CN116780475A - Distribution transformer heavy overload treatment method, device, equipment and storage medium - Google Patents
Distribution transformer heavy overload treatment method, device, equipment and storage medium Download PDFInfo
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- CN116780475A CN116780475A CN202310726201.9A CN202310726201A CN116780475A CN 116780475 A CN116780475 A CN 116780475A CN 202310726201 A CN202310726201 A CN 202310726201A CN 116780475 A CN116780475 A CN 116780475A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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Abstract
The embodiment of the invention discloses a method, a device, equipment and a storage medium for managing heavy overload of a distribution transformer, wherein the method comprises the following steps: acquiring three-phase current history data of a secondary side of the current transformer; according to the three-phase current historical data, the load rate of the distribution transformer is obtained; according to the load rate, heavy overload data of a first target period are obtained; acquiring a heavy overload type in a second target time period according to the heavy overload data, wherein the duration of the second target time period is longer than that of the first target time period; and determining a heavy overload treatment scheme of the distribution transformer according to the heavy overload type. The method expands the time dimension for judging the heavy overload of the distribution transformer to acquire the corresponding heavy overload type, determines the corresponding treatment scheme aiming at different heavy overload types, and reduces the limitation in the heavy overload operation treatment of the distribution transformer.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method, a device, equipment and a storage medium for managing heavy overload of a distribution transformer.
Background
The distribution transformer is positioned at the terminal position of the whole power system and is responsible for converting the voltage provided by the power system into the voltage suitable for the requirements of consumer electric equipment. The operational quality and level of the distribution transformer directly affect the quality of the power supply service. When the distribution transformer is in heavy overload operation, high current, electric leakage and the like, the heavy overload of the power system can be caused, wherein the heavy overload caused by the heavy overload operation of the distribution transformer occupies the most, and the heavy overload is one of the main factors which plague the safe and stable operation of the distribution network system.
The reason for the heavy overload operation is clear, a reasonable judgment standard and a reasonable judgment method are provided, and the method plays an important role in solving the heavy overload operation, but the existing heavy overload judgment only judges the heavy overload of the day and month, so that the limitation exists in the management of the heavy overload operation of the distribution transformer.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a storage medium for managing heavy overload of a distribution transformer, which solve the problem that the heavy overload operation management of the distribution transformer is limited due to the fact that the existing time dimension for judging the heavy load operation of the distribution transformer is small.
The embodiment of the invention provides a method for treating heavy overload of a distribution transformer, which comprises the following steps:
Acquiring three-phase current history data of a secondary side of the current transformer;
according to the three-phase current historical data, the load rate of the distribution transformer is obtained;
according to the load rate, heavy overload data of a first target period are obtained;
acquiring a heavy overload type in a second target time period according to the heavy overload data, wherein the duration of the second target time period is longer than that of the first target time period;
and determining a heavy overload treatment scheme of the distribution transformer according to the heavy overload type.
Preferably, the obtaining the load factor of the distribution transformer according to the three-phase current history data includes:
selecting three-phase current, a transformation ratio of a current transformer and rated capacity of a distribution transformer in a certain time period, and acquiring all load rates in the time period, wherein the duration of the time period is smaller than that of a first target time period;
and acquiring the average load rate in the time period through the all load rates, and determining the average load rate as the load rate of the distribution transformer.
Preferably, the selecting the three-phase current, the transformation ratio of the current transformer and the rated capacity of the distribution transformer in a certain period of time to obtain all load rates in the period of time includes:
Acquiring an average value of three-phase currents acquired at each moment in the time period;
according to the average value of three-phase currents, the transformation ratio of a current transformer and the rated capacity of a distribution transformer, the load ratio of each moment is obtained;
the load ratios at all times in the time period are all load ratios in the time period.
Preferably, the selecting the three-phase current, the transformation ratio of the current transformer and the rated capacity of the distribution transformer in a certain period of time to obtain all load rates in the period of time includes:
acquiring current of A phase, B phase and C phase at each moment in the time period;
according to the currents of the phase A, the phase B and the phase C, the transformation ratio of the current transformer and the rated capacity of the distribution transformer, the corresponding load rates of the phase A, the phase B and the phase C at each moment are obtained;
taking the average value of the load rates of the phase A, the phase B and the phase C as the load rate at the moment;
the load ratios at all times in the time period are all load ratios in the time period.
Preferably, the obtaining heavy overload data of the first target period according to the load rate includes:
comparing the load rate with a first preset threshold value, and if the load rate is larger than the first preset threshold value, judging that the distribution transformer is heavy overload;
Acquiring a first time length of heavy overload in a first target period, comparing the first time length with a first time length threshold, and acquiring first heavy overload data in the first target period if the first time length is greater than or equal to the first time length threshold.
