Transformer cooling fan control system

Abstract

The utility model relates to the technical field of transformer heat dissipation, in particular to a transformer heat dissipation fan control system, which is applied to an energy storage prefabricated cabin and comprises a transformer body, a temperature control box and an auxiliary source input end, heat dissipation fans are arranged on the transformer body and the energy storage prefabricated cabin, and the temperature control box is electrically connected with the auxiliary source input end. The temperature inside the transformer body is measured through the temperature sensor, and then the temperature control box controls starting and stopping of the transformer body draught fan and the transformer chamber draught fan through the temperature inside the transformer detected by the temperature sensor. When a fault occurs in the temperature control box or the temperature control box has a power loss fault, the fault dry contact on the temperature control box outputs a related signal to control the start of the standby power supply. Meanwhile, starting of the transformer body draught fan and the transformer room draught fan, fault information of the temperature control box, standby power starting signals of the transformer body draught fan and the transformer room draught fan and other signals in the whole process are uploaded to a control end to monitor the operation state of a loop of the transformer body draught fan and the transformer room draught fan.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer heat dissipation, and particularly relates to a control system for a transformer heat dissipation fan. Background Art

[0002] The main transformer is the main heat source in the energy storage prefabricated cabin. In the energy storage prefabricated cabin, the transformer is usually cooled by the transformer body fan and the transformer room fan. Therefore, the control method for the fan is particularly important.

[0003] In the existing solution, the temperature control box usually detects the temperature of the main transformer and controls the start and stop of the heat dissipation fan. However, in the existing solution, there is no design for detecting the failure of the transformer body fan and the backup power circuit when the temperature control box fails or loses power. When the temperature control box fails or loses power, the temperature control box will not be able to control the fan to start, resulting in a rapid increase in the temperature of the transformer, causing the transformer to overheat and shutting down the entire prefabricated cabin, which will seriously affect the user's use and reduce the service life of the transformer. Therefore, a new control solution is needed to control the fan. Summary of the Utility Model

[0004] The utility model provides a control system for a transformer heat dissipation fan to solve the defects and deficiencies in the prior art, aiming to solve the problems of unsatisfactory transformer cooling and inability of the fan on the transformer to start and stop automatically in the prior art.

[0005] To achieve the above object, the technical solution adopted by the utility model is a control system for a transformer heat dissipation fan, which is applied to an energy storage prefabricated cabin. The system includes a transformer body, a temperature control box and an auxiliary power input terminal. Heat dissipation fans are provided on both the transformer body and the energy storage prefabricated cabin. The temperature control box is electrically connected to the auxiliary power input terminal and the heat dissipation fan. The heat dissipation fan includes a transformer body fan and a transformer room fan. The system further includes a temperature sensor, a control terminal and a control circuit. The temperature control box is electrically connected to the control circuit. The control circuit includes a plurality of AC contactors and a plurality of intermediate relays. The temperature sensor is installed inside the transformer body and is used to measure the temperature inside the transformer body and upload the measured temperature signal to the temperature control box. The temperature control box controls the start or stop of the heat dissipation fan based on the received temperature signal and outputs the temperature signal of the transformer to the control terminal. The intermediate relay is used to expand the control signal transmitted by the temperature control box and upload the control signal to the control terminal. The intermediate relay and the AC contactor are both installed in the low-voltage cabinet of the prefabricated cabin. The AC contactors are respectively electrically connected to the temperature control box, the transformer body fan and the transformer room fan, and are used to control the on-off of the power supply of the transformer body fan and the transformer room fan.

[0006] Further, the multiple intermediate relays include intermediate relay KA1, intermediate relay KA2, intermediate relay KA3, intermediate relay KA4, and intermediate relay KA7, and the multiple AC contactors include the coil of AC contactor KM1 and the coil of AC contactor KM2. One end of intermediate relay KA1, intermediate relay KA2, intermediate relay KA3, and intermediate relay KA4 is electrically connected to the temperature control box, and the other end is electrically connected to the neutral line N1. One end of intermediate relay KA7 is electrically connected to the temperature control box, and the other end is electrically connected to the neutral line N3. The coils of AC contactor KM1 and AC contactor KM2 are both electrically connected to the neutral line N3. The coil of AC contactor KM1 is electrically connected to the first contact of intermediate relay KA3, intermediate relay KA7, and the coil of AC contactor KM1. The first contacts of intermediate relay KA3 and intermediate relay KA7 are electrically connected to the live wire L3. The coil of AC contactor KM2 is electrically connected to the first contact of the coil of AC contactor KM1, and the first contact of the coil of AC contactor KM1 is electrically connected to the temperature control box.

