CN110161446A - Relay protection device for high-voltage dc voltage mutual inductor - Google Patents
Relay protection device for high-voltage dc voltage mutual inductor Download PDFInfo
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- CN110161446A CN110161446A CN201910341179.XA CN201910341179A CN110161446A CN 110161446 A CN110161446 A CN 110161446A CN 201910341179 A CN201910341179 A CN 201910341179A CN 110161446 A CN110161446 A CN 110161446A
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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 discloses a kind of relay protection devices for high-voltage dc voltage mutual inductor, including high voltage direct current charge power supply, direct current square-wave generator, high voltage standard device, voltage transformer, transformer transient tester and the end PC etc., to realize the relay protection of voltage transformer by described high voltage direct current charge power supply etc.；And, the direct current square-wave generator includes several charging and discharging units for being connected in parallel and the relay switch component for controlling the charging and discharging cell operation state, therefore, the high-voltage electricity size that quantity by changing the charging and discharging unit can export the direct current square-wave generator is adjusted, to meet the relay protection requirement of the voltage transformer of different voltages grade.
Description
Technical field
The present invention relates to power grid detection technique field more particularly to a kind of transient state examinations for high-voltage dc voltage mutual inductor
Experiment device.
Background technique
High voltage dc transmission technology is widely used because having its remote, large capacity and without stationary problem the advantages that,
But due to the impedance loop very little in HVDC transmission system when DC side failure, occur in HVDC transmission system
Very big fault current can be generated when DC Line Fault, this, which just needs to control protection signal, has faster sample rate and broader
Bandwidth width, for the transient response of mutual inductor in DC transmission system, more stringent requirements are proposed for this, therefore, makes in mutual inductor
Field-checking is carried out to it and verification experimental verification is necessary with preceding.
According to the regulation in national standard GB/T 26217-2010 " HVDC transmission system DC voltage measuring device ", directly
" transient response " of galvanic electricity pressure measuring device is response of the secondary voltage to primary voltage temporal variations, it is required that in DC voltage
The high-voltage end of measuring device applies a step voltage of 10% or more measurement range, measures output end transient response, at this time
Response time should be not more than 250us, and need to provide a response time much smaller than the response time as test device
Voltage waveform reaches 10us magnitude.But due to lacking correlation theory research, lacking corresponding detection device, cause for voltage
The relay protection of mutual inductor cannot proceed normally.
Summary of the invention
For overcome the deficiencies in the prior art, technical problem solved by the invention is to provide a kind of for high voltage direct current
The relay protection device and control method of mutual inductor are pressed, relay protection can be carried out for the High Level DC Voltage mutual inductor to network.
In order to solve the above technical problems, the technical solution adopted in the present invention content is specific as follows:
A kind of relay protection device for high-voltage dc voltage mutual inductor, including high voltage direct current charge power supply, direct current side
Wave producer, high voltage standard device, voltage transformer, transformer transient tester and the end PC, in which: the high voltage direct current charging
Power supply is used to charge to the direct current square-wave generator, and the direct current square-wave generator is used to carry out the charging voltage received
Upgrade and by the voltage transmission after upgrading to the high voltage standard device and the voltage transformer, the transformer transient verification
Instrument is used to sample the signal that the high voltage standard device and the voltage transformer export and transmit the signal after sampling
To the end PC, the end PC is for calculating received signal, being stored and being shown.
Further, the direct current square-wave generator includes several charging and discharging units for being connected in parallel and for controlling
Make the relay switch component of the charging and discharging cell operation state, each charging and discharging unit include storage capacitor,
IGBT switch, first diode and the second diode, the first diode, the storage capacitor and second diode
It is connect after being sequentially connected in series with the IGBT switch in parallel.
Further, the relay switch component includes the first relay that the first diode input terminal is arranged in
Device switch, the second relay switch that the high voltage standard device and the voltage transformer output end is arranged in and setting are connecing
The third relay switch of the small resistance output end in ground.
