons of other pilot projects to be pressed
When, interrupt measurement.
Preferably, the display control section, is further included：
The master control borad that 32 ARM single-chip microcomputers are constituted, and the liquid crystal display, non-volatile being connected with the master control partitioned signal
Property memory, printer, button, external memory interface and communication interface；
The master control borad of the display control section, is also scored by internal serial ports and the program control experiment power supply and measurement table
Do not connect, be controlled and data transfer.
Preferably, the program control experiment power supply is provided with the single-chip microcomputer for carrying out SPWM modulation controls, to IPM switch modules
It is controlled, to be driven by realizing that two opposite polarity reference sine waves and two-way triangular carrier are handed over to cut to produce power switch
Dynamic signal.
Preferably, the measurement meter includes measuring current transformer and voltage transformer, with the Current Mutual Inductance
The programmable amplifier that device, voltage transformer are accordingly connected, the analog-digital converter being connected with the programmable amplifier, with the modulus
The single-chip microcomputer of converter connection, and with measuring memory and the serial port module that the single-chip microcomputer of meter is connected.
Preferably, the equipment under test is coil kind equipment, includes voltage transformer or transformer.
Pressure test method of the present invention based on Multifunctional coil kind equipment testing synthesis parameter device, its advantage exists
In：
1st, rational functional module is integrated with test device, testing equipment quantity is effectively reduced；
2nd, coil kind equipment pressure test (inducting-voltage proof or the industrial frequency withstand voltage examination of such as voltage transformer is realized to high efficient and reliable
Test, the pressure test of transformer etc.), automaticity is high；
3rd, can there is provided the three phase frequency changing power of Frequency Adjustable amplitude modulation based on Power Electronic Technique；
4th, the measurement and calculating of the data such as voltage, electric current, power are realized by single-chip microcomputer and correlation acquisition module, is finally adopted
Liquid crystal display output result is used, and realizes the functions such as drafting exciting characteristic curve；
5th, connection plan is safe and simple, at utmost reduces work on the spot amount.
Test device of the present invention and its pressure test method, once make in each grid company and equipment manufacturer's input
With, it will directly be brought great convenience for electric power detection service work, the safe operation of power network is effectively ensured, raising power network
Level of security, it is to avoid the generation of major accident, the direct or indirect economic benefit that can be produced is huge.
Brief description of the drawings
Fig. 1 is the connection diagram of display control section in test device of the present invention；
Fig. 2 is the schematic diagram of program control experiment power supply in test device of the present invention；
Fig. 3 is the schematic diagram of measurement meter in test device of the present invention；
Fig. 4 is the wiring diagram that test device of the present invention carries out transformer induction pressure test；
Fig. 5 is that A of the test device of the present invention in transformer induction pressure test is added crimping line chart；
Fig. 6 is that test device of the present invention performs the flow chart that industrial frequency withstand voltage and inducting-voltage proof are tested automatically；
Fig. 7 is the flow chart that test device of the present invention carries out manual measurement in induced over voltage withstand test.
Embodiment
As shown in figure 1, Multifunctional coil kind equipment testing synthesis parameter device of the present invention, includes three big parts：It is aobvious
Show control (man-machine interface) part, program control experiment power supply, multifunctional measuring meter.
Wherein, the display control section can receive user operation instruction, control program control experiment power supply and measurement meter
Each work in order, and show, print, preserve measurement result.Using 32 ARM single-chip microcomputers as core in this example, cooperation 320 ×
240 liquid crystal displays are provided with mini-printer as human-computer interaction interface, device, interior for printing out measurement result
Attached nonvolatile memory, for preserving measurement result.External memory interface and communication interface are also configured, for on-line operation.The portion
Parallel circuit is controlled by internal serial ports with program control experiment power supply and measurement meter part and transmitted with data.So that device can root
Automatic measurement is carried out according to the function of user preset.
As shown in Fig. 2 the program control experiment power supply replaces traditional self-coupling using program-controlled electronic voltage regulator
Device, it has pressure-adjustable frequency modulation function, and output voltage frequency stability is good.Based on SPWM modulation principles, two polarity phases are utilized
Anti- reference sine wave is handed over to cut with two-way triangular carrier produces power switch drive signal.Software journey is passed through with single-chip microcomputer in this example
Sequence programming realization SPWM modulating waves, control the work of high-power IPM switch modules, pass through feedback voltage and sampled voltage ratio ratio
Relatively control dutycycle realizes voltage stabilizing.The number for the SPWM modulation techniques design being so controlled by high-performance digital signal processor
Word power supply, the sine wave experiment power supply of exportable voltage continuously adjustabe.