Preferably, the obtaining heavy overload data of the first target period according to the load factor further includes:
obtaining a second time length of the first heavy overload data in a first target period, comparing the second time length with a second time length threshold, and obtaining the second heavy overload data in the first target period if the second time length is greater than or equal to the second time length threshold, wherein the second time length threshold is greater than the first time length threshold.
Preferably, the obtaining the heavy overload type in the second target time period according to the heavy overload data includes:
acquiring a third time length of second heavy overload data in a second target time period, comparing the third time length with a third time length threshold, and if the third time length is greater than or equal to the third time length threshold, determining that the heavy overload in the second target time period is the first type heavy overload, wherein the third time length threshold is greater than the first time length threshold;
Otherwise, comparing the third time length with a fourth time length threshold, and if the third time length is greater than the fourth time length threshold and less than the third time length threshold, determining that the heavy overload in the second target time period is the second type heavy overload; wherein the fourth duration threshold is greater than the second duration threshold and less than the third duration threshold.
Preferably, after the obtaining heavy overload data of the first target period according to the load factor, the obtaining heavy overload type in a second target period according to the heavy overload data, where a duration of the second target period is greater than a duration of the first target period, and before the step of obtaining heavy overload type in the second target period, the method further includes:
acquiring first heavy overload data in a special period, and acquiring third type heavy overload data in the special period if the first heavy overload data exist in the special period; wherein the special period includes legal holidays, high temperature period, traveling season, crop sowing and harvesting time.
Preferably, the determining a heavy overload management scheme of the distribution transformer according to the heavy overload type includes:
screening a first load rate maximum value of the distribution transformer in the third duration, comparing the first load rate maximum value with a second preset threshold value, and if the first load rate maximum value is larger than the second preset threshold value, carrying out heavy overload treatment on the first type heavy overload;
Screening a second maximum value of the load rate of the distribution transformer in the fourth time period, comparing the second maximum value of the load rate with a second preset threshold value, and carrying out heavy overload treatment on the second type heavy overload if the second maximum value of the load rate is larger than the second preset threshold value.
Preferably, the determining the heavy overload management scheme of the distribution transformer according to the heavy overload type further includes:
screening a third maximum load rate of the distribution transformer in the special period, and comparing the third maximum load rate with a third preset threshold;
if the maximum value of the third load rate is larger than the third preset threshold value, treating the third type of heavy overload by adopting a first treatment mode;
and if the maximum value of the third load rate is smaller than or equal to the third preset threshold value, acquiring the three-phase current unbalance degree of the distribution transformer according to the three-phase current historical data in a special period, and if the three-phase current unbalance degree is larger than a fourth preset threshold value, adopting a second treatment mode to treat the third type of heavy overload.
The embodiment of the invention also provides a device for treating the heavy overload of the distribution transformer, which comprises the following components:
The first acquisition module is used for acquiring three-phase current history data of the secondary side of the current transformer;
the second acquisition module is used for acquiring the load rate of the distribution transformer according to the three-phase current historical data;
the third acquisition module is used for acquiring heavy overload data of the first target period according to the load rate;
a fourth obtaining module, configured to obtain, according to the heavy overload data, a heavy overload type in a second target time period, where a duration of the second target time period is greater than a duration of the first target time period;
and the control mode determining module is used for determining a heavy overload control scheme of the distribution transformer according to the heavy overload type.
The embodiment of the invention also provides a distribution transformer heavy overload management device, which comprises a memory and a processor, wherein the memory stores a computer program, and the computer program when executed by the processor causes the processor to execute the following steps:
acquiring three-phase current history data of a secondary side of the current transformer;
according to the three-phase current historical data, the load rate of the distribution transformer is obtained;
according to the load rate, heavy overload data of a first target period are obtained;
Acquiring a heavy overload type in a second target time period according to the heavy overload data, wherein the duration of the second target time period is longer than that of the first target time period;
and determining a heavy overload treatment scheme of the distribution transformer according to the heavy overload type.
The embodiment of the invention also provides a computer readable storage medium storing a computer program, which when being executed by a processor, causes the processor to execute the following steps:
acquiring three-phase current history data of a secondary side of the current transformer;
according to the three-phase current historical data, the load rate of the distribution transformer is obtained;
according to the load rate, heavy overload data of a first target period are obtained;
acquiring a heavy overload type in a second target time period according to the heavy overload data, wherein the duration of the second target time period is longer than that of the first target time period;
and determining a heavy overload treatment scheme of the distribution transformer according to the heavy overload type.
