CN112886552A - Power transmission system with leakage protection alarm module - Google Patents
Power transmission system with leakage protection alarm module Download PDFInfo
- Publication number
- CN112886552A CN112886552A CN202110124275.6A CN202110124275A CN112886552A CN 112886552 A CN112886552 A CN 112886552A CN 202110124275 A CN202110124275 A CN 202110124275A CN 112886552 A CN112886552 A CN 112886552A
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- CN
- China
- Prior art keywords
- power transmission
- rotating
- fixedly connected
- transmission system
- alarm module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/185—Electrical failure alarms
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/228—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for covered wires or cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Cable Accessories (AREA)
Abstract
The invention relates to the technical field of power transmission systems, in particular to a power transmission system with a leakage protection alarm module, which comprises a connecting seat, wherein cables are arranged on the upper inner side and the lower inner side of the connecting seat, the end parts of the left side and the right side of each cable extend into the connecting seat, a connecting frame is arranged in the middle of the inner side of the connecting seat, a stud is arranged in the middle of the inner side of the connecting frame, rotating rings are arranged on the upper side and the lower side of the connecting frame, and tooth grooves are formed in the outer sides of: the tooth grooves are formed in the outer side of the rotating ring and are in threaded connection with the stud, the stud can rotate around a cable in the rotating process, and the monitoring effect on the whole line of a power transmission system is excellent. After the detection head detects the electric leakage condition, the lifting mechanism is automatically started to jack the current-conducting plate upwards, so that the line connection is interrupted, the continuous occurrence of the electric leakage condition is prevented, and the personal safety of the line and surrounding operating personnel is protected.
Description
Technical Field
The invention relates to the technical field of power transmission systems, in particular to a power transmission system with a leakage protection alarm module.
Background
The power transmission system is realized by using a transformer to boost the electric energy generated by the generator and then connecting the electric energy to a power transmission line through control equipment such as a circuit breaker and the like. The structure form, transmission line divide into overhead transmission line and cable run.
At present, a traditional power transmission system does not have the functions of electric leakage detection and alarm processing, electric leakage occurs in the operation process of the power transmission system, the lines of the power transmission system are greatly damaged, and great hidden dangers are brought to personal safety of surrounding operators.
Disclosure of Invention
The present invention is directed to a power transmission system with an earth leakage protection alarm module to solve the problems set forth in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: an electric power transmission system with a leakage protection alarm module comprises a connecting seat, cables are arranged on the upper inner side and the lower inner side of the connecting seat, the end parts of the left side and the right side of each cable extend into the connecting seat, a connecting frame is arranged in the middle of the inner side of the connecting seat, a stud is arranged in the middle of the inner side of the connecting frame, rotating rings are arranged on the upper side and the lower side of the connecting frame, tooth grooves are formed in the outer sides of the rotating rings, a detection ring is arranged on the inner side of each rotating ring, a rotating groove is formed in the outer side of the middle of each rotating ring, a ball head is arranged in each rotating groove, a sliding block is arranged on the outer side of the end part of each ball head and arranged in a sliding way, movable grooves are formed in the upper side and the lower side of the connecting seat, a power transmission, the outside setting of pivot is provided with the mount in the inner wall about the activity groove, and the right side top of current conducting plate is provided with splint, and the below both sides of mount are provided with splint, and the bottom of mount is provided with the transmission board, and the below left side of current conducting plate is provided with elevating system, and elevating system's top is provided with insulating kicking block, and elevating system's outside top is provided with the spring.
Preferably, the end parts of the left side and the right side of the connecting frame are fixedly connected with the middle parts of the inner sides of the connecting seats on the two sides, a rotating groove is formed in the middle of the connecting frame, the stud is rotatably connected with the connecting frame in the rotating groove, and the end parts of the left side and the right side of the stud are rotatably connected with the connecting seats.
Preferably, tooth sockets are fixedly mounted at two ends of the outer side of the rotating ring, the inner side of each tooth socket is in threaded connection with the stud, and the inner wall of the inner side of the rotating ring is fixedly connected with the outer wall of the detection ring.
Preferably, the slide ways are arranged at four corners inside the connecting frame, the slide blocks are horizontally connected with the slide ways in a sliding manner, the middle parts of the outer sides of the slide blocks are fixedly connected with the end parts of the inner sides of the connecting rods, the end parts of the other sides of the connecting rods are fixedly connected with the ball heads, and the ball heads are rotatably connected with the rotating rings in the rotating grooves.
