Dual-channel temperature protection system and protection control method

Abstract

The invention discloses a dual-channel temperature protection system and a protection control method, the dual-channel temperature protection system comprises a temperature acquisition module, a power supply bus, a fan heat dissipation module, a main control module and a temperature control module, the temperature acquisition module is provided with a first temperature output port for outputting a first temperature signal and a second temperature output port for outputting a second temperature signal; the power supply bus is connected with the fan heat dissipation module, the main control module is connected with a first temperature output port of the temperature acquisition module, the fan heat dissipation module and the high-voltage circuit breaker, and the main control module controls start and stop of the fan heat dissipation module and controls on-off of the high-voltage circuit breaker according to a first temperature signal. The temperature control module is connected with a second temperature output port of the temperature acquisition module, the fan heat dissipation module and the high-voltage circuit breaker, the temperature control module controls start and stop of the fan heat dissipation module and controls on and off of the high-voltage circuit breaker according to a second temperature signal, the design is reasonable, continuous cooling is achieved, and the reliability and stability of temperature protection are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control and protection of electrical equipment, and in particular to a dual-channel temperature protection system and a protection control method. Background Art

[0002] With the popularization of new energy, wind turbine nacelle-type transformer devices are widely used. Existing nacelle-type transformer devices 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 start-up of the fan in the nacelle-type transformer according to the temperature conditions, and issues early warnings and takes corresponding measures under continuous high temperatures. However, due to the harsh environment in which the nacelle-type transformer is located, the control system must take into account various control logics. When any link fails, the control system and staff do not take effective treatment plans, and the nacelle-type transformer and related electrical equipment may be burned. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a dual-channel temperature protection system and protection control method, a multi-channel parallel temperature protection mode, reasonable and continuous temperature reduction, and improved reliability and stability of temperature protection.

[0004] According to a first aspect of the present invention, a dual-channel temperature protection system is applied to a nacelle-type transformer device, wherein the nacelle-type transformer device includes a nacelle-type transformer and a high-voltage switchgear. A high-voltage circuit breaker is provided in the high-voltage switchgear. The high-voltage winding of the nacelle-type transformer is connected to the head end of the high-voltage circuit breaker, and the tail end of the high-voltage circuit breaker is used to connect to the electrical equipment. The dual-channel temperature protection system includes: a temperature acquisition module, which is used to be provided in the nacelle-type transformer to detect the temperature information of the low-voltage winding of the nacelle-type transformer and to form a first temperature signal and a second temperature signal according to 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. Output port; a power supply busbar, connected to the low-voltage winding to transmit electric energy; a fan heat dissipation module, used for blowing air to dissipate heat for the nacelle-type transformer, the power supply busbar being connected to the fan heat dissipation module to transmit electric energy to the fan heat dissipation module; a main control module, respectively connected to the first temperature output port of the temperature acquisition module, the fan heat dissipation module and the high-voltage circuit breaker, the main control module controls the start and stop of the fan heat dissipation module and controls the on and off of the high-voltage circuit breaker according to the first temperature signal; a temperature control module, respectively connected to the second temperature output port of the temperature acquisition module, the fan heat dissipation module and the high-voltage circuit breaker, the temperature control module controls the start and stop of the fan heat dissipation module and controls the on and off 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] The dual-channel temperature protection system of the present invention is additionally provided with a temperature control module. The main control module and the temperature control module are independently processed in parallel. The temperature acquisition module detects the temperature information of the low-voltage winding of the nacelle-type transformer and forms a first temperature signal and a second temperature signal according to the temperature information. The first temperature signal is output to the main control module, and the second temperature signal is output to the temperature control module. When the temperature of the low-voltage winding of the nacelle-type transformer rises, either the main control module or the temperature control module can control the fan heat dissipation module to start, so as to blow air and dissipate heat for the nacelle-type transformer. When the temperature continues to rise and reaches a dangerous temperature, either the main control module or the temperature control module can control the high-voltage circuit breaker to open the circuit, stop the output of the high-voltage side, thereby reducing the temperature of the low-voltage winding. Moreover, since the fan heat dissipation module is powered by the low-voltage winding, the fan heat dissipation module can also maintain operation after the high-voltage circuit breaker is opened, thereby ensuring that heat can be quickly dissipated. The multi-channel parallel temperature protection mode of the present design achieves reasonable and continuous cooling, thereby improving the reliability and stability of temperature protection.