[0007] Further, the coil of AC contactor KM1 further includes a second contact, a third contact, a fourth contact, and a fifth contact. One end of the second contact is electrically connected to the temperature control box, and the other end is electrically connected to the fan of the transformer body. One end of the temperature control box and the fan of the transformer body are both electrically connected to the neutral line N2. One end of the third contact is electrically connected to the second contact, and the other end is connected to one end of the fifth contact. The other end of the fifth contact is electrically connected to the live wire L2. One end of the fourth contact is electrically connected to the temperature control box, and the other end is connected to the common end of the fifth contact and the fan of the transformer body.

[0008] Further, the first contact, the third contact, and the fifth contact are all normally open contacts.

[0009] Further, the second contact and the fourth contact are both normally closed contacts.

[0010] Advantages of the utility model:

[0011] The utility model provides a control system for a transformer cooling fan. The temperature inside the transformer body is measured by a temperature sensor, and the temperature control box controls the start and stop of the fan of the transformer body and the fan of the transformer room according to the temperature inside the transformer detected by the temperature sensor. When a fault occurs inside the temperature control box or a power failure fault occurs in the temperature control box, the fault dry contact on the temperature control box will output relevant signals to control the start of the standby power supply. At the same time, signals such as the start of the fan of the transformer body and the fan of the transformer room, the fault information of the temperature control box, and the start of the backup power supply of the fan of the transformer body and the fan of the transformer room during the whole process are uploaded to the control end to monitor the operating state of the circuits of the fan of the transformer body and the fan of the transformer room. Brief Description of the Drawings

[0012] Figure 1 It is a block diagram of a control system for a transformer cooling fan according to the present utility model;

[0013] Figure 2 It is a circuit schematic diagram of a control system for a transformer cooling fan according to the present utility model;

[0014] Figure 3 It is a circuit schematic diagram when the transformer chamber fan is a single-phase fan in a control system for a transformer cooling fan according to the present utility model;

[0015] Figure 4 It is a circuit schematic diagram when the transformer chamber fan is a three-phase fan in a control system for a transformer cooling fan according to the present utility model;

[0016] Figure 5 It is an interface definition diagram of a temperature control box used in the prior art;

[0017] Figure 6 It is an interface definition diagram of a temperature control box of a control system for a transformer cooling fan according to the present utility model. Detailed Description of the Preferred Embodiment

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0020] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0021] The present utility model provides a control system for a transformer cooling fan.

[0022] In an embodiment of the present utility model, as Figure 1 shown, the control system for a transformer cooling fan is applied to an energy storage prefabricated cabin. The system includes a transformer body, a temperature control box, and an auxiliary power input terminal. Cooling fans are provided on both the transformer body and the energy storage prefabricated cabin. The temperature control box is electrically connected to the auxiliary power input terminal and the cooling fans. The cooling fans include a transformer body fan and a transformer room fan. The system further includes a temperature sensor, a control terminal, and a control circuit. The temperature control box is electrically connected to the control circuit. The control circuit includes a plurality of AC contactors and a plurality of intermediate relays. The temperature sensor is installed inside the transformer body and is used to measure the temperature inside the transformer body and upload the measured temperature signal to the temperature control box. The temperature control box controls the start or stop of the cooling fan based on the received temperature signal and outputs the temperature signal of the transformer to the control terminal. The intermediate relay is used to expand the control signal transmitted by the temperature control box and upload the control signal to the control terminal. The intermediate relay and the AC contactor are both installed in the low-voltage cabinet of the prefabricated cabin. The AC contactors are respectively electrically connected to the temperature control box, the transformer body fan, and the transformer room fan, and are used to control the on and off of the power supply of the transformer body fan and the transformer room fan.

