CN112067930B - Method and device for judging overload type of distribution transformer, medium and terminal equipment - Google Patents

Method and device for judging overload type of distribution transformer, medium and terminal equipment Download PDF

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CN112067930B
CN112067930B CN202010960412.5A CN202010960412A CN112067930B CN 112067930 B CN112067930 B CN 112067930B CN 202010960412 A CN202010960412 A CN 202010960412A CN 112067930 B CN112067930 B CN 112067930B
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overload
distribution transformer
phase
limit value
multiple limit
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CN112067930A (en
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金杨
汪进锋
刘文晖
陈鹏
黄杨珏
姚瑶
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract

The embodiment of the invention relates to a method, a device, a medium and a terminal device for judging overload types of a distribution transformer, wherein overload operation curve graphs of single phase, two phases and three phases of the distribution transformer are obtained through the three-phase overload average load coefficient, the three-phase unbalance degree, the single-phase overload multiple limit value and the two-phase overload multiple limit value of the distribution transformer, the overload types are selected in the overload operation curve graphs according to the overload coefficient of the distribution transformer and the operation time of the distribution transformer to carry out overload control on the distribution transformer, the problem that the distribution transformer is subjected to overload control according to the three-phase unbalance degree directly to cause high-temperature bubble generation of hot spots of the overload phases of the single phase or the two phases and even cause the distribution transformer to be burnt is solved, the problem that the existing control mode of overload on the distribution transformer fails in the condition of single-phase or two-phase overload of the distribution transformer is solved, the temperature of the hot spot of the overload phase is high, and the distribution transformer generates bubbles and even burns out the distribution transformer.

Description

Method and device for judging overload type of distribution transformer, medium and terminal equipment
Technical Field
The invention relates to the technical field of distribution transformers, in particular to a method, a device, a medium and terminal equipment for judging overload types of distribution transformers.
Background
In the power system, whether the distribution transformer is overloaded or not is managed and controlled according to the load condition born by the distribution transformer when the distribution transformer normally operates, so that the service life of the distribution transformer and the operation safety of the power system are ensured.
At present, under the condition of normal operation of a distribution transformer, whether the distribution transformer is overloaded or not is judged by adopting three-phase imbalance obtained by three-phase load stress of the transformer, and a power system judges to implement safety control on the distribution transformer according to overload of the distribution transformer. However, at present, overload determination is performed on a distribution transformer according to three-phase imbalance, in the actual operation of the distribution transformer, the conditions of single-phase overload and two-phase overload of the distribution transformer exist, if only the three-phase overload of the distribution transformer is managed and controlled, the neglected condition is that the three-phase load of the transformer does not exceed the determination standard in the working process of the distribution transformer, but the maximum phase load coefficient of current in the single-phase overload or the two-phase overload of the distribution transformer exceeds the standard value, and in the condition, the temperature of a single-phase hot spot is too high, so that the distribution transformer can generate bubbles and even be burnt.
Disclosure of Invention
The embodiment of the invention provides a method, a device, a medium and terminal equipment for judging overload types of a distribution transformer, which are used for solving the technical problems that the overload control is carried out on the distribution transformer according to three-phase unbalance in the prior art, but the control fails under the condition that the distribution transformer is overloaded in single phase or two phases, so that the temperature of an overload phase hot spot is high, and the distribution transformer generates bubbles and even is burnt.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a method for judging overload types of distribution transformers comprises the following steps:
s1, acquiring a three-phase overload average load coefficient and a three-phase unbalance degree of a distribution transformer to obtain a single-phase overload multiple limit value and a two-phase overload multiple limit value of the distribution transformer;
s2, obtaining an overload operation curve graph of the distribution transformer according to the single-phase overload multiple limit value, the two-phase overload multiple limit value, the three-phase unbalance and a hot spot temperature formula;
s3, selecting an overload type of overload control of the distribution transformer from the overload operation curve graph according to the overload coefficient of the distribution transformer and the operation time of the distribution transformer;
wherein the overload types include single-phase overload, two-phase overload, and three-phase overload; the hot spot temperature formula is:
Figure GDA0003148215340000021
in the formula, thetah(t) is the hot spot temperature of the distribution transformer, θaThe ambient temperature, Δ θ, at which the distribution transformer is locatedoiFor the top oil temperature rise, Delta theta, of the initial state of the distribution transformerhiIs the temperature difference of the distribution transformer initial state hot spot to the top layer oil, delta thetaorFor the top oil temperature rise, Hg, under the total loss of the distribution transformerτThe temperature difference of a hot point to top layer oil of the distribution transformer under rated current, R is the load loss/no-load loss of the distribution transformer, kAIs the overload multiple limit value, x is the top layer oil index of the distribution transformer, y is the winding index of the distribution transformer, epsilon is the three-phase unbalance of the distribution transformer, f1(t) is a time function reflecting the rise of the temperature of the top oil, f2(t) is a time function reflecting the change in the temperature difference of the hot spot versus the top oil.