[0007] According to some embodiments of the present invention, the temperature control module is provided with an uplink transmission port, and the main control module is provided with a downlink transmission port, and the uplink transmission port is connected to the downlink transmission port via a transmission cable.

[0008] According to some embodiments of the present invention, the fan heat dissipation module includes a first switch module, a second switch module, and the axial fan and centrifugal fan arranged in a nacelle-type transformer, the first switch module is connected to the axial fan to constitute at least part of the first power supply branch, the second switch module is connected to the centrifugal fan to constitute at least part of the second power supply branch, the first power supply branch and the second power supply branch are both connected to the power supply bus, the main control module is respectively connected to the controlled end of the first switch module and the controlled end of the second switch module, and the temperature control module is respectively connected to the controlled end of the first switch module and the controlled end of the second switch module.

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

[0011] According to some embodiments of the present invention, the dual-channel temperature protection system also includes an overvoltage protector. When the voltage applied to the overvoltage protector reaches a 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, 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] According to the protection control method of the second aspect of the present invention, it is applied to the dual-channel temperature protection system disclosed in any of the above embodiments. The protection control method includes that the main control module and the temperature control module both perform temperature control protection steps, and the temperature control protection steps include: obtaining a first temperature signal or a second temperature signal; controlling the start and stop of the fan heat dissipation module based on the satisfaction of the blowing heat dissipation conditions according to the first temperature signal or the second temperature signal; when the temperature represented by the first temperature signal or the second temperature signal reaches the alarm threshold, outputting an alarm signal; when the temperature represented by the first temperature signal or the second temperature signal reaches the tripping threshold, outputting a tripping control instruction to control the high-voltage circuit breaker to disconnect, wherein the tripping threshold is greater than the alarm threshold.

[0014] The protection control method according to the embodiment of the present invention has at least the following beneficial effects:

[0015] The protection control method of the present invention adopts a multi-channel parallel temperature protection mode, reduces the temperature reasonably and continuously, and improves the reliability and stability of the temperature protection.

[0016] According to some embodiments of the present invention, the fan heat dissipation module includes a first switch module, a second switch module, a main circuit breaker, and the axial fan and centrifugal fan arranged in a nacelle-type transformer, the first switch module is connected to the axial fan to form at least part of the first power supply branch, the second switch module is connected to the centrifugal fan to form at least part of the second power supply branch, the first power supply branch and the second power supply branch are both connected to the power supply bus, the main control module is respectively connected to the controlled end of the first switch module and the controlled end of the second switch module, the temperature control module is respectively connected to the controlled end of the first switch module and the controlled end of the second switch module, 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 through the The main circuit breaker is connected to the power supply bus, and is characterized in that the air blowing heat dissipation condition includes 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, 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 small to large, and the control of the start and stop of the fan heat dissipation module based on the satisfaction of the air blowing heat dissipation condition 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 in the first temperature range, controlling the first switch module to close to start the axial flow fan; when the temperature represented by the first temperature signal or the second temperature signal is in the second temperature range, controlling the second switch module to close to start the centrifugal fan.

[0017] According to some embodiments of the present invention, the main control module is connected to the axial fan and the centrifugal fan, respectively, and is characterized in that the protection control method further includes: when the temperature represented by the first temperature signal is greater than the second lower limit value and less than the first upper limit value, controlling the first switch module and the second switch module to be closed, the axial fan operates with the first working current, and the centrifugal fan operates with the second working current; when the temperature represented by the first temperature signal is greater than the first lower limit value and less than the second lower limit value, the first switch module is closed and the second switch module is disconnected, the main control module adjusts the magnitude of the third working current when the axial fan is running, the third working current is always greater than the first working current, and the third working current increases with the increase of the temperature represented by the first temperature signal; 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 is closed and the first switch module is disconnected, the main control module adjusts the magnitude of the fourth working current when the centrifugal fan is running, the fourth working current is always greater than the second working current, and the fourth working current increases with the increase of the temperature represented by the first temperature signal.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 This is a schematic diagram of the principle structure circuit of one embodiment of the dual-channel temperature protection system of the present invention;

[0021] Figure 2 This is a flow chart of one embodiment of the protection control method of the present invention.