Further, the transformer transient tester includes the first signal for connecting the high voltage standard device
Interface and second signal interface for connecting the voltage transformer.
Further, the relay protection device further includes the remote digital module being connected with the voltage transformer,
The output end of the remote digital module connects the transformer transient tester.
Further, the high voltage direct current charge power supply, the direct current square-wave generator, the high voltage standard device and institute
It states voltage transformer and is provided with ground terminal.
Further, the transformer transient tester includes and the high voltage standard device and the voltage transformer phase
The isolation sampling of connection and communication unit and with it is described be isolated sample the host that is connected with communication unit, the isolation is adopted
Sample is connect with communication unit with the host by optical fiber.
The invention also discloses a kind of transient test methods for high-voltage dc voltage mutual inductor, include the following steps:
S1: control the opening of relay switch component, disconnected state, so that the high voltage direct current charge power supply filling using setting
Piezoelectric voltage charges to the direct current square-wave generator；
S2: after direct current square-wave generator charging complete, control the opening of relay switch component, disconnected state are simultaneously turned on
IGBT switch, so that direct current square-wave generator discharges, and the voltage discharged is transferred to the high voltage standard device and institute
State voltage transformer；
S3: the signal that the transformer transient tester exports the high voltage standard device and the voltage transformer carries out
It samples and the signal after sampling is transmitted to the end PC；
S4: the end PC calculates received signal, stored and is shown.
Further, step S1 specifically: connect the first relay switch, disconnect the second relay switch, third relay
Device switch and IGBT switch, then the high voltage direct current charge power supply will charge to the direct current square-wave generator, and
Charging current will carry out charged in parallel for storage capacitor after flowing through the first diode.
Further, step S2 specifically: connect the second relay switch, disconnect the first relay switch and third relay
Device switch, conducting IGBT switch, then each first diode, storage capacitor and the second diode will discharge after series connection, and
And the voltage of release is transferred to the high voltage standard device and the voltage transformer.
Compared with prior art, the beneficial effects of the present invention are:
The invention discloses a kind of relay protection devices for high-voltage dc voltage mutual inductor, including high voltage direct current to charge
Power supply, direct current square-wave generator, high voltage standard device, voltage transformer, transformer transient tester and the end PC etc., to pass through
Described high voltage direct current charge power supply etc. realizes the relay protection of voltage transformer；Moreover, the direct current square-wave generator includes
Several charging and discharging units being connected in parallel and relay switch for controlling the charging and discharging cell operation state
Component, therefore, the high pressure that the quantity by changing the charging and discharging unit can export the direct current square-wave generator
TV university is small to be adjusted, to meet the relay protection requirement of the voltage transformer of different voltages grade.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the relay protection device of the present invention for High Level DC Voltage mutual inductor；
Fig. 2 is circuit diagram when direct current square-wave generator is in charged state；
Fig. 3 is circuit diagram when direct current square-wave generator is in discharge condition；
Fig. 4 is that the relay protection device of the present invention for High Level DC Voltage mutual inductor is utilized to carry out relay protection
Schematic diagram；
Fig. 5 is the flow diagram of the transient test methods of the present invention for high-voltage dc voltage mutual inductor；
Wherein, the appended drawing reference in Fig. 1-Fig. 4 are as follows:
1, high voltage direct current charge power supply；2, direct current square-wave generator；3, high voltage standard device；4, voltage transformer；5, mutual inductance
Device transient state tester；6, the end PC；7, isolation sampling and communication unit；8, host；9, remote digital module；10, first diode；
11, storage capacitor；12, IGBT is switched；13, the first relay switch；14, the second relay switch；15, third relay is opened
It closes；16, the second diode.
