CN204256110U - The proving installation measuring test is put for induced voltage drawn game time long - Google Patents
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- CN204256110U CN204256110U CN201420436671.8U CN201420436671U CN204256110U CN 204256110 U CN204256110 U CN 204256110U CN 201420436671 U CN201420436671 U CN 201420436671U CN 204256110 U CN204256110 U CN 204256110U
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Abstract
The utility model discloses and put for induced voltage drawn game time long the proving installation measuring test, it adopts sine wave to put exciting transformer without office without office's discharge source cooperation, put compensation reactor without office, put voltage divider without office, and other put measuring equipment without office, the principle according to parallel resonance completes test.Namely with no partial discharge frequency conversion power supply and tested transformer equivalent capacity and put in the parallel circuit of compensation reactor composition without office, the capacitive reactive power of tested transformer equals the lagging reactive power putting compensation reactor without office just, energy exchanges in tested transformer equivalent capacity and putting between compensation reactor without office, no partial discharge frequency conversion power supply does not need to provide reactive power to putting exciting transformer without office and putting compensation reactor without office, only needs the ohmic losses providing whole test loop.
Description
Technical field
The utility model relates to High-Voltage Technology and transformer field commissioning test technical field, in particular a kind of proving installation putting measurement test for induced voltage drawn game time long.
Background technology
At present, the pilot system of partial discharge of transformer is carried out at scene, main point intermediate frequency generator power-supply system and frequency conversion tuning power-supply system.Before frequency conversion tuning power supply is promoted, on-the-spot generally adopt be medium frequency electric generating unit as experiment power supply, and adopt the method for adequate compensation to test, its relative merits are comparatively outstanding.Run into when in use frequency generator group is tested some difficulty, mainly contain following some:
(1) starting current of intermediate frequency generator is very large, and usually can reach about 1000A, its power supply usually needs to become by the station of each transformer station.But the station of each transformer station change ruuning situation is not quite similar again, have plenty of separate unit and run, one is in stand-by state; Have plenty of two to run simultaneously, if need to use station change will relate to the application that has a power failure, also may involve the change of protection definite value simultaneously, handle unusual fluctuation formality, in the middle of need cost a large amount of time to coordinate, thus have influence on the whole test period.
(2) intermediate frequency generator is adopted to need to calculate comparatively accurately the reactive compensation capacity of test loop in advance; Trace it to its cause: medium frequency electric generating chance occurs self-excitation phenomenon, now generator meeting automatic boosting because of the reactive-load compensation deficiency of test loop, and voltage is uncontrollable and cause overvoltage, causes very large threat to the safety of tested transformer.Only run under inductive load, voltage could be steadily.Should not work under capacity load (needing to increase compensation rate).
(3) equipment set is heavy, bulky, generally needs two cars to be transported to site test.And noise is very large.Medium mill can only carry out the withstand voltage and local discharge test of transformer induction, can not do the withstand voltage of other electrical equipment and local discharge test.
In view of this, prior art has yet to be improved and developed.
Utility model content
The technical problems to be solved in the utility model is, for the above-mentioned defect of prior art, there is provided a kind of and put the proving installation measuring test for induced voltage drawn game time long, be intended to promote further on-the-spot long time induced voltage drawn game put the usability measuring test unit, to guarantee that easy, the efficient enforcement of on-the-spot large-scale local discharge test completes.
