CN117192307A - Assessment method for risk state of insulating layer of dry distribution transformer in cold-hot alternating environment - Google Patents
Assessment method for risk state of insulating layer of dry distribution transformer in cold-hot alternating environment Download PDFInfo
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- CN117192307A CN117192307A CN202311177014.6A CN202311177014A CN117192307A CN 117192307 A CN117192307 A CN 117192307A CN 202311177014 A CN202311177014 A CN 202311177014A CN 117192307 A CN117192307 A CN 117192307A
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- 238000002474 experimental method Methods 0.000 claims abstract description 33
- 238000011156 evaluation Methods 0.000 claims abstract description 15
- 238000004088 simulation Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 25
- 238000012502 risk assessment Methods 0.000 claims description 17
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 230000001351 cycling effect Effects 0.000 claims description 2
- 238000009413 insulation Methods 0.000 description 3
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- 238000012544 monitoring process Methods 0.000 description 1
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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
- G01R31/1263—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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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
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2617—Measuring dielectric properties, e.g. constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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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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- Testing Relating To Insulation (AREA)
Abstract
The invention discloses an evaluation method of a risk state of an insulating layer of a dry-type distribution transformer in a cold-hot alternating environment, which comprises the following steps: firstly, a risk state evaluation experiment platform of a dry-type distribution transformer insulating layer is built, working voltage, temperature and humidity of the transformer winding insulating layer under rated operation are obtained according to the experiment platform, then dielectric loss tangent value, dielectric constant, partial discharge capacity, partial discharge times, winding insulating layer temperature and current flowing through a winding during operation of the dry-type distribution transformer winding insulating layer are measured according to simulation experiments to obtain a risk tolerance factor of the transformer winding insulating layer, and further the risk tolerance factor obtained through three experiments is calculated to obtain a risk evaluation coefficient of the dry-type distribution transformer winding insulating layer, and finally the risk state of the insulating layer is evaluated. According to the invention, the risk state of the insulating layer of the dry-type distribution transformer in the cold-hot alternating environment can be accurately estimated according to the actual running condition, and a basis is provided for the selection and estimation of the insulating layer of the dry-type distribution transformer in the cold-hot alternating environment.
Description
Technical Field
The invention belongs to the field of performance monitoring and fault diagnosis of electrical equipment, and particularly relates to an evaluation method of a risk state of an insulating layer of a dry-type distribution transformer in a cold-hot alternating environment.
Technical Field
The distribution network is a part with a wide point and multiple sides in the power grid, and the final end of the distribution network is directly connected with a user to directly reflect the requirements of the user on the aspects of power supply capacity, power quality, power supply reliability and the like of the power grid. The transformer is a vital power device in a power system, the distribution transformer is one of the most core power devices in the whole power distribution network, the primary side of the distribution transformer is connected with a high-voltage power network, the secondary side of the distribution transformer directly supplies power to users, the distribution transformer is numerous and widely distributed, so that the safety and stability of the distribution transformer directly influence the reliability of power utilization of the power users, once the distribution transformer has a problem, the power supply is interrupted, the normal work and life of the power users are directly influenced, even accidents are caused, and the personal and property safety of the power users is threatened. The traditional oil immersed type distribution transformer has a certain fire hazard, the dry type distribution transformer cast by the silicon rubber is already in trial operation in a part of regions, the distribution transformer can meet the condition of alternating change of ambient temperature during working, the alternating environment can have a certain influence on a winding insulating layer, but a simpler and more convenient and accurate assessment method is not available at present for assessing the risk state of the winding insulating layer of the dry type distribution transformer under the cold and hot alternating environment. In view of the safe operation of dry distribution transformers, it is important to discuss evaluating the risk status of the dry distribution transformer winding insulation in alternating cold and hot environments. Therefore, a method for evaluating the risk state of the insulating layer of the dry-type distribution transformer in a cold-hot alternating environment is urgently needed.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide an evaluation method for the risk state of the insulating layer of the dry-type distribution transformer in a cold-hot alternating environment, which can well evaluate the risk state of the insulating layer of the winding of the dry-type distribution transformer.
