Transformer and transformer chamber heat dissipation system thereof

Abstract

The invention belongs to the technical field of transformer temperature control, and particularly relates to a transformer and a transformer chamber cooling system thereof. In order to solve the problem that the service life of a transformer is shortened due to temperature rise of the transformer chamber caused by the fact that damage of fans in the transformer chamber is not easy to find, a temperature controller collects currents of the fans on the two sides of a transformer body respectively, calculates the difference value of the currents on the two sides, and judges whether the fans on the two sides of the transformer body break down or not according to the calculated difference value. Intelligent fan fault monitoring is achieved, the situation that the transformer is burnt down due to uneven heat dissipation of the two sides of the transformer body is prevented, and safe and stable operation of the transformer is ensured; two paths of power supplies are used for supplying power, so that the conditions of single-phase overload and three-phase imbalance of the auxiliary transformer are prevented, and the cost is saved; ring temperature control is used for independently controlling starting of the transformer chamber shell fan, heat of the transformer chamber is discharged, the starting frequency of the transformer body fan is reduced, the service life of the fan is prolonged, and safe operation of the transformer is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer temperature control, and in particular relates to a transformer and a heat dissipation system for a transformer chamber thereof. Background Art

[0002] With the rapid development of new energy photovoltaic technology, the capacity of photovoltaic matrix is ​​constantly increasing. In order to adapt to the changing market demand, large-capacity prefabricated substations have come into being. Large-capacity transformers will generate more heat. How to effectively ventilate and dissipate heat in the transformer room has become a problem that needs to be paid attention to and solved. If the ventilation and heat dissipation of the transformer is unreasonable, the transformer is prone to operate in a high-temperature environment, which will not only affect the life of the transformer, but may even cause the transformer to burn out, which will cause great safety hazards.

[0003] At present, the schematic diagram of heat dissipation in the transformer room of the prefabricated substation is as follows Figure 1 As shown, a transformer temperature control is installed on the mesh door of the transformer room, and the temperature sensor of the transformer temperature control is buried in the interlayer of the transformer coil to detect the temperature of the transformer coil. When the coil temperature is too high, the transformer temperature control controls the fans in the transformer room to start, and the fans on the left side of the transformer body and the fans on the right side of the transformer body inhale cold air through the heat dissipation holes on the bottom plate of the transformer room. The cold air is discharged upward along the inner side of the transformer cylinder wall, taking away the heat generated by the transformer coil. The hot air discharged from the upper row is discharged outward through the fan of the transformer room shell, thereby achieving the purpose of cooling the transformer; the specific implementation method is as follows Figure 2 As shown, the transformer temperature control sensor detects the transformer coil temperature. When the temperature is higher than the transformer temperature control fan start threshold, the transformer temperature control internal relay is activated, the normally open point K1 is closed, and the fourth and fifth pins of the transformer temperature control output 220V voltage to start the transformer body left fan, transformer body right fan and transformer room casing fan.

[0004] If only the above method is used for ventilation and heat dissipation, the temperature of the transformer room can be reduced, but there will be the following problems: Since the fans on both sides of the transformer body are installed inside the transformer room, the transformer room mesh door cannot be opened when the substation is operating normally. When one of the fans on both sides of the transformer body is damaged, it is difficult for the operation and maintenance personnel to find it. At this time, the heat dissipation of the transformer coil is not smooth enough, causing the transformer to operate at a higher temperature, which not only affects the life of the transformer, but also has the risk of burning; for large-capacity prefabricated substations, the transformer will generate more heat, and more fans are needed to dissipate heat. As a result, the power supply capacity of the fan also needs to be increased. At this time, single-phase power supply will cause three-phase imbalance on the power supply side, and the capacity of the auxiliary transformer needs to be increased for the prefabricated substation, which increases the cost; when the ambient temperature of the transformer room is high, but the transformer is not running at full load, the temperature of the transformer coil is relatively low, and the transformer temperature control cannot start the fan. At this time, the high temperature environment of the transformer room will also affect the life of the transformer. If the transformer temperature control sets a lower fan start threshold, the fan will start frequently, affecting the life of the fan. Summary of the invention

[0005] The object of the present invention is to provide a transformer and a heat dissipation system for a transformer chamber thereof, so as to solve the problem that damage of a fan in a transformer chamber is difficult to be found, which causes the temperature of the transformer chamber to rise and reduces the service life of the transformer.