[0022] Reference numerals:

[0023] Nacelle-type transformer 100; high-voltage winding 110; low-voltage winding 120; power supply busbar 200; high-voltage switchgear 300; high-voltage circuit breaker 310; temperature acquisition module 400; fan heat dissipation module 500; first switch module 510; first circuit breaker 511; first disconnector 512; second switch module 520; second circuit breaker 521; second disconnector 522; axial fan 530; centrifugal fan 540; overvoltage protector 550; main circuit breaker 560; main control module 600; downlink transmission port 610; temperature control module 700; uplink transmission port 710; transmission cable 800. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientations, such as the orientations or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] like Figure 1 、 2As shown, a dual-channel temperature protection system according to an embodiment of the first aspect of the present invention is applied to a nacelle-type transformer device, wherein the nacelle-type transformer device includes a nacelle-type transformer 100 and a high-voltage switchgear 300, wherein a high-voltage circuit breaker 310 is provided in the high-voltage switchgear 300, and the high-voltage winding 110 of the nacelle-type transformer 100 is connected to the head end of the high-voltage circuit breaker 310, and the tail end of the high-voltage circuit breaker 310 is used to be connected to the electrical equipment, and the dual-channel temperature protection system includes a temperature acquisition module 400, a power supply bus 200, a fan heat dissipation module 500, a main control module 600 and a temperature control module 700, wherein the temperature acquisition module 400 is used to be provided in the nacelle-type transformer 100 to detect the temperature information of the low-voltage winding 120 of the nacelle-type transformer 100 and to form a first temperature signal and a second temperature signal according to the temperature information, and the temperature acquisition module 400 has a first temperature output port and a second temperature output port for outputting the first temperature signal. A second temperature output port for outputting a second temperature signal, the power supply bus 200 is connected to the low-voltage winding 120 to transmit electric energy, the fan heat dissipation module 500 is used to blow air to dissipate heat for the nacelle-type transformer 100, the power supply bus 200 is connected to the fan heat dissipation module 500 to transmit electric energy to the fan heat dissipation module 500, the main control module 600 is respectively connected to the first temperature output port of the temperature acquisition module 400, the fan heat dissipation module 500 and the high-voltage circuit breaker 310, the main control module 600 controls the start and stop of the fan heat dissipation module 500 and controls the on and off of the high-voltage circuit breaker 310 according to the first temperature signal, the temperature control module 700 is respectively connected to the second temperature output port of the temperature acquisition module 400, the fan heat dissipation module 500 and the high-voltage circuit breaker 310, the temperature control module 700 controls the start and stop of the fan heat dissipation module 500 and controls the on and off of the high-voltage circuit breaker 310 according to the second temperature signal.

[0029] Among them, the cabin-type transformer 100 includes a cabin cabinet and a transformer module located in the cabin 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 cabin cabinet or separately arranged. The high-voltage winding 110 and the high-voltage circuit breaker 310 are electrically connected through connecting sleeves and busbars provided on the cabin cabinet and the high-voltage switchgear 300.

[0030] The temperature acquisition module 400 can be set in a variety of ways. For example, the temperature acquisition module 400 includes at least one temperature acquisition unit arranged 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 of which 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.

[0031] The temperature acquisition module 400 may also include multiple temperature acquisition units arranged in the low-voltage winding 120 and roughly in close proximity to each other. The temperature acquisition units may be temperature sensors or thermocouples. One of the temperature acquisition units is provided with a first temperature output port for connecting to the main control module 600, and the other temperature acquisition unit is provided with a second temperature output port for connecting to the temperature control module 700.

[0032] Among them, the main control module 600 is usually composed 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 cabin-type 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 display screens and control buttons. Therefore, the main control module 600 has more logic control programs and the processing load will be relatively high.

[0033] The temperature control module 700 is usually composed of an MCU or a PLC and its associated circuits. The temperature control module 700 only processes the relevant data content within the temperature protection system, such as only processing the analysis of the second temperature signal, the control of the fan heat dissipation module 500, and the circuit breaker control of the high-voltage circuit breaker 310. Therefore, the processing load of the temperature control module 700 is relatively low.

