CN116780475A - Distribution transformer heavy overload treatment method, device, equipment and storage medium - Google Patents

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

Distribution transformer heavy overload control methods, devices, equipment and storage media

Technical field

The present invention relates to the field of electric power technology, and in particular to a distribution transformer heavy overload control method, device, equipment and storage medium.

Background technique

The distribution transformer is at the terminal position of the entire power system and is responsible for converting the voltage provided by the power system into a voltage suitable for the needs of users' electrical equipment. The operation quality and operation level of distribution transformers directly affect the quality of power supply services. When the distribution transformer experiences heavy overload operation, large current, leakage, etc., it will lead to heavy overload and heavy overload in the power system. Among them, the heavy overload and heavy overload caused by the heavy overload operation of the distribution transformer account for the most, which is a problem that troubles the safe and stable operation of the distribution network system. One of the main factors.

Clarifying the causes of heavy overload operation and proposing reasonable judgment standards and methods play an important role in solving heavy overload operation. However, the existing heavy overload judgment only judges the daily and monthly heavy overload, which makes the distribution transformer operate under heavy overload. There are limits to governance.

Contents of the invention

Embodiments of the present invention provide a method, device, equipment and storage medium for controlling heavy overload of a distribution transformer, which solves the problem of limitations in the current management of heavy overload operation of a distribution transformer due to the limited time dimension for determining the overload operation of a distribution transformer. The problem.

An embodiment of the present invention provides a distribution transformer heavy overload control method, which method includes:

Obtain the three-phase current historical data of the secondary side of the current transformer;

According to the three-phase current historical data, obtain the load factor of the distribution transformer;

According to the load rate, obtain the heavy overload data of the first target period;

According to the heavy overload data, obtain the heavy overload type within a second target time period, where the duration of the second target time period is greater than the duration of the first target time period;

According to the heavy overload type, a heavy overload treatment plan for the distribution transformer is determined.

Preferably, obtaining the load factor of the distribution transformer based on the three-phase current historical data includes:

Select the three-phase current, current transformer ratio and rated capacity of the distribution transformer within a certain time period to obtain all load factors within the time period, where the length of the time period is less than the first target time period;

Through all the load factors, the average load factor within the time period is obtained, and the average load factor is determined as the load factor of the distribution transformer.

Preferably, the three-phase current, current transformer ratio and rated capacity of the distribution transformer are selected within a certain period of time to obtain all load factors within the period of time, including:

Obtain the average value of the three-phase current collected at each moment during the time period;

According to the average value of the three-phase current, the current transformer ratio and the rated capacity of the distribution transformer, the load factor at each moment is obtained;

The load rate at all times in this time period is the load rate at all times in this time period.

Preferably, the three-phase current, current transformer ratio and rated capacity of the distribution transformer are selected within a certain period of time to obtain all load factors within the period of time, including:

Obtain the A-phase, B-phase and C-phase currents at each moment during this time period;

According to the A-phase, B-phase and C-phase currents, the current transformer ratio and the rated capacity of the distribution transformer, obtain the corresponding load factors of A-phase, B-phase and C at each moment;

Take the average of the load rates of phase A, phase B and phase C as the load rate at that moment;

The load rate at all times in this time period is the load rate at all times in this time period.

Preferably, obtaining the heavy overload data of the first target period according to the load rate includes:

Compare the load rate with a first preset threshold, and if the load rate is greater than the first preset threshold, determine that the distribution transformer is heavily overloaded;

Obtain the first duration during which heavy overload occurs within the first target period, compare the first duration with the first duration threshold, and if the first duration is greater than or equal to the first duration threshold, obtain the first target period The first overload data within.

Preferably, obtaining the heavy overload data of the first target period according to the load rate further includes:

Obtain the second duration during which the first heavy overload data occurs within the first target period, compare the second duration with a second duration threshold, and obtain the second duration if the second duration is greater than or equal to the second duration threshold. The second overload data within the first target period, wherein the second duration threshold is greater than the first duration threshold.

Preferably, obtaining the heavy overload type in the second target time period based on the heavy overload data includes:

Obtain the third duration during which the second heavy overload data occurs within the second target time period, and compare the third duration with the third duration threshold. If the third duration is greater than or equal to the third duration threshold, then the second The heavy overload and heavy overload within the target time period are the first type of heavy overload and heavy overload, and the third duration threshold is greater than the first duration threshold;

Otherwise, the third duration is compared with the fourth duration threshold. If the third duration is greater than the fourth duration threshold and less than the third duration threshold, then the heavy overload in the second target time period is The second type of heavy overload is heavy overload; wherein the fourth duration threshold is greater than the second duration threshold and less than the third duration threshold.

