CN-117589528-B - High-voltage cable buffer layer and terminal gas on-site detection device and method

CN117589528BCN 117589528 BCN117589528 BCN 117589528BCN-117589528-B

Abstract

The invention relates to the technical field of cable detection, in particular to a high-voltage cable buffer layer and terminal gas on-site detection device, which comprises a conductive wire core, wherein the outer part of the conductive wire core is wrapped with cable terminal insulation, the inside of the cable terminal insulation is provided with a stress cone, the inside of the stress cone is provided with an insulation shielding layer, the right side of the cable terminal insulation is detachably provided with a tail pipe, the inside of the tail pipe is provided with a metal sheath, the inside of the metal sheath is provided with a buffer layer, the buffer layer is wrapped outside a main insulation layer, and the right side of the tail pipe is provided with an outer sheath. According to the invention, by arranging the gas collection mechanism, collecting and component analyzing the gas of the cable terminal part and the cable buffer layer, judging the defects and the running conditions of the cable terminal and the buffer layer according to the correlation of the characteristic gas and the defects, and the device is beneficial to early warning and maintenance of the latent defects and faults of the cable low field intensity region, and has the characteristics of simple structure, convenience in operation, safety, reliability and the like.

Inventors

LI SENLIN
YANG XIAOZHI
LI QING
ZHAO CHANGWEI
WANG SHUDONG
QIAN YUCHENG
FANG ZHENBANG
CAO ZHANGPENG
GUAN SHAOQING

Assignees

国网安徽省电力有限公司电力科学研究院
国网安徽省电力有限公司合肥供电公司

Dates

Publication Date: 20260512
Application Date: 20231121

Claims (6)

1. The utility model provides a high-voltage cable buffer layer and terminal gas on-site detection device, includes conductive core (1), and the outside cover of conductive core (1) is equipped with main insulating layer (6), and the outside parcel of conductive core (1) has cable terminal insulation (2), and the outside of cable terminal insulation (2) is provided with compound sleeve (3), and the inside of cable terminal insulation (2) is provided with stress cone (4), and the right side of stress cone (4) is provided with copper mesh (5), wherein the inside of stress cone (4) is provided with insulating shielding layer (7), and the right side demountable installation of cable terminal insulation (2) has tail pipe (8), and the inside of tail pipe (8) is provided with metal sheath (9), and the inside of metal sheath (9) is provided with buffer layer (10), and the outside of main insulating layer (6) is wrapped up to buffer layer (10), and the right side of tail pipe (8) is provided with oversheath (12), is provided with lead seal (11) between tail pipe (8) and oversheath (12), and the top of stress cone (4) is provided with gas collection mechanism (13), and gas collection mechanism (13) are equipped with gas collection mechanism (14) that is used for gas collection mechanism (15) inside of gas detection independently; The gas collection mechanism (13) comprises a three-way ball valve (131) fixedly arranged outside the tail pipe (8), a first air inlet pipe (132) and a second air inlet pipe (133) are symmetrically arranged on the left side and the right side of the three-way ball valve (131), an exhaust elbow pipe (134) is communicated with the upper end of the three-way ball valve (131), a plugging ball (135) is movably arranged inside the three-way ball valve (131), a side opening of the plugging ball (135) is communicated with the first air inlet pipe (132) or the second air inlet pipe (133), a manual rotating wheel (136) for rotating the plugging ball (135) is arranged at the lower end of the three-way ball valve (131), a total air valve (137) is arranged on the exhaust elbow pipe (134), a small air pump (138) is arranged at the end part of the exhaust elbow pipe (134), and the exhaust end of the small air pump (138) is communicated with the gas analysis module (14); The first air inlet pipe (132) extends to the gap between the metal sheath (9) and the tail pipe (8), and the second air inlet pipe (133) extends to the inside of the buffer layer (10).
2. The high-voltage cable buffer layer and terminal gas on-site detection device according to claim 1, wherein the manual rotating wheel (136) is movably arranged at the lower end of the three-way ball valve (131), and the manual rotating wheel (136) is in transmission connection with the plugging ball (135).
3. The high-voltage cable buffer layer and terminal gas field detection device according to claim 1, wherein the independent power supply mechanism (15) comprises a mounting support leg (151) fixedly mounted on the outer portion of the second air inlet pipe (133), a storage battery pack (152) is detachably mounted in the mounting support leg (151), a movable ring (153) is movably mounted on the outer portion of the mounting support leg (151), a rotary impeller (154) is fixedly mounted on the outer portion of the movable ring (153), a power generation assembly is arranged in the rotary impeller (154), a spoiler (155) for increasing wind resistance is arranged at the lower end of the rotary impeller (154), and a photovoltaic assembly (156) is arranged on the upper surface of the rotary impeller (154).
4. The high voltage cable buffer and terminal gas field inspection device as set forth in claim 3, wherein said photovoltaic module (156) is a solar photovoltaic panel.
5. The high-voltage cable buffer layer and terminal gas field detection device according to claim 3, wherein a plurality of rotary impellers (154) are arranged at equal intervals, and each rotary impeller (154) is provided with a spoiler (155) and a photovoltaic assembly (156).
6. The high-voltage cable buffer layer and terminal gas field detection device according to any one of claims 1 to 5, wherein the detection method of the high-voltage cable buffer layer and terminal gas field detection device is as follows: 1. Rotating the manual rotating wheel (136) to enable the side surface of the plugging ball (135) to be communicated with the first air inlet pipe (132), and then opening the main air valve (137); 2. Then, the gas at the gap between the tail pipe (8) and the metal sheath (9) enters the inside of the exhaust elbow (134) under the action of the small air pump (138), and then the gas analysis module (14) detects and analyzes the gas components; 3. If the gas in the buffer layer (10) needs to be analyzed and detected, the manual rotating wheel (136) is reversely rotated to connect the side surface of the plugging ball (135) with the second air inlet pipe (133), then the gas in the buffer layer (10) enters the inside of the air outlet elbow pipe (134) through the second air inlet pipe (133), and then the gas analysis module (14) detects and analyzes the gas component again; 4. if the cable is powered off due to a fault, the storage battery pack (152) can independently supply power to the small air pump (138), so that normal detection operation is guaranteed, and meanwhile, the photovoltaic assembly (156) and the rotating impeller (154) can charge the storage battery pack (152).

