Differential protection device based on high-reliability communication

Abstract

The invention provides a differential protection device based on high-reliability communication, and relates to the technical field of emergency circuit protection devices.The differential protection device comprises a differential protection device body, a heat dissipation channel is formed in the differential protection device body, and an air inlet of the heat dissipation channel is located in the front end of the differential protection device body; and an air outlet of the heat dissipation channel is positioned at the rear end of the differential protector main body. According to the differential protection device based on high-reliability communication provided by the invention, through the arrangement of the differential protector main body, the heat conducting plate, the temperature sensing driving structure, the fan and the switch structure, the fan can be controlled to work by using a mechanical structure according to the temperature rise change in the differential protector main body, so that the influence of high temperature on electronic equipment is reduced; according to the differential protector, the heat dissipation and cooling effects of the interior of the differential protector body can be ensured, the performance of high reliability, high efficiency, high intelligence and the like of the differential protector is ensured, the situation that work of electronic equipment is affected by high temperature is reduced, and it is ensured that heat dissipation and cooling treatment can be conducted on the differential protector body in time.

Description

Technical Field

[0001] The present invention relates to the technical field of emergency circuit protection devices, and in particular to a differential protection device based on high-reliability communication. Background Art

[0002] Differential protection of electric power is a traditional typical business scenario in the electric power industry. The principle is: each DTU (Distribution Terminal Unit, DTU) collects current values ​​according to a predetermined period and sends the current values ​​to its neighboring DTU. At the same time, each DTU also receives the current sampling value from its neighboring DTU, and compares the difference between its own sampling value and the sampling value of the neighboring DTU at the same time. If the difference exceeds a certain threshold, the DTU disconnects the circuit between it and the neighboring DTU for isolation. Only after the DTU isolates the circuit can it inspect and maintain the power grid line in time. Therefore, the communication between two adjacent DTUs is required to be stable and reliable with as low a delay as possible to ensure the effectiveness of differential protection and fast and accurate response, and to avoid misjudgment caused by communication failures as much as possible.

[0003] Existing communication differential protection devices have high reliability, high intelligence, and high efficiency. However, when the equipment fails, it may affect the performance of the differential protection device. For example, the differential protection device may contain components such as iron cores, which may cause local overheating of the iron core. Overheating can cause the detection value of the protection device to deviate seriously or malfunction, leading to failure. Under high temperature or abnormal working conditions, the mutual inductor error may increase, resulting in a decrease in the performance of the differential protection device, which will affect the high reliability and efficiency of the differential protection device. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a differential protection device based on high-reliability communication.

[0005] A differential protection device based on high-reliability communication proposed by the present invention comprises a differential protector body, a heat dissipation channel is provided in the differential protector body, an air inlet of the heat dissipation channel is located at the front end of the differential protector body, and an air outlet of the heat dissipation channel is located at the rear end of the differential protector body, a heat conduction plate is installed in the differential protector body, a part of the heat conduction plate is located in the heat dissipation channel, a blocking member capable of blocking the air outlet of the heat dissipation channel is installed on the differential protector body, a temperature sensing drive structure is installed in the differential protector body, and the temperature sensing drive structure can drive the blocking member to switch the air outlet of the heat dissipation channel;

[0006] A fan is also installed in the heat dissipation channel, and a switch structure is installed on the differential protector body. The switch structure can control the circuit disconnection of the fan, and the temperature sensing drive structure can also control the opening and closing of the switch structure.

[0007] Preferably, the blocking member comprises a blocking plate, which is slidably mounted on the differential protector body, and the blocking plate can block the air outlet of the heat dissipation channel.

