CN111351968B - Tool for operation test of circuit breaker - Google Patents
Tool for operation test of circuit breaker Download PDFInfo
- Publication number
- CN111351968B CN111351968B CN201811570496.0A CN201811570496A CN111351968B CN 111351968 B CN111351968 B CN 111351968B CN 201811570496 A CN201811570496 A CN 201811570496A CN 111351968 B CN111351968 B CN 111351968B
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- Prior art keywords
- conductor
- circuit breaker
- conductive
- sealing plate
- fixed
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- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 239000004020 conductor Substances 0.000 claims abstract description 101
- 238000007789 sealing Methods 0.000 claims abstract description 44
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 10
- 238000009413 insulation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Gas-Insulated Switchgears (AREA)
- Breakers (AREA)
Abstract
The invention relates to the field of circuit breaker testing, in particular to a tool for circuit breaker operation testing, which comprises a sealing plate fixed on a wire inlet or a wire outlet of a circuit breaker shell, wherein a terminal seat used for conducting an electric signal on a wire inlet conductor or a wire outlet conductor in a circuit breaker to the outside is fixed on the sealing plate, an external connecting end used for being connected with external testing equipment and an internal connecting end used for being connected with the wire inlet conductor or the wire outlet conductor are arranged on the terminal seat, a splicing conductive structure used for being spliced and conducted with the wire inlet conductor or the wire outlet conductor is arranged on the internal connecting end, the splicing conductive structure comprises an elastic conductor used for being in elastic conductive contact with the wire inlet conductor or the wire outlet conductor, and compared with the prior art, the tool does not need to be fixed through bolts, the preparation process in the early stage of the test is simplified, and the test efficiency is improved.
Description
Technical Field
The invention relates to the field of circuit breaker testing, in particular to a tool for a circuit breaker operation test.
Background
At present, when an operation test is performed on a circuit breaker, as shown in fig. 1, a wire inlet 111 and a wire outlet 113 need to be sealed, sulfur hexafluoride insulating gas with a certain pressure needs to be filled, and operation tests such as insulation resistance measurement are performed by contacting and connecting conductors of wires of an inlet and an outlet of a circuit breaker 112 with a connector of a testing device, so that a test tool which can seal the wire inlet 111 and the wire outlet 113 and can lead out the conductors of the inlet and the outlet is needed.
Chinese utility model patent No. CN205539379U discloses a tool for mechanical property test of circuit breaker, which comprises a sealing plate fixed on a flange of a circuit breaker shell, a through hole is opened in the middle of the sealing plate, a conduction rod (i.e. a terminal seat) is installed in the through hole, one end of the conduction rod is positioned outside the circuit breaker shell and connected with a tester through a lead, the other end is positioned inside the circuit breaker shell and fixedly connected with a mounting plate and a conductor through bolts,
when the device is used, the conductor is respectively connected with the movable side end and the static side end (namely the incoming line conductor and the outgoing line conductor) of the circuit breaker through the bolts, so that data of the incoming line conductor and the outgoing line conductor are sequentially transmitted to a tester through the conductor, the mounting plate, the conducting rod and the conducting wire, and corresponding testing is completed.
But because the conductor stretches into circuit breaker casing back, the conductor passes through bolted connection with inlet wire conductor or outlet conductor, and such connected mode operation is more troublesome, leads to the installation and the efficiency of dismantling experimental frock lower, and then has influenced experimental efficiency.
Disclosure of Invention
The invention aims to provide a tool for a circuit breaker operation test, which is used for solving the problems of troublesome test operation and low test efficiency caused by the fact that a conductor is connected with an incoming line conductor or an outgoing line conductor through a bolt in the prior art.
