Cable fault early warning system for distribution room

Abstract

The utility model relates to a cable fault early warning system for a distribution room. The cable fault early warning system comprises a power supply device and an alarm device which are connected. The flexible heat conduction pipe extends in the extending direction of the cable, the flexible heat conduction pipe is communicated with a sliding pipe, and a piston which slides in the axial direction of the sliding pipe and is attached to the inner wall of the sliding pipe is arranged in the sliding pipe; a fluid medium flowing along the flexible heat conduction pipe is arranged on the side, facing the flexible heat conduction pipe, of the piston, and a pressure detection device is connected to the side, away from the flexible heat conduction pipe, of the piston. The pressure detection device is respectively connected with the power supply device and the alarm device; according to the utility model, the flexible heat conduction pipe extends along the axial direction of the cable, the fluid medium flowing in the flexible heat conduction pipe absorbs the heat emitted by the cable and expands with heat and contracts with cold, and the pressure detection device detects the pressure change of the fluid medium in real time, thereby monitoring the temperature of the cable in the whole area. The cable fault early warning device is simple, efficient, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of fault early warning, in particular to a cable fault early warning system for a power distribution room. Background Art

[0002] Cables generate heat during operation. If the cable temperature is too high, it may cause cable failure or other safety accidents, especially in areas where cables are concentrated, such as distribution rooms. The mutual influence between cables is more likely to cause various failures. Moreover, if the cable is used for a long time, the insulation layer on the outside of the cable will also age and cause the insulation layer to be damaged, thereby causing various accidents.

[0003] Existing cable temperature detection devices usually use temperature sensors fixed to the cable to monitor the cable temperature. However, this method can only monitor the temperature of the cable in contact with the temperature sensor, and cannot achieve timely and effective detection of cable fault locations far away from the temperature sensor.

[0004] Therefore, the distribution room needs a device that can perform real-time monitoring of the entire cable along the direction of cable extension. Utility Model Content

[0005] In response to the deficiencies in the prior art, the utility model provides a cable fault warning system for a power distribution room, which is simple, efficient, safe, reliable and easy to operate, and which extends along the axial direction of the cable through a flexible heat-conducting pipe, through which a fluid medium flowing in the flexible heat-conducting pipe absorbs the heat emitted by the cable and expands and contracts with heat. A pressure detection device detects the pressure change of the fluid medium in real time, thereby monitoring the cable temperature in the entire area, and an alarm device issues an early warning of cable faults.

[0006] The utility model is realized through the following technical solutions, providing a cable fault warning system for a distribution room, comprising a power supply device and an alarm device connected thereto; further comprising a flexible heat-conducting pipe extending along the extension direction of the cable, the flexible heat-conducting pipe being connected to a sliding pipe, a piston being provided in the sliding pipe and slidingly sliding along the axial direction of the sliding pipe and being fitted against the inner wall of the sliding pipe; a fluid medium flowing along the flexible heat-conducting pipe being provided on the side of the piston facing the flexible heat-conducting pipe, and a pressure detection device being connected to the side of the piston away from the flexible heat-conducting pipe; the pressure detection device being respectively connected to the power supply device and the alarm device; the flexible heat-conducting pipe extending along the axial direction of the cable, the fluid medium flowing in the flexible heat-conducting pipe absorbs the heat emitted by the cable and undergoes thermal expansion and contraction, the pressure change of the fluid medium being detected in real time by the pressure detection device, thereby monitoring the cable temperature in the entire area, and giving an early warning of the cable fault through the alarm device, thereby providing a simple, efficient, safe, reliable and easy-to-operate cable fault warning system for a distribution room.

[0007] As an optimization, the pressure detection device adopts an air pressure sensor; a sealed chamber is formed between the side of the piston facing the pressure detection device and the sliding tube, a gaseous medium is provided in the sealed chamber, and the detection end of the air pressure sensor is located in the sealed chamber; the pressure of the fluid medium is transmitted through the gaseous medium in the sealed chamber, avoiding direct connection between the piston and the pressure detection device, thereby affecting the accuracy of pressure detection.