Preferably, the method for judging the overload type of the distribution transformer further comprises an overload multiple limit value formula for calculating the single-phase overload multiple limit value and the two-phase overload multiple limit value; if the single-phase overload multiple limit value is calculated, the corresponding formula of the overload multiple limit value is as follows:
Figure GDA0003148215340000022
if the two-phase overload multiple limit value is calculated, the corresponding formula of the overload multiple limit value is as follows:
Figure GDA0003148215340000023
in the formula, kAThe average load factor is the overload multiple limit value, epsilon is the three-phase unbalance degree of the distribution transformer, and K is the three-phase overload average load factor of the distribution transformer.
Preferably, the method for determining the overload type of the distribution transformer further includes: according to the overload operation curve graph, the single-phase overload safe operation area of the distribution transformer is smaller than the two-phase overload safe operation area of the distribution transformer, and the two-phase overload safe operation area of the distribution transformer is smaller than the three-phase overload safe operation area of the distribution transformer.
Preferably, the three-phase unbalance degree of the distribution transformer is 0-0.15.
The invention also provides a device for judging the overload type of the distribution transformer, which comprises an overload multiple obtaining module, a curve drawing module and a judging module;
the overload multiple acquisition module is used for acquiring the three-phase overload average load coefficient and the three-phase unbalance degree of the distribution transformer to obtain a single-phase overload multiple limit value and a two-phase overload multiple limit value of the distribution transformer;
the curve drawing module is used for obtaining an overload operation curve chart of the distribution transformer according to the single-phase overload multiple limit value, the two-phase overload multiple limit value, the three-phase unbalance degree and a hot spot temperature formula;
the judging module is used for selecting the overload type of overload control of the distribution transformer from the overload operation curve graph according to the overload coefficient of the distribution transformer and the operation time of the distribution transformer;
wherein the overload types include single-phase overload, two-phase overload, and three-phase overload; the hot spot temperature formula is:
Figure GDA0003148215340000031
in the formula, thetah(t) is the hot spot temperature of the distribution transformer, θaThe ambient temperature, Δ θ, at which the distribution transformer is locatedoiFor the top oil temperature rise, Delta theta, of the initial state of the distribution transformerhiIs the temperature difference of the distribution transformer initial state hot spot to the top layer oil, delta thetaorFor the top oil temperature rise, Hg, under the total loss of the distribution transformerτFor distribution transformer, the temperature difference of the top layer oil from the hot point under rated current, R is distributionLoad loss/no-load loss k of an electrical transformerAIs the overload multiple limit, x is the top oil index of the distribution transformer, y is the winding index of the distribution transformer, f1(t) is a time function reflecting the rise of the temperature of the top oil, f2(t) is a time function reflecting the change in the temperature difference of the hot spot versus the top oil.
Preferably, the device for judging the overload type of the distribution transformer further comprises a calculation submodule arranged on the overload multiple acquisition module, wherein the calculation submodule is used for calculating an overload multiple limit value formula of the single-phase overload multiple limit value and the two-phase overload multiple limit value; if the single-phase overload multiple limit value is calculated, the corresponding formula of the overload multiple limit value is as follows:
Figure GDA0003148215340000032
if the two-phase overload multiple limit value is calculated, the corresponding formula of the overload multiple limit value is as follows:
Figure GDA0003148215340000041
in the formula, kAThe average load factor is the overload multiple limit value, epsilon is the three-phase unbalance degree of the distribution transformer, and K is the three-phase overload average load factor of the distribution transformer.