The embodiment of the invention has the following beneficial effects:
according to the heavy overload treatment method for the distribution transformer, disclosed by the embodiment of the invention, the load rate is obtained through three-phase current, then heavy overload data in the first target time period is obtained according to the load rate, the heavy overload type in the second target time period is obtained according to the heavy overload data in the first target time period, a specific treatment scheme is determined according to the heavy overload type, the time dimension for judging the heavy overload of the distribution transformer is expanded to obtain the corresponding heavy overload type, the corresponding treatment scheme is determined according to different heavy overload types, and the limitation in heavy overload operation treatment of the distribution transformer is reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
fig. 1 is a schematic flow chart of a method for controlling overload of a distribution transformer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a device for controlling heavy overload of a distribution transformer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a heavy overload treatment device for a distribution transformer according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a computer readable storage medium according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
For ease of understanding, the relevant terms to which the present application relates are first described below.
(1) The current transformer converts primary side large current into secondary side small current according to an electromagnetic induction principle.
(2) Distribution transformer, abbreviated as "distribution transformer", refers to a static electric appliance in a distribution system for transmitting ac power by converting ac voltage and current according to the law of electromagnetic induction.
(3) The heavy overload of the distribution transformer means that the total current of the electric equipment is larger than or equal to the rated maximum, and the maximum output power is constant, so that the voltage of the electric equipment becomes low, and the voltage is too low due to serious heavy overload.
As shown in fig. 1, a flow chart of a method for controlling overload of a distribution transformer according to an embodiment of the present application is shown, where the method includes:
step S101, three-phase current history data of a secondary side of a current transformer is obtained;
specifically, in this embodiment, three-phase currents on the secondary side of the current transformer are collected in real time, and history data of the three-phase currents are obtained.
It should be noted that, when the historical data of three-phase current is gathered, also can gather in the other positions of distribution transformer, in this embodiment, the current of gathering current transformer secondary side is selected, and the data is more reliable, and the collection is safer during.
It should be noted that, when the three-phase current on the secondary side of the current transformer is collected, the current may be achieved according to an existing collection means, for example, A, B, C three-phase current values collected by an existing distribution transformer current transformer protection device, which is not specifically limited in the embodiment of the present application.
Step S102, according to the three-phase current historical data, the load rate of the distribution transformer is obtained;
specifically, in this embodiment, as one implementation manner of the foregoing embodiment, the load factor of the distribution transformer is obtained according to the collected three-phase current history data, which may be calculated in real time according to the three-phase current collected in real time, and then the load factor in a certain period of time is obtained according to the load factor calculated in real time, so as to obtain the load factor of the distribution transformer in the period of time.
As another embodiment, the historical data of the three-phase current collected after a certain period of time can be averaged, and then the load factor of the distribution transformer in the period of time can be obtained according to the average value of the three-phase current in the period of time.
Step S103, obtaining heavy overload data of a first target period according to the load rate;
specifically, in this embodiment, the obtained load factor is compared with a set threshold, if the load factor is greater than or equal to the set threshold, the load factor is defined as heavy overload of the distribution transformer, then the load factor is compared with a set time threshold according to heavy overload in a time period, and if the occurrence time of heavy overload in a first target period is greater than or equal to a preset time threshold, heavy overload data of the first target period is obtained.
Step S104, obtaining a heavy overload type in a second target time period according to the heavy overload data, wherein the duration of the second target time period is longer than that of the first target time period;
specifically, in this embodiment, whether heavy overload occurs in the second target period is detected according to the obtained heavy overload data, and the heavy overload type is obtained according to the monitoring result.
And step S105, determining a heavy overload treatment scheme of the distribution transformer according to the heavy overload type.
Specifically, in this embodiment, the corresponding treatment scheme is determined according to the specific heavy overload type, so that the treatment scheme can be more rationalized.
It should be noted that, in this embodiment, the governance scheme may be an existing heavy overload technology, and a corresponding governance mode is selected according to a specific heavy overload type.
According to the heavy overload treatment method for the distribution transformer, disclosed by the embodiment, the load rate is obtained through the three-phase current, then heavy overload data in the first target time period is obtained according to the load rate, the heavy overload type in the second target time period is obtained according to the heavy overload data in the first target time period, a specific treatment scheme is determined according to the heavy overload type, the time dimension for judging the heavy overload of the distribution transformer is expanded to obtain the corresponding heavy overload type, the corresponding treatment scheme is determined according to different heavy overload types, and the limitation in heavy overload operation treatment of the distribution transformer is reduced.
In some embodiments, the obtaining the load ratio of the distribution transformer according to the three-phase current history data includes:
selecting three-phase current, a transformation ratio of a current transformer and rated capacity of a distribution transformer in a certain time period, and acquiring all load rates in the time period, wherein the duration of the time period is smaller than that of a first target time period;
preferably, the selecting the three-phase current, the transformation ratio of the current transformer and the rated capacity of the distribution transformer in a certain period of time to obtain all load rates in the period of time includes:
acquiring an average value of three-phase currents acquired at each moment in the time period;
according to the average value of three-phase currents, the transformation ratio of a current transformer and the rated capacity of a distribution transformer, the load ratio of each moment is obtained;
the load ratios at all times in the time period are all load ratios in the time period.
