Extra-high voltage direct current cable service life detection device

Abstract

The utility model discloses an extra-high voltage direct current cable service life detection device which comprises a traction mechanism, a cleaning mechanism is installed on one side of the traction mechanism, and a cable ultrasonic detector is installed on the top of the cleaning mechanism. The traction mechanism comprises a fixing frame, a winding drum is rotationally connected to the interior of the fixing frame, and clamping pieces are in threaded connection to the front side and the rear side of the winding drum; the cleaning mechanism comprises a cleaning head, a scraping ring is installed in the cleaning head, and a collecting cavity is formed in the portion, located on the left side of the scraping ring, of an inner cavity of the cleaning head. The device has the advantage of automation, and solves the problems that in the use process of an existing extra-high-voltage direct-current cable service life detection device, the cable is inconvenient to pull, detection of defects of different positions of the cable by workers is affected, the service life detection efficiency is reduced, a coupling medium on the surface of the cable is difficult to clean, and the service life of the cable is affected. And cable recovery is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of cable detection, in particular to a life detection device for an ultra-high voltage direct current cable. Background Art

[0002] UHV DC cable life detection device is a device dedicated to detecting the performance and expected life of cables in UHV DC transmission systems. Such devices usually integrate advanced detection technology and data analysis capabilities, mainly based on non-destructive or non-destructive testing methods, and are designed to evaluate the degradation that may occur to cables under long-term operating conditions, including insulation aging, corrosion, mechanical damage, etc., without interrupting system operation or causing damage to the cables. Non-destructive testing includes ultrasonic testing, which is used to detect internal defects in cables. Its principle is based on the differences in the propagation characteristics of ultrasonic waves in different media, as well as the reflection, refraction and attenuation effects caused by the interaction of ultrasonic waves with defects.

[0003] UHV DC cables refer to cables used in UHV DC transmission systems. These cables are capable of carrying extremely high voltages and large-capacity power transmission. UHV DC transmission technology is mainly used for long-distance, large-capacity power transmission. It is characterized by high transmission efficiency, low transmission loss, relatively small impact on the environment, and the ability to independently adjust the power flow to meet the flexible scheduling needs of the power grid. Ultrasonic testing, as a non-destructive testing technology, can detect potential problems such as insulation damage, conductor corrosion, and partial discharge inside the cable without destroying the cable structure. If these problems are not discovered in time, they may gradually worsen, eventually leading to cable failures and even power grid collapse.

[0004] During use, the existing UHV DC cable life detection device is not convenient for pulling the cable, which affects the staff's detection of defects at different positions of the cable, reduces the efficiency of life detection, and is difficult to clean the coupling medium on the cable surface, affecting the cable recycling. Utility Model Content

[0005] The utility model aims to provide a UHV DC cable life detection device, which has the advantage of automation and solves the problems that the existing UHV DC cable life detection device is inconvenient to pull the cable during use, which affects the staff's detection of defects at different positions of the cable, reduces the efficiency of life detection, and is difficult to clean the coupling medium on the cable surface, affecting the cable recovery.

[0006] To achieve the above object, the utility model provides the following technical solutions: a UHV DC cable life detection device, comprising a traction mechanism, a cleaning mechanism is installed on one side of the traction mechanism, and a cable ultrasonic detector is installed on the top of the cleaning mechanism;

[0007] The traction mechanism comprises a fixed frame, a winding drum is rotatably connected inside the fixed frame, and clamping members are threadedly connected to the front and rear sides of the winding drum;

[0008] The cleaning mechanism includes a cleaning head, a scraper ring is installed inside the cleaning head, a collecting chamber is opened in the inner cavity of the cleaning head and on the left side of the scraper ring, a delivery hole connected to the collecting chamber is opened on the surface of the cleaning head, a liquid extraction tube is installed at the bottom of the delivery hole, one end of the liquid extraction tube is connected to a liquid pump, and a liquid storage tank is provided at the bottom of the liquid pump.

[0009] As a preferred ultra-high voltage DC cable life detection device of the utility model, a reducer is fixedly connected to one side of the winding drum, a motor is fixedly connected to one side of the reducer, the motor output shaft is connected to the reducer input shaft, and the reducer output shaft is connected to one end of the winding drum.

[0010] As a preferred embodiment of the ultra-high voltage DC cable life detection device of the utility model, a base is fixedly connected to the fixing frame, and the base is fixedly connected to the bottom of the liquid storage tank.

[0011] As a preferred ultra-high voltage DC cable life detection device of the utility model, a mounting seat is fixedly connected to the top of the liquid pump, the mounting seat is installed on the top of the liquid storage tank, the liquid outlet end of the liquid pump passes through the inner cavity of the liquid storage tank, a supporting bent rod is fixedly connected to one side of the liquid storage tank, the end of the supporting bent rod away from the liquid storage tank is fixedly connected to the surface of the cleaning head, and the cable ultrasonic detector is installed on the top of the liquid storage tank.

[0012] As a preferred embodiment of the ultra-high voltage DC cable life detection device of the utility model, a valve is installed at the bottom of the front side of the liquid storage tank.