Description

High-voltage cable buffer layer and terminal gas on-site detection device and method Technical Field The invention relates to the technical field of cable detection, in particular to a device and a method for detecting a buffer layer of a high-voltage cable and terminal gas on site. Background The high-voltage cable is often used for power supply and distribution of a power system, is influenced by factors such as manufacturing process, installation flow, operation working condition, external damage and the like, and is easy to generate latent defects in an internal low field intensity region after the cable is operated for a long time, and the latent defects comprise partial discharge and ablation of a cable buffer layer, partial discharge and ablation of a cable accessory, poor lead sealing, water seepage corrosion and the like. The Chinese patent application No. CN115078580A discloses a method for detecting the defect of a buffer layer of a high-voltage XLPE cable based on characteristic gas, which is characterized in that gas collection is carried out on a buffer layer drill hole, but only whether the buffer layer of the cable is in a defect state or not can be judged, a specific defect type can not be further judged, and the running state of a cable terminal can not be judged, and the Chinese patent application No. CN110850036A designs a device for detecting the generation of hydrogen gas by an air gap of the buffer layer of the cable under the working condition, and the change of the hydrogen content is detected to determine whether the buffer layer reacts with an aluminum sheath or not, but the method is limited to measurement in a closed cavity of a laboratory, can not be applied to field test, and meanwhile, the defect and the running state of the cable terminal can not be analyzed. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a high-voltage cable buffer layer and terminal gas on-site detection device, solves the technical problems that the detection accuracy of the cable buffer layer detection device in the prior art is low and a specific defect type cannot be judged, and has the advantages of judging the running state of a cable terminal and further judging the specific defect type. The technical scheme includes that the high-voltage cable buffer layer and the terminal gas field detection device comprise a conductive wire core, a main insulation layer is sleeved outside the conductive wire core, a cable terminal is wrapped outside the conductive wire core, a composite sleeve is arranged outside the cable terminal, a stress cone is arranged inside the cable terminal, a copper net is arranged on the right side of the stress cone, an insulation shielding layer is arranged inside the stress cone, a tail pipe is detachably arranged on the right side of the cable terminal, a metal sheath is arranged inside the tail pipe, a buffer layer is arranged inside the metal sheath, the buffer layer is wrapped outside the main insulation layer, an outer sheath is arranged on the right side of the tail pipe, a lead seal is arranged between the tail pipe and the outer sheath, a gas acquisition mechanism is arranged above the tail pipe, a gas analysis module for gas detection is arranged on the right side of the gas acquisition mechanism, an independent power supply mechanism is arranged inside the gas acquisition mechanism, and can sample and analyze gas inside the cable terminal insulation and the buffer layer when the cable is overhauled, and after the sampling is completed, the gas analysis module can detect and analyze gas components, so that the cable end is damaged. Preferably, the gas collection mechanism comprises a three-way ball valve fixedly arranged outside the tail pipe, a first air inlet pipe and a second air inlet pipe are symmetrically arranged on the left side and the right side of the three-way ball valve, an exhaust elbow pipe is communicated with the upper end of the three-way ball valve, a plugging ball is movably arranged inside the three-way ball valve, a manual rotating wheel for rotating the plugging ball is arranged at the lower end of the three-way ball valve, a total air valve is arranged on the exhaust elbow pipe, a small air pump is arranged at the end part of the exhaust elbow pipe, the exhaust end of the small air pump is communicated with the gas analysis module, and gas inside the tail pipe can enter the gas analysis module through the second air inlet pipe and the exhaust elbow pipe when the small air pump works. Preferably, the first air inlet pipe extends to the clearance between the metal sheath and the tail pipe, the second air inlet pipe extends to the inside of the buffer layer, when the three-way ball valve is communicated with the first air inlet pipe, the air at the clearance between the metal sheath and the tail pipe is sucked upwards, and when the three-way ball valve is communicated with the second air inlet pipe, the air in th