Preferably, the judging module is further configured to determine, according to the overload operation graph, that a single-phase overload safe operation area of the distribution transformer is smaller than a two-phase overload safe operation area of the distribution transformer, and the two-phase overload safe operation area of the distribution transformer is smaller than a three-phase overload safe operation area of the distribution transformer.
The present invention also provides a computer-readable storage medium for storing computer instructions, which, when run on a computer, cause the computer to execute the above method for determining an overload type of a distribution transformer.
The invention also provides terminal equipment, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
and the processor is used for executing the method for judging the overload type of the distribution transformer according to the instructions in the program codes.
According to the technical scheme, the embodiment of the invention has the following advantages: the method, the device, the medium and the terminal equipment for judging the overload type of the distribution transformer obtain overload operation graphs of single phase, two phases and three phases of the distribution transformer through the three-phase overload average load coefficient, the three-phase unbalance degree, the single-phase overload multiple limit value and the two-phase overload multiple limit value of the distribution transformer, select the overload type in the overload operation graphs according to the overload coefficient of the distribution transformer and the operation time of the distribution transformer to carry out overload control on the distribution transformer, avoid high-yield generation bubbles of temperature of hot spots of the single phase or two phases of the overload phase caused by directly adopting the three-phase unbalance degree to carry out overload control on the distribution transformer, even avoid the burning of the distribution transformer, solve the problem that the existing distribution transformer carries out overload control according to the three-phase unbalance, but the control mode can fail to control under the condition of single-phase or two-phase overload of the distribution transformer, so that the temperature of the hot spots of the overload phase is high, the bubble generation of the distribution transformer even causes the technical problem that the distribution transformer is burnt.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a method for determining an overload type of a distribution transformer according to an embodiment of the present invention.
Fig. 2a is a single-phase overload operation curve diagram of the method for determining the overload type of the distribution transformer according to the embodiment of the present invention.
Fig. 2b is a graph illustrating overload operation of two phases in the method for determining overload type of distribution transformer according to the embodiment of the present invention.
Fig. 2c is a three-phase overload operation curve diagram of the method for determining the overload type of the distribution transformer according to the embodiment of the present invention.
Fig. 3 is a block diagram of an apparatus for determining an overload type of a distribution transformer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below 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.
At present, overload judgment of a distribution transformer is based on that the distribution transformer uses low-voltage-side rated phase current as a reference value in a normal operation mode, the duration that the arithmetic mean value of three-phase current exceeds the reference value by 80% or 100% within 1 day is counted, and if the dry change duration exceeds 1 hour and the oil change duration exceeds 2 hours, the number of times is counted. And if the 10 times of accumulation occur within 1 natural month, judging that the distribution transformer is overloaded or overloaded. Or if the arithmetic mean value of the three-phase current of the distribution transformer measured for the first time exceeds the reference value by 80% or 100%, the arithmetic mean value of the three-phase current of the distribution transformer needs to be measured for two consecutive days, and if the arithmetic mean value of the three-phase current of three days exceeds the reference value by 80% or 100%, the heavy load or overload of the distribution transformer is judged.
Therefore, the embodiment of the application provides a method, a device, a medium and a terminal device for judging overload types of a distribution transformer, which overload type is selected to carry out overload control on the distribution transformer according to overload coefficients of the distribution transformer and running time of the distribution transformer by analyzing single-phase, two-phase and three-phase overload running of the distribution transformer, and the method is used for solving the technical problems that the existing distribution transformer is subjected to overload control according to three-phase unbalance, but the control is invalid under the condition that the distribution transformer is subjected to single-phase or two-phase overload, so that the temperature of an overload phase hot point is high, and the distribution transformer generates bubbles and even is burnt.
