CN216381949U

CN216381949U - Dry-type transformer cooling blower control system

Info

Publication number: CN216381949U
Application number: CN202122762980.7U
Authority: CN
Inventors: 李念知; 王志斌; 陈章; 杭云
Original assignee: Ma'anshan Dangtu Power Generation Co ltd
Current assignee: Ma'anshan Dangtu Power Generation Co ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-04-26
Anticipated expiration: 2031-11-11

Abstract

The utility model discloses a cooling fan control system of a dry-type transformer, and relates to the technical field of transformer cooling. The control system comprises a cooling fan unit consisting of a plurality of cooling fans, wherein the cooling fan unit is arranged beside a dry-type transformer; the method is characterized in that: each cooling fan is connected to the main control unit through a corresponding sub-control switch; the main control unit comprises a primary circuit and a secondary circuit, the secondary circuit comprises a dry-type variable temperature controller and an alternating current contactor coil communicated with the dry-type variable temperature controller, and the alternating current contactor coil is connected with an alternating current contactor contact in the primary circuit to control the on-off of the alternating current contactor coil. According to the control system, the temperature controller in the control circuit is separated from the main circuit, and the temperature controller is used for controlling whether the coil of the alternating current contactor is electrified or not so as to control the on-off of the primary circuit, so that the through-flow flux of the whole circuit is increased, the operation is stable, and the service lives of the dry-type transformer and the temperature controller are effectively ensured.

Description

Dry-type transformer cooling blower control system

Technical Field

The utility model relates to the technical field of transformer cooling, in particular to a cooling fan control system of a dry-type transformer.

Background

The dry type transformer is a core device of a low-voltage power supply system, is widely applied to the low-voltage power supply system due to small occupied area and low maintenance cost, and the quality of the operation condition of the dry type transformer is closely related to the safe operation of electric equipment. When the dry-type transformer operates, the ferromagnetic material and the coil generate heat due to copper loss and iron loss, the temperature of the transformer coil rises and the like, and the insulating layer is aged after being heated for a long time, so that the service life, the mechanical strength, the load capacity and the service life of the insulating material of the transformer are directly influenced. Therefore, the cooling fan of the dry-type transformer is one of important auxiliary cooling and heat dissipation equipment of the transformer, is arranged at the bottom of the coil of the dry-type transformer, and reduces the temperature generated in the operation of the dry-type transformer through the cooling fan, so as to ensure the safe, stable, economic and reliable operation of the dry-type transformer.

The existing dry type transformer cooling fan control circuit directly outputs power to the cooling fans connected in parallel only through a dry type temperature controller, so as to achieve the purpose of controlling the dry type transformer cooling fans. Under the control mode, when a large short circuit or overload current occurs in a circuit, the dry-type temperature change controller is easily burnt out, and the fault caused by which cooling fan cannot be quickly judged, so that the equipment maintenance time is prolonged. In addition, in the mode, protection is only configured on the main loop, and protection is not configured on each branch, so that all cooling fans arranged at the bottom of the dry-type transformer are shut down due to the fact that a certain cooling fan fails in actual operation, the dry-type transformer loses the source of the cooling air, the safety and the reliability of the operation of the dry-type transformer are greatly reduced, and the dry-type transformer is burnt in severe cases.

Disclosure of Invention

1. Technical problem to be solved by the utility model

In view of the problems that when a large short circuit or overload current occurs in the existing transformer cooling fan control circuit, the dry type temperature change controller is easy to burn out, and the fault caused by which cooling fan cannot be quickly judged, the utility model provides a dry type transformer cooling fan control system.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the utility model is as follows:

the utility model relates to a cooling fan control system of a dry-type transformer, which comprises a cooling fan unit consisting of a plurality of cooling fans, wherein the cooling fan unit is arranged beside the dry-type transformer; each cooling fan is connected to the main control unit through a corresponding sub-control switch; the main control unit comprises a primary circuit and a secondary circuit, the secondary circuit comprises a dry-type variable temperature controller and an alternating current contactor coil communicated with the dry-type variable temperature controller, and the alternating current contactor coil is in electromagnetic contact with an alternating current contactor contact in the primary circuit to control the on-off of the alternating current contactor coil.

Furthermore, the dry-type temperature-changing controller is electrically connected with a temperature sensor, the temperature sensor is arranged on the dry-type transformer and used for detecting the three-phase temperature of the dry-type transformer, and the dry-type temperature-changing controller controls the on-off of the circuit according to the temperature.