[0006] In order to solve the above technical problems, the present invention provides a transformer room heat dissipation system, which includes a thermostat, a transformer temperature sensor, and a transformer body left fan and a transformer body right fan respectively located on both sides of the transformer body, the transformer temperature sensor is used to detect the temperature of the transformer and input it into the thermostat, the thermostat is used to control the transformer body left fan and the transformer body right fan to work when the temperature input by the transformer temperature sensor is higher than a set threshold value, and is characterized in that it also includes a current collection device for collecting currents of the transformer body left fan and the transformer body right fan, and inputting the collected current into the thermostat, the thermostat is also used to make a difference between the two collected current values, and judge whether the transformer body left fan and the transformer body right fan are faulty according to the obtained difference.

[0007] The beneficial effect is as follows: in order to solve the problem that the damage of the indoor fan of the transformer is difficult to find, which causes the temperature of the transformer room to rise and leads to a shortened service life of the transformer, the temperature controller in the present invention respectively collects the current of the fan on the left side and the fan on the right side of the transformer body, calculates the difference between the two current values, and determines whether the fans on the left and right sides of the transformer body are faulty according to the calculated difference, thereby realizing the intelligent monitoring of fan faults, preventing the transformer from burning due to uneven heat dissipation on the left and right sides of the transformer body, and ensuring the safe and stable operation of the transformer.

[0008] Furthermore, the specific means for judging whether the fan on the left side of the transformer body and the fan on the right side of the transformer body are faulty is as follows: if the current difference between the fans on both sides is less than or equal to the set threshold, it is judged that the fan is not faulty, that is, the fans on both sides of the transformer body are operating normally; if the current difference between the fans on both sides is greater than the set threshold, it is judged that the fan is faulty, and the transformer temperature control outputs a fault signal.

[0009] The beneficial effect is that through simple calculation, it can be determined whether the fans on both sides of the transformer body located in the transformer room are faulty, thus realizing intelligent fan fault monitoring and facilitating monitoring by maintenance personnel.

[0010] Furthermore, the system also includes a transformer chamber casing fan installed on the transformer chamber casing, and the transformer chamber casing fan is individually connected to a phase of the auxiliary transformer to draw power, and the fan on the left side of the transformer body and the fan on the right side of the transformer body are connected to another phase of the auxiliary transformer to draw power.

[0011] The beneficial effects are: using two power supplies, under the same fan load, an auxiliary transformer with lower capacity can be selected, saving costs, preventing single-phase overload and three-phase imbalance of the auxiliary transformer, and ensuring the reliability of the fan circuit power supply.

[0012] Furthermore, the switch provided on the power supply circuit of the transformer room casing fan for controlling the power on and off of the circuit is a contact of a relay, and the coil of the relay is connected in parallel with the fan on the left side of the transformer body or the fan on the right side of the transformer body.

[0013] Its beneficial effects are: by starting and stopping the fans on both sides of the transformer body, it is reflected whether the temperature of the transformer body exceeds the set threshold, so as to indirectly control the fans of the transformer room casing, so that the heat dissipation fans cooperate with each other, improve the heat dissipation efficiency, and ensure the safe and stable operation of the transformer.

[0014] Furthermore, the system also includes an ambient temperature sensor and a transformer chamber casing fan installed on the transformer chamber casing. The ambient temperature sensor is used to collect the ambient temperature in the transformer chamber and input it into the temperature controller. The temperature controller is used to control the transformer chamber casing fan to operate when the temperature uploaded by the ambient temperature sensor is higher than a set threshold.

[0015] The beneficial effects are: using a thermostat to independently control the start-up of the transformer room casing fan, discharge the heat of the transformer room, reduce the frequency of starting the transformer body fan, increase the service life of the fan, and ensure the safe operation of the transformer.