Preferably, the movable groove is arranged above the inner parts of the two sides of the connecting seat, the end part of the cable penetrates into the movable groove, and the end part of the cable is fixedly connected with the middle part of the outer side of the power transmission head.
Preferably, the right side of the power transmission head is provided with a lifting mechanism, the upper end part of the lifting mechanism is fixedly connected with the bottom of the insulating top block, the upper outer wall of the lifting mechanism is fixedly connected with the bottom of the spring, and the top of the spring is fixedly connected with the left side of the lower part of the conductive plate.
Preferably, the middle part of the current-conducting plate is fixed in the center of the movable groove through the rotating shaft, the current-conducting plate is rotatably connected with the movable groove, the left side of the current-conducting plate is in contact with the upper part of the power transmission head, and the right side of the current-conducting plate is in contact with the bottom of the fixed frame.
Preferably, the right side end of the fixing frame is fixedly connected with the right side inner wall of the movable groove, the left side and the right side of the lower portion of the fixing plate are fixedly connected with the top of the clamping plate, the power transmission plate is arranged on the inner side of the clamping plate, and the top of the power transmission plate is fixedly connected with the bottom of the fixing frame.
Compared with the prior art, the invention has the beneficial effects that:
1. the tooth grooves are formed in the outer side of the rotating ring and are in threaded connection with the stud, the stud can rotate around a cable in the rotating process, and the monitoring effect on the whole line of a power transmission system is excellent.
2. After the detection head detects the electric leakage condition, the lifting mechanism is automatically started to jack the current-conducting plate upwards, so that the line connection is interrupted, the continuous occurrence of the electric leakage condition is prevented, and the personal safety of the line and surrounding operating personnel is protected.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the connecting frame of the present invention;
FIG. 3 is a schematic view of the internal structure of the active slot of the present invention;
FIG. 4 is a schematic view of the structure at A in FIG. 1 according to the present invention.
In the figure: 1. the device comprises a connecting seat, 2, a cable, 3, a connecting frame, 4, a stud, 5, a rotating ring, 6, a tooth groove, 7, a detection ring, 8, a rotating groove, 9, a slide way, 10, a sliding block, 11, a ball head, 12, a movable groove, 13, a power transmission head, 14, a conductive plate, 15, a rotating shaft, 16, a fixing frame, 17, a clamping plate, 18, a power transmission plate, 19, a lifting mechanism, 20, an insulating top block, 21 and a spring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, the present invention provides a technical solution: an electric power transmission system with a leakage protection alarm module comprises a connecting seat 1, cables 2 are arranged on the upper inner side and the lower inner side of the connecting seat 1, the end portions of the left side and the right side of each cable 2 extend into the connecting seat 1, a connecting frame 3 is arranged in the middle of the inner side of the connecting seat 1, a stud 4 is arranged in the middle of the inner side of the connecting frame 3, rotating rings 5 are arranged on the upper side and the lower side of the connecting frame 3, tooth grooves 6 are arranged on the outer sides of the rotating rings 5, a detecting ring 7 is arranged on the inner side of each rotating ring 5, a rotating groove 8 is arranged on the outer side of the middle of each rotating ring 5, a ball head 11 is arranged in each rotating groove 8, a sliding block 10 is arranged on the outer side of the end portion of each ball head 11, the sliding block 10 is arranged in a slide way 9, movable grooves 12 are arranged on the upper side, the current conducting plate 14 sets up the center at activity groove 12, and current conducting plate 14 middle part both sides are provided with pivot 15, and the outside setting of pivot 15 is provided with mount 16 in the inner wall about activity groove 12, and the right side top of current conducting plate 14 is provided with mount 16, and the below both sides of mount 16 are provided with splint 17, and the bottom of mount 16 is provided with transmission plate 18, and the below left side of current conducting plate 14 is provided with elevating system 19, and elevating system 19's top is provided with insulating kicking block 20, and elevating system 19's outside top is provided with spring 21.
The end parts of the left side and the right side of the connecting frame 3 are fixedly connected with the middle parts of the inner sides of the connecting seats 1 on the two sides, the middle part of the connecting frame 3 is provided with a rotating groove, the stud 4 is rotatably connected with the connecting frame 3 in the rotating groove, and the end parts of the left side and the right side of the stud 4 are rotatably connected with the connecting seats 1. Tooth sockets 6 are fixedly mounted at two ends of the outer side of the rotating ring 5, the inner side of each tooth socket 6 is in threaded connection with the stud 4, and the inner wall of the inner side of the rotating ring 5 is fixedly connected with the outer wall of the detection ring 7. The slide ways 9 are arranged at four corners inside the connecting frame 3, the slide blocks 10 are horizontally connected with the slide ways 9 in a sliding manner, the middle parts of the outer sides of the slide blocks 10 are fixedly connected with the end parts of the inner sides of the connecting rods, the end parts of the other sides of the connecting rods are fixedly connected with the ball heads 11, and the ball heads 11 are rotatably connected with the rotating rings 5 in the rotating grooves 8.
