CN114123253B - Method, equipment and medium for monitoring three-phase load unbalance transformer area - Google Patents
Method, equipment and medium for monitoring three-phase load unbalance transformer area Download PDFInfo
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- CN114123253B CN114123253B CN202111391358.8A CN202111391358A CN114123253B CN 114123253 B CN114123253 B CN 114123253B CN 202111391358 A CN202111391358 A CN 202111391358A CN 114123253 B CN114123253 B CN 114123253B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000009466 transformation Effects 0.000 claims abstract description 39
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 claims description 21
- 238000004590 computer program Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses a method, equipment and a medium for monitoring a three-phase load unbalance transformer area, which comprise the following steps: acquiring three-phase current data of a distribution transformer of a target transformer area and archive data of the distribution transformer; according to the archive data of the distribution transformer, carrying out data cleaning processing on the three-phase current data of the distribution transformer to obtain the cleaned three-phase current data; according to the cleaned three-phase current data, obtaining the three-phase imbalance condition of the distribution transformer at each monitoring point moment of the distribution and transformation day; and acquiring the unbalance type of the three-phase load unbalance area according to the three-phase unbalance condition of each monitoring point moment of the distribution and transformation day. The method and the device can comprehensively utilize the three-phase load unbalance degree and the distribution transformer load rate to judge the three-phase unbalance type of the transformer area, thereby improving the accuracy of the judgment result.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a method, equipment and medium for monitoring a three-phase load unbalance transformer area.
Background
With the rapid development of electric power, the transformer equipment is installed all over the country to realize effective coverage, so that great convenience is brought to the life of people. However, the problem of three-phase imbalance commonly exists in a low-voltage distribution network, so that the transformer is overloaded, and the reliable operation of the distribution network is threatened.
At present, most methods for judging three-phase load unbalance transformer areas are carried out based on three-phase load unbalance degrees, but the methods have the problems of inaccurate judgment and low precision.
Disclosure of Invention
The purpose of the invention is: the method, the equipment and the medium for monitoring the three-phase load unbalance transformer area can comprehensively utilize the three-phase load unbalance degree and the distribution transformer load rate to judge the three-phase unbalance type of the transformer area, so that the accuracy of a judgment result is improved.
In order to achieve the above object, the present invention provides a method for monitoring a three-phase unbalanced load area, including:
acquiring three-phase current data of a distribution transformer of a target transformer area and archive data of the distribution transformer; wherein the profile data of the distribution transformer comprises: monitoring points of CT transformation ratio, rated capacity, rated current and distribution transformation day of the distribution transformer;
according to the archive data of the distribution transformer, carrying out data cleaning processing on the three-phase current data of the distribution transformer to obtain the cleaned three-phase current data;
obtaining the three-phase imbalance condition of the distribution transformer at each monitoring point moment on the distribution day according to the cleaned three-phase current data;
and acquiring the unbalance type of the three-phase load unbalance area according to the three-phase unbalance condition of each monitoring point moment of the distribution and transformation day.
Further, the data cleaning processing is performed on the three-phase current data of the distribution transformer according to the archive data of the distribution transformer, so as to obtain the cleaned three-phase current data, and the data cleaning processing method includes:
calculating actual three-phase current data of the distribution transformer according to the archive data of the distribution transformer;
and cleaning the actual three-phase current data of the distribution transformer to obtain the cleaned three-phase current data.
Further, the actual three-phase current data of the distribution transformer is calculated according to the archive data of the distribution transformer, and the following calculation formula is adopted:
I_A k ＝i_a k *ct_value；
I_B k ＝i_b k *ct_value；
I_C k ＝i_c k *ct_value；
wherein, I _ A k Represents the actual A-phase current, I _ B, every 15 minutes of the distribution day k Represents the actual B-phase current, I _ C, every 15 minutes of the distribution day k Represents the actual C-phase current, i _ a, every 15 minutes of the distribution day k Shows the A-phase current, i _ b, every 15 minutes of the distribution day k Represents the B-phase current, i _ c, every 15 minutes of the distribution and transformation day k The current of C phase of every 15 minutes of the distribution and transformation day is represented, CT _ value represents the CT transformation ratio of the distribution and transformation, k represents the number of monitoring points on the distribution and transformation day, and the value range of k is as follows: k is more than or equal to 1 and less than or equal to 96.
