CN113740657B - Method and system for online checking capacity of single high-power-supply high-count distribution transformer - Google Patents
Method and system for online checking capacity of single high-power-supply high-count distribution transformer Download PDFInfo
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Abstract
The invention discloses a method and a system for checking the capacity of a single high-power-supply high-count distribution transformer on line, wherein the method comprises the following steps: calculating a two-phase power angle of a certain acquisition point, so that the difference of the two-phase power angles to the certain acquisition point is obtained; calculating the converted two-phase power angle difference of a certain acquisition point, so that a converted two-phase power angle difference sequence formed by each acquisition point is obtained; calculating a converted two-phase active power difference of a certain acquisition point according to the two-phase voltage, the two-phase current, the two-phase active power and the two-phase power angle difference of the distribution transformer, so that a converted two-phase active power difference sequence formed by each acquisition point is formed; and performing linear fitting on the converted two-phase active power difference sequence and the converted two-phase power angle difference sequence to obtain a slope value, and comparing the slope value with a standard value to check the rated capacity of the distribution transformer. The rated capacity of the distribution transformer is checked according to the fitting result, large-scale investigation and checking are realized through existing measurement data, and the quality of the rated capacity checking of the distribution transformer is greatly improved.
Description
Technical Field
The invention belongs to the technical field of power distribution and utilization, and particularly relates to a method and a system for on-line checking of the capacity of a single high-power-supply high-count distribution transformer.
Background
The user of the special distribution transformer is required to execute single electricity price with the reporting capacity of 250kVA or below, the user does not count the basic electricity fee, two power generation steps can be executed with the reporting capacity of 315kVA or above, and the basic electricity fee is collected according to the reporting capacity of the special distribution transformer. However, in the actual installation process, in order to reduce the payment fee, the user of the dedicated distribution transformer may have the installation capacity smaller than the rated capacity, which brings economic loss to the power enterprise.
The special distribution transformers are numerous in number and cannot be checked one by one through an off-line means, therefore, the method for checking the capacity of the single high-voltage distribution transformer on line is designed on the basis of collecting voltage, current, active measurement data and reactive measurement data of the high-voltage side of the special distribution transformer by considering that the special distribution transformer is measured in a high-voltage supply and high-count mode, the rated capacity of the distribution transformer is checked automatically on line, and the method has important significance for improving power consumption lean management of power enterprises.
Disclosure of Invention
The invention provides a method and a system for checking the capacity of a single high-power-supply high-count distribution transformer on line, which are used for at least solving the problem that the rated capacity of the distribution transformer cannot be checked one by one.
In a first aspect, the invention provides an online checking method for the capacity of a single high-power-supply high-count distribution transformer, which comprises the following steps: acquiring two-phase voltage, two-phase current, two-phase active power and two-phase reactive power of a distribution transformer; calculating a two-phase power angle of a certain acquisition point according to the two-phase active power and the two-phase reactive power of the distribution transformer, so that the difference of the two-phase power angles to the certain acquisition point is obtained; calculating the converted two-phase power angle difference of a certain acquisition point according to the two-phase current and the two-phase power angle difference of the distribution transformer, so as to form a converted two-phase power angle difference sequence to each acquisition point, wherein the expression for calculating the converted two-phase power angle difference of the certain acquisition point is as follows:
in the formula (I), wherein,
to convert into twoThe difference of the phase power angle is obtained,
、
respectively an a-phase current and a C-phase current,
the difference value of the phase A power angle and the phase C power angle is obtained; calculating a converted two-phase active power difference of a certain collection point according to the two-phase voltage, the two-phase current, the two-phase active power and the two-phase power angle difference of the distribution transformer, so that a converted two-phase active power difference sequence formed by each collection point is obtained, wherein an expression for calculating the converted two-phase active power difference of the certain collection point is as follows:
in the formula (I), wherein,
in order to convert the two-phase active power difference,
the active power of the C phase is obtained,
converting the active power of the A phase; and performing linear fitting on the converted two-phase active power difference sequence and the converted two-phase power angle difference sequence to obtain a slope value, and comparing the slope value with a standard value to check the rated capacity of the distribution transformer.