[0013] As a preferred embodiment of the ultra-high voltage DC cable life detection device of the utility model, threading holes are provided on the left side of the cleaning head and inside the scraper ring, and a chamfered portion is provided on the left side of the scraper ring.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] 1. The utility model can facilitate ultrasonic detection of defects inside the UHV DC cable by arranging a cable ultrasonic detector to detect the service life of the UHV DC cable. Before the detection, a coupling medium is coated on the surface of the UHV DC cable. The coupling medium enables the cable ultrasonic detector and the UHV DC cable to fit tightly, which is convenient for the conduction of ultrasonic waves. After the detection is completed, the UHV DC cable passes through a cleaning mechanism, which scrapes off the coupling medium on the surface of the UHV DC cable to facilitate subsequent winding and cleaning.

[0016] 2. The utility model is capable of arranging a traction mechanism, so as to facilitate the slow winding of the UHV DC cable and detect different positions of the UHV DC cable. During the operation of the traction mechanism, the output shaft of the motor drives the reducer to work, and the reducer drives the winding drum to rotate inside the fixed frame. One end of the UHV DC cable is clamped on the opposite side of two clamping members in advance, so that the winding drum can drive the UHV DC cable to be wound. During the winding process of the UHV DC cable, the cable moves slowly inside the cable ultrasonic detector and the cleaning mechanism, thereby improving the automation degree and detection efficiency of the UHV DC cable detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the main axonometric drawing of the utility model;

[0018] Figure 2 This is the main axonometric view of the traction mechanism of the utility model;

[0019] Figure 3 This is the main axonometric view of the cleaning mechanism of the utility model;

[0020] Figure 4 This is a front view and sectional isometric drawing of the cleaning head of the utility model.

[0021] In the figure: 1. traction mechanism; 101. fixed frame; 102. motor; 103. take-up drum; 104. clamping member; 105. base; 106. reducer; 2. cleaning mechanism; 201. cleaning head; 202. liquid extraction pipe; 203. liquid pump; 204. mounting seat; 205. valve; 206. liquid storage tank; 207. supporting bent rod; 208. scraper ring; 209. collecting chamber; 210. conveying hole; 3. cable ultrasonic detector. DETAILED DESCRIPTION

[0022] See also Figure 1-Figure 4 A UHV DC cable life detection device comprises a traction mechanism 1, a cleaning mechanism 2 is installed on one side of the traction mechanism 1, and a cable ultrasonic detector 3 is installed on the top of the cleaning mechanism 2.

[0023] Furthermore, the traction mechanism 1 includes a fixed frame 101 , a winding drum 103 is rotatably connected inside the fixed frame 101 , and clamping members 104 are threadedly connected to the front and rear sides of the winding drum 103 .

[0024] Furthermore, a reducer 106 is fixedly connected to one side of the winding drum 103 , a motor 102 is fixedly connected to one side of the reducer 106 , an output shaft of the motor 102 is connected to an input shaft of the reducer 106 , and an output shaft of the reducer 106 is connected to one end of the winding drum 103 .

[0025] Furthermore, a base 105 is fixedly connected to the fixing frame 101 , and the base 105 is fixedly connected to the bottom of the liquid storage tank 206 .

[0026] By setting up the traction mechanism 1, it is convenient to slowly reel up the UHV DC cable and detect different positions of the UHV DC cable. During the operation of the traction mechanism 1, the output shaft of the motor 102 drives the reducer 106 to work, and the reducer 106 drives the reel 103 to rotate inside the fixed frame 101. One end of the UHV DC cable is clamped on the opposite side of the two clamping members 104 in advance, so that the reel 103 can drive the UHV DC cable to reel up. During the reeling process of the UHV DC cable, it slowly moves inside the cable ultrasonic detector 3 and the cleaning mechanism 2, thereby improving the automation degree and detection efficiency of the UHV DC cable detection.

[0027] Furthermore, the cleaning mechanism 2 includes a cleaning head 201, a scraper ring 208 is installed inside the cleaning head 201, a collecting chamber 209 is opened in the inner cavity of the cleaning head 201 and on the left side of the scraper ring 208, a delivery hole 210 connected to the collecting chamber 209 is opened on the surface of the cleaning head 201, a liquid extraction tube 202 is installed at the bottom of the delivery hole 210, one end of the liquid extraction tube 202 is connected to a liquid pump 203, and a liquid storage tank 206 is provided at the bottom of the liquid pump 203.

[0028] Furthermore, a mounting base 204 is fixedly connected to the top of the liquid pump 203, and the mounting base 204 is installed on the top of the liquid storage tank 206. The liquid outlet end of the liquid pump 203 passes through the inner cavity of the liquid storage tank 206. A supporting bent rod 207 is fixedly connected to one side of the liquid storage tank 206. The end of the supporting bent rod 207 away from the liquid storage tank 206 is fixedly connected to the surface of the cleaning head 201, and the cable ultrasonic detector 3 is installed on the top of the liquid storage tank 206.

[0029] Furthermore, a valve 205 is installed at the bottom of the front side of the liquid storage tank 206 .