Preferably, the selecting the three-phase current, the transformation ratio of the current transformer and the rated capacity of the distribution transformer in a certain period of time to obtain all load rates in the period of time includes:
acquiring current of A phase, B phase and C phase at each moment in the time period;
according to the currents of the phase A, the phase B and the phase C, the transformation ratio of the current transformer and the rated capacity of the distribution transformer, the corresponding load rates of the phase A, the phase B and the phase C at each moment are obtained;
Taking the average value of the load rates of the phase A, the phase B and the phase C as the load rate at the moment;
the load ratios at all times in the time period are all load ratios in the time period.
And acquiring the average load rate in the time period through the all load rates, and determining the average load rate as the load rate of the distribution transformer.
Specifically, in the present embodiment, the load factor of the distribution transformer is calculated every hour, and the calculation is performed every 15 minutes.
One implementation way is as follows: firstly, calculating the average value of the current according to all three-phase currents acquired within 15 minutes, then obtaining the load factor within 15 minutes according to the calculated average value of the current, the transformation ratio of a current transformer and the rated capacity of a distribution transformer, obtaining 4 load factors per hour, and finally adding all loads obtained per hour and dividing by 4 to obtain the load factor of the distribution transformer within each hour.
Wherein, P is the load factor,for the average value of all phase currents collected at each moment, M is the transformation ratio of the current transformer, and N is the rated capacity of the distribution transformer.
As another implementation manner, firstly, collecting the currents of the phase a, the phase B and the phase C at each moment within 15 minutes, and obtaining the corresponding load rates of the phase a, the phase B and the phase C at each moment according to the transformation ratio of a current transformer and the rated capacity of a distribution transformer; and then calculating the average value of all the load factors within 15 minutes as the load factor of 15 minutes, obtaining 4 load factors in each hour, and finally adding all the loads obtained in each hour and dividing by 4 to obtain the load factor of the distribution transformer in each hour.
Wherein P is the load factor, x= A, B, C, I x Is three-phase current collected in real time.
And (3) calculating an average value for 4 times, and considering the comprehensive utilization efficiency and the energy-saving and environment-friendly requirements of the distribution transformer in the load rate calculation.
It should be noted that, when calculating the load factor, the time period and the sampling time may be adjusted according to actual needs.
In some embodiments, the obtaining heavy overload data of the first target period according to the load rate includes:
comparing the load rate with a first preset threshold value, and if the load rate is larger than the first preset threshold value, judging that the distribution transformer is heavy overload;
acquiring a first time length of heavy overload in a first target period, comparing the first time length with a first time length threshold, and acquiring first heavy overload data in the first target period if the first time length is greater than or equal to the first time length threshold.
Specifically, in this embodiment, the load factor calculated in each hour is compared with a first preset threshold, where the first preset threshold is set to 80%, that is, the load factor calculated in each hour is compared with 80%, and if the load factor calculated in the hour is greater than 80%, the distribution transformer is overloaded in the hour; the calculated load factor for each hour is compared to 100%, and if the calculated load factor for that hour is greater than 100%, the distribution transformer is overloaded during that hour.
In this embodiment, the first target period is set to one month, the first time length threshold for the dry-type transformer is set to 1 hour, the first time length threshold for the oil-immersed transformer is set to 2 hours, if the time of day when heavy overload occurs is greater than or equal to the set first time length threshold, the first heavy overload data of the day is obtained, otherwise, the first heavy overload data of the day is not obtained, and then the first heavy overload data of each month is obtained.
In some embodiments, the acquiring heavy overload data of the first target period according to the load factor further includes:
obtaining a second time length of the first heavy overload data in a first target period, comparing the second time length with a second time length threshold, and obtaining the second heavy overload data in the first target period if the second time length is greater than or equal to the second time length threshold, wherein the second time length threshold is greater than the first time length threshold.
Specifically, in this embodiment, the number of days of daily heavy overload occurring in each month is obtained, and then the number of days is compared with a set second time threshold, in this embodiment, the second time threshold is selected to be 10 days, if the number of days of heavy overload occurring is greater than or equal to 10 days, the second heavy overload data of the month is obtained, and if not, the second heavy overload data of the month is not heavy overload.
In some embodiments, the obtaining the heavy overload type in the second target period according to the heavy overload data includes:
acquiring a third time length of first heavy overload data in a second target time period, comparing the third time length with a third time length threshold, and if the third time length is greater than or equal to the third time length threshold, determining that the heavy overload in the second target time period is the first type heavy overload, wherein the third time length threshold is greater than the first time length threshold;
otherwise, comparing the third time length with a fourth time length threshold, and if the third time length is greater than the fourth time length threshold and less than the third time length threshold, determining that the heavy overload in the second target time period is the second type heavy overload; wherein the fourth duration threshold is greater than the second duration threshold and less than the third duration threshold.