[0016] In order to solve the above technical problems, the present invention also provides a transformer, which includes a transformer body and a heat dissipation system. The heat dissipation system includes a temperature controller, a transformer temperature sensor, and a left fan of the transformer body and a right fan of the transformer body respectively located on both sides of the transformer body. The transformer temperature sensor is used to detect the temperature of the transformer and input it into the temperature controller. The temperature controller is used to control the operation of the left fan of the transformer body and the right fan of the transformer body when the temperature input by the transformer temperature sensor is higher than a set threshold. It is characterized in that the heat dissipation system is used to perform fault detection on the left fan of the transformer body and the right fan of the transformer body. The heat dissipation system also includes a current collection device for collecting currents of the left fan of the transformer body and the right fan of the transformer body, and inputting the collected current into the temperature controller. The temperature controller is also used to subtract the two collected current values, and judge whether the left fan of the transformer body and the right fan of the transformer body are faulty according to the obtained difference.

[0017] The beneficial effects are as follows: the temperature controller in the heat dissipation system of the transformer of the present invention respectively collects the current of the fan on the left side and the fan on the right side of the transformer body, calculates the difference between the two current values, and determines whether the fans on the left and right sides of the transformer body fail according to the calculated difference, thereby realizing intelligent fan fault monitoring, preventing the transformer from burning due to uneven heat dissipation on the left and right sides of the transformer body, and ensuring safe and stable operation of the transformer.

[0018] Furthermore, the specific means for judging whether the fan on the left side of the transformer body and the fan on the right side of the transformer body are faulty is as follows: if the current difference between the fans on both sides is less than or equal to the set threshold, it is judged that the fan is not faulty, that is, the fans on both sides of the transformer body are operating normally; if the current difference between the fans on both sides is greater than the set threshold, it is judged that the fan is faulty, and the transformer temperature control outputs a fault signal.

[0019] The beneficial effect is that through simple calculation, it can be determined whether the fans on both sides of the transformer body located in the transformer room are faulty, thus realizing intelligent fan fault monitoring and facilitating monitoring by maintenance personnel.

[0020] Furthermore, the system also includes a transformer chamber casing fan installed on the transformer chamber casing, and the transformer chamber casing fan is individually connected to a phase of the auxiliary transformer to draw power, and the fan on the left side of the transformer body and the fan on the right side of the transformer body are connected to another phase of the auxiliary transformer to draw power.

[0021] The beneficial effects are: using two power supplies, under the same fan load, an auxiliary transformer with lower capacity can be selected, saving costs, preventing single-phase overload and three-phase imbalance of the auxiliary transformer, and ensuring the reliability of the fan circuit power supply.

[0022] Furthermore, the switch provided on the power supply circuit of the transformer room casing fan for controlling the power on and off of the circuit is a contact of a relay, and the coil of the relay is connected in parallel with the fan on the left side of the transformer body or the fan on the right side of the transformer body.

[0023] Its beneficial effects are: by starting and stopping the fans on both sides of the transformer body, it is reflected whether the temperature of the transformer body exceeds the set threshold, so as to indirectly control the fans of the transformer room casing, so that the heat dissipation fans cooperate with each other, improve the heat dissipation efficiency, and ensure the safe and stable operation of the transformer.

[0024] Furthermore, the system also includes an ambient temperature sensor and a transformer chamber casing fan installed on the transformer chamber casing. The ambient temperature sensor is used to collect the ambient temperature in the transformer chamber and input it into the temperature controller. The temperature controller is used to control the transformer chamber casing fan to operate when the temperature uploaded by the ambient temperature sensor is higher than a set threshold.

[0025] The beneficial effects are: using a thermostat to independently control the start-up of the transformer room casing fan, discharge the heat of the transformer room, reduce the frequency of starting the transformer body fan, increase the service life of the fan, and ensure the safe operation of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of heat dissipation of a prefabricated substation transformer in the prior art;

[0027] Figure 2 It is a schematic diagram of fans on both sides of the transformer body in the prior art;

[0028] Figure 3 is a schematic diagram of fans on both sides of the transformer body of this embodiment;

[0029] Figure 4 It is a schematic diagram of the transformer room housing fan of this embodiment. DETAILED DESCRIPTION

[0030] The basic concept of the present invention is: in the present invention, the fans on the left and right sides of the transformer body are respectively connected to the two fan load output circuits of the transformer temperature control, and the currents on the two fan load output circuits are collected, and the difference between the two current values ​​is calculated. If the difference is zero, the fans on both sides of the transformer body are operating normally. If the difference is not zero, the fans on both sides of the transformer body fail, and a fault signal is sent to remind maintenance personnel to perform maintenance. The specific principle is to install fans of the same power on both sides of the transformer body so that the current values ​​when the fans are operating normally are the same, and whether the fans fail is determined based on the difference between the two currents, thereby realizing the intelligent monitoring of fan faults, preventing the transformer from burning due to uneven heat dissipation on the left and right sides of the transformer body, and ensuring the safe and stable operation of the transformer. Based on this concept, a transformer and its transformer room heat dissipation system of the present invention can be realized.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and method embodiments.