Further, the actual three-phase current data of the distribution transformer are cleaned to obtain the cleaned three-phase current data, and the following calculation formula is specifically adopted:
l_A k ＝if(current_voltage＜I_A k )0 else I_A k ；
I_B k ＝if(current_voltage＜I_B k )0 else I_B k ；
I_C k ＝if(current_voltage＜I_C k )0 else I_C k ；
the current _ voltage represents the rated current of the distribution transformer.
Further, the obtaining of the three-phase imbalance condition of the distribution transformer at each monitoring point on the distribution day according to the cleaned three-phase current data includes:
calculating to obtain the load rate of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer according to the cleaned three-phase current data;
calculating to obtain the three-phase load unbalance degree of the distribution transformer and the lower limit of the three-phase load unbalance degree of the distribution transformer according to the load rate of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer;
and obtaining the three-phase imbalance condition of the distribution transformer at each monitoring point moment on the distribution and transformation day according to the load of the distribution transformer, the three-phase load imbalance degree of the distribution transformer and the lower limit of the three-phase load imbalance degree of the distribution transformer.
Further, the load factor of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer are obtained through calculation according to the cleaned three-phase current data, and the following calculation formula is specifically adopted:
max_value k ＝max(I_A k ，I_B k ，I_C k )；
min_value k ＝if(I_A k ＞0&&I_B k ＞I_A k )I_A k else I_B k ；
wherein max _ value k Representing the maximum current of the three phases at a certain moment of the distribution transformation, load _ rate k Representing the load rate at a certain moment of distribution, capacity representing the rated capacity of the distribution transformer, min _ value k Representing a non-zero three-phase minimum current at a certain moment of the distribution transformation.
Further, the three-phase load unbalance of the distribution transformer and the lower limit of the three-phase load unbalance of the distribution transformer are obtained through calculation according to the load rate of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer, and the following calculation formula is specifically adopted:
unbo_limit＝if(tie_line＝＝Yyn0)15％else 25％；
unbs_limit＝if(tie_line＝＝Yyn0)30％else 50％；
wherein, unb k The load unbalance degree of the three phases at a certain moment of distribution is represented, tie _ line represents a connection group, the value range is Yyn0 and Dyn11, unbo _ limit represents the lower limit of the three-phase unbalance degree of a general three-phase unbalance station area, and unbs _ limit represents the lower limit of the three-phase unbalance degree of a serious three-phase unbalance station area.
Further, the three-phase imbalance condition of the distribution transformer at each monitoring point time of the distribution and transformation day is obtained according to the load of the distribution transformer, the three-phase load imbalance degree of the distribution transformer and the lower limit of the three-phase load imbalance degree of the distribution transformer, and the following calculation formula is specifically adopted:
unb_state k ＝if(unb k ＜＝unbo_limit||load_rate k ＜＝60％)0；
else if(unb k ＜＝unbs_limit)1；
else if(load_rate k ＜＝80％)1 else 2；
wherein, unb _ state k The constant 1 indicates that the distribution transformer is unbalanced in three phases, the constant 2 indicates that the distribution transformer is unbalanced in general, and the constant 2 indicates that the distribution transformer is unbalanced in severe conditions.
The present invention also provides a computer terminal device, comprising: one or more processors; a memory coupled to the processor for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method for monitoring the three-phase load unbalance area according to any one of the above descriptions.
The present invention also provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for monitoring a three-phase load unbalance area as defined in any one of the above.
Compared with the prior art, the monitoring method, the monitoring equipment and the monitoring medium for the three-phase load unbalance transformer area have the beneficial effects that:
1. the three-phase unbalanced type of the transformer area is judged by comprehensively utilizing the three-phase load unbalanced degree and the distribution transformer load rate, so that the accuracy of a judgment result is improved.
2. Through the processing of changing the three-phase current minimum value in the three-phase load unbalance calculation formula into the three-phase current non-zero minimum value, the surge height of the three-phase load unbalance value is avoided, and the possibility that the transformer area is judged to be the unbalanced type is reduced.
Drawings
Fig. 1 is a schematic flow chart of a method for monitoring a three-phase load imbalance platform area according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
As shown in fig. 1, the method for monitoring a three-phase load unbalance transformer area provided by the present invention at least includes steps S1-S4, which include the following steps:
s1, acquiring three-phase current data of a distribution transformer of the target transformer area and archive data of the distribution transformer; wherein the profile data of the distribution transformer comprises: the CT transformation ratio, the rated capacity, the rated current and the monitoring point number of the distribution transformer day.
