CN110867829A - Distribution transformer protection measurement and control device based on transformer overload capacity protection - Google Patents
Distribution transformer protection measurement and control device based on transformer overload capacity protection Download PDFInfo
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- CN110867829A CN110867829A CN201911025017.1A CN201911025017A CN110867829A CN 110867829 A CN110867829 A CN 110867829A CN 201911025017 A CN201911025017 A CN 201911025017A CN 110867829 A CN110867829 A CN 110867829A
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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
- H02H7/04—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 transformers
- H02H7/045—Differential protection of transformers
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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Abstract
The invention discloses a distribution transformer protection measurement and control device based on transformer overload capacity allowance protection, which comprises a main unit and a plurality of sub-units, wherein the main unit is arranged at a distribution transformer, the sub-units are respectively arranged at distribution transformer low-voltage outgoing lines, the main unit comprises a data acquisition module, the data acquisition module is used for acquiring distribution load current, each sub-unit comprises a current acquisition module, the current acquisition module is used for acquiring each low-voltage outgoing line current, the main unit also comprises a processor, the processor adopts an energy integration overload protection algorithm, whether the current distribution transformer operation exceeds the distribution overload capacity allowance or not is judged according to the distribution load current, if the current distribution transformer operation exceeds the distribution overload capacity allowance, the main unit selectively sends a tripping instruction to the sub-units according to each low-voltage outgoing line current acquired by the sub-units, and the sub-units are. The invention utilizes the energy integral overload protection algorithm to ensure power supply to the maximum extent under the condition of not influencing the service life of the distribution transformer, thereby realizing the overload protection of the distribution transformer.
Description
Technical Field
The invention relates to the field of distribution transformer overload protection, in particular to a distribution transformer protection measurement and control device based on transformer overload capacity protection permission.
Background
The overload protection of the existing distribution transformer is divided into the protection of a medium-voltage side and the protection of a low-voltage side. The distribution transformer overload protection of the medium-voltage side is commonly realized by a high-voltage fuse and a breaker with microcomputer protection. The overload protection of the distribution transformer at the low-voltage side is realized by a low-voltage fuse (sheet), a low-voltage circuit breaker based on a bimetallic heating principle, a low-voltage circuit breaker configured with a controller and the like.
The main drawbacks of overload protection by high voltage fuses and low voltage fuses are:
(1) the principle and the characteristic of the fuse determine that the action of the fuse is not sensitive and rapid;
(2) the quality problem of the fuse wire frequently emerges, the fuse wire often shows great dispersity in the inspection of ampere-second characteristics, and the fuse wire still can not be fused for a long time when exceeding the limit value and time requirements or can be fused in advance when being lower than the limit requirements, so that the reliable protection of the overload problem of the distribution transformer is difficult to realize;
the main drawbacks of the overload protection of low-voltage circuit breakers by the bimetal heating principle are:
(1) the principle and the characteristic of the heating of the bimetallic strip determine that the bimetallic strip is unsettlable, and is not sensitive and rapid in action;
(2) the bimetallic strip often shows great dispersion in the action characteristic test, still does not act for a long time when exceeding the limit value and time requirement or acts in advance when being lower than the limit requirement, and is difficult to realize reliable protection to the distribution transformer overload problem;
the main drawbacks of low-voltage circuit breakers, either protected by a configuration microcomputer or provided with a controller, are:
the overcurrent protection constant value of the distribution transformer is generally realized according to fixed multiples (such as 2 times and 1.2 times) of the rated current of the distribution transformer, the protection action time is second-level (such as 0.3 second and 60S), the overload protection action is accurate, but the characteristic of the protection action cannot be matched with the allowable overload capacity of the distribution transformer.
At present, overload protection of all distribution transformers in the market cannot be effectively matched with the allowable overload capacity of a distribution transformer, so that the distribution transformer is subjected to protection tripping before the allowable overload capacity is not exceeded or is not tripped after the allowable overload capacity is exceeded, the allowable overload capacity of the distribution transformer cannot be scientifically and reasonably utilized, the asset utilization efficiency is improved, the transformer cannot be scientifically and reasonably protected, and burning loss of the distribution transformer caused by overload is prevented.