Specific embodiment
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Attached drawing and preferred embodiment, to specific embodiment, structure, feature and its effect according to the present invention, detailed description are as follows:
As shown in Figure 1, the invention discloses a kind of relay protection devices for high-voltage dc voltage mutual inductor comprising
High voltage direct current charge power supply 1, direct current square-wave generator 2, high voltage standard device 3, voltage transformer 4, transformer transient tester 5 with
And the end PC 6, in which: the high voltage direct current charge power supply 1 is used to charge to the direct current square-wave generator 2, the direct current square wave
Generator 2 is for upgrading the charging voltage received and by the voltage transmission after upgrading to 3 and of high voltage standard device
The voltage transformer 4, the transformer transient tester 5 is for defeated to the high voltage standard device 3 and the voltage transformer 4
Signal out is sampled and the signal after sampling is transmitted to the end PC 6, the end PC 6 be used for received signal into
Row is calculated, stores and is shown, to realize the relay protection of voltage transformer by described high voltage direct current charge power supply 1 etc..
In the present invention, the basic function of the high voltage direct current charge power supply 1 is the voltage for generating kV magnitude, and by voltage
It supplies the direct current square-wave generator 2 to boost, voltage value is continuously adjustable, included over-voltage, overcurrent and overheat protector function
Energy；The major function of the direct current square-wave generator 2 is risen to the charging voltage of the high voltage direct current charge power supply 1 input
Grade and by the voltage transmission after upgrading to the high voltage standard device 3 and the voltage transformer 4, and the amplitude of voltage uprating
The size of charging voltage depending on the high voltage direct current charge power supply 1 input and the inside electricity of the direct current square-wave generator 2
Road and cascade system；The voltage transformer 4 is the important primary equipment of DC transmission engineering high voltage appearance measurement；The high pressure
Standard 3 is used as measuring appliance, needs using preceding carry out measurement verification, and has waveform and rise the response time less than 1 μ s；
The end PC 6 is that the information received is calculated, stored and shown.
The direct current square-wave generator 2 includes several charging and discharging units for being connected in parallel and for controlling described fill
The relay switch component of discharge of electricity cell operation state, therefore, the quantity by changing the charging and discharging unit can be right
The high-voltage electricity size that the direct current square-wave generator 2 exports is adjusted, to meet the voltage transformer 4 of different voltages grade
Relay protection requirement.
As shown in Figures 2 and 3, each charging and discharging unit includes storage capacitor 11, IGBT switch the 12, the 1st
Pole pipe 10 and the second diode 16, the first diode 10, the storage capacitor 11 and second diode 16 are successively
It is connected in parallel after series connection with the IGBT switch 12；The relay switch component includes being arranged in the first diode
First relay switch 13 of 10 input terminals, second that 4 output end of the high voltage standard device 3 and the voltage transformer is set
Relay switch 14 and the third relay switch 15 for being grounded small resistance output end is set.
Specifically, as shown in Fig. 2, when the direct current square-wave generator 2 is in charged state, first relay is connected
Device switch 13 disconnects second relay switch 14 and the third relay switch 15, and the IGBT switch 12 is equal
It is in an off state；At this point, the high voltage direct current charge power supply 1 will charge to the direct current square-wave generator 2, charging
When, charging current will carry out charged in parallel for the storage capacitor 11 after flowing through the first diode 10.Assuming that charging electricity
Pressure is U0, then after charging, the voltage on each storage capacitor 11 is U0-(n+1)Vf, in which: n is 2 institute of direct current square-wave generator
The series for including, VfFor the forward conduction voltage drop of first diode 10, general 10 pressure drop of first diode can be ignored, can recognize
It is all U for the voltage after storage capacitors 11 at different levels charging0。
As shown in figure 3, the voltage of each storage capacitor 11 is U when the direct current square-wave generator 2 is in discharge condition0,
Each IGBT switch 12, the first diode 10 and second diode 16 are in off-state, and electric current is
Zero；Then the IGBT switches 12 at different levels are triggered to be connected, the triggering mode of the IGBT switch 12 is the synchronous touching of optical fiber, therefore,
Each first diode 10 and second diode 16 all turn off reverse bias, so that each storage capacitor 11 is gone here and there
Connection, which gets up, discharges to the high voltage standard device 3 and the voltage transformer 4, and more times of U is obtained in load0Negative pulse.