[0034] The dual-channel temperature protection system of the present invention is additionally provided with a temperature control module 700. The main control module 600 and the temperature control module 700 are independently processed in parallel. The temperature acquisition module 400 detects the temperature information of the low-voltage winding 120 of the nacelle-type transformer 100 and generates a first temperature signal and a second temperature signal based on the temperature 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 heat dissipation module 500 to start when the temperature of the low-voltage winding 120 of the nacelle-type transformer 100 rises. , to blow air to dissipate heat for the nacelle-type transformer 100. When the temperature continues to rise and reaches a dangerous temperature, either the main control module 600 or the temperature control module 700 can control the high-voltage circuit breaker 310 to open the circuit, stop the output on the high-voltage side, and thus reduce the temperature of the low-voltage winding 120. Moreover, since the fan heat dissipation module 500 is powered by the low-voltage winding 120, the fan heat dissipation module 500 can also maintain operation after the high-voltage circuit breaker 310 is opened, ensuring that heat can be quickly dissipated. The multi-channel parallel temperature protection method of this design achieves reasonable and continuous cooling, thereby improving the reliability and stability of temperature protection.

[0035] In some embodiments of the present invention, 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 via a transmission cable 800 .

[0036] When any of the communication between the temperature control module 700 and the second temperature output port or the communication between the main control module 600 and the first temperature output port fails, the temperature control module 700 and the main control module 600 can still achieve temperature data transmission and synchronization 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 hold tightly, and the temperature control module 700 uploads the temperature signal to the main control module 600, and then alarms through the main control module 600.

[0037] In some embodiments of the present invention, Figure 1 As shown, the fan heat dissipation module 500 includes a first switch module 510, a second switch module 520, and the axial fan 530 and the centrifugal fan 540 arranged in the nacelle transformer 100. The first switch module 510 is connected to the axial fan 530 to form at least part of the first power supply branch, and the second switch module 520 is connected to the centrifugal fan 540 to form at least part of the second power supply branch. The first power supply branch and the second power supply branch are both connected to the power supply bus 200. The main control module 600 is respectively connected to the controlled end of the first switch module 510 and the controlled end of the second switch module 520. The temperature control module 700 is respectively connected to the controlled end of the first switch module 510 and the controlled end of the second switch module 520.

[0038] Among them, the axial flow fan 530 is usually installed on the wall of the cabin cabinet or the surface of the radiator to blow air to the internal space of the cabin cabinet and the entire transformer winding. The blades of the axial flow fan 530 drive the airflow to flow parallel to the axis, with the characteristics of high air volume and low air pressure. It is suitable for large-flow direct heat dissipation. The airflow covers a large area but has weak penetration.

[0039] The centrifugal fan 540 is installed in the heat dissipation duct inside the transformer winding, such as in a strong oil circulation radiator with an air guide cover. The centrifugal fan 540 drives the air flow for directional cooling and drives the air flow to blow concentratedly toward the transformer winding. The impeller of the centrifugal fan 540 is turbine-shaped. The air flow enters the impeller from the axial direction and turns 90 degrees to be discharged radially after the action of centrifugal force. It has the characteristics of medium and low air volume and high air pressure, can overcome system resistance, and provide strong penetrating airflow.

[0040] Therefore, when the temperature of the transformer winding rises, the first switch module 510 is first controlled to close, power is supplied to start the axial flow fan 530, and the centrifugal fan 540 is not started. The axial flow fan 530 performs a large-scale blowing of air to dissipate heat inside the cabin cabinet. As the temperature rises, the second switch module 520 can be controlled to close and the centrifugal fan 540 can be started.

[0041] In some embodiments of the present invention, Figure 1 As shown, the first switch module 510 includes a first circuit breaker 511 and a first isolating switch 512, the first circuit breaker 511 and the first isolating 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, and the main control module 600 and the temperature control module 700 are both connected to the controlled end of the first isolating switch 512 and the controlled end of the first circuit breaker 511.

[0042] Similarly, the second switch module 520 includes a second circuit breaker 521 and a second isolating switch 522, and the second circuit breaker 521 and the second isolating switch 522 are connected in series to form a second series branch, and 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 end of the second isolating switch 522 and the controlled end of the second circuit breaker 521.

[0043] 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 through a low-voltage electrical signal to extinguish the arc and disconnect the first series branch or the second series branch, and then correspondingly turn off the first isolating switch 512 and the second isolating switch 522. When closing, the first isolating switch 512 and the second isolating 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.