Preferably, after the heavy overload data of the first target period is obtained according to the load rate, the heavy overload type in the second target time period is obtained based on the heavy overload data. The second target time period Before the duration is longer than the duration of the first target time period, the method further includes:

Obtain the first overload data of the special period. If the first overload data exists in the special period, obtain the third type of heavy overload data in the special period. The special period includes legal holidays and high temperature periods. , tourist season, crop sowing and harvesting time.

Preferably, the heavy overload treatment plan for the distribution transformer is determined according to the heavy overload type, including:

Screen the first maximum load rate of the distribution transformer within the third period of time, compare the first maximum load rate with a second preset threshold, and if the first maximum load rate is greater than the third 2. Preset thresholds to perform heavy overload management for the first type of heavy overload;

Screen the second maximum load rate of the distribution transformer within the fourth period of time, compare the second maximum load rate with the second preset threshold, and if the second maximum load rate is greater than the second preset threshold, The second preset threshold is used to perform heavy overload management for the second type of heavy overload.

Preferably, determining a heavy overload treatment plan for the distribution transformer according to the heavy overload type further includes:

Screen the third maximum load factor of the distribution transformer within the special period, and compare the third maximum load factor with a third preset threshold;

If the third maximum load rate is greater than the third preset threshold, a first management method is adopted for the third type of heavy overload and heavy overload;

If the third maximum load factor is less than or equal to the third preset threshold, the three-phase current unbalance degree of the distribution transformer is obtained based on the three-phase current historical data in a special period. If the three-phase current If the degree of imbalance is greater than the fourth preset threshold, the third type of heavy overload and heavy overload are treated in a second management method.

An embodiment of the present invention also provides a distribution transformer heavy overload control device, which includes:

The first acquisition module is used to acquire the three-phase current historical data of the secondary side of the current transformer;

The second acquisition module is used to acquire the load factor of the distribution transformer based on the three-phase current historical data;

The third acquisition module is used to acquire the heavy overload data of the first target period according to the load rate;

A fourth acquisition module, configured to acquire the heavy overload type within a second target time period based on the heavy overload data, where the duration of the second target time period is greater than the duration of the first target time period;

A management method determination module is used to determine a heavy overload treatment plan for the distribution transformer according to the heavy overload type.

An embodiment of the present invention also provides a distribution transformer heavy overload control device, which includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor executes the following step:

Obtain the three-phase current historical data of the secondary side of the current transformer;

According to the three-phase current historical data, obtain the load factor of the distribution transformer;

According to the load rate, obtain the heavy overload data of the first target period;

According to the heavy overload data, obtain the heavy overload type within a second target time period, where the duration of the second target time period is greater than the duration of the first target time period;

According to the heavy overload type, a heavy overload treatment plan for the distribution transformer is determined.

Embodiments of the present invention also provide a computer-readable storage medium that stores a computer program. When the computer program is executed by a processor, it causes the processor to perform the following steps:

Obtain the three-phase current historical data of the secondary side of the current transformer;

According to the three-phase current historical data, obtain the load factor of the distribution transformer;

According to the load rate, obtain the heavy overload data of the first target period;

According to the heavy overload data, obtain the heavy overload type within a second target time period, where the duration of the second target time period is greater than the duration of the first target time period;

According to the heavy overload type, a heavy overload treatment plan for the distribution transformer is determined.

Adopting the embodiments of the present invention has the following beneficial effects:

The embodiment of the present invention discloses a method for controlling heavy overload of a distribution transformer. The load factor is obtained through three-phase current, and then the heavy overload data in the first target time period is obtained according to the load factor. The heavy overload data in the first target time period is then obtained. Obtain the heavy overload type in the second target time period, determine the specific treatment plan according to the heavy overload type, expand the time dimension of the distribution transformer heavy overload determination, obtain the corresponding heavy overload type, and determine the corresponding treatment for different heavy overload types. This solution reduces the limitations in the management of heavy overload operation of distribution transformers.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

in:

Figure 1 is a schematic flow chart of a distribution transformer heavy overload control method provided by an embodiment of the present invention;

Figure 2 is a schematic structural diagram of a distribution transformer heavy overload control device provided by an embodiment of the present invention;

Figure 3 is a schematic structural diagram of a distribution transformer heavy overload control device provided by an embodiment of the present invention;

Figure 4 is a schematic structural diagram of a computer-readable storage medium provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

For ease of understanding, the relevant terms involved in this application are first introduced below.

(1) Current transformer, based on the principle of electromagnetic induction, converts large current on the primary side into small current on the secondary side.