In addition, the direct current square-wave generator 2 also has standby mode, that is, disconnect the first relay switch 13 and second
Relay switch 14 is closed third relay switch 15, and the IGBT switch 12 is in controllable on state, thus by each
The electricity not discharged completely in the storage capacitor 11 is discharged by being grounded small resistance, to ensure the direct current square-wave generator 2
In operating condition in safety without pressure.
As shown in Figure 1, the transformer transient tester 5 includes the first letter for connecting the high voltage standard device 3
Number interface and the second signal interface for connecting the voltage transformer 4, when specific connection, the high voltage standard device 3
For output end by the first signaling interface described in cable connection, the output end of the voltage transformer 4 passes through described in cable connection the
Binary signal interface.
As further preferred embodiment, the relay protection device further includes being connected with the voltage transformer 4
The output end of the remote digital module 9 connect, the remote digital module 9 connects the transformer transient tester 5, so that
The transformer transient tester 5 can be applied to have the remote digital module 9 and without the remote digital module 9
Two kinds of situations.Moreover, in test, by the secondary of the secondary analog signal of the voltage transformer 4 and high voltage standard device 3
Analog signal directly sampled and compared can, and when voltage transformer 4 is connected with remote digital module 9, need
Remote digital module 9 and host 8 are connected by optical fiber, by carrying out waveform comparison again after data parsing and time delay equalization.
As shown in Figure 1, the high voltage direct current charge power supply 1, the direct current square-wave generator 2, the high voltage standard device 3 with
And the voltage transformer 4 is provided with ground terminal.
For the ease of the transformer transient tester 5 acquire data, the transformer transient tester 5 include with it is described
The isolation sampling that high voltage standard device 3 and the voltage transformer 4 are connected and communication unit 7 and with it is described be isolated sampling with
The host 8 that communication unit 7 is connected, the isolation sampling are connect with communication unit 7 with the host 8 by optical fiber.
As shown in figure 5, the invention also discloses a kind of transient test methods for high-voltage dc voltage mutual inductor, packet
Include following steps:
S1: the charging voltage of the high voltage direct current charge power supply 1 is set.
In the present invention, the high voltage direct current charge power supply 1 is used to charge to the direct current square-wave generator 2, and sets
The fixed charging voltage is U0。
S2: connecting the high voltage direct current charge power supply 1 and direct current square-wave generator 2, the opening of control relay switch component,
Disconnected state, so that the high voltage direct current charge power supply 1 charges to the direct current square-wave generator.
Specifically, step S2 are as follows: connect first relay switch 13, disconnect second relay switch 14, institute
Third relay switch 15 and each IGBT switch 12 are stated, the high voltage direct current charge power supply 1 will be to the direct current at this time
Square-wave generator 2 charges, and charging current flow through after the first diode 10 will for the storage capacitor 11 into
Row charged in parallel.The voltage that 1 output end of high voltage direct current charge power supply is observed during charging, until the high straightening
The voltage of current charge power supply 1 rises to U0And keep stable, illustrate charging complete, i.e., the voltage approximation of each storage capacitor 11 reaches
To U0。
S3: control the opening of relay switch component, disconnected state simultaneously turn on IGBT switch 12, so that the generation of direct current square wave
Device 2 discharges, and the voltage discharged is transferred to the high voltage standard device 3 and the voltage transformer 4.
