CN116449162A - Simulation test device and monitoring method for turn-to-turn discharge defects of large power transformer - Google Patents
Simulation test device and monitoring method for turn-to-turn discharge defects of large power transformer Download PDFInfo
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- 238000004088 simulation Methods 0.000 title claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims abstract description 44
- 238000011161 development Methods 0.000 claims abstract description 15
- 239000011087 paperboard Substances 0.000 claims abstract description 14
- 239000004593 Epoxy Substances 0.000 claims abstract description 10
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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Abstract
The invention discloses a simulation test device and a monitoring method for turn-to-turn discharge defects of a large power transformer. The device comprises: the system comprises an equivalent discharge test model (1), an equivalent discharge loop (2) and a multi-parameter sensing monitoring system (3). The equivalent discharge test model (1) consists of an epoxy barrel (1-1), transformer oil (1-2), a column electrode (1-3), an oil immersed paperboard (1-4), a parallel electrode (1-5), an insulating rod (1-6), a voltage equalizing ball (1-7), a high-voltage guide rod (1-8) and a low-voltage guide rod (1-9); the equivalent discharging loop (2) consists of a 200kV booster (2-1), a protection resistor (2-2), a capacitor 1 (2-3), a capacitor 2 (2-4) and a 1:4 capacitor voltage divider (2-5); the multi-parameter sensing monitoring system (3) consists of a partial discharge detector (3-1), a high-frequency CT (3-2), an ultrasonic sensor (3-3) and an ultrahigh-frequency sensor (3-4). The invention can comprehensively diagnose the fault development degree of the turn-to-turn discharge.
Description
Technical Field
The invention belongs to the technical field of electrical equipment and measurement, and particularly relates to a simulation test device and a monitoring method for turn-to-turn discharge defects of a large power transformer.
Background
Power transformers are one of the key devices of a power system, and their health status is critical for safe and stable operation of the power system. The inter-turn discharge defect of the transformer is the most common fault type of the power transformer, and is characterized by high development speed and large insulation damage. The inter-turn discharge can reduce the insulation performance of the paperboard, generate dendritic creepage marks and even break down, and seriously threaten the safe operation of the transformer. Therefore, the method has important engineering significance in researching the development process of the inter-turn discharge defects, acquiring the discharge key characteristic quantity of the development process and acquiring the apparent discharge quantity of the inter-turn defects in the equivalent extra-high voltage transformer, so that faults are timely removed, and larger economic losses are avoided. The existing design of the inter-turn discharge defect model in the laboratory does not consider the capacitance distribution of a discharge loop, so that the discharge environment of an equivalent model is completely different from that of an actual transformer, and the apparent discharge quantity measured by the model is larger than the apparent discharge quantity difference measured when the actual transformer has inter-turn faults; meanwhile, the breakdown voltage of the paper board is usually about tens of kV, and cannot be equivalent to the working voltage of the transformer under the actual working condition, so that the externally applied voltage level of the paper board is inconsistent; defect development process research is usually analyzed according to statistical results obtained by a single measurement means, but research methods based on a single physical signal cannot meet actual requirements. Therefore, the existing small model research cannot accurately reflect the development process and characteristic quantity change rule under the creeping discharge fault, and the measured value is greatly different from the actual value under the creeping discharge fault of the actual transformer.
Object of the Invention
The invention aims to solve the problems in the prior art, provides a simulation test device and a monitoring method for the turn-to-turn discharge defect of a large power transformer, and can accurately reduce the actual operation condition of the large power transformer, so that the development process and the change rule of characteristic quantity when the turn-to-turn discharge occurs in the large power transformer can be mastered better, the defect of experimental results under the existing equivalent model can be made up, and new solution ideas and technical means can be provided for variable monitoring, rule deduction and model establishment of the turn-to-turn discharge fault of the large power transformer, and effective criteria can be provided for the protection of the large power transformer.
Disclosure of Invention
According to one aspect of the present invention, there is provided a simulation test apparatus for a turn-to-turn discharge defect of a large power transformer, comprising: the system comprises an equivalent discharge test model (1), an equivalent discharge loop (2) and a multi-parameter sensing monitoring system (3); the equivalent discharge test model (1) consists of an epoxy barrel (1-1), transformer oil (1-2), a column electrode (1-3), an oil immersed paperboard (1-4), a parallel electrode (1-5), an insulating rod (1-6), a voltage equalizing ball (1-7), a high-voltage guide rod (1-8) and a low-voltage guide rod (1-9); the equivalent discharge loop (2) consists of a 200kV booster (2-1), a protection resistor (2-2), a first capacitor (2-3), a second capacitor (2-4) and a 1:4 capacitor voltage divider (2-5); the multi-parameter sensing monitoring system (3) consists of a partial discharge detector (3-1), a high-frequency CT (3-2), an ultrasonic sensor (3-3) and an ultrahigh-frequency sensor (3-4).
