CN115754541A - Oil-immersed transformer bushing current-carrying capacity assessment method - Google Patents
Oil-immersed transformer bushing current-carrying capacity assessment method Download PDFInfo
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Abstract
The invention discloses a method for evaluating the current carrying capacity of a bushing of an oil-immersed transformer, which comprises the following steps: establishing an oil-immersed transformer bushing current-carrying capacity evaluation test platform, acquiring temperature data and insulation resistance data under different current load coefficients, and calculating the external surface heat dissipation coefficient K of the bushing under different current load coefficients s Calculating the temperature rise coefficient K in the sleeve under different current load coefficients i‑z 、K i‑w Calculating a sleeve current-carrying capacity evaluation factor K, and evaluating the oil-immersed transformer sleeve current-carrying capacity under different current load coefficients. The technical scheme of the invention has the advantages that: aiming at the over-current operation condition of the sleeve of the oil-immersed transformer, a brand new current-carrying capability assessment is providedThe method can accurately evaluate the current carrying capacity of the oil-immersed transformer bushing, and is beneficial to the optimal design of the oil-immersed transformer bushing.
Description
Technical Field
The invention relates to the field of electrical insulation online detection and fault diagnosis, in particular to a method for evaluating current carrying capacity of a bushing of an oil-immersed transformer.
Background
With the rapid development of domestic power grids, the voltage level and the capacity of the power grid are increased, a large number of transformers are put into operation every year to ensure the stable operation of a power system, and sleeves are used as key equipment for outgoing lines of the transformers and are mainly used for connecting the power transformers and buses of the power system, so that the safe and stable operation of the sleeves is directly related to the power transformers and even the power supply reliability of the power system.
For the transformer bushing, the largest effect is to carry current, a large amount of joule heat is generated in the operation process, the aging state of the insulation inside the bushing is directly influenced, the insulation failure may be caused by internal overheating, the possibility of insulation breakdown is greatly increased, and a major accident is caused, so that the current carrying capacity of the transformer bushing is directly influenced by temperature rise. The transformer is often subjected to overload operation conditions during service, which means that the current flowing through the bushing is higher than the rated current, which puts higher demands on the current carrying capacity of the transformer bushing. Due to the fact that the current-carrying capacity of the transformer bushing is subjected to wrong evaluation, the transformer bushing is operated under an over-current working condition beyond a bearing range, thermal faults inside the bushing are caused, the transformer is finally stopped, power supply reliability of a power system is seriously affected, and therefore a method capable of accurately evaluating the current-carrying capacity of the transformer bushing is urgently needed.
Disclosure of Invention
The invention provides a method for evaluating the current carrying capacity of a bushing of an oil-immersed transformer, which can accurately evaluate the current carrying capacity of the bushing of the oil-immersed transformer.
A method for evaluating the current carrying capacity of a bushing of an oil-immersed transformer comprises the following steps:
firstly, establishing an oil-immersed transformer bushing current-carrying capacity evaluation test platform
Oily formula transformer bushing overload capacity aassessment test platform includes: the device comprises a constant temperature test box (1), a test sleeve (2), epoxy impregnated paper (3), a sleeve sheath umbrella skirt (4), a central current-carrying conductor (5), a constant temperature oil tank (6), transformer oil (7), a middle layer temperature sensor array (8), an outer layer temperature sensor array (9), an umbrella skirt surface temperature sensor array (10), a sleeve bottom temperature sensor array (11), a transformer oil temperature monitoring sensor (12), an environmental temperature monitoring sensor (13), an insulation resistance tester (14), a grounding point (15), a data processing terminal (16) and an adjustable alternating current power supply (17);
the right side of the constant temperature test box (1) is provided with 3 environment temperature monitoring sensors (13) connected with a data processing terminal (16) for monitoring the internal temperature of the constant temperature test box (1) in real time; a middle-layer temperature sensor array (8) and an outer-layer temperature sensor array (9) which are connected with a data processing terminal (16) are arranged in the test sleeve (2) to respectively realize real-time monitoring of the surface temperature of the central current-carrying conductor (5) and the surface temperature of the epoxy impregnated paper (3), the number of sensors contained in the middle-layer temperature sensor array (8) and the outer-layer temperature sensor array (9) is M, and the sensors are sequentially marked as 1, 2, 3, 8230, M, M belongs to [1, M ]; an umbrella skirt surface temperature sensor array (10) connected with a data processing terminal (16) is arranged on the surface of a sleeve sheath umbrella