The first embodiment is as follows:
fig. 1 is a flowchart illustrating steps of a method for determining an overload type of a distribution transformer according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for determining an overload type of a distribution transformer, which is applied to overload control of the distribution transformer, and includes the following steps:
s1, acquiring a three-phase overload average load coefficient and a three-phase unbalance degree of a distribution transformer to obtain a single-phase overload multiple limit value and a two-phase overload multiple limit value of the distribution transformer;
s2, obtaining an overload operation curve graph of the distribution transformer according to the single-phase overload multiple limit value, the two-phase overload multiple limit value, the three-phase unbalance and the hot spot temperature formula;
s3, selecting an overload type of overload control of the distribution transformer from an overload operation curve graph according to the overload coefficient of the distribution transformer and the operation time of the distribution transformer;
the overload types comprise single-phase overload, two-phase overload and three-phase overload; the hot spot temperature formula is:
Figure GDA0003148215340000061
in the formula, thetah(t) is the hot spot temperature of the distribution transformer, θaThe ambient temperature, Δ θ, at which the distribution transformer is locatedoiFor the top oil temperature rise, Delta theta, of the initial state of the distribution transformerhiIs the temperature difference of the distribution transformer initial state hot spot to the top layer oil, delta thetaorFor the top oil temperature rise, Hg, under the total loss of the distribution transformerτThe temperature difference of a hot point to top layer oil of the distribution transformer under rated current is adopted, and R is the load loss/no-load of the distribution transformerLoss, kAIs the overload multiple limit, x is the top oil index of the distribution transformer, y is the winding index of the distribution transformer, f1(t) is a time function reflecting the rise of the temperature of the top oil, f2(t) is a time function reflecting the change in the temperature difference of the hot spot versus the top oil.
In step S1 of the embodiment of the present invention, the overload multiple limit values of the single phase and the two phases of the distribution transformer are calculated according to the three-phase overload average load factor and the three-phase imbalance of the distribution transformer during the normal operation.
The formula for calculating the three-phase imbalance of the distribution transformer is ∈ ═ E — F)/E, where E is the maximum current of the three phases of the distribution transformer, and F is the minimum current of the three phases of the distribution transformer.
In step S2 of the embodiment of the present invention, the hot spot temperature of each phase of each load factor is calculated according to the overload multiple limit, the three-phase imbalance and the operation time of the distribution transformer through a hot spot temperature formula, and an overload operation curve is drawn according to the change of the load factor and the operation time in the hot spot temperature formula.
It should be noted that, in the overload operation graph, the overload operation graph of the load factor of the single phase, the two phase and the three phase of the distribution transformer and the operation time is provided. In this embodiment, the distribution transformer has a hot spot temperature of less than 140 degrees. The three-phase unbalance degree of the distribution transformer is preferably 0-0.15.
Fig. 2a, fig. 2b and fig. 2c are graphs illustrating single-phase, two-phase and three-phase overload operation curves of the method for determining the overload type of the distribution transformer according to the embodiment of the present invention.
In step S3 of the embodiment of the present invention, the overload type of the distribution transformer overload control is selected from the overload operation graphs of single phase, two phase and three phase according to the overload factor of the distribution transformer and the operation time of the distribution transformer. In this embodiment, as shown in fig. 2c, the single-phase overload safe operation area of the distribution transformer is smaller than the two-phase overload safe operation area of the distribution transformer, and the two-phase overload safe operation area of the distribution transformer is smaller than the three-phase overload safe operation area of the distribution transformer.
It should be noted that the hot spot temperature of the three-phase overload of the distribution transformer does not reach 140 ℃, but the single-phase overload or the two-phase overload seriously causes the hot spot temperature of the transformer to exceed 140 ℃. As shown in fig. 2a, 2b and 2c, the distribution transformer has a more serious three-phase imbalance under the condition that the single-phase overload and the two-phase overload meet the operation requirement, and the safe operation area of the single-phase overload and the two-phase overload is smaller, that is, the overload operation time of the distribution transformer is shorter.