The movable groove 12 is arranged above the inner parts of the two sides of the connecting seat 1, the end part of the cable 2 penetrates into the movable groove 12, and the end part of the cable 2 is fixedly connected with the middle part of the outer side of the power transmission head 13. The right side of the power transmission head 13 is provided with a lifting mechanism 19, the upper end part of the lifting mechanism 19 is fixedly connected with the bottom of an insulating top block 20, the upper outer wall of the lifting mechanism 19 is fixedly connected with the bottom of a spring 21, and the top of the spring 21 is fixedly connected with the lower left side of the conductive plate 14. The middle part of the conductive plate 14 is fixed at the center of the movable slot 12 through the rotating shaft 15, the conductive plate 14 is rotatably connected with the movable slot 12, the left side of the conductive plate 14 is contacted with the upper part of the power transmission head 13, and the right side of the conductive plate 14 is contacted with the bottom of the fixed frame 16. The right side end of the fixed frame 16 is fixedly connected with the right side inner wall of the movable groove 12, the left side and the right side of the lower portion of the fixed plate 16 are fixedly connected with the top of the clamping plate 17, the power transmission plate 18 is arranged on the inner side of the clamping plate 17, and the top of the power transmission plate 18 is fixedly connected with the bottom of the fixed frame 16.
The working principle is as follows: when the device is used, the stud 4 is driven to rotate through the rotation of the motor, the tooth grooves 6 are arranged on the outer side of the rotating ring 5, the tooth grooves 6 are in threaded connection with the stud 4, the rotating ring 5 rotates and moves on the outer side of the cable 2 along with the rotation of the stud 4, the rotating ring reciprocates on the outer side of the cable 2 in the rotating process, so that the leakage detection can be uniformly carried out on any position of the cable 2, the ball 11 rotates in the rotating groove 8 along with the rotation of the rotating ring 5, the position of the rotating ring 5 is limited through the ball 11, the ball 11 drives the sliding block 10 to slide in the sliding way 9 along with the movement of the rotating ring 5, the position of the ball 11 along with the rotating ring 5 is ensured, the ball 11 is prevented from blocking the moving space of the rotating ring 5, when the detection ring 7 detects the leakage condition of part of the cable 2, the lifting mechanism 19 is started through data transmission, utilize insulating kicking block 20 above elevating system 19 to jack up the left side of current conducting plate 14 upwards, make the left side of current conducting plate 14 break away from with transmission head 13, because clockwise upset of current conducting plate 14, the right side of current conducting plate 14 breaks away from with transmission plate 18, realize the circuit and block, overhaul the completion back to cable 2, reset elevating system 19's tip, under the pulling effect of spring 21, current conducting plate 14 resets, realizes the circuit switch-on.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides an electric power transmission system with earth leakage protection alarm module, includes connecting seat (1), its characterized in that: the cable connector is characterized in that cables (2) are arranged on the upper inner side and the lower inner side of the connecting seat (1), the end parts of the left side and the right side of each cable (2) extend into the connecting seat (1), a connecting frame (3) is arranged in the middle of the inner side of the connecting seat (1), a stud (4) is arranged in the middle of the inner side of the connecting frame (3), rotating rings (5) are arranged on the upper side and the lower side of the connecting frame (3), tooth grooves (6) are arranged on the outer sides of the rotating rings (5), a detection ring (7) is arranged on the inner side of the rotating ring (5), a rotating groove (8) is arranged on the outer side of the middle of the rotating ring (5), a ball head (11) is arranged in the rotating groove (8), a sliding block (10) is arranged on the outer side of the end part of the ball head (11), the sliding block (10) is, the cable (2) is arranged in the middle of the outer side of the power transmission head (13), a conductive plate (14) is arranged above the right side of the power transmission head (13), the conductive plate (14) is arranged at the center of the movable groove (12), rotating shafts (15) are arranged on two sides of the middle of the conductive plate (14), the outer side of each rotating shaft (15) is arranged in the left inner wall and the right inner wall of the movable groove (12), a fixed frame (16) is arranged above the right side of the conductive plate (14), clamping plates (17) are arranged on two sides below the fixed frame (16), a power transmission plate (18) is arranged at the bottom of the fixed frame (16), a lifting mechanism (19) is arranged on the left side below the conductive plate (14), an insulating ejector block (20) is arranged at the top of the lifting mechanism (.
