A dual channel temperature protection system

Abstract

The utility model discloses a kind of double-channel temperature protection systems, including temperature acquisition module, power supply bus, fan heat dissipation module, main control module and temperature control module, temperature acquisition module has the first temperature output port of output first temperature signal and the second temperature output port of output second temperature signal, power supply bus is connected with fan heat dissipation module, main control module is connected with the first temperature output port of temperature acquisition module, fan heat dissipation module and high voltage circuit breaker respectively, main control module controls the start-stop of fan heat dissipation module and controls the on-off of high voltage circuit breaker according to first temperature signal, temperature control module is connected with the second temperature output port of temperature acquisition module, fan heat dissipation module and high voltage circuit breaker respectively, temperature control module controls the start-stop of fan heat dissipation module and controls the on-off of high voltage circuit breaker according to second temperature signal, the design is reasonable and continuously cooling, improve the reliability and stability of temperature protection.

Description

Technical Field

[0001] This utility model relates to the field of temperature control and protection technology for electrical equipment, and in particular to a dual-channel temperature protection system. Background Technology

[0002] With the popularization of new energy sources, wind turbine nacelle transformers are widely used. Existing nacelle transformers all have temperature sensors installed in the transformer windings. The temperature sensors collect the temperature of the transformer windings and upload it to the control system. The control system then controls the wind turbine in the nacelle transformer to start according to the temperature. It also issues warnings and takes corresponding measures under continuous high temperature. However, because the environment in which the nacelle transformer is located is relatively harsh, and the control system has to take into account various control logics, if any link fails and the control system and personnel do not take effective handling measures, the nacelle transformer and related electrical equipment may be burned out. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a dual-channel temperature protection system, a multi-channel parallel temperature protection method, which provides reasonable and continuous cooling, improving the reliability and stability of temperature protection.

[0004] A dual-channel temperature protection system according to a first aspect of the present invention is applied to a nacelle-type transformer. The nacelle-type transformer includes a nacelle-type transformer and a high-voltage switchgear. A high-voltage circuit breaker is installed inside the high-voltage switchgear. The high-voltage winding of the nacelle-type transformer is connected to the first end of the high-voltage circuit breaker, and the tail end of the high-voltage circuit breaker is used for connection to electrical equipment. The dual-channel temperature protection system includes: a temperature acquisition module, used to be installed in the nacelle-type transformer to detect the temperature information of the low-voltage winding of the nacelle-type transformer and to generate a first temperature signal and a second temperature signal based on the temperature information. The temperature acquisition module has a first temperature output port for outputting the first temperature signal and a second temperature output port for outputting the second temperature signal. The system includes: a temperature output port; a power supply bus connected to the low-voltage winding for transmitting electrical energy; a fan cooling module for cooling the nacelle transformer, wherein the power supply bus is connected to the fan cooling module to transmit electrical energy to the fan cooling module; a main control module connected to the first temperature output port of the temperature acquisition module, the fan cooling module, and the high-voltage circuit breaker, wherein the main control module controls the start / stop of the fan cooling module and the on / off state of the high-voltage circuit breaker according to the first temperature signal; and a temperature control module connected to the second temperature output port of the temperature acquisition module, the fan cooling module, and the high-voltage circuit breaker, wherein the temperature control module controls the start / stop of the fan cooling module and the on / off state of the high-voltage circuit breaker according to the second temperature signal.

[0005] A dual-channel temperature protection system according to an embodiment of the present invention has at least the following beneficial effects:

[0006] This utility model presents a dual-channel temperature protection system with an additional temperature control module. The main control module and the temperature control module operate independently and in parallel. The temperature acquisition module detects the temperature information of the low-voltage winding of the nacelle transformer and generates a first temperature signal and a second temperature signal based on this information. The first temperature signal is output to the main control module, and the second temperature signal is output to the temperature control module. Either the main control module or the temperature control module can control the fan cooling module to start when the temperature of the low-voltage winding of the nacelle transformer rises, thus cooling the nacelle transformer. If the temperature continues to rise and reaches a dangerous level, either the main control module or the temperature control module can control the high-voltage circuit breaker to disconnect, stopping the output on the high-voltage side, thereby reducing the temperature of the low-voltage winding. Furthermore, since the fan cooling module is powered by the low-voltage winding, it can continue to operate after the high-voltage circuit breaker disconnects, ensuring that heat can be dissipated quickly. This design employs a multi-channel parallel temperature protection method, providing reasonable and continuous cooling, and improving the reliability and stability of temperature protection.

