CN105242717A - Automatic switching device of cooling system of main transformer of transformer substation - Google Patents
Automatic switching device of cooling system of main transformer of transformer substation Download PDFInfo
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- CN105242717A CN105242717A CN201510729529.1A CN201510729529A CN105242717A CN 105242717 A CN105242717 A CN 105242717A CN 201510729529 A CN201510729529 A CN 201510729529A CN 105242717 A CN105242717 A CN 105242717A
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Abstract
The invention provides an automatic switching device of a cooling system of a main transformer of a transformer substation. The automatic switching device is composed of a main transformer, an oil pump, a plurality of cooling devices, a PLC controller, a temperature control instrument, a plurality of thermal relays, a plurality of intermediate relays, and a plurality of alternating-current contactors. With symmetric heat radiation, the multiple cooling devices are arranged at the two sides of the main transformer symmetrically and an automatic swathing control way is used, thereby realizing dynamic adjustment of the cooling system of the main transformer and solving a problem of long-term over-temperature running of the main transformer of the power system effectively. Therefore, the oil temperature of the main transformer is kept in a normal working range; the efficiency and stability of running of the main transformer and the cooling system are improved; and the service life of the main transformer and the cooling system are prolonged.
Description
Technical field
The invention belongs to power distribution equipment field of intelligent control, be specifically related to a kind of main transformer of transformer substation cooling system automatic switching device.
Background technology
Along with electrical network power load surge and country to the great attention of power grid construction, power transformer holds the rate of carrying and has reached unprecedented high level, and the frequency more and more higher time that the heavy duty of Load in Summer peak period main-transformer, phenomenon that is fully loaded, that transship often occur and occur is more and more longer.Main-transformer transships the safe operation not only seriously jeopardizing electrical network for a long time, even can be accidents caused, long-term heavy duty, the operation life (6 DEG C of temperature rise rules of main transformer) that fully loaded, overload, overheating operation also can reduce transformer, bring unnecessary economic loss to country and enterprise.
Height and the failure cause of judgement oil temperature that can be rough when transformer station's Attended mode come manual switching blower fan and oil pump; The state that blower fan oil pump is often in running for a long time or stops just being made after transformer station's unmanned.
The support of the modern means such as it is increasingly automated, information-based that what the operation of unmanned substation relied on is, but large-scale unmanned substation domestic at present only carries out automatic switching, stoppage in transit according to temperature of oil in transformer to whole refrigeratory, so first, energy dissipation and blower fan inordinate wear will be caused, secondly cannot realize main-transformer load variations or when the cooling strategy under part Cooler Fault state adjusts automatically, and operation power control center cannot the malfunction of Real-time Obtaining refrigeratory and transformer.
Summary of the invention
In order to make up the deficiencies in the prior art, the invention provides a kind of main transformer of transformer substation cooling system automatic switching device, employing symmetrical expression dispels the heat, some refrigeratorys are symmetricly set on main-transformer both sides, and adopt robotization switching to control, realize the dynamic conditioning of main-transformer cooling system, main-transformer oil temperature can be made to maintain in normal working range, improve efficiency and the stability of the operation of main-transformer cooling system, the serviceable life of main-transformer can be extended.
Technical scheme of the present invention is achieved in the following ways:
Main transformer of transformer substation cooling system automatic switching device, mainly comprises main-transformer, oil pump, some refrigeratorys, PLC, temperature controller, some electrothermal relays, some auxiliary reclays, some A.C. contactors;
Wherein, oil pump is connected to main-transformer outside through oil pipe, and oil pipe two ends connect main fransformer oil box-shaped and become flow cycle; The oil pipe of main-transformer outside is roundabout is arranged at cooler casing inside deviously;
Some refrigeratorys are divided into two groups, and the refrigeratory often in group is all connected in parallel, and these two groups of refrigeratorys are symmetricly set on main-transformer both sides; Each refrigeratory includes fan and fan electromotor, and fan electromotor is connected to three-phase supply through an A.C. contactor; Fan is used for oil cooling service pipe;
Each A.C. contactor is all connected an electrothermal relay, and the auxiliary contact of electrothermal relay are normally off, and are connected on the leading-out terminal of described ac contactor coil;
The normally opened contact of auxiliary reclay is connected in series on ac contactor coil power lead;
Temperature controller comprises temperature sensor and temperature switch, and wherein temperature sensor is for detecting the oil temperature in main-transformer fuel tank, and temperature switch is normally open and is connected in parallel on auxiliary reclay;
Temperature sensor is connected with PLC through A/D change-over circuit; The input end of temperature switch, A.C. contactor, oil pump power switch is all connected with PLC through driving circuit.