As shown in figure 3, the multifunctional measuring meter, by a piece of High Performance SCM respectively to experiment when voltage,
Current signal carries out real-time sampling calculating, draws the electric parameters such as voltage, electric current, active power, power factor and frequency.In this example
High performance double 16 analog-digital converters are employed, main data acquisition chip are used as, it is ensured that the high accuracy of measurement.Measurement
Principle uses synchronous high-speed Sampling techniques, synchronizes sampling to voltage and current signal, sampled data is stored in into memory
In, then sampled data is carried out according to electrotechnics principle to calculate the measurement result for obtaining each electrical parameter.
Based on the test device, such as inducting-voltage proof, C-V characteristic and the no-load current that can complete voltage transformer
Experiment；At least more than 3 integrated functionalities such as inducting-voltage proof, the short-circuit impedance of 35kV and following voltage class transformer are completed, and
Disposable wiring can be realized, without external any equipment；(need to be purchased in addition) by external experiment power supply, can complete 110kV and
The attribute testing of above main transformer；Capacitive apparatus Resonance Voltage Withstand Test can be carried out as variable-frequency power sources, and simultaneously
With automatic tuning and manual tuning both of which；With multinomial defencive functions such as over-voltage and over-current overload excess temperatures, with automatic liter
Decompression and manually operated both of which.
As shown in figure 4, test device is carried out in the example of transformer induction pressure test, the power supply on test device main frame
Output end connects primary coil a, the x ends of transformer to be measured, transformer secondary coil A, X end is respectively as High voltage output and connects
The node in the middle of two electric capacity, the two electric capacity is connected between ground terminal, A, X ends also by a standard capacitor divider, connection
It is used for carrying out the port of on-line operation on to test device main frame, test data is provided to the display control section of test device.
As shown in figure 5, when test device carries out A addition compression bonded lines in transformer induction pressure test, test device master
Power output end on machine connects low-voltage side coil a, the n ends of Y-connection on three-phase transformer to be measured, the high-pressure side of transformer
Coil triangle is connected, and is connected between A, C-terminal the node in the middle of two electric capacity, the two electric capacity and is also passed through a standard electric
Hold divider, be connected to and be used for the port for carrying out on-line operation on test device main frame, to the display control section of test device
Test data is provided.Wiring is similar when B, C phase are pressurizeed.
The pressure test that the present invention is carried out using the test device, includes industrial frequency withstand voltage and inducting-voltage proof, industrial frequency withstand voltage
It is directly to be measured with power frequency, inducting-voltage proof is measured after can entering line frequency and other parameter settings.
It as shown in fig. 6, Frequency Design need not be carried out in industrial frequency withstand voltage experiment, can directly measure, wrap after wiring
Containing following program circuit：Industrial frequency withstand voltage pilot project is selected in the human-computer interaction interface of display control section, test device is entered
Row key scan, to perform act corresponding with the project.Interruption judgement is first carried out, such as when excessively stream judges to find to exceed power frequency
Current value as defined in pressure test, or when judging to find power supply accidental interruption by power supply, or scanning discovery presses interruption
Button or when switching the button of other pilot projects, interrupts measurement.
If not interrupting the situation of measurement, test device can be by program control experiment power supply, in the way of automatic boosting
Power supply is provided to Devices to test (transformer, transformer etc.), and over-pressed judgement is carried out to the voltage of power supply, until voltage reaches
To threshold value (such as this example is power-frequency voltage).Interruption judgement is carried out again, if not interrupting the situation of measurement, makes test device
By program control experiment power supply, fallen using the time in terms of in the way of provide the voltage of above-mentioned threshold value as power supply to Devices to test, and to supplying
The electric time is judged, until power-on time reaches the threshold value of test period.During experiment, test device can be tried industrial frequency withstand voltage
The data tested are calculated, and show the various information such as corresponding data, result of the test in man-machine interface.
As shown in fig. 7, carrying out manual measurement in induced over voltage withstand test, it can tested according to live requirement of real time
Measured again after directly adjusting the parameters such as test voltage, test period manually in journey.During parameter setting, it can mainly correspond to certainly
Magnitude of voltage, over-voltage and over-current value required for dynamic boosting, test period are configured.Induced over voltage withstand test includes following program flow
Journey：
The manual test project of induced over voltage withstand test is selected in the human-computer interaction interface of display control section, test device is entered
Row key scan, to perform act corresponding with the project.First carry out excessively stream judgement and power supply judges, if finding respective interrupt feelings
Condition then carries out interruption protection.