[0007] According to some embodiments of this utility model, the temperature control module is provided with an uplink transmission port, the main control module is provided with a downlink transmission port, and the uplink transmission port is connected to the downlink transmission port through a transmission cable.

[0008] According to some embodiments of the present invention, the fan cooling module includes a first switch module, a second switch module, and an axial flow fan and a centrifugal fan disposed on a nacelle transformer. The first switch module is connected to the axial flow fan to form at least a portion of a first power supply branch, and the second switch module is connected to the centrifugal fan to form at least a portion of a second power supply branch. Both the first power supply branch and the second power supply branch are connected to the power supply bus. The main control module is connected to the controlled terminal of the first switch module and the controlled terminal of the second switch module, respectively. The temperature control module is connected to the controlled terminal of the first switch module and the controlled terminal of the second switch module, respectively.

[0009] According to some embodiments of the present invention, the first switch module includes a first circuit breaker and a first disconnecting switch. The first circuit breaker and the first disconnecting switch are connected in series to form a first series branch. The first series branch is connected to an axial flow fan to form a first power supply branch. The main control module and the temperature control module are both connected to the controlled end of the first disconnecting switch and the controlled end of the first circuit breaker.

[0010] According to some embodiments of the present invention, the second switch module includes a second circuit breaker and a second disconnecting switch. The second circuit breaker and the second disconnecting switch are connected in series to form a second series branch. The second series branch is connected to a centrifugal fan to form a second power supply branch. The main control module and the temperature control module are both connected to the controlled terminal of the second disconnecting switch and the controlled terminal of the second circuit breaker.

[0011] According to some embodiments of this utility model, the dual-channel temperature protection system also includes an overvoltage protector. When the voltage applied to the overvoltage protector reaches the protection threshold, the overvoltage protector is turned on. The overvoltage protector is connected in parallel with the first power supply branch and the second power supply branch.

[0012] According to some embodiments of the present invention, the dual-channel temperature protection system further includes a main circuit breaker, wherein the first power supply branch and the second power supply branch are connected in parallel to form a parallel branch, and the parallel branch is connected to the power supply bus through the main circuit breaker.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0015] Figure 1 This is a schematic diagram of the principle structure circuit of one embodiment of the dual-channel temperature protection system of this utility model;

[0016] Figure 2 This is a flowchart of the protection control method of one embodiment of the dual-channel temperature protection system of this utility model.

[0017] Figure label:

[0018] 100 nacelle-type transformer; 110 high-voltage winding; 120 low-voltage winding; 200 power supply busbar; 300 high-voltage switchgear; 310 high-voltage circuit breaker; 400 temperature acquisition module; 500 fan cooling module; 510 first switch module; 511 first circuit breaker; 512 first disconnecting switch; 520 second switch module; 521 second circuit breaker; 522 second disconnecting switch; 530 axial flow fan; 540 centrifugal fan; 550 overvoltage protector; 560 main circuit breaker; 600 main control module; 610 downlink transmission port; 700 temperature control module; 710 uplink transmission port; 800 transmission cable. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] like Figure 1 , 2As shown, a dual-channel temperature protection system according to a first aspect embodiment of the present invention is applied to a nacelle-type transformer. The nacelle-type transformer includes a nacelle-type transformer 100 and a high-voltage switchgear 300. A high-voltage circuit breaker 310 is installed inside the high-voltage switchgear 300. The high-voltage winding 110 of the nacelle-type transformer 100 is connected to the first end of the high-voltage circuit breaker 310, and the tail end of the high-voltage circuit breaker 310 is used to connect to electrical equipment. The dual-channel temperature protection system includes a temperature acquisition module 400, a power supply bus 200, a fan cooling module 500, a main control module 600, and a temperature control module 700. The temperature acquisition module 400 is installed in the nacelle-type transformer 100 to detect the temperature information of the low-voltage winding 120 of the nacelle-type transformer 100 and generate a first temperature signal and a second temperature signal based on the temperature information. The temperature acquisition module 400 has a first temperature output port for outputting the first temperature signal. The power supply bus 200 is connected to the low-voltage winding 120 to transmit electrical energy, and the fan cooling module 500 is used to blow air to cool the nacelle transformer 100. The power supply bus 200 is connected to the fan cooling module 500 to transmit electrical energy to the fan cooling module 500. The main control module 600 is connected to the first temperature output port of the temperature acquisition module 400, the fan cooling module 500, and the high-voltage circuit breaker 310. The main control module 600 controls the start and stop of the fan cooling module 500 and the on and off of the high-voltage circuit breaker 310 according to the first temperature signal. The temperature control module 700 is connected to the second temperature output port of the temperature acquisition module 400, the fan cooling module 500, and the high-voltage circuit breaker 310. The temperature control module 700 controls the start and stop of the fan cooling module 500 and the on and off of the high-voltage circuit breaker 310 according to the second temperature signal.