The method for judging the overload type of the distribution transformer obtains the overload operation curve graphs of single phase, two phases and three phases of the distribution transformer through the three-phase overload average load coefficient, the three-phase unbalance degree, the single-phase overload multiple limit value and the two-phase overload multiple limit value of the distribution transformer, selects the overload type in the overload operation curve graphs according to the overload coefficient of the distribution transformer and the operation time of the distribution transformer to carry out overload control on the distribution transformer, avoids high-yield bubble generation of the temperature of the hot point of the overload phase of the single phase or the two phases caused by directly adopting the three-phase unbalance degree to carry out overload control on the distribution transformer, even avoids the burning of the distribution transformer, solves the problem that the existing method carries out overload control on the distribution transformer according to the three-phase unbalance, but the control mode can fail under the condition that the distribution transformer is overloaded under the single phase or the two-phase overload condition, so that the temperature of the hot point of the overload phase is high, the bubble generation of the distribution transformer even causes the technical problem that the distribution transformer is burnt.
In an embodiment of the present invention, the method for determining the overload type of the distribution transformer further includes an overload multiple limit value formula for calculating a single-phase overload multiple limit value and a two-phase overload multiple limit value; if the single-phase overload multiple limit value is calculated, the corresponding overload multiple limit value formula is as follows:
Figure GDA0003148215340000081
if the two-phase overload multiple limit value is calculated, the corresponding formula of the overload multiple limit value is as follows:
Figure GDA0003148215340000082
in the formula, kAThe average load factor is the overload multiple limit value, epsilon is the three-phase unbalance degree of the distribution transformer, and K is the three-phase overload average load factor of the distribution transformer.
It should be noted that, if the three-phase overload average load factor of the distribution transformer is K, the three phases of the distribution transformer are respectively an a phase, a B phase, and a C phase, and the three-phase load factors are respectively: k is a radical ofA、kB、kCWherein, the phase A current is the largest, the phase C current is the smallest, comprising:
Figure GDA0003148215340000083
Figure GDA0003148215340000084
the formula (1) is as follows: k is a radical ofC＝(1-ε)kAThe substitution into the formula (2) is:
Figure GDA0003148215340000085
the conditions of the lower limit value of the distribution transformer in single-phase overload are as follows: k is a radical ofB＝kC＜kASubstituting the formula (3) to obtain the limit value of the single-phase overload multiple:
Figure GDA0003148215340000086
the lower limit value condition of the distribution transformer in two-phase overload is as follows: k is a radical ofC＜kA＝kBSubstituting the formula (3) to obtain the two-phase overload multiple limit value:
Figure GDA0003148215340000087
example two:
fig. 3 is a block diagram of an apparatus for determining an overload type of a distribution transformer according to an embodiment of the present invention.
As shown in fig. 3, an embodiment of the present invention further provides a device for determining an overload type of a distribution transformer, including an overload multiple obtaining module 10, a curve drawing module 20, and a determining module 30;
the overload multiple acquiring module 10 is configured to acquire an average three-phase overload load coefficient and an unbalance degree of a distribution transformer, and obtain a single-phase overload multiple limit value and a two-phase overload multiple limit value of the distribution transformer;
the curve drawing module 20 is used for obtaining an overload operation curve chart of the distribution transformer according to the single-phase overload multiple limit value, the two-phase overload multiple limit value, the three-phase unbalance degree and the hot spot temperature formula;
the judging module 30 is configured to select an overload type of overload control of the distribution transformer from an overload operation curve according to an overload coefficient of the distribution transformer and an operation time of the distribution transformer;
the overload types comprise single-phase overload, two-phase overload and three-phase overload; the hot spot temperature formula is:
Figure GDA0003148215340000091
in the formula, thetah(t) is the hot spot temperature of the distribution transformer, θaThe ambient temperature, Δ θ, at which the distribution transformer is locatedoiFor the top oil temperature rise, Delta theta, of the initial state of the distribution transformerhiIs the temperature difference of the distribution transformer initial state hot spot to the top layer oil, delta thetaorFor the top oil temperature rise, Hg, under the total loss of the distribution transformerτThe temperature difference of a hot point to top layer oil of the distribution transformer under rated current, R is the load loss/no-load loss of the distribution transformer, kAIs the overload multiple limit, x is the top oil index of the distribution transformer, y is the winding index of the distribution transformer, f1(t) is the time when the temperature rise of the top layer oil is reflectedFunction between f2(t) is a time function reflecting the change in the temperature difference of the hot spot versus the top oil.
