CN109406907A - High-impedance transformer simulates on-load through-flow test device and test method - Google Patents
High-impedance transformer simulates on-load through-flow test device and test method Download PDFInfo
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- CN109406907A CN109406907A CN201811499769.7A CN201811499769A CN109406907A CN 109406907 A CN109406907 A CN 109406907A CN 201811499769 A CN201811499769 A CN 201811499769A CN 109406907 A CN109406907 A CN 109406907A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/20—Measuring number of turns; Measuring transformation ratio or coupling factor of windings
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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Abstract
A kind of high-impedance transformer simulation on-load through-flow test device and test method, including electronic three-phase wideband power supply and three-phase high-current generator, wideband are without phase of line telemetering equipment；Electronic three-phase wideband power supply output end is connect with three-phase main-frequency high current current lifting device, and the current lifting device three-phase main-frequency high current is made of three consistent isolating transformers of specifications and models；Measurement first does time calibration wideband wireless telemetering phase device host and extension set before starting, and progress power frequency is through-flow, low frequency is through-flow, detects the correctness of differential protection hexagonal figure；No-load voltage ratio is measured, judge no-load voltage ratio, polar correctness and carries out difference stream operation；This invention ensures that the safe and stable operation of system, improves the success rate that once puts into operation.
Description
Technical field
The present invention relates to relay protection fields more particularly to a kind of high-impedance transformer to simulate on-load through-flow test device
And test method.
Background technique
2018 editions-State Grid Co., Ltd., the 18 great anti-accident measures of power grid (revised edition) relay protected operation pipes
Reason requires: all protection current loops are before putting into operation, except should meet current transformer precision and measurement in load current
It is correctly outer that no-load voltage ratio, polarity and electric current and voltage circuit phase relation are measured under conditions of meter precision, it is necessary to measure in each
The out-of-balance current (or voltage) of property line, to guarantee the correctness of protective device and second loop return wiring.
With the development of electric system, transformer individual capacity is increasing, self coupling more than 1000MVA/500kV voltage
Formula transformer (the boosting change including power plant, Qi Beibian) covers in addition since short-circuit impedance is higher (up to 100 ohm or more)
Pipe CT no-load voltage ratio is larger (4000/1).Existing three-phase through-flow test method majority can only be through-flow to bus bar circuit, logical to transformer
Stream substantially using stand in maintenance power box 380V directly power or pass through boosting mode (2kV) it is through-flow to high voltage side of transformer,
Several amperes may only be added in this way in transformer primary side current, and station interior power capacity limit can be often subject to
System, being reflected in CT secondary side current can only be to 0.5~2mA, since the highest of protective device display screen measurement secondary current is differentiated
Rate only has 10mA, can not read the secondary current value that the 380V voltage of power frequency application generates at all, be increased using boosting mode and tried
The safety and live operability when power supply capacity necessarily affects equipment application are tested, simulation load test differential protection band is given
Carry out very big inconvenience.Due to the reason of transformer impedance range wide (1.5~200), transformer belt load polarity test generally can only
It can be measured after transformer puts into operation, risk will certainly be brought to putting equipment in service in this way.
Summary of the invention
The present invention is that solve to apply when transformer impedance is excessively high to lead to power frequency through-flow test electric current less than normal, can not normally be measured
The problem of secondary loop current phase and amplitude, propose a kind of high-impedance transformer simulation on-load through-flow test experimental rig and
Test method can differentiate the protective device quadratic phase relationship for have strict demand to phase and protect the correctness in direction, pass through
High-precision frequency-selecting phase meter test transformer high and low pressure side CT secondary singal differentiates the pole of current loop in current differential protection
The correctness of sexual intercourse and no-load voltage ratio uses three phase low frequency power supply simulation load test transformer differential protection test method can be with
Decades of times reduces experiment power supply capacity, Measurement reliability height and accuracy.
The technical solution of the invention is as follows:
A kind of high-impedance transformer simulates on-load through-flow test device, including electronic three-phase wideband power supply and three-phase it is big
Current feedback circuit, wideband are without phase of line telemetering equipment；Electronic three-phase wideband power supply output end and three-phase main-frequency high current flow up
Device connection, the current lifting device three-phase main-frequency high current are made of three consistent isolating transformers of specifications and models.