[0023] In this embodiment, the plurality of intermediate relays include intermediate relay KA1, intermediate relay KA2, intermediate relay KA3, intermediate relay KA4, and intermediate relay KA7. The plurality of AC contactors include the coil of AC contactor KM1 and the coil of AC contactor KM2. One end of intermediate relay KA1, intermediate relay KA2, intermediate relay KA3, and intermediate relay KA4 is electrically connected to the temperature control box, and the other end is electrically connected to the neutral line N1. One end of intermediate relay KA7 is electrically connected to the temperature control box, and the other end is electrically connected to the neutral line N3. The coils of AC contactor KM1 and AC contactor KM2 are both electrically connected to the neutral line N3. The coil of AC contactor KM1 is electrically connected to intermediate relay KA3, intermediate relay KA7, and the first contact of the coil of AC contactor KM1. The first contacts of intermediate relay KA3 and intermediate relay KA7 are electrically connected to the live wire L3. The coil of AC contactor KM2 is electrically connected to the first contact of the coil of AC contactor KM1, and the first contact of the coil of AC contactor KM1 is electrically connected to the temperature control box.

[0024] In this embodiment, the coil of the AC contactor KM1 further includes a second contact, a third contact, a fourth contact, and a fifth contact. One end of the second contact is electrically connected to the temperature control box, and the other end is electrically connected to the transformer body fan. Both the temperature control box and one end of the transformer body fan are electrically connected to the neutral line N2. One end of the third contact is electrically connected to the second contact, and the other end is connected to one end of the fifth contact. The other end of the fifth contact is electrically connected to the live wire L2. One end of the fourth contact is electrically connected to the temperature control box, and the other end is connected to the common end of the fifth contact and the transformer body fan.

[0025] In this embodiment, the first contact, the third contact, and the fifth contact are all normally open contacts.

[0026] In this embodiment, the second contact and the fourth contact are both normally closed contacts.

[0027] In this application, the temperature inside the transformer body is measured by a temperature sensor, and the temperature control box then controls the start and stop of the transformer body fan and the transformer room fan based on the temperature inside the transformer detected by the temperature sensor. When a fault occurs inside the temperature control box or a power failure fault occurs in the temperature control box, the fault dry contact on the temperature control box will output relevant signals to control the start of the standby power supply. At the same time, signals such as the start of the transformer body fan, the transformer room fan, the fault information of the temperature control box, and the start of the backup power supply of the transformer body fan and the transformer room fan during the whole process are uploaded to the control end to monitor the operating status of the transformer body fan and the transformer room fan circuits. During normal operation, the temperature control box supplies power to the transformer body fan and controls the start of the transformer room fan. When a fault occurs, the fault signal controls the control circuit to start supplying power to the transformer body fan and controls the start of the transformer room fan.

[0028] As Figure 2 shown, when the transformer room fan is a single-phase fan, the transformer room fan is evenly divided into two groups and the transformer body fan is divided into three groups in total, and the three groups of fans are respectively connected to the three-phase alternating current, that is, the three phases of the auxiliary source transformer, so as to reduce the unbalance of the output of the auxiliary source transformer. The transformer body uses a single-phase fan, which is divided into two groups with equal numbers and respectively connected to the two power supplies of the temperature control box. When a fault occurs in the transformer body fan group, the output currents of the two power supplies of the temperature control box will be unbalanced. At this time, the temperature control box will output a fan fault signal, and the fault signal will be expanded and uploaded to the control end through the intermediate relay KA4.

[0029] The temperature sensor uploads the internal temperature of the transformer body to the temperature control box. When the transformer temperature reaches the set starting temperature of the transformer body fan, the single-phase fan of the transformer body is powered by the two-way power output contacts (3, 4 and 5, 6) of the temperature control box; at the same time, the remote transmission signal contacts (17, 18) of the fan are turned on, causing the coil of AC contactor KM2 to be energized, and then turning on the power supply of the transformer room fan. When the temperature of the transformer in the energy storage prefabricated cabin is lower than the stopping temperature of the transformer body fan, the two-way power supply of the temperature control box will stop powering the transformer body fan; at the same time, the remote transmission signal contacts (17, 18) of the fan are disconnected, and the coil of AC contactor KM2 loses power, and then cuts off the power supply of the transformer room fan.