[0008] As an optimization, the piston is made of insulating material and a vacuum chamber is opened inside the piston; the heat of the fluid medium transmitted to the pressure detection device through the piston is reduced through the thermal insulation setting of the piston, thereby reducing the impact of the heat of the fluid medium on pressure detection.

[0009] As an optimization, the sliding tube includes an inner wall and an outer wall extending along the direction of piston movement, and a vacuum chamber is formed between the inner wall and the outer wall; the vacuum chamber reduces the heat conducted by the fluid medium through the sliding tube to the pressure detection device, thereby reducing the impact of the heat of the fluid medium on pressure detection.

[0010] The beneficial effects of the present invention are as follows: the flexible heat-conducting tube extends axially along the cable, the fluid medium flowing in the flexible heat-conducting tube absorbs the heat emitted by the cable and expands and contracts with heat, the pressure detection device detects the pressure change of the fluid medium in real time, thereby monitoring the cable temperature in the entire area, and the alarm device issues an early warning of cable faults, thereby providing a simple, efficient, safe, reliable and easy-to-operate cable fault early warning system for distribution rooms; the pressure of the fluid medium is transmitted by the gaseous medium in the sealed chamber, thereby avoiding direct connection between the piston and the pressure detection device, thereby affecting the accuracy of pressure detection; the heat conducted to the pressure detection device by the fluid medium is reduced by the heat insulation setting of the piston and the vacuum chamber on the sliding pipe, thereby reducing the influence of the heat of the fluid medium on pressure detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the utility model (1);

[0012] Figure 2 This is a schematic diagram of the structure of the utility model (II);

[0013] As shown in the figure:

[0014] 1. Cable, 2. Power supply device, 3. Alarm device, 4. Flexible heat pipe, 5. Sliding pipe, 6. Piston, 7. Fluid medium, 8. Pressure detection device, 9. Gaseous medium, 10. Fixing device, 501. Inner wall, 502. Outer wall, 801. Air pressure sensor. DETAILED DESCRIPTION

[0015] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0016] Example 1:

[0017] like Figure 1 The cable fault early warning system for a power distribution room of the present invention shown in the figure includes a power supply device 2 and an alarm device 3 connected to each other; it also includes a flexible heat-conducting pipe 4 extending along the extension direction of the cable 1, the flexible heat-conducting pipe 4 is connected to a sliding pipe 5, and a piston 6 is provided in the sliding pipe 5 which slides axially along the sliding pipe 5 and is fitted with the inner wall 501 of the sliding pipe 5; a fluid medium 7 flowing along the flexible heat-conducting pipe 4 is provided on the side of the piston 6 facing the flexible heat-conducting pipe 4, and a pressure detection device 8 is connected to the side of the piston 6 away from the flexible heat-conducting pipe 4; the pressure detection device 8 is respectively connected to the power supply device 2 and the alarm device 3.

[0018] It also includes a connected communication device and a positioning device, which are respectively connected to the power supply device 2, and the communication device is connected to the pressure detection device 8; the communication device is used to remotely notify the staff, and the positioning device is used by the staff to confirm the distribution box where the cable 1 fails. The alarm device 3 uses an alarm indicator light to help the staff quickly identify the failed cable 1; the flexible heat pipe 4 can be made of a variety of different materials such as soft silicone material, metal flexible heat conductive material and other composite materials; the sliding pipe 5 is located on the side of the flexible heat pipe 4 away from the cable 1; the flexible heat pipe 4 It can be fixed to the cable 1 along the extension direction of the cable 1 by a fixing device 10 such as a cable tie; according to the provisions of the national standard "Test Methods for Wires and Cables 1" GB / T3048.2-2013, the surface temperature of the cable 1 should be below its rated temperature. The specific standards are as follows: the surface temperature of the PVC insulated cable 1 should generally not exceed 70°C, and the short-term allowable temperature is 160°C; the surface temperature of the XLPE insulated cable 1 should generally not exceed 90°C, and the short-term allowable temperature is 250°C, etc.; the fluid medium 7 can be a liquid or gaseous substance that complies with the thermal expansion and contraction within the load temperature of the cable 1.