Ac contactor coil power supply is single-phase alternating current, and this single-phase alternating current is that ac contactor coil is powered through isolating switch.
Often open node and be connected on respectively on ac contactor coil end of incoming cables and leading-out terminal for two of auxiliary reclay.
The operating temperature of temperature switch is 60 °.
PLC controls startup and the stopping of fan electromotor by A.C. contactor.
As preferably, ac power supply terminal first after three-phase breaker for auxiliary reclay, fan electromotor, A.C. contactor, electrothermal relay, temperature controller provide alternating current.
Further, PLC selects FX2-80MT Programmable Logic Controller, and temperature controller adopts BWY (WTYK)-803ATH, and three-phase breaker model is DZ158-25A, and auxiliary reclay adopts JZ7 type.
The cooling system that the present invention is arranged by symmetrical expression, robotization switching is adopted to control, realize the dynamic conditioning of main-transformer cooling system, main-transformer oil temperature can be made to maintain in normal working range, improve efficiency and the stability of main-transformer cooling system operation.
Accompanying drawing explanation
Fig. 1 is main-transformer effect of symmetrical heat radiation structural representation sketch of the present invention.
Fig. 2 is main-transformer oil circulation passage simplified schematic diagram of the present invention.
Fig. 3 is refrigeratory automatic switching circuit system principle schematic in the present invention.
Fig. 4 is that in Fig. 3, A.C. contactor is connected wiring schematic diagram with electrothermal relay.
In figure: the binding post that the coil that the normally opened contact that ZJ is auxiliary reclay, ZJ1 and ZJ2 is auxiliary reclay, KM1-3 are A.C. contactor, JRS1 is electrothermal relay, JRS1 I-III is thermal relay normally closed contact, XQ is A.C. contactor, A1 and A2 are A.C. contactor binding post, a1 and a2 is auxiliary reclay actuating coil, L1 and L2 and L3 are ac power supply terminal.
Embodiment
See accompanying drawing 1, concrete scheme of the present invention is: electric system as the main-transformer casing external symmetry of transformer station etc. some groups of refrigeratorys are set.If cooler package number is less, then select best to be arranged on the main-transformer shell of main-transformer fuel tank side.Automatically controlled the switching of each group of refrigeratory and stopping by PLC and temperature controller, PLC and temperature controller are all not shown in Figure 1.
As accompanying drawing 1, often organize refrigeratory and can be arranged in same casing or housing.Often organize refrigeratory and at least comprise a fan, can certainly be multiple.When being applied to large-scale main-transformer, fan electromotor adopts three-phase alternating current (380V) power supply.
See accompanying drawing 2, main-transformer fuel tank connects the oil pump of main-transformer casing outside by oil pipe, and the oil pipe other end is connected to main fransformer oil box-shaped again and becomes flow cycle; The oil pipe of main-transformer casing outside is roundabout is arranged at cooler casing inside deviously, arranges towards fan.
For convenience of explanation, the existing situation only arranging two groups of refrigeratorys using main-transformer is introduced as follows as embodiment.In this example, often organize refrigeratory and comprise 3 fans.Certainly the symmetrically arranged often fan organized in refrigeratory can be two or more, and often the number of fans organized in refrigeratory not necessarily requires identical.
As accompanying drawing 3 and accompanying drawing 4, this two width figure briefly illustrates the electrical schematic diagram of one group of (namely main-transformer is one-sided) refrigeratory automatic switching system.The connection principle of the essential electrical parts realized needed for the most basic embodiment of the present invention is illustrate only in figure.
In accompanying drawing 3, ac power supply terminal L1, L2, L3 first after three-phase breaker DZ for the parts such as auxiliary reclay, fan electromotor, A.C. contactor, electrothermal relay, temperature controller provide alternating current.
