CN112924786B - Method and device for testing temperature rise characteristic of thermal simulation device of transformer winding temperature controller - Google Patents
Method and device for testing temperature rise characteristic of thermal simulation device of transformer winding temperature controller Download PDFInfo
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- CN112924786B CN112924786B CN202110119893.1A CN202110119893A CN112924786B CN 112924786 B CN112924786 B CN 112924786B CN 202110119893 A CN202110119893 A CN 202110119893A CN 112924786 B CN112924786 B CN 112924786B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G01R31/62—Testing of transformers
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a method for testing the temperature rise characteristic of a thermal simulation device of a transformer winding temperature controller, which comprises the following steps: when the internal temperature of the transformer is consistent with the ambient temperature, respectively reading the current temperature indication values of the winding temperature controller and the oil level temperature controller; calculating a target heating current according to the rated load current of the transformer and the transformation ratio of the current transformer, and outputting the current to the winding temperature controller through a constant current source device; the electric heating element enables the temperature indication value of the winding temperature controller to rise, when the temperature indication value is kept stable within a preset time range, the current temperature indication values of the winding temperature controller and the oil surface temperature controller are respectively read, and the temperature rise generated by the corresponding target heating current of the winding temperature controller thermal simulation device under the rated load current of the transformer is calculated according to the four temperature values. The method provided by the invention can complete the temperature rise characteristic test of the thermal simulation device of the temperature controller without a constant temperature oil tank, can simultaneously measure and correct the additional influence of the environmental temperature change on the oil temperature of the transformer, and has strong real-time performance and high accuracy of the simulation result.
Description
Technical Field
The invention relates to the technical field of transformer performance testing, in particular to a method and a device for testing temperature rise characteristics of a thermal simulation device of a transformer winding temperature controller.
Background
The transformer is the most critical and expensive equipment in the power transmission and transformation equipment, and the operation reliability of the transformer is directly related to the economic operation and the safety and stability of a power grid. When the power transformer is in operation, the winding temperature is directly related to the insulation capacity and the service life of the transformer. In order to monitor the winding temperature of the transformer during operation, a transformer winding temperature controller is usually adopted, and the measurement principle is mainly that the copper-oil temperature difference of the transformer is measured by adopting a thermal simulation technology. The accuracy of the temperature rise characteristic of the thermal simulation device is directly related to the accuracy of the winding temperature measurement, so that the characteristic needs to be confirmed through periodic tests. However, due to the operation characteristics of the power transformer, most of the regular verification of the in-service winding temperature controllers needs to be carried out on the transformer site, but the temperature rise characteristics of the temperature controller thermal simulation device can only be tested in a special constant-temperature oil tank of a laboratory at present, and the constant-temperature oil tank is large in size and weight and cannot be carried to the transformer site for testing. The portable thermostatic bath applied to the on-site temperature indication value verification has small volume of the bath body and less working media, so that the heating element of the thermal simulation device generates heat during the temperature rise test to seriously affect the stability of the temperature in the bath, so that the test cannot be carried out, and the portable thermostatic bath cannot be applied to the on-site test of the temperature rise characteristic of the thermal simulation device of the temperature controller.
Aiming at the situations, the existing method for the field verification of the temperature rise characteristic of the winding temperature controller thermal simulation device can realize the verification under the condition without an additional thermostatic bath, but the method does not consider the additional error influence of the environmental temperature change on the test result in the test process, and once the environmental temperature change is large in the test process, the oil temperature of the transformer is also changed, so that the accuracy of the measurement result is influenced. Therefore, how to provide a method for testing the temperature rise characteristic of the thermal simulation device of the transformer winding temperature controller, which can perform field test and improve the simulation precision, is a problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a method and a device for testing the temperature rise characteristic of a thermal simulation device of a transformer winding temperature controller, which consider the additional influence of the environmental temperature change on the oil temperature of a transformer and realize the measurement and correction of the oil temperature change of an oil tank by using an oil surface temperature controller matched and installed with the transformer. The method can complete the test of the temperature rise characteristic of the thermal simulation device of the temperature controller without a constant temperature oil tank, solves the problem that the existing field verification method of the temperature rise characteristic of the thermal simulation device of the winding temperature controller is possibly influenced by the change of the environmental temperature, realizes the field test of the temperature rise characteristic of the thermal simulation device, and has strong real-time performance and high accuracy of a simulation result.