Specifically, three-phase current data of the distribution transformer is obtained from a metering system inside the power company, and archive data of the distribution transformer is obtained from a marketing system inside the power company.
It should be noted that, in the present application, a node is set at 15 minutes, and once three-phase current data is obtained, that is, on the day of distribution and transformation of a distribution transformer, 96 sets of three-phase current data can be obtained altogether.
And S2, according to the archive data of the distribution transformer, carrying out data cleaning processing on the three-phase current data of the distribution transformer to obtain the cleaned three-phase current data.
Specifically, the method specifically comprises the following steps: calculating actual three-phase current data of the distribution transformer according to the archive data of the distribution transformer; and cleaning the actual three-phase current data of the distribution transformer to obtain the cleaned three-phase current data.
It should be noted that, according to the archive data of the distribution transformer, the actual three-phase current data of the distribution transformer is calculated, specifically using the following calculation formula:
I_A k ＝i_a k *ct_value；
I_B k ＝i_b k *ct_value：
I_C k ＝i_c k *ct_value；
wherein, I _ A k Represents the actual A-phase current, I _ B, every 15 minutes of the distribution day k Represents the actual B-phase current, I _ C, every 15 minutes of the distribution day k Represents the actual C-phase current, i _ a, every 15 minutes of the distribution day k Shows the A-phase current, i _ b, every 15 minutes of the distribution day k Represents the B-phase current, i _ c, every 15 minutes of the distribution and transformation day k The current of C phase of every 15 minutes of the distribution and transformation day is represented, CT _ value represents the CT transformation ratio of the distribution and transformation, k represents the number of monitoring points on the distribution and transformation day, and the value range of k is as follows: k is more than or equal to 1 and less than or equal to 96.
It should be noted that, the actual three-phase current data of the distribution transformer is cleaned to obtain the cleaned three-phase current data, and the following calculation formula is specifically adopted:
I_A k ＝if(current_voltage＜I_A k )0 else I_A k ；
I_B k ＝if(current_voltage＜I_B k )0 else I_B k ；
I_C k ＝if(current_voltage＜I_C k )0 else I_C k ；
the current _ voltage represents the rated current of the distribution transformer.
S3, obtaining the three-phase imbalance condition of the distribution transformer at each monitoring point moment on the distribution and transformation day according to the cleaned three-phase current data;
specifically, the method specifically comprises the following steps: calculating to obtain the load rate of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer according to the cleaned three-phase current data;
calculating to obtain the three-phase load unbalance degree of the distribution transformer and the lower limit of the three-phase load unbalance degree of the distribution transformer according to the load rate of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer;
and obtaining the three-phase imbalance condition of the distribution transformer at each monitoring point moment on the distribution and transformation day according to the load of the distribution transformer, the three-phase load imbalance degree of the distribution transformer and the lower limit of the three-phase load imbalance degree of the distribution transformer.
It should be noted that, according to the cleaned three-phase current data, the load factor of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer are obtained through calculation, and specifically, the following calculation formula is adopted:
max_value k ＝max(I_A k ，I_B k ，I_C k )；
min_value k ＝if(I_A k ＞0&&I_B k ＞I_A k )I_A k else I_B k ；
wherein max _ value k Representing the maximum current of the three phases at a certain moment of the distribution transformation, load _ rate k Representing the load rate at a certain moment of distribution, capacity representing the rated capacity of the distribution transformer, min _ value k Representing a non-zero three-phase minimum current at a certain moment of the distribution transformation.
It should be noted that, the three-phase load unbalance of the distribution transformer and the lower limit of the three-phase load unbalance of the distribution transformer are obtained by calculation according to the load factor of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer, and the following calculation formula is specifically adopted:
unbo_limit＝if(tie_line＝＝Yyn0)15％else25％；
unbs_limit＝if(tie_line＝＝Yyn0)30％else50％；
wherein, unb k The load unbalance degree of the three phases at a certain moment of distribution is represented, tie _ line represents a connection group, the value range is Yyn0 and Dyn11, unbo _ limit represents the lower limit of the three-phase unbalance degree of a general three-phase unbalance station area, and unbs _ limit represents the lower limit of the three-phase unbalance degree of a serious three-phase unbalance station area.