[0044] In some embodiments of the present invention, the dual-channel temperature protection system also 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, and the overvoltage protector 550 is connected in parallel with the first power supply branch and the second power supply branch.

[0045] The overvoltage protector 550 may include an overvoltage surge 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 the electric energy, reduce the voltage of the power supply bus 200, and prevent the fan cooling module 500 from burning out.

[0046] In some embodiments of the present invention, the dual-channel temperature protection system further includes a main circuit breaker 560 , 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 .

[0047] The first power supply branch and the second power supply branch are connected in parallel, and the main circuit breaker 560 can control the on and off of the parallel branches. When the first power supply branch is closed and the second power supply branch is disconnected, the main current flows through the axial flow fan 530. The axial flow fan 530 has a high speed and blows air to dissipate heat inside the cabin cabinet. As the temperature rises, the first power supply branch and the second power supply branch are both closed, and the main current is diverted to the axial flow fan 530 and the centrifugal fan 540. The main 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 dissipate heat inside the cabin cabinet, while the centrifugal fan 540 blows air to dissipate heat more specifically on the transformer winding, making rational use of electrical energy without causing excessive consumption of electrical energy. When the temperature of the winding continues to rise, the first power supply branch can be turned off at this time, thereby increasing the current of the centrifugal fan 540 and concentrating on blowing air to dissipate heat for the transformer winding.

[0048] According to the protection control method of the second embodiment of the present invention, which is applied to the dual-channel temperature protection system disclosed in any of the above embodiments, the protection control method includes the main control module 600 and the temperature control module 700 both performing temperature control protection steps, such as Figure 2 As shown, the temperature control protection step includes:

[0049] S910: Acquire a first temperature signal or a second temperature signal;

[0050] S920, controlling the start and stop of the fan heat dissipation module 500 based on whether the air blowing heat dissipation condition is satisfied according to the first temperature signal or the second temperature signal;

[0051] S930: When the temperature represented by the first temperature signal or the second temperature signal reaches an alarm threshold, output an alarm signal;

[0052] S940: When the temperature represented by the first temperature signal or the second temperature signal reaches a tripping threshold, output a tripping control instruction to control the high-voltage circuit breaker 310 to disconnect, wherein the tripping threshold is greater than the alarm threshold.

[0053] The protection control method of the present invention adopts a multi-channel parallel temperature protection mode, reduces the temperature reasonably and continuously, and improves the reliability and stability of the temperature protection.

[0054] In some embodiments of the present invention, the fan heat dissipation module 500 includes a first switch module 510, a second switch module 520, a main circuit breaker 560, and the axial fan 530 and the centrifugal fan 540 arranged in the nacelle transformer 100, the first switch module 510 is connected to the axial fan 530 to form at least part of the first power supply branch, the second switch module 520 is connected to the centrifugal fan 540 to form at least part of the second power supply branch, the first power supply branch and the second power supply branch are both connected to the power supply bus 200, the main control module 600 is respectively connected to the controlled end of the first switch module 510 and the controlled end of the second switch module 520, the temperature control module 700 is respectively connected to the controlled end of the first switch module 510 and the controlled end of the second switch module 520, the first power supply branch and the second power supply branch are connected in parallel to A parallel branch is formed, and the parallel branch is connected to the power supply bus 200 through the main circuit breaker 560, and is characterized in that the air blowing heat dissipation condition includes 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, and the first lower limit value, the second lower limit value, the first upper limit value and the second upper limit value are distributed from small to large. In the control of the start and stop of the fan heat dissipation module 500 based on the satisfaction of the air blowing heat dissipation condition according to the first temperature signal or the second temperature signal, the method includes: when the temperature represented by the first temperature signal or the second temperature signal is in the first temperature range, controlling the first switch module 510 to close so that the axial flow fan 530 is started; when the temperature represented by the first temperature signal or the second temperature signal is in the second temperature range, controlling the second switch module 520 to close so that the centrifugal fan 540 is started.