In order to overcome the defects in the prior art, an embodiment of the present invention provides a method for testing a temperature rise characteristic of a thermal simulation apparatus for a transformer winding temperature controller, including:
when the internal temperature of the transformer is consistent with the ambient temperature, reading current temperature indication values of the winding temperature controller and the oil surface temperature controller respectively to serve as a first temperature value and a second temperature value;
calculating a target heating current according to the rated load current of the transformer and the transformation ratio of the current transformer, and transmitting the target heating current to the winding temperature controller through a constant current source device;
the temperature indication values of the winding temperature controller and the oil surface temperature controller are increased through an electric heating element, and when the temperature indication values are kept stable within a preset time range, the current temperature indication values of the winding temperature controller and the oil surface temperature controller are respectively read and used as a third temperature value and a fourth temperature value;
and calculating the temperature rise of the winding temperature controller thermal simulation device under the corresponding rated load current of the transformer according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value.
Preferably, the calculating, according to the first temperature value, the second temperature value, the third temperature value, and the fourth temperature value, the temperature rise of the winding temperature controller thermal simulation apparatus under the corresponding rated load current of the transformer includes:
subtracting the third temperature value from the first temperature value to obtain a first temperature difference;
the fourth temperature value is differed from the second temperature value to obtain a compensation temperature difference;
and subtracting the first temperature difference from the compensation temperature difference to obtain the temperature rise of the winding temperature controller thermal simulation device generated under the corresponding rated negative charge current of the transformer.
Preferably, the method for determining the target heating current includes:
calculating the copper oil temperature difference of the transformer under full load according to the factory temperature rise data of the transformer; the copper-oil temperature difference is the difference between the winding hot point and the oil surface temperature;
and according to a factory temperature rise characteristic curve chart of the transformer, obtaining a compensation heating current corresponding to the copper oil temperature difference as a target heating current.
An embodiment of the present invention further provides a device for testing a temperature rise characteristic of a thermal simulation device for a transformer winding temperature controller, including:
the initial temperature acquisition module is used for respectively reading current temperature indicating values of the winding temperature controller and the oil surface temperature controller to serve as a first temperature value and a second temperature value when the internal temperature of the transformer is consistent with the ambient temperature;
the target heating current calculating module is used for calculating target heating current according to rated load current of the transformer and the transformation ratio of the current transformer and transmitting the target heating current to the winding temperature controller through the constant current source device;
the terminal temperature acquisition module is used for enabling temperature indication values of the winding temperature controller and the oil surface temperature controller to rise through an electric heating element, and respectively reading current temperature indication values of the winding temperature controller and the oil surface temperature controller to serve as a third temperature value and a fourth temperature value when the temperature indication values are kept stable within a preset time range;
and the temperature rise characteristic analysis module is used for calculating the temperature rise of the winding temperature controller thermal simulation device under the corresponding rated load current of the transformer according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value. And simultaneously, the additional influence of the environmental temperature change on the transformer oil temperature is measured and corrected through the indication of the oil level temperature controller.
Preferably, the temperature rise characteristic analysis module is further configured to,
the third temperature value is differed from the first temperature value to obtain a first temperature difference;
the fourth temperature value is differed from the second temperature value to obtain a compensation temperature difference;
and subtracting the first temperature difference from the compensation temperature difference to obtain the temperature rise of the winding temperature controller thermal simulation device generated under the corresponding rated negative charge current of the transformer.
Preferably, the target heating current calculating module is further configured to,
calculating the copper oil temperature difference of the transformer under full load according to the factory temperature rise data of the transformer; the copper-oil temperature difference is the difference between the winding hot point and the oil surface temperature;
and obtaining the compensation heating current corresponding to the copper oil temperature difference according to the factory temperature rise characteristic curve chart of the transformer to be used as the target heating current.