In a second aspect, the present invention provides an online checking system for the capacity of a single high-power-supply high-count distribution transformer, comprising: the acquisition module is configured to acquire two-phase voltage, two-phase current, two-phase active power and two-phase reactive power of the distribution transformer; a first calculation module configured to calculate a two-phase power angle of a certain collection point according to two-phase active power and two-phase reactive power of the distribution transformer, so that two phases to the certain collection pointPower angle difference; the second calculation module is configured to calculate a converted two-phase power angle difference of a certain collection point according to the two-phase current and the two-phase power angle difference of the distribution transformer, so that a converted two-phase power angle difference sequence formed by the collection points is obtained, wherein an expression for calculating the converted two-phase power angle difference of the certain collection point is as follows:
in the formula (I), wherein,
in order to convert the two-phase power angle difference,
、
respectively an a-phase current and a C-phase current,
the difference value of the phase A power angle and the phase C power angle is obtained; the third calculation module is configured to calculate a converted two-phase active power difference of a certain collection point according to the two-phase voltage, the two-phase current, the two-phase active power and the two-phase power angle difference of the distribution transformer, so that a converted two-phase active power difference sequence formed by the collection points is formed, wherein an expression for calculating the converted two-phase active power difference of the certain collection point is as follows:
in the formula (I), wherein,
in order to convert the two-phase active power difference,
the active power of the C phase is obtained,
converting the active power of the A phase; comparisonAnd the module is configured to perform linear fitting on the converted two-phase active power difference sequence and the converted two-phase power angle difference sequence to obtain a slope value, and compare the slope value with a standard value to check the rated capacity of the distribution transformer.
In a third aspect, an electronic device is provided, comprising: the system comprises at least one processor and a memory which is in communication connection with the at least one processor, wherein the memory stores instructions which can be executed by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the steps of the single high power supply and high power distribution transformer capacity online checking method in any embodiment of the invention.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, the computer program comprising program instructions, which when executed by a computer, cause the computer to perform the steps of a single high-power supply and high-power distribution transformer capacity online checking method according to any embodiment of the present invention.
According to the method and the system for online checking of the capacity of the single high-power-supply high-count distribution transformer, on the basis of obtaining voltage, current, active power and reactive power measurement data of the high-voltage side of the distribution transformer, linear fitting is carried out according to a converted two-phase power angle difference sequence and a converted two-phase active power difference sequence obtained through calculation, the rated capacity of the distribution transformer is checked according to a fitting result, large-scale investigation and checking through existing measurement data are achieved, and the quality checking effect of the rated capacity of the distribution transformer is greatly improved.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a method for checking the capacity of a single high-power-supply high-count distribution transformer on line according to an embodiment of the present invention;
fig. 2 is a flowchart of another method for checking the capacity of a single high-power-supply high-count distribution transformer on line according to an embodiment of the present invention;
fig. 3 is a block diagram of a structure of an online checking system for the capacity of a single high-power-supply high-count distribution transformer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, a flowchart of an online checking method for the capacity of a single high-power-supply high-count distribution transformer according to the present application is shown.
