CN203632220U - Over-heating protection device for ventilation circuit of main transformer - Google Patents
Over-heating protection device for ventilation circuit of main transformer Download PDFInfo
- Publication number
- CN203632220U CN203632220U CN201320780777.5U CN201320780777U CN203632220U CN 203632220 U CN203632220 U CN 203632220U CN 201320780777 U CN201320780777 U CN 201320780777U CN 203632220 U CN203632220 U CN 203632220U
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- China
- Prior art keywords
- main transformer
- relay
- motor
- coil
- normally
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 238000009423 ventilation Methods 0.000 title claims abstract description 16
- 238000013021 overheating Methods 0.000 title abstract description 5
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses an over-heating protection device for a ventilation circuit of a main transformer, and the device comprises a temperature relay and a time relay. The coil of the temperature relay is connected between power supplies of a main transformer loop, thereby forming a first branch circuit. The normally open contact of the temperature relay is in series connection with the coil of the time relay, thereby forming a second branch circuit. The normally open contact of the time relay and the normally open contact of the temperature relay are in parallel connection. The normally closed contact of the temperature relay, the normally closed contact of the time relay and the coil of the main transformer loop are in series connection to form a third branch. The normally closed contact of the coil of the main transformer loop is connected between the power supplies of the main transformer loop, thereby forming a third branch circuit. The device provided by the utility model can control and protect a motor of the ventilation circuit of the main transformer automatically, and solves a problem that the over-heating of the motor causes the damage to the motor. When the temperature of the motor is decreased, the motor is enabled to rotate, thereby protecting the motor.
Description
Technical field
The utility model relates to the main transformer ventilation circuit in electric power system, relates in particular to a kind of main transformer ventilation circuit overtemperature protection system.
Background technology
At present, if the design of a certain transforming plant main transformer ventilation circuit is inferior temperature actuated with active air-cooled control cabinet.55 ° of C of general main transformer oil temperature start, and 45 ° of C stop.In addition present micro-guarantor to have overload to start air-cooled, current ration is all much smaller than rated current, in micro-guarantor, can establish time definite value, it is cold that main transformer electric current is less than after the current ration of setting the time definite value blowing-out through adjusting.These two kinds of modes can be avoided blower fan start-stop frequently.
But in this work, exist many problems:
1, weather reason: because weather is overheated, electrical machine insulation reduces, and motor frequently burns out, and increases repair rate;
2, personnel's waste: maintainer must reach the spot, and this and the integrated general overhaul system of O&M obviously lag behind;
3, the repair time is long: need to handle work permit and termination formality;
4, potential safety hazard is many: maintainer needs on-the-spot which platform motor of confirmation to burn out, and dismounting motor complexity, increases human factor;
5, the limitation of time: motor repair overlong time, increase maintenance cost, affect ventilation and the cooling of main transformer simultaneously, affect the normal operation of main transformer.
Utility model content
The purpose of this utility model is to provide a kind of main transformer ventilation circuit overtemperature protection system, can control protection main transformer ventilation circuit motor overheating phenomenon, can also control protection motor and run well.
The utility model adopts following technical proposals: a kind of main transformer ventilation circuit overtemperature protection system, include temperature relay and the time relay, and the coil of described temperature relay is connected to and between main transformer ring current, forms the first branch road; The coil of the normally opened contact series connection time relay of described temperature relay forms the second branch road, and wherein the normally opened contact of the time relay and the normally opened contact of temperature relay are in parallel; The normally-closed contact of described temperature relay, the normally-closed contact of the time relay and main transformer circuit coil the 3rd branch road in series; The normally-closed contact of described main transformer circuit coil is connected to and between main transformer ring current, forms the 4th branch road.
The set-point of described temperature relay is 70 ℃.
The utility model overtemperature protection system is mainly by temperature relay and the time relay, and energy automatic protection main transformer ventilation circuit motor, has solved motor overheating and caused the problem that motor damages.In the time that motor temperature reduces, then motor is run well, protection motor.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, the utility model discloses a kind of main transformer ventilation circuit overtemperature protection system, include temperature relay and the time relay, the coil WD of described temperature relay is connected to and between main transformer ring current, forms the first branch road; The coil SJ of the normally opened contact WD1 series connection time relay of described temperature relay forms the second branch road, and wherein the normally opened contact WD1 of temperature relay and the normally opened contact SJ2 of the time relay are in parallel; Coil NBC the 3rd branch road in series of the normally-closed contact WD2 of described temperature relay, the normally-closed contact SJ1 of the time relay and main transformer loop contactor; The normally-closed contact NBC-1 of described main transformer loop contactor is connected to and between main transformer ring current, forms the 4th branch road.The set-point of described temperature relay is 70 ℃.
The utility model is to add overtemperature protection system in existing main transformer loop, controls motor temperature superheating phenomenon by often the opening of temperature relay or the time relay, normally closed contact, avoids summer outdoor temperature too high, and motor frequently burns out.Concrete principle is as follows: under normal circumstances, the normally opened contact NBC-1 closure of main transformer loop contactor, motor is normally worked, and in the time that motor temperature reaches 70 ° of C, has reached the set-point of temperature relay, the coil WD of temperature relay action, its normally-closed contact WD2 disconnects, and makes the coil NBC dead electricity of main transformer loop contactor, and the normally opened contact NBC-1 of main transformer loop contactor disconnects, cut off motor power, motor is out of service; In the time of the coil WD of temperature relay action, its normally opened contact WD1 closure, time relay coil SJ obtains electric, the normally opened contact SJ2 closure of the time relay, form self-locking, the normally-closed contact of the time relay disconnected, due to time relay timing one hour, one as a child temperature certainly lower than 70 ° of C, temperature lower than 70 ° of C after the normally-closed contact WD of temperature relay recover closure state; After one hour, the normally-closed contact SJ1 of the time relay recovers closed, the coil NBC of main transformer loop contactor obtain electric, the normally opened contact NBC-1 closure of main transformer loop contactor, electric motor loop is normally worked; SJ2 recovers to disconnect simultaneously, and time relay coil dead electricity is waited for action next time.The utility model can be controlled the problem of at high temperature overheated work of main transformer ventilation circuit motor, in the time that motor temperature reaches 70 ° of C, motor is quit work, protection motor.
Claims (2)
1. a main transformer ventilation circuit overtemperature protection system, is characterized in that: include temperature relay and the time relay, the coil of described temperature relay is connected to and between main transformer ring current, forms the first branch road; The coil of the normally opened contact series connection time relay of described temperature relay forms the second branch road, and wherein the normally opened contact of the time relay and the normally opened contact of temperature relay are in parallel; The normally-closed contact of described temperature relay, the normally-closed contact of the time relay and main transformer circuit coil the 3rd branch road in series; The normally-closed contact of described main transformer circuit coil is connected to and between main transformer ring current, forms the 4th branch road.
2. main transformer ventilation circuit overtemperature protection system according to claim 1, is characterized in that: the set-point of described temperature relay is 70 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320780777.5U CN203632220U (en) | 2013-12-03 | 2013-12-03 | Over-heating protection device for ventilation circuit of main transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320780777.5U CN203632220U (en) | 2013-12-03 | 2013-12-03 | Over-heating protection device for ventilation circuit of main transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203632220U true CN203632220U (en) | 2014-06-04 |
Family
ID=50818662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320780777.5U Expired - Fee Related CN203632220U (en) | 2013-12-03 | 2013-12-03 | Over-heating protection device for ventilation circuit of main transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203632220U (en) |
-
2013
- 2013-12-03 CN CN201320780777.5U patent/CN203632220U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140604 Termination date: 20181203 |