Specifically, in this embodiment, the second target period is set to be one year, the number of months when the month heavy overload occurs in one year is obtained, the third duration threshold is set to be 6 months, and if the number of months when the month heavy overload occurs in one year is greater than or equal to 6 months, the first type heavy overload occurring in one year is a long-term heavy overload.
And if the number of months of the heavy overload in one year is less than 6 months, comparing the number of months of the heavy overload with a set fourth time length threshold, wherein the fourth time length threshold is set to be 2 months, and if the number of months of the heavy overload in one year is less than 6 months and more than or equal to 2 months, the heavy overload in the first type of distribution transformer in one year is seasonal heavy overload.
In some embodiments, after step S103, before step S104, the method further comprises:
acquiring first heavy overload data in a special period, and acquiring third type heavy overload data in the special period if the first heavy overload data exist in the special period; wherein the special period includes legal holidays, high temperature period, traveling season, crop sowing and harvesting time.
Specifically, in this embodiment, some special periods, such as the five and eleven hours of the legal holiday, are monitored separately, and if daily heavy overload occurs every day in the special period, the special period is defined as heavy overload.
In some embodiments, the determining a heavy overload governance scheme for the distribution transformer according to the heavy overload type includes:
Screening a first load rate maximum value of the distribution transformer in the third duration, comparing the first load rate maximum value with a second preset threshold value, and if the first load rate maximum value is larger than the second preset threshold value, carrying out heavy overload treatment on the first type heavy overload;
screening a second maximum value of the load rate of the distribution transformer in the fourth time period, comparing the second maximum value of the load rate with a second preset threshold value, and carrying out heavy overload treatment on the second type heavy overload if the second maximum value of the load rate is larger than the second preset threshold value.
Specifically, in this implementation, if a long-term heavy overload occurs in one year, the load factor when the heavy overload occurs in the third period of time obtains a first load factor maximum value, compares the first load factor maximum value with a set second preset threshold value, sets the second preset threshold value to 150%, and if the first load factor maximum value is greater than or equal to 150%, performs treatment by replacing the high-capacity distribution transformer and/or newly adding the distribution transformer to share the load, so as to achieve the goal of reducing the temperature rise when the distribution transformer operates.
If seasonal heavy overload occurs in one year, the load rate when the heavy overload occurs in the third time length is a second load rate maximum value, the second load rate maximum value is compared with a set second preset threshold value, the second preset threshold value is set to be 150%, if the second load rate maximum value is greater than or equal to 150%, the load is transferred through a newly added distribution point, a contact switch is adopted to share the load, the redundant transformer is taken out of operation in a small load season, and the scattered transformer is put into operation for treatment in a large load season. Otherwise, by enhancing the monitoring operation, the tight control industry amplifies more load.
In some embodiments, the determining a heavy overload governance scheme of the distribution transformer according to the heavy overload type further comprises:
screening a third maximum load rate of the distribution transformer in the special period, and comparing the third maximum load rate with a third preset threshold;
if the maximum value of the third load rate is larger than the third preset threshold value, treating the third type of heavy overload by adopting a first treatment mode;
and if the maximum value of the third load rate is smaller than or equal to the third preset threshold value, acquiring the three-phase current unbalance degree of the distribution transformer according to the three-phase current historical data in a special period, and if the three-phase current unbalance degree is larger than a fourth preset threshold value, adopting a second treatment mode to treat the third type of heavy overload.
Specifically, in this embodiment, if the occurrence of heavy overload is heavy overload in a special period, a third load factor maximum value of the distribution transformer in the special period is obtained, the third load factor maximum value is compared with a third preset threshold value, the third preset threshold value is 200%, if the third load factor maximum value is greater than or equal to 200%, the high overload distribution transformer or the on-load capacity-regulating distribution transformer is replaced for management, if the third load factor maximum value is less than 200%, the three-phase current unbalance degree of the distribution transformer is obtained according to the three-phase current history data in the special period, and if the three-phase current unbalance degree is greater than a fourth preset threshold value, the fourth preset threshold value is 80%, and the three-phase unbalance flexible-straight adjustment device is additionally arranged for management. Otherwise, the monitoring is carried out.
The calculation formula of the three-phase current unbalance is as follows:
wherein I is x-min Is the minimum value of the current of A phase, B phase and C phase, I x-max The maximum value of the current of the phase A, the phase B and the phase C is represented by Q, and the unbalance of the current of the three phases is represented by Q.