Further, the wideband includes host and extension set without phase of line telemetering equipment, and host and extension set include letter simultaneously
Number acquisition module, signal amplification module, analog-to-digital conversion module, data processing module and wireless communication module, the host data
Processing module and extension set data processing module are respectively adopted the single-chip microcontroller with Floating-point Computation function and are respectively equipped with time calibration
Mouthful；Lubber-line, institute are equipped between host data processing module time calibration mouthful and extension set data processing module time calibration mouthful
State host data processing module output time reference pulse, the time that the extension set data processing module is issued by receiving host
The calibration of reference pulse deadline, realizes and synchronizes.
Further, the electronic three-phase wideband voltage source includes three-phase alternating current electrical input, hvdc circuit, H
Bridge circuit, pwm chip and sine of the third order filter circuit；
The alternating current is three-phase dynamic electricity source, and high voltage direct current, the hvdc circuit width are obtained after rectified filtering
Value is 565V, and the busbar voltage after rectifying and wave-filtering is added to the H bridge both ends of pwm chip driving, generates high frequency voltage, H bridge electricity
The high frequency voltage of road output exports required voltage through sine of the third order filter circuit；
DC inverter is the alternating current of some frequency or variable frequency by the H-bridge circuit by the folding of switch,
Switch is controlled by pwm chip；
The pwm chip is SPWM sinusoidal pulse width modulation chip；
The H-bridge circuit output end connect the host data processing module and extension set data with sine of the third order filter circuit
The mode that processing module is all made of DSP digital filtering handles sampled data, realizes frequency-selecting and the measurement of wideband.
A kind of high-impedance transformer simulation on-load through-flow test method, it is characterized in that:
Step 1: measurement first does time calibration to wideband wireless telemetering phase device host and extension set before starting, specific to grasp
Make mode are as follows:
1, lubber-line is inserted into host calibration mouth and used extension set calibration mouth respectively；
2, host setting is measured into interface in communication, extension set is set in electric current communication measurement interface；
3, system automatic Verification and make verification complete prompt；
4, lubber-line is pulled out, verification is completed, continues subsequent measurement；
Step 2: it requires to complete patching operations according to wiring；
Step 3: power frequency is through-flow
Bus interval three-phase circuit in three-phase high current current lifting device output end docking station, wideband is without phase of line telemetering equipment master
Machine selects any one phase CT secondary current as benchmark, extension set measurement interval circuit threephase switch CT secondary current phase and width
Value is sent to host；
Step 4: low frequency is through-flow
By step down side primary circuit by bus grounding switch short circuit, start electronic three-phase wideband power supply to change
The pressurization of depressor high-pressure side low frequency, and the cannula C T secondary loop current Adjustment Tests detected according to wideband wireless telemetering phase device
Frequency and output voltage make transformer high-low-voltage side cannula C T secondary current amplitude reach measuring accuracy requirement；
Extension set sends transformer high-low-voltage side cannula C T secondary current amplitude respectively and believes with the phase of host reference data
Breath detects the correctness of differential protection hexagonal figure to host；
Step 5: the phase and amplitude information sent according to extension set draws hexagonal relational graph, and measures no-load voltage ratio, judges to become
Than, polar correctness and carry out difference stream operation.
Further, the electronic three-phase wideband power supply and wideband use its low frequency part, institute without phase of line telemetering equipment
It states electronic three-phase wideband power supply output frequency and is respectively less than 5Hz with no phase of line telemetering equipment detection frequency.
Further, using low frequency to pass through transformer realizes simulation on-load through-flow test theoretical foundation for transformer short-circuit resistance
Anti- to be rendered as perception, impedance value and test frequency size are proportional.
Further, the 10% of rated current is less than to the electric current that transformer applies using electronic three-phase wideband power supply, root
According to automatically controlling after Selection experiment frequency, voltage magnitude output guarantees transformer core and cannula C T is not in low frequency saturation.
Further, the low-frequency current of primary circuit is made to reach 10A or more by adjusting experimental rig voltage in step 4,
Two side CT secondary current of bushing shell for transformer is more than 10mA.