[0024] The nacelle-type transformer 100 includes a nacelle cabinet and a transformer module located inside the nacelle cabinet. The transformer module includes a high-voltage winding 110 and a low-voltage winding 120 that are coupled to each other. The high-voltage switchgear 300 can be integrated with the nacelle cabinet or can be installed separately. The high-voltage winding 110 and the high-voltage circuit breaker 310 are electrically connected through connecting bushings and busbars installed on the nacelle cabinet and the high-voltage switchgear 300.

[0025] The temperature acquisition module 400 can be configured in various ways. For example, the temperature acquisition module 400 includes at least one temperature acquisition unit disposed in the low-voltage winding 120. The temperature acquisition unit can have two temperature output ports, namely a first temperature output port and a second temperature output port. The temperature acquisition unit can be a temperature sensor or a thermocouple. Specifically, there can be multiple temperature acquisition units. Each temperature acquisition unit is connected to the main control module 600 through the first temperature output port and to the temperature control module 700 through the second temperature output port.

[0026] The temperature acquisition module 400 may also include multiple temperature acquisition units disposed within the low-voltage winding 120 and located approximately close to each other. The temperature acquisition units may be temperature sensors or thermocouples. One temperature acquisition unit is provided with a first temperature output port for connection to the main control module 600, and another temperature acquisition unit is provided with a second temperature output port for connection to the temperature control module 700.

[0027] The main control module 600 typically consists of a CPU and its auxiliary circuits. As a device in the upper-level monitoring system, the main control module 600 controls the operation of electrical equipment such as the nacelle transformer 100 and the high-voltage switchgear 300 according to the instructions and logic set by the staff. The main control module 600 is also connected to external devices such as a display screen and control buttons. Therefore, the main control module 600 has more logic control programs and a relatively higher processing load.

[0028] The temperature control module 700 is typically composed of an MCU or PLC and its auxiliary circuits. The temperature control module 700 only processes the data related to the temperature protection system, such as the analysis of the second temperature signal, the control of the fan heat dissipation module 500, and the circuit breaking control of the high-voltage circuit breaker 310. Therefore, the processing load of the temperature control module 700 is relatively low.

[0029] This utility model's dual-channel temperature protection system includes an additional temperature control module 700. The main control module 600 and the temperature control module 700 operate independently and in parallel. The temperature acquisition module 400 detects the temperature information of the low-voltage winding 120 of the nacelle transformer 100 and generates a first temperature signal and a second temperature signal based on this information. The first temperature signal is output to the main control module 600, and the second temperature signal is output to the temperature control module 700. Either the main control module 600 or the temperature control module 700 can control the fan cooling module 500 to start when the temperature of the low-voltage winding 120 of the nacelle transformer 100 rises. The system uses airflow to cool the nacelle transformer 100. If the temperature continues to rise and reaches a dangerous level, either the main control module 600 or the temperature control module 700 can control the high-voltage circuit breaker 310 to trip, stopping the output on the high-voltage side and thus reducing the temperature of the low-voltage winding 120. Since the fan cooling module 500 is powered by the low-voltage winding 120, it can continue to operate even after the high-voltage circuit breaker 310 trips, ensuring that heat can be dissipated quickly. This design employs a multi-channel parallel temperature protection method, providing reasonable and continuous cooling, and improving the reliability and stability of temperature protection.