Compared with the prior art, the embodiment of the invention at least has the following beneficial effects:
1) the temperature rise characteristic of the temperature controller thermal simulation device can be tested on site without adding any other test equipment, the cost is low, and the real-time performance is strong;
2) measuring the variation of the environmental temperature in the test process, and correcting the additional influence of the variation on the temperature rise measurement result;
3) the accuracy and the reliability of the measurement of the in-service winding temperature controller are ensured, the method is easy to implement, and the applicability is very strong.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for testing a temperature rise characteristic of a thermal simulation device of a transformer winding temperature controller according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a test apparatus for thermal simulation of temperature rise characteristics of a transformer winding temperature controller according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are only for convenience of description and are not used as limitations on the order in which the steps are performed.
It is to be understood that 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 the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
In a first aspect:
referring to fig. 1, an embodiment of the present invention provides a method for testing a temperature rise characteristic of a thermal simulation apparatus of a transformer winding temperature controller, including:
s10, when the temperature in the transformer is consistent with the ambient temperature, reading the current temperature indication values of the winding temperature controller and the oil level temperature controller respectively as a first temperature value and a second temperature value;
s20, calculating a target heating current according to the rated load current of the transformer and the transformation ratio of the current transformer, and transmitting the target heating current to the winding temperature controller through a constant current source device;
s30, increasing the temperature indication values of the winding temperature controller and the oil level temperature controller through an electric heating element, and reading the current temperature indication values of the winding temperature controller and the oil level temperature controller respectively to serve as a third temperature value and a fourth temperature value when the temperature indication values are kept stable within a preset time range;
and S40, calculating the temperature rise of the winding temperature controller thermal simulation device under the corresponding rated load current of the transformer according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value.
It should be noted that, when the power transformer operates, the winding temperature is directly related to the insulation capability and the service life of the transformer. The transformer winding temperature controller is used for measuring and monitoring the winding temperature of the transformer, and is important measuring and protecting equipment for ensuring the safe operation of the transformer. The temperature controller adopts a thermal simulation technical device to measure the copper-oil temperature difference of the transformer, the accuracy of the temperature rise characteristic of the thermal simulation device is directly related to the accuracy of the winding temperature measurement, and the characteristic of the temperature controller needs to be confirmed through a periodic test. The power transformer operation characteristics determine that the regular verification of most in-service winding temperature controllers needs to be carried out on the transformer site, but the temperature rise characteristics of the temperature controller thermal simulation device can only be tested in a special constant-temperature oil tank in a laboratory at present, and the constant-temperature oil tank is large in size and weight and cannot be carried to the transformer site for testing. The portable thermostatic bath applied to the on-site temperature indication value verification has small volume of the bath body and less working media, so that the heating element of the thermal simulation device generates heat during the temperature rise test to seriously affect the stability of the temperature in the bath, so that the test cannot be carried out, and the portable thermostatic bath cannot be applied to the on-site test of the temperature rise characteristic of the thermal simulation device of the temperature controller. Although the prior art can realize calibration under the condition without an additional thermostatic bath, the method does not consider the additional error influence of the environmental temperature change on the test result in the test process, and if the oil temperature of the transformer is changed due to large environmental temperature change in the test process, a non-negligible additional error is caused on the measurement result. Therefore, the purpose of the embodiment is to provide a field test method for the temperature rise characteristic of the thermal simulation device of the transformer winding temperature controller, which is strong in real-time performance and high in detection precision.