A kind of high-impedance transformer a flow-through test method disclosed in this invention and testing equipment, can be in secondary guarantor
After protection unit current loop improves, carry out completing each winding current phase and current loop integrality when through-flow test before going into operation
Detection, a possibility that avoiding current phase mistake after equipment live, ensure that the safe and stable operation of system, improve one
The secondary success rate that puts into operation.Beneficial outcomes are as follows:
1, the power supply capacity of decades of times can be reduced using the present invention, and be convenient for onsite moving；
2, three-phase wideband power supply of the invention, three-phase high-current generator, wideband are without phase of line telemetering equipment using seperated
Structured Design further mitigates weight of equipment, improves live operability；
3, electronic three-phase wideband power supply, voltage output end need not increase isolating transformer by the way of the filtering of three ranks,
Greatly mitigate weight of equipment；
Wideband can track simultaneously measuring transformer high-low pressure cannula C T secondary current without phase of line telemetering equipment to test frequency
The amplitude of each phase with the phase relation of reference data and draws out the hexagonal figure of differential protection；Using wireless transmission, avoid introducing
Voltage reference dragging line causes security risk.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the restriction to the application for explaining the application.With reference to the accompanying drawing to the present invention
It is further elaborated.
Fig. 1 is electronic three-phase wideband voltage source structural schematic diagram；
Fig. 2 is wideband without phase of line telemetering equipment structural schematic diagram；
Fig. 3 is high-impedance transformer a flow-through test device wiring schematic diagram.
Specific embodiment
As shown in figure 3, high-impedance transformer simulation on-load through-flow test device of the invention, including electronic three-phase are wide
Frequency power, three-phase high-current generator and wideband are without phase of line telemetering equipment；
As shown in Figure 1, the electronic three-phase wideband voltage source is by three-phase alternating current electrical input, hvdc circuit, H bridge
Circuit, pwm chip and sine of the third order filter circuit composition.
The alternating current is three-phase dynamic electricity source, and high voltage direct current, the high voltage direct current amplitude are obtained after rectified filtering
For 565V, the busbar voltage after rectifying and wave-filtering is added to the H-bridge circuit both ends of pwm chip driving, generates high frequency voltage, H bridge
The high frequency voltage of circuit output exports required voltage through sine of the third order filter circuit.
The H-bridge circuit plays inversion because load or output end both end voltage that it can be made to connect or electric current are reversed herein
DC inverter is the alternating current of some frequency or variable frequency, is switched by PWM by the effect of device by the folding of switch
Control chip controls.
By pwm chip, specially SPWM SPWM Technique, SPWM passes through not equal to a series of width
Pulse is modulated, and comes equivalent sine waveform (amplitude, phase and frequency).Solves contact voltage regulator using such working method
The problem of carbon brush rapid wear, while electric drive switch has heat protection function, it being capable of the operation of long-time full load.
The high frequency voltage filtering mode that the electronic three-phase wideband voltage source is exported in the power tube output end of H-bridge circuit
For the filtering of three ranks, guarantee that the boundary on filter frequencies curve between passband and stopband is more precipitous, so that the selectivity of filter
It is higher, have output impedance low, the characteristics of filter effect, without increasing isolating transformer.It is exported after the filtering of wideband voltage source wide
Frequency electric voltage frequency is 0.5Hz-300Hz, output voltage 380V, output electric current 50A.
Electronic three-phase wideband power supply output end connects three-phase main-frequency high current current lifting device, and current lifting device is by three specifications and models
Consistent isolating transformer composition, input terminal and output end no-load voltage ratio are 20:1, and current lifting device port input voltage reaches 380V, current lifting device
Port output voltage reaches 200A close to 20V, single-phase output electric current, covers existing to the through-flow test of the power frequency of bus bar circuit.
The electric current that the present invention applies transformer using electronic three-phase wideband power supply less than rated current 10% hereinafter,
It can guarantee transformer core according to voltage magnitude output is automatically controlled after Selection experiment frequency and cannula C T is not in that low frequency is full
With.
