CN113984240B - Method, device and medium for calculating operating temperature of transformer - Google Patents
Method, device and medium for calculating operating temperature of transformer Download PDFInfo
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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Abstract
The application discloses a calculation method, a calculation device and a calculation medium for operating temperature of a transformer, which are applied to the field of circuits. Since the resistive loss is proportional to the temperature of the transformer and the spurious loss is inversely proportional to the temperature of the transformer, the operational temperature of the transformer can be obtained from the load loss of the transformer at the rated current, the resistive loss and the spurious loss at the operational temperature, and the reference temperature. According to the method, the temperature of the transformer at the moment can be obtained through calculation according to the basic parameters of the transformer and the electrical parameters of the current power meter, so that the temperature of the transformer can be monitored conveniently, the phenomenon that the service life of the transformer is influenced due to accelerated ageing of insulating materials is avoided, and the phenomenon that the transformer is burnt out due to overheat short-circuit fault is avoided.
Description
Technical Field
The present disclosure relates to the field of circuits, and in particular, to a method and an apparatus for calculating an operating temperature of a transformer, and a medium.
Background
The size of the operating temperature can be indirectly reflected to the operating loss of the transformer, the no-load loss of the transformer is mainly based on core loss and is basically not influenced by the temperature, the load loss of the transformer is mainly based on copper wire loss, the internal resistance loss is in direct proportion to the temperature, and the stray loss is in inverse proportion to the temperature. The traditional distribution transformer is not provided with a temperature on-line monitoring device generally, and the transformer protection only carries out setting action by overcurrent or overvoltage, and lacks temperature monitoring and protection.
The running temperature of the transformer is an important index reflecting the overall performance of the transformer, and the fact that the running temperature of the transformer is not monitored may lead to the fact that the temperature of the transformer is too high, so that the insulation material is aged rapidly to influence the normal service life of the transformer, and even the transformer is burnt due to overheat short-circuit fault.
Therefore, how to monitor the temperature of the transformer to avoid the accelerated aging of the insulating material or the occurrence of the overheat and short-circuit fault of the transformer is a problem to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a calculation method, a device and a medium for the operating temperature of a transformer, which are convenient for monitoring the temperature of the transformer so as to avoid the accelerated aging of insulating materials or the occurrence of overheat and short-circuit faults of the transformer.
In order to solve the above technical problems, the present application provides a method for calculating an operating temperature of a transformer, including:
obtaining the resistance loss and the stray loss of the transformer at rated current and operating temperature;
obtaining the load loss of the transformer at rated current and operating temperature;
and calculating the operating temperature of the transformer according to the load loss, the resistance loss and the stray loss of the transformer at rated current and operating temperature.
Preferably, the obtaining the resistance loss and the stray loss of the transformer at rated current and operating temperature is specifically:
calculating to obtain the resistance loss of the transformer at rated current and reference temperature according to the high-voltage side rated phase current effective value and the low-voltage side rated phase current effective value of the transformer and the high-voltage side winding phase resistance and the low-voltage side winding phase resistance at test temperature, and calculating to obtain the stray loss of the transformer at rated current and reference temperature according to the resistance loss and the load loss of the transformer at rated current and reference temperature;
and obtaining rated current, resistance loss and stray loss at the operating temperature according to the relation between the resistance loss, the stray loss and the temperature.
Preferably, the obtaining the load loss of the transformer at rated current and operating temperature is specifically:
and calculating according to the high-voltage side phase voltage effective value, the high-voltage side phase current effective value, the low-voltage side phase voltage effective value, the low-voltage side phase current effective value, the power factor phase angle, the voltage correction index, the low-voltage side rated phase voltage effective value and the rated voltage no-load loss of the transformer to obtain the load loss of the transformer under the rated current and the operating temperature.
Preferably, the obtaining the load loss of the transformer at rated current and operating temperature is specifically:
calculating according to the high-voltage side phase voltage effective value, the high-voltage side phase current effective value, the low-voltage side phase voltage effective value, the low-voltage side phase current effective value and the power factor phase angle of the transformer to obtain the active power consumed by the transformer;
calculating to obtain the on-load no-load loss under the actual current according to the effective value of the low-voltage side phase voltage of the transformer, the voltage correction index, the effective value of the low-voltage side rated phase voltage and the rated voltage no-load loss of the transformer;
calculating to obtain the on-load loss under the actual current according to the active power and the on-load loss;
the load loss at rated current and at operating temperature is obtained by the conversion of the on-load loss.