Disclosure of Invention
The invention provides a distribution transformer protection measurement and control device based on transformer overload capacity protection, which utilizes an energy integral overload protection algorithm to guarantee power supply to the maximum extent under the condition of not influencing the service life of a distribution transformer and realizes the overload protection of the distribution transformer.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the utility model provides a distribution transformer protection measurement and control device based on transformer allows overload capacity protection, includes main unit and a plurality of subelements, and the main unit is installed in distribution transformer department, and a plurality of subelements are installed respectively and are being qualified for the next round of competitions in distribution transformer low pressure and locate, the main unit includes the data acquisition module, and the data acquisition module is used for acquireing distribution load current, and every subelement includes the current acquisition module, and the current acquisition module is used for acquireing each low pressure electric current of being qualified for the next round of competitions, the main unit still includes the treater, the treater adopts energy integration overload protection algorithm, judges whether current distribution transformer operation surpasss the allowable overload capacity of distribution according to distribution load current, if surpasses, then according to each low pressure electric current that the subelement acquireed.
Preferably, the main unit and the plurality of sub-units are both designed in a modular mode by adopting 35mm standard guide rail electrical boxes, and the main unit and the plurality of sub-units have the advantages of being simple to install and flexible in configuration.
Preferably, the main unit and the plurality of sub units are in communication connection by using RS485 or Zigbee.
Preferably, the main unit is connected with a circuit breaker, and when the current distribution transformer of the main unit exceeds the allowable overload capacity of power distribution, the main unit controls the circuit breaker to be disconnected to realize overload protection of the medium-voltage side or the low-voltage side of the distribution transformer.
Preferably, the data acquisition module further acquires a distribution transformation internal temperature and an ambient temperature.
Preferably, when the distribution transformer is a dry-type transformer, the internal temperature of the distribution transformer acquired by the data acquisition module is the core operating temperature of the dry-type transformer, and when the distribution transformer is an oil-immersed transformer, the internal temperature of the distribution transformer acquired by the data acquisition module is the oil temperature of the oil-immersed transformer and also acquires the oil level and the gas pressure in the oil-immersed transformer.
Preferably, the energy integration overload protection algorithm sets an energy integration value, the energy integration value increases when the distribution load current exceeds the rated current, the energy integration value decreases when the distribution load current returns to below the rated current, and the energy integration value is changed to eliminate the influence of overload and is performed again after being smaller than a certain value. And the energy integral overload protection algorithm accumulates the load current of the transformer according to time, and when the energy integral value is larger than the current allowable overload capacity of the transformer, a tripping command is sent out, and the overload protection algorithm is delayed for a period of time and then is coincided. The current allowable overload capacity of the transformer is obtained by correcting according to the design index of the allowable overload capacity of the transformer and combining various factors such as the load condition before the current exceeds the rated value, the ambient temperature, the internal temperature of the transformer, the temperature rise rate and the like, so that the power supply is ensured to the maximum extent under the condition of not influencing the service life of the distribution transformer.
Preferably, the energy integration overload protection algorithm includes obtaining a distribution transformation allowable overload time curve, specifically:
s01: reading the current of the main incoming line of the power distribution, judging whether the current of the main incoming line of the power distribution exceeds rated current, if so, carrying out overload alarm and setting the load coefficient before overload to be 1, entering step S05, and if not, entering step S02;
s02: recording the current value, and reading the current of the main power distribution inlet wire;
s03: if the current main power distribution inlet current exceeds the rated current, the step S04 is carried out, and if not, the step S02 is carried out;
s04: calculating a load coefficient before overload;
s05: and acquiring a distribution transformer allowable overload time curve according to the load coefficient before overload and the distribution transformer model.
Preferably, the load factor calculation formula is as follows:
the load factor is the total line current/rated current.
Preferably, the energy integration overload protection algorithm has a specific flow as follows:
s10: initializing an energy integral value;
s11: if the current total incoming line current exceeds the rated current, the step S12 is carried out, if not, the negative energy integration is carried out, and the step S15 is carried out;
s12: whether the internal temperature of the transformer exceeds an allowable temperature or a temperature rise rate set value or not is judged, if yes, the step S13 is carried out, if not, positive energy integration is carried out, and the step S16 is carried out;
s13: the selected sub-unit trips, and the time delay ensures that the switch trips;
s14: acquiring the current total incoming line current, and returning to the step S10;
s15: if the capacity integration value is smaller than the set value, the process proceeds to step S02; if not, go to step S16;
s16: correcting the current allowable overload capacity of the distribution transformer according to the environment temperature, the internal temperature of the transformer and the temperature rise rate;
s17: if the energy integration value exceeds the current allowable overload capacity, the process proceeds to step S13, otherwise, the process proceeds to step S14.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
1. the load can be quickly cut off when the load rate exceeds the bearing capacity range of the distribution transformer, so that the distribution transformer is protected from irreversible internal insulation damage, and permanent faults are avoided. High reliability and good ampere-second characteristic, and solves the problem of permanent damage of distribution transformation possibly caused by the action dispersion of the fuse.