The exportable 0.5Hz-300Hz three-phase of electronic three-phase wideband power supply 120 ° of symmetrical alternating current signal each other, output electricity
380V, output-current rating 50A are pressed, use can be met by the three-phase alternating current power supply in maintenance power box in substation and wanted
It asks；It is worked by the way of the filtering of three ranks, standard sine wave has output impedance low, the characteristics of good wave filtering effect, without increase
Isolating transformer carries out isolation filter；Using the high frequency switch mode work of SPWM control driving, this working method, which solves, to be connect
The carbon brush rapid wear problem of touch pressure regulator, electric drive switch itself and have heat protection function, can long-time operation at full load.
As shown in Fig. 2, the wideband includes host and extension set without phase of line telemetering equipment, host and extension set respectively include letter
Number acquisition module, signal amplification module, analog-to-digital conversion module, data processing module and wireless communication module, the host data
The single-chip microcontroller (STM32F4 series) with Floating-point Computation function is respectively adopted in processing module and extension set data processing module, and divides
It She You not time calibration mouthful；Between host data processing module time calibration mouthful and extension set data processing module time calibration mouthful
Equipped lubber-line, the host data processing module export time reference pulse, and the extension set data processing module passes through reception
The time reference pulse deadline calibration that host issues, hereafter can turn-off time base company's wiring, realize main, extension set time
It is synchronous.
By the way of wireless transmission, host selectes voltage or electric current is reference data, and main, extension set automatic tracing is applied
Voltage or electric current frequency, realize the measurement of low frequency signal phase and amplitude, host is subjected to extension set multiple groups measurement data, and
Color screen shows phase relation, that is, hexagonal figure.
The signal acquisition module includes the acquisition of voltage signal and the acquisition of current signal, and voltage signal passes through partial pressure side
Formula obtains voltage signal, and current signal is stuck in induction secondary current signal in CT secondary terminals sub-line by open type current clamp.
It is suitable that the signal amplification module is selected according to the anti-interference ability of signal and the voltage reference of analog-to-digital conversion module
Amplification factor and digital filtering processing is done to high-frequency signal.
Host data processing and extension set data processing module be all made of the mode of DSP digital filtering to sampled data into
Row processing, refers specifically to discrete sampled point carrying out discrete Fourier transform, converts frequency-region signal for time-domain signal, realizes choosing
The measurement of frequency and wideband.
The wireless communication module uses the semiduplex communication modes of low frequency 170MHz, can easily pass through wall, shielding etc.
Obstacle realizes Long-range Data Transmission.
The wideband without phase of line telemetering equipment host and extension set can automatic tracing voltage or electric current frequency, realize low frequency
The measurement of signal phase and amplitude.
The wideband is shown without phase of line telemetering equipment host using 7 cun of color screens, and multiple groups measurement data is subjected to and handles,
And hexagonal phase diagram is drawn according to measurement data.
Electronic three-phase wideband power supply output end connects high voltage side of transformer in field application, and wideband is filled without phase of line telemetering
It sets host current clamp and is stuck in high voltage side of transformer cannula C T bis- times with A phase reference data the most, the current clamp of extension set is stuck in
Step down side cannula C T bis- times three-phase is tested respectively.
The high-impedance transformer simulates on-load through-flow test method, and its step are as follows:
Step 1: measurement first does time calibration to wideband wireless telemetering phase device host and extension set before starting, specific to grasp
Make mode are as follows:
1, lubber-line is inserted into host calibration mouth and used extension set calibration mouth respectively；
2, host setting is measured into interface in communication, extension set is set in electric current communication measurement interface；
3, system automatic Verification and make verification complete prompt；
4, lubber-line is pulled out, verification is completed, continues subsequent measurement.
Step 2: it requires to complete patching operations as shown in Figure 2 according to wiring.
Step 3: power frequency is through-flow
Bus interval three-phase circuit in three-phase high current current lifting device output end docking station, wideband is without phase of line telemetering equipment master
Machine selects any one phase CT secondary current as benchmark, extension set measurement interval circuit threephase switch CT secondary current phase and width
Value is sent to host；
Step 4: low frequency is through-flow
By step down side primary circuit by bus grounding switch short circuit, start electronic three-phase wideband power supply to change
The pressurization of depressor high-pressure side low frequency, and the cannula C T secondary loop current Adjustment Tests detected according to wideband wireless telemetering phase device
Frequency and output voltage make transformer high-low-voltage side cannula C T secondary current amplitude reach measuring accuracy requirement；
Extension set sends transformer high-low-voltage side cannula C T secondary current amplitude respectively and believes with the phase of host reference data
Breath detects the correctness of differential protection hexagonal figure to host；
Step 5: the phase and amplitude information sent according to extension set draws hexagonal relational graph, and sets no-load voltage ratio, judges to become
Than, polar correctness and carry out difference stream operation.