Preferably, the apparent discharge amount measured by the partial discharge detector (3-1) is expressed as shown in formula (1):
△q s ＝△U·[C m +C g ·C b /(C g +C b )] (1)，
in the formula (1), deltaU is the variation of the externally applied voltage during discharge, C m Insulating capacitance of defect-free portion of sample, C g Capacitance of defective portion, C b To connect in series with the defect a partial dielectric capacitance, wherein C m Greater than C g And is far greater than C b 。
Preferably, the plate electrode (1-5) has a capacitance to ground of 4.4pF when the plate electrode (1-5) is 700mm from the bottom ground layer through the insulating rod (1-6).
Preferably, the high-voltage end parallel capacitor 1 (2-3) of the external circuit of the equivalent discharge test model (1) and the ground capacitor of the model are equivalent to the ground capacitor of the high-voltage winding; the capacitor 2 (2-4) is equivalent to a high-voltage sleeve capacitor, and the size of the capacitor is consistent with that of the high-voltage sleeve capacitor.
Preferably, the effective value of the discharge initial voltage of the turn-to-turn defect model consisting of the column electrode (1-3), the oil immersed paper board (1-4) and the parallel electrode (1-5) is 17kV, the effective value of the breakdown voltage is 60kV, and the impedance ratio of a high-voltage arm to a low-voltage arm of the capacitive voltage divider is 1:4; the column electrodes (1-3) are connected with the 1:4 capacitive voltage divider (2-5) through the upper ends of the high-voltage guide rods (1-8), the parallel electrodes (1-5) are connected with the middle ends of the 1:4 capacitive voltage divider (2-5) through the low-voltage guide rods (1-9), and the lower ends of the 1:4 capacitive voltage divider (2-5) are connected with the ground potential.
Preferably, in the multi-parameter sensing monitoring system (3), an ultrahigh frequency sensor (3-3) and an ultrasonic sensor (3-4) are arranged on a shell of an epoxy barrel (1-1) and are connected to acquisition equipment of a main control room through a transmission line; the high-frequency CT sensor (3-2) adopts a Rogowski coil measuring method, the Rogowski coil is arranged on a ground line led out of the epoxy barrel (1-1), and the high-frequency CT sensor is also connected with the acquisition equipment through a transmission line; the input end of the impedance box of the pulse current sensor-partial discharge detector (3-1) is connected with the capacitor core of the capacitor 2 (2-4), and the output end is connected with the detector through a transmission line.
According to another aspect of the present invention, there is provided a method for monitoring an inter-turn discharge defect of a power transformer using the above-mentioned simulation test apparatus, comprising the steps of:
step 1, applying the equivalent discharge model (1), compensating capacitance difference caused by electrode distance of the test device and inter-electrode distance difference of the large power transformer through simulation calculation, and ensuring that apparent discharge quantity of the defect model and an actual transformer is completely equivalent;
step 2, enabling the defect external discharge loop to be consistent with the actual transformer environment through a first capacitor (2-3) and a second capacitor (2-4) in the equivalent defect external discharge loop (2); the external voltage level of the discharge loop in the test device is ensured to be consistent with that of the real transformer through a 1:4 capacitive voltage divider (2-5), so that the operation working condition of the actual transformer in turn-to-turn discharge fault is equivalent;
and 3, applying the multi-parameter sensing monitoring system (3), sensing and collecting multi-physical signals including voltage, current, acoustic signals and ultrahigh frequency signals in the inter-turn discharge process to obtain a change rule of characteristic quantity in the defect discharge development process, and extracting the association relation between the defect severity and the characteristic quantity change of the multi-physical signals, so that the inter-turn discharge defect of the large-scale power transformer is monitored.
Drawings
Fig. 1 is a schematic diagram of a test apparatus for simulating turn-to-turn discharge defects of a large power transformer.
FIG. 2 is a schematic diagram of a multi-parameter sensor arrangement in connection with a discharge circuit.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be appreciated by those skilled in the art that the step numbers used herein are for convenience of description only and are not limiting as to the order in which the steps are performed. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. The term "and/or" refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Fig. 1 is a schematic diagram of an equivalent discharge test model simulating a turn-to-turn discharge defect of a large power transformer. As shown in FIG. 1, the equivalent discharge test model (1) consists of an epoxy barrel (1-1), transformer oil (1-2), a column electrode (1-3), an oil immersed paperboard (1-4), a parallel electrode (1-5), an insulating rod (1-6), a voltage equalizing ball (1-7), a high-voltage guide rod (1-8) and a low-voltage guide rod (1-9).