2. After the overload protection action removes the load, the controller sends a closing instruction to the mechanism again through a set time interval, and closing trial delivery is carried out, so that the long-time power failure caused by manual power restoration and the workload and safety risk of on-site emergency repair are avoided.
3. The protection device can protect distribution transformer overload and short-circuit fault, is quick in mechanism action, is suitable for multi-level differential protection, and meets the development requirements of the intelligent power grid.
4. The logic of the controller can be edited, and the controller can be upgraded according to requirements at the later stage, so that the adaptability is high.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of an energy-integrating overload protection algorithm according to the present invention.
Fig. 3 is a schematic diagram of a short term overload operating condition of a 10 kv oil filled distribution transformer.
Fig. 4 is a schematic diagram of an example of the distribution short-term overload allowable operation time of the load factor of 0.7 at the ambient temperature of 20 ℃.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The embodiment provides a distribution transformer protection measurement and control device based on transformer overload capacity allowance protection, including the main unit, the main unit is installed in distribution transformer department, the main unit includes the data acquisition module, and the data acquisition module is used for acquireing distribution load current, the main unit still includes the treater, the treater adopts energy integration overload protection algorithm, judges whether current distribution transformer operation surpasses distribution's allowable overload capacity according to distribution load current, the main unit all adopts 35mm standard guide rail electrical apparatus box, modularized design with a plurality of subelements.
The main unit is connected with the circuit breaker, and when the current distribution transformer operation of the main unit exceeds the allowable overload capacity of power distribution, the main unit controls the circuit breaker to be disconnected to realize overload protection of a medium-voltage side or a low-voltage side of the distribution transformer.
The data acquisition module also acquires the internal temperature and the ambient temperature of the distribution transformer.
When the distribution transformer becomes the dry-type transformer, the internal temperature of the distribution transformer acquired by the data acquisition module is the iron core operating temperature of the dry-type transformer, and when the distribution transformer becomes the oil-immersed type transformer, the internal temperature of the distribution transformer acquired by the data acquisition module is the oil temperature of the oil-immersed type transformer and also acquires the oil level and the gas pressure in the oil-immersed type transformer.
The energy integral overload protection algorithm sets an energy integral value, the energy integral value is increased when the distribution load current exceeds the rated current, the energy integral value is reduced when the distribution load current is recovered to be below the rated current, and the distribution transformer eliminates the overload influence and performs energy integral again when the energy integral value is smaller than a certain numerical value.
The energy integration overload protection algorithm includes obtaining a distribution transformation allowable overload time curve, as shown in fig. 2, specifically:
s01: reading the current of the main incoming line of the power distribution, judging whether the current of the main incoming line of the power distribution exceeds rated current, if so, carrying out overload alarm and setting the load coefficient before overload to be 1, entering step S05, and if not, entering step S02;
s02: recording the current value, and reading the current of the main power distribution inlet wire;
s03: if the current main power distribution inlet current exceeds the rated current, the step S04 is carried out, and if not, the step S02 is carried out;
s04: calculating a load coefficient before overload;
s05: and acquiring a distribution transformer allowable overload time curve according to the load coefficient before overload and the distribution transformer model.
The load factor calculation formula is as follows:
the load factor is the total line current/rated current.
As shown in fig. 3, when the initial load factor of the transformer before overload is 0.7 and the ambient temperature is 20 ℃, the transformer is allowed to operate continuously for 4 hours under the condition of 1.25 times of overload, for 2 hours under the condition of 1.41 times of overload, for 1 hour under the condition of 1.6 times of overload, and for 0.5 hour under the condition of 1.8 times of overload, under the above conditions, the service life of the transformer is not affected, and the distribution transformer is not burnt out. The bar graph is shown in FIG. 4.
The specific flow of the energy integration overload protection algorithm is as follows:
s10: initializing an energy integral value;
s11: if the current total incoming line current exceeds the rated current, the step S12 is carried out, if not, the negative energy integration is carried out, and the step S15 is carried out;
s12: whether the internal temperature of the transformer exceeds an allowable temperature or a temperature rise rate set value or not is judged, if yes, the step S13 is carried out, if not, positive energy integration is carried out, and the step S16 is carried out;
s13: the selected sub-unit trips, and the time delay ensures that the switch trips;
s14: acquiring the current total incoming line current, and returning to the step S10;
s15: if the capacity integration value is smaller than the set value, the process proceeds to step S02; if not, go to step S16;
s16: correcting the current allowable overload capacity of the distribution transformer according to the environment temperature, the internal temperature of the transformer and the temperature rise rate;
s17: if the energy integration value exceeds the current allowable overload capacity, the process proceeds to step S13, otherwise, the process proceeds to step S14.
