CN109411124B - Polyvinyl chloride insulated copper wire armored power cable - Google Patents
Polyvinyl chloride insulated copper wire armored power cable Download PDFInfo
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- CN109411124B CN109411124B CN201811245965.1A CN201811245965A CN109411124B CN 109411124 B CN109411124 B CN 109411124B CN 201811245965 A CN201811245965 A CN 201811245965A CN 109411124 B CN109411124 B CN 109411124B
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- polyvinyl chloride
- end unit
- circular
- copper wire
- flame retardant
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0216—Two layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/22—Metal wires or tapes, e.g. made of steel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/32—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks
- H01B7/324—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks comprising temperature sensing means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
- H01B7/423—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation using a cooling fluid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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- Fire-Detection Mechanisms (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a polyvinyl chloride insulated copper wire armored power cable which comprises a controller, a cable body and a flame retardant device, wherein the flame retardant device comprises a first end unit, a second end unit and a plurality of middle units, flexible pipes are connected between the first end unit and the middle unit adjacent to the first end unit, between the second end unit and the middle unit adjacent to the second end unit and between two adjacent middle units, the cable body penetrates through the first end unit, the second end unit, all the middle units and all the flexible pipes, a fan is arranged at the first end unit, and an inert gas storage device is arranged at the second end unit; the cable body comprises an outer protective layer, a copper wire armor layer, a flame-retardant layer and a polyvinyl chloride insulating layer in sequence from outside to inside, wherein a plurality of wires are arranged in the polyvinyl chloride insulating layer, and each wire comprises a conductor and an inner insulating layer positioned outside the conductor. The cable body of the invention has good insulation and flame retardant properties.
Description
Technical Field
The invention relates to the field of cables, in particular to a polyvinyl chloride insulated copper wire armored power cable.
Background
The power cable is used for transmitting and distributing electric energy, and is commonly used for urban underground power grids, power station leading-out lines, power supply inside industrial and mining enterprises and power transmission lines under river-crossing seawater. In the power lines, the cable is increasing in specific gravity. According to the needs of different voltages, different types of power cables need to be used, and because the power cables transmit larger power sometimes in the using process, the requirements on the insulation performance and the novel flame retardant of the cables are higher. If combustion occurs, no significant losses will result.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to overcome the defects of the prior art and provides a polyvinyl chloride insulated copper wire armored power cable.
The technical scheme is as follows: a power cable comprises a controller, a cable body and a flame retardant device, wherein the flame retardant device comprises a first end unit, a second end unit and a plurality of middle units, flexible pipes are connected between the first end unit and the middle unit adjacent to the first end unit, between the second end unit and the middle unit adjacent to the second end unit, and between two adjacent middle units, and the cable body penetrates through the first end unit, the second end unit, all the middle units and all the flexible pipes; the middle unit comprises a circular tube with openings at two ends, a temperature sensor and a smoke sensor are installed in the circular tube, the first end unit comprises a movable ring, a first circular cylindrical part and a first circular ring plate fixed to the end part of the first circular cylindrical part, a first inner cavity is formed in the first circular ring plate and connected with a first channel and a plurality of second channels, the first channel is connected with a fan, a fixing ring is fixed to the inner side of the first circular cylindrical part, a plurality of positioning columns are fixed to one side, facing the first circular ring plate, of the fixing ring, the movable ring is provided with a plurality of positioning holes matched with the positioning columns, the number of the positioning columns is equal to that of the positioning holes, each positioning column is inserted into one positioning hole, a compression spring located between the movable ring and the fixing ring is sleeved outside each positioning column, a plurality of frustum-shaped bulges are fixed to one side, facing the first circular ring plate, the number of the frustum-shaped bulges is equal to that of the second channels, when no external force exists, each frustum-shaped bulge seals the end part of one second channel, the side wall of the first circular cylindrical part is provided with a gas outlet hole, and the outer side wall of the first circular ring plate is provided with a first cable body, and the outer side wall of the first circular ring plate are connected with the outer side wall of the first circular ring plate; the second end unit comprises a second circular cylindrical part and a second circular plate fixed to the end part of the second circular cylindrical part, a second inner cavity is formed in the second circular plate, the second inner cavity is connected with a third channel and a plurality of fourth channels, the plurality of fourth channels are all communicated with the inside of the second circular cylindrical part, the third channel is connected with a three-way valve, the three-way valve is further connected with an air outlet pipe and an air inlet pipe, the air inlet pipe is connected with an inert gas storage device, a second valve is arranged at the air inlet pipe, and the inner side of the second circular plate is fixedly connected with the outer side wall of the cable body; the first valve, the second valve, the three-way valve, the fan, all the temperature sensors and all the smoke sensors are all connected with the controller.