Specifically, step S3 are as follows: connect second relay switch 14, disconnect first relay switch 13 and institute
Third relay switch 15 is stated, at this point, each IGBT switch 12 is in off-state；The transformer transient verification is set
Instrument 5 only needs to be arranged the high voltage standard device 3 and the electricity if the secondary output of the voltage transformer 4 is analog quantity
Press the secondary change of mutual inductor 4；If the output of voltage transformer 4 is digital quantity, the high pressure mark is not only set
The secondary change of quasi- device 3 and the voltage transformer 4, and there is provision of the inherent delay time of the voltage transformer 4；
Then the transformer transient tester 5 is controlled as triggering readiness, and trigger source is two in 3 channel of high voltage standard device
Secondary conversion voltage；Then, the IGBT switch 12 is connected, then each first diode 10, storage capacitor 11 and the second diode
16 will discharge after series connection, and the voltage discharged is transferred to the high voltage standard device 3 and the voltage transformer 4, i.e.,
The electric current discharged by the direct current square-wave generator 2 will by the high voltage standard device 3 and the voltage transformer 4, electric discharge
Duration is to control the time to bear test voltage in 10ms or so, high voltage standard device 3 and voltage transformer 4.
S4: the signal that the transformer transient tester 5 exports the high voltage standard device 3 and the voltage transformer 4
It is sampled and the signal after sampling is transmitted to the end PC 6.
Specifically, if the two times transfer output of the voltage transformer 4 is analog quantity, the isolation sampling and communication
Unit 7 is acquired the voltage in the voltage transformer 4 and 3 channel of high voltage standard device, once collected voltage
Size reaches triggering reserved value, then the isolation sampling is AD converted and stores to collected voltage with communication unit 7, together
When the data after conversion are transmitted to host 8.Since isolation sampling and communication unit 7 are High Speed Analog samplings, can recognize
It is the sampled signal of no time delay for it, and the remote digital module 9 is transmitted through the digital signal come and can generate during processing
One intrinsic delay, this is the inherent characteristic of voltage transformer 4, needs an accurately compensation, the delay data is by voltage
The producer of mutual inductor 4 provides.
In addition, as shown in figure 4, the calculation method of waveform result is: mutual to the high voltage standard device 3 and the voltage first
The data of sensor 4 are compared, when the voltage transformer 4 connects the remote digital module 9, for example, working as mutual induction of voltage
The intrinsic time delay of device 4 is 0.125ms, and the delay of the part is fallen in compensation, and the sample waveform of transient voltage can be with high voltage standard
The analog sampling wave of device 3 essentially coincides, which is issued by the end PC 6, and voltage transformer 4 does not need when directly connecing simulation output
Clock synchronization.
S5: the end PC 6 calculates received signal, stored and is shown.
Specifically, two-way test data is transferred to the end PC 6 by the transformer transient tester 5, then is calculated by the end PC 6
The main contents of measurement error, measurement error include rise time, peak value, instantaneous error, and wherein instantaneous error is two groups of samplings
The data error between all sampled points during the whole test process, the worst error value between two o'clock is exactly that maximum instantaneous is missed
Difference；National standard, which has the multinomial measurement error of voltage transformer 4, clearly to be limited, and 3 channel of high voltage standard device and mutual induction of voltage are compared
The data in 4 channel of device, so that it may which quantitative analysis is carried out to result.
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions each in flowchart and/or the block diagram
The combination of process and/or box in process and/or box and flowchart and/or the block diagram.It can provide these computer journeys
Sequence instruct to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices processor with
A machine is generated, so that the instruction generation executed by computer or the processor of other programmable data processing devices is used for
Realize the dress for the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram
It sets.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Claims (10)
1. a kind of relay protection device for high-voltage dc voltage mutual inductor, it is characterised in that: charge including high voltage direct current electric
Source, direct current square-wave generator, high voltage standard device, voltage transformer, transformer transient tester and the end PC, in which: the height
DC charging power supply is pressed to be used to charge to affiliated direct current square-wave generator, the direct current square-wave generator to what is received for filling
Piezoelectric voltage is upgraded and by the voltage transmission after upgrading to the high voltage standard device and the voltage transformer, the mutual inductance
After device transient state tester is used to that the signal that the high voltage standard device and the voltage transformer export to be sampled and will be sampled
Signal be transmitted to the end PC, the end PC is for calculating received signal, being stored and being shown.