[0055] For example, the first temperature range can be set at 50-70°C, and the second temperature range can be set at 60-90°C, that is, the first lower limit value is 50°C, the second lower limit value is 60°C, the first upper limit value is 70°C, and the second upper limit value is 90°C. At 50-60°C, only the axial flow fan 530 is running, at 60-70°C, both the axial flow fan 530 and the centrifugal fan 540 are running, and at 70-90°C, only the centrifugal fan 540 is running. Specifically, the tripping threshold can also be set at 90°C. When the temperature is too high, the high-voltage circuit breaker 310 is disconnected, but the centrifugal fan 540 and the axial flow fan 530 can still run based on the satisfaction of the blowing and heat dissipation conditions. When the temperature exceeds 90°C, a dangerous situation may occur, and the centrifugal fan 540 and the axial flow fan 530 will stop running. Specifically, it is necessary to notify the staff to conduct investigation and maintenance.

[0056] In some embodiments of the present invention, the main control module 600 is connected to the axial flow fan 530 and the centrifugal fan 540 respectively, and the protection control method further includes:

[0057] 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 controlled to be closed, the axial fan 530 operates at the first operating current, and the centrifugal fan 540 operates at the second operating current;

[0058] 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 open, and the main control module 600 adjusts the magnitude of the third operating current when the axial flow fan 530 is running. The third operating current is always greater than the first operating current, and the third operating current increases as the temperature represented by the first temperature signal increases.

[0059] 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 is closed and the first switch module 510 is disconnected, and 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 with the increase of the temperature represented by the first temperature signal.

[0060] It can be understood that the temperature control module 700 only 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 step, thereby controlling the start and stop of the axial fan 530 and the centrifugal fan 540, while 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 step, thereby controlling the start and stop of the axial fan 530 and the centrifugal fan 540. A first semiconductor switch tube connected in series with the axial fan 530 can also be provided in the first power supply branch, and a second semiconductor switch tube connected in series with the centrifugal fan 540 can be provided in the second power supply branch. The first switch tube and the second switch tube are both in a normally open state. The main control module 600 can be connected to the controlled end of the first switch tube and the controlled end of the second switch tube respectively, and the main control module 600 can output a PWM signal to adjust the size of the third working current and the fourth working current.

[0061] When the temperature represented by the first temperature signal is greater than the second lower limit value and less than the first upper limit value, 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 fan 530 starts to operate according to the first working current flowing normally. Similarly, the centrifugal fan 540 starts to operate according to the second working current flowing normally.

[0062] When the temperature represented by the first temperature signal is greater than the first lower limit and less than the second lower limit, the main control module 600 and the temperature control module 700 can both control the first switch module 510 to close and the second switch module 520 to disconnect. At this time, the main current all passes through the axial fan 530, and the working current of the axial fan 530 will be much greater than the first working current. Therefore, the main control module 600 can output a PWM signal to the first switch tube to modulate the working current of the axial fan 530 to form a third working current. When the winding temperature is low, the third working current can be adaptively reduced but needs to be greater than the first working current, saving energy and reducing the consumption of the axial fan 530. At the same time, it can also ensure the heat dissipation effect. As the winding temperature rises, the third working current gradually increases until the temperature is greater than the second lower limit.

[0063] 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 main control module 600 and the temperature control module 700 can both control the second switch module 520 to close and the first switch module 510 to disconnect. At this time, the main current all passes through the centrifugal fan 540, and the working current of the centrifugal fan 540 will be much greater than the second working current. The main control module 600 can output a PWM signal to the second switch tube to modulate the working current of the centrifugal fan 540 to form a fourth working current, saving electricity and reducing the consumption of the centrifugal fan 540, while also ensuring the heat dissipation effect. As the winding temperature rises, the fourth working current gradually increases.

[0064] Specifically, when the main control module 600 fails, there is no need to control the first switch tube and the second switch tube, and only the temperature control module 700 controls the start and stop of the axial flow fan 530 and the centrifugal fan 540.