In order to achieve the purpose, the technical scheme of the tool for the operation test of the circuit breaker is as follows:
the utility model provides a frock for circuit breaker operation test, including being used for fixing the closing plate on the inlet wire mouth or the outlet wire mouth of circuit breaker casing, be fixed with on the closing plate and be used for leading to the terminal seat of outside with the signal of telecommunication conduction on the inlet wire conductor in the circuit breaker or the conductor of being qualified for the next round of competitions, the terminal seat is last to have the interior link that is used for linking to each other with outside test equipment and is used for with inlet wire conductor or the conductor of being qualified for the next round of competitions to link, be provided with on the interior link to be used for with the conductive grafting conductive structure of conducting of inlet wire conductor or the conductor of being qualified for the next round of competitions, the conductive structure of pegging graft is including being used for the elastic conductor with the conductive contact of inlet wire conductor or the conductor of being qualified for the next round of competitions elasticity.
The beneficial effects are that: as long as the sealing plate is fixed on the wire inlet or the wire outlet of the breaker shell, the plugging conduction with the wire inlet conductor or the wire outlet conductor can be realized through the plugging conduction structure on the inner connection end, compared with the prior art, the method does not need to be fixed through bolts, the preparation process at the early stage of the test is simplified, and the test efficiency is improved; in addition, the inner connection end is in conductive contact with the incoming line conductor or the outgoing line conductor through the elastic conductor, so that the stability of the conductive connection between the plug-in conductive structure and the incoming line conductor or the outgoing line conductor is guaranteed, the stable transmission of electric signals is realized in the test process, and the test stability is guaranteed.
Furthermore, the plug-in conductive structure further comprises a conductive sleeve or a conductive head detachably fixed on the inner connecting end, and the elastic conductor is arranged on the inner hole wall of the conductive sleeve or the outer peripheral surface of the conductive head.
The beneficial effects are that: the conductive head or the conductive sleeve can realize the insertion and conduction of the insertion conductive structure and the incoming line conductor or the outgoing line conductor, and the structure of the conductive head or the conductive sleeve facilitates the arrangement of the elastic conductor.
Further, the conductive sleeve or the conductive head is fixed on the end face of the inner connecting end through a fixing bolt.
The beneficial effects are that: the conductive head or the conductive sleeve is fixed through the bolt, so that the conductive head or the conductive sleeve is more stably fixed on the inner connecting end, the stability of signal transmission is ensured, the fastening mode of bolt connection is simpler, and the processing and the assembly are convenient.
Furthermore, the inserting conductive structure is a conductive head, grooves are formed in two sides of the conductive head, and the longitudinal section of the conductive head is H-shaped; the inner connecting end extends into the groove on one side of the conductive head, and the bolt head of the fixing bolt is positioned in the groove on the other side.
The beneficial effects are that: the grooves are formed in the two sides of the conductive head, the inner connecting end extends into the groove in one side, the bolt head is located in the groove in the other side, the structure is very compact, connection is facilitated, point discharge can be avoided due to the fact that the bolt head is arranged in the groove in a built-in mode, and in addition, the weight of the conductive head is obviously reduced.
Further, the elastic conductor is a spring contact finger.
The beneficial effects are that: adopt the spring to touch the finger and make its elastic contact force with inlet wire conductor or conductor of being qualified for the next round of competitions stronger, touch the finger cover with the spring moreover and establish on the outer peripheral face of conducting head, make the spring touch the finger and inlet wire conductor or conductor of being qualified for the next round of competitions circumferential contact, the contact range is wider, has guaranteed the stable transmission of the signal of telecommunication that produces in the test procedure.
Furthermore, the terminal block comprises an inner core conductor and an insulating disc fixed outside the inner core conductor, the insulating disc is fixedly connected with the sealing plate through a locking bolt, a shielding ring covering the radial outer side of the locking bolt is arranged on the insulating disc, and the locking bolt penetrates through a through hole at the bottom of the shielding ring and a through hole in the insulating disc and then is connected to the sealing plate.