[0019] The flexible heat-conducting tube 4 is fixed to the cable 1 in sequence along the extension direction of the cable 1; the surface temperature of the cable 1 increases and heat is dissipated, and the heat is transferred to the fluid medium 7 through the flexible heat-conducting tube 4. The fluid medium 7 expands due to the heat and exerts a certain pressure on the piston 6. Under the action of the pressure, the piston 6 moves axially along the sliding tube 5 toward the pressure detection device 8, and the pressure exerted by the piston 6 on the pressure detection device 8 increases, so that the pressure detection device 8 monitors the pressure changes of the fluid medium 7 in real time; the surface temperature of the cable 1 decreases, and the fluid medium 7 dissipates heat through the flexible heat-conducting tube 4 until it reaches the same temperature as the surface temperature of the cable 1. The fluid medium 7 contracts due to the cold and exerts a certain suction force on the piston 6. Under the action of the suction force, the piston 6 moves axially along the sliding tube 5 toward the flexible heat-conducting tube 4, and the pressure exerted by the piston 6 on the pressure detection device 8 decreases, so that the pressure detection device 8 monitors the pressure changes of the fluid medium 7 in real time.

[0020] A failure in cable 1 causes the surface temperature of cable 1 to rise, which causes the fluid medium 7 to expand due to heat and increase the pressure applied to the pressure detection device 8 through the piston 6. The pressure detection device 8 detects that the fluid medium 7 is in a high-pressure state and sends a signal. After receiving the signal, the alarm device 3 sends an alarm to notify the staff.

[0021] like Figure 1 The pressure detection device 8 shown uses an air pressure sensor 801; a sealed chamber is formed between the side of the piston 6 facing the pressure detection device 8 and the sliding tube 5, and a gaseous medium 9 is provided in the sealed chamber, and the detection end of the air pressure sensor 801 is located in the sealed chamber; at room temperature, the pressure on both sides of the piston 6 is the same. When the fluid medium 7 contracts due to cooling, the gaseous medium 9 plays a certain resetting role on the piston 6.

[0022] The fluid medium 7 expands due to heat, and the pressure on the side of the piston 6 close to the gaseous medium 9 is less than the pressure on the side of the piston 6 close to the fluid medium 7. Under the action of the pressure difference, the piston 6 moves axially along the sliding tube 5 toward the pressure detection device 8, and the piston 6 compresses the gaseous medium 9. The air pressure sensor 801 detects that the air pressure in the sealed chamber increases, so that the pressure detection device 8 monitors the pressure changes of the fluid medium 7 in real time; the fluid medium 7 contracts due to cooling, and the pressure on the side of the piston 6 close to the gaseous medium 9 is greater than the pressure on the side of the piston 6 close to the fluid medium 7. Under the action of the pressure difference, the piston 6 moves axially along the sliding tube 5 toward the flexible heat-conducting tube 4, and the gaseous medium 9 in the sealed chamber expands. The air pressure sensor 801 detects that the air pressure in the sealed chamber decreases, so that the pressure detection device 8 monitors the pressure changes of the fluid medium 7 in real time.

[0023] like Figure 1 The piston 6 shown is made of heat-insulating material, and a vacuum chamber is provided inside the piston 6 ; the piston 6 isolates the fluid medium 7 from heat conduction.

[0024] like Figure 1 The sliding tube 5 shown includes an inner wall 501 and an outer wall 502 extending along the movement direction of the piston 6. A vacuum chamber is formed between the inner wall 501 and the outer wall 502; the vacuum chamber isolates the fluid medium 7 from heat conduction.