[0008] Preferably, the temperature-sensing driving structure comprises a sealing cylinder, a piston block, a driving rod, a heat-conducting member and a heat-conducting strip; a working groove is provided in the differential protector body, the sealing cylinder is fixedly installed in the working groove, an expansion chamber is provided in the sealing cylinder, the piston block is slidably installed in the expansion chamber, one end of the driving rod slides through one end of the sealing cylinder and is fixedly connected to the piston block, the space in the expansion chamber away from the driving rod is filled with an ethanol solution, a connecting block is fixedly installed on the blocking plate, the connecting block is fixedly installed on the end of the driving rod away from the piston block, and the connecting block can slide in the working groove;

[0009] The heat conducting element is fixedly installed in the differential protector body, one end of the heat conducting strip is fixedly connected to the heat conducting element, and the other end of the heat conducting strip passes through the sealing cylinder and is immersed in the ethanol solution;

[0010] A return spring is installed in the expansion chamber, and two ends of the return spring are respectively connected to the piston block and the inner wall of the end of the expansion chamber.

[0011] Preferably, the switch structure includes two elastic contact pieces; a switch slot is opened in the differential protector body, and the two elastic contact pieces are installed in the switch slot in an inverted eight-shaped shape. The two elastic contact pieces can abut against each other, and the two elastic contact pieces are electrically connected to the fan.

[0012] Preferably, the switch structure further comprises a separation plate, which is fixedly connected to the connection block, and the separation plate can be inserted between the two elastic contact sheets and separate the two elastic contact sheets that are pressed against each other.

[0013] Preferably, a vertical groove is provided in the differential protector body, the bottom end of the vertical groove is connected to the heat dissipation channel, part of the heat conducting plate is located in the vertical groove, and the heat conducting plate can divide the vertical groove into a U-shaped groove with both ends opening downward.

[0014] Preferably, air inlet slots are provided on both sides of the differential protector body, and the inner wall of the air inlet slot is provided with an opening connected to the vertical slot. A temperature-sensing switch component is installed on the heat-conducting plate, and the temperature-sensing switch component can block the side opening of the vertical slot. The temperature-sensing switch component can control the opening size of the side opening according to the temperature on the heat-conducting plate.

[0015] Preferably, the temperature-sensing switch element comprises a memory metal sheet; one side of the memory metal sheet is fixedly connected to the heat-conducting plate;

[0016] When the memory metal sheet is deformed by heat, the memory metal sheet bends and deforms toward the air inlet slot.

[0017] Preferably, a filter screen is installed at the opening of the vertical slot.

[0018] Preferably, an air filter is installed at the air inlet of the heat dissipation channel.

[0019] A differential protection device based on high-reliability communication proposed by the present invention has the following beneficial effects: through the set differential protector body, heat conduction plate, temperature sensing drive structure, fan and switch structure, the mechanical structure can be used to control the operation of the fan according to the temperature increase in the differential protector body, thereby reducing the impact of high temperature on electronic equipment, ensuring the heat dissipation and cooling effect inside the differential protector body, ensuring the high reliability, high efficiency, high intelligence and other performance of the differential protector, reducing the impact of high temperature on the operation of electronic equipment, and ensuring that the heat dissipation and cooling of the differential protector body can be processed in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A front structural schematic diagram of a differential protection device based on high-reliability communication proposed by the present invention;

[0021] Figure 2 A rear view structural schematic diagram of a differential protection device based on high-reliability communication proposed by the present invention;

[0022] Figure 3 A side cross-sectional view of a differential protection device based on high-reliability communication proposed by the present invention;

[0023] Figure 4 A differential protection device based on high-reliability communication proposed by the present invention Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 A schematic structural diagram of a heat-conducting member and a heat-conducting strip in a differential protection device based on high-reliability communication proposed by the present invention;

[0025] Figure 6 A schematic structural diagram of a blocking plate, a connecting block and a separating plate in a differential protection device based on high-reliability communication proposed by the present invention;

[0026] Figure 7 This is a structural cross-sectional view of a temperature-sensing drive structure in a differential protection device based on high-reliability communication proposed by the present invention;

[0027] Figure 8 A cross-sectional view of a differential protector body in a differential protection device based on high-reliability communication proposed by the present invention;

[0028] Fig. 9A differential protection device based on high-reliability communication proposed by the present invention Figure 8 Enlarged view of point B in the middle.