skirt (4), so that the real-time monitoring of the surface temperature of the sleeve sheath umbrella skirt (4) is realized, the number of umbrella skirt pieces contained in the sleeve sheath umbrella skirt (4) is N, the number of sensors contained in the corresponding umbrella skirt surface temperature sensor array (10) is also N, and the sensors are marked as 1, 2, 3, \8230, N E [1, N ] in sequence from bottom to top; the constant-temperature oil tank (6) is filled with transformer oil (7), and in order to realize real-time monitoring of the temperature of the transformer oil (7), 3 transformer oil temperature monitoring sensors (12) connected with a data processing terminal (16) are installed in the constant-temperature oil tank (6); the bottom of a test casing (2) is immersed in transformer oil (7), a casing bottom temperature sensor array (11) connected with a data processing terminal (16) is installed at the bottom of the test casing (2), the casing bottom temperature sensor array (11) comprises H sensors, and the H sensors are sequentially marked as 1, 2, 3, 8230, H, e [1, H ]; one end of an insulation resistance tester (14) is connected with the central current-carrying conductor (5) of the test sleeve (2), and the other end of the insulation resistance tester is connected with the grounding point (15) and used for measuring the conductor-ground insulation resistance of the test sleeve (2); the adjustable alternating current power supply (17) is used for supplying power to the test sleeve (2), the insulation resistance tester (14) and the data processing terminal (16);
secondly, acquiring temperature data and insulation resistance data under different load coefficients
The temperature of the constant temperature test box (1) is set to be T A The unit is K, and when the temperature difference between every two of the 3 environment temperature monitoring sensors (13) is lower than 1K, the internal temperature of the constant temperature test box (1) is considered to be stable; the temperature of the constant-temperature oil tank (6) is set to be T B The unit is K, and when the temperature difference between every two of the 3 transformer oil temperature monitoring sensors (12) is lower than 1K, the internal temperature of the constant-temperature oil tank (6) is considered to be stable; after the internal temperatures of the constant temperature test box (1) and the constant temperature oil tank (6) are stable, starting an insulation resistance tester (14) to measure the conductor-ground insulation resistance of the test sleeve (2), and recording as R f Has a unit of 10 13 Omega.m, the power supply of the insulation resistance tester (14) is immediately disconnected after the data recording is finished;
after the operation is finished, the effective value of the output current of the adjustable alternating current power supply (17) is set to be I 1.0 、I 1.1 、I 1.2 …I 1.9 、I 2.0 The unit is A, and the current load coefficients a =1.0, 1.1, 1.2 \8230, 1.9, 2.0 are sequentially corresponded, wherein I 1.0 Rated current for the test casing (2);
the test casing (2) runs at I a When the fluctuation range of the temperature values acquired by the middle-layer temperature sensor array (8), the outer-layer temperature sensor array (9), the umbrella skirt surface temperature sensor array (10) and the sleeve bottom temperature sensor array (11) is smaller than 0.5K, the test sleeve (2) is considered to be in a stable state, the time from starting to the stable state of the test sleeve (2) is recorded, and the record is t a In units of hours; temperature data acquired by the middle layer temperature sensor array (8) are recorded and are sequentially recorded as T from bottom to top z-a-1 、T z-a-2 、T z-a-3 …T z-a-m And the maximum value is denoted as T z-a-max (ii) a Temperature data acquired by an outer layer temperature sensor array (9) are recorded and are sequentially recorded as T from bottom to top w-a-1 、T w-a-2 、T w-a-3 …T w-a-m And the maximum value is denoted as T w-a-max (ii) a Temperature data obtained by the umbrella skirt surface temperature sensor array (10) are recorded and are sequentially recorded as T from bottom to top s-a-1 、T s-a-2 、T s-a-3 …T s-a-n And the maximum value is denoted as T s-a-max (ii) a Note bookTemperature data acquired by a temperature sensor array (11) at the bottom of the recording sleeve are recorded as T from bottom to top in sequence d-a-1 、T d-a-2 、T d-a-3 …T d-a-h And the maximum value is denoted as T d-a-max (ii) a After the data are recorded, the power supply of the test sleeve (2) is disconnected, and then an insulation resistance tester (14) is started to measure the conductor-ground insulation resistance of the test sleeve (2), which is recorded as R a ；
Thirdly, calculating the external surface heat dissipation coefficient K of the lower casing with different current load coefficients s
If T d-a-h ＝T B If the test data is invalid, the test is carried out again until T d-a-h ≠T B ；
Fourthly, calculating the temperature rise coefficient K in the sleeve under different current load coefficients i-z 、K i-w
If R is a ＝R f If the test data is invalid, the test is repeated until R is reached a ≠R f ；
Fifthly, calculating the evaluation factor K of the current carrying capacity of the casing
Sixthly, evaluating the current carrying capacity of the oil-immersed transformer bushing under different current load coefficients
If K is more than or equal to 0 and less than 0.5, the transformer bushing can operate for a short time under the overload condition that the current load coefficient is a; if theta is larger than or equal to 0.5, the transformer bushing cannot operate under the overload condition with the current load coefficient of a.