Preferably, the high-side phase voltage effective value, the high-side phase current effective value, the low-side phase voltage effective value, the low-side phase current effective value, and the power factor phase angle are relevant electrical parameters read by the electric energy meters and/or the power meters of the high-side and the low-side of the transformer in actual operation.
Preferably, after the calculation of the operating temperature of the transformer, the method further includes:
and if the operating temperature is higher than a threshold value, triggering an alarm device.
In order to solve the above technical problem, the present application further provides a device for calculating an operating temperature of a transformer, including:
the acquisition module is used for acquiring the resistance loss and the stray loss of the transformer at rated current and at the operating temperature and acquiring the load loss of the transformer at the rated current and at the operating temperature;
and the calculation module is used for calculating the operating temperature of the transformer according to the rated current, the load loss, the resistance loss and the stray loss of the transformer at the operating temperature.
In order to solve the above technical problem, the present application further provides a device for calculating an operating temperature of a transformer, including: a memory for storing a computer program;
and the processor is used for realizing the steps of the method for calculating the operating temperature of the transformer when executing the computer program.
In order to solve the above technical problem, the present application further provides a computer readable storage medium, where a computer program is stored on the computer readable storage medium, and the computer program when executed by a processor implements the steps of the method for calculating the operating temperature of the transformer.
The calculation method of the transformer at the operation temperature obtains the resistance loss and the stray loss of the transformer at the rated current and the operation temperature, and obtains the load loss of the transformer at the rated current and the operation temperature. Since the resistance loss is proportional to the temperature of the transformer and the spurious loss is inversely proportional to the temperature of the transformer, the load loss of the transformer at rated current and at operating temperature can be calculated by listing equations with reference to the temperature. According to the method, the temperature of the transformer at the moment can be obtained through calculation according to the basic parameters of the transformer and the electrical parameters of the current power meter, so that the temperature of the transformer can be monitored conveniently, the phenomenon that the service life of the transformer is influenced due to accelerated ageing of insulating materials is avoided, and the phenomenon that the transformer is burnt out due to overheat short-circuit fault is avoided.
The application also provides a device and a medium for calculating the operating temperature of the transformer, which correspond to the method, so that the method has the same beneficial effects as the method.
Drawings
For a clearer description of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for calculating an operating temperature of a transformer according to an embodiment of the present application;
FIG. 2 is a flowchart of another method for calculating the operating temperature of a transformer according to an embodiment of the present disclosure;
FIG. 3 is a block diagram of a transformer operating temperature calculation device according to an embodiment of the present disclosure;
fig. 4 is a block diagram of a transformer operating temperature calculating device according to another embodiment of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments herein without making any inventive effort are intended to fall within the scope of the present application.
The core of the application is to provide a method, a device and a medium for calculating the operating temperature of a transformer.
In order to provide a better understanding of the present application, those skilled in the art will now make further details of the present application with reference to the drawings and detailed description.
The temperature in-operation monitoring device is not installed in the general traditional transformer, and additionally, the temperature monitoring device is very complicated, so the application provides a mode for directly calculating the in-operation temperature of the transformer. Fig. 1 is a flowchart of a method for calculating an operating temperature of a transformer according to an embodiment of the present application, as shown in fig. 1, the method includes:
s10: obtaining the resistance loss and the stray loss of the transformer at rated current and operating temperature;
s11: the method comprises the steps of obtaining the load loss of a transformer at rated current and operating temperature;
s12: and calculating the operating temperature of the transformer according to the load loss, the resistance loss and the stray loss of the transformer at rated current and operating temperature.
Firstly, obtaining the resistance loss and the stray loss of the transformer at rated current and operating temperature; the load loss of the transformer at rated current and operating temperature is obtained; the specific manner of acquisition is not limited, and the relevant test data extracted in the factory test report can be used for calculating the resistance loss and the stray loss of the transformer under the rated current and the operating temperature according to the test data. The relevant electrical parameters can also be read from the power meters and/or the electric energy meters on the high-voltage side and the low-voltage side of the transformer when the transformer is in operation, and the load loss of the transformer at rated current and at operating temperature can be calculated according to the electrical parameters. Where resistive losses are proportional to temperature and spurious losses are inversely proportional to temperature. And then the load loss of the transformer at rated current and operating temperature, the resistance loss and stray loss at rated current and operating temperature, and the reference temperature are listed with equations, and the operating temperature of the transformer can be obtained by calculating the equations. Where the reference temperature and the test temperature are known amounts and the operating temperature is the desired unknown amount.