[0025] During actual production, the flexible heat pipe 4 is sequentially fixed to the cable 1 along its extension direction. The surface temperature of the cable 1 increases and heat is dissipated. The heat is transferred to the fluid medium 7 through the flexible heat pipe 4. The fluid medium 7 expands due to the heat, and the pressure on the side of the piston 6 near the gaseous medium 9 is less than the pressure on the side of the piston 6 near the fluid medium 7. Under the action of the pressure difference, the piston 6 moves axially along the slide tube 5 toward the pressure detection device 8. The piston 6 compresses the gaseous medium 9. The air pressure sensor 801 detects the increase in air pressure in the sealed chamber, and the pressure detection device 8 monitors the pressure change of the fluid medium 7 in real time. The surface temperature of the cable 1 decreases, and the fluid medium 7 dissipates heat through the flexible heat pipe 4 until it reaches the same temperature as the surface temperature of the cable 1. The fluid medium 7 contracts due to the cooling, and the pressure on the side of the piston 6 near the gaseous medium 9 is greater than the pressure on the side of the piston 6 near the fluid medium 7. Under the action of the pressure difference, the piston 6 moves axially along the slide tube 5 toward the flexible heat pipe 4, causing the gaseous medium 9 in the sealed chamber to expand. The air pressure sensor 801 detects the decrease in air pressure in the sealed chamber, and the pressure detection device 8 monitors the pressure change of the fluid medium 7 in real time.

[0026] A failure in cable 1 causes the surface temperature of cable 1 to rise, thereby causing the fluid medium 7 to expand due to heat. The pressure on the side of piston 6 close to gaseous medium 9 is less than the pressure on the side of piston 6 close to fluid medium 7. Under the action of the pressure difference, piston 6 moves axially along the sliding tube 5 toward the pressure detection device 8. Piston 6 compresses the gaseous medium 9. The air pressure sensor 801 detects the increase in air pressure in the sealed chamber and sends a signal. After receiving the signal, the alarm device 3 sends an alarm to notify the staff.

[0027] Example 2:

[0028] like Figure 2 The difference between the embodiment shown and Example 1 lies in the way in which the flexible heat pipe 4 is installed on the cable 1. The flexible heat pipe 4 can be made of a material with a certain strength to ensure that the flexible heat pipe 4 does not deform and can be shaped under a certain strength, such as a metal flexible heat conductive material; the flexible heat pipe 4 is wrapped around the outer surface of the cable 1.

[0029] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A cable fault early warning system for a power distribution room, comprising a power supply device (2) and an alarm device (3) connected to each other; characterized in that: The invention also includes a flexible heat-conducting pipe (4) extending in the extension direction of the cable (1), the flexible heat-conducting pipe (4) being connected to a sliding pipe (5), a piston (6) being provided in the sliding pipe (5) and sliding along the axial direction of the sliding pipe (5) and being arranged in contact with the inner wall (501) of the sliding pipe (5); a fluid medium (7) flowing along the flexible heat-conducting pipe (4) is provided on the side of the piston (6) facing the flexible heat-conducting pipe (4), and a pressure detection device (8) is connected to the side of the piston (6) away from the flexible heat-conducting pipe (4); and the pressure detection device (8) is respectively connected to the power supply device (2) and the alarm device (3).

2. The cable fault early warning system for a power distribution room according to claim 1, characterized in that: The pressure detection device (8) uses an air pressure sensor (801); a sealed chamber is formed between the side of the piston (6) facing the pressure detection device (8) and the sliding tube (5), a gaseous medium (9) is provided in the sealed chamber, and a detection end of the air pressure sensor (801) is located in the sealed chamber.

3. The cable fault early warning system for a power distribution room according to claim 1, characterized in that: The piston (6) is made of heat-insulating material, and a vacuum chamber is provided in the piston (6).

4. The cable fault early warning system for a power distribution room according to claim 1, characterized in that: The sliding tube (5) comprises an inner wall (501) and an outer wall (502) extending along the movement direction of the piston (6), and a vacuum chamber is formed between the inner wall (501) and the outer wall (502).

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