Further, the body comprises an outer protective layer, a copper wire armor layer, a flame-retardant layer and a polyvinyl chloride insulating layer from outside to inside in sequence, wherein a plurality of wires are arranged in the polyvinyl chloride insulating layer, and each wire comprises a conductor and an inner insulating layer positioned outside the conductor.
Further, the copper wire armor layer is a tinned copper wire armor layer.
Further, the inner insulating layer is made of polyvinyl chloride.
Further, heat-resistant particles are filled between the lead and the polyvinyl chloride insulating layer.
Further, the flame retardant layer is a low-smoke halogen-free flame retardant layer.
Furthermore, the number of the second channels is equal to the number of the fourth channels, and the number of the second channels is greater than or equal to 8.
Further, the number of the middle units of each flame retardant device is more than or equal to 4.
Further, the inner side of the first circular ring plate is fixedly connected with the outer side wall of the cable body through adhesive glue in a sealing mode; the inner side of the second circular ring plate is fixedly connected with the outer side wall of the cable body through adhesive glue in a sealing mode.
The controller controls the wireless communication unit to transmit an alarm signal when the measured value of more than one temperature sensor is greater than or equal to a set threshold value or the smoke sensor senses smoke.
Furthermore, the first valve and the second valve are electromagnetic valves.
Furthermore, the movable ring is fixed with 8 frustum-shaped protrusions, and the 8 frustum-shaped protrusions are distributed at equal intervals.
Further, the controller controls the fan, the first valve and the second valve to be closed and the third channel to be communicated with the air outlet pipe when the measured values of all the temperature sensors are smaller than the heat dissipation temperature threshold value and all the smoke sensors do not sense smoke; when all the temperature sensors are smaller than a set threshold value, all the smoke sensors do not sense smoke, and the measured value of more than one temperature sensor is larger than or equal to a heat dissipation temperature threshold value, the first valve and the second valve are closed, the fan is opened, and the third channel is communicated with the air outlet pipe; when the measured value of more than one temperature sensor is more than or equal to the set threshold value, or more than one smoke sensor senses smoke, the first valve and the second valve are opened, the fan is closed, and the third channel is communicated with the inert gas storage device.
Further, the flame retardant device comprises more than 2 flame retardant devices, and in two adjacent flame retardant devices, the first end unit of one flame retardant device is fixedly connected with the second end unit of the other flame retardant device.
Has the advantages that: the cable disclosed by the invention is good in flame retardant effect and is not easy to burn when power transmission is carried out.
Drawings
FIG. 1 is a schematic view of a fan for dissipating heat;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a schematic illustration of extinguishing a fire using an inert gas storage device;
FIG. 4 is an enlarged view of a portion of FIG. 3;
fig. 5 is a schematic view of a cable body.
Detailed Description
Reference numerals: 1 a first end unit; 2 a second end unit; 3 an intermediate unit; 4, a flexible pipe; 5 a cable body; 1.1 a first annular cylindrical portion; 1.2 a first annular plate; 1.3 a first lumen; 1.4 a second channel; 1.5 a first channel; 1.6 a fan; 1.7 a movable ring; 1.8 fixing the ring; 1.9 positioning columns; 1.10 compression spring; 1.11 a frustum-shaped bulge; 1.12 a first valve; 2.1 a second annular cylindrical portion; 2.2 a second annular plate; 2.3 a second lumen; 2.4 a fourth channel; 2.5 a third channel; 2.6 air outlet pipe; 2.7 air inlet pipe; 2.8 inert gas storage means; 2.9 three-way valve; 2.10 a second valve; 5.1 an outer protective layer; 5.2 copper wire armor layer; 5.3 insulating layer of polyvinyl chloride; 5.4 flame retardant layer; 5.5 an inner insulating layer; 5.6 conductors.