It should be noted that, the three-phase imbalance condition of the distribution transformer at each monitoring point time of the distribution day is obtained according to the load of the distribution transformer, the three-phase load imbalance degree of the distribution transformer, and the lower limit of the three-phase load imbalance degree of the distribution transformer, and specifically the following calculation formula is adopted:
unb_state k ＝if(unb k ＜＝unbo_limit||load_rate k ＜＝60％)0；
else if(unb k ＜＝unbs_limit)1；
else if(load_rate k ＜＝80％)1 else 2；
wherein, unb _ state k The constant 1 indicates that the distribution transformer is unbalanced in three phases, the constant 2 indicates that the distribution transformer is unbalanced in general, and the constant 2 indicates that the distribution transformer is unbalanced in severe conditions.
And S4, obtaining the unbalance type of the three-phase load unbalance area according to the three-phase unbalance condition of each monitoring point moment of the distribution and transformation day.
Specifically, the imbalance condition of each monitoring point moment on the distribution and transformation day is counted, if the serious imbalance condition occurs for 5 times continuously, the type of the transformer area is determined to be serious three-phase imbalance, if the general three-phase imbalance condition occurs for 5 times continuously, the type of the transformer area is determined to be general three-phase imbalance, and if the two conditions do not occur, the type of the transformer area is determined to be normal.
Compared with the prior art, the monitoring method of the three-phase load unbalance area provided by the invention has the beneficial effects that:
1. the three-phase unbalance type of the transformer area is judged by comprehensively utilizing the three-phase load unbalance degree and the distribution transformer load rate, so that the accuracy of the judgment result is improved.
2. The three-phase current minimum value in the three-phase load unbalance calculation formula is changed into the three-phase current non-zero minimum value, so that the violent increase of the three-phase load unbalance value is avoided, and the possibility that the transformer area is judged to be the unbalanced type is reduced.
The present invention also provides a computer terminal device, comprising: one or more processors; a memory coupled to the processor for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method for monitoring the three-phase load unbalance area according to any one of the above descriptions.
It should be noted that 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 application-specific programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., the general-purpose processor may be a microprocessor, or the processor may be any conventional processor, the processor is a control center of the terminal device, and various interfaces and lines are used to connect various parts of the terminal device.
The memory mainly includes a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like, and the data storage area may store related data and the like. In addition, the memory may be a high speed random access memory, may also be a non-volatile memory, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash card (FlashCard), and the like, or may also be other volatile solid state memory devices.
It should be noted that the terminal device may include, but is not limited to, a processor and a memory, and those skilled in the art will understand that the terminal device is only an example and does not constitute a limitation of the terminal device, and may include more or less components, or combine some components, or different components.
The present invention also provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for monitoring a three-phase load unbalance area as defined in any one of the above.
It should be noted that the computer program may be divided into one or more modules/units (e.g., computer program), and the one or more modules/units are stored in the memory and executed by the processor to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the terminal device.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (3)
1. A monitoring method for a three-phase load unbalance transformer area is characterized by comprising the following steps:
acquiring three-phase current data of a distribution transformer of a target transformer area and archive data of the distribution transformer; wherein the profile data of the distribution transformer comprises: monitoring points of CT transformation ratio, rated capacity, rated current and distribution transformation day of the distribution transformer;
according to the archive data of the distribution transformer, carrying out data cleaning processing on the three-phase current data of the distribution transformer to obtain the cleaned three-phase current data;
obtaining the three-phase imbalance condition of the distribution transformer at each monitoring point moment on the distribution day according to the cleaned three-phase current data;
obtaining the unbalance type of the three-phase load unbalance area according to the three-phase unbalance condition of each monitoring point moment of the distribution and transformation day; wherein,
according to distribution transformer's archival data, carry out data cleaning to distribution transformer's three-phase current data, obtain the three-phase current data after the washing, include:
calculating actual three-phase current data of the distribution transformer according to the archive data of the distribution transformer;
cleaning the actual three-phase current data of the distribution transformer to obtain the cleaned three-phase current data;
and calculating actual three-phase current data of the distribution transformer according to the archive data of the distribution transformer by adopting the following calculation formula:
I_A k ＝i_a k *ct_value
I_B k ＝i_b k *ct_value
I_C k ＝i_c k *ct_value
wherein, I _ A k Represents the actual A-phase current, I _ B, every 15 minutes of the distribution day k Represents the actual B-phase current, I _ C, every 15 minutes of the distribution day k Represents the actual C-phase current, i _ a, every 15 minutes of the distribution day k Shows the A-phase current, i _ b, every 15 minutes of the distribution day k Represents the B-phase current, i _ c, every 15 minutes of the distribution and transformation day k The current of C phase of every 15 minutes of the distribution and transformation day is represented, CT _ value represents the CT transformation ratio of the distribution and transformation, k represents the number of monitoring points on the distribution and transformation day, and the value range of k is as follows: k is more than or equal to 1 and less than or equal to 96;
the actual three-phase current data of the distribution transformer are cleaned to obtain the cleaned three-phase current data, and the following calculation formula is specifically adopted:
I_A k ＝if(current_voltage＜I_A k )0 else I_A k
I_B k ＝if(current_voltage＜I_B k )0 else I_B k
I_C k ＝if(current_voltage＜I_C k )0 else I_C k
wherein current _ voltage represents the rated current of the distribution transformer;
the step of obtaining the three-phase imbalance condition of the distribution transformer at each monitoring point moment on the distribution day according to the cleaned three-phase current data comprises the following steps:
calculating to obtain the load rate of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer according to the cleaned three-phase current data;
calculating to obtain the three-phase load unbalance degree of the distribution transformer and the lower limit of the three-phase load unbalance degree of the distribution transformer according to the load rate of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer;
according to the load of the distribution transformer, the three-phase load unbalance degree of the distribution transformer and the three-phase load unbalance degree lower limit of the distribution transformer, obtaining the three-phase unbalance condition of the distribution transformer at each monitoring point moment of a distribution day;
according to the cleaned three-phase current data, calculating to obtain the load factor of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer, and specifically adopting the following calculation formula:
max_value k ＝max(I_A k ，I_B k ，I_C k )
min_value k ＝if(I_A k ＞0&&I_B k ＞I_A k )I_A k else I_B k
wherein max _ value k Representing the maximum current of the three phases at a certain moment of the distribution transformation, load _ rate k Representing the load rate at a certain moment of distribution, capacity representing the rated capacity of the distribution transformer, min _ value k Representing the non-zero three-phase minimum current at a certain moment of distribution and transformation;
and calculating to obtain the three-phase load unbalance degree of the distribution transformer and the lower limit of the three-phase load unbalance degree of the distribution transformer according to the load rate of the distribution transformer and the non-zero minimum value of the three-phase current of the distribution transformer, wherein the following calculation formula is specifically adopted:
unbo_limit＝if(tie_line＝＝Yyn0)15％else 25％
unbs_limit＝if(tie_line＝＝Yyn0)30％else 50％
wherein, unb k The load unbalance degree of the three phases at a certain moment of distribution and transformation is represented, tie _ line represents a connection group, the value range is Yyn0 and Dyn11, unbo _ limit represents the lower limit of the three-phase unbalance degree of a general three-phase unbalance station area, and unbs _ limit represents the lower limit of the three-phase unbalance degree of a serious three-phase unbalance station area;
according to the load of the distribution transformer, the three-phase load unbalance degree of the distribution transformer and the three-phase load unbalance degree lower limit of the distribution transformer, the three-phase unbalance condition of the distribution transformer at each monitoring point moment on a distribution and transformation day is obtained, and the following calculation formula is specifically adopted:
unb_state k ＝if(unb k ＜＝unbo_limit||load_rate k ＜＝60％)0
else if(unb k ＜＝unbs_limit)1
else if(load_rate k ＜＝80％)1 else 2
wherein, unb _ state k The constant 1 indicates that the distribution transformer is unbalanced in three phases, the constant 2 indicates that the distribution transformer is unbalanced in general, and the constant 2 indicates that the distribution transformer is unbalanced in severe conditions.
2. A computer terminal device, comprising: one or more processors; a memory coupled to the processor for storing one or more programs; when executed by the one or more processors, cause the one or more processors to implement the method of monitoring a three-phase load imbalance landing zone of claim 1.
3. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method of monitoring a three-phase load unbalance landing zone according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111391358.8A CN114123253B (en) | 2021-11-22 | 2021-11-22 | Method, equipment and medium for monitoring three-phase load unbalance transformer area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111391358.8A CN114123253B (en) | 2021-11-22 | 2021-11-22 | Method, equipment and medium for monitoring three-phase load unbalance transformer area |
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| Publication Number | Publication Date |
|---|---|
| CN114123253A CN114123253A (en) | 2022-03-01 |
| CN114123253B true CN114123253B (en) | 2022-08-12 |
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