The technical scheme for realizing the invention is as follows:
the first step: building risk state evaluation experiment platform for insulating layer of dry distribution transformer
The dry-type distribution transformer insulating layer risk state evaluation experiment platform includes: terminal control equipment (1), power generating device (2), alternating current meter (3), upside dielectric loss tester (4), downside dielectric loss tester (5), left front side partial discharge tester (6), right front side partial discharge tester (7), left rear side partial discharge tester (8), right rear side partial discharge tester (9), earth protection (10), switch (11), temperature controller (12), outside temperature sensor (13), left side insulating layer temperature sensor (14), right side insulating layer temperature sensor (15), transformer test winding insulating layer (16), input wire (17), output wire (18), humidity controller (19), humidity transducer (20), experimental space (21), wherein:
the terminal control equipment (1) is directly connected with the power supply generating device (2), the temperature controller (12) and the humidity controller (19), and in order to reduce experimental errors, the humidity of the environment is controlled by the humidity controller (19) before each experiment, and the humidity of the environment is measured by the humidity sensor (20). The terminal control device (1) adjusts the voltage input to the transformer test winding insulating layer (16) by controlling the power supply generating device (2), thereby simulating an experiment and performing a partial discharge experiment. The simulation experiment is carried out in an experiment space (21), an effective value of passing winding current is measured by an alternating current meter (3), and physical quantities such as an upper dielectric loss tester (4), a lower dielectric loss tester (5), a left front partial discharge tester (6), a right front partial discharge tester (7), a left rear partial discharge tester (8), a right rear partial discharge tester (9), a left insulating layer temperature sensor (14) and a right insulating layer temperature sensor (15) of a transformer winding insulating layer are placed around a transformer testing winding insulating layer (16) and are respectively used for measuring physical quantities such as dielectric loss tangent value, dielectric constant, partial discharge quantity, partial discharge times and winding insulating layer temperature of the transformer winding insulating layer under a cold and hot alternating environment of the transformer testing winding insulating layer (16). Finally substituting the obtained data into a calculation formula to obtain a risk assessment coefficient;
and a second step of: obtaining operation parameters of a transformer winding according to an experimental platform
The rated voltage of the insulating layer (16) of the test winding of the dry distribution transformer is U n The unit is V; operating temperature T under rated operating conditions n The unit is K; firstly, a humidity controller (19) is controlled by a terminal control device (1) to adjust the humidity in an experimental space (21) to RH and keep constant, wherein the unit is Rh; known rated operating temperature T n Firstly, rated voltage U is introduced into a transformer test winding insulating layer (16) through a power supply generating device (2) n Then the temperature controller (12) is controlled by the terminal control device (1) to adjust the experimental temperature, and firstly the space temperature is adjusted to 1.05T n Holding for 3h, and adjusting the temperature to 0.95T n Hold for 3h and then adjust the temperature to T n Circulation ofThis step 3 is completed by cold and hot alternating experiments. Recovery of the experimental temperature to T n After holding for 3min, measuring the dielectric loss tangent value Tg of the insulating layer (16) of the transformer winding by an upper dielectric loss tester (4) and a lower dielectric loss tester (5) 1 、Tg 2 And a dielectric constant epsilon 1 、ε 2 The method comprises the steps of carrying out a first treatment on the surface of the Measuring an effective current value I passing through a transformer winding insulating layer (16) through an alternating current ammeter (3), wherein the unit is A; the actual temperature T of the insulating layer (16) of the transformer winding is measured by a left insulating layer temperature sensor (14) and a right insulating layer temperature sensor (15) 1 、T 2 The unit is K; then the switch (11) is closed to ensure the safety of the connection and grounding protection (10) of the insulating layer (16) of the transformer test winding, and the partial discharge experimental voltage is set as U m The unit is V; firstly, a power supply generating device (2) is used for supplying voltage to a transformer test winding insulating layer (16)Lasting for 5min, and increasing the voltage to U m And hold for 5s and then drop to +.>Keeping for 30min, and recording discharge amount Q every 3min i (i is total discharge times), the maximum discharge amount is Q max The unit is pC; after discharging, the data are recorded, the power supply can be disconnected, and the experiment is finished once; the experimental temperature was then adjusted to 1.1T n 、0.9T n And 1.2T n 、0.8T n After repeating the experiment twice, the evaluation is finished;
and a third step of: calculating risk tolerance factors
Dielectric loss tangent Tg based on experimental data measured in the second step 1 、Tg 2 Dielectric constant epsilon 1 、ε 2 Discharge quantity Q i (i is the total number of discharges), maximum discharge amount Q max Actual temperature T of the insulating layer (16) of the transformer winding 1 、T 2 And the effective current value I, and then calculating the risk tolerance factor D through a formula (1) j (j=1, 2, 3) is:
fourth step: acquiring risk assessment coefficient of insulating layer
Three experiments in total measure D 1 、D 2 、D 3 Then, calculating a risk assessment coefficient lambda of the insulating layer of the transformer winding according to a formula (2), wherein the risk assessment coefficient lambda is as follows:
fifth step: assessing risk status of insulation layers of transformer windings
According to the risk assessment coefficient lambda of the insulating layer of the transformer winding calculated in the fourth step, the risk state of the insulating layer of the dry-type distribution transformer can be assessed, if lambda is less than or equal to 0.92, the risk state of the insulating layer of the transformer is good, and safe operation can be continued; if lambda is more than 0.92, the risk state danger of the insulating layer of the transformer is indicated, and the distribution transformer should be overhauled in time.