As shown in fig. 1, in step S101, two-phase voltage, two-phase current, two-phase active power, and two-phase reactive power of a distribution transformer are acquired;
in step S102, a two-phase power angle of a certain collection point is calculated according to two-phase active power and two-phase reactive power of the distribution transformer, so that a two-phase power angle difference to the certain collection point is obtained;
in step S103, calculating a converted two-phase power angle difference of a certain collection point according to the two-phase current and the two-phase power angle difference of the distribution transformer, so as to form a converted two-phase power angle difference sequence to each collection point, wherein an expression for calculating the converted two-phase power angle difference of the certain collection point is as follows:
，
in the formula (I), the compound is shown in the specification,
in order to convert the two-phase power angle difference,
、
respectively an a-phase current and a C-phase current,
the difference value of the phase A power angle and the phase C power angle is obtained;
in step S104, a converted two-phase active power difference of a certain collection point is calculated according to the two-phase voltage, the two-phase current, the two-phase active power and the two-phase power angle difference of the distribution transformer, so that a converted two-phase active power difference sequence is formed to each collection point, where an expression for calculating the converted two-phase active power difference of the certain collection point is:
，
in the formula (I), the compound is shown in the specification,
in order to convert the two-phase active power difference,
the active power of the C phase is obtained,
converting the active power of the A phase;
in step S105, a linear fitting is performed on the two-phase calculated active power difference sequence and the two-phase calculated power angle difference sequence to obtain a slope value, and the slope value is compared with a standard value, so that the rated capacity of the distribution transformer is checked.
The method of this embodiment includes installing a voltage transformer and a current transformer on the high-voltage side of a distribution transformer, collecting data such as two-phase voltage, two-phase current, two-phase active power, two-phase reactive power of the distribution transformer, collecting data at intervals of generally 30 minutes, uploading the collected data to a power collection system through a concentrator of the distribution transformer, calculating two-phase power angles of a certain collection point according to the two-phase active power and the two-phase reactive power of the distribution transformer, calculating a two-phase power angle difference to the certain collection point, further obtaining a converted two-phase power angle difference, calculating a converted two-phase active power difference of the certain collection point according to the two-phase voltage, the two-phase current, the two-phase active power and the two-phase power angle difference of the distribution transformer, and finally performing linear fitting on the converted two-phase power angle difference sequence and the converted two-phase active power difference sequence to obtain a slope value, and comparing the standard value with the standard value, wherein the rated capacity corresponding to the standard value which is closest to the standard value is the checking rated capacity of the distribution transformer, and further realizing the online checking of the capacity of the single high-power-supply high-count distribution transformer.
Referring to fig. 2, a flowchart of another method for checking the capacity of a single high-power-supply high-count distribution transformer on line according to the present application is shown.
As shown in fig. 2, the method for checking the capacity of a single high-power-supply high-count distribution transformer on line specifically comprises the following steps:
step 1) collecting data of two sides of voltage, current and the like of a distribution transformer
A voltage transformer and a current transformer are arranged at the high-voltage side outlet of the distribution transformer, and the acquired data comprises two-phase voltage (C:)
) Two-phase current (
) Two-phase active power (
) Two-phase reactive power (
) The collection interval is generally 30 minutes, and the collected data is subjected to power distribution transformationThe concentrator of the device is uploaded to an electricity utilization acquisition system.
Step 2) calculating a conversion A, C two-phase power angle difference and obtaining a two-phase power angle difference sequence
2.1) respectively calculating two power angles according to the active power and the reactive power of each collection point A, C:
in the formula (I), the compound is shown in the specification,
respectively an a-phase power angle and a C-phase power angle,
respectively an active power of phase A and an active power of phase C,
respectively A phase reactive power and C phase reactive power
Step 2.2) calculating the two-phase power angle difference:
（3）
step 2.3) calculating the converted two-phase power angle difference:
（4）
in the formula (I), the compound is shown in the specification,
in order to convert the two-phase power angle difference,
、
respectively an a-phase current and a C-phase current,
the difference value of the phase A power angle and the phase C power angle is obtained;
step 2.4), calculating each time acquisition point to obtain
And forming a converted two-phase power angle difference sequence.