[0065] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A dual-channel temperature protection system is applied to a nacelle-type transformer device, wherein the nacelle-type transformer device includes a nacelle-type transformer and a high-voltage switchgear. A high-voltage circuit breaker is provided in the high-voltage switchgear. The high-voltage winding of the nacelle-type transformer is connected to the head end of the high-voltage circuit breaker, and the tail end of the high-voltage circuit breaker is used to connect to electrical equipment. The system is characterized in that: The dual-channel temperature protection system includes: a temperature acquisition module, configured to be disposed in the nacelle transformer to detect temperature information of a 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 having a first temperature output port for outputting the first temperature signal and a second temperature output port for outputting the second temperature signal; Power supply bus, connected to the low voltage winding to transmit electrical energy; A fan heat dissipation module is used to blow air to dissipate heat for the nacelle-type transformer. The power supply bus is connected to the fan heat dissipation module to transmit electrical energy to the fan heat dissipation module. A main control module is respectively connected to the first temperature output port of the temperature acquisition module, the fan heat dissipation module and the high-voltage circuit breaker. The main control module controls the start and stop of the fan heat dissipation module and the on and off of the high-voltage circuit breaker according to the first temperature signal. A temperature control module is respectively connected to the second temperature output port of the temperature acquisition module, the fan heat dissipation module and the high-voltage circuit breaker. The temperature control module controls the start and stop of the fan heat dissipation module and the on and off of the high-voltage circuit breaker according to the second temperature signal.

2. A 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 through a transmission cable.

3. The dual-channel temperature protection system according to claim 1, characterized in that: The fan heat dissipation module includes a first switch module, a second switch module, and the axial fan and centrifugal fan arranged in the nacelle transformer. The first switch module is connected to the axial fan to form at least part of the first power supply branch, and the second switch module is connected to the centrifugal fan to form at least part of the second power supply branch. The first power supply branch and the second power supply branch are both connected to the power supply bus. The main control module is respectively connected to the controlled end of the first switch module and the controlled end of the second switch module, and the temperature control module is respectively connected to the controlled end of the first switch module and the controlled end of the second switch module.

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

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

6. The 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 a 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.

7. The dual-channel temperature protection system according to claim 3, characterized in that: It also includes a main circuit breaker, 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.

8. A protection control method, applied to the dual-channel temperature protection system according to claim 1, characterized in that: The protection control method includes the main control module and the temperature control module both performing a temperature control protection step, and the temperature control protection step includes: Acquiring a first temperature signal or a second temperature signal; Controlling the start and stop of the fan heat dissipation module based on whether the air blowing heat dissipation condition is met according to the first temperature signal or the second temperature signal; When the temperature represented by the first temperature signal or the second temperature signal reaches an alarm threshold, an alarm signal is output; When the temperature represented by the first temperature signal or the second temperature signal reaches a tripping threshold, a tripping control instruction is output to control the high-voltage circuit breaker to disconnect, wherein the tripping threshold is greater than the alarm threshold.

9. A protection and control method according to claim 8, wherein the fan heat dissipation module includes a first switch module, a second switch module, a main circuit breaker, and the axial flow fan and the centrifugal fan arranged in the nacelle transformer, the first switch module is connected to the axial flow fan to form at least part of the first power supply branch, the second switch module is connected to the centrifugal fan to form at least part of the second power supply branch, the first power supply branch and the second power supply branch are both connected to the power supply bus, the main control module is respectively connected to the controlled end of the first switch module and the controlled end of the second switch module, the temperature control module is respectively connected to the controlled end of the first switch module and the controlled end of the second switch module, 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, characterized in that The air blowing heat dissipation condition includes a first temperature range and a second temperature range, the first temperature range includes a first upper limit and a first lower limit, the second temperature range includes a second upper limit and a second lower limit, the first lower limit, the second lower limit, the first upper limit, and the second upper limit are distributed from small to large, and controlling the start and stop of the fan heat dissipation module based on whether the air blowing heat dissipation condition is satisfied 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 to close so as to start the axial flow fan; When the temperature represented by the first temperature signal or the second temperature signal is within the second temperature range, the second switch module is controlled to be closed to start the centrifugal fan.

10. A protection control method according to claim 9, wherein the main control module is connected to the axial flow fan and the centrifugal fan respectively, characterized in that: The protection control method further includes: When the temperature represented by the first temperature signal is greater than the second lower limit value and less than the first upper limit value, the first switch module and the second switch module are controlled to be closed, the axial fan operates at the first working current, and the centrifugal fan operates at the second working current; 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 is closed and the second switch module is opened, and the main control module adjusts the magnitude of the third working current when the axial flow fan is running. The third working current is always greater than the first working current, and the third working current increases with the increase of the temperature represented by the first temperature signal; 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 is closed and the first switch module is disconnected, and the main control module adjusts the magnitude of the fourth working current when the centrifugal fan is running. The fourth working current is always greater than the second working current, and the fourth working current increases with the increase of the temperature represented by the first temperature signal.

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