The calculation method of the transformer at the operation temperature provided by the embodiment of the application can acquire the resistance loss and the stray loss of the transformer at the rated current and the operation temperature, and acquire the load loss of the transformer at the rated current and the operation temperature. Since the resistance loss is proportional to the temperature of the transformer and the spurious loss is inversely proportional to the temperature of the transformer, the load loss of the transformer at rated current and at operating temperature can be calculated by listing equations with reference to the temperature. According to the method, the temperature of the transformer at the moment can be obtained through calculation according to the basic parameters of the transformer and the electrical parameters of the current power meter, so that the temperature of the transformer can be monitored conveniently, the phenomenon that the service life of the transformer is influenced due to accelerated ageing of insulating materials is avoided, and the phenomenon that the transformer is burnt out due to overheat short-circuit fault is avoided.
The above embodiments are not limited to how to obtain the resistive loss and the stray loss of the transformer at the rated current and at the operating temperature, and may specifically be: calculating to obtain the resistance loss of the transformer at rated current and reference temperature according to the high-voltage side rated phase current effective value and the low-voltage side rated phase current effective value of the transformer and the high-voltage side winding phase resistance and the low-voltage side winding phase resistance at the test temperature, and calculating to obtain the stray loss of the transformer at the rated current and the reference temperature according to the resistance loss and the load loss of the transformer at the rated current and the reference temperature; and obtaining rated current, resistance loss and stray loss at the operating temperature according to the relation between the resistance loss, the stray loss and the temperature.
The above implementation is not limited to how to obtain the load loss of the transformer at rated current and at operating temperature, and may specifically be: and calculating according to the high-voltage side phase voltage effective value, the high-voltage side phase current effective value, the low-voltage side phase voltage effective value, the low-voltage side phase current effective value, the power factor phase angle, the voltage correction index, the low-voltage side rated phase voltage effective value and the rated voltage no-load loss of the transformer to obtain the load loss of the transformer under the rated current and the operating temperature. Further, the obtaining of the load loss of the transformer at rated current and operating temperature is specifically: and calculating according to the high-voltage side phase voltage effective value, the high-voltage side phase current effective value, the low-voltage side phase voltage effective value, the low-voltage side phase current effective value and the power factor phase angle of the transformer to obtain the active power consumed by the transformer. And calculating the on-load loss under the actual current according to the low-voltage side phase voltage effective value, the voltage correction index, the low-voltage side rated phase voltage effective value and the rated voltage no-load loss of the transformer. And calculating the on-load loss under the actual current according to the active power and the on-load loss. The load loss at rated current and at operating temperature is obtained by conversion of the load loss at operation.
Fig. 2 is a flowchart of another method for calculating an operating temperature of a transformer according to an embodiment of the present application, as shown in fig. 2, the method includes:
s20: extracting no-load loss, load loss and winding resistance from a factory test report;
s21: calculating to obtain resistance loss and stray loss components of rated current and reference temperature;
s22: monitoring the current, the voltage and the power factor of the high-voltage side and the low-voltage side of the ammeter;
s23: converting the no-load loss under the rated voltage to the no-load loss under the operating voltage;
s24: calculating to obtain the active power consumed by the transformer;
s25: subtracting the no-load loss under the operation voltage to obtain the operation current and the load loss under the operation temperature;
s26: converting the running current and the load loss at the running temperature into rated current and the load loss at the running temperature;
s27: and finally obtaining the operating temperature of the transformer according to the rated current, the load loss at the operating temperature, the rated current, the resistance loss at the reference temperature and the stray loss component.