The technical scheme has the advantages that a brand-new current carrying capacity assessment method is provided for the overcurrent operation working condition of the oil-immersed transformer bushing, the current carrying capacity of the oil-immersed transformer bushing can be accurately assessed, and the optimal design of the oil-immersed transformer bushing is facilitated.
Drawings
Fig. 1 is a flowchart of a method for evaluating current-carrying capacity of a bushing of an oil-immersed transformer according to the present invention.
Fig. 2 is a schematic structural diagram of a test platform for evaluating current carrying capacity of a bushing of an oil-immersed transformer according to the present invention.
Detailed Description
The following describes the process of the present invention in detail with reference to the accompanying drawings. It should be emphasized that the embodiments described herein are merely illustrative of the invention and do not limit the scope of the inventive concept and its claims.
Firstly, establishing an oil-immersed transformer bushing current-carrying capacity evaluation test platform
Oily formula transformer bushing overload capacity aassessment test platform includes: the device comprises a constant temperature test box (1), a test sleeve (2), epoxy impregnated paper (3), a sleeve jacket umbrella skirt (4), a central current-carrying conductor (5), a constant temperature oil tank (6), transformer oil (7), a middle-layer temperature sensor array (8), an outer-layer temperature sensor array (9), an umbrella skirt surface temperature sensor array (10), a sleeve bottom temperature sensor array (11), a transformer oil temperature monitoring sensor (12), an environmental temperature monitoring sensor (13), an insulation resistance tester (14), a grounding point (15), a data processing terminal (16) and an adjustable alternating current power supply (17);
the right side of the constant temperature test box (1) is provided with 3 environment temperature monitoring sensors (13) connected with the data processing terminal (16) and used for monitoring the internal temperature of the constant temperature test box (1) in real time; a middle-layer temperature sensor array (8) and an outer-layer temperature sensor array (9) which are connected with a data processing terminal (16) are arranged in the test sleeve (2) to respectively realize real-time monitoring of the surface temperature of the central current-carrying conductor (5) and the surface temperature of the epoxy impregnated paper (3), the number of sensors contained in the middle-layer temperature sensor array (8) and the outer-layer temperature sensor array (9) is M =36, and the sensors are numbered as 1, 2, 3, \\ 8230, M, M E [1, M ] from the bottom to the top in sequence; the method comprises the steps that an umbrella skirt surface temperature sensor array (10) connected with a data processing terminal (16) is installed on the surface of a sleeve sheath umbrella skirt (4), real-time monitoring of the surface temperature of the sleeve sheath umbrella skirt (4) is achieved, the number of umbrella skirt pieces contained in the sleeve sheath umbrella skirt (4) is N =20, the number of sensors contained in the corresponding umbrella skirt surface temperature sensor array (10) is N, and the sensors are numbered as 1, 2, 3, \8230, N E [1, N ] from the bottom to the top in sequence; the constant-temperature oil tank (6) is filled with transformer oil (7), and in order to realize real-time monitoring of the temperature of the transformer oil (7), 3 transformer oil temperature monitoring sensors (12) connected with a data processing terminal (16) are arranged in the constant-temperature oil tank (6); the bottom of a test sleeve (2) is immersed in transformer oil (7), a sleeve bottom temperature sensor array (11) connected with a data processing terminal (16) is installed at the bottom of the test sleeve (2), and the sleeve bottom temperature sensor array (11) comprises H =11 sensors which are sequentially marked as 1, 2, 3, \\ 8230;, H, H ∈ [1, H ]; one end of an insulation resistance tester (14) is connected with the central current-carrying conductor (5) of the test sleeve (2), and the other end of the insulation resistance tester is connected with the grounding point (15) and used for measuring the conductor-ground insulation resistance of the test sleeve (2); the adjustable alternating current power supply (17) is used for supplying power to the test sleeve (2), the insulation resistance tester (14) and the data processing terminal (16);
secondly, acquiring temperature data and insulation resistance data under different load coefficients