Example 2
The embodiment provides a distribution transformer protection measurement and control device based on transformer allows overload capacity protection, as shown in fig. 1, including main unit and a plurality of subelements, the main unit is installed in distribution transformer department, and a plurality of subelements are installed respectively in distribution transformer low voltage and are qualified for the next round of competitions the department, the main unit includes the data acquisition module, and the data acquisition module is used for acquireing distribution load current, and every subelement includes the current acquisition module, and the current acquisition module is used for acquireing each low voltage outgoing line electric current, the main unit still includes the treater, the treater adopts energy integration overload protection algorithm, judges whether current distribution transformer operation surpasss distribution transformer allows overload capacity, if surpass, then according to each low voltage outgoing line electric current that the subelement acquireed, the main unit selectively sends trip instruction to the subelement, and.
The main unit and the plurality of sub-units are both designed in a modularized mode by adopting 35mm standard guide rail electrical boxes.
And the main unit and the plurality of sub units are in communication connection by adopting RS485 or Zigbee.
The main unit is connected with the circuit breaker, and when the current distribution transformer operation of the main unit exceeds the allowable overload capacity of power distribution, the main unit controls the circuit breaker to be disconnected to realize overload protection of a medium-voltage side or a low-voltage side of the distribution transformer.
The data acquisition module also acquires the internal temperature and the ambient temperature of the distribution transformer.
When the distribution transformer becomes the dry-type transformer, the internal temperature of the distribution transformer acquired by the data acquisition module is the iron core operating temperature of the dry-type transformer, and when the distribution transformer becomes the oil-immersed type transformer, the internal temperature of the distribution transformer acquired by the data acquisition module is the oil temperature of the oil-immersed type transformer and also acquires the oil level and the gas pressure in the oil-immersed type transformer.
The energy integral overload protection algorithm sets an energy integral value, the energy integral value is increased when the distribution load current exceeds the rated current, the energy integral value is reduced when the distribution load current is recovered to be below the rated current, and the distribution transformer eliminates the overload influence and performs energy integral again when the energy integral value is smaller than a certain numerical value.
The energy integration overload protection algorithm includes obtaining a distribution transformation allowable overload time curve, as shown in fig. 2, specifically:
s01: reading the current of the main incoming line of the power distribution, judging whether the current of the main incoming line of the power distribution exceeds rated current, if so, carrying out overload alarm and setting the load coefficient before overload to be 1, entering step S05, and if not, entering step S02;
s02: recording the current value, and reading the current of the main power distribution inlet wire;
s03: if the current main power distribution inlet current exceeds the rated current, the step S04 is carried out, and if not, the step S02 is carried out;
s04: calculating a load coefficient before overload;
s05: and acquiring a distribution transformer allowable overload time curve according to the load coefficient before overload and the distribution transformer model.
The load factor calculation formula is as follows:
the load factor is the total line current/rated current.
The specific flow of the energy integration overload protection algorithm is as follows:
s10: initializing an energy integral value;
s11: if the current total incoming line current exceeds the rated current, the step S12 is carried out, if not, the negative energy integration is carried out, and the step S15 is carried out;
s12: whether the internal temperature of the transformer exceeds an allowable temperature or a temperature rise rate set value or not is judged, if yes, the step S13 is carried out, if not, positive energy integration is carried out, and the step S16 is carried out;
s13: the selected sub-unit trips, and the time delay ensures that the switch trips;
s14: acquiring the current total incoming line current, and returning to the step S10;
s15: if the capacity integration value is smaller than the set value, the process proceeds to step S02; if not, go to step S16;
s16: correcting the current allowable overload capacity of the distribution transformer according to the environment temperature, the internal temperature of the transformer and the temperature rise rate;
s17: if the energy integration value exceeds the current allowable overload capacity, the process proceeds to step S13, otherwise, the process proceeds to step S14.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a distribution transformer protection measurement and control device based on transformer allows overload capacity protection, its characterized in that, includes main unit and a plurality of subelement, and the main unit is installed in distribution transformer department, and a plurality of subelements are installed respectively and are being qualified for the next round of competitions in distribution transformer low pressure and locate, the main unit includes the data acquisition module, and the data acquisition module is used for acquireing distribution load current, and every subelement includes the electric current acquisition module, and the electric current acquisition module is used for acquireing each low pressure electric current of being qualified for the next round of competitions, the main unit still includes the treater, the treater adopts energy integration overload protection algorithm, judges whether current distribution transformer operation surpasses distribution's the allowaning overload capacity according to distribution load current, if surpasses, then according to each low pressure electric current of being qualified.