Wherein the relevant test data can be extracted and checked through the factory test report, and the specific known test data comprises the following steps: high-voltage side rated phase voltage effective value U 01 High-side rated phase current effective value I R Low-voltage side rated phase voltage effective value U 02 Low-voltage side rated phase current effective value I r The method comprises the steps of carrying out a first treatment on the surface of the No-load loss P at rated voltage 0 Rated current, reference temperature T 0 Lower load loss P k The method comprises the steps of carrying out a first treatment on the surface of the Test temperature T r Lower high side winding phase resistance (R A ，R B ，R C ) And low-side winding phase resistance (R a ，R b ，R c ). The related electrical parameters, namely the monitoring ammeter in the figure, can be read through the electric energy meters and/or the power meters at the high-voltage side and the low-voltage side of the operation transformer; specific known amounts of electrical parameters include: high-voltage side phase voltage effective value (U A ，U B ，U C ) High-voltage side phase current effective value (I A ，I B ，I C ) Phase angle of power factor (cos theta) A ，cosθ B ，cosθ C ) The method comprises the steps of carrying out a first treatment on the surface of the Low-voltage side phase voltage effective value (U a ，U b ，U c ) High-voltage side phase current effective value (I a ，I b ，I c ) Phase angle of power factor (cos theta) a ，cosθ b ，cosθ c ). After the related data are obtained, the load loss of the transformer at rated current and operating temperature, the resistance loss at rated current and reference temperature and the stray loss can be calculated; the specific calculation steps are as follows:
the load loss of the transformer at rated current and operating temperature is calculated specifically as follows:
1. calculating the active power consumed by the operational transformer, wherein the subtraction of the active power generated at the high-voltage side of the operational transformer and the active power generated at the low-voltage side of the operational transformer is the active power consumed by the operational transformerNamely:
2. active power consumed by the operational transformer itselfIt can be considered that no-load loss occurs in operation inside the transformerAnd loss at load>Composition, i.e.)>
3. No-load loss during operationIs not affected by the operating temperature T of the transformer 1 The size effect, which is related to the voltage at which the transformer operates, i.e. the loss during no-load operation +.>No-load loss P at rated voltage 0 The conversion relationships that exist are:
wherein n is a voltage correction index, and is related to the type of the iron core silicon steel sheet, the hot rolled silicon steel sheet n=1.8, and the cold rolled silicon steel sheet n=1.9-2. From this, the on-load loss can be calculated
4. To obtain the no-load loss in operationAfter that, the loss in the load can be calculated>Load loss->Not only is operated at temperature T by the transformer 1 The size influence is also related to the current of the transformer. Will be in the load loss->Load loss at operating temperature, scaled to rated current:
the resistance loss of the transformer at rated current and reference temperature and the stray loss are calculated specifically as follows:
according to rated current and reference temperature T in factory test report 0 Lower load loss P k Test temperature T r Lower high side winding phase resistance (R A ，R B ，R C ) And low-side winding phase resistance (R a ，R b ，R c ) The method can be used for obtaining: 1) Rated current, test temperature T r Lower resistance loss:
2) Rated current, reference temperature T 0 Lower resistance loss:
3) Rated current, reference temperature T 0 The following stray losses:
the resistance loss and the stray loss of the transformer at rated current and reference temperature and the load loss of the transformer at rated current and operating temperature are obtained. The transformer is operated at rated current and at operating temperature T 1 Load loss underFrom rated current, at operating temperature T 1 Lower resistance loss->And rated current, at operating temperature T 1 Stray losses underComposition, i.e.)>And the resistance loss in the load loss is in direct proportion to the temperature, and the stray loss is in inverse proportion to the temperature, so that the resistance loss under the rated current and the operating temperature can be obtained:
stray losses at rated current, at operating temperature:
substitution to obtain
Reference temperature in the aboveT 0 To a known quantity, the operating temperature T of the transformer is calculated 1 Namely solving the unitary quadratic equation of the above formula. Finally, the operating temperature of the transformer can be obtained:
the operating temperature T of the transformer is thus obtained 1 It should be noted that the calculation scheme provided in this embodiment is only one scheme provided in this application, and is not limited to other schemes.
When the running temperature of the transformer is monitored to exceed the threshold value, the condition that the temperature of the transformer is too high at the moment and faults are easy to occur is indicated, so that after the running temperature of the transformer is calculated, the method further comprises the following steps: if the operating temperature is higher than the threshold value, triggering an alarm device; the method can remind workers to take relevant safety measures to prevent equipment from high-temperature faults. The size of the threshold is not limited, and the transformer can be ensured to be in a normal working state according to the specific implementation; in addition, the type of the alarm device is not limited, and workers can be timely reminded of taking safety measures.
In the above embodiments, the method for calculating the operating temperature of the transformer is described in detail, and the application further provides a corresponding embodiment of the device for calculating the operating temperature of the transformer. It should be noted that the present application describes an embodiment of the device portion from two angles, one based on the angle of the functional module and the other based on the angle of the hardware.
Based on the angle of the functional module, this embodiment provides a device for calculating the operating temperature of a transformer, and fig. 3 is a structural diagram of the device for calculating the operating temperature of a transformer, as shown in fig. 3, where the device includes:
an acquisition module 10 for acquiring the resistance loss and the stray loss of the transformer at rated current and at operating temperature, and acquiring the load loss of the transformer at rated current and at operating temperature;
the calculation module 11 is used for calculating the operating temperature of the transformer according to the rated current, the load loss, the resistance loss and the stray loss of the transformer at the operating temperature.