The technical scheme that the utility model technical solution problem adopts is as follows:
A kind of proving installation putting measurement test for induced voltage drawn game time long, wherein, comprise: control box, no partial discharge frequency conversion power supply, exciting transformer is put without office, compensation reactor is put without office, 200kV puts capacitive divider without office, 80kV puts capacitive divider without office, tester is put in office, tested transformer, the capacitance of bushing of tested transformer and impedance detection module, the signal input part of described no partial discharge frequency conversion power supply is by control box described in Fiber connection, the signal output part of described no partial discharge frequency conversion power supply is put tester by office and is connected impedance detection module, first output terminal and second output terminal of described no partial discharge frequency conversion power supply are connected described Same Name of Ends and the different name end of putting the armature winding of exciting transformer without office respectively, the described Same Name of Ends putting the secondary winding of exciting transformer without office by describedly putting compensation reactor ground connection without office, also put capacitive divider by described 200kV without office successively, 80kV is put capacitive divider ground connection without office, is also connected the input end of the low-voltage side coil of described tested transformer, described different name end ground connection of putting the secondary winding of exciting transformer without office, the output test lead of the high-pressure side coil of described tested transformer connects described impedance detection module by described capacitance of bushing,
The test mode of proving installation is: tested transformer is equivalent to an electric capacity, at no partial discharge frequency conversion power supply, put in the parallel circuit of low-voltage side coil composition of compensation reactor and tested transformer without office, the output frequency being changed no partial discharge frequency conversion power supply by control box makes whole test loop that parallel resonance occur, whole test loop is resistive in this case, and total current required in test loop reaches minimum value; Namely with no partial discharge frequency conversion power supply and tested transformer equivalent capacity and put in the parallel circuit of compensation reactor composition without office, the capacitive reactive power of tested transformer equals the lagging reactive power putting compensation reactor without office just, energy exchanges in tested transformer equivalent capacity and putting between compensation reactor without office, no partial discharge frequency conversion power supply does not need to provide reactive power to putting exciting transformer without office and putting compensation reactor without office, only needs the ohmic losses providing whole test loop.
Described puts for induced voltage drawn game time long the proving installation measuring test, wherein, described no partial discharge frequency conversion power supply comprises: frequency and Voltage Regulator Module, frequency, voltage, electric current indicating module, the first prime power amplifier module, the second prime power amplifier module, bridge-type power amplifier module, current rectifying and wave filtering circuit, quick overcurrent protection module, air cooling system and in advance combined floodgate and zero position protection module; First output terminal of described frequency and Voltage Regulator Module connects described frequency, voltage, electric current indicating module, for exporting frequency, voltage, the current parameters of no partial discharge frequency conversion power supply, and frequency, voltage, electric current indicating module is shown; The second output terminal that described frequency and Voltage Regulator Module connect puts tester by described first prime power amplifier module connection office, is also connected the first input end of described bridge-type power amplifier module by the first prime power amplifier module; Second input end of described bridge-type power amplifier module connects described air cooling system; the input/output terminal of bridge-type power amplifier module connects described current rectifying and wave filtering circuit; the output terminal of bridge-type power amplifier module connects the armature winding putting exciting transformer without office, and described current rectifying and wave filtering circuit also connects described quick overcurrent protection module and closes a floodgate in advance and zero position protection module.
Described puts for induced voltage drawn game time long the proving installation measuring test, wherein, describedly put exciting transformer without office and comprise: first puts exciting transformer and second without office puts exciting transformer without office, its rated capacity is 450kVA, nominal input voltage is: 2 × 350V/400V/420V, rated power is 50Hz, and specified working time is 90min.
Described put the proving installation measuring test for induced voltage drawn game time long, wherein, describedly put compensation reactor without office and comprise: the reactor of 1 110kV be connected in series and the reactor of 2 40kV.
Described put the proving installation measuring test for induced voltage drawn game time long, wherein, describedly put compensation reactor without office and comprise an insulator foot, described insulator foot is designed with forklift hole position.
A kind of proving installation putting measurement test for induced voltage drawn game time long provided by the utility model, sine wave is adopted to put exciting transformer without office without office's discharge source cooperation, put compensation reactor without office, put voltage divider without office, and other put measuring equipment without office, the principle according to parallel resonance completes test.Namely with no partial discharge frequency conversion power supply and tested transformer equivalent capacity and put in the parallel circuit of compensation reactor composition without office, the capacitive reactive power of tested transformer equals the lagging reactive power putting compensation reactor without office just, energy exchanges in tested transformer equivalent capacity and putting between compensation reactor without office, no partial discharge frequency conversion power supply does not need to provide reactive power to putting exciting transformer without office and putting compensation reactor without office, only needs the ohmic losses providing whole test loop.
Accompanying drawing explanation
The structural representation putting the proving installation measuring test for induced voltage drawn game time long that Fig. 1 provides for the utility model.
The principle of work process flow diagram putting no partial discharge frequency conversion power supply in the embodiment of the proving installation measuring test for induced voltage drawn game time long that Fig. 2 provides for the utility model.
What Fig. 3 provided for the utility model puts for induced voltage drawn game time long the schematic diagram putting compensation reactor in the embodiment of the proving installation measuring test without office.