Wherein, the temperature rise characteristic of the thermal simulation device of the transformer winding temperature controller is as follows: heating current I corresponding to the temperature controller thermal simulation device when rated load current of the transformer is IhTemperature rise during the process:
ΔT＝Ki×Ih 2×R；
wherein, KiFor the coefficients relating to the cooling structure of the transformer, IhR is the resistance of the winding for heating current, so that the temperature rise characteristic can be analyzed by calculating delta T;
specifically, in step S10, the temperature controller temperature package and the electrical heating element in the thermal simulation device are first kept normally mounted on the transformer, and when the transformer stops operating until the internal temperature of the transformer is reduced to be consistent with the ambient temperature, the temperature indications of the winding temperature controller and the oil level temperature controller are respectively read out as a first temperature value and a second temperature value, which are respectively marked as T11And T12；
In step S20, a target heating current is calculated from the rated load current of the transformer and the current transformer transformation ratio, and is denoted as Ib(ii) a And passing a target heating current through the heaterThe flow source device is transmitted to the winding temperature controller and the oil surface temperature controller; it should be noted that the current transformer is an instrument for converting a large primary-side current into a small secondary-side current according to the electromagnetic induction principle to measure. The current transformer is composed of a closed iron core and a winding. The primary side winding of the transformer has few turns and is connected in a circuit of the current to be measured. The current transformers can be classified into dry type current transformers, cast type current transformers, oil immersed type current transformers, gas insulated current transformers, and the like according to insulating media. In this embodiment, the current transformer is preferably an oil-immersed current transformer, and the constant current source device is preferably a constant current source composed of triodes of the same type; it should be noted that the oil-immersed current transformer and the constant current source composed of the triodes of the same type are only an optimal mode of the embodiment, and may be adjusted according to actual requirements in practical application, and no limitation is made herein.
In particular, IbThe determination method comprises the following steps:
1) according to the temperature rise data of the transformer provided by the transformer manufacturer, the copper oil temperature difference of the transformer under full load, namely the difference between the winding hot spot and the oil surface temperature, is recorded as delta T
2) Checking a temperature rise characteristic curve chart given by a winding thermometer manufacturer according to the magnitude of the delta T, and determining to obtain the compensation heating current I corresponding to the delta Th；
Further, in step S30, the temperature indication values of the winding temperature controller and the oil level temperature controller are increased by the electric heating element, and when the temperature indication values are kept stable within a preset time range, the current temperature indication values of the winding temperature controller and the oil level temperature controller are respectively read as a third temperature value and a fourth temperature value. Are respectively marked as T21And T22(ii) a It will be appreciated that the predetermined time range is empirically determined, and may be selected, for example, as 45 minutes, or other preferred time range. It should be noted that the electric heating element includes a heater made of cast iron, cast copper, or cast aluminum.
In the formation of T21And T22After, binding of the previously obtained T11And T12(ii) a Heating current I of analog temperature controller thermal analog device when rated load current of transformer is IhThe temperature rise generated:
ΔT′＝(T21-T11)-(T22-T12)；
it can be understood that the method approximately regards the interior of the transformer as a large constant temperature groove body with stable temperature, tests the temperature rise characteristic of the winding temperature controller thermal simulation device under the current environment temperature condition, measures the oil temperature variation caused by the environment temperature variation in the test process through the oil surface temperature controller on the transformer, and calculates and corrects the oil temperature variation.
The temperature rise characteristic test of the temperature controller thermal simulation device can be completed without a constant temperature oil groove, the additional influence of the environmental temperature change on the transformer oil temperature can be measured and corrected simultaneously, the real-time performance is strong, and the accuracy of the simulation result is high.
In a second aspect:
referring to fig. 2, an embodiment of the present invention further provides a device for testing a temperature rise characteristic of a thermal simulation device of a transformer winding temperature controller, including:
the initial temperature acquisition module 01 is used for respectively reading current temperature indication values of the winding temperature controller and the oil surface temperature controller to serve as a first temperature value and a second temperature value when the internal temperature of the transformer is consistent with the ambient temperature;
the target heating current calculating module 02 is used for calculating a target heating current according to the rated load current of the transformer and the transformation ratio of the current transformer and transmitting the target heating current to the winding temperature controller through a constant current source device;
a termination temperature obtaining module 03, configured to raise temperature indication values of the winding temperature controller and the oil level temperature controller through an electric heating element, and when the temperature indication values are kept stable within a preset time range, respectively read current temperature indication values of the winding temperature controller and the oil level temperature controller, where the current temperature indication values are used as a third temperature value and a fourth temperature value;
and the temperature rise characteristic analysis module 04 is used for calculating the temperature rise of the winding temperature controller thermal simulation device under the corresponding rated load current of the transformer according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value.