[0030] When the transformer temperature reaches the set over-temperature alarm temperature, the temperature control box will output a high-temperature alarm signal, and expand and upload the over-temperature alarm signal to the control terminal through the intermediate relay KA2.

[0031] When the transformer reaches the set over-temperature trip temperature, the temperature control box will output an over-temperature trip signal, and upload the over-temperature trip signal to the control terminal through the intermediate relay KA1, and at the same time trip the main switch on the high-voltage side of the energy storage prefabricated cabin to shut down the entire prefabricated cabin.

[0032] When there is a fault in the internal circuit of the temperature control box or the probe of the temperature sensor, at this time, the fan power supply circuit and the fan remote transmission signal of the temperature control box will fail. At the same time, the fault contacts (11, 12) of the temperature control box will close to energize the intermediate relay KA3, upload the temperature control box fault to the control terminal and energize the coil of AC contactor KM1. After the coil of contactor KM1 is energized, the contacts close to start the fan backup power supply.

[0033] When the temperature control box loses power, the power-off dry contact of the temperature control box closes, and the intermediate relay KA7 is energized to upload the power-off signal of the temperature control box and energize the coil of AC contactor KM1. After the coil of AC contactor KM1 is energized, the contacts close to start the fan backup power supply. Among them, the power supply of the intermediate relay KA7 is taken from the power supply of the peripheral measurement and control device to ensure that the power-off signal of the temperature control box can be received when the measurement and control device is powered on.

[0034] After the coil of AC contactor KM1 is energized, it will cut off the power output of the temperature control box, turn on the backup power supply of the transformer body fan and the backup power supply of the coil of AC contactor KM2, and upload the signal of the start of the backup power supply to the measurement and control device through the auxiliary contact of the coil of AC contactor KM1.

[0035] Such as Figures 3 - 4As shown in the figure, it should be noted that if the remote signal of the transformer body fan is not used, the coil of AC contactor KM2 is directly connected in series in the power supply circuit. The transformer body fan and the transformer room fan are connected to the power supply A, B, C and N in a phase-by-phase manner, and the coil of AC contactor KM2 is used in common to control their startup. When the temperature control box fails or loses power, the backup power supply of the coil of AC contactor KM2 is started.

[0036] Install a temperature switch in the transformer room to replace the remote signal of the fan on the temperature control box to control the transformer room fan.

[0037] Figure 5 For the existing temperature control box, the two-way fan power supply circuits share a fuse for protection. When this fuse blows, the power supplies of the two-way fans are both cut off, but at this time the temperature control box will not emit any alarm signal.

[0038] Figure 6 For the temperature control box used in this application, the air switch on the power supply circuit of the previous temperature control box body is cancelled, and a fuse is installed at the original air switch position. In this way, a fuse can be installed in each of the two fan power supply branches, and the size of the temperature control box does not need to be increased. If there is a short circuit in the fan, only the fuse of one fan power supply branch will blow. At this time, the output of the two-way fan power supply of the temperature control box is unbalanced, and the temperature control box will issue a fan failure alarm.

[0039] This solution uses the remote signal of the fan on the temperature control box to control the coil of AC contactor KM2 to supply power to the transformer room fan. When the temperature of the transformer body reaches the fan startup temperature, the remote contact of the fan closes, thereby controlling the startup of the transformer room fan. The remote signal of the fan is not affected by the fan failure signal. When the transformer body fan fails, the remote signal of the fan can still start the transformer room fan when the temperature of the transformer body reaches the startup temperature of the transformer room fan, and is not affected by the transformer body fan.

[0040] The power supply of the transformer room fan in this application uses a 4P air switch to take three-phase power from the auxiliary source transformer in the prefabricated cabin, which can meet the requirements of using three-phase fans or single-phase fans in the transformer room.

[0041] When any of the situations of temperature control box failure or temperature control box power loss occurs, corresponding alarm signals can be output and the backup power supplies of the transformer room fan and the transformer body fan can be started; when the backup power supply is started, a fan backup power supply startup signal is output.