Since the embodiments of the apparatus portion and the embodiments of the method portion correspond to each other, the embodiments of the apparatus portion are referred to the description of the embodiments of the method portion, and are not repeated herein.
The device for calculating the operating temperature of the transformer provided by the embodiment corresponds to the method, so that the device has the same beneficial effects as the method.
Based on the hardware angle, the present embodiment provides another device for calculating the operating temperature of a transformer, and fig. 4 is a structural diagram of the device for calculating the operating temperature of a transformer according to another embodiment of the present application, as shown in fig. 4, where the device for calculating the operating temperature of a transformer includes: a memory 20 for storing a computer program;
a processor 21 for carrying out the steps of the method of calculating the operating temperature of the transformer as mentioned in the above embodiments when executing a computer program.
The calculation device for the operating temperature of the transformer provided in this embodiment may include, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer, or the like.
Processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 may be implemented in hardware in at least one of a digital signal processor (Digital Signal Processor, DSP), a Field programmable gate array (Field-Programmable Gate Array, FPGA), a programmable logic array (Programmable Logic Array, PLA). The processor 21 may also comprise a main processor, which is a processor for processing data in an awake state, also called central processor (Central Processing Unit, CPU), and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 21 may be integrated with an image processor (Graphics Processing Unit, GPU) for rendering and rendering of content required to be displayed by the display screen. In some embodiments, the processor 21 may also include an artificial intelligence (Artificial Intelligence, AI) processor for processing computing operations related to machine learning.
Memory 20 may include one or more computer-readable storage media, which may be non-transitory. Memory 20 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 20 is at least used for storing a computer program 201, where the computer program, when loaded and executed by the processor 21, can implement the relevant steps of the method for calculating the operating temperature of the transformer disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may further include an operating system 202, data 203, and the like, where the storage manner may be transient storage or permanent storage. The operating system 202 may include Windows, unix, linux, among others. The data 203 may include, but is not limited to, data related to a method of calculating an operating temperature of the transformer, and the like.
In some embodiments, the computing device for operating the transformer may further include a display 22, an input/output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.
Those skilled in the art will appreciate that the configuration shown in fig. 4 is not limiting of the transformer's computing device at operating temperature and may include more or fewer components than shown.
The device for calculating the operating temperature of the transformer, provided by the embodiment of the application, comprises a memory and a processor, wherein the processor can realize the following method when executing a program stored in the memory: the method for calculating the operating temperature of the transformer.
The device for calculating the operating temperature of the transformer provided by the embodiment corresponds to the method, so that the device has the same beneficial effects as the method.
Finally, the present application also provides a corresponding embodiment of the computer readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps as described in the method embodiments above.
It will be appreciated that the methods of the above embodiments, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored on a computer readable storage medium. With such understanding, the technical solution of the present application, or a part contributing to the prior art or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, performing all or part of the steps of the method described in the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The computer readable storage medium provided in the present embodiment corresponds to the above method, and thus has the same advantageous effects as the above method.
The method, the device and the medium for calculating the operating temperature of the transformer are described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (9)
1. A method for calculating an operating temperature of a transformer, comprising:
obtaining the resistance loss and the stray loss of the transformer at rated current and operating temperature; wherein the resistance loss at rated current and operating temperatureThe calculation formula of (2) is as follows:
stray losses at rated current, at operating temperatureThe calculation formula of (2) is as follows:
for the resistance loss at rated current, reference temperature, < >>For stray losses at rated current, reference temperature, T 0 For reference temperature, T 1 Is at the operating temperature;
obtaining the load loss of the transformer at rated current and operating temperatureThe calculation formula is as follows:
calculating the operating temperature of the transformer according to the rated current, the load loss, the resistance loss and the stray loss of the transformer at the operating temperature; the formula is as follows:
2. the method for calculating the operating temperature of the transformer according to claim 1, wherein the obtaining the resistance loss and the stray loss of the transformer at the rated current and the operating temperature is specifically:
calculating to obtain the resistance loss of the transformer at rated current and reference temperature according to the high-voltage side rated phase current effective value and the low-voltage side rated phase current effective value of the transformer and the high-voltage side winding phase resistance and the low-voltage side winding phase resistance at test temperature, and calculating to obtain the stray loss of the transformer at rated current and reference temperature according to the resistance loss and the load loss of the transformer at rated current and reference temperature;
and obtaining rated current, resistance loss and stray loss at the operating temperature according to the relation between the resistance loss, the stray loss and the temperature.
