CN102879696B - Automatic judgment method for over-load operational feasibility of transformer - Google Patents
Automatic judgment method for over-load operational feasibility of transformer Download PDFInfo
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- CN102879696B CN102879696B CN201210410842.5A CN201210410842A CN102879696B CN 102879696 B CN102879696 B CN 102879696B CN 201210410842 A CN201210410842 A CN 201210410842A CN 102879696 B CN102879696 B CN 102879696B
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Abstract
The invention relates to an automatic judgment method for over-load operational feasibility of a transformer. The method comprises the following steps of: (1) acquiring meteorological data of an environment where the transformer is positioned, equipment parameters of the transformer and operation state data of the transformer; (2) calculating hot spot temperature of the transformer through a thermal circuit calculation model according to data acquired in the step (1); (3) performing pre-cooling analysis, over-load analysis and radiating analysis on the transformer according to the hot spot temperature of the transformer; (4) acquiring operation current of a switching circuit, performing distribution calculation on the operation current and judging whether switching operation current exceeding an upper limit value exists; (5) analyzing the state of the transformer according to the operation state of the transformer; and (6) judging whether over-load operation of the transformer is feasible according to an analysis result. Compared with the prior art, the method has the advantages of high reliability, capability of effectively solving the problem that whether the transformer in production and scheduling of a power grid is allowed to operate in an over-load state, and the like.
Description
Technical field
The present invention relates to a kind of converting equipment status data disposal route, especially relate to a kind of Automatic judgment method for over-load operational feasibility of transformer.
Background technology
Along with the development of national economy, the contradiction between the development of some areas power supply capacity and the growth of actual demand day by day manifests.For responding actively this situation, the widespread use multinomial technology such as raising running temperature, in short-term dynamic compatibilization, heat resistance circuit in network system, drastically increase the ability to transmit electricity of circuit, power transformation station equipment supporting with it then generally takes technological transformation, namely come to match with circuit transport capacity, to meet power demands to greatest extent by the mode of integral replacing.While obtaining certain effect, a large amount of converting equipment does not reach the time limit and retired in advance designed life, has increased the investment of improvement project newly, and the utilization ratio causing assets declines, and runs converting equipment transformation simultaneously and inevitably has influence on power supply reliability.Therefore, be necessary to judge whether converting equipment running overload is feasible.
Summary of the invention
Object of the present invention be exactly provide to overcome defect that above-mentioned prior art exists a kind of reliability high, effectively can solve electrical network and to produce and in scheduling, whether transformer allows the Automatic judgment method for over-load operational feasibility of transformer of running overload problem.
Object of the present invention can be achieved through the following technical solutions:
A kind of Automatic judgment method for over-load operational feasibility of transformer, described transformer is arranged in transformer station, is also provided with micro weather station and SCADA system in described transformer station, and described transformer is connected with cooling fan, and described method comprises:
1) running state data of the weather data of environment, the device parameter of transformer and transformer residing for transformer is obtained;
2) according to step 1) in obtain data by hot road computation model calculating transformer hot(test)-spot temperature;
3) the precooling analysis of transformer, overload analysis and analysis of heat transmission is carried out respectively according to hot-spot temperature of transformer;
4) obtain the running current of switching circuit, and distribution accounting is carried out to this running current, and judge whether to exist the switch running current exceeding higher limit;
5) analyze according to the state of running state data to transformer of transformer;
6) judge whether transformer overload runs feasible according to above-mentioned analysis result.
Described weather data is provided by micro weather station.
The precooling of described transformer is analyzed specifically: judge in certain hour, whether hot-spot temperature of transformer exceedes preset value, if so, then exports the group number that need increase the cooling fan of transformer, if not, then keeps former running status.
Described certain hour is 900 minutes.
Described overload is analyzed specifically: according to the hot(test)-spot temperature value under certain load factor and the relation between preset value, analyzes the capability of overload of transformer.