Low frequency through-flow test foundation:
High-power transformer short-circuit impedance is in perception, it is assumed that its perceptual weight is n times of (n of resistive component under the conditions of power frequency
Value depends on transformer parameter, even tens times of reachable decades of times under the conditions of power frequency), according to impedance computation formulaAs f=50Hz, induction reactance X0=100 π L are n times of resistance, and impedance value is close to induction reactance at this time
Value.When f is low frequency m, induction reactance X1=2m π L, takes m=5Hz, and transformer impedance value reduces close to 10 times, with power frequency at this time
Test current of transformer increases 10 times under the threshold voltages such as 50Hz, and with the reduction of frequency, impedance reduces more obvious, note
Enter electric current linearly to increase.
The present invention is in perceptual characteristic using Transformer Short Circuit Impedance, through-flow using low-frequency power simulation on-load, mainly
Solve the problem of to apply when power frequency through-flow test that electric current is less than normal can not normally measure secondary loop current amplitude and phase.
This device opens standby change in Liaoning Datang world Huludao City 2 × 35MW of Power Co., Ltd. new construction 1#
Depressor differential protection wiring carries out the detection of hexagonal vectogram.The three phase mains of device sets 5Hz test frequency from 220kV
Line side (high voltage side of transformer) applies, the double entrance bus whole short circuit groundings of the side 6.3kV generator, so that test current passes through
Cross transformer and generate low frequency short circuit current in two side of low pressure, by each phase current magnitude of transformer high-low-voltage cannula C T second test and
Phase judges the wiring in transformer differential protection circuit by hexagonal vectogram and calculates difference stream.By low frequency measurement data with
The comparison of power frequency measurement data, demonstrates the correctness of low frequency three-phase through-flow theory.
The above is only specific embodiments of the present invention, are not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of high-impedance transformer simulates on-load through-flow test device, it is characterized in that: including electronic three-phase wideband power supply
With three-phase high-current generator, wideband without phase of line telemetering equipment；Electronic three-phase wideband power supply output end and three-phase main-frequency are big
The connection of electric current current lifting device, the current lifting device three-phase main-frequency high current are made of three consistent isolating transformers of specifications and models.
2. the high-impedance transformer according to claim 1 simulates on-load through-flow test device, it is characterized in that: the width
Frequency includes host and extension set without phase of line telemetering equipment, host and extension set respectively include signal acquisition module, signal amplification module,
Analog-to-digital conversion module, data processing module and wireless communication module, the host data processing module and extension set data processing mould
Block is respectively adopted the single-chip microcontroller with Floating-point Computation function and is respectively equipped with time calibration mouthful；In the host data processing module time
It calibrates and is equipped with lubber-line between mouth and extension set data processing module time calibration mouthful, the host data processing module exports the time
Reference pulse, the extension set data processing module are calibrated by the time reference pulse deadline that receiving host issues, are realized
It is synchronous.
3. high-impedance transformer according to claim 1 simulates on-load through-flow test device, it is characterized in that: the electronics
Formula three-phase wideband voltage source is by three-phase alternating current electrical input, hvdc circuit, H-bridge circuit, pwm chip and sine of the third order
Filter circuit composition；
The alternating current is three-phase dynamic electricity source, high voltage direct current is obtained after rectified filtering, the hvdc circuit amplitude is
565V, the busbar voltage after rectifying and wave-filtering are added to the H bridge both ends of pwm chip driving, generate high frequency voltage, and H-bridge circuit is defeated
High frequency voltage out exports required voltage through sine of the third order filter circuit；
DC inverter is the alternating current of some frequency or variable frequency, switch by the H-bridge circuit by the folding of switch
It is controlled by pwm chip；
The pwm chip is SPWM sinusoidal pulse width modulation chip；
The H-bridge circuit output end connect the host data processing and extension set data processing module with sine of the third order filter circuit
The mode for being all made of DSP digital filtering handles sampled data, realizes frequency-selecting and the measurement of wideband.