2. An electric power transmission system with a residual-current protection alarm module according to claim 1, characterized in that: the left and right side end parts of the connecting frame (3) are fixedly connected with the middle parts of the inner sides of the connecting seats (1) on the two sides, a rotating groove is formed in the middle of the connecting frame (3), the stud (4) is rotatably connected with the connecting frame (3) in the rotating groove, and the left and right side end parts of the stud (4) are rotatably connected with the connecting seats (1).
3. An electric power transmission system with a residual-current protection alarm module according to claim 1, characterized in that: tooth sockets (6) are fixedly mounted at two ends of the outer side of the rotating ring (5), the inner side of each tooth socket (6) is in threaded connection with the stud (4), and the inner wall of the inner side of the rotating ring (5) is fixedly connected with the outer wall of the detection ring (7).
4. An electric power transmission system with a residual-current protection alarm module according to claim 1, characterized in that: the slide ways (9) are arranged at four corners inside the connecting frame (3), the sliding blocks (10) are horizontally connected with the slide ways (9) in a sliding manner, the middle parts of the outer sides of the sliding blocks (10) are fixedly connected with the end parts of the inner sides of the connecting rods, the end parts of the other sides of the connecting rods are fixedly connected with the ball heads (11), and the ball heads (11) are rotatably connected with the rotating ring (5) in the rotating groove (8).
5. An electric power transmission system with a residual-current protection alarm module according to claim 1, characterized in that: the movable groove (12) is arranged above the inner parts of the two sides of the connecting seat (1), the end part of the cable (2) penetrates into the movable groove (12), and the end part of the cable (2) is fixedly connected with the middle part of the outer side of the power transmission head (13).
6. An electric power transmission system with a residual-current protection alarm module according to claim 1, characterized in that: the right side of the power transmission head (13) is provided with a lifting mechanism (19), the upper end part of the lifting mechanism (19) is fixedly connected with the bottom of the insulating top block (20), the upper outer wall of the lifting mechanism (19) is fixedly connected with the bottom of a spring (21), and the top of the spring (21) is fixedly connected with the left side of the lower part of the conductive plate (14).
7. An electric power transmission system with a residual-current protection alarm module according to claim 1, characterized in that: the middle part of the conducting plate (14) is fixed in the center of the movable groove (12) through a rotating shaft (15), the conducting plate (14) is rotatably connected with the movable groove (12), the left side of the conducting plate (14) is in contact with the upper part of the power transmission head (13), and the right side of the conducting plate (14) is in contact with the bottom of the fixed frame (16).
8. An electric power transmission system with a residual-current protection alarm module according to claim 1, characterized in that: the right side end of the fixed frame (16) is fixedly connected with the right side inner wall of the movable groove (12), the left side and the right side of the lower portion of the fixed plate (16) are fixedly connected with the top of the clamping plate (17), the power transmission plate (18) is arranged on the inner side of the clamping plate (17), and the top of the power transmission plate (18) is fixedly connected with the bottom of the fixed frame (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110124275.6A CN112886552A (en) | 2021-01-29 | 2021-01-29 | Power transmission system with leakage protection alarm module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110124275.6A CN112886552A (en) | 2021-01-29 | 2021-01-29 | Power transmission system with leakage protection alarm module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112886552A true CN112886552A (en) | 2021-06-01 |
Family
ID=76053470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110124275.6A Withdrawn CN112886552A (en) | 2021-01-29 | 2021-01-29 | Power transmission system with leakage protection alarm module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112886552A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114966468A (en) * | 2022-05-24 | 2022-08-30 | 国网江苏省电力有限公司盐城供电分公司 | Automatic intelligent safety detection equipment for circuit maintenance |
-
2021
- 2021-01-29 CN CN202110124275.6A patent/CN112886552A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114966468A (en) * | 2022-05-24 | 2022-08-30 | 国网江苏省电力有限公司盐城供电分公司 | Automatic intelligent safety detection equipment for circuit maintenance |
| CN114966468B (en) * | 2022-05-24 | 2024-04-05 | 国网江苏省电力有限公司盐城供电分公司 | Automatic intelligent safety detection equipment for circuit maintenance |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210601 |
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| WW01 | Invention patent application withdrawn after publication |