When calculating the three-phase current unbalance degree, the three-phase current unbalance degree corresponding to each acquisition time can be calculated through the maximum value and the minimum value in the three-phase current at each acquisition time, then all the three-phase current unbalance degrees in the special period are compared with a fourth preset threshold value, and if one three-phase current unbalance degree is larger than the fourth preset threshold value, the three-phase current unbalance degree is larger than the fourth preset threshold value.
It should be noted that the three-phase unbalanced flexible and straight adjusting device is a device capable of realizing treatment according to the three-phase unbalanced flexible and straight adjusting device in the prior art. The present application is not particularly limited as to the specific structure.
As shown in fig. 2, a schematic structural diagram of a device for controlling heavy overload of a distribution transformer according to an embodiment of the present application is provided, where the device includes:
a first obtaining module 201, configured to obtain three-phase current history data of a secondary side of the current transformer;
a second obtaining module 202, configured to obtain a load factor of the distribution transformer according to the three-phase current history data;
a third obtaining module 203, configured to obtain heavy overload data of a first target period according to the load rate;
a fourth obtaining module 204, configured to obtain, according to the heavy overload data, a heavy overload type in a second target time period, where a duration of the second target time period is greater than a duration of the first target time period;
and the governance mode determining module 205 is configured to determine a heavy overload governance scheme of the distribution transformer according to the heavy overload type.
In some embodiments, the second acquisition module is further to:
selecting three-phase current, a transformation ratio of a current transformer and rated capacity of a distribution transformer in a certain time period, and acquiring all load rates in the time period, wherein the duration of the time period is smaller than that of a first target time period;
And acquiring the average load rate in the time period through the all load rates, and determining the average load rate as the load rate of the distribution transformer.
In some embodiments, the second acquisition module is further to:
acquiring an average value of three-phase currents acquired at each moment in the time period;
according to the average value of three-phase currents, the transformation ratio of a current transformer and the rated capacity of a distribution transformer, the load ratio of each moment is obtained;
the load ratios at all times in the time period are all load ratios in the time period.
In some embodiments, the second acquisition module is further to:
acquiring current of A phase, B phase and C phase at each moment in the time period;
according to the currents of the phase A, the phase B and the phase C, the transformation ratio of the current transformer and the rated capacity of the distribution transformer, the corresponding load rates of the phase A, the phase B and the phase C at each moment are obtained;
taking the average value of the load rates of the phase A, the phase B and the phase C as the load rate at the moment;
the load ratios at all times in the time period are all load ratios in the time period.
In some embodiments, the third acquisition module is further to:
comparing the load rate with a first preset threshold value, and if the load rate is larger than the first preset threshold value, judging that the distribution transformer is heavy overload;
Acquiring a first time length of heavy overload in a first target period, comparing the first time length with a first time length threshold, and acquiring first heavy overload data in the first target period if the first time length is greater than or equal to the first time length threshold.
In some embodiments, the third acquisition module is further to:
obtaining a second time length of the first heavy overload data in a first target period, comparing the second time length with a second time length threshold, and obtaining the second heavy overload data in the first target period if the second time length is greater than or equal to the second time length threshold, wherein the second time length threshold is greater than the first time length threshold.
In some embodiments, the fourth acquisition module is further to:
acquiring a third time length of second heavy overload data in a second target time period, comparing the third time length with a third time length threshold, and if the third time length is greater than or equal to the third time length threshold, determining that the heavy overload in the second target time period is the first type heavy overload, wherein the third time length threshold is greater than the first time length threshold;
otherwise, comparing the third time length with a fourth time length threshold, and if the third time length is greater than the fourth time length threshold and less than the third time length threshold, determining that the heavy overload in the second target time period is the second type heavy overload; wherein the fourth duration threshold is greater than the second duration threshold and less than the third duration threshold.
In some embodiments, the apparatus further comprises:
a fifth obtaining module, configured to obtain first heavy overload data in a special period, and if the first heavy overload data exist in the special period, obtain a third type heavy overload in the special period; wherein the special period includes legal holidays, high temperature period, traveling season, crop sowing and harvesting time.
In some embodiments, the governance mode determination module is further to:
screening a first load rate maximum value of the distribution transformer in the third duration, comparing the first load rate maximum value with a second preset threshold value, and if the first load rate maximum value is larger than the second preset threshold value, carrying out heavy overload treatment on the first type heavy overload;
screening a second maximum value of the load rate of the distribution transformer in the fourth time period, comparing the second maximum value of the load rate with a second preset threshold value, and carrying out heavy overload treatment on the second type heavy overload if the second maximum value of the load rate is larger than the second preset threshold value.