[0030] Furthermore, threading holes are provided on the left side of the cleaning head 201 and inside the scraper ring 208, and a chamfered portion is provided on the left side of the scraper ring 208.

[0031] During the operation of the cleaning mechanism 2, the cable passes through the cleaning head 201 and the scraper ring 208. The scraper ring 208 scrapes the coupling medium on the surface of the cable. The scraped coupling medium enters the collection chamber 209 and enters the liquid extraction tube 202 through the delivery hole 210. The liquid pump 203 extracts the coupling medium through the liquid extraction tube 202 and delivers it to the liquid storage tank 206 for storage. When the liquid storage tank 206 is full, the coupling medium can be released by opening the liquid storage tank 206.

[0032] By setting up the cable ultrasonic detector 3, it is possible to facilitate ultrasonic detection of defects inside the UHV DC cable to detect the service life of the UHV DC cable. Before the detection of the UHV DC cable, a coupling medium is coated on the surface of the UHV DC cable. The coupling medium allows the cable ultrasonic detector 3 and the UHV DC cable to fit tightly, which is convenient for the conduction of ultrasonic waves. After the detection is completed, the UHV DC cable passes through the cleaning mechanism 2, and the cleaning mechanism 2 scrapes the coupling medium on the surface of the UHV DC cable to facilitate subsequent winding and cleaning.

[0033] The cable ultrasonic detector 3 includes an ultrasonic transmitter, a high-voltage signal generator, a signal receiver and a data acquisition and processing unit. The ultrasonic transmitter is the core component of the device and is responsible for generating and emitting ultrasonic waves. In the detection of ultra-high voltage DC cables, the ultrasonic transmitter can efficiently convert electrical energy into ultrasonic energy. The ultrasonic transmitter can be attached to the surface of the cable to ensure that the ultrasonic wave can effectively penetrate the cable insulation layer and enter the interior. The high-voltage signal generator is used to generate high-voltage signals of specific frequency and power. These signals drive the ultrasonic transmitter. The signal receiver receives the ultrasonic signals that pass through the inside of the cable and are reflected back. These signals carry information about the internal structure and potential defects of the cable. The data acquisition and processing unit includes a high-sensitivity receiving amplifier, an analog-to-digital converter and a processor. This part is responsible for receiving the weak signals received by the signal receiver to identify and locate defects inside the cable. The transmission efficiency of ultrasonic waves from the ultrasonic transmitter to the cable surface depends on the coupling effect between the two. Therefore, a coupling medium is usually applied to the surface of the cable to ensure good transmission of ultrasonic waves.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A UHV DC cable life detection device, comprising a traction mechanism (1), characterized in that: A cleaning mechanism (2) is installed on one side of the traction mechanism (1), and a cable ultrasonic detector (3) is installed on the top of the cleaning mechanism (2); The traction mechanism (1) comprises a fixed frame (101), a winding drum (103) is rotatably connected inside the fixed frame (101), and clamping members (104) are threadedly connected to the front and rear sides of the winding drum (103); The cleaning mechanism (2) comprises a cleaning head (201), a scraper ring (208) is installed inside the cleaning head (201), a collecting chamber (209) is provided in the inner cavity of the cleaning head (201) and located on the left side of the scraper ring (208), a delivery hole (210) connected to the collecting chamber (209) is provided on the surface of the cleaning head (201), a liquid extraction tube (202) is installed at the bottom of the delivery hole (210), one end of the liquid extraction tube (202) is connected to a liquid pump (203), and a liquid storage tank (206) is provided at the bottom of the liquid pump (203).

2. The UHV DC cable life detection device according to claim 1, characterized in that: A reducer (106) is fixedly connected to one side of the winding drum (103), and a motor (102) is fixedly connected to one side of the reducer (106); an output shaft of the motor (102) is connected to an input shaft of the reducer (106), and an output shaft of the reducer (106) is connected to one end of the winding drum (103).

3. The UHV DC cable life detection device according to claim 1, characterized in that: The fixing frame (101) is fixedly connected to a base (105), and the base (105) is fixedly connected to the bottom of the liquid storage tank (206).

4. The UHV DC cable life detection device according to claim 1, characterized in that: The top of the liquid pump (203) is fixedly connected to a mounting seat (204), the mounting seat (204) is installed on the top of the liquid storage tank (206), the liquid outlet end of the liquid pump (203) penetrates into the inner cavity of the liquid storage tank (206), one side of the liquid storage tank (206) is fixedly connected to a supporting bent rod (207), one end of the supporting bent rod (207) away from the liquid storage tank (206) is fixedly connected to the surface of the cleaning head (201), and the cable ultrasonic detector (3) is installed on the top of the liquid storage tank (206).

5. The UHV DC cable life detection device according to claim 1, characterized in that: A valve (205) is installed at the bottom of the front side of the liquid storage tank (206).

6. The UHV DC cable life detection device according to claim 1, characterized in that: The left side of the cleaning head (201) and the interior of the scraper ring (208) are both provided with threading holes, and the left side of the scraper ring (208) is provided with a chamfered portion.

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