4. using the high-impedance transformer mould of high-impedance transformer as described in claim 1 simulation on-load through-flow test device
Quasi- on-load through-flow test method, it is characterized in that:
Step 1: measurement first does time calibration, concrete operations side to wideband wireless telemetering phase device host and extension set before starting
Formula are as follows:
1) lubber-line is inserted into host calibration mouth and used extension set calibration mouth respectively；
2) host setting is measured into interface in communication, extension set is set in electric current communication measurement interface；
3) system automatic Verification and make verification complete prompt；
4) lubber-line is pulled out, verification is completed, continues subsequent measurement；
Step 2: it requires to complete patching operations according to wiring；
Step 3: power frequency is through-flow
Bus interval three-phase circuit in three-phase high current current lifting device output end docking station, wideband are selected without phase of line telemetering equipment host
Any one phase CT secondary current is selected as benchmark, extension set measurement interval circuit threephase switch CT secondary current phase and amplitude are sent
To host；
Step 4: low frequency is through-flow
By step down side primary circuit by bus grounding switch short circuit, start electronic three-phase wideband power supply to transformer
The pressurization of high-pressure side low frequency, and the cannula C T secondary loop current Adjustment Tests frequency detected according to wideband wireless telemetering phase device
And output voltage, so that transformer high-low-voltage side cannula C T secondary current amplitude is reached measuring accuracy requirement；
Extension set send respectively transformer high-low-voltage side cannula C T secondary current amplitude and with the phase information of host reference data extremely
Host detects the correctness of differential protection hexagonal figure；
Step 5: the phase and amplitude information sent according to extension set draws hexagonal relational graph, and measures no-load voltage ratio, judges no-load voltage ratio, pole
Property correctness and carry out difference stream operation.
5. high-impedance transformer according to claim 4 simulates on-load through-flow test method, it is characterized in that: the electronics
Formula three-phase wideband power supply and wideband use its low frequency part, the electronic three-phase wideband power supply output without phase of line telemetering equipment
Frequency is respectively less than 5Hz with no phase of line telemetering equipment detection frequency.
6. high-impedance transformer according to claim 4 simulates on-load through-flow test method, it is characterized in that: using low frequency
It passes through transformer and realizes that simulation on-load through-flow test theoretical foundation is that Transformer Short Circuit Impedance is rendered as perception, impedance value and examination
It is proportional to test frequency size.
7. high-impedance transformer according to claim 4 simulates on-load through-flow test method, it is characterized in that: using electronics
The electric current that formula three-phase wideband power supply applies transformer is less than the 10% of rated current, according to automatically controlling after Selection experiment frequency
Voltage magnitude output guarantees transformer core and cannula C T is not in low frequency saturation.
8. high-impedance transformer according to claim 4 simulates on-load through-flow test method, it is characterized in that: in step 4
The low-frequency current of primary circuit is set to reach 10A or more, two side CT secondary current of bushing shell for transformer by adjusting experimental rig voltage
More than 10mA.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208373A (en) * | 2020-02-20 | 2020-05-29 | 中国电力科学研究院有限公司 | Mutual load method-based transformer rated operation condition simulation method and system |
| CN113030620A (en) * | 2021-03-16 | 2021-06-25 | 马鞍山钢铁股份有限公司 | Transformer differential protection phasor test system and method |
| CN114062875A (en) * | 2021-11-18 | 2022-02-18 | 株洲时代新材料科技股份有限公司 | Device and method for testing impedance characteristics of rail insulation and parts thereof |
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| CN113030620A (en) * | 2021-03-16 | 2021-06-25 | 马鞍山钢铁股份有限公司 | Transformer differential protection phasor test system and method |
| CN114062875A (en) * | 2021-11-18 | 2022-02-18 | 株洲时代新材料科技股份有限公司 | Device and method for testing impedance characteristics of rail insulation and parts thereof |
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