In some embodiments, the governance mode determination module is further to:
Screening a third maximum load rate of the distribution transformer in the special period, and comparing the third maximum load rate with a third preset threshold;
if the maximum value of the third load rate is larger than the third preset threshold value, treating the third type of heavy overload by adopting a first treatment mode;
and if the maximum value of the third load rate is smaller than or equal to the third preset threshold value, acquiring the three-phase current unbalance degree of the distribution transformer according to the three-phase current historical data in a special period, and if the three-phase current unbalance degree is larger than a fourth preset threshold value, adopting a second treatment mode to treat the third type of heavy overload.
For further details of implementing the above technical solution by each module in the heavy overload treatment device for a distribution transformer, reference may be made to the description in the heavy overload treatment method for a distribution transformer provided above, which is not repeated herein.
In some embodiments, as shown in fig. 3, a schematic structural diagram of a heavy overload management apparatus for a distribution transformer according to an embodiment of the present invention is provided, where the apparatus includes a memory 301 and a processor 302, where the memory 301 stores a computer program, and the computer program when executed by the processor 302 causes the processor 302 to perform the following steps:
Acquiring three-phase current history data of a secondary side of the current transformer;
according to the three-phase current historical data, the load rate of the distribution transformer is obtained;
according to the load rate, heavy overload data of a first target period are obtained;
acquiring a heavy overload type in a second target time period according to the heavy overload data, wherein the duration of the second target time period is longer than that of the first target time period;
and determining a heavy overload treatment scheme of the distribution transformer according to the heavy overload type.
For further details regarding implementation of the above technical solution by the processor 301 in the distribution transformer overload management apparatus, reference may be made to the description in the above provided distribution transformer overload management method, which is not repeated here.
The processor 302 may also be called a CPU (Central Processing Unit ), and the processor 302 may be an integrated circuit chip with signal processing capability; the processor 302 may also be a general purpose processor, such as a microprocessor or the processor 302 may be any conventional processor, a DSP (Digital Signal Process, digital signal processor), ASIC (Application Specific Integrated Circuit ), FPGA (Field Programmable Gata Array, field programmable gate array) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like.
In some embodiments, as shown in fig. 4, a schematic structural diagram of a computer readable storage medium according to an embodiment of the present invention is provided, where a readable computer program 401 is stored on the storage medium; the computer program 401 may be stored in the storage medium in the form of a software product, and includes several instructions to make a computer device (which may be a personal computer, a service machine, or a network device, etc.) or a processor (processor) execute the following steps:
acquiring three-phase current history data of a secondary side of the current transformer;
according to the three-phase current historical data, the load rate of the distribution transformer is obtained;
according to the load rate, heavy overload data of a first target period are obtained;
acquiring a heavy overload type in a second target time period according to the heavy overload data, wherein the duration of the second target time period is longer than that of the first target time period;
and determining a heavy overload treatment scheme of the distribution transformer according to the heavy overload type.
And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a magnetic or optical disk, a ROM (Read-Only Memory), a RAM (Random Access Memory), or a terminal device such as a computer, a service machine, a mobile phone, or a tablet.
Those skilled in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by a computer program for instructing relevant hardware, where the program may be stored in a non-volatile computer readable storage medium, and where the program, when executed, may include processes in the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (13)
1. A method of distribution transformer heavy overload management, the method comprising:
acquiring three-phase current history data of a secondary side of the current transformer;
according to the three-phase current historical data, the load rate of the distribution transformer is obtained;
according to the load rate, heavy overload data of a first target period are obtained;
acquiring a heavy overload type in a second target time period according to the heavy overload data, wherein the duration of the second target time period is longer than that of the first target time period;
And determining a heavy overload treatment scheme of the distribution transformer according to the heavy overload type.
2. The method for handling heavy overload of a distribution transformer according to claim 1, wherein said obtaining a load factor of the distribution transformer according to the three-phase current history data comprises:
selecting three-phase current, a transformation ratio of a current transformer and rated capacity of a distribution transformer in a certain time period, and acquiring all load rates in the time period, wherein the duration of the time period is smaller than that of a first target time period;
and acquiring the average load rate in the time period through the all load rates, and determining the average load rate as the load rate of the distribution transformer.
3. The method for controlling heavy overload of distribution transformer according to claim 2, wherein selecting three-phase current, transformation ratio of current transformer and rated capacity of distribution transformer in a certain period of time, obtaining all load ratios in the period of time comprises:
acquiring an average value of three-phase currents acquired at each moment in the time period;
according to the average value of three-phase currents, the transformation ratio of a current transformer and the rated capacity of a distribution transformer, the load ratio of each moment is obtained;
The load ratios at all times in the time period are all load ratios in the time period.