A power cable comprises a controller, a cable body and a flame retardant device, wherein the flame retardant device comprises a first end unit 1, a second end unit 2 and a plurality of middle units 3, flexible pipes are connected between the first end unit 1 and the middle unit 3 adjacent to the first end unit, between the second end unit 2 and the middle unit 3 adjacent to the second end unit, and between two adjacent middle units 3, and the cable body 5 penetrates through the first end unit 1, the second end unit 2, all the middle units 3 and all the flexible pipes; the middle unit comprises a circular tube with openings at two ends, a temperature sensor 3.1 and a smoke sensor 3.2 are arranged in the circular tube, the first end unit comprises a movable ring 1.7, a first circular cylindrical part 1.1 and a first circular plate 1.2 fixed to the end part of the first circular cylindrical part, a first inner cavity 1.3 is arranged in the first circular plate, the first inner cavity is connected with a first channel 1.5 and a plurality of second channels 1.4, the first channel is connected with a fan 1.6, a fixing ring 1.8 is fixed to the inner side of the first circular cylindrical part, a plurality of positioning columns 1.9 are fixed to one side of the fixing ring facing the first circular plate, and the movable ring is provided with a plurality of positioning holes matched with the positioning columns, the number of the positioning columns is equal to that of the positioning holes, each positioning column is inserted into one positioning hole, a compression spring 1.10 positioned between a movable ring 1.7 and a fixed ring 1.8 is sleeved outside each positioning column 1.9, one side, facing a first circular ring plate, of each movable ring is fixedly provided with a plurality of frustum-shaped protrusions 1.11, the number of the frustum-shaped protrusions is equal to that of second channels 1.4, when no external force exists, each frustum-shaped protrusion 1.11 seals the end part of one second channel, the side wall of the cylindrical part of the first circular ring is further provided with an air outlet, a first valve 1.12 is arranged at the air outlet, and the inner side of the first circular ring plate 1.2 is fixedly connected with the outer side wall of the cable body; the second end unit comprises a second circular cylindrical part 2.1 and a second circular plate 2.2 fixed to the end of the second circular cylindrical part 2.1, a second inner cavity 2.3 is formed in the second circular plate, the second inner cavity is connected with a third channel 2.5 and a plurality of fourth channels 2.4, the fourth channels 2.4 are all communicated with the inside of the second circular cylindrical part, the third channel 2.5 is connected with a three-way valve, the three-way valve is further connected with an air outlet pipe 2.6 and an air inlet pipe 2.7, the air inlet pipe 2.7 is connected with an inert gas storage device 2.8, a second valve 2.10 is arranged at the air inlet pipe 2.7, and the inner side of the second circular plate 2.2 is fixedly connected with the outer side wall of the cable body 5; the first valve 1.12, the second valve 2.10, the three-way valve, the fan, the inert gas storage device 2.8, all the temperature sensors and all the smoke sensors are connected with the controller; the cable body includes outer jacket 5.1, copper wire armor 5.2, fire-retardant layer 5.3, polyvinyl chloride insulating layer 5.4 from outside to inside in proper order, a plurality of wires have in the polyvinyl chloride insulating layer 5.4, the wire includes conductor 5.6 and is located the outer insulating layer 5.5 of conductor.
The copper wire armor layer is a tinned copper wire armor layer. The inner insulating layer is made of polyvinyl chloride. And heat-resistant particles are filled between the lead and the polyvinyl chloride insulating layer. The flame-retardant layer is a low-smoke halogen-free flame-retardant layer. The number of the second channels is equal to that of the fourth channels, and the number of the second channels is more than or equal to 8. The number of the middle units of each flame retardant device is more than or equal to 4. The inner side of the first circular plate is fixedly connected with the outer side wall of the cable body in a sealing manner through bonding glue; the inner side of the second circular ring plate is fixedly connected with the outer side wall of the cable body through adhesive glue in a sealing mode. The controller controls the wireless communication unit to transmit an alarm signal when the measured value of more than one temperature sensor is larger than or equal to a set threshold value or more than one smoke sensor senses smoke. The first valve and the second valve are electromagnetic valves.