Also judged by button, it is corresponding to key command when user gives a certain instruction during validation test
Function is judged：If corresponding respective keys are time adjustment instructions, the test device Control experiment time is adjusted；
, then, can phase when carrying out over-pressed judgement and determining that the voltage after regulation is not above given threshold if voltage-regulation is instructed
Magnitude of voltage (if more than voltage threshold, switching to perform overvoltage protection process) should be adjusted；If starting measurement instruction, then carry out
Start follow-up measurement process.Period, test device can show to parameter before and after regulation etc., and according to the ginseng of adjustment
Number calculates the corresponding data of experiment (be, for example, the SPWM modulation datas of program control experiment power supply, but not limited to this).
Start to start after measurement, still provide for similar interruption and judge (key scan, excessively stream judge, power supply judges etc.), go out
Measurement is interrupted when existing over-voltage and over-current or accidental interruption, otherwise in terms of the time falls in the way of provide setting electricity to Devices to test
Pressure value judges as power supply, and to power-on time, until power-on time reaches normal termination flow after the time value of setting.
During experiment, test device is calculated the data of induced over voltage withstand test, and shows corresponding data, experiment knot in man-machine interface
The various information such as fruit.
The automatic measurement that the present invention is carried out in induced over voltage withstand test, similar with flow shown in Fig. 6, the automatic measurement is certainly
It is dynamic to boost to magnitude of voltage set in parameter setting, then powered with the magnitude of voltage and maintain the test period in parameter setting
Measure, whole process carries out over-voltage and over-current and accidental interruption judges.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of pressure test method based on Multifunctional coil kind equipment testing synthesis parameter device, it is characterised in that：
The display control section of test device is according to the user operation instruction received, to control the program control experiment electricity of test device
Sine wave experiment power supply from source to equipment under test output voltage continuously adjustabe；
The electric current and voltage signal for the experiment power supply that the measurement meter of the test device is exported to program control experiment power supply are carried out
Collection, and it is sent to the display control section progress data processing；
The display control section carries out over-pressed judgement to experiment power supply, to judge whether the voltage of exported experiment power supply reaches
To the voltage setting of pilot project；
When voltage reaches voltage setting, the display control section carries out interruption judgement, to judge whether to occur to interrupt to survey
The situation of amount；
When there is not the situation for interrupting measurement, in the way of controlling the program control experiment power supply in terms of the time falls, to equipment under test
Lasting output reaches the voltage of voltage setting；
Fallen in the time during meter, time judgement carried out by the display control section, judge output voltage setting when
Between whether reach pilot project required time setting；
When reaching time rule value, terminate pressure test.
2. pressure test method as claimed in claim 1, it is characterised in that
When pilot project is industrial frequency withstand voltage experiment, the display control section first carries out another time and interrupts judgement, is not occurring
In the case of interrupting measurement, the program control experiment power supply is controlled in automatic boosting mode, to the voltage of the experiment power supply exported
Lifted, after determining that voltage reaches power-frequency voltage in judging in overvoltage, continue executing with the experiment after overvoltage judges
Journey.
3. pressure test method as claimed in claim 1, it is characterised in that
When pilot project is the automatic measurement of induced over voltage withstand test, the display control section first carries out another time and interrupts judgement,
In the case where measurement is interrupted in no appearance, the program control experiment power supply is controlled in automatic boosting mode, the experiment to being exported
The voltage of power supply is lifted, and after determining that voltage reaches voltage setting in judging in overvoltage, continues executing with over-pressed judgement
Process of the test afterwards.
4. pressure test method as claimed in claim 1, it is characterised in that
When pilot project is the manual measurement of induced over voltage withstand test, the display control section is according to a user operation instruction to examination
The frequency values in electrical verification source, test voltage value, over-voltage and over-current value, test period one or more of parameter be configured；
Then in measurement process, after judging by the overvoltage, interrupting and judge, in terms of the program control experiment power supply was fallen by the time
Mode, the experiment power supply that voltage reaches set test voltage value is persistently outputed to equipment under test；Until the display control
Part passage time processed judges, it is determined that reaching set test period.