[0032] Transformer room heat dissipation system embodiment 1:

[0033] A transformer room heat dissipation system of the present invention, the system principle diagram is as follows Figure 3 As shown, it specifically includes a temperature controller, a transformer temperature control sensor CG2, a transformer body left fan FJ1, a transformer body right fan FJ2 and a current acquisition device, wherein the temperature controller in this embodiment is a transformer temperature control WK2, the transformer temperature control sensor CG2 is used to collect the temperature of the transformer, and input the collected temperature into the transformer temperature control WK2; the transformer temperature control WK2 is used to control the start and stop of the transformer body left fan FJ1 and the transformer body right fan FJ2 according to whether the transformer temperature input by the transformer temperature control sensor CG2 is greater than a set threshold, and the transformer temperature control WK2 controls the first load relay of the transformer temperature controller. The on and off of the power supply circuit where the fan FJ1 on the left side of the transformer body is located is controlled by closing and opening the electrical appliance K2, and the on and off of the power supply circuit where the fan FJ2 on the right side of the transformer body is located is controlled by controlling the closing and opening of the second load relay K3 of the transformer temperature controller, and the power supply circuit where the fan FJ1 on the left side of the transformer body and the power supply circuit where the fan FJ2 on the right side of the transformer body are located are connected to the same power supply branch; the power supply branch is connected between La and N, and the on and off of the power supply branch is controlled by the transformer temperature control power supply circuit breaker ZK2; the signal output end of the transformer temperature control WK2 is connected to the host computer ln, which is used to output the host computer signal to the host computer ln;

[0034] The current acquisition device is used to collect the current value of the power supply circuit where the fan FJ1 on the left side of the transformer body and the fan FJ2 on the right side of the transformer body are located, and the collected current value is input into the transformer temperature control WK2. The transformer temperature control WK2 is also used to judge whether the fans on both sides of the transformer body are faulty according to the current value collected by the current acquisition device. When the fans on both sides are operating normally, the difference between the two load currents is zero. When the fan on one side is damaged, the difference between the two load currents is not zero, and the difference reaches the temperature control alarm threshold. At this time, the transformer temperature control WK2 judges that the fan is faulty. The transformer temperature control WK2 sends a transformer body fan fault signal and uploads the signal to the background host computer ln through the fifteenth and sixteenth pins of the transformer temperature control WK2; the power of the fans on both sides of the transformer body is the same.

[0035] This embodiment realizes intelligent fan fault monitoring, prevents the transformer from burning due to uneven heat dissipation on the left and right sides of the transformer body, and ensures safe and stable operation of the transformer.

[0036] Transformer room heat dissipation system embodiment 2:

[0037] The transformer room heat dissipation system embodiment 2 is further optimized on the basis of the above transformer room heat dissipation system embodiment 1. The system principle diagram of this embodiment is as follows: Figure 4 As shown, it specifically includes an intermediate relay KA and a transformer room housing fan FJ3. The normally open contact of the intermediate relay KA is arranged in series on the power supply circuit where the transformer room housing fan FJ3 is located to control the start and stop of the transformer room housing fan FJ3. The coil of the intermediate relay KA is connected in parallel with the fan FJ1 on the left side of the transformer body, as shown in FIG. Figure 3 As shown, it is used to keep the start and stop states of the transformer room housing fan FJ3 consistent with the fan FJ1 on the left side of the transformer body; the transformer room housing fan FJ3 is installed on the upper side of the transformer body, and the power supply circuit where the transformer room housing fan FJ3 is located is connected between Lb and N, and the power supply branch is controlled by the ambient temperature control power supply circuit breaker ZK2;