[0029] In the figure: 1. Differential protector body; 2. Heat dissipation channel; 3. Heat conduction plate; 4. Fan; 5. Sealing plate; 6. Sealing cylinder; 7. Piston block; 8. Driving rod; 9. Heat conduction member; 10. Heat conduction strip; 11. Connecting block; 12. Reset spring; 13. Elastic contact sheet; 14. Separation plate; 15. Memory metal sheet; 16. Filter; 17. Air filter element. DETAILED DESCRIPTION

[0030] Reference Figure 1-Figure 9 The present invention proposes a differential protection device based on high-reliability communication, including a differential protector body 1, a heat dissipation channel 2 is opened in the differential protector body 1, and the heat dissipation channel 2 is located at the bottom of both sides of the differential protector body 1. The air inlet of the heat dissipation channel 2 is located at the front end of the differential protector body 1, and an air filter element 17 is installed at the air inlet of the heat dissipation channel 2 to prevent external dust from entering the heat dissipation channel 2. The air outlet of the heat dissipation channel 2 is located on the back of the differential protector body 1. In actual situations, the differential protector body 1 is installed in an electric cabinet, and the front and rear ends of the differential protector body 1 are relatively empty, which is convenient for heat dissipation. A heat conducting plate 3 is installed in the differential protector body 1, and the heat in the differential protector body 1 can be transferred to the heat conducting plate 3. Part of the heat conducting plate 3 is located in the heat dissipation channel 2. When the cold air from the outside enters the heat dissipation channel 2 and flows, it will take away the heat on the heat conducting plate 3, thereby achieving the effect of heat dissipation. The differential protector body 1 is installed There is a sealing piece capable of sealing the air outlet of the heat dissipation channel 2, and a temperature-sensing driving structure is installed in the differential protector body 1, and the temperature-sensing driving structure can drive the sealing piece to open and close the air outlet of the heat dissipation channel 2. In actual situations, the temperature in the differential protector body 1 is within a relatively normal range during normal operation. At this time, there is no need to perform heat dissipation treatment on the differential protector body 1, so the air outlet of the heat dissipation channel 2 is sealed to reduce the entry of external dust; when an abnormality occurs, the temperature in the differential protector body 1 rises, and the temperature-sensing driving structure senses the temperature increase in the differential protector body 1, and the temperature-sensing driving structure drives the sealing piece to open the heat dissipation channel 2, so that the heat dissipation channel 2 becomes a passage, so that the air in the heat dissipation channel 2 flows, thereby taking away the temperature on the heat conducting plate 3, and performing heat dissipation and cooling treatment on the temperature in the differential protector body 1, ensuring that the electronic components in the differential protector body 1 can operate normally, and ensuring the high reliability of the differential protector.

[0031] like Figure 3As shown in , a fan 4 is also installed in the heat dissipation channel 2. The function of the fan 4 is to accelerate the air flow speed in the heat dissipation channel 2, thereby increasing the heat dissipation effect. However, in actual conditions, when the differential protector is in normal working state, there is no need to perform heat dissipation treatment on it, so the fan 4 does not need to be turned on. This requires the installation of a switch to control the operation and shutdown of the fan 4. If an electric switch is used, when the temperature inside the differential protector body 1 rises, the electric switch may fail and the fan 4 cannot be turned on. Therefore, a mechanical switch is designed. A switch structure is installed on the differential protector body 1. The switch structure can control the circuit disconnection of the fan 4, and the temperature sensing drive structure can also control the opening and closing of the switch structure. When the temperature inside the differential protector body 1 rises, the temperature sensing drive structure is affected by the temperature increase, and the switch structure is opened, so that the circuit of the fan 4 is connected. The fan 4 works to accelerate the air flow speed in the heat dissipation channel 2, achieves a better heat dissipation effect, reduces the working environment temperature of the electronic components in the differential protector body 1, and reduces the performance degradation of the components due to high temperature, thereby affecting the reliability of the differential protection device.

[0032] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown in the figure, the blocking member includes a blocking plate 5, which is slidably installed on the differential protector body 1. The blocking plate 5 can block the air outlet of the heat dissipation channel 2. The heat dissipation channel 2 has three air outlets, and the blocking plate 5 is provided with three openings that are compatible with the air outlets. When the blocking plate 5 is raised, the three openings and the three air outlets coincide with each other, and the wind in the heat dissipation channel 2 is discharged from the overlapping openings, which has the effect of heat dissipation and cooling. In this way, when the blocking plate 5 is raised to a low height, the size of the air outlet can also be ensured.