Embodiment
The utility model provides a kind of and puts the proving installation measuring test for induced voltage drawn game time long, for making the purpose of this utility model, technical scheme and advantage clearly, clearly, referring to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Refer to Fig. 1, the schematic diagram putting the proving installation measuring test for induced voltage drawn game time long that Fig. 1 provides for the utility model, as shown in Figure 1, described for induced voltage drawn game time long put measure test proving installation comprise: control box 100, no partial discharge frequency conversion power supply 200 (representing by variable-frequency power sources in figure), exciting transformer 300 is put without office, compensation reactor 400 is put without office, 200kV puts capacitive divider 500 without office, 80kV puts capacitive divider 600 without office, tester 700 is put in office, tested transformer 800, the capacitance of bushing 810 of tested transformer and impedance detection module 900, the signal input part 210 of described no partial discharge frequency conversion power supply 200 is by control box 100 described in Fiber connection, the signal output part 220 of described no partial discharge frequency conversion power supply 200 is put tester 700 by office and is connected impedance detection module 900, first output terminal 230 and second output terminal 240 of described no partial discharge frequency conversion power supply 200 are connected described Same Name of Ends and the different name end of putting the armature winding of exciting transformer 300 without office respectively, the described Same Name of Ends putting the secondary winding of exciting transformer 300 without office by describedly putting compensation reactor 400 ground connection without office, also put capacitive divider 500 by described 200kV without office successively, 80kV is put capacitive divider 600 ground connection without office, is also connected the input end of the low-voltage side coil of described tested transformer 800, described different name end ground connection of putting the secondary winding of exciting transformer 300 without office, the output test lead of the high-pressure side coil of described tested transformer 800 connects described impedance detection module 900 by described capacitance of bushing 810.
The test mode of proving installation is: tested transformer is equivalent to an electric capacity, at no partial discharge frequency conversion power supply, put in the parallel circuit of low-voltage side coil composition of compensation reactor and tested transformer without office, the output frequency being changed no partial discharge frequency conversion power supply by control box makes whole test loop that parallel resonance occur, whole test loop is resistive in this case, and total current required in test loop reaches minimum value; Namely with no partial discharge frequency conversion power supply and tested transformer equivalent capacity and put in the parallel circuit of compensation reactor composition without office, the capacitive reactive power of tested transformer equals the lagging reactive power putting compensation reactor without office just, energy exchanges in tested transformer equivalent capacity and putting between compensation reactor without office, no partial discharge frequency conversion power supply does not need to provide reactive power to putting exciting transformer without office and putting compensation reactor without office, only needs the ohmic losses providing whole test loop.
Specifically, described no partial discharge frequency conversion power supply, as experiment power supply, only provides the ohmic losses of whole test loop.In the present embodiment, for sinusoidal wave without office's discharge source, its high-power output adopts the principle of amplifying step by step.From initial micropower signal source, through repeatedly amplifying, realizing high-power output, meeting test needs.Signal source produces standard sine wave signal with variable-frequency function generator carries out voltage-regulation through digital regulation resistance, and this process is also frequency adjustment in process of the test and voltage-regulation.Variable-frequency power sources output frequency is identical with the frequency of signal source, and the adjustment of frequency and voltage realizes in signal source part.The output of signal source directly promotes " prime power amplifier " has made preliminary power export, and this " prime power amplifier " exports and is divided into two-way, and wherein a road produces " synchro source " identical with test frequency, and supply measurement of partial discharge instrument uses; An other road is used for promoting " bridge-type power amplifier ".The major part of " bridge-type power amplifier " namely high-power generation, in process of the test, its thermal value is very large, need a forced air cooling but system dispel the heat.
In the present embodiment, as shown in Figure 2, described no partial discharge frequency conversion power supply comprises: frequency and Voltage Regulator Module, frequency, voltage, electric current indicating module, the first prime power amplifier module, the second prime power amplifier module, bridge-type power amplifier module, current rectifying and wave filtering circuit, quick overcurrent protection module, air cooling system and in advance combined floodgate and zero position protection module; First output terminal of described frequency and Voltage Regulator Module connects described frequency, voltage, electric current indicating module, for exporting frequency, voltage, the current parameters of no partial discharge frequency conversion power supply, and frequency, voltage, electric current indicating module is shown; The second output terminal that described frequency and Voltage Regulator Module connect puts tester by described first prime power amplifier module connection office, is also connected the first input end of described bridge-type power amplifier module by the first prime power amplifier module; Second input end of described bridge-type power amplifier module connects described air cooling system; the input/output terminal of bridge-type power amplifier module connects described current rectifying and wave filtering circuit; the output terminal of bridge-type power amplifier module connects the armature winding putting exciting transformer without office, and described current rectifying and wave filtering circuit also connects described quick overcurrent protection module and closes a floodgate in advance and zero position protection module.