Fig. 2 is a schematic diagram showing the connection between the multi-parameter sensor arrangement and the discharge circuit in the test device for simulating the turn-to-turn discharge defect of the large power transformer. As shown in the figure, the equivalent discharge loop (2) consists of a 200kV booster (2-1), a protection resistor (2-2), a capacitor 1 (2-3), a capacitor 2 (2-4) and a 1:4 capacitor voltage divider (2-5); the multi-parameter sensing monitoring system (3) consists of a partial discharge detector (3-1), a high-frequency CT (3-2), an ultrasonic sensor (3-3) and an ultrahigh-frequency sensor (3-4).
The embodiment compensates the capacitance difference caused by the electrode distance of the test model and the electrode distance difference between the large power transformers, thereby avoiding the apparent discharge quantity difference between the model and the actual transformer caused by the inequivalence of the capacitance of the defective branch. The apparent discharge amount measured by the partial discharge instrument is as follows:
△q s ＝△U·[C m +C g ·C b /(C g +C b )] (1)，
in the above formula, deltaU is the variation of the applied voltage during discharge, C m Insulating capacitance of defect-free portion of sample, C g Capacitance of defective portion, C b To connect in series with the defect a partial dielectric capacitance, wherein C m Greater than C g And is far greater than C b . The electrode distance between the electrodes of the large power transformer is larger than that of the test model, so C b The invention can obtain the total capacitance of the defect part capacitance between two electrodes and the dielectric capacitance of the defect serial part in the actual transformer to be 3.45pF by multiple simulation of the actual transformer and the inter-turn discharge defect model, and the capacitance between the pillar plate electrodes in the model is15.93pF, so that the capacitance to ground of the plate electrodes (1-5) needs to be controlled to be 4.4pF according to the calculation result of the series-parallel connection of the capacitances. The ground capacitance of the plate electrode is adjusted by continuously adjusting the distance between the plate electrode (1-5) and the bottom grounding layer through simulation, when the plate electrode (1-5) is 700mm away from the bottom grounding layer through the insulating rod (1-6), the ground capacitance of the plate electrode (1-5) is 4.4pF, and the capacitance difference caused by the difference between the electrode distance of the test model and the electrode distance of the large power transformer is compensated, so that the difference between the apparent discharge quantity of the model and the apparent discharge quantity of the actual transformer caused by the inequality of the capacitance of the defect branch circuit is avoided.
The present embodiment considers the distribution of different capacitances in the actual transformer discharge loop, and the existence of these capacitances affects the defect evolution law. In the embodiment, different capacitances in a turn-to-turn discharge loop of a high-voltage winding of an actual transformer are equivalent, and the simulation result is obtained: the high-voltage end of the external circuit of the model is connected with a capacitor 1 (2-3) in parallel, and the capacitor of the model is equivalent to the capacitor of the high-voltage winding to the ground; the capacitor 2 (2-4) is equivalent to a high-voltage sleeve capacitor, and the size of the capacitor is consistent with that of the high-voltage sleeve capacitor. The capacitance distribution in the designed model is basically consistent with that of an actual transformer, so that the complete equivalence of an external circuit with discharge defects and the actual transformer is ensured.
The equivalent model of the equivalent discharge loop (2) simulates the high-potential discharge fault of the oil immersed paper board, and can ensure that the bearing voltages of the paper board under different externally applied voltages are kept consistent. The discharge initial voltage of the turn-to-turn defect model formed by the column electrodes (1-3), the oil immersed paper plates (1-4) and the parallel electrodes (1-5) is about 17kV (effective value), and the breakdown voltage is about 60kV (effective value), so that the impedance ratio of the high-voltage arm to the low-voltage arm of the capacitive voltage divider can be 1:4. The application of the 200kV booster (2-1) and the 1:4 capacitive voltage divider (2-5) enables the externally applied voltage to be equivalent to the actual working voltage of the large-scale transformer, so that the paperboard discharging process can be carried out under high potential, and the paperboard bearing voltages of different externally applied voltages are kept consistent through the 1:4 capacitive voltage divider (2-5). The column electrodes (1-3) are connected with the 1:4 capacitive voltage divider (2-5) through the upper ends of the high-voltage guide rods (1-8), the parallel electrodes (1-5) are connected with the middle ends of the 1:4 capacitive voltage divider (2-5) through the low-voltage guide rods (1-9), and the lower ends of the 1:4 capacitive voltage divider (2-5) are connected with the ground potential. The application of the protection resistor (2-2) prevents the damage of the system loop due to the breakdown current of the equipment with excessive high-potential discharge.