[0033] like Figure 2 , Figure 4 , Figure 5 and Figure 7As shown in, the temperature sensing drive structure includes a sealing cylinder 6, a piston block 7, a driving rod 8, a heat conducting member 9 and a heat conducting strip 10; the structure of the heat conducting member 9 is designed according to the internal structure of the differential protector body 1, the heat conducting member 9 also includes a heat conducting rod, the heat conducting rod is connected to the heat conducting member 9, and the end of the heat conducting rod away from the heat conducting member 9 extends to various places in the differential protector body 1, the differential protector body 1 is provided with a working groove, the sealing cylinder 6 is fixedly installed in the working groove, the sealing cylinder 6 is provided with an expansion chamber, the piston block 7 is slidably installed in the expansion chamber, one end of the driving rod 8 slides through one end of the sealing cylinder 6 and is fixedly connected to the piston block 7, the space in the expansion chamber away from the driving rod 8 is filled with ethanol solution, and a connecting block 11 is fixedly installed on the sealing plate 5, the connecting block 11 is fixedly installed on the end of the driving rod 8 away from the piston block 7, and the connecting block 11 can be in the working groove Slide inside; the heat conducting member 9 is fixedly installed in the differential protector body 1, one end of the heat conducting strip 10 is fixedly connected to the heat conducting member 9, and the other end of the heat conducting strip 10 passes through the sealing tube 6 and is immersed in the ethanol solution; during specific operation, the temperature inside the differential protector body 1 rises, the heat conducting member 9 transfers the temperature to the heat conducting strip 10, and the heat conducting strip 10 transfers the temperature to the ethanol solution. The ethanol solution vaporizes and expands due to the heat, and the piston block 7 slides in the expansion chamber due to the vaporization and expansion force of the ethanol solution. While sliding, the piston block 7 drives the driving rod 8 to rise synchronously, and the driving rod 8 pushes the connecting block 11 and the blocking plate 5 to rise synchronously. When the blocking plate 5 rises, the opening on the blocking plate 5 coincides with the air outlet of the heat dissipation channel 2, so that the heat dissipation channel 2 is in a smooth state, and the air can flow inside to take away the temperature on the heat conducting plate 3, thereby achieving the effect of heat dissipation and cooling.

[0034] It should be noted that the heat conducting plate 3 , the heat conducting member 9 and the heat conducting strip 10 are all made of metal.

[0035] like Figure 3 , Figure 4 and Figure 7 As shown in the figure, a return spring 12 is installed in the expansion chamber, and the two ends of the return spring 12 are respectively connected to the piston block 7 and the inner wall of the end of the expansion chamber. After the temperature in the differential protector body 1 drops, the ethanol solution liquefies, the air pressure decreases, and the rebound effect of the return spring 12 can push the piston block 7 to slide and reset in the expansion chamber.

[0036] like Figure 3 and Figure 4As shown in the figure, the switch structure includes two elastic contact pieces 13; the elastic contact pieces 13 are elastic metal pieces. When the two elastic contact pieces 13 are in contact with each other, the circuit of the fan 4 is connected, and when the two elastic contact pieces 13 are separated, the circuit of the fan 4 is disconnected. A switch slot is provided in the differential protector body 1, and the two elastic contact pieces 13 are installed in the switch slot in an inverted eight-shaped shape. The two elastic contact pieces 13 can be in contact with each other, and a power line is connected between the two elastic contact pieces 13 and the fan 4.