Furthermore, a main control switch is arranged in the primary circuit and is arranged between the incoming line power supply and the contact of the alternating current contactor.

Furthermore, the plurality of sub-control switches jointly form a sub-control unit, and the sub-control unit is jointly connected to a primary circuit through a sub-control circuit.

Furthermore, the main control switch and the sub-control switch are three-pole air switches.

Furthermore, in the secondary circuit, a bipolar switch is arranged between the dry type temperature change controller and the control power supply.

Furthermore, the incoming line power supply uses a three-phase four-wire alternating current power supply, and the voltage is 380V; the control power supply uses a single-phase alternating current power supply and has the voltage of 220V.

Furthermore, the cooling fans are provided with 6 groups, and 6 sub-control switches are arranged in total.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) in view of the problems that when the existing transformer cooling fan control circuit has a large short circuit or overload current, the dry-type temperature controller is easy to burn out, and the fault caused by which cooling fan cannot be quickly judged, the dry-type transformer cooling fan control system provided by the utility model has the advantages that the temperature controller in the control circuit is separately arranged from the main circuit, the temperature controller is used for controlling whether the coil of the alternating current contactor is electrified or not, so that the on-off of the primary circuit is controlled, the through-flow flux of the whole circuit is increased, the operation is stable, and the service lives of the dry-type transformer and the temperature controller are effectively ensured.

(2) According to the control system for the cooling fan of the dry-type transformer, each cooling fan is controlled by the branch control circuit and the branch switch, when a fault occurs, the branch main protection acts preferentially to cut off the circuit of the fault part, the cooling fan which does not have the fault continues to operate, the risk that the cooling fan of the dry-type transformer loses a cooling air source due to full stop during operation is reduced, and the potential safety hazard of overhigh temperature during operation of the dry-type transformer is effectively eliminated.

(3) According to the dry-type transformer cooling fan control system, the plurality of cooling fans are controlled separately, when the fans break down, the fans with faults can be found out quickly for maintenance, the whole equipment is not stopped, the maintenance time is shortened, and property loss is reduced. Meanwhile, the utility model has simple structure, low purchase cost of used electrical elements, low maintenance cost, low circuit design difficulty, low modification difficulty, easy popularization and wide application.

Drawings

FIG. 1 is an overall schematic diagram of a control circuit of the present invention;

FIG. 2 is a schematic diagram of a cooling fan control circuit of the present invention;

FIG. 3 is a schematic diagram of the temperature measurement wiring of the dry temperature-changing controller of the present invention.

The reference numerals in the schematic drawings illustrate:

1. an incoming line power supply; 2. controlling a power supply; 3. a main control unit; 31. a primary circuit; 311. a master switch; 312. an AC contactor contact; 32. a secondary circuit; 321. a bipolar switch; 322. a dry-type temperature-changing controller; 323. an AC contactor coil; 4. a sub-control circuit; 5. a sub-control unit; 51. a sub-control switch; 6. a cooling fan unit; 61. a cooling fan; 7. a temperature sensor; 8. a dry-type transformer.

Detailed Description

For a further understanding of the utility model, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Examples

With reference to fig. 1 to fig. 3, the dry-type transformer cooling fan control system of this embodiment includes a main control unit 3, a sub-control circuit 4, a sub-control unit 5, and a cooling fan unit 6, where the main control unit 3 is divided into a primary circuit 31 and a secondary circuit 32, the primary circuit 31 is connected to an incoming line power supply 1, the incoming line power supply 1 uses a three-phase four-wire ac power supply, and the voltage is 380V. The secondary circuit 32 is connected to the control power supply 2, and the control power supply 2 uses a single-phase ac power supply and has a voltage of 220V. Specifically, after the primary circuit 31 is connected to the incoming line power supply 1, the primary circuit is connected to a main control switch 311, and the main control switch 311 is a three-pole air switch QF1, and is used for switching on and off the power supply of the primary circuit 31 and simultaneously assumes a backup protection function of the circuit. The other end of the main control switch 311 is connected to the ac contactor contact 312, and then connected to the sub-control unit 5 through the sub-control circuit 4.