The multi-parameter sensing monitoring system (3) obtains the change rule of the characteristic quantity in the defect discharge development process through sensing and collecting multi-physical signals in the turn-to-turn discharge process, including voltage, current, acoustic signals and ultrahigh frequency signals, and extracts the association relation between the defect severity and the characteristic quantity change. The ultra-high frequency sensor (3-3) and the ultrasonic sensor (3-4) are arranged on the shell of the epoxy barrel (1-1) and are connected to the acquisition equipment of the main control room through a transmission line; the high-frequency CT sensor (3-2) adopts a Rogowski coil measuring method, the Rogowski coil is arranged on a ground line led out of the epoxy barrel (1-1), and the high-frequency CT sensor is also connected with the acquisition equipment through a transmission line; the input end of the impedance box of the pulse current sensor-partial discharge detector (3-1) is connected with the capacitor core of the capacitor 2 (2-4), and the output end is connected with the detector through a transmission line.
In summary, the invention provides the test model device for simulating the turn-to-turn discharge defect of the large power transformer, which accurately restores the operation condition of the large power transformer and completely equivalent to the internal turn-to-turn discharge fault of the actual transformer. The capacitance difference caused by the electrode distance of the test model and the electrode distance difference of the large power transformer is compensated through simulation calculation, so that the apparent discharge quantity of the defect model and the actual transformer is ensured to be completely equivalent; the defect external discharge loop is kept consistent with the actual transformer environment through the capacitance distribution in the equivalent defect external discharge loop; the design of the 1:4 capacitive voltage divider ensures that the external voltage level of the discharge loop is consistent with that of a real transformer, and the voltage born by the paper board under different external voltages can be kept unchanged, so that the operation working condition of the actual transformer during turn-to-turn discharge fault is equivalent; through sensing and collecting multiple physical signals in the turn-to-turn discharge process, including voltage, current, acoustic signals and ultrahigh frequency signals, the change rule of the characteristic quantity in the defect discharge development process is obtained, and the association relation between the defect severity and the characteristic quantity change is extracted.
The beneficial effects of the invention are as follows: the test device for simulating the turn-to-turn discharge defects of the large power transformer is designed, the capacitor distribution design is utilized to be more in line with the operation condition of the large power transformer, the discharge of the turn-to-turn discharge defects under the actual operation voltage of the transformer can be controlled, the voltage born by the oilpaper insulation structure under different externally applied voltages can be kept unchanged, and the comprehensive diagnosis of the fault development degree of the turn-to-turn discharge is carried out by combining the development rules of multiple physical signals in the turn-to-turn discharge process. The development process of the defect discharge can truly reduce the turn-to-turn discharge fault of the large power transformer, the change rule of each physical quantity in the discharge development process is highly equivalent to that of the large power transformer in actual fault, the collection of the characteristic quantity in the discharge process is more comprehensive and accurate, and experimental foundation and technical support are provided for the follow-up variable monitoring, rule deduction and model establishment of the turn-to-turn discharge fault of the large power transformer.
Claims (7)
1. The simulation test device for the turn-to-turn discharge defect of the large power transformer is characterized by comprising: the system comprises an equivalent discharge test model (1), an equivalent discharge loop (2) and a multi-parameter sensing monitoring system (3); the equivalent discharge test model (1) consists of an epoxy barrel (1-1), transformer oil (1-2), a column electrode (1-3), an oil immersed paperboard (1-4), a parallel electrode (1-5), an insulating rod (1-6), a voltage equalizing ball (1-7), a high-voltage guide rod (1-8) and a low-voltage guide rod (1-9); the equivalent discharge loop (2) consists of a 200kV booster (2-1), a protection resistor (2-2), a capacitor 1 (2-3), a capacitor 2 (2-4) and a 1:4 capacitor voltage divider (2-5); the multi-parameter sensing monitoring system (3) consists of a partial discharge detector (3-1), a high-frequency CT (3-2), an ultrasonic sensor (3-3) and an ultrahigh-frequency sensor (3-4).
2. The simulation test device for turn-to-turn discharge defects of a large power transformer according to claim 1, wherein the apparent discharge amount measured by the partial discharge detector (3-1) is represented as shown in formula (1):
△q s ＝△U·[C m +C g ·C b /(C g +C b )] (1)，
in the formula (1), deltaU is the variation of the external voltage during discharge,C m insulating capacitance of defect-free portion of sample, C g Capacitance of defective portion, C b To connect in series with the defect a partial dielectric capacitance, wherein C m Greater than C g And is far greater than C b 。
3. The simulation test device for turn-to-turn discharge defects of a large power transformer according to claim 1, wherein the capacitance to ground of the plate electrode (1-5) is 4.4pF when the plate electrode (1-5) is 700mm from the bottom ground layer through the insulating rod (1-6).