[0037] like Figure 3 and Figure 4 As shown in the figure, the switch structure also includes a separation plate 14, which is fixedly connected to the connecting block 11. The separation plate 14 can be inserted between the two elastic contact pieces 13 and separate the two elastic contact pieces 13 that are abutting against each other. When the connecting block 11 is raised or lowered, the separation plate 14 will be driven to rise or fall synchronously. When the separation plate 14 descends, the separation plate 14 will be inserted into the V-shaped groove formed by the two elastic contact pieces 13, and the two elastic contact pieces 13 will be separated, thereby disconnecting the circuit of the fan 4. When the temperature inside the differential protector body 1 rises, the temperature-sensing drive structure can drive the connecting block 11 and the separation plate 14 to rise synchronously, and the separation plate 14 will be pulled out from between the two elastic contact pieces 13. The two elastic contact pieces 13 will be reset and abut against each other, so that the circuit of the fan 4 is connected and starts to work to perform heat dissipation and cooling operations.

[0038] like Figure 2 , Figure 8 and Fig. 9 As shown in the figure, a vertical groove is opened in the differential protector body 1, and the bottom end of the vertical groove is connected with the heat dissipation channel 2. Part of the heat conducting plate 3 is located in the vertical groove, and the heat conducting plate 3 can divide the vertical groove into a U-shaped groove with both ends opening downward. The heat conducting plate 3 disconnects the middle of the heat dissipation channel 2, and connects the two disconnected ports to the two ends of the U-shaped groove respectively, thereby increasing the path length of the air flow. The heat conducting plate 3 is used as the inner wall of the channel, which can better take away the heat, increase the heat dissipation area, and increase the heat dissipation effect.

[0039] In actual situations, due to the size limitation of the differential protector body 1, the volume of the fan 4 installed inside it also needs to be subject to certain restrictions, so its power is limited, and the size of the air inlet of the heat dissipation channel 2 will also be limited, which will affect the flow rate in the heat dissipation channel 2 and further affect the heat dissipation effect. Therefore, the following design is adopted.

[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 8 and Fig. 9As shown in the figure, both sides of the differential protector body 1 are provided with air inlet slots, the inner wall of the air inlet slot is provided with an opening connected with the vertical slot, a temperature-sensing switch is installed on the heat-conducting plate 3, the temperature-sensing switch can block the side opening of the vertical slot, the temperature-sensing switch can control the opening size of the side opening according to the temperature on the heat-conducting plate 3, and the temperature-sensing switch includes a memory metal sheet 15; one side of the memory metal sheet 15 is fixedly connected to the heat-conducting plate 3, and in a normal state, the memory metal sheet 15 blocks the side opening of the vertical slot to reduce the entry of dust from the outside; when the memory metal sheet 15 is deformed by heat, the memory metal sheet 15 bends and deforms into the air inlet slot, and a filter 16 is installed at the opening of the vertical slot. When the internal temperature of the differential protector body 1 rises, the heat-conducting plate 3 transfers the temperature to the memory metal sheet 15, and the memory metal sheet 15 is The heat deformation enters the air inlet slot and opens the side opening of the vertical slot. At the same time, the temperature sensing drive structure works to open the air outlet of the heat dissipation channel 2, and the circuit of the fan 4 is connected. When the fan 4 is working, the outside air will enter through the air inlet of the heat dissipation channel 2 and the side opening of the vertical slot, thereby increasing the air intake volume in the heat dissipation channel 2, increasing the air flow in the heat dissipation channel 2, and increasing the heat dissipation effect. Moreover, the size of the side opening of the vertical slot changes according to the temperature height in the differential protector body 1, which can better control the heat dissipation. The mechanical structure is used to sense the temperature change to control the operation of the fan 4, the sealing plate 5 and the memory metal sheet 15, which can reduce the impact of high temperature on electrical components, and can better dissipate heat for the differential protector, thereby ensuring the high reliability, high efficiency, high intelligence and other performance of the differential protection device.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A differential protection device based on high-reliability communication, characterized in that: The invention comprises a differential protector body (1), wherein a heat dissipation channel (2) is provided in the differential protector body (1), an air inlet of the heat dissipation channel (2) is located at the front end of the differential protector body (1), and an air outlet of the heat dissipation channel (2) is located at the rear end of the differential protector body (1), a heat conduction plate (3) is installed in the differential protector body (1), a part of the heat conduction plate (3) is located in the heat dissipation channel (2), a blocking member capable of blocking the air outlet of the heat dissipation channel (2) is installed on the differential protector body (1), and a temperature sensing drive structure is installed in the differential protector body (1), and the temperature sensing drive structure can drive the blocking member to open and close the air outlet of the heat dissipation channel (2); A fan (4) is also installed in the heat dissipation channel (2), and a switch structure is installed on the differential protector body (1). The switch structure can control the circuit disconnection of the fan (4), and the temperature sensing drive structure can also control the opening and closing of the switch structure.