The temperature of the constant temperature test box (1) is set to be T A =300K, when the temperature difference between every two of the 3 ambient temperature monitoring sensors (13) is lower than 1K, the internal temperature of the constant temperature test chamber (1) is considered to be stable; the temperature of the constant-temperature oil tank (6) is set to be T B =350K, when the temperature difference between every two of the 3 transformer oil temperature monitoring sensors (12) is lower than 1K, the internal temperature of the constant-temperature oil tank (6) is considered to be stable; after the internal temperatures of the constant temperature test box (1) and the constant temperature oil tank (6) are stable, the insulation resistance tester (14) is started to measure the conductor-ground insulation resistance of the test sleeve (2), and the record is R f Has a unit of 10 13 Omega.m, the power supply of the insulation resistance tester (14) is immediately disconnected after the data recording is finished;
after the above operations are completed, the operations are sequentially setThe effective value of the output current of the adjustable alternating current power supply (17) is I 1.0 、I 1.1 、I 1.2 …I 1.9 、I 2.0 The unit is A, and the current load coefficients a =1.0, 1.1, 1.2 \8230, 1.9 and 2.0 are sequentially corresponded, wherein I 1.0 Rated current for the test casing (2);
the test casing (2) runs at I 1.5 When the fluctuation range of the temperature values acquired by the middle-layer temperature sensor array (8), the outer-layer temperature sensor array (9), the umbrella skirt surface temperature sensor array (10) and the sleeve bottom temperature sensor array (11) is smaller than 0.5K, the test sleeve (2) is considered to be operated to a stable state, the time from starting to the stable state of the test sleeve (2) is recorded, and the record is t 1.5 In units of hours; temperature data acquired by the middle layer temperature sensor array (8) are recorded and are sequentially recorded as T from bottom to top z-1.5-1 、T z-1.5-2 、T z-1.5-3 …T z-1.5-36 And the maximum value is denoted as T z-1.5-max (ii) a Temperature data acquired by an outer layer temperature sensor array (9) are recorded and are sequentially recorded as T from bottom to top w-1.5-1 、T w-1.5-2 、T w-1.5-3 …T w-1.5-36 And the maximum value is denoted as T w-1.5-max (ii) a Temperature data obtained by the umbrella skirt surface temperature sensor array (10) are recorded and are sequentially recorded as T from bottom to top s-1.5-1 、T s-1.5-2 、T s-1.5-3 …T s-1.5-20 And the maximum value is denoted as T s-1.5-max (ii) a Temperature data acquired by a temperature sensor array (11) at the bottom of the sleeve are recorded and are sequentially recorded as T from bottom to top d-1.5-1 、T d-1.5-2 、T d-1.5-3 …T d-1.5-11 And the maximum value is denoted as T d-1.5-max (ii) a After the data are recorded, the power supply of the test sleeve (2) is disconnected, and then an insulation resistance tester (14) is started to measure the conductor-ground insulation resistance of the test sleeve (2), which is recorded as R 1.5 ；
Thirdly, calculating the heat dissipation coefficient K of the outer surface of the lower sleeve with different current load coefficients s
The temperature data and the insulation resistance data of the umbrella skirt surface temperature sensor obtained in the second step are brought into the following formula, and the dispersion of the outer surface of the sleeve is calculatedThermal coefficient K s When the current load coefficient a =1.5, K is calculated s ＝2.6232；
Fourthly, calculating the temperature rise coefficient K inside the sleeve under different current load coefficients i-z 、K i-w
Substituting the temperature data of the middle layer temperature sensor and the temperature data of the outer layer temperature sensor obtained in the second step into the following formula, and calculating the temperature rise coefficient K inside the sleeve i-z 、K i-w When the current load factor a =1.5, K is calculated i-z ＝35.1065、K i-w ＝29.7525；
Fifthly, calculating the evaluation factor K of the current carrying capacity of the casing
The heat dissipation coefficient K of the outer surface of the sleeve obtained by the third step s And the fourth step of calculating the temperature rise coefficient K inside the sleeve i-z 、K i-w Substituting the formula into the formula, and calculating a casing current carrying capacity evaluation factor K to obtain K =0.3198;
and sixthly, evaluating the current carrying capacity of the oil-immersed transformer bushing under different current load coefficients, and when the current load coefficient a =1.5, calculating the evaluation factor of the current carrying capacity of the bushing, wherein the evaluation factor is more than or equal to 0 and less than 0.5, which indicates that the transformer bushing can run in a short time under the overload condition with the current load coefficient a.