The described Main Function putting exciting transformer without office is when Existing during Partial Discharge Test for Transformer or series resonance withstand voltage test, exciting transformer is exported and is raised to suitable voltage, add to tested step down side or reactor low-voltage side, and exciting transformer transformation ratio selection is suitable, make variable-frequency power sources output voltage close to 350V (now variable-frequency power sources utilization ratio is best) as far as possible.
Testing transformer technical parameter is selected, design (choose voltage and carried out research, consider UHV (ultra-high voltage) company all change of current time variant voltage grade, propose technical parameter require 1.7 times of exciting voltages).This time design exciting transformer major parameter is as follows:
| Title | Parameter |
| Quantity | 2 |
| Rated capacity | 450kVA |
| Nominal input voltage | 2×350V/400V/420V |
| Rated output voltage | 30kV, 220V, sectional uses 190kV |
| Rated frequency | 50Hz |
| Specified working time | 90min |
The rationality of design parameter is calculated below with two typical converter power transformer parameter pressurization magnitudes of voltage.
According to above-mentioned calculating, when carrying out 1.7 times of exciting voltage tests, variable-frequency power sources output voltage is close to load voltage value, put in measuring process in 1.5 times of offices, variable-frequency power sources output voltage is also at about 300V, variable-frequency power sources duty is best, and also higher to power supply utilization ratio, can reduce the capacity of required power supply.
The effect of described compensation reactor in transformer partial discharge pilot system compensates tested step down side entrance capacitance electric current, and make whole test loop be resistive, variable-frequency power sources only needs the ohmic losses meeting whole test loop.
This time design compensation reactor major parameter is as follows:
| Title | Parameter | Title | Parameter |
| Quantity | 2 | Quantity | 4 |
| Rated voltage | 110kV | Rated voltage | 40kV |
| Rated current | 20A | Rated current | 20A |
| Inductance value | 6.6H | Inductance value | 2.4H |
| Centre tap 1 | 110kV/20A/6H | Centre tap 1 | 40kV/20A/2H |
| Centre tap 2 | 40kV/20A/2.4H | Centre tap 2 | 20kV/20A/1.2H |
Such as carrying out low-pressure side is the DC converter that connects of star when becoming local discharge test, and single-ended pressurization, single-ended compensation, reactor can adopt 1 110kV, the mode of 2 40kV reactor series connection is carried out.
Reactor population parameter is 190kV/20A/11.4H.With under reactor rated frequency 130Hz calculate can with maximum load be:
C=1/ [(2 π f) 2L]=0.131uF (in formula: L=11.4H f=130Hz)
The capacity current that can compensate is calculated as follows:
I＝U×2πf×C＝20A(U：190kV，C：0.131uF，f＝130Hz)
In full size field test, the low pressure side inlet capacitance of DC converter transformer generally is several ten thousand pF.In this state, only need regulate variable-frequency power sources output frequency, output frequency is increased, and the effect reaching parallel resonance both can.
Suppose that the highest test frequency is 290Hz, now calculation of reactor can with maximum load be:
C=1/ [(2 π f) 2L]=0.026uF (in formula: L=11.4H f=290Hz)
The capacity current that can compensate is calculated as follows:
I＝U×2πf×C＝9A(U：190kV，C：0.026uF，f＝290Hz)
According to above-mentioned calculating and on-site actual situations, the larger test nargin that namely compensation reactor of configuration leaves, can meet again the compensation requirement under the different compensation way of different tested transformer.