The fan electromotor of each fan is connected to three-phase supply (380V) through an A.C. contactor KM (1-3).Each A.C. contactor KM all connects an electrothermal relay JRS1.The auxiliary contact (JRS1 I-III) of electrothermal relay JRS1 are normally off, and are connected on the leading-out terminal of the coil XQ of described A.C. contactor KM; So-called leading-out terminal, the A2 binding post namely in accompanying drawing 3, on the contrary, in Fig. 3, A1 binding post is called end of incoming cables.Electrothermal relay JRS1 is set in the present embodiment, mainly in order to available protecting motor is under open-phase running status, protects from the power supply of respective fans motor that fan electromotor is unlikely to be burned.
A.C. contactor KM and electrothermal relay JRS1 is powered by single-phase alternating current.On the end of incoming cables that normally opened contact ZJ1, ZJ2 of an intermediate relay ZJ are connected in series in ac contactor coil XQ respectively and leading-out terminal.
The present invention is also provided with temperature controller at main-transformer casing, and temperature controller comprises temperature sensor and temperature switch K2, and wherein temperature sensor is for detecting the oil temperature in main-transformer fuel tank, and temperature switch K2 is normally open and is connected in parallel in intermediate relay ZJ.Specifically as shown in Figure 3, access from three-phase breaker DZ a phase supply terminals L3 to be connected to the actuating coil of intermediate relay ZJ a1 binding post through the normally opened contact of the temperature switch K2 of temperature controller, the a2 binding post power supply of the actuating coil of intermediate relay ZJ is introduced from another phase supply terminals L1 of three-phase breaker DZ.
The present invention uses programmable logic controller (PLC) PLC to realize automatic switching and the stopping of each cooler package.Wherein, the output of temperature sensor is connected with PLC through A/D change-over circuit; The input end of temperature switch K2, A.C. contactor KM, oil pump power switch is all connected with PLC through driving circuit.
According to the requirement of main-transformer standard oil temperature, the operating temperature of temperature switch K2 (often opening) is set as 60 °.When the temperature signal that temperature sensor detects in real time reaches 60 °, PLC sends instruction, the normally opened contact of temperature switch K2 is closed, thus startup intermediate relay ZJ, after normal opened contact ZJ1, ZJ2 of auxiliary reclay are closed, A.C. contactor KM will connect three-phase alternating-current supply, thus start fan motor runs.This group refrigeratory completes automatic switching.
More specifically, in above-described embodiment, PLC selects FX2-80MT Programmable Logic Controller, and temperature controller adopts BWY (WTYK)-803ATH, and three-phase breaker model is DZ158-25A, and auxiliary reclay adopts JZ7 type.
During actual use, as for seasonal peak of power consumption, regular every day peak of power consumption, the situation that main-transformer load increases, state on the invention on the basis of embodiment, those skilled in the art can programme to PLC as required, select each group of refrigeratory fan all to work or the fan work of specific quantity, effectively can solve the problem of the long-term heavy duty of main-transformer, fully loaded, overload, overheating operation.Can also by setting, often the specific fan organized in refrigeratory carries out switching cycle in special time, so a part of fan work, another part fan are as subsequent use, the long-term full load of fan electromotor can be avoided to run, effectively reduce the failure rate of fan electromotor, also can extend the serviceable life of fan electromotor.
Structure of the present invention is simple, controls flexibly, effectively can solve the problem of the long-term overheating operation of electric system main-transformer and cooling system automatic switching, intelligent operation/cutting.With low cost, cooling effect and the protected effect to main-transformer are given prominence to, and can extend the serviceable life of main-transformer, and therefore economic effect is also very remarkable.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; make some equivalent alternative or obvious modification without departing from the inventive concept of the premise; and performance or purposes identical, all should be considered as belonging to the scope of patent protection that the present invention is determined by submitted to claims.