The cable body provided by the invention is provided with the flame-retardant layer, the two insulating layers and the heat-resistant particles, and the flame-retardant insulating property of the cable body is higher. In addition, in order to further enhance the flame retardant performance, a flame retardant device is added, when power transmission is carried out under normal conditions, sometimes a cable is heated, for example, all temperature sensors of the flame retardant device are smaller than a set threshold value, all smoke sensors do not sense smoke, and when the measured value of more than one temperature sensor is larger than or equal to a heat dissipation temperature threshold value, the first valve and the second valve are closed, the fan is opened, and the third channel is communicated with the air outlet pipe; at the moment, the airflow of the fan pushes away the frustum-shaped bulge, and the surface of the blowing cable is cooled.
When the measured value of more than one temperature sensor is more than or equal to the set threshold value or more than one smoke sensor senses smoke, the first valve and the second valve are opened, the fan is closed, the third channel is communicated with the inert gas storage device, the flame retardant device is filled with inert gas, the purpose of fire extinguishment is achieved, and the first valve and the second valve can be closed after a period of time.
When the heat dissipation is not needed, the fan, the first valve and the second valve are all closed, and the third channel is communicated with the air outlet pipe.
While the invention has been shown and described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined in the following claims.
Claims (10)
1. The polyvinyl chloride insulated copper wire armored power cable is characterized by comprising a controller, a cable body and a flame retardant device, wherein the flame retardant device comprises a first end unit, a second end unit and a plurality of middle units, flexible pipes are connected between the first end unit and the middle unit adjacent to the first end unit, between the second end unit and the middle unit adjacent to the second end unit and between two adjacent middle units, and the cable body penetrates through the first end unit, the second end unit, all the middle units and all the flexible pipes; the middle unit comprises a circular tube with openings at two ends, a temperature sensor and a smoke sensor are installed in the circular tube, the first end unit comprises a movable ring, a first circular cylindrical part and a first circular ring plate fixed to the end part of the first circular cylindrical part, a first inner cavity is formed in the first circular ring plate and connected with a first channel and a plurality of second channels, the first channel is connected with a fan, a fixing ring is fixed to the inner side of the first circular cylindrical part, a plurality of positioning columns are fixed to one side, facing the first circular ring plate, of the fixing ring, the movable ring is provided with a plurality of positioning holes matched with the positioning columns, the number of the positioning columns is equal to that of the positioning holes, each positioning column is inserted into one positioning hole, a compression spring located between the movable ring and the fixing ring is sleeved outside each positioning column, a plurality of frustum-shaped bulges are fixed to one side, facing the first circular ring plate, the number of the frustum-shaped bulges is equal to that of the second channels, when no external force exists, each frustum-shaped bulge seals the end part of one second channel, the side wall of the first circular cylindrical part is provided with a gas outlet hole, and the outer side wall of the first circular ring plate is provided with a first cable body, and the outer side wall of the first circular ring plate are connected with the outer side wall of the first circular ring plate; the second end unit comprises a second circular cylindrical part and a second circular plate fixed to the end part of the second circular cylindrical part, a second inner cavity is formed in the second circular plate, the second inner cavity is connected with a third channel and a plurality of fourth channels, the plurality of fourth channels are all communicated with the inside of the second circular cylindrical part, the third channel is connected with a three-way valve, the three-way valve is further connected with an air outlet pipe and an air inlet pipe, the air inlet pipe is connected with an inert gas storage device, a second valve is arranged at the air inlet pipe, and the inner side of the second circular plate is fixedly connected with the outer side wall of the cable body; the first valve, the second valve, the three-way valve, the fan, the inert gas storage device, all the temperature sensors and all the smoke sensors are connected with the controller; the cable body comprises an outer protection layer, a copper wire armor layer, a flame-retardant layer and a polyvinyl chloride insulating layer in sequence from outside to inside, wherein a plurality of wires are arranged in the polyvinyl chloride insulating layer, and each wire comprises a conductor and an inner insulating layer positioned outside the conductor.