(2) Distribution transformer, referred to as "distribution transformer", refers to a static electrical appliance in the distribution system that transforms AC voltage and current according to the law of electromagnetic induction and transmits AC power.

(3) Heavy overload of the distribution transformer means that the total current of the electrical equipment is greater than or equal to the rated maximum, but the maximum output power is constant, so the voltage of the electrical equipment will become low, and severe heavy overload will make the voltage too low.

As shown in Figure 1, it is a schematic flow chart of a distribution transformer heavy overload control method provided by an embodiment of the present invention. The method includes:

Step S101, obtain the three-phase current historical data of the secondary side of the current transformer;

Specifically, in this embodiment, the three-phase current on the secondary side of the current transformer is collected in real time to obtain historical data of the three-phase current.

It should be noted that when collecting historical data of three-phase current, it can also be collected at other locations of the distribution transformer. In this embodiment, the current on the secondary side of the current transformer is selected to collect, so that the data is more reliable and the data can be collected during collection. safer.

It should be noted that when collecting the three-phase current on the secondary side of the current transformer, it can be achieved according to the existing collection means, such as the three-phase A, B, and C collected by the existing distribution transformer current transformer protection device. The current value is not specifically limited in the embodiments of this application.

Step S102: Obtain the load factor of the distribution transformer based on the three-phase current historical data;

Specifically, in this embodiment, as one of the implementations, the load factor of the distribution transformer is obtained based on the collected historical data of the three-phase current. The load factor can be calculated in real time based on the three-phase current collected in real time, and then based on The load factor calculated in real time is used to obtain the load factor within a certain period of time, and then the load factor of the distribution transformer within that period of time is obtained.

As another implementation, the historical data of the three-phase current collected after a certain period of time can be averaged, and then the power distribution in the period of time can be obtained based on the average value of the three-phase current in the period of time. The load factor of the transformer.

Step S103: Obtain the heavy overload data of the first target period according to the load rate;

Specifically, in this embodiment, the obtained load rate is compared with the set threshold. If the load rate is greater than or equal to the set threshold, it is defined as a heavy overload of the distribution transformer, and then the distribution transformer is defined as a heavy overload according to the heavy overload and The set time threshold is compared. If the duration of heavy overload in the first target period is greater than or equal to the preset time threshold, the heavy overload data of the first target period is obtained.

Step S104: Obtain the heavy overload type in a second target time period based on the heavy overload data, and the duration of the second target time period is greater than the duration of the first target time period;

Specifically, in this embodiment, whether heavy overload occurs in the second target time period is detected based on the acquired heavy overload data, and the heavy overload type is obtained based on the monitoring results.

Step S105: Determine a heavy overload treatment plan for the distribution transformer according to the heavy overload type.

Specifically, in this embodiment, the corresponding treatment plan is determined according to the specific heavy overload type, which can make the treatment plan more rational.

It should be noted that in this embodiment, the management solution can be the existing heavy overload technology, and the corresponding management method is selected according to the specific heavy overload type.

This embodiment discloses a method for controlling heavy overload of distribution transformers. The load factor is obtained through three-phase current, and then the heavy overload data in the first target time period is obtained according to the load factor. The heavy overload data in the first target time period is obtained. The heavy overload type in the second target time period determines the specific treatment plan according to the heavy overload type, expands the time dimension of the distribution transformer heavy overload determination to obtain the corresponding heavy overload type, and determines the corresponding treatment plan for different heavy overload types. , reducing the limitations in the management of heavy overload operation of distribution transformers.

In some embodiments, obtaining the load factor of the distribution transformer based on the three-phase current historical data includes:

Select the three-phase current, current transformer ratio and rated capacity of the distribution transformer within a certain time period to obtain all load factors within the time period, where the length of the time period is less than the first target time period;

Preferably, the three-phase current, current transformer ratio and rated capacity of the distribution transformer are selected within a certain period of time to obtain all load factors within the period of time, including:

Obtain the average value of the three-phase current collected at each moment during the time period;

According to the average value of the three-phase current, the current transformer ratio and the rated capacity of the distribution transformer, the load factor at each moment is obtained;

The load rate at all times in this time period is the load rate at all times in this time period.

Preferably, the three-phase current, current transformer ratio and rated capacity of the distribution transformer are selected within a certain period of time to obtain all load factors within the period of time, including:

Obtain the A-phase, B-phase and C-phase currents at each moment during this time period;

According to the A-phase, B-phase and C-phase currents, the current transformer ratio and the rated capacity of the distribution transformer, obtain the corresponding load factors of A-phase, B-phase and C at each moment;

Take the average of the load rates of phase A, phase B and phase C as the load rate at that moment;

The load rate at all times in this time period is the load rate at all times in this time period.