Claims (7)
1. main transformer of transformer substation cooling system automatic switching device, mainly comprises main-transformer, oil pump, some refrigeratorys, PLC, temperature controller, some electrothermal relays, some auxiliary reclays, some A.C. contactors;
It is characterized in that,
Oil pump is connected to main-transformer outside through oil pipe, and oil pipe two ends connect main fransformer oil box-shaped and become flow cycle; The oil pipe of main-transformer outside is roundabout is arranged at cooler casing inside deviously;
Some refrigeratorys are divided into two groups, and the refrigeratory often in group is all connected in parallel, and these two groups of refrigeratorys are symmetricly set on main-transformer both sides; Each refrigeratory includes fan and fan electromotor, and fan electromotor is connected to three-phase supply through an A.C. contactor; Fan is used for oil cooling service pipe;
Each A.C. contactor is all connected an electrothermal relay, and the auxiliary contact of electrothermal relay are normally off, and are connected on the leading-out terminal of described ac contactor coil;
The normally opened contact of auxiliary reclay is connected in series on ac contactor coil power lead;
Temperature controller comprises temperature sensor and temperature switch, and wherein temperature sensor is for detecting the oil temperature in main-transformer fuel tank, and temperature switch is normally open and is connected in parallel on auxiliary reclay;
Temperature sensor is connected with PLC through A/D change-over circuit; The input end of temperature switch, A.C. contactor, oil pump power switch is all connected with PLC through driving circuit.
2. main transformer of transformer substation cooling system automatic switching device according to claim 1, is characterized in that: ac contactor coil power supply is single-phase alternating current, and this single-phase alternating current is that ac contactor coil is powered through isolating switch.
3. main transformer of transformer substation cooling system automatic switching device according to claim 1, is characterized in that: often open node and be connected on respectively on ac contactor coil end of incoming cables and leading-out terminal for two of auxiliary reclay.
4. main transformer of transformer substation cooling system automatic switching device according to claim 1, is characterized in that: the operating temperature of temperature switch is 60 °.
5. main transformer of transformer substation cooling system automatic switching device according to claim 1, is characterized in that: PLC controls startup and the stopping of fan electromotor by A.C. contactor.
6. main transformer of transformer substation cooling system automatic switching device according to claim 1, is characterized in that: ac power supply terminal first after three-phase breaker for auxiliary reclay, fan electromotor, A.C. contactor, electrothermal relay, temperature controller provide alternating current.
7. the main transformer of transformer substation cooling system automatic switching device according to any one of claim 1-6, it is characterized in that: PLC selects FX2-80MT Programmable Logic Controller, temperature controller adopts BWY (WTYK)-803ATH, three-phase breaker model is DZ158-25A, and auxiliary reclay adopts JZ7 type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510729529.1A CN105242717A (en) | 2015-10-31 | 2015-10-31 | Automatic switching device of cooling system of main transformer of transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510729529.1A CN105242717A (en) | 2015-10-31 | 2015-10-31 | Automatic switching device of cooling system of main transformer of transformer substation |
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| CN105242717A true CN105242717A (en) | 2016-01-13 |
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| CN201510729529.1A Pending CN105242717A (en) | 2015-10-31 | 2015-10-31 | Automatic switching device of cooling system of main transformer of transformer substation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107168287A (en) * | 2017-05-26 | 2017-09-15 | 中国南方电网有限责任公司超高压输电公司贵阳局 | A kind of PLC failures based on PLC transformer cooler control systems are met an urgent need module |
| CN107450458A (en) * | 2017-07-28 | 2017-12-08 | 陕西金源自动化科技有限公司 | A kind of energy saving transformer cooler switch board and its control method |
| CN109814633A (en) * | 2017-11-20 | 2019-05-28 | 国网内蒙古东部电力有限公司电力科学研究院 | A kind of extra-high voltage transformer cooler control circuit and its control method |
| CN109814633B (en) * | 2017-11-20 | 2024-05-31 | 国网内蒙古东部电力有限公司电力科学研究院 | Extra-high voltage transformer cooler control circuit and control method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107168287A (en) * | 2017-05-26 | 2017-09-15 | 中国南方电网有限责任公司超高压输电公司贵阳局 | A kind of PLC failures based on PLC transformer cooler control systems are met an urgent need module |
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| CN109814633A (en) * | 2017-11-20 | 2019-05-28 | 国网内蒙古东部电力有限公司电力科学研究院 | A kind of extra-high voltage transformer cooler control circuit and its control method |
| CN109814633B (en) * | 2017-11-20 | 2024-05-31 | 国网内蒙古东部电力有限公司电力科学研究院 | Extra-high voltage transformer cooler control circuit and control method thereof |
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Application publication date: 20160113 |