4. The method for controlling heavy overload of distribution transformer according to claim 2, wherein selecting three-phase current, transformation ratio of current transformer and rated capacity of distribution transformer in a certain period of time, obtaining all load ratios in the period of time comprises:
acquiring current of A phase, B phase and C phase at each moment in the time period;
according to the currents of the phase A, the phase B and the phase C, the transformation ratio of the current transformer and the rated capacity of the distribution transformer, the corresponding load rates of the phase A, the phase B and the phase C at each moment are obtained;
taking the average value of the load rates of the phase A, the phase B and the phase C as the load rate at the moment;
the load ratios at all times in the time period are all load ratios in the time period.
5. The method for controlling heavy overload of a distribution transformer according to any one of claims 1 or 2, wherein the obtaining heavy overload data of the first target period according to the load factor includes:
comparing the load rate with a first preset threshold value, and if the load rate is larger than the first preset threshold value, judging that the distribution transformer is heavy overload;
acquiring a first time length of heavy overload in a first target period, comparing the first time length with a first time length threshold, and acquiring first heavy overload data in the first target period if the first time length is greater than or equal to the first time length threshold.
6. The method for managing heavy overload of a distribution transformer according to claim 5, wherein said obtaining heavy overload data of a first target period according to said load factor further comprises:
obtaining a second time length of the first heavy overload data in a first target period, comparing the second time length with a second time length threshold, and obtaining the second heavy overload data in the first target period if the second time length is greater than or equal to the second time length threshold, wherein the second time length threshold is greater than the first time length threshold.
7. The method for controlling heavy overload of a distribution transformer according to claim 6, wherein said obtaining the heavy overload type in the second target period according to the heavy overload data includes:
acquiring a third time length of second heavy overload data in a second target time period, comparing the third time length with a third time length threshold, and if the third time length is greater than or equal to the third time length threshold, determining that the heavy overload in the second target time period is the first type heavy overload, wherein the third time length threshold is greater than the first time length threshold;
otherwise, comparing the third time length with a fourth time length threshold, and if the third time length is greater than the fourth time length threshold and less than the third time length threshold, determining that the heavy overload in the second target time period is the second type heavy overload; wherein the fourth duration threshold is greater than the second duration threshold and less than the third duration threshold.
8. The method for controlling heavy overload of a distribution transformer according to claim 7, wherein after obtaining heavy overload data of a first target period according to the load factor, the method further comprises, according to the heavy overload data, obtaining a heavy overload type in a second target period, where a duration of the second target period is greater than a duration of the first target period, before:
acquiring first heavy overload data in a special period, and acquiring third type heavy overload data in the special period if the first heavy overload data exist in the special period; wherein the special period includes legal holidays, high temperature period, traveling season, crop sowing and harvesting time.
9. The method of claim 8, wherein said determining a heavy overload management scheme for said distribution transformer based on said heavy overload type comprises:
screening a first load rate maximum value of the distribution transformer in the third duration, comparing the first load rate maximum value with a second preset threshold value, and if the first load rate maximum value is larger than the second preset threshold value, carrying out heavy overload treatment on the first type heavy overload;
Screening a second maximum value of the load rate of the distribution transformer in the fourth time period, comparing the second maximum value of the load rate with a second preset threshold value, and carrying out heavy overload treatment on the second type heavy overload if the second maximum value of the load rate is larger than the second preset threshold value.
10. The method of claim 9, wherein said determining a heavy overload management scheme for said distribution transformer based on said heavy overload type further comprises:
screening a third maximum load rate of the distribution transformer in the special period, and comparing the third maximum load rate with a third preset threshold;
if the maximum value of the third load rate is larger than the third preset threshold value, treating the third type of heavy overload by adopting a first treatment mode;
and if the maximum value of the third load rate is smaller than or equal to the third preset threshold value, acquiring the three-phase current unbalance degree of the distribution transformer according to the three-phase current historical data in a special period, and if the three-phase current unbalance degree is larger than a fourth preset threshold value, adopting a second treatment mode to treat the third type of heavy overload.
11. A distribution transformer heavy overload remediation device, the device comprising:
the first acquisition module is used for acquiring three-phase current history data of the secondary side of the current transformer;
the second acquisition module is used for acquiring the load rate of the distribution transformer according to the three-phase current historical data;
the third acquisition module is used for acquiring heavy overload data of the first target period according to the load rate;
a fourth obtaining module, configured to obtain, according to the heavy overload data, a heavy overload type in a second target time period, where a duration of the second target time period is greater than a duration of the first target time period;
and the control mode determining module is used for determining a heavy overload control scheme of the distribution transformer according to the heavy overload type.
12. A distribution transformer overload management apparatus comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of the method of any of claims 1 to 10.
13. A computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of the method of any one of claims 1 to 10.
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| CN202310726201.9A CN116780475A (en) | 2023-06-19 | 2023-06-19 | Distribution transformer heavy overload treatment method, device, equipment and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310726201.9A CN116780475A (en) | 2023-06-19 | 2023-06-19 | Distribution transformer heavy overload treatment method, device, equipment and storage medium |
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