Through all the load factors, the average load factor within the time period is obtained, and the average load factor is determined as the load factor of the distribution transformer.

Specifically, in this implementation, the load factor of the distribution transformer is calculated every hour and calculated every 15 minutes as an example.

One of the implementation methods is: first, calculate the average value of the current based on all three-phase currents collected within 15 minutes, and then obtain the average value of the current based on the calculated average current value, the current transformer ratio and the rated capacity of the distribution transformer. For the load rate within 15 minutes, 4 load rates can be obtained for each hour. Finally, add all the loads obtained for each hour and divide by 4 to obtain the load rate of the distribution transformer for each hour.

Among them, P is the load rate, is the average value of all phase currents collected at each moment, M is the current transformer ratio, and N is the rated capacity of the distribution transformer.

As another implementation method, first collect the A-phase, B-phase and C-phase currents collected at each moment within 15 minutes, the current transformer ratio and the rated capacity of the distribution transformer, and obtain the A-phase, B-phase current at each moment. The load rate corresponding to phase and C; then calculate the average of all load rates within 15 minutes to be the load rate for 15 minutes, then 4 load rates can be obtained per hour, and finally all the loads obtained per hour Add and divide by 4 to get the load factor of the distribution transformer in each hour.

Among them, P is the load rate, x = A, B, C, and I _x is the three-phase current collected in real time.

By calculating the average of 4 times, the comprehensive utilization efficiency and energy saving and environmental protection requirements of the distribution transformer are considered in the load factor calculation.

It should be noted that when calculating the load rate, the time period and sampling moment can be adjusted according to actual needs.

In some embodiments, obtaining the heavy overload data of the first target period according to the load rate includes:

Compare the load rate with a first preset threshold, and if the load rate is greater than the first preset threshold, determine that the distribution transformer is heavily overloaded;

Obtain the first duration during which heavy overload occurs within the first target period, compare the first duration with the first duration threshold, and if the first duration is greater than or equal to the first duration threshold, obtain the first target period The first overload data within.

Specifically, in this embodiment, the load rate calculated every hour is compared with a first preset threshold, where the first preset threshold is set to 80%, that is, the load rate calculated every hour is compared with 80%. , if the calculated load rate in that hour is greater than 80%, the distribution transformer will be overloaded in that hour; compare the calculated load rate in each hour with 100%, if the calculated load rate in that hour is greater than 100%, then in that hour Distribution transformers are overloaded within hours.

In this embodiment, the first target period is set to one month, the first duration threshold for dry-type transformers is set to 1 hour, and the first duration threshold for oil-immersed transformers is set to 2 hours. If in one day, If the hour duration of a heavy overload hour is greater than or equal to the set first duration threshold, then the first heavy overload data of the day is obtained as the daily heavy overload. Otherwise, it is the non-heavy overload on the day, and then the first heavy overload of each month is obtained. data.

In some embodiments, obtaining the heavy overload data of the first target period according to the load rate further includes:

Obtain the second duration during which the first heavy overload data occurs within the first target period, compare the second duration with a second duration threshold, and obtain the second duration if the second duration is greater than or equal to the second duration threshold. The second overload data within the first target period, wherein the second duration threshold is greater than the first duration threshold.

Specifically, in this embodiment, the number of days in which daily weight overload occurs every month is obtained, and then the number of days is compared with the set second duration threshold. In this embodiment, the second duration threshold is selected to be 10 days. If If the number of days when heavy overload occurs is greater than or equal to 10 days, the second heavy overload data of the month will be obtained as the monthly heavy overload, otherwise it will be the monthly heavy overload.

In some embodiments, obtaining the heavy overload type in the second target time period based on the heavy overload data includes:

Obtain the third duration during which the first heavy overload data occurs within the second target time period, and compare the third duration with the third duration threshold. If the third duration is greater than or equal to the third duration threshold, then the second The heavy overload and heavy overload within the target time period are the first type of heavy overload and heavy overload, and the third duration threshold is greater than the first duration threshold;

Otherwise, the third duration is compared with the fourth duration threshold. If the third duration is greater than the fourth duration threshold and less than the third duration threshold, then the heavy overload in the second target time period is The second type of heavy overload is 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 time period is set to one year, and the number of months in which monthly weight overload occurs within one year is obtained. The third duration threshold is set to 6 months. If the number of months in which monthly weight overload occurs within one year is obtained, If the number is greater than or equal to 6 months, the first type of heavy overload that appears on the distribution transformer within one year is long-term heavy overload.