3. The method for calculating the operating temperature of the transformer according to claim 1, wherein the step of obtaining the load loss of the transformer at the rated current and the operating temperature is specifically:
and calculating according to the high-voltage side phase voltage effective value, the high-voltage side phase current effective value, the low-voltage side phase voltage effective value, the low-voltage side phase current effective value, the power factor phase angle, the voltage correction index, the low-voltage side rated phase voltage effective value and the rated voltage no-load loss of the transformer to obtain the load loss of the transformer under the rated current and the operating temperature.
4. A method for calculating an operating temperature of a transformer according to claim 3, wherein the obtaining a load loss of the transformer at a rated current and at the operating temperature is specifically:
calculating according to the high-voltage side phase voltage effective value, the high-voltage side phase current effective value, the low-voltage side phase voltage effective value, the low-voltage side phase current effective value and the power factor phase angle of the transformer to obtain the active power consumed by the transformer;
calculating to obtain the on-load no-load loss under the actual current according to the effective value of the low-voltage side phase voltage of the transformer, the voltage correction index, the effective value of the low-voltage side rated phase voltage and the rated voltage no-load loss of the transformer;
calculating to obtain the on-load loss under the actual current according to the active power and the on-load loss;
the load loss at rated current and at operating temperature is obtained by the conversion of the on-load loss.
5. The method according to claim 3 or 4, wherein the high-side phase voltage effective value, the high-side phase current effective value, the low-side phase voltage effective value, the low-side phase current effective value, and the power factor phase angle are relevant electrical parameters read by the electric energy meters and/or the power meters of the high-side and the low-side of the transformer in actual operation.
6. The method for calculating the operating temperature of the transformer according to claim 1, wherein the calculating the operating temperature of the transformer further comprises:
and if the operating temperature is higher than a threshold value, triggering an alarm device.
7. A device for calculating the operating temperature of a transformer, comprising:
the acquisition module is used for acquiring the resistance loss and the stray loss of the transformer at rated current and at the operating temperature and acquiring the load loss of the transformer at the rated current and at the operating temperature; wherein the resistance loss at rated current and operating temperatureThe calculation formula of (2) is as follows:
stray losses at rated current, at operating temperatureThe calculation formula of (2) is as follows:
for the resistance loss at rated current, reference temperature, < >>For stray losses at rated current, reference temperature, T 0 For reference temperature, T 1 Is at the operating temperature;
load loss at rated current, at operating temperatureThe calculation formula is as follows:
the calculation module is used for calculating the operating temperature of the transformer according to the rated current, the load loss, the resistance loss and the stray loss of the transformer at the operating temperature; the formula is as follows:
8. a computing device for operating a transformer at an operating temperature, comprising a memory for storing a computer program;
a processor for implementing the steps of the method for calculating the operating temperature of a transformer according to any one of claims 1 to 6 when executing said computer program.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, implements the steps of the method for calculating the operating temperature of a transformer according to any one of claims 1 to 6.
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| CN109341881A (en) * | 2018-10-17 | 2019-02-15 | 浙江华电器材检测研究所有限公司 | Transformer temperature rise automatic checkout system and method |
| CN110988529A (en) * | 2019-11-26 | 2020-04-10 | 国网山西省电力公司电力科学研究院 | Heat source distribution determination method in transformer hot spot temperature multi-physical field calculation |
| CN112214892A (en) * | 2020-10-13 | 2021-01-12 | 天威保变（秦皇岛）变压器有限公司 | Method for calculating harmonic-contained load loss of converter transformer |
| CN112598298A (en) * | 2020-12-25 | 2021-04-02 | 武汉瑞莱保科技有限公司 | Power transformer health management system and management method |
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| US20130221983A1 (en) * | 2012-02-28 | 2013-08-29 | GridSense, Inc. | Systems and methods for providing transformer ratings using harmonics data |
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| CN105548767A (en) * | 2016-01-04 | 2016-05-04 | 国家电网公司 | Power transformer loss live-line measurement and hot spot temperature prediction system and method |
| CN109341881A (en) * | 2018-10-17 | 2019-02-15 | 浙江华电器材检测研究所有限公司 | Transformer temperature rise automatic checkout system and method |
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