2. The distribution transformer protection measurement and control device allowing overload capacity protection based on the transformer as claimed in claim 1, wherein the main unit and the plurality of sub units are in a modular design with a standard rail electrical box of 35 mm.
3. The distribution transformer protection measurement and control device allowing overload capacity protection based on a transformer of claim 1, wherein the main unit and the plurality of sub units are in communication connection by RS485 or Zigbee.
4. The distribution transformer protection measurement and control device based on transformer overload capacity allowance protection according to any one of claims 1 to 3, wherein the main unit is connected with a circuit breaker, and when the current distribution transformer operation of the main unit exceeds the overload capacity allowance of power distribution, the main unit controls the circuit breaker to be disconnected to realize overload protection on a medium-voltage side or a low-voltage side of the distribution transformer.
5. The distribution transformer protection measurement and control device allowing overload capacity protection based on the transformer as claimed in claim 1, wherein the data acquisition module is further used for acquiring internal temperature and ambient temperature of the distribution transformer.
6. The distribution transformer protection measurement and control device based on transformer overload capacity protection permission according to claim 5, wherein when the distribution transformer becomes a dry-type transformer, the distribution transformer internal temperature obtained by the data obtaining module is an iron core operation temperature of the dry-type transformer, and when the distribution transformer becomes an oil-immersed type transformer, the distribution transformer internal temperature obtained by the data obtaining module is an oil temperature of the oil-immersed type transformer and also obtains an oil level and a gas pressure in the oil-immersed type transformer.
7. The distribution transformer protection measurement and control device allowing overload capacity protection based on the transformer as claimed in claim 5 or 6, wherein the energy integration overload protection algorithm sets an energy integration value, the energy integration value increases when the distribution load current exceeds the rated current, the energy integration value decreases when the distribution load current returns to the rated current, and the distribution transformer performs the energy integration again to eliminate the influence of overload after the energy integration value is less than a certain value.
8. The distribution transformer protection measurement and control device based on transformer overload capacity allowance protection according to claim 7, wherein the energy integration overload protection algorithm comprises obtaining a distribution transformer overload allowance time curve, specifically:
s01: reading the current of the main incoming line of the power distribution, judging whether the current of the main incoming line of the power distribution exceeds rated current, if so, carrying out overload alarm and setting the load coefficient before overload to be 1, entering step S05, and if not, entering step S02;
s02: recording the current value, and reading the current of the main power distribution inlet wire;
s03: if the current main power distribution inlet current exceeds the rated current, the step S04 is carried out, and if not, the step S02 is carried out;
s04: calculating a load coefficient before overload;
s05: and acquiring a distribution transformer allowable overload time curve according to the load coefficient before overload and the distribution transformer model.
9. The distribution transformer protection measurement and control device based on transformer overload capacity protection permission according to claim 8, wherein the load coefficient calculation formula is as follows:
the load factor is the total line current/rated current.
10. The distribution transformer protection measurement and control device based on transformer overload capacity protection permission according to claim 9, wherein the energy integration overload protection algorithm comprises the following specific flows:
s10: initializing an energy integral value;
s11: if the current total incoming line current exceeds the rated current, the step S12 is carried out, if not, the negative energy integration is carried out, and the step S15 is carried out;
s12: whether the internal temperature of the transformer exceeds an allowable temperature or a temperature rise rate set value or not is judged, if yes, the step S13 is carried out, if not, positive energy integration is carried out, and the step S16 is carried out;
s13: the selected sub-unit trips, and the time delay ensures that the switch trips;
s14: acquiring the current total incoming line current, and returning to the step S10;
s15: if the capacity integration value is smaller than the set value, the process proceeds to step S02; if not, go to step S16;
s16: correcting the current allowable overload capacity of the distribution transformer according to the environment temperature, the internal temperature of the transformer and the temperature rise rate;
s17: if the energy integration value exceeds the current allowable overload capacity, the process proceeds to step S13, otherwise, the process proceeds to step S14.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111327021A (en) * | 2020-03-31 | 2020-06-23 | 广东中鹏电气有限公司 | Overload protection method for high-overload transformer |
| CN117578738A (en) * | 2024-01-15 | 2024-02-20 | 广州南网科研技术有限责任公司 | Distribution transformer overload operation monitoring method and related equipment |
| CN117578738B (en) * | 2024-01-15 | 2024-05-17 | 广州南网科研技术有限责任公司 | Distribution transformer overload operation monitoring method and related equipment |
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| CN117578738B (en) * | 2024-01-15 | 2024-05-17 | 广州南网科研技术有限责任公司 | Distribution transformer overload operation monitoring method and related equipment |
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