When partial discharge test is carried out in the DC converter change to low-pressure side being corner connection, the symmetrical pressuring method of on-the-spot employing.When adopting the reactor of same parameter to carry out symmetrical compensation, because the deviation of equivalent capacity over the ground of a, b both sides sleeve pipe is comparatively large, can cause the situation of both sides pressurization Voltage unbalance, maximum deviation can reach about 10% ~ 15%.In order to solve the unbalanced problem of pressurization, a lot of associate organization have employed series connection in the compensation reactor of side and adjusts the mode of sense reactor to solve, by regulating the iron core air gap of sense reactor during test pressurization, change the inductance value adjusting sense reactor, reach asymmetry compensation by the mode changing inductance value, make a, b both sides pressurization balance of voltage.And the every platform of compensation reactor of this cover test unit design is all with the tap of 10% and 50% adjustment of inductance, the mode by the inductance value changing separate unit or multiple stage reactor carries out asymmetry compensation, reaches the pressurization balance of voltage.The mode of sense electric reactor compensation is adjusted in relative employing, and equipment cost is low, and regulative mode is flexible, easy and simple to handle.
Such as: in certain rig-site utilization, side adopts 6.6H+2.4H+2.4H=11.4H to compensate, and side adopts 6.6H+2.4H+1.2H=10.2H to compensate, and both sides pressurization voltage is basically identical, measurement result both sides pressurization voltage only deviation 3kV, is no more than 1% of magnitude of voltage of exerting pressure.
That, when testing equipment Assembling, DC converter becomes when actual motion with should be noted that, value side bushing is all in the valve Room, the valve Room need keep constant temperature, constant humidity, and wants the clean etc. of the maintaining valve Room, does not generally allow the lorry of type of internal combustion engine, fork truck enters in the valve Room in the valve Room.
Become testing ground at DC converter, most of change of current becomes and carries out local discharge test out of doors, pushes the valve Room again, but be not precluded within the valve Room possibility of carrying out change of current changed situation and putting after test.
Be transported in the valve Room easily and efficiently to enable equipment, and in the valve Room, reach the requirement not needing to lift and both can carry out testing, this cover test unit all devises appropriate distance to spike bottom variable-frequency power sources, exciting transformer, facilitates fork truck to fork transport.To epoxy cartridge type compensation reactor, as shown in Figure 3, insulator foot 410 devises forklift hole position 411 especially, facilitate fork truck to transport equally.
Certainly, when valve Room closed test, reactor does not need closed assembly of connecting yet, and by designing the insulator foot of proper height, insulated by insulator foot, direct series connection both can be tested.
Below by a specific embodiment come illustratively of the present utility model long time induced voltage drawn game put and measure test unit and how to work:
The rationality of checking design parameter is calculated with certain current conversion station one typical converter power transformer parameter pressurization magnitude of voltage.
According to above-mentioned calculating, when carrying out 1.5 times of exciting voltage tests, variable-frequency power sources output voltage is close to load voltage value.Put in measuring process in 1.3 times of offices, variable-frequency power sources output voltage is also at about 300V, and variable-frequency power sources duty is best, and also higher to power supply utilization ratio, can reduce the capacity of required power supply.According to site test results, become carry out monolateral pressuring method to the change of current, side adopts reactance 6.6H+2.4H+2.4H=11.4H to compensate, put in measuring process in 1.3 times of offices, frequency conversion tank actual output voltage 327V, output current 641A, output frequency 268.8Hz, power angle 7 °.Conform to result of calculation pressure effect.
In sum, what the utility model provided puts for induced voltage drawn game time long the proving installation measuring test, sine wave is adopted to put exciting transformer without office without office's discharge source cooperation, put compensation reactor without office, put voltage divider without office, and other put measuring equipment without office, the principle according to parallel resonance completes test.Namely with no partial discharge frequency conversion power supply and tested transformer equivalent capacity and put in the parallel circuit of compensation reactor composition without office, the capacitive reactive power of tested transformer equals the lagging reactive power putting compensation reactor without office just, energy exchanges in tested transformer equivalent capacity and putting between compensation reactor without office, no partial discharge frequency conversion power supply does not need to provide reactive power to putting exciting transformer without office and putting compensation reactor without office, only needs the ohmic losses providing whole test loop.
Should be understood that; application of the present utility model is not limited to above-mentioned citing; for those of ordinary skills, can be improved according to the above description or convert, all these improve and convert the protection domain that all should belong to the utility model claims.