In the embodiment of the present invention, the apparatus for determining the overload type of the distribution transformer further includes a calculation submodule disposed on the overload multiple obtaining module 10, wherein the calculation submodule is configured to calculate an overload multiple limit value formula of the single-phase overload multiple limit value and the two-phase overload multiple limit value; if the single-phase overload multiple limit value is calculated, the formula of the corresponding overload multiple limit value is as follows:
Figure GDA0003148215340000092
if the two-phase overload multiple limit value is calculated, the corresponding overload multiple limit value formula is as follows:
Figure GDA0003148215340000093
in the formula, kAThe average load factor is the overload multiple limit value, epsilon is the three-phase unbalance degree of the distribution transformer, and K is the three-phase overload average load factor of the distribution transformer.
In an embodiment of the present invention, the determining module 40 is further configured to determine, according to the overload operation graph, that the single-phase overload safe operation area of the distribution transformer is smaller than the two-phase overload safe operation area of the distribution transformer, and the two-phase overload safe operation area of the distribution transformer is smaller than the three-phase overload safe operation area of the distribution transformer.
In the embodiment of the invention, the three-phase unbalance degree of the distribution transformer is 0-0.15.
It should be noted that the modules in the apparatus according to the second embodiment correspond to the steps in the method according to the first embodiment, the steps in the method according to the first embodiment have been described in detail in the first embodiment, and the contents of the modules in the apparatus are not described in detail in the second embodiment.
Example three:
the embodiment of the invention provides a computer-readable storage medium, which is used for storing computer instructions, and when the computer-readable storage medium runs on a computer, the computer is enabled to execute the method for judging the overload type of the distribution transformer.
Example four:
the embodiment of the invention provides terminal equipment, which comprises a processor and a memory;
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the judging method of the overload type of the distribution transformer according to instructions in the program codes.
It should be noted that the processor is configured to execute the steps in the above-mentioned embodiment of the method for determining the overload type of the distribution transformer according to the instructions in the program code. Alternatively, the processor, when executing the computer program, implements the functions of each module/unit in each system/apparatus embodiment described above.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of a computer program in a terminal device.
The terminal device may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the terminal device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the terminal device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; 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 (10)

1. A method for judging overload types of distribution transformers is characterized by comprising the following steps:
s1, acquiring a three-phase overload average load coefficient and a three-phase unbalance degree of a distribution transformer to obtain a single-phase overload multiple limit value and a two-phase overload multiple limit value of the distribution transformer;
s2, obtaining an overload operation curve graph of the distribution transformer according to the single-phase overload multiple limit value, the two-phase overload multiple limit value, the three-phase unbalance and a hot spot temperature formula;
s3, selecting an overload type of overload control of the distribution transformer from the overload operation curve graph according to the overload coefficient of the distribution transformer and the operation time of the distribution transformer;
wherein the overload types include single-phase overload, two-phase overload, and three-phase overload; the hot spot temperature formula is:
Figure FDA0003148215330000011
in the formula, thetah(t) is the hot spot temperature of the distribution transformer, θaThe ambient temperature, Δ θ, at which the distribution transformer is locatedoiFor the top oil temperature rise, Delta theta, of the initial state of the distribution transformerhiIs the temperature difference of the distribution transformer initial state hot spot to the top layer oil, delta thetaorFor the top oil temperature rise, Hg, under the total loss of the distribution transformerτThe temperature difference of a hot point to top layer oil of the distribution transformer under rated current, R is the load loss/no-load loss of the distribution transformer, kAIs the overload multiple limit, x is the top oil index of the distribution transformer, y is the winding index of the distribution transformer, f1(t) is a time function reflecting the rise of the temperature of the top oil, f2(t) is a time function reflecting the change in the temperature difference of the hot spot versus the top oil.