Step 3) calculating a conversion A, C two-phase active power difference and obtaining a two-phase active power difference sequence
Step 3.1) calculating the converted A-phase active power:
（5）
in the formula (I), the compound is shown in the specification,
in order to convert the active power of the A phase,
is the active power of the phase A,
respectively an A phase voltage and a C phase voltage;
step 3.2) calculating a converted two-phase active power difference:
（6）
in the formula (I), the compound is shown in the specification,
in order to convert the two-phase active power difference,
the active power of the C phase is obtained,
converting the active power of the A phase;
step 3.3), calculating each time acquisition point to obtain
And forming a converted two-phase active power difference sequence.
And 4) carrying out linear fitting on the converted two-phase power angle difference sequence and the converted two-phase active power difference sequence to obtain a slope value.
Specifically, the slope value is a ratio of the converted two-phase power angle difference sequence to the converted two-phase active power difference sequence after linear fitting is performed on the converted two-phase power angle difference sequence and the converted two-phase active power difference sequence respectively.
Step 5) comparing the slope value with a standard value to obtain the checking limit capacity of the distribution transformer
And comparing the slope value with the values in the standard sequence, wherein the corresponding capacity closest to one item in the standard sequence is the checking rated capacity of the distribution transformer.
In summary, the method of the embodiment has the following beneficial effects:
(1) on the basis of collecting voltage, current, active power and reactive power measurement data of the high-voltage side of the distribution transformer, linear fitting is carried out on a converted two-phase power angle difference sequence and a converted two-phase active power difference sequence obtained through calculation, and therefore the rated capacity of the distribution transformer is checked according to a fitting result.
(2) The rated capacity of the distribution transformer does not need to be manually checked one by one, large-scale checking and checking are realized through the existing measurement data, and the checking quality and effect of the rated capacity of the distribution transformer are greatly improved.
(3) The distribution transformer with abnormal rated capacity is automatically analyzed without manual intervention, and the lean management level of power utilization of power enterprises is improved.
Referring to fig. 3, a block diagram of a capacity online checking system for a single high-power supply and high-power-consumption distribution transformer according to the present application is shown.
As shown in fig. 3, the online verification system 200 includes an obtaining module 210, a first calculating module 220, a second calculating module 230, a third calculating module 240, and a comparing module 250.
The obtaining module 210 is configured to obtain two-phase voltage, two-phase current, two-phase active power, and two-phase reactive power of the distribution transformer; the first calculation module 220 is configured to calculate a two-phase power angle of a certain collection point according to the two-phase active power and the two-phase reactive power of the distribution transformer, so that a difference of the two-phase power angle to the certain collection point is obtained; a second calculating module 230, configured to calculate a converted two-phase power angle difference of a certain collection point according to the two-phase current and the two-phase power angle difference of the distribution transformer, so as to form a converted two-phase power angle difference sequence to each collection point, where the expression for calculating the converted two-phase power angle difference of the certain collection point is:
in the formula (I), wherein,
in order to convert the two-phase power angle difference,
、
respectively an a-phase current and a C-phase current,
the difference value of the phase A power angle and the phase C power angle is obtained; a third calculating module 240, configured to calculate a converted two-phase active power difference of a certain collecting point according to the two-phase voltage, the two-phase current, the two-phase active power and the two-phase power angle difference of the distribution transformer, so that a converted two-phase active power difference sequence is formed to each collecting point, where an expression for calculating the converted two-phase active power difference of the certain collecting point is as follows:
in the formula (I), wherein,
in order to convert the two-phase active power difference,
the active power of the C phase is obtained,
converting the active power of the A phase; and the comparison module 250 is configured to perform linear fitting on the two-phase active power difference sequence and the two-phase power angle difference sequence to obtain a slope value, and compare the slope value with a standard value to check the rated capacity of the distribution transformer.
It should be understood that the modules depicted in fig. 3 correspond to various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are also applicable to the modules in fig. 3, and are not described again here.