2. A differential protection device based on high-reliability communication according to claim 1, characterized in that: The blocking member comprises a blocking plate (5), the blocking plate (5) being slidably mounted on the differential protector body (1), and the blocking plate (5) being capable of blocking the air outlet of the heat dissipation channel (2).

3. A differential protection device based on high-reliability communication according to claim 2, characterized in that: The temperature sensing driving structure comprises a sealing cylinder (6), a piston block (7), a driving rod (8), a heat conducting member (9) and a heat conducting strip (10); a working groove is provided in the differential protector body (1), the sealing cylinder (6) is fixedly installed in the working groove, an expansion chamber is provided in the sealing cylinder (6), the piston block (7) is slidably installed in the expansion chamber, one end of the driving rod (8) slides through one end of the sealing cylinder (6) and is fixedly connected to the piston block (7), the space in the expansion chamber away from the driving rod (8) is filled with an ethanol solution, a connecting block (11) is fixedly installed on the sealing plate (5), the connecting block (11) is fixedly installed on the end of the driving rod (8) away from the piston block (7), and the connecting block (11) can slide in the working groove; The heat conducting element (9) is fixedly installed in the differential protector body (1), one end of the heat conducting strip (10) is fixedly connected to the heat conducting element (9), and the other end of the heat conducting strip (10) passes through the sealing cylinder (6) and is immersed in an ethanol solution; A return spring (12) is installed in the expansion chamber, and two ends of the return spring (12) are respectively connected to the piston block (7) and the inner wall of the end of the expansion chamber.

4. A differential protection device based on high-reliability communication according to claim 3, characterized in that: The switch structure comprises two elastic contact pieces (13); a switch slot is provided in the differential protector body (1); the two elastic contact pieces (13) are installed in the switch slot in an inverted figure eight shape; the two elastic contact pieces (13) can abut against each other; and the two elastic contact pieces (13) are electrically connected to the fan (4).

5. A differential protection device based on high-reliability communication according to claim 4, characterized in that: The switch structure also includes a separation plate (14), which is fixedly connected to the connection block (11); the separation plate (14) can be inserted between two elastic contact sheets (13) and separate the two elastic contact sheets (13) that are pressed against each other.

6. A differential protection device based on high-reliability communication according to claim 1, characterized in that: A vertical groove is provided in the differential protector body (1), the bottom end of the vertical groove is connected to the heat dissipation channel (2), a portion of the heat conducting plate (3) is located in the vertical groove, and the heat conducting plate (3) can divide the vertical groove into a U-shaped groove with both ends opening downward.

7. A differential protection device based on high-reliability communication according to claim 1, characterized in that: Air inlet slots are provided on both sides of the differential protector body (1), and an opening communicating with the vertical slot is provided on the inner wall of the air inlet slot. A temperature-sensing switch component is installed on the heat-conducting plate (3), and the temperature-sensing switch component can block the side opening of the vertical slot. The temperature-sensing switch component can control the size of the side opening according to the temperature on the heat-conducting plate (3).

8. A differential protection device based on high-reliability communication according to claim 7, characterized in that: The temperature-sensing switch element comprises a memory metal sheet (15); one side of the memory metal sheet (15) is fixedly connected to the heat-conducting plate (3); When the memory metal sheet (15) is deformed by heat, the memory metal sheet (15) bends and deforms toward the air inlet slot.

9. A differential protection device based on high-reliability communication according to claim 7, characterized in that: A filter screen (16) is installed at the opening of the vertical slot.

10. A differential protection device based on high-reliability communication according to claim 1, characterized in that: An air filter element (17) is installed at the air inlet of the heat dissipation channel (2).

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