[0030] In some embodiments of this utility model, such as Figure 1As shown, the temperature control module 700 is provided with an uplink transmission port 710, and the main control module 600 is provided with a downlink transmission port 610. The uplink transmission port 710 is connected to the downlink transmission port 610 through a transmission cable 800.

[0031] If any communication failure occurs between the temperature control module 700 and the second temperature output port, or between the main control module 600 and the first temperature output port, the temperature control module 700 and the main control module 600 can still transmit and synchronize temperature data through the uplink transmission port 710, the transmission cable 800, and the downlink transmission port 610. The transmission cable 800 can be an optical fiber or a conventional data transmission line. The main control module 600 can be connected to the alarm module. When the temperature of the low-voltage winding 120 is too high, the main control module 600 can control the alarm module to tighten, and the temperature control module 700 will upload the temperature signal to the main control module 600, which will then trigger an alarm.

[0032] In some embodiments of this utility model, such as Figure 1 As shown, the fan cooling module 500 includes a first switch module 510, a second switch module 520, and an axial fan 530 and a centrifugal fan 540 disposed on the nacelle transformer 100. The first switch module 510 is connected to the axial fan 530 to form at least a portion of the first power supply branch, and the second switch module 520 is connected to the centrifugal fan 540 to form at least a portion of the second power supply branch. Both the first power supply branch and the second power supply branch are connected to the power supply bus 200. The main control module 600 is connected to the controlled terminal of the first switch module 510 and the controlled terminal of the second switch module 520, respectively. The temperature control module 700 is connected to the controlled terminal of the first switch module 510 and the controlled terminal of the second switch module 520, respectively.

[0033] Among them, the axial flow fan 530 is usually installed on the wall of the nacelle cabinet or the surface of the radiator to blow air into the internal space of the nacelle cabinet and the transformer winding as a whole. The blades of the axial flow fan 530 drive the airflow to flow parallel along the axial direction. It has the characteristics of high air volume and low air pressure, and is suitable for direct heat dissipation of large flow. The airflow covers a large area but has weak penetration.

[0034] The centrifugal fan 540 is installed in the heat dissipation duct inside the transformer winding, such as in a forced oil circulation radiator with a guide shroud. The centrifugal fan 540 drives the airflow for directional cooling and concentrates the airflow towards the transformer winding. The impeller of the centrifugal fan 540 is turbine-shaped. The airflow enters the impeller axially and is then turned 90° radially after being acted upon by centrifugal force. It has the characteristics of medium and low air volume and high air pressure, which can overcome system resistance and provide strong penetrating airflow.

[0035] Therefore, when the temperature of the transformer winding rises, the first switch module 510 is closed first to power and start the axial fan 530, while the centrifugal fan 540 does not start. The axial fan 530 blows air to cool the engine compartment cabinet over a wide area. As the temperature rises, the second switch module 520 can be closed to start the centrifugal fan 540.

[0036] In some embodiments of this utility model, such as Figure 1 As shown, the first switch module 510 includes a first circuit breaker 511 and a first disconnecting switch 512. The first circuit breaker 511 and the first disconnecting switch 512 are connected in series to form a first series branch. The first series branch is connected to the axial flow fan 530 to form the first power supply branch. The main control module 600 and the temperature control module 700 are both connected to the controlled end of the first disconnecting switch 512 and the controlled end of the first circuit breaker 511.

[0037] Similarly, the second switch module 520 includes a second circuit breaker 521 and a second disconnector 522. The second circuit breaker 521 and the second disconnector 522 are connected in series to form a second series branch. The second series branch is connected to the centrifugal fan 540 to form the second power supply branch. The main control module 600 and the temperature control module 700 are both connected to the controlled terminal of the second disconnector 522 and the controlled terminal of the second circuit breaker 521.

[0038] Both the main control module 600 and the temperature control module 700 can control the first circuit breaker 511 or the second circuit breaker 521 to disconnect the arc of the first series branch or the second series branch through a low-voltage electrical signal, and then correspondingly turn off the first disconnecting switch 512 and the second disconnecting switch 522. When closing, the first disconnecting switch 512 and the second disconnecting switch 522 can be controlled to close first, and then the first circuit breaker 511 or the second circuit breaker 521 can be controlled to close.

[0039] In some embodiments of this utility model, the dual-channel temperature protection system further includes an overvoltage protector 550. When the voltage applied to the overvoltage protector 550 reaches the protection threshold, the overvoltage protector 550 is turned on. The overvoltage protector 550 is connected in parallel with the first power supply branch and the second power supply branch.