In other embodiments, an embodiment of the present invention further provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, where the computer-executable instructions may execute the capacity online checking method for a single high-power-supply high-power-consumption distribution transformer in any of the above method embodiments;
as one embodiment, the computer-readable storage medium of the present invention stores computer-executable instructions configured to:
acquiring two-phase voltage, two-phase current, two-phase active power and two-phase reactive power of a distribution transformer;
calculating a two-phase power angle of a certain acquisition point according to the two-phase active power and the two-phase reactive power of the distribution transformer, so that the difference of the two-phase power angles to the certain acquisition point is obtained;
calculating a converted two-phase power angle difference of a certain acquisition point according to the two-phase current and the two-phase power angle difference of the distribution transformer, so that a converted two-phase power angle difference sequence is formed at each acquisition point;
calculating a converted two-phase active power difference of a certain acquisition point according to the two-phase voltage, the two-phase current, the two-phase active power and the two-phase power angle difference of the distribution transformer, so that a converted two-phase active power difference sequence formed by each acquisition point is formed;
and performing linear fitting on the converted two-phase active power difference sequence and the converted two-phase power angle difference sequence to obtain a slope value, and comparing the slope value with a standard value to check the rated capacity of the distribution transformer.
The computer-readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created from use of a single high-supply high-count distribution transformer capacity online check system, and the like. Further, the computer-readable storage medium may include high speed random access memory, and may also include memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the computer readable storage medium optionally includes memory remotely located from the processor, and these remote memories may be connected to a single high supply and high count distribution transformer capacity online verification system via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 4, the electronic device includes: a processor 310 and a memory 320. The electronic device may further include: an input device 330 and an output device 340. The processor 310, the memory 320, the input device 330, and the output device 340 may be connected by a bus or other means, such as the bus connection in fig. 4. The memory 320 is the computer-readable storage medium described above. The processor 310 executes various functional applications and data processing of the server by running the nonvolatile software programs, instructions and modules stored in the memory 320, that is, the method for checking the capacity of the single high-supply high-count distribution transformer online in the embodiment of the method is implemented. The input device 330 may receive input numeric or character information and generate key signal inputs related to user settings and function controls of a single high-power distribution transformer capacity online verification system. The output device 340 may include a display device such as a display screen.
The electronic device can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
As an embodiment, the electronic device is applied to a single high-power-supply high-count distribution transformer capacity online checking system, and is used for a client, and includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to:
acquiring two-phase voltage, two-phase current, two-phase active power and two-phase reactive power of a distribution transformer;
calculating a two-phase power angle of a certain acquisition point according to the two-phase active power and the two-phase reactive power of the distribution transformer, so that the difference of the two-phase power angles to the certain acquisition point is obtained;
calculating a converted two-phase power angle difference of a certain acquisition point according to the two-phase current and the two-phase power angle difference of the distribution transformer, so that a converted two-phase power angle difference sequence is formed at each acquisition point;
calculating a converted two-phase active power difference of a certain acquisition point according to the two-phase voltage, the two-phase current, the two-phase active power and the two-phase power angle difference of the distribution transformer, so that a converted two-phase active power difference sequence formed by each acquisition point is formed;
and performing linear fitting on the converted two-phase active power difference sequence and the converted two-phase power angle difference sequence to obtain a slope value, and comparing the slope value with a standard value to check the rated capacity of the distribution transformer.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods of the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A single high-power-supply high-count distribution transformer capacity online checking method is characterized by comprising the following steps:
acquiring two-phase voltage, two-phase current, two-phase active power and two-phase reactive power of a distribution transformer;
calculating a two-phase power angle of a certain acquisition point according to the two-phase active power and the two-phase reactive power of the distribution transformer, so that the difference of the two-phase power angles to the certain acquisition point is obtained;
calculating the converted two-phase power angle difference of a certain acquisition point according to the two-phase current and the two-phase power angle difference of the distribution transformer, so as to form a converted two-phase power angle difference sequence to each acquisition point, wherein the expression for calculating the converted two-phase power angle difference of the certain acquisition point is as follows: Δ θ z ═ IA*IA-IC*IC*Δθ，
Where Δ θ z is the two-phase power angle difference converted, IA、ICRespectively, phase A current and phase C current, Delta thetaThe difference value of the phase A power angle and the phase C power angle is obtained;
calculating a converted two-phase active power difference of a certain collection point according to the two-phase voltage, the two-phase current, the two-phase active power and the two-phase power angle difference of the distribution transformer, so that a converted two-phase active power difference sequence formed by each collection point is obtained, wherein an expression for calculating the converted two-phase active power difference of the certain collection point is as follows: delta PZ＝PC-Δθ*PAZ，
In the formula,. DELTA.PZFor converting two-phase active power difference, PCIs C-phase active power, PAZConverting the active power of the A phase;
and performing linear fitting on the converted two-phase active power difference sequence and the converted two-phase power angle difference sequence to obtain a slope value, and determining the capacity corresponding to a certain item value in the standard sequence closest to the slope value as the checking rated capacity of the distribution transformer, wherein the slope value is the ratio of the converted two-phase power angle difference sequence to the converted two-phase active power difference sequence.