The above examples serve only for the introduction of the invention and do not constitute the full scope of protection of the same, any non-inventive modifications, improvements etc. based on the invention, falling within the scope of protection of the claims.
Claims (1)
1. The method for evaluating the current carrying capacity of the oil-immersed transformer bushing is characterized by comprising the following steps of:
firstly, establishing a current-carrying capacity evaluation test platform for oil-immersed transformer bushing
Oily formula transformer bushing overload capacity aassessment test platform includes: the device comprises a constant temperature test box (1), a test sleeve (2), epoxy impregnated paper (3), a sleeve sheath umbrella skirt (4), a central current-carrying conductor (5), a constant temperature oil tank (6), transformer oil (7), a middle layer temperature sensor array (8), an outer layer temperature sensor array (9), an umbrella skirt surface temperature sensor array (10), a sleeve bottom temperature sensor array (11), a transformer oil temperature monitoring sensor (12), an environmental temperature monitoring sensor (13), an insulation resistance tester (14), a grounding point (15), a data processing terminal (16) and an adjustable alternating current power supply (17);
the right side of the constant temperature test box (1) is provided with 3 environment temperature monitoring sensors (13) connected with a data processing terminal (16) for monitoring the internal temperature of the constant temperature test box (1) in real time; a middle-layer temperature sensor array (8) and an outer-layer temperature sensor array (9) which are connected with a data processing terminal (16) are arranged in the test sleeve (2) to respectively realize real-time monitoring of the surface temperature of the central current-carrying conductor (5) and the surface temperature of the epoxy impregnated paper (3), the number of sensors contained in the middle-layer temperature sensor array (8) and the outer-layer temperature sensor array (9) is M, and the sensors are sequentially marked as 1, 2, 3, 8230, M, M belongs to [1, M ]; an umbrella skirt surface temperature sensor array (10) connected with a data processing terminal (16) is arranged on the surface of a sleeve sheath umbrella skirt (4), so that the real-time monitoring of the surface temperature of the sleeve sheath umbrella skirt (4) is realized, the number of umbrella skirt pieces contained in the sleeve sheath umbrella skirt (4) is N, the number of sensors contained in the corresponding umbrella skirt surface temperature sensor array (10) is also N, and the sensors are marked as 1, 2, 3, \8230, N E [1, N ] in sequence from bottom to top; the constant-temperature oil tank (6) is filled with transformer oil (7), and in order to realize real-time monitoring of the temperature of the transformer oil (7), 3 transformer oil temperature monitoring sensors (12) connected with a data processing terminal (16) are installed in the constant-temperature oil tank (6); the bottom of a test sleeve (2) is immersed in transformer oil (7), a sleeve bottom temperature sensor array (11) connected with a data processing terminal (16) is installed at the bottom of the test sleeve (2), the sleeve bottom temperature sensor array (11) comprises H sensors, and the numbers of the H sensors are 1, 2, 3, \\8230;, H ∈ [1, H ]; one end of an insulation resistance tester (14) is connected with the central current-carrying conductor (5) of the test sleeve (2), and the other end of the insulation resistance tester is connected with the grounding point (15) and used for measuring the conductor-ground insulation resistance of the test sleeve (2); the adjustable alternating current power supply (17) is used for supplying power to the test sleeve (2), the insulation resistance tester (14) and the data processing terminal (16);
secondly, acquiring temperature data and insulation resistance data under different load coefficients