2. The method of claim 1, further comprising an overload multiple limit value formula for calculating the single phase overload multiple limit value and the two phase overload multiple limit value; if the single-phase overload multiple limit value is calculated, the corresponding formula of the overload multiple limit value is as follows:
Figure FDA0003148215330000012
if the two-phase overload multiple limit value is calculated, the corresponding formula of the overload multiple limit value is as follows:
Figure FDA0003148215330000013
in the formula, kAThe average load factor is the overload multiple limit value, epsilon is the three-phase unbalance degree of the distribution transformer, and K is the three-phase overload average load factor of the distribution transformer.
3. The method of determining an overload type of a distribution transformer according to claim 1, further comprising: according to the overload operation curve graph, the single-phase overload safe operation area of the distribution transformer is smaller than the two-phase overload safe operation area of the distribution transformer, and the two-phase overload safe operation area of the distribution transformer is smaller than the three-phase overload safe operation area of the distribution transformer.
4. The method for determining the overload type of the distribution transformer as claimed in claim 1, wherein the three-phase unbalance of the distribution transformer is 0-0.15.
5. The device for judging the overload type of the distribution transformer is characterized by comprising an overload multiple obtaining module, a curve drawing module and a judging module;
the overload multiple acquisition module is used for acquiring the three-phase overload average load coefficient and the three-phase unbalance degree of the distribution transformer to obtain a single-phase overload multiple limit value and a two-phase overload multiple limit value of the distribution transformer;
the curve drawing module is used for obtaining an overload operation curve chart of the distribution transformer according to the single-phase overload multiple limit value, the two-phase overload multiple limit value, the three-phase unbalance degree and a hot spot temperature formula;
the judging module is used for selecting the overload type of overload control of the distribution transformer from the overload operation curve graph according to the overload coefficient of the distribution transformer and the operation time of the distribution transformer;
wherein the overload types include single-phase overload, two-phase overload, and three-phase overload; the hot spot temperature formula is:
Figure FDA0003148215330000021
in the formula, thetah(t) is the hot spot temperature of the distribution transformer, θaThe ambient temperature, Δ θ, at which the distribution transformer is locatedoiFor the top oil temperature rise, Delta theta, of the initial state of the distribution transformerhiIs the temperature difference of the distribution transformer initial state hot spot to the top layer oil, delta thetaorFor the top oil temperature rise, Hg, under the total loss of the distribution transformerτThe temperature difference of a hot point to top layer oil of the distribution transformer under rated current, R is the load loss/no-load loss of the distribution transformer, kAIs the overload multiple limit, x is the top oil index of the distribution transformer, y is the winding index of the distribution transformer, f1(t) is a time function reflecting the rise of the temperature of the top oil, f2(t) is a time function reflecting the change in the temperature difference of the hot spot versus the top oil.
6. The distribution transformer overload type judgment device according to claim 5, further comprising a calculation submodule arranged on the overload multiple obtaining module, wherein the calculation submodule is configured to calculate an overload multiple limit formula of the single-phase overload multiple limit value and the two-phase overload multiple limit value; if the single-phase overload multiple limit value is calculated, the corresponding formula of the overload multiple limit value is as follows:
Figure FDA0003148215330000031
if the two-phase overload multiple limit value is calculated, the corresponding formula of the overload multiple limit value is as follows:
Figure FDA0003148215330000032
in the formula, kAThe average load factor is the overload multiple limit value, epsilon is the three-phase unbalance degree of the distribution transformer, and K is the three-phase overload average load factor of the distribution transformer.
7. The apparatus according to claim 5, wherein the determining module is further configured to determine, according to the overload operation graph, that the single-phase overload safe operation area of the distribution transformer is smaller than the two-phase overload safe operation area of the distribution transformer, and that the two-phase overload safe operation area of the distribution transformer is smaller than the three-phase overload safe operation area of the distribution transformer.
8. The overload type judgment device for the distribution transformer according to claim 5, wherein the three-phase unbalance degree of the distribution transformer is 0-0.15.
9. A computer-readable storage medium for storing computer instructions which, when run on a computer, cause the computer to perform the method of determining the type of overload of a distribution transformer according to any one of claims 1 to 4.
10. A terminal device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the method for determining the overload type of the distribution transformer according to any one of claims 1 to 4 according to instructions in the program code.
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