[0042] Specifically, this application uses a high-precision temperature sensor to closely monitor the internal temperature of the transformer body, and intelligently controls the start and stop of the fan through a preset temperature threshold, achieving heat dissipation on demand and reducing unnecessary energy consumption. By designing the function of outputting the temperature control box failure and power loss signal of the temperature control box, once a fault in the temperature control box itself or an abnormal power supply is detected, the standby power supply can be immediately triggered to start, ensuring the continuous operation of the transformer body fan and the transformer room fan, and avoiding heat dissipation interruption caused by a single-point failure of the control system. Integrating and uploading the status of each link in the control of the transformer body fan and the transformer room fan (such as start, fault, standby power supply activation) to the control end realizes remote real-time monitoring of the operation status of the fan circuit, facilitating the timely response and handling by the operation and maintenance personnel, and improving the maintenance efficiency and operation stability of the system.

[0043] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A control system for a transformer cooling fan, which is applied to an energy storage prefabricated cabin. The system includes a transformer body, a temperature control box and an auxiliary power input terminal. Cooling fans are provided on both the transformer body and the energy storage prefabricated cabin. The temperature control box is electrically connected to the auxiliary power input terminal, and the temperature control box is electrically connected to the cooling fan. The cooling fan includes a transformer body fan and a transformer room fan; characterized in that, It also includes a temperature sensor, a control terminal and a control circuit. The temperature control box is electrically connected to the control circuit. The control circuit includes a plurality of AC contactors and a plurality of intermediate relays. The temperature sensor is installed inside the transformer body. The temperature sensor is used to measure the temperature inside the transformer body and upload the measured temperature signal to the temperature control box. The temperature control box controls the start or stop of the cooling fan based on the received temperature signal and outputs the temperature signal of the transformer to the control terminal. The intermediate relay is used to expand the control signal transmitted by the temperature control box and upload the control signal to the control terminal. The intermediate relay and the AC contactor are both installed in the low-voltage cabinet of the prefabricated cabin. The AC contactor is respectively electrically connected to the temperature control box, the transformer body fan and the transformer room fan. The AC contactor is used to control the on / off of the power supply of the transformer body fan and the transformer room fan.

2. The control system of a transformer cooling fan according to claim 1, characterized in that, The plurality of intermediate relays include intermediate relay KA1, intermediate relay KA2, intermediate relay KA3, intermediate relay KA4, and intermediate relay KA7. The plurality of AC contactors include the coil of AC contactor KM1 and the coil of AC contactor KM2. One end of intermediate relay KA1, intermediate relay KA2, intermediate relay KA3, and intermediate relay KA4 is electrically connected to the temperature control box, and the other end is electrically connected to the neutral line N1. One end of intermediate relay KA7 is electrically connected to the temperature control box, and the other end is electrically connected to the neutral line N3. The coil of AC contactor KM1 and the coil of AC contactor KM2 are both electrically connected to the neutral line N3. The coil of AC contactor KM1 is electrically connected to the first contact of intermediate relay KA3, intermediate relay KA7, and the coil of AC contactor KM1. The first contacts of intermediate relay KA3 and intermediate relay KA7 are electrically connected to the live wire L3. The coil of AC contactor KM2 is electrically connected to the first contact of the coil of AC contactor KM1, and the first contact of the coil of AC contactor KM1 is electrically connected to the temperature control box.

3. The control system of a transformer cooling fan according to claim 2, characterized in that, The coil of AC contactor KM1 also includes a second contact, a third contact, a fourth contact, and a fifth contact. One end of the second contact is electrically connected to the temperature control box, and the other end is electrically connected to the transformer body fan. One end of the temperature control box and the transformer body fan is electrically connected to the neutral line N2. One end of the third contact is electrically connected to the second contact, and the other end is connected to one end of the fifth contact. The other end of the fifth contact is electrically connected to the live wire L2. One end of the fourth contact is electrically connected to the temperature control box, and the other end is connected to the common end of the fifth contact and the transformer body fan.

4. The control system of a transformer cooling fan according to claim 3, characterized in that The first contact, the third contact, and the fifth contact are all normally open contacts.

5. The control system of a transformer cooling fan according to claim 3, wherein, The second contact and the fourth contact are both normally closed contacts.

Images