[0038] The power supply circuit of the transformer housing fan FJ3 and the power supply circuit of the fans on both sides of the transformer body are respectively taken from any two phases of the auxiliary transformer, that is, La is used to supply power to the fans FJ1 on the left side of the transformer body and FJ2 on the right side of the transformer body, and Lb is used to supply power to the fans FJ3 on the transformer housing; Figure 3 As shown, when the transformer temperature control sensor CG2 detects that the transformer coil temperature is higher than the transformer temperature control fan start threshold, the transformer temperature control WK2 outputs a 220V voltage through the fifth and sixth pins, and the fan FJ2 on the right side of the transformer body starts. The transformer temperature control WK2 outputs a 220V voltage through the third and fourth pins, and the fan FJ1 on the left side of the transformer body starts, and the A1 and A2 pins of the intermediate relay KA are energized, and the normally open contacts 21 and 24 of the intermediate relay KA are closed. Figure 4 As shown in FIG. 1 , the transformer room casing fan FJ3 is started.

[0039] This embodiment adopts two power supplies. Under the same fan load, an auxiliary transformer with lower capacity can be selected to save costs, prevent single-phase overload and three-phase imbalance of the auxiliary transformer, and ensure the reliability of the fan circuit power supply.

[0040] Transformer room heat dissipation system embodiment 3:

[0041] The transformer room heat dissipation system embodiment 2 is further optimized on the basis of the above transformer room heat dissipation system embodiment 1, and the system principle diagram of this embodiment is as follows: Figure 4As shown, it specifically includes a thermostat and an ambient temperature control sensor CG3 (ambient temperature sensor), wherein the thermostat in this embodiment is an ambient temperature control WK3, the ambient temperature control sensor CG3 is used to collect the indoor ambient temperature of the transformer and input it into the ambient temperature control WK3, the ambient temperature control WK3 is connected in parallel with the normally open contact of the intermediate relay KA, and is used to control the start and stop of the transformer room casing fan FJ3 according to whether the indoor temperature of the transformer input by the ambient temperature control sensor CG3 is greater than the set threshold. The specific control method is: when the ambient temperature of the transformer room is high, but the transformer coil temperature is relatively low, the threshold of the ambient temperature control WK3 can be set at this time, when the ambient temperature control sensor CG3 detects that the ambient temperature of the transformer room is higher than the starting threshold of the ambient temperature control fan, the third pin and the fourth pin of the ambient temperature control WK3 are connected, and the transformer room casing fan FJ3 is started.

[0042] This embodiment uses ambient temperature control to independently control the start-up of the transformer chamber casing fan, discharges the heat from the transformer chamber, reduces the frequency of starting the transformer body fan, increases the service life of the fan, and ensures the safe operation of the transformer.

[0043] The transformer temperature control of the present invention adopts two-way fan load output, realizes the intelligent monitoring of fan faults, prevents the transformer from burning due to uneven heat dissipation on the left and right sides of the transformer body, and ensures the safe and stable operation of the transformer; adopts two-way power supply, and under the same fan load, an auxiliary transformer with lower capacity can be selected, saving costs, preventing single-phase overload and three-phase imbalance of the auxiliary transformer, and ensuring the reliability of the fan circuit power supply; uses ambient temperature control to separately control the start-up of the transformer room casing fan, discharges the heat of the transformer room, reduces the frequency of starting the transformer body fan, increases the service life of the fan, and ensures the safe operation of the transformer.

[0044] Transformer Example:

[0045] A transformer of the present invention includes a main body and a heat dissipation system matched therewith, which is used to dissipate heat from the transformer. The system has the ability to automatically detect faults of fans on both sides of the transformer main body in the transformer room, and can prevent the transformer room from being dissipated when the transformer is running at a low load and the ambient temperature is high. The system does not require a large-capacity auxiliary transformer to drive the fan for heat dissipation. The specific structure and working principle of the system have been described in detail in the above-mentioned transformer room heat dissipation system embodiments 1-3, so they will not be repeated here.