The method for evaluating the risk state of the insulating layer of the dry-type distribution transformer in the cold-hot alternating environment has the advantages that: the method can accurately calculate the risk assessment coefficient of the transformer winding insulating layer, and provides an effective way for assessing the risk state of the dry distribution transformer winding insulating layer.
Drawings
Fig. 1 shows an evaluation test platform for risk status of insulating layers of a dry-type distribution transformer in a cold-hot alternating environment.
Fig. 2 shows a flow chart for evaluating the risk state of the insulating layer of the dry-type distribution transformer in a cold-hot alternating environment.
Detailed Description
The invention will be further described with reference to the drawings and detailed description. It should be emphasized that the specific embodiments described herein are merely illustrative of the present invention and are not limiting on the scope of the inventive concept and the claims.
The first step: building risk state evaluation experiment platform for insulating layer of dry distribution transformer
The dry-type distribution transformer insulating layer risk state evaluation experiment platform includes: terminal control equipment (1), power generating device (2), alternating current meter (3), upside dielectric loss tester (4), downside dielectric loss tester (5), left front side partial discharge tester (6), right front side partial discharge tester (7), left rear side partial discharge tester (8), right rear side partial discharge tester (9), earth protection (10), switch (11), temperature controller (12), outside temperature sensor (13), left side insulating layer temperature sensor (14), right side insulating layer temperature sensor (15), transformer test winding insulating layer (16), input wire (17), output wire (18), humidity controller (19), humidity transducer (20), experimental space (21), wherein:
the terminal control equipment (1) is directly connected with the power supply generating device (2), the temperature controller (12) and the humidity controller (19), and in order to reduce experimental errors, the humidity of the environment is controlled by the humidity controller (19) before each experiment, and the humidity of the environment is measured by the humidity sensor (20). The terminal control device (1) adjusts the voltage input to the transformer test winding insulating layer (16) by controlling the power supply generating device (2), thereby simulating an experiment and performing a partial discharge experiment. The simulation experiment is carried out in an experiment space (21), an effective value of passing winding current is measured by an alternating current meter (3), and physical quantities such as an upper dielectric loss tester (4), a lower dielectric loss tester (5), a left front partial discharge tester (6), a right front partial discharge tester (7), a left rear partial discharge tester (8), a right rear partial discharge tester (9), a left insulating layer temperature sensor (14) and a right insulating layer temperature sensor (15) of a transformer winding insulating layer are placed around a transformer testing winding insulating layer (16) and are respectively used for measuring physical quantities such as dielectric loss tangent value, dielectric constant, partial discharge quantity, partial discharge times and winding insulating layer temperature of the transformer winding insulating layer under a cold and hot alternating environment of the transformer testing winding insulating layer (16). Finally substituting the obtained data into a calculation formula to obtain a risk assessment coefficient;
and a second step of: obtaining operation parameters of a transformer winding according to an experimental platform
The rated voltage of the insulating layer (16) of the test winding of the dry distribution transformer is U n The value is 10kV; operating temperature T under rated operating conditions n Its value is 343.56K; firstly, a humidity controller (19) is controlled by a terminal control device (1) to adjust the humidity in an experimental space (21) to RH and keep constant, wherein the humidity is 65%; known rated operating temperature T n Firstly, rated voltage U is introduced into a transformer test winding insulating layer (16) through a power supply generating device (2) n Then the temperature controller (12) is controlled by the terminal control device (1) to adjust the experimental temperature, and firstly the space temperature is adjusted to 1.05T n Holding for 3h, and adjusting the temperature to 0.95T n Hold for 3h and then adjust the temperature to T n And (3) cycling the step to finish the cold-hot alternating experiment for 3 times. Recovery of the experimental temperature to T n After holding for 3min, measuring the dielectric loss tangent value Tg of the insulating layer (16) of the transformer winding by an upper dielectric loss tester (4) and a lower dielectric loss tester (5) 1 、Tg 2 And a dielectric constant epsilon 1 、ε 2 The method comprises the steps of carrying out a first treatment on the surface of the Measuring an effective current value I passing through a transformer winding insulating layer (16) through an alternating current ammeter (3), wherein the unit is A; the actual temperature T of the insulating layer (16) of the transformer winding is measured by a left insulating layer temperature sensor (14) and a right insulating layer temperature sensor (15) 1 、T 2 The unit is K; then the switch (11) is closed to ensure the safety of the connection and grounding protection (10) of the insulating layer (16) of the transformer test winding, and the partial discharge experimental voltage is set as U m The unit is V; firstly, a power supply generating device (2) is used for supplying voltage to a transformer test winding insulating layer (16)Lasting for 5min, and increasing the voltage to U m And hold for 5s and then drop to +.