4. The simulation test device for the turn-to-turn discharge defect of the large power transformer according to claim 1 is characterized in that a high-voltage end parallel capacitor 1 (2-3) of an external circuit of an equivalent discharge test model (1) and a ground capacitor of the model are equivalent to a high-voltage winding ground capacitor together; the capacitor 2 (2-4) is equivalent to a high-voltage sleeve capacitor, and the size of the capacitor is consistent with that of the high-voltage sleeve capacitor.
5. The simulation test device for the turn-to-turn discharge defects of the large power transformer according to claim 1, wherein the effective value of the turn-to-turn defect model discharge initial voltage consisting of a column electrode (1-3), an oil immersed paperboard (1-4) and a parallel electrode (1-5) is 17kV, the effective value of breakdown voltage is 60kV, and the impedance ratio of a high-voltage arm to a low-voltage arm of the capacitive voltage divider is 1:4; the column electrodes (1-3) are connected with the 1:4 capacitive voltage divider (2-5) through the upper ends of the high-voltage guide rods (1-8), the parallel electrodes (1-5) are connected with the middle ends of the 1:4 capacitive voltage divider (2-5) through the low-voltage guide rods (1-9), and the lower ends of the 1:4 capacitive voltage divider (2-5) are connected with the ground potential.
6. The simulation test device for the turn-to-turn discharge defect of the large power transformer according to claim 1, wherein in the multi-parameter sensing monitoring system (3), an ultrahigh frequency sensor (3-3) and an ultrasonic sensor (3-4) are arranged on a shell of an epoxy barrel (1-1) and are connected to acquisition equipment of a main control room through a transmission line; the high-frequency CT sensor (3-2) adopts a Rogowski coil measuring method, the Rogowski coil is arranged on a ground line led out of the epoxy barrel (1-1), and the high-frequency CT sensor is also connected with the acquisition equipment through a transmission line; the input end of the impedance box of the pulse current sensor-partial discharge detector (3-1) is connected with the capacitor core of the capacitor 2 (2-4), and the output end is connected with the detector through a transmission line.
7. A method for monitoring inter-turn discharge defects of a power transformer using a simulation test apparatus for inter-turn discharge defects of a large power transformer as claimed in any one of claims 1 to 6, comprising the steps of:
step 1, applying the equivalent discharge model (1), compensating capacitance difference caused by electrode distance of the test device and inter-electrode distance difference of the large power transformer through simulation calculation, and ensuring that apparent discharge quantity of the defect model and an actual transformer is completely equivalent;
step 2, enabling the defect external discharge loop to be consistent with the actual transformer environment through a first capacitor (2-3) and a second capacitor (2-4) in the equivalent defect external discharge loop (2); the external voltage level of the discharge loop in the test device is ensured to be consistent with that of the real transformer through a 1:4 capacitive voltage divider (2-5), so that the operation working condition of the actual transformer in turn-to-turn discharge fault is equivalent;
and 3, applying the multi-parameter sensing monitoring system (3), sensing and collecting multi-physical signals including voltage, current, acoustic signals and ultrahigh frequency signals in the inter-turn discharge process to obtain a change rule of characteristic quantity in the defect discharge development process, and extracting the association relation between the defect severity and the characteristic quantity change of the multi-physical signals, so that the inter-turn discharge defect of the large-scale power transformer is monitored.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310586678.1A CN116449162A (en) | 2023-05-23 | 2023-05-23 | Simulation test device and monitoring method for turn-to-turn discharge defects of large power transformer |
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| CN202310586678.1A CN116449162A (en) | 2023-05-23 | 2023-05-23 | Simulation test device and monitoring method for turn-to-turn discharge defects of large power transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554856A (en) * | 2024-01-09 | 2024-02-13 | 国网山西省电力公司电力科学研究院 | Performance verification device and method for active defense equipment for turn-to-turn short circuit of transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554856A (en) * | 2024-01-09 | 2024-02-13 | 国网山西省电力公司电力科学研究院 | Performance verification device and method for active defense equipment for turn-to-turn short circuit of transformer |
| CN117554856B (en) * | 2024-01-09 | 2024-04-05 | 国网山西省电力公司电力科学研究院 | Performance verification device and method for active defense equipment for turn-to-turn short circuit of transformer |
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