If the number of months with monthly weight overload in a year is less than 6 months, the number of months with monthly weight overload will be compared with the set fourth duration threshold. The fourth duration threshold is set to 2 months. If monthly weight overload occurs If the number of months is less than 6 months and greater than or equal to 2 months, the first type of heavy overload that appears on the distribution transformer within one year is seasonal heavy overload.

In some embodiments, after step S103 and before step S104, the method further includes:

Obtain the first overload data of the special period. If the first overload data exists in the special period, obtain the third type of heavy overload data in the special period. The special period includes legal holidays and high temperature periods. , tourist season, crop sowing and harvesting time.

Specifically, in this embodiment, some special periods, such as the May Day and National Day periods of legal holidays, are separately monitored. If a daily heavy overload occurs every day in the special period, it is defined as a special period heavy overload.

In some embodiments, determining a heavy overload treatment plan for the distribution transformer according to the heavy overload type includes:

Screen the first maximum load rate of the distribution transformer within the third period of time, compare the first maximum load rate with a second preset threshold, and if the first maximum load rate is greater than the third 2. Preset thresholds to perform heavy overload management for the first type of heavy overload;

Screen the second maximum load rate of the distribution transformer within the fourth period of time, compare the second maximum load rate with the second preset threshold, and if the second maximum load rate is greater than the second preset threshold, The second preset threshold is used to perform heavy overload management for the second type of heavy overload.

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 is used to obtain the maximum first load factor, and the first load factor is maximized The value is compared with the set second preset threshold, and the second preset threshold is set to 150%. If the first maximum load rate is greater than or equal to 150%, the system will replace the large-capacity distribution transformer and/or add new distribution The electric transformers share the load for management to achieve the goal of reducing the temperature rise of the distribution transformers during operation.

If seasonal heavy overload occurs during the year, the load rate when heavy overload occurs in the third period of time is used to obtain the second maximum load rate, and the second maximum load rate is combined with the set second preset value. Set the threshold for comparison, and set the second preset threshold to 150%. If the second maximum load rate is greater than or equal to 150%, the load will be transferred by adding new distribution points, and the contact switch will be used to share the load. In the light load season, the redundant The transformers will be taken out of operation, and decentralized transformers will be put into operation for management during heavy load seasons. Otherwise, by strengthening monitoring operations and strictly controlling industry expansion, more loads will be added.

In some embodiments, determining a heavy overload treatment plan for the distribution transformer according to the heavy overload type further includes:

Screen the third maximum load factor of the distribution transformer within the special period, and compare the third maximum load factor with a third preset threshold;

If the third maximum load rate is greater than the third preset threshold, a first management method is adopted for the third type of heavy overload and heavy overload;

If the third maximum load factor is less than or equal to the third preset threshold, the three-phase current unbalance degree of the distribution transformer is obtained based on the three-phase current historical data in a special period. If the three-phase current If the degree of imbalance is greater than the fourth preset threshold, the third type of heavy overload and heavy overload are treated in a second management method.

Specifically, in this embodiment, if the heavy overload that occurs is a heavy overload in a special period, the third maximum load factor of the distribution transformer in the special period is obtained, and the third maximum load factor is combined with the third maximum load factor. Compare three preset thresholds. The third preset threshold is 200%. If the third maximum load rate is greater than or equal to 200%, it will be treated by replacing the high overload distribution transformer or the on-load capacity-adjusting distribution transformer. If the third The maximum value of the load factor is greater than 200%. According to the three-phase current historical data in the special period, the three-phase current imbalance of the distribution transformer is obtained. If the three-phase current imbalance is greater than the fourth preset threshold, The fourth preset threshold is 80%, which can be managed by installing a three-phase unbalanced compliance adjustment device. Otherwise, regulation will suffice.

Among them, the calculation formula of three-phase current unbalance is as follows:

Among them, I _x-min is the minimum value among the A-phase, B-phase and C-phase currents, I _x-max is the maximum value among the A-phase, B-phase and C-phase currents, and Q is the three-phase current unbalance.

It should be noted that when calculating the three-phase current unbalance, the three-phase current unbalance corresponding to each collection time can be calculated by calculating the maximum and minimum values of the three-phase current at each collection time, and then the special period Compare all three-phase current unbalance degrees with the fourth preset threshold. As long as one three-phase current unbalance degree is greater than the fourth preset threshold value, it means that the three-phase current unbalance degree is greater than the fourth preset threshold value. .

It should be noted that the three-phase unbalanced compliance adjusting device is a device that can be controlled based on the three-phase unbalanced compliance adjusting device in the prior art. The specific structure is not specifically limited in this application.