2. The polyvinyl chloride insulated copper wire armored power cable of claim 1, wherein the copper wire armor layer is a tinned copper wire armor layer.
3. The copper-wire armored power cable with polyvinyl chloride insulation of claim 1, wherein the inner insulation layer is made of polyvinyl chloride.
4. The copper-wire armored power cable with polyvinyl chloride insulation of claim 1, wherein the wires and the polyvinyl chloride insulation layer are filled with heat-resistant particles.
5. The polyvinyl chloride insulated copper wire armored power cable of claim 1, wherein the flame retardant layer is a low smoke zero halogen flame retardant layer.
6. The polyvinyl chloride insulated copper wire armored power cable of claim 1, wherein the number of the second channels is equal to the number of the fourth channels, and the number of the second channels is greater than or equal to 8.
7. The polyvinyl chloride insulated copper wire armored power cable of claim 1, wherein the number of the middle units of each flame retardant device is greater than or equal to 4.
8. The polyvinyl chloride insulated copper wire armored power cable of claim 1, wherein the inner side of the first circular plate and the outer side wall of the cable body are fixedly connected in a sealing manner through adhesive glue; the inner side of the second circular ring plate is fixedly connected with the outer side wall of the cable body through adhesive glue in a sealing mode.
9. The polyvinyl chloride insulated copper wire armored power cable of claim 1, further comprising a wireless communication unit, wherein the controller controls the wireless communication unit to transmit an alarm signal when the measured value of more than one temperature sensor is greater than or equal to a set threshold value or smoke is sensed by more than one smoke sensor.
10. The polyvinyl chloride insulated copper wire armored power cable according to claim 1, comprises more than 2 flame retardant devices, wherein the first end unit of one flame retardant device is fixedly connected with the second end unit of the other flame retardant device in two adjacent flame retardant devices.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811245965.1A CN109411124B (en) | 2018-10-24 | 2018-10-24 | Polyvinyl chloride insulated copper wire armored power cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811245965.1A CN109411124B (en) | 2018-10-24 | 2018-10-24 | Polyvinyl chloride insulated copper wire armored power cable |
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| CN109411124A CN109411124A (en) | 2019-03-01 |
| CN109411124B true CN109411124B (en) | 2023-04-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110045241B (en) * | 2019-04-18 | 2022-12-09 | 中国电力科学研究院有限公司 | Method and system for detecting capacitive coupling partial discharge of high-voltage cross-linked submarine cable engineering joint |
| CN110706857B (en) * | 2019-10-16 | 2020-11-20 | 扬州市红旗电缆制造有限公司 | High ageing resistance does not have steamed low fire-retardant marine frock spare special cable of cigarette |
| CN111403090B (en) * | 2020-03-11 | 2021-04-09 | 扬州曙光电缆股份有限公司 | Special cable for harsh environment of third-generation nuclear power station |
| CN112927848B (en) * | 2021-01-25 | 2022-05-17 | 郭智昊 | Copper clad aluminum conductor low-smoke halogen-free A-class flame-retardant power cable |
| CN116092730A (en) * | 2022-12-26 | 2023-05-09 | 江苏润华电缆股份有限公司 | Double-layer shielding high-temperature-resistant flame-retardant computer cable |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000096982A (en) * | 1998-09-17 | 2000-04-04 | Ougiya Koji Kk | Variable test device for underground burying pipe-line continuity inspection and composite cable for test device |
| CN108305713A (en) * | 2018-01-10 | 2018-07-20 | 宁波高新区新柯保汽车科技有限公司 | Motor cooling electric wire |
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2018
- 2018-10-24 CN CN201811245965.1A patent/CN109411124B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000096982A (en) * | 1998-09-17 | 2000-04-04 | Ougiya Koji Kk | Variable test device for underground burying pipe-line continuity inspection and composite cable for test device |
| CN108305713A (en) * | 2018-01-10 | 2018-07-20 | 宁波高新区新柯保汽车科技有限公司 | Motor cooling electric wire |
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