[0040] The overvoltage protector 550 may include an overvoltage surge protection resistor SPD and a fuse FU1 connected in series. When the voltage of the power supply bus 200 is too high, the overvoltage protector 550 is turned on to discharge electrical energy, reduce the voltage of the power supply bus 200, and prevent the fan cooling module 500 from burning out.

[0041] In some embodiments of this utility model, the dual-channel temperature protection system further includes a main circuit breaker 560, wherein the first power supply branch and the second power supply branch are connected in parallel to form a parallel branch, and the parallel branch is connected to the power supply bus 200 through the main circuit breaker 560.

[0042] The first power supply branch and the second power supply branch are connected in parallel, and the main circuit breaker 560 can control the opening and closing of the parallel branches. When the first power supply branch is closed and the second power supply branch is open, the main current flows through the axial flow fan 530. The axial flow fan 530 has a high rotation speed and blows air to cool the inside of the engine compartment cabinet. As the temperature rises, both the first and second power supply branches are closed, and the main current is split to the axial flow fan 530 and the centrifugal fan 540. The current is relatively reduced after passing through the axial flow fan 530. At this time, the axial flow fan 530 and the centrifugal fan 540 operate together. The axial flow fan 530 blows air to cool the inside of the engine compartment cabinet, while the centrifugal fan 540 blows air to cool the transformer windings more specifically, making reasonable use of electrical energy without causing excessive energy consumption. When the temperature of the windings continues to rise, the first power supply branch can be shut off, thereby increasing the current of the centrifugal fan 540 and concentrating it on blowing air to cool the transformer windings.

[0043] A protection control method for a dual-channel temperature protection system, wherein both the main control module 600 and the temperature control module 700 execute temperature control protection steps, such as... Figure 2 As shown, the temperature control protection steps include:

[0044] S910: Acquire the first temperature signal or the second temperature signal;

[0045] S920: Control the start and stop of the fan cooling module 500 based on the first temperature signal or the second temperature signal and the satisfaction of the air blowing heat dissipation conditions;

[0046] S930: When the temperature represented by the first temperature signal or the second temperature signal reaches the alarm threshold, an alarm signal is output.

[0047] S940 When the temperature represented by the first temperature signal or the second temperature signal reaches the trip threshold, a trip control command is output to control the high-voltage circuit breaker 310 to disconnect, wherein the trip threshold is greater than the alarm threshold.

[0048] The multi-channel parallel temperature protection method provides reasonable and continuous cooling, improving the reliability and stability of temperature protection.

[0049] In some embodiments of this utility model, the fan cooling module 500 includes a first switch module 510, a second switch module 520, a main circuit breaker 560, and an axial flow fan 530 and a centrifugal fan 540 disposed on the nacelle transformer 100. The first switch module 510 is connected to the axial flow fan 530 to form at least a portion of the first power supply branch, and the second switch module 520 is connected to the centrifugal fan 540 to form at least a portion of the second power supply branch. Both the first and second power supply branches are connected to the power supply bus 200. The main control module 600 is connected to the controlled terminals of the first switch module 510 and the second switch module 520, respectively. The temperature control module 700 is connected to the controlled terminals of the first switch module 510 and the second switch module 520, respectively. The first and second power supply branches are connected in parallel. To form a parallel branch, the parallel branch is connected to the power supply bus 200 through the main circuit breaker 560. The characteristic feature is that the air-blowing heat dissipation conditions include a first temperature range and a second temperature range. The first temperature range includes a first upper limit value and a first lower limit value, and the second temperature range includes a second upper limit value and a second lower limit value. The first lower limit value, the second lower limit value, the first upper limit value, and the second upper limit value are distributed from smallest to largest. The control of the start / stop of the fan cooling module 500 based on the satisfaction of the air-blowing heat dissipation conditions according to the first temperature signal or the second temperature signal includes: when the temperature represented by the first temperature signal or the second temperature signal is within the first temperature range, controlling the first switch module 510 to close to start the axial flow fan 530; when the temperature represented by the first temperature signal or the second temperature signal is within the second temperature range, controlling the second switch module 520 to close to start the centrifugal fan 540.