5. pressure test method as claimed in claim 4, it is characterised in that
Before the interruption judgement is carried out, further comprising procedure below：
The display control section carries out key scan, determines whether that button is pressed：
If no button is pressed, carry out excessively stream judgement and power supply judges, and in the voltage and electric current collected more than set
Over-voltage and over-current value when, carry out interruption protection；
If button is pressed, then the corresponding function of button is judged：
If it is the instruction of time adjustment that button is corresponding, test period is adjusted by display control section；
If it is the instruction of voltage-regulation that button is corresponding, over-pressed judgement is carried out, and the test voltage value after regulation is judged does not have
When having more than given threshold, test voltage value is adjusted by display control section；Otherwise, if it is determined that regulation after examination
Magnitude of voltage is tested more than given threshold, then performs overvoltage protection；
If corresponding button is the instruction for starting measurement, measurement process is proceeded by.
6. the pressure test method as described in any one in claim 1-5, it is characterised in that
Interrupt and judge further to include：
Excessively stream judges, when judging that the electric current of institute's output test power supply exceedes the current specification value of pilot project requirement, interrupts measurement；
Power supply judges, when judging institute's output test power interruptions, interrupts measurement；
Key scan, when judging to have the button of correspondence measurement interrupt instruction or switching the buttons of other pilot projects and be pressed, in
Disconnected measurement.
7. pressure test method as claimed in claim 1, it is characterised in that
The display control section, is further included：
The master control borad that 32 ARM single-chip microcomputers are constituted, and be connected with the master control partitioned signal liquid crystal display, non-volatile deposit
Storage, printer, button, external memory interface and communication interface；
The master control borad of the display control section, is also connected respectively by internal serial ports with the program control experiment power supply and measurement table meter
Connect, be controlled and data transfer.
8. pressure test method as claimed in claim 7, it is characterised in that
The program control experiment power supply is provided with the single-chip microcomputer for carrying out SPWM modulation controls, to be controlled to IPM switch modules, with
Power switch drive signal is produced by realizing two opposite polarity reference sine waves with the friendship section of two-way triangular carrier.
9. pressure test method as claimed in claim 8, it is characterised in that
The measurement meter includes measuring current transformer and voltage transformer, with the current transformer, mutual induction of voltage
The programmable amplifier that device is accordingly connected, the analog-digital converter being connected with the programmable amplifier is connected with the analog-digital converter
Single-chip microcomputer, and with measuring the memory that is connected of single-chip microcomputer and serial port module of meter.
10. pressure test method as claimed in claim 1, it is characterised in that
The equipment under test is coil kind equipment, includes voltage transformer or transformer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710390746.1A CN107167710A (en) | 2017-05-27 | 2017-05-27 | Pressure test method based on Multifunctional coil kind equipment testing synthesis parameter device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710390746.1A CN107167710A (en) | 2017-05-27 | 2017-05-27 | Pressure test method based on Multifunctional coil kind equipment testing synthesis parameter device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707173A (en) * | 2012-06-11 | 2012-10-03 | 吉林省电力有限公司延边供电公司 | Tester |
| CN103901332A (en) * | 2014-04-23 | 2014-07-02 | 国网上海市电力公司 | Three-phase frequency doubling sensing voltage-withstand test device |
| CN203720282U (en) * | 2014-01-09 | 2014-07-16 | 上海思创电器设备有限公司 | Transformer comprehensive parameter testing device |
| JP2014199209A (en) * | 2013-03-29 | 2014-10-23 | パナソニック株式会社 | Sensor unit, electric power measurement unit and electric power measurement system |
| CN204495898U (en) * | 2015-01-30 | 2015-07-22 | 国网上海市电力公司 | A kind of transformer superpotential on-line monitoring system |
-
2017
- 2017-05-27 CN CN201710390746.1A patent/CN107167710A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707173A (en) * | 2012-06-11 | 2012-10-03 | 吉林省电力有限公司延边供电公司 | Tester |
| JP2014199209A (en) * | 2013-03-29 | 2014-10-23 | パナソニック株式会社 | Sensor unit, electric power measurement unit and electric power measurement system |
| CN203720282U (en) * | 2014-01-09 | 2014-07-16 | 上海思创电器设备有限公司 | Transformer comprehensive parameter testing device |
| CN103901332A (en) * | 2014-04-23 | 2014-07-02 | 国网上海市电力公司 | Three-phase frequency doubling sensing voltage-withstand test device |
| CN204495898U (en) * | 2015-01-30 | 2015-07-22 | 国网上海市电力公司 | A kind of transformer superpotential on-line monitoring system |
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