>Keeping for 30min, and recording discharge amount Q every 3min i (i is total discharge times), the maximum discharge amount is Q max The unit is pC; after discharging, the data are recorded, the power supply can be disconnected, and the experiment is finished once; the experimental temperature was then adjusted to 1.1T n 、0.9T n And 1.2T n 、0.8T n After repeating the experiment twice, the evaluation is finished;
and a third step of: calculating risk tolerance factors
Dielectric loss tangent Tg based on experimental data measured in the second step 1 、Tg 2 Dielectric constant epsilon 1 、ε 2 Discharge quantity Q i (i is the total number of discharges), maximum discharge amount Q max Actual temperature T of the insulating layer (16) of the transformer winding 1 、T 2 And the effective current value I, and then calculating the risk tolerance factor D through a formula (1) j (j=1, 2, 3) is:
fourth step: acquiring risk assessment coefficient of insulating layer
Three experiments in total measure D 1 、D 2 、D 3 Then, calculating a risk assessment coefficient lambda of the insulating layer of the transformer winding according to a formula (2), wherein the risk assessment coefficient lambda is as follows:
fifth step: assessing risk status of insulation layers of transformer windings
And (3) according to the risk assessment coefficient lambda of the insulating layer of the transformer winding calculated in the fourth step, the risk assessment coefficient lambda of the insulating layer of the transformer winding is 0.95, which indicates that the risk state of the insulating layer of the distribution transformer is good, and the distribution transformer can continue to operate safely.
Claims (1)
1. The method for evaluating the risk state of the insulating layer of the dry-type distribution transformer in the cold-hot alternating environment is characterized by comprising the following steps of:
the first step: building a risk state evaluation experiment platform for an insulating layer of the dry-type distribution transformer;
and a second step of: acquiring operation parameters of a transformer winding according to an experimental platform;
and a third step of: calculating a risk tolerance factor;
fourth step: acquiring an insulating layer risk assessment coefficient;
fifth step: evaluating the risk state of the insulating layer of the transformer winding;
the specific process of the first step is as follows:
the dry-type distribution transformer insulating layer risk state evaluation experiment platform includes: terminal control equipment (1), power generating device (2), alternating current meter (3), upside dielectric loss tester (4), downside dielectric loss tester (5), left front side partial discharge tester (6), right front side partial discharge tester (7), left rear side partial discharge tester (8), right rear side partial discharge tester (9), earth protection (10), switch (11), temperature controller (12), outside temperature sensor (13), left side insulating layer temperature sensor (14), right side insulating layer temperature sensor (15), transformer test winding insulating layer (16), input wire (17), output wire (18), humidity controller (19), humidity transducer (20), experimental space (21), wherein:
the terminal control equipment (1) is directly connected with the power supply generating device (2), the temperature controller (12) and the humidity controller (19), and in order to reduce experimental errors, the humidity of the environment is controlled by the humidity controller (19) before each experiment, and the humidity of the environment is measured by the humidity sensor (20). The terminal control device (1) adjusts the voltage input to the transformer test winding insulating layer (16) by controlling the power supply generating device (2), thereby simulating an experiment and performing a partial discharge experiment. The simulation experiment is carried out in an experiment space (21), an effective value of passing winding current is measured by an alternating current meter (3), and physical quantities such as an upper dielectric loss tester (4), a lower dielectric loss tester (5), a left front partial discharge tester (6), a right front partial discharge tester (7), a left rear partial discharge tester (8), a right rear partial discharge tester (9), a left insulating layer temperature sensor (14) and a right insulating layer temperature sensor (15) of a transformer winding insulating layer are placed around a transformer testing winding insulating layer (16) and are respectively used for measuring physical quantities such as dielectric loss tangent value, dielectric constant, partial discharge quantity, partial discharge times and winding insulating layer temperature of the transformer winding insulating layer under a cold and hot alternating environment of the transformer testing winding insulating layer (16). Finally substituting the obtained data into a calculation formula to obtain a risk assessment coefficient;