It is understood that in the present embodiment, the functional modules 01 to 04 of the apparatus respectively execute the steps S10 to S40, and it should be noted that,
the temperature rise characteristic of the thermal simulation device of the transformer winding temperature controller is as follows: heating current I corresponding to the temperature controller thermal simulation device when rated load current of the transformer is IhTemperature rise during the process:
ΔT＝Ki×Ih 2×R；
wherein, KiFor the coefficients relating to the cooling structure of the transformer, IhR is the resistance of the winding for heating current, so that the temperature rise characteristic can be analyzed by calculating delta T;
specifically, in step S10, the temperature controller thermal bulb and the electrical heating element in the thermal simulation device are first kept normally mounted on the transformer, and when the transformer is shut down and its internal temperature drops to be consistent with the ambient temperature, the temperature indications of the winding temperature controller and the oil level temperature controller are respectively read out as a first temperature value and a second temperature value, which are respectively marked as T11And T12；
In step S20, a target heating current is calculated from the rated load current of the transformer and the current transformer transformation ratio, and is denoted as Ib(ii) a And transmitting the target heating current to the winding temperature controller and the oil surface temperature controller through a constant current source device; it should be noted that the current transformer is an instrument for converting a large primary current into a small secondary current according to the electromagnetic induction principle to measure. The current transformer is composed of a closed iron core and a winding. The primary side winding of the transformer has few turns and is connected in a circuit of the current to be measured. The current transformers can be classified into dry type current transformers, cast type current transformers, oil immersed type current transformers, gas insulated current transformers, and the like according to insulating media. In this embodiment, the current transformer is preferably an oil-immersed current transformer, and the constant current source device is preferably a constant current source composed of triodes of the same type; to say thatIt should be noted that the oil-immersed current transformer and the constant current source composed of the triodes of the same type are only a preferred mode of the embodiment, and can be adjusted according to actual requirements in practical application, and no limitation is made here.
In particular, IbThe determination method comprises the following steps:
1) according to the temperature rise data of the transformer provided by the transformer manufacturer, the copper oil temperature difference of the transformer under full load, namely the difference between the winding hot spot and the oil surface temperature, is recorded as delta T
2) Checking a temperature rise characteristic curve chart given by a winding thermometer manufacturer according to the magnitude of the delta T, and determining to obtain the compensation heating current I corresponding to the delta Th；
Further, in step S30, the temperature indication values of the winding temperature controller and the oil level temperature controller are increased by the electric heating element, and when the temperature indication values are kept stable within a preset time range, the current temperature indication values of the winding temperature controller and the oil level temperature controller are respectively read as a third temperature value and a fourth temperature value. Are respectively marked as T21And T22(ii) a It will be appreciated that the predetermined time range is empirically determined, and may be selected, for example, as 45 minutes, or other preferred time range. It should be noted that the electric heating element includes a heater made of cast iron, cast copper, or cast aluminum.
Is obtained as T21And T22After, binding of the previously obtained T11And T12(ii) a Heating current I of analog temperature controller thermal analog device when rated load current of transformer is IhThe temperature rise generated:
ΔT′＝(T21-T11)-(T22-T12)；
it can be understood that the method approximately regards the interior of the transformer as a large constant temperature groove body with stable temperature, tests the temperature rise characteristic of the winding temperature controller thermal simulation device under the current environment temperature condition, measures the oil temperature variation caused by the environment temperature variation in the test process through the oil surface temperature controller on the transformer, and calculates and corrects the oil temperature variation.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (4)
1. A test method for temperature rise characteristics of a thermal simulation device of a transformer winding temperature controller is characterized by comprising the following steps:
when the internal temperature of the transformer is consistent with the ambient temperature, reading current temperature indication values of the winding temperature controller and the oil surface temperature controller respectively to serve as a first temperature value and a second temperature value;
calculating a target heating current according to the rated load current of the transformer and the transformation ratio of the current transformer, and transmitting the target heating current to the winding temperature controller and the oil surface temperature controller through a constant current source device;
the temperature indication values of the winding temperature controller and the oil surface temperature controller are increased through an electric heating element, and when the temperature indication values are kept stable within a preset time range, the current temperature indication values of the winding temperature controller and the oil surface temperature controller are respectively read and used as a third temperature value and a fourth temperature value;
calculating the temperature rise of the winding temperature controller thermal simulation device under the corresponding rated load current of the transformer according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value;
wherein, the calculating the temperature rise of the winding temperature controller thermal simulation device under the corresponding rated load current of the transformer according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value comprises:
the third temperature value is differed from the first temperature value to obtain a first temperature difference;
the fourth temperature value is differed from the second temperature value to obtain a compensation temperature difference;
and subtracting the first temperature difference from the compensation temperature difference to obtain the temperature rise of the winding temperature controller thermal simulation device generated under the corresponding rated negative charge current of the transformer.