Claims (5)
1. put the proving installation measuring test for induced voltage drawn game time long for one kind, it is characterized in that, comprise: control box, no partial discharge frequency conversion power supply, exciting transformer is put without office, compensation reactor is put without office, 200kV puts capacitive divider without office, 80kV puts capacitive divider without office, tester is put in office, tested transformer, the capacitance of bushing of tested transformer and impedance detection module, the signal input part of described no partial discharge frequency conversion power supply is by control box described in Fiber connection, the signal output part of described no partial discharge frequency conversion power supply is put tester by office and is connected impedance detection module, first output terminal and second output terminal of described no partial discharge frequency conversion power supply are connected described Same Name of Ends and the different name end of putting the armature winding of exciting transformer without office respectively, the described Same Name of Ends putting the secondary winding of exciting transformer without office by describedly putting compensation reactor ground connection without office, also put capacitive divider by described 200kV without office successively, 80kV is put capacitive divider ground connection without office, is also connected the input end of the low-voltage side coil of described tested transformer, described different name end ground connection of putting the secondary winding of exciting transformer without office, the output test lead of the high-pressure side coil of described tested transformer connects described impedance detection module by described capacitance of bushing.
2. the proving installation putting measurement test for induced voltage drawn game time long according to claim 1, it is characterized in that, described no partial discharge frequency conversion power supply comprises: frequency and Voltage Regulator Module, frequency, voltage, electric current indicating module, the first prime power amplifier module, the second prime power amplifier module, bridge-type power amplifier module, current rectifying and wave filtering circuit, quick overcurrent protection module, air cooling system and in advance combined floodgate and zero position protection module; First output terminal of described frequency and Voltage Regulator Module connects described frequency, voltage, electric current indicating module, for exporting frequency, voltage, the current parameters of no partial discharge frequency conversion power supply, and frequency, voltage, electric current indicating module is shown; The second output terminal that described frequency and Voltage Regulator Module connect puts tester by described first prime power amplifier module connection office, is also connected the first input end of described bridge-type power amplifier module by the first prime power amplifier module; Second input end of described bridge-type power amplifier module connects described air cooling system; the input/output terminal of bridge-type power amplifier module connects described current rectifying and wave filtering circuit; the output terminal of bridge-type power amplifier module connects the armature winding putting exciting transformer without office, and described current rectifying and wave filtering circuit also connects described quick overcurrent protection module and closes a floodgate in advance and zero position protection module.
3. the proving installation putting measurement test for induced voltage drawn game time long according to claim 1, it is characterized in that, describedly put exciting transformer without office and comprise: first puts exciting transformer and second without office puts exciting transformer without office, its rated capacity is 450kVA, nominal input voltage is: 2 × 350V/400V/420V, rated power is 50Hz, and specified working time is 90min.
4. according to claim 1ly put the proving installation measuring test for induced voltage drawn game time long, it is characterized in that, describedly put compensation reactor without office and comprise: the reactor of 1 110kV be connected in series and the reactor of 2 40kV.
5. according to claim 1ly put the proving installation measuring test for induced voltage drawn game time long, it is characterized in that, describedly put compensation reactor without office and comprise an insulator foot, described insulator foot, on be designed with forklift hole position.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872789A (en) * | 2015-12-14 | 2017-06-20 | 中国电力科学研究院 | A kind of harmonic loss measurement apparatus of converter power transformer |
| CN107783019A (en) * | 2017-11-21 | 2018-03-09 | 广东电网有限责任公司电力科学研究院 | Induced voltage test device when a kind of three-phase transformer is long |
| CN110398674A (en) * | 2019-08-30 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | A kind of extra-high voltage parallel reactance is pressure-resistant and local discharge test device |
-
2014
- 2014-08-04 CN CN201420436671.8U patent/CN204256110U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106872789A (en) * | 2015-12-14 | 2017-06-20 | 中国电力科学研究院 | A kind of harmonic loss measurement apparatus of converter power transformer |
| CN106872789B (en) * | 2015-12-14 | 2020-07-07 | 中国电力科学研究院 | Harmonic loss measuring device of converter transformer |
| CN107783019A (en) * | 2017-11-21 | 2018-03-09 | 广东电网有限责任公司电力科学研究院 | Induced voltage test device when a kind of three-phase transformer is long |
| CN110398674A (en) * | 2019-08-30 | 2019-11-01 | 国网山西省电力公司电力科学研究院 | A kind of extra-high voltage parallel reactance is pressure-resistant and local discharge test device |
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