Claims

1. A heat dissipation system for a transformer room, the system comprising a thermostat, a transformer temperature sensor, and a transformer body left fan and a transformer body right fan respectively located on both sides of the transformer body, the transformer temperature sensor is used to detect the temperature of the transformer and input it into the thermostat, the thermostat is used to control the transformer body left fan and the transformer body right fan to work when the temperature input by the transformer temperature sensor is higher than a set threshold, characterized in that: It also includes a current collecting device for collecting the current of the fan on the left side of the transformer body and the fan on the right side of the transformer body, and inputting the collected current into the temperature controller. The temperature controller is also used to subtract the two collected current values, and judge whether the fan on the left side of the transformer body and the fan on the right side of the transformer body are faulty according to the difference obtained.

2. The transformer room heat dissipation system according to claim 1, characterized in that: The specific means of judging whether the fan on the left side of the transformer body and the fan on the right side of the transformer body are faulty is as follows: if the current difference between the fans on both sides is less than or equal to the set threshold, it is judged that the fan is not faulty, that is, the fans on both sides of the transformer body are operating normally; if the current difference between the fans on both sides is greater than the set threshold, it is judged that the fan is faulty, and the transformer temperature control outputs a fault signal.

3. The transformer room heat dissipation system according to claim 1, characterized in that: The system also includes a transformer housing fan installed on the transformer housing, and the transformer housing fan is separately connected to a phase of the auxiliary transformer for power supply, and the fan on the left side of the transformer body and the fan on the right side of the transformer body are connected to another phase of the auxiliary transformer for power supply.

4. The transformer room heat dissipation system according to claim 3, characterized in that: The switch for controlling the on and off of the power supply circuit of the transformer room housing fan is a contact of a relay, and the coil of the relay is connected in parallel with the fan on the left side of the transformer body or the fan on the right side of the transformer body.

5. The transformer room heat dissipation system according to claim 1, characterized in that: The system also includes an ambient temperature sensor and a transformer room casing fan installed on the transformer room casing. The ambient temperature sensor is used to collect the ambient temperature in the transformer room and input it into the temperature controller. The temperature controller is used to control the transformer room casing fan to work when the temperature uploaded by the ambient temperature sensor is higher than the set threshold.

6. A transformer, the transformer comprising a transformer body and a heat dissipation system, the heat dissipation system comprising a thermostat, a transformer temperature sensor, and a transformer body left fan and a transformer body right fan respectively located on both sides of the transformer body, the transformer temperature sensor is used to detect the temperature of the transformer and input it into the thermostat, the thermostat is used to control the transformer body left fan and the transformer body right fan to work when the temperature input by the transformer temperature sensor is higher than a set threshold, characterized in that: The heat dissipation system is used to detect faults of the fan on the left side of the transformer body and the fan on the right side of the transformer body. The heat dissipation system also includes a current collection device for collecting currents of the fan on the left side of the transformer body and the fan on the right side of the transformer body, and inputting the collected current into a temperature controller. The temperature controller is also used to subtract the two collected current values, and determine whether the fan on the left side of the transformer body and the fan on the right side of the transformer body are faulty based on the obtained difference.

7. The transformer according to claim 6, characterized in that: The specific means of judging whether the fan on the left side of the transformer body and the fan on the right side of the transformer body are faulty is as follows: if the current difference between the fans on both sides is less than or equal to the set threshold, it is judged that the fan is not faulty, that is, the fans on both sides of the transformer body are operating normally; if the current difference between the fans on both sides is greater than the set threshold, it is judged that the fan is faulty, and the transformer temperature control outputs a fault signal.

8. The transformer according to claim 6, characterized in that: The system also includes a transformer housing fan installed on the transformer housing, and the transformer housing fan is separately connected to a phase of the auxiliary transformer for power supply, and the fan on the left side of the transformer body and the fan on the right side of the transformer body are connected to another phase of the auxiliary transformer for power supply.

9. The transformer according to claim 8, characterized in that: The switch for controlling the on and off of the power supply circuit of the transformer room housing fan is a contact of a relay, and the coil of the relay is connected in parallel with the fan on the left side of the transformer body or the fan on the right side of the transformer body.

10. The transformer according to claim 6, characterized in that: The system also includes an ambient temperature sensor and a transformer room casing fan installed on the transformer room casing. The ambient temperature sensor is used to collect the ambient temperature in the transformer room and input it into the temperature controller. The temperature controller is used to control the transformer room casing fan to work when the temperature uploaded by the ambient temperature sensor is higher than the set threshold.

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