[0050] For example, the first temperature range can be set to 50-70℃, and the second temperature range can be set to 60-90℃. That is, the first lower limit is 50℃, the second lower limit is 60℃, the first upper limit is 70℃, and the second upper limit is 90℃. At 50-60℃, only the axial flow fan 530 operates. At 60-70℃, both the axial flow fan 530 and the centrifugal fan 540 operate. At 70-90℃, only the centrifugal fan 540 operates. Specifically, the trip threshold can also be set at 90℃. When the temperature is too high, the high-voltage circuit breaker 310 trips, but the centrifugal fan 540 and the axial flow fan 530 can still operate based on the condition that the airflow and heat dissipation conditions are met. However, when the temperature exceeds 90℃, there may be a dangerous situation, and both the centrifugal fan 540 and the axial flow fan 530 will stop operating. It is necessary to notify the staff for troubleshooting and maintenance.

[0051] In some embodiments of this utility model, the main control module 600 is connected to the axial flow fan 530 and the centrifugal fan 540 respectively, characterized in that the protection control method further includes:

[0052] When the temperature represented by the first temperature signal is greater than the second lower limit and less than the first upper limit, the first switch module 510 and the second switch module 520 are both closed, the axial flow fan 530 operates with the first operating current, and the centrifugal fan 540 operates with the second operating current.

[0053] When the temperature represented by the first temperature signal is greater than the first lower limit and less than the second lower limit, the first switch module 510 is closed and the second switch module 520 is opened. The main control module 600 adjusts the magnitude of the third working current when the axial flow fan 530 is running. The third working current is always greater than the first working current, and the third working current increases as the temperature represented by the first temperature signal increases.

[0054] When the temperature represented by the first temperature signal is greater than the first upper limit value and less than the second upper limit value, the second switch module 520 closes and the first switch module 510 opens. The main control module 600 adjusts the magnitude of the fourth working current when the centrifugal fan 540 is running. The fourth working current is always greater than the second working current, and the fourth working current increases as the temperature represented by the first temperature signal increases.

[0055] Understandably, the temperature control module 700 controls the closing or opening of the first switch module 510 and the second switch module 520 according to the control logic of the temperature control protection steps, thereby controlling the start and stop of the axial flow fan 530 and the centrifugal fan 540. The main control module 600 can control the closing or opening of the first switch module 510 and the second switch module 520 according to the control logic of the temperature control protection steps, thereby controlling the start and stop of the axial flow fan 530 and the centrifugal fan 540. A first switching transistor of a semiconductor connected in series with the axial flow fan 530 can also be set in the first power supply branch, and a second switching transistor of a semiconductor connected in series with the centrifugal fan 540 can be set in the second power supply branch. Both the first and second switching transistors are normally open. The main control module 600 can be connected to the controlled terminals of the first and second switching transistors respectively. The main control module 600 can output PWM signals to adjust the magnitude of the third and fourth operating currents.

[0056] When the temperature represented by the first temperature signal is greater than the second lower limit and less than the first upper limit, both the main control module 600 and the temperature control module 700 can directly control the first switch module 510 and the second switch module 520 to close. The main control module 600 controls the first switch tube and the second switch tube, and the axial flow fan 530 starts to run with the first operating current flowing normally. Similarly, the centrifugal fan 540 starts to run with the second operating current flowing normally.

[0057] When the temperature represented by the first temperature signal is greater than the first lower limit and less than the second lower limit, both the main control module 600 and the temperature control module 700 can control the first switch module 510 to close and the second switch module 520 to open. At this time, the main current passes through the axial fan 530. The operating current of the axial fan 530 will be much greater than the first operating current. Therefore, the main control module 600 can output a PWM signal to the first switch to modulate the operating current of the axial fan 530 to form a third operating current. When the winding temperature is low, the third operating current can be adaptively reduced but needs to be greater than the first operating current to save energy, reduce the consumption of the axial fan 530, and ensure the heat dissipation effect. As the winding temperature rises, the third operating current gradually increases until the temperature is greater than the second lower limit.