The secondary circuit 32 is connected to the control power source 2, then connected to the bipolar switch 321, and then connected to the inlet of the dry temperature controller 322. The outlet of the dry temperature controller 322 is connected to an ac contactor coil 323. The ac contactor coil 323 is in electromagnetic contact with the ac contactor contact 312 in the primary circuit to control the on/off of the ac contactor. In this embodiment, the dry temperature-changing controller 322 controls the ac contactor coil 323 arranged in the secondary circuit 32 to be powered on and powered off, and further controls the on and off of the ac contactor contact 312 in the primary circuit 31, so as to achieve the purpose of automatically controlling the on and off of the circuit, and automatically control the on and off of the whole circuit when necessary.

The dry temperature controller 322 is also electrically connected to the temperature sensor 7, the temperature sensor 7 is disposed on the dry transformer 8 to detect the three-phase temperature, and the dry temperature controller 322 displays the temperature of the dry transformer 8 and controls the on/off of the circuit according to the temperature. Specifically, after the temperature of each phase of the dry-type transformer 8 is detected by the temperature sensor 7, the dry-type temperature controller 322 analyzes and displays each specific temperature value, and sets the early warning temperature of the dry-type temperature controller 322, when one of the three phases of the dry-type transformer 8 exceeds the set early warning temperature, the output of the dry-type temperature controller 322 is turned on, the coil 323 of the ac contactor is powered on, and then the contact 312 of the ac contactor is turned on, so that the whole circuit is connected, and the cooling fan unit 6 is started to cool the dry-type transformer 8.

The main control unit 3 is connected with the sub-control unit 5 through the sub-control circuit 4, and the sub-control unit 5 comprises 6 sub-control switches 51 connected in parallel and connected to one main control unit 3 through the sub-control circuit 4. The sub-control switches 51 are three-pole air switches, are respectively QF11, QF12, QF13, QF14, QF15 and QF16, and are respectively connected with the number 1-6 cooling fans 61 in the cooling fan unit 6. When a certain cooling fan 61 breaks down, the sub-control switch 51 directly connected with the cooling fan will act preferentially to trip, isolate the cooling fan 61 with the fault, ensure the normal operation of other fans, and continuously provide cooling air sources for the dry-type transformer 8, thereby reducing the risk that the dry-type transformer 8 loses all air sources and is burnt out due to over-temperature.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the utility model, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the utility model.

Claims

1. A cooling fan control system of a dry type transformer comprises a cooling fan unit (6) consisting of a plurality of cooling fans (61), which is arranged beside a dry type transformer (8); the method is characterized in that: each cooling fan (61) is connected to the main control unit (3) through a corresponding sub-control switch (51); the main control unit (3) comprises a primary circuit (31) and a secondary circuit (32), the secondary circuit (32) comprises a dry-type temperature-changing controller (322) and an alternating current contactor coil (323) communicated with the dry-type temperature-changing controller, and the alternating current contactor coil (323) is in electromagnetic contact with an alternating current contactor contact (312) in the primary circuit (31) to control the on-off of the alternating current contactor coil.

2. A dry-type transformer cooling fan control system according to claim 1, characterized in that: the dry-type temperature-changing controller (322) is electrically connected with the temperature sensor (7), the temperature sensor (7) is arranged on the dry-type transformer (8) and is used for detecting the three-phase temperature of the dry-type transformer, and the dry-type temperature-changing controller (322) is used for controlling the on-off of the circuit according to the temperature.

3. A dry-type transformer cooling fan control system according to claim 1 or 2, wherein: the primary circuit (31) is also provided with a main control switch (311), and the main control switch (311) is arranged between the incoming line power supply (1) and the contact (312) of the alternating current contactor.

4. A dry-type transformer cooling fan control system according to claim 3, characterized in that: the plurality of sub-control switches (51) jointly form a sub-control unit (5), and the sub-control unit (5) is jointly connected to a primary circuit (31) through a sub-control circuit (4).

5. A dry-type transformer cooling fan control system according to claim 4, characterized in that: the main control switch (311) and the branch control switch (51) are all three-pole air switches.

6. A dry-type transformer cooling fan control system according to claim 5, characterized in that: in the secondary circuit (32), a bipolar switch (321) is arranged between the dry type temperature change controller (322) and the control power supply (2).

7. A dry-type transformer cooling fan control system according to claim 6, wherein: the incoming line power supply (1) uses a three-phase four-wire alternating current power supply, and the voltage is 380V; the control power supply (2) uses a single-phase alternating current power supply and has the voltage of 220V.

8. A dry-type transformer cooling fan control system according to claim 7, wherein: the cooling fans (61) are provided with 6 groups, and 6 sub-control switches (51) are arranged in total.