As shown in Figure 2, it is a schematic structural diagram of a distribution transformer heavy overload control device provided by an embodiment of the present invention. The device includes:

The first acquisition module 201 is used to acquire the three-phase current history data of the secondary side of the current transformer;

The second acquisition module 202 is used to acquire the load factor of the distribution transformer according to the three-phase current historical data;

The third acquisition module 203 is used to acquire the heavy overload data of the first target period according to the load rate;

The fourth acquisition module 204 is configured to obtain the heavy overload type in a second target time period based on the heavy overload data, where the duration of the second target time period is greater than the duration of the first target time period;

The management method determination module 205 is used to determine a heavy overload treatment plan for the distribution transformer according to the heavy overload type.

In some embodiments, the second acquisition module is also used to:

Select the three-phase current, current transformer ratio and rated capacity of the distribution transformer within a certain time period to obtain all load factors within the time period, where the length of the time period is less than the first target time period;

Through all the load factors, the average load factor within the time period is obtained, and the average load factor is determined as the load factor of the distribution transformer.

In some embodiments, the second acquisition module is also used to:

Obtain the average value of the three-phase current collected at each moment during the time period;

According to the average value of the three-phase current, the current transformer ratio and the rated capacity of the distribution transformer, the load factor at each moment is obtained;

The load rate at all times in this time period is the load rate at all times in this time period.

In some embodiments, the second acquisition module is also used to:

Obtain the A-phase, B-phase and C-phase currents at each moment during this time period;

According to the A-phase, B-phase and C-phase currents, the current transformer ratio and the rated capacity of the distribution transformer, obtain the corresponding load factors of A-phase, B-phase and C at each moment;

Take the average of the load rates of phase A, phase B and phase C as the load rate at that moment;

The load rate at all times in this time period is the load rate at all times in this time period.

In some embodiments, the third acquisition module is also used to:

Compare the load rate with a first preset threshold, and if the load rate is greater than the first preset threshold, determine that the distribution transformer is heavily overloaded;

Obtain the first duration during which heavy overload occurs within the first target period, compare the first duration with the first duration threshold, and if the first duration is greater than or equal to the first duration threshold, obtain the first target period The first overload data within.

In some embodiments, the third acquisition module is also used to:

Obtain the second duration during which the first heavy overload data occurs within the first target period, compare the second duration with a second duration threshold, and obtain the second duration if the second duration is greater than or equal to the second duration threshold. The second overload data within the first target period, wherein the second duration threshold is greater than the first duration threshold.

In some embodiments, the fourth acquisition module is also used to:

Obtain the third duration during which the second heavy overload data occurs within the second target time period, and compare the third duration with the third duration threshold. If the third duration is greater than or equal to the third duration threshold, then the second The heavy overload and heavy overload within the target time period are the first type of heavy overload and heavy overload, and the third duration threshold is greater than the first duration threshold;

Otherwise, the third duration is compared with the fourth duration threshold. If the third duration is greater than the fourth duration threshold and less than the third duration threshold, then the heavy overload in the second target time period is The second type of heavy overload is 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 device further includes:

The fifth acquisition module is used to obtain the first overload data of a special period. If the first overload data exists in the special period, obtain the third type of heavy overload data in the special period; wherein, the special period Periods include legal holidays, high temperature periods, peak tourist seasons, crop sowing and harvesting times.

In some embodiments, the governance method determination module is also used to:

Screen the first maximum load rate of the distribution transformer within the third period of time, compare the first maximum load rate with a second preset threshold, and if the first maximum load rate is greater than the third 2. Preset thresholds to perform heavy overload management for the first type of heavy overload;

Screen the second maximum load rate of the distribution transformer within the fourth period of time, compare the second maximum load rate with the second preset threshold, and if the second maximum load rate is greater than the second preset threshold, The second preset threshold is used to perform heavy overload management for the second type of heavy overload.

In some embodiments, the governance method determination module is also used to:

Screen the third maximum load factor of the distribution transformer within the special period, and compare the third maximum load factor with a third preset threshold;

If the third maximum load rate is greater than the third preset threshold, a first management method is adopted for the third type of heavy overload and heavy overload;

If the third maximum load factor is less than or equal to the third preset threshold, the three-phase current unbalance degree of the distribution transformer is obtained based on the three-phase current historical data in a special period. If the three-phase current If the degree of imbalance is greater than the fourth preset threshold, the third type of heavy overload and heavy overload are treated in a second management method.

For other details on how each module in the distribution transformer heavy overload control device implements the above technical solution, please refer to the description in the distribution transformer heavy overload control method provided above, and will not be described again here.