[0058] When the temperature represented by the first temperature signal is greater than the first upper limit and less than the second upper limit, both the main control module 600 and the temperature control module 700 can control the second switch module 520 to close and the first switch module 510 to open. At this time, the main current passes through the centrifugal fan 540, and the operating current of the centrifugal fan 540 will be much greater than the second operating current. The main control module 600 can output a PWM signal to the second switch to modulate the operating current of the centrifugal fan 540 to form a fourth operating current, which saves energy, reduces the consumption of the centrifugal fan 540, and also ensures the heat dissipation effect. As the winding temperature rises, the fourth operating current gradually increases.

[0059] Specifically, when the main control module 600 malfunctions, it is not necessary to control the first and second switching transistors; the temperature control module 700 can control the axial flow fan 530 and the centrifugal fan 540 to start and stop.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A dual-channel temperature protection system applied to a nacelle-type transformer, the nacelle-type transformer comprising a nacelle-type transformer and a high-voltage switchgear, the high-voltage switchgear containing a high-voltage circuit breaker, the high-voltage winding of the nacelle-type transformer being connected to the first end of the high-voltage circuit breaker, and the second end of the high-voltage circuit breaker being used for connection to electrical equipment, characterized in that... The dual-channel temperature protection system includes: A temperature acquisition module is used to be installed on a nacelle transformer to detect the temperature information of the low-voltage winding of the nacelle transformer and to generate a first temperature signal and a second temperature signal based on the temperature information. The temperature acquisition module has a first temperature output port for outputting the first temperature signal and a second temperature output port for outputting the second temperature signal. The power supply busbar is connected to the low-voltage winding to transmit electrical energy; A fan cooling module is used to blow air to cool the nacelle transformer. The power supply bus is connected to the fan cooling module to transmit electrical energy to the fan cooling module. The main control module is connected to the first temperature output port of the temperature acquisition module, the fan heat dissipation module and the high-voltage circuit breaker respectively. The main control module controls the start and stop of the fan heat dissipation module and controls the opening and closing of the high-voltage circuit breaker according to the first temperature signal. The temperature control module is connected to the second temperature output port of the temperature acquisition module, the fan heat dissipation module, and the high-voltage circuit breaker, respectively. The temperature control module controls the start and stop of the fan heat dissipation module and controls the opening and closing of the high-voltage circuit breaker according to the second temperature signal.

2. The dual-channel temperature protection system according to claim 1, characterized in that: The temperature control module is provided with an uplink transmission port, and the main control module is provided with a downlink transmission port. The uplink transmission port is connected to the downlink transmission port via a transmission cable.

3. The dual-channel temperature protection system according to claim 1, characterized in that: The fan cooling module includes a first switch module, a second switch module, and an axial flow fan and a centrifugal fan disposed in the nacelle transformer. The first switch module is connected to the axial flow fan to form at least a portion of the first power supply branch, and the second switch module is connected to the centrifugal fan to form at least a portion of the second power supply branch. Both the first power supply branch and the second power supply branch are connected to the power supply bus. The main control module is connected to the controlled terminal of the first switch module and the controlled terminal of the second switch module, respectively. The temperature control module is connected to the controlled terminal of the first switch module and the controlled terminal of the second switch module, respectively.

4. The dual-channel temperature protection system according to claim 3, characterized in that: The first switch module includes a first circuit breaker and a first disconnecting switch. The first circuit breaker and the first disconnecting switch are connected in series to form a first series branch. The first series branch is connected to an axial flow fan to form a first power supply branch. The main control module and the temperature control module are both connected to the controlled terminal of the first disconnecting switch and the controlled terminal of the first circuit breaker.

5. A dual-channel temperature protection system according to claim 3, characterized in that: The second switch module includes a second circuit breaker and a second disconnecting switch. The second circuit breaker and the second disconnecting switch are connected in series to form a second series branch. The second series branch is connected to a centrifugal fan to form a second power supply branch. The main control module and the temperature control module are both connected to the controlled terminal of the second disconnecting switch and the controlled terminal of the second circuit breaker.

6. A dual-channel temperature protection system according to claim 3, characterized in that: It also includes an overvoltage protector. When the voltage applied to the overvoltage protector reaches the protection threshold, the overvoltage protector is turned on. The overvoltage protectors are all connected in parallel with the first power supply branch and the second power supply branch.

7. A dual-channel temperature protection system according to claim 3, characterized in that: It also includes a main circuit breaker, and the first power supply branch and the second power supply branch are connected in parallel to form a parallel branch, which is connected to the power supply bus through the main circuit breaker.

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