2. relay protection device as described in claim 1, it is characterised in that: the direct current square-wave generator include several simultaneously
Join the charging and discharging unit of connection and the relay switch component for controlling the charging and discharging cell operation state, each
The charging and discharging unit includes storage capacitor, IGBT switch, first diode and the second diode, the first diode,
The storage capacitor and second diode are connect after being sequentially connected in series with the IGBT switch in parallel.
3. relay protection device as claimed in claim 2, it is characterised in that: the relay switch component includes being arranged in institute
It states the first relay switch of first diode input terminal, be arranged in the high voltage standard device and the voltage transformer output end
The second relay switch and the third relay switch for being grounded small resistance output end is set.
4. relay protection device as described in claim 1, it is characterised in that: the transformer transient tester includes to be used for
Connect the first signaling interface of the high voltage standard device and the second signal interface for connecting the voltage transformer.
5. relay protection device as described in claim 1, it is characterised in that: the relay protection device further includes and the electricity
The remote digital module that pressure mutual inductor is connected, the output end of the remote digital module connect the transformer transient verification
Instrument.
6. relay protection device as described in claim 1, it is characterised in that: the high voltage direct current charge power supply, the direct current
Square-wave generator, the high voltage standard device and the voltage transformer are provided with ground terminal.
7. the relay protection device for High Level DC Voltage mutual inductor as described in claim 1-6 any one, feature exist
In: the transformer transient tester include be connected with the high voltage standard device and the voltage transformer be isolated sampling with
Communication unit and the host that is connected with communication unit of sampling is isolated with described, the isolation samples and communication unit and institute
Host is stated to connect by optical fiber.
8. a kind of transient test methods for high-voltage dc voltage mutual inductor, characterized by the following steps:
S1: control the opening of relay switch component, disconnected state, so that charging electricity of the high voltage direct current charge power supply using setting
Press to the direct current square-wave generator charging；
S2: after direct current square-wave generator charging complete, control the opening of relay switch component, disconnected state simultaneously turn on IGBT and open
It closes, so that direct current square-wave generator discharges, and the voltage discharged is transferred to the high voltage standard device and the voltage
Mutual inductor；
S3: the signal that the transformer transient tester exports the high voltage standard device and the voltage transformer is adopted
Signal after sampling is simultaneously transmitted to the end PC by sample；
S4: the end PC calculates received signal, stored and is shown.
9. being used for the transient test methods of high-voltage dc voltage mutual inductor as claimed in claim 7, it is characterised in that: step S1
Specifically: the first relay switch is connected, disconnects the second relay switch, third relay switch and each IGBT switch, then
The high voltage direct current charge power supply will charge to the direct current square-wave generator, and charging current flows through the described 1st
After pole pipe charged in parallel will be carried out for storage capacitor.
10. being used for the transient test methods of high-voltage dc voltage mutual inductor as claimed in claim 7, it is characterised in that: step
S2 specifically: connect the second relay switch, disconnect the first relay switch and third relay switch, each IGBT is connected and opens
It closes, then each first diode, storage capacitor and the second diode will discharge after series connection, and the voltage discharged is transmitted
To the high voltage standard device and the voltage transformer.
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| CN201910341179.XA CN110161446A (en) | 2019-04-25 | 2019-04-25 | Relay protection device for high-voltage dc voltage mutual inductor |
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| CN201910341179.XA CN110161446A (en) | 2019-04-25 | 2019-04-25 | Relay protection device for high-voltage dc voltage mutual inductor |
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| CN111025219A (en) * | 2019-11-29 | 2020-04-17 | 中国电力科学研究院有限公司 | Device and method for testing transient response of direct-current voltage transformer |
| CN111239666A (en) * | 2020-02-07 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Transient characteristic test system of far-end module box |
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