In some embodiments, as shown in Figure 3, a schematic structural diagram of a distribution transformer heavy overload control device is provided according to an embodiment of the present invention. The device includes a memory 301 and a processor 302. The memory 301 stores a computer Program, when the computer program is executed by the processor 302, it causes the processor 302 to perform the following steps:

Obtain the three-phase current historical data of the secondary side of the current transformer;

According to the three-phase current historical data, obtain the load factor of the distribution transformer;

According to the load rate, obtain the heavy overload data of the first target period;

According to the heavy overload data, obtain the heavy overload type within a second target time period, where the duration of the second target time period is greater than the duration of the first target time period;

According to the heavy overload type, a heavy overload treatment plan for the distribution transformer is determined.

For other details on how the processor 301 in the distribution transformer heavy overload control equipment implements the above technical solution, please refer to the description in the distribution transformer heavy overload control method provided above, and will not be described again here.

Among them, the processor 302 may also be called a CPU (Central Processing Unit). The processor 302 may be an integrated circuit chip with signal processing capabilities; the processor 302 may also be a general-purpose processor or a DSP (Digital Processing Unit). Signal Process, digital signal processor), ASIC (Application Specific Integrated Circuit, application specific integrated circuit), FPGA (Field Programmable Gata Array, field programmable gate array) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components , where the general processor may be a microprocessor or the processor 302 may also be any conventional processor, etc.

In some embodiments, as shown in Figure 4, which is a schematic structural diagram of a computer-readable storage medium provided by an embodiment of the present invention, a readable computer program 401 is stored on the storage medium; wherein, the computer program 401 can It is stored in the above-mentioned storage medium in the form of a software product and includes a number of instructions to cause a computer device (which can be a personal computer, a service machine, or a network device, etc.) or a processor to perform the following steps:

Obtain the three-phase current historical data of the secondary side of the current transformer;

According to the three-phase current historical data, obtain the load factor of the distribution transformer;

According to the load rate, obtain the heavy overload data of the first target period;

According to the heavy overload data, obtain the heavy overload type within a second target time period, where the duration of the second target time period is greater than the duration of the first target time period;

According to the heavy overload type, a heavy overload treatment plan for the distribution transformer is determined.

The aforementioned storage media include: U disk, mobile hard disk, magnetic disk or optical disk, ROM (Read-Only Memory), RAM (Random Access Memory) and other media that can store program code. , or terminal equipment such as computers, service machines, mobile phones, tablets, etc.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through computer programs. The programs can be stored in a non-volatile computer-readable storage medium. , when the program is executed, it may include the processes of the above-mentioned method embodiments. Any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and/or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous chain Synchlink DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

The technical features of the above embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, all possible combinations should be used. It is considered to be within the scope of this manual.

The above-described embodiments only express several implementation modes of the present application, and their descriptions are relatively specific and detailed, but should not be construed as limiting the patent scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims (13)