Described certain load factor comprises transformer operation can bear maximum load rate or 1.5 times of nominal load rates.
Described analysis of heat transmission is specifically: with the actual thermal resistance of certain frequency calculating transformer, and calculate the rate of change of this actual thermal resistance relative to specified thermal resistance, analyzes the cooling effectiveness of cooling fan, diagnose the operation of current cooling fan according to rate of change.
Described certain frequency be 12 hours once.
The running current of described switching circuit obtains from SCADA system.
Compared with prior art, the present invention passes through running state of transformer data and environment weather data acquisition, transformer is carried out to the analyses such as precooling, overload and heat radiation, and the switch running current be connected with transformer is analyzed, thus automatic decision goes out transformer whether allows running overload, there is high reliability.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the inventive method.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, a kind of Automatic judgment method for over-load operational feasibility of transformer, described transformer is arranged in transformer station, is also provided with micro weather station and SCADA system in described transformer station, described transformer is connected with cooling fan, and described method comprises the following steps:
1) obtain the running state data of the weather data of environment, the device parameter of transformer and transformer residing for transformer, described weather data is provided by micro weather station, and the running state data of described transformer comprises top-oil temperature and load current;
2) according to step 1) in obtain data by hot road computation model calculating transformer hot(test)-spot temperature;
3) the precooling analysis of transformer, overload analysis and analysis of heat transmission is carried out respectively according to hot-spot temperature of transformer:
The precooling of described transformer is analyzed specifically: judge in 900 minutes, whether hot-spot temperature of transformer exceedes preset value, if so, then exports the group number that need increase the cooling fan of transformer, if not, then keeps former running status;
Described overload is analyzed specifically: according to the hot(test)-spot temperature value under certain load factor and the relation between preset value, analyzes the capability of overload of transformer, and certain load factor comprises transformer operation can bear maximum load rate or 1.5 times of nominal load rates;
Described analysis of heat transmission is specifically: with the actual thermal resistance of 12 hours frequency computation part transformers once, and calculate the rate of change of this actual thermal resistance relative to specified thermal resistance, analyze the cooling effectiveness of cooling fan according to rate of change, the operation of current cooling fan is diagnosed;
4) obtain the running current of switching circuit, and carry out distribution accounting to this running current, and judge whether to exist the switch running current exceeding higher limit, the running current of described switching circuit obtains from SCADA system;
5) analyze according to the state of running state data to transformer of transformer;
6) judge whether transformer overload runs feasible according to above-mentioned analysis result, and judge the hazard level that transformer overload runs.
Whether the automatic decision of transformer overload operational feasibility transformer is associated before and after real-time judge overload switching current must exceed the upper bound current value of the permission of switch.Because Divergent line is interrelated, therefore, article one, when the power of circuit changes, need to carry out matching primitives again to all switching currents be associated, the current value of each switch is calculated according to the switching current apportion model after simplification, if the current value of certain switch exceedes higher limit, thinking that switching circuit cannot meet transformer overload and run, as do not exceeded the limits value of switch running current, then allowing overload implementation of strategies.
Claims (6)
1. an Automatic judgment method for over-load operational feasibility of transformer, described transformer is arranged in transformer station, is also provided with micro weather station and SCADA system in described transformer station, and described transformer is connected with cooling fan, it is characterized in that, described method comprises:
1) running state data of the weather data of environment, the device parameter of transformer and transformer residing for transformer is obtained;
2) according to step 1) in obtain data by hot road computation model calculating transformer hot(test)-spot temperature;
3) the precooling analysis of transformer, overload analysis and analysis of heat transmission is carried out respectively according to hot-spot temperature of transformer;
4) obtain the running current of switching circuit, and distribution accounting is carried out to this running current, and judge whether to exist the switch running current exceeding higher limit;
5) analyze according to the state of running state data to transformer of transformer;
6) judge whether transformer overload runs feasible according to above-mentioned analysis result;
The precooling of described transformer is analyzed specifically: judge in certain hour, whether hot-spot temperature of transformer exceedes preset value, if so, then exports the group number that need increase the cooling fan of transformer, if not, then keeps former running status;
Described overload is analyzed specifically: according to the hot(test)-spot temperature value under certain load factor and the relation between preset value, analyzes the capability of overload of transformer;
Described analysis of heat transmission is specifically: with the actual thermal resistance of certain frequency calculating transformer, and calculate the rate of change of this actual thermal resistance relative to specified thermal resistance, analyzes the cooling effectiveness of cooling fan, diagnose the operation of current cooling fan according to rate of change.