2. The method for on-line checking the capacity of the single high-power-supply high-count distribution transformer according to claim 1, wherein the expression for calculating the converted A-phase active power is as follows: pAZ＝(PA*IC*UC)/(IA*UA)，
In the formula, PAZFor converting active power of phase A, PAIs active power of phase A, UA、UCThe voltage of the A phase and the voltage of the C phase are respectively.
3. The method for on-line checking the capacity of the single high power supply and high power distribution transformer according to claim 1, wherein the expression for calculating the difference between the A-phase power angle and the C-phase power angle is as follows:
where Δ θ is the two-phase power angle difference, θA、θCRespectively, A-phase power angle and C-phase power angle, PA、PCRespectively an active power of phase A and an active power of phase C, QA、QCRespectively, a phase reactive power and a phase C reactive power.
4. The utility model provides a single high power supply high count distribution transformer capacity checks system on line which characterized in that includes:
the acquisition module is configured to acquire two-phase voltage, two-phase current, two-phase active power and two-phase reactive power of the distribution transformer;
the first calculation module is configured to calculate a two-phase power angle of a certain collection point according to two-phase active power and two-phase reactive power of the distribution transformer, so that a two-phase power angle difference to the certain collection point is obtained;
the second calculation module is configured to calculate a converted two-phase power angle difference of a certain collection point according to the two-phase current and the two-phase power angle difference of the distribution transformer, so that a converted two-phase power angle difference sequence formed by the collection points is obtained, wherein an expression for calculating the converted two-phase power angle difference of the certain collection point is as follows: delta thetaZ＝IA*IA-IC*IC*Δθ，
In the formula,. DELTA.theta.ZFor converting the power angle difference of two phases, IA、ICRespectively an A-phase current and a C-phase current, wherein delta theta is the difference value of the A-phase power angle and the C-phase power angle;
the third calculation module is configured to calculate a converted two-phase active power difference of a certain collection point according to the two-phase voltage, the two-phase current, the two-phase active power and the two-phase power angle difference of the distribution transformer, so that a converted two-phase active power difference sequence formed by the collection points is formed, wherein an expression for calculating the converted two-phase active power difference of the certain collection point is as follows: delta PZ＝PC-Δθ*PAZ，
In the formula,. DELTA.PZFor converting two-phase active power difference, PCIs C-phase active power, PAZConverting the active power of the A phase;
and the comparison module is configured to perform linear fitting on the converted two-phase active power difference sequence and the converted two-phase power angle difference sequence to obtain a slope value, and determine the capacity corresponding to a certain item value in the standard sequence closest to the slope value as the check rated capacity of the distribution transformer, wherein the slope value is the ratio of the converted two-phase power angle difference sequence to the converted two-phase active power difference sequence.
5. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any of claims 1 to 3.
6. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of any one of claims 1 to 3.
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