1. A method for controlling heavy overload of distribution transformers, characterized in that the method includes: Obtain the three-phase current historical data of the secondary side of the current transformer; According to the three-phase current historical data, obtain the load factor of the distribution transformer; According to the load rate, obtain the heavy overload data of the first target period; According to the heavy overload data, obtain the heavy overload type within a second target time period, where the duration of the second target time period is greater than the duration of the first target time period; According to the heavy overload type, a heavy overload treatment plan for the distribution transformer is determined. 2. The distribution transformer heavy overload control method according to claim 1, characterized in that, obtaining the load factor of the distribution transformer according to the three-phase current historical data includes: Select the three-phase current, current transformer ratio and rated capacity of the distribution transformer within a certain time period to obtain all load factors within the time period, where the length of the time period is less than the first target time period; Through all the load factors, the average load factor within the time period is obtained, and the average load factor is determined as the load factor of the distribution transformer. 3. The distribution transformer heavy overload control method according to claim 2, characterized in that the three-phase current, the current transformer ratio and the rated capacity of the distribution transformer within a certain time period are selected to obtain the time period. All load rates within, including: Obtain the average value of the three-phase current collected at each moment during the time period; According to the average value of the three-phase current, the current transformer ratio and the rated capacity of the distribution transformer, the load factor at each moment is obtained; The load rate at all times in this time period is the load rate at all times in this time period. 4. The distribution transformer heavy overload control method according to claim 2, characterized in that the three-phase current, the current transformer ratio and the rated capacity of the distribution transformer within a certain time period are selected to obtain the time period. All load rates within, including: Obtain the A-phase, B-phase and C-phase currents at each moment during this time period; According to the A-phase, B-phase and C-phase currents, the current transformer ratio and the rated capacity of the distribution transformer, obtain the corresponding load factors of A-phase, B-phase and C at each moment; Take the average of the load rates of phase A, phase B and phase C as the load rate at that moment; The load rate at all times in this time period is the load rate at all times in this time period. 5. The distribution transformer heavy overload control method according to any one of claims 1 or 2, characterized in that, according to the load rate, obtaining the heavy overload data of the first target period includes: Compare the load rate with a first preset threshold, and if the load rate is greater than the first preset threshold, determine that the distribution transformer is heavily overloaded; Obtain the first duration during which heavy overload occurs within the first target period, compare the first duration with the first duration threshold, and if the first duration is greater than or equal to the first duration threshold, obtain the first target period The first overload data within. 6. The distribution transformer heavy overload control method according to claim 5, characterized in that, obtaining the heavy overload data of the first target period according to the load rate further includes: Obtain the second duration during which the first heavy overload data occurs within the first target period, compare the second duration with a second duration threshold, and obtain the second duration if the second duration is greater than or equal to the second duration threshold. The second overload data within the first target period, wherein the second duration threshold is greater than the first duration threshold. 7. The distribution transformer heavy overload control method according to claim 6, characterized in that, according to the heavy overload data, obtaining the heavy overload type in the second target time period includes: Obtain the third duration during which the second heavy overload data occurs within the second target time period, and compare the third duration with the third duration threshold. If the third duration is greater than or equal to the third duration threshold, then the second The heavy overload and heavy overload within the target time period are the first type of heavy overload and heavy overload, and the third duration threshold is greater than the first duration threshold; Otherwise, the third duration is compared with the fourth duration threshold. If the third duration is greater than the fourth duration threshold and less than the third duration threshold, then the heavy overload in the second target time period is The second type of heavy overload is heavy overload; wherein the fourth duration threshold is greater than the second duration threshold and less than the third duration threshold. 8. The distribution transformer heavy overload control method according to claim 7, characterized in that, after obtaining the heavy overload data of the first target period according to the load rate, and obtaining the heavy overload data according to the heavy overload data. The heavy overload type within the second target time period, before the second target time period is longer than the first target time period, the method further includes: Obtain the first overload data of the special period. If the first overload data exists in the special period, obtain the third type of heavy overload data in the special period. The special period includes legal holidays and high temperature periods. , tourist season, crop sowing and harvesting time. 9. The heavy overload treatment method of distribution transformer according to claim 8, characterized in that, determining the heavy overload treatment plan of the distribution transformer according to the heavy overload type includes: Screen the first maximum load rate of the distribution transformer within the third period of time, compare the first maximum load rate with a second preset threshold, and if the first maximum load rate is greater than the third 2. Preset thresholds to perform heavy overload management for the first type of heavy overload; Screen the second maximum load rate of the distribution transformer within the fourth period of time, compare the second maximum load rate with the second preset threshold, and if the second maximum load rate is greater than the second preset threshold, The second preset threshold is used to perform heavy overload management for the second type of heavy overload. 10. The heavy overload treatment method of distribution transformer according to claim 9, characterized in that, determining the heavy overload treatment plan of the distribution transformer according to the heavy overload type further includes: Screen the third maximum load factor of the distribution transformer within the special period, and compare the third maximum load factor with a third preset threshold; If the third maximum load rate is greater than the third preset threshold, a first management method is adopted for the third type of heavy overload and heavy overload; If the third maximum load factor is less than or equal to the third preset threshold, the three-phase current unbalance degree of the distribution transformer is obtained based on the three-phase current historical data in a special period. If the three-phase current If the degree of imbalance is greater than the fourth preset threshold, the third type of heavy overload and heavy overload are treated in a second management method. 11. A heavy overload control device for distribution transformers, characterized in that the device includes: The first acquisition module is used to acquire the three-phase current historical data of the secondary side of the current transformer; The second acquisition module is used to acquire the load factor of the distribution transformer based on the three-phase current historical data; The third acquisition module is used to acquire the heavy overload data of the first target period according to the load rate; A fourth acquisition module, configured to acquire the heavy overload type within a second target time period based on the heavy overload data, where the duration of the second target time period is greater than the duration of the first target time period; A management method determination module is used to determine a heavy overload treatment plan for the distribution transformer according to the heavy overload type. 12. A distribution transformer heavy overload control device, including a memory and a processor, the memory stores a computer program, and when the computer program is executed by the processor, the processor causes the processor to execute claims 1 to 10 The steps of any of the methods. 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 according to any one of claims 1 to 10.