the specific process of the second step is as follows:
the rated voltage of the insulating layer (16) of the test winding of the dry distribution transformer is U n The unit is V; operating temperature T under rated operating conditions n The unit is K; firstly, a humidity controller (19) is controlled by a terminal control device (1) to adjust the humidity in an experimental space (21) to RH and keep constant, wherein the unit is Rh; known rated operating temperature T n Firstly, rated voltage U is introduced into a transformer test winding insulating layer (16) through a power supply generating device (2) n Then the temperature controller (12) is controlled by the terminal control device (1) to adjust the experimental temperature, and firstly the space temperature is adjusted to 1.05T n Holding for 3h, and adjusting the temperature to 0.95T n Hold for 3h and then adjust the temperature to T n And (3) cycling the step to finish the cold-hot alternating experiment for 3 times. Recovery of the experimental temperature to T n After holding for 3min, measuring the dielectric loss tangent value Tg of the insulating layer (16) of the transformer winding by an upper dielectric loss tester (4) and a lower dielectric loss tester (5) 1 、Tg 2 And a dielectric constant epsilon 1 、ε 2 The method comprises the steps of carrying out a first treatment on the surface of the Measuring an effective current value I passing through a transformer winding insulating layer (16) through an alternating current ammeter (3), wherein the unit is A; the actual temperature T of the insulating layer (16) of the transformer winding is measured by a left insulating layer temperature sensor (14) and a right insulating layer temperature sensor (15) 1 、T 2 The unit is K; then the switch (11) is closed to ensure the safety of the connection and grounding protection (10) of the insulating layer (16) of the transformer test winding, and the partial discharge experimental voltage is set as U m The unit is V; firstly, a power supply generating device (2) is used for supplying voltage to a transformer test winding insulating layer (16)Lasting for 5min, and increasing the voltage to U m And hold for 5s and then drop to +.>Keeping for 30min, and recording discharge amount Q every 3min i (i is total discharge times), the maximum discharge amount is Q max The unit is pC; after discharging, the data are recorded, the power supply can be disconnected, and the experiment is finished once; the experimental temperature was then adjusted to 1.1T n 、0.9T n And 1.2T n 、0.8T n After repeating the experiment twice, the evaluation is finished;
the specific process of the third step is as follows:
dielectric loss tangent Tg based on experimental data measured in the second step 1 、Tg 2 Dielectric constant epsilon 1 、ε 2 Discharge quantity Q i (i is the total number of discharges), maximum discharge amount Q max Actual temperature T of the insulating layer (16) of the transformer winding 1 、T 2 And the effective current value I, and then calculating the risk tolerance factor D through a formula (1) j (j=1, 2, 3) is:
the specific process of the fourth step is as follows:
three experiments in total measure D 1 、D 2 、D 3 Then, calculating a risk assessment coefficient lambda of the insulating layer of the transformer winding according to a formula (2), wherein the risk assessment coefficient lambda is as follows:
the specific process of the fifth step is as follows:
according to the risk assessment coefficient lambda of the insulating layer of the transformer winding calculated in the fourth step, the risk state of the insulating layer of the dry-type distribution transformer can be assessed, if lambda is less than or equal to 0.92, the risk state of the insulating layer of the transformer is good, and safe operation can be continued; if lambda is more than 0.92, the risk state danger of the insulating layer of the transformer is indicated, and the distribution transformer should be overhauled in time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311177014.6A CN117192307A (en) | 2023-09-13 | 2023-09-13 | Assessment method for risk state of insulating layer of dry distribution transformer in cold-hot alternating environment |
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| CN202311177014.6A CN117192307A (en) | 2023-09-13 | 2023-09-13 | Assessment method for risk state of insulating layer of dry distribution transformer in cold-hot alternating environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117558545A (en) * | 2024-01-11 | 2024-02-13 | 沈阳松陵三航机械制造有限公司 | Energy-saving dry-type transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117558545A (en) * | 2024-01-11 | 2024-02-13 | 沈阳松陵三航机械制造有限公司 | Energy-saving dry-type transformer |
| CN117558545B (en) * | 2024-01-11 | 2024-05-03 | 西安胜鑫电力有限公司 | Energy-saving dry-type transformer |
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