The temperature of the constant temperature test box (1) is set to be T A The unit is K, and when the temperature difference between every two of the 3 environment temperature monitoring sensors (13) is lower than 1K, the internal temperature of the constant temperature test box (1) is considered to be stable; the temperature of the constant-temperature oil tank (6) is set to be T B The unit is K, and when the temperature difference between every two of the 3 transformer oil temperature monitoring sensors (12) is lower than 1K, the internal temperature of the constant-temperature oil tank (6) is considered to be stable; after the internal temperatures of the constant temperature test box (1) and the constant temperature oil tank (6) are stable, the insulation resistance tester (14) is started to measure the conductor-ground insulation resistance of the test sleeve (2), and the record is R f Has a unit of 10 13 Omega.m, the power supply of the insulation resistance tester (14) is immediately disconnected after the data recording is finished;
after the operation is finished, the effective value of the output current of the adjustable alternating current power supply (17) is set to be I 1.0 、I 1.1 、I 1.2 …I 1.9 、I 2.0 The unit is A, and the current load coefficients a =1.0, 1.1, 1.2 \8230, 1.9, 2.0 are sequentially corresponded, wherein I 1.0 Rated current for the test casing (2);
the test casing (2) runs at I a When the fluctuation ranges of the temperature values acquired by the middle-layer temperature sensor array (8), the outer-layer temperature sensor array (9), the umbrella skirt surface temperature sensor array (10) and the sleeve bottom temperature sensor array (11) are smaller than 0.5K, the test is considered to be performedThe cannula (2) is run to steady state and the time taken for the test cannula (2) to go from start to steady state is recorded as t a In units of hours; temperature data acquired by the middle layer temperature sensor array (8) are recorded and are sequentially recorded as T from bottom to top z-a-1 、T z-a-2 、T z-a-3 …T z-a-m And the maximum value is denoted as T z-a-max (ii) a Temperature data acquired by an outer layer temperature sensor array (9) are recorded and are sequentially recorded as T from bottom to top w-a-1 、T w-a-2 、T w-a-3 …T w-a-m And the maximum value is denoted as T w-a-max (ii) a Temperature data acquired by the umbrella skirt surface temperature sensor array (10) are recorded and are sequentially recorded as T from bottom to top s-a-1 、T s-a-2 、T s-a-3 …T s-a-n And the maximum value is denoted as T s-a-max (ii) a Temperature data obtained by a temperature sensor array (11) at the bottom of the sleeve is recorded and is sequentially recorded as T from bottom to top d-a-1 、T d-a-2 、T d-a-3 …T d-a-h And the maximum value is denoted as T d-a-max (ii) a After the data are recorded, the power supply of the test sleeve (2) is disconnected, and then an insulation resistance tester (14) is started to measure the conductor-ground insulation resistance of the test sleeve (2), and the measured value is recorded as R a ；
Thirdly, calculating the heat dissipation coefficient K of the outer surface of the lower sleeve with different current load coefficients s
If T d-a-h ＝T B If the test data is invalid, the test is carried out again until T d-a-h ≠T B ；
Fourthly, calculating the temperature rise coefficient K inside the sleeve under different current load coefficients i-z 、K i-w
If R is a ＝R f If the test data is invalid, the test is repeated until R is reached a ≠R f ；
Fifthly, calculating the evaluation factor K of the current carrying capacity of the casing
Sixthly, evaluating the current carrying capacity of the oil-immersed transformer bushing under different current load coefficients
If K is more than or equal to 0 and less than 0.5, the transformer bushing can operate for a short time under the overload condition that the current load coefficient is a; if theta is larger than or equal to 0.5, the transformer bushing cannot operate under the overload condition with the current load coefficient of a.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116430182A (en) * | 2023-04-20 | 2023-07-14 | 广东电网有限责任公司佛山供电局 | Evaluation method for insulation ageing resistance of dry-type distribution transformer winding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116430182A (en) * | 2023-04-20 | 2023-07-14 | 广东电网有限责任公司佛山供电局 | Evaluation method for insulation ageing resistance of dry-type distribution transformer winding |
| CN116430182B (en) * | 2023-04-20 | 2023-12-05 | 广东电网有限责任公司佛山供电局 | Evaluation method for insulation ageing resistance of dry-type distribution transformer winding |
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