2. The method for testing the temperature rise characteristic of the thermal simulation device of the transformer winding temperature controller according to claim 1, wherein the method for determining the target heating current comprises the following steps:
calculating the copper oil temperature difference of the transformer under full load according to the factory temperature rise data of the transformer; the copper-oil temperature difference is the difference between the winding hot point and the oil surface temperature;
and obtaining the compensation heating current corresponding to the copper oil temperature difference according to the factory temperature rise characteristic curve chart of the transformer to be used as the target heating current.
3. The utility model provides a test device of transformer winding temperature controller thermal simulation device temperature rise characteristic which characterized in that includes:
the initial temperature acquisition module is used for respectively reading current temperature indicating values of the winding temperature controller and the oil surface temperature controller to serve as a first temperature value and a second temperature value when the internal temperature of the transformer is consistent with the ambient temperature;
the target heating current calculating module is used for calculating target heating current according to rated load current of the transformer and the transformation ratio of the current transformer and transmitting the target heating current to the winding temperature controller and the oil surface temperature controller through a constant current source device;
the terminal temperature acquisition module is used for enabling temperature indication values of the winding temperature controller and the oil surface temperature controller to rise through an electric heating element, and respectively reading current temperature indication values of the winding temperature controller and the oil surface temperature controller to serve as a third temperature value and a fourth temperature value when the temperature indication values are kept stable within a preset time range;
the temperature rise characteristic analysis module is used for calculating the temperature rise of the winding temperature controller thermal simulation device under the corresponding rated load current of the transformer according to the first temperature value, the second temperature value, the third temperature value and the fourth temperature value;
the temperature rise characteristic analysis module is also used for,
the third temperature value is differed from the first temperature value to obtain a first temperature difference;
the fourth temperature value is differed from the second temperature value to obtain a compensation temperature difference;
and subtracting the first temperature difference from the compensation temperature difference to obtain the temperature rise of the winding temperature controller thermal simulation device generated under the corresponding rated negative charge current of the transformer.
4. The device for testing the temperature rise characteristics of the thermal simulation device of the winding temperature controller of the transformer according to claim 3, wherein the target heating current calculating module is further configured to,
calculating the copper oil temperature difference of the transformer under full load according to the factory temperature rise data of the transformer; the copper-oil temperature difference is the difference between the winding hot point and the oil surface temperature;
and according to a factory temperature rise characteristic curve chart of the transformer, obtaining a compensation heating current corresponding to the copper oil temperature difference as a target heating current.
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| CN103148965A (en) * | 2013-02-26 | 2013-06-12 | 广东电网公司电力科学研究院 | Temperature rise characteristic field testing method of thermal simulation device of transformer winding temperature controller |
| CN103292922A (en) * | 2013-05-14 | 2013-09-11 | 国家电网公司 | Winding temperature measuring method of oil-immersed power transformer |
| CN108362402A (en) * | 2018-04-02 | 2018-08-03 | 广东电网有限责任公司 | A kind of winding temperature table copper oil temperature difference simulation test device |
| CN111426404A (en) * | 2020-04-06 | 2020-07-17 | 甘书宇 | Transformer temperature measuring system and measuring method |
| CN111579899A (en) * | 2020-04-26 | 2020-08-25 | 云南电网有限责任公司电力科学研究院 | Transformer fault simulation test system and method |
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