2. a kind of Automatic judgment method for over-load operational feasibility of transformer according to claim 1, is characterized in that, described weather data is provided by micro weather station.
3. a kind of Automatic judgment method for over-load operational feasibility of transformer according to claim 1, is characterized in that, described certain hour is 900 minutes.
4. a kind of Automatic judgment method for over-load operational feasibility of transformer according to claim 1, is characterized in that, described certain load factor comprises transformer operation can bear maximum load rate or 1.5 times of nominal load rates.
5. a kind of Automatic judgment method for over-load operational feasibility of transformer according to claim 1, is characterized in that, described certain frequency be 12 hours once.
6. a kind of Automatic judgment method for over-load operational feasibility of transformer according to claim 1, is characterized in that, the running current of described switching circuit obtains from SCADA system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210410842.5A CN102879696B (en) | 2012-10-24 | 2012-10-24 | Automatic judgment method for over-load operational feasibility of transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210410842.5A CN102879696B (en) | 2012-10-24 | 2012-10-24 | Automatic judgment method for over-load operational feasibility of transformer |
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| Publication Number | Publication Date |
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| CN102879696A CN102879696A (en) | 2013-01-16 |
| CN102879696B true CN102879696B (en) | 2015-04-15 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199621B (en) * | 2013-03-07 | 2015-11-11 | 国家电网公司 | The networking of power transformer of intelligent substation on-line monitoring |
| CN103245857B (en) * | 2013-04-23 | 2015-06-03 | 浙江大学 | Assessment method for loadable index of oil immersed power transformer |
| CN103324215B (en) * | 2013-05-17 | 2016-08-03 | 国网河南省电力公司郑州供电公司 | The method to set up of Intelligent load management system for transformer thermal circuit model |
| CN103543352B (en) * | 2013-09-25 | 2016-05-18 | 国家电网公司 | Determine the method for the dynamic overload curve of transformer based on service data |
| CN105353233B (en) * | 2015-09-30 | 2018-03-13 | 南京南瑞继保电气有限公司 | A kind of transformer on-line operation ability detection method and device |
| CN107246925A (en) * | 2017-05-27 | 2017-10-13 | 上海海能信息科技有限公司 | A kind of current transformer thermal circuit model analysis method |
| CN108680801B (en) * | 2018-03-23 | 2020-10-09 | 国网河北省电力有限公司电力科学研究院 | Transformer overload calculation method and system and terminal equipment |
| CN112615371B (en) * | 2020-12-18 | 2021-10-08 | 浙江大学 | Asset optimal configuration method for improving utilization efficiency of distribution transformer |
| CN113390461A (en) * | 2021-06-04 | 2021-09-14 | 广西电网有限责任公司北海供电局 | Transformer dynamic capacity increasing system based on transformer monitoring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202167322U (en) * | 2011-07-20 | 2012-03-14 | 上海海能信息科技有限公司 | Control system of energy-saving and synergistic transformer |
| CN202362395U (en) * | 2011-10-28 | 2012-08-01 | 华东电力试验研究院有限公司 | Real-time analysis system for overload capacity of transformer |
| CN202362089U (en) * | 2011-12-05 | 2012-08-01 | 华东电力试验研究院有限公司 | Overload pre-warning system for transformer |
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