The beneficial effects are that: the insulating disc is arranged outside the inner core conductor, so that the insulating property of the peripheral side of the inner core conductor is ensured; the shielding ring is covered on the radial outer side of the locking bolt, so that the electric field of the head part of the locking bolt in operation can be uniformly acted in the test process, and the point discharge of the locking bolt is prevented; the shielding ring and the insulating disc are fixed on the sealing plate through the locking bolt, so that the fixing is firmer.
Furthermore, an insulating ring is further arranged between the shielding ring and the insulating disc, and a locking bolt through hole for a locking bolt to penetrate is formed in the insulating ring.
The beneficial effects are that: an insulating ring is arranged between the shielding ring and the insulating disk, so that the insulating property is improved.
Furthermore, an insulating plate is fixed on the side face, facing the plug-in conductive structure, of the sealing plate, and an inner core conductor through hole for the inner core conductor to pass through is formed in the insulating plate.
The beneficial effects are that: the insulating plate is fixed on the sealing plate, so that the conductive head can be isolated from the sealing plate.
Furthermore, the sealing plate is provided with an inflation inlet for inflating the circuit breaker with insulating gas, and an inflation valve is fixed at the position of the inflation inlet on the sealing plate.
The beneficial effects are that: the sealing plate is provided with the inflation inlet, and the inflation valve is fixed on the inflation inlet, so that the air tightness is ensured, and the circuit breaker can be inflated and deflated according to the test requirement.
Further, a handle for grasping is arranged on the sealing plate on the outer side of the sealing plate.
The beneficial effects are that: set up the handle on the closing plate, make things convenient for the staff to get and put experimental frock.
Drawings
Fig. 1 is a schematic structural diagram of a circuit breaker to be tested in the prior art;
fig. 2 is a schematic structural view of a tool for breaker operation tests, which is mounted at a mounting port, according to embodiment 1 of the tool for breaker operation tests of the present invention;
FIG. 3 is an enlarged view taken at I in FIG. 2;
in the drawings, 1-flange plate; 2-an inflation inlet; 3-an inflation valve; 4-sealing plate; 5-a shield ring; 6-an insulating disc; 7-an inner core conductor; 8-an insulating ring; 9-locking bolts; 10-fixing the bolt; 11-spring contact fingers; 12-a handle; 13-O type seal ring; 14-a conductive head; 15-incoming line conductor; 16-an insulating plate; 17-pan head screw; 111-wire inlet; 112-a circuit breaker; 113-outlet.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 2 and fig. 3, an embodiment 1 of the tool for breaker operation test includes a sealing plate 4 fixed to a wire inlet or a wire outlet of a breaker housing, where the sealing plate 4 fixed to the wire inlet or the wire outlet has the same structure, and here, the wire inlet is taken as an example, specifically, the sealing plate 4 is fixed to a flange plate 1 of the wire inlet, and a terminal base for conducting an electrical signal on a wire inlet conductor or a wire outlet conductor in the breaker to the outside is fixed to the sealing plate 4.
The terminal seat comprises a columnar inner core conductor 7, the upper end of the inner core conductor 7 is an outer connecting end used for being connected with external testing equipment, and the outer connecting end is provided with a threaded hole used for being connected with the testing equipment; the lower end is an inner connection end for connection to the incoming conductor 15.
The conductive head 14 is fixed on the inner connecting end, the conductive head 14 is a column body with the diameter larger than that of the inner connecting end, an upper groove and a lower groove are respectively arranged at the upper end and the lower end of the conductive head 14, the inner connecting end extends into the upper groove and is fully attached to the groove bottom of the upper groove, the conductive head 14 is fixedly connected with the inner connecting end by installing the fixing bolt 10 along the axial direction of the conductive head 14 from bottom to top, and the bolt head of the fixing bolt 10 is positioned in the lower groove.
The peripheral surface of the conductive head 14 is also provided with a ring groove, two ring grooves are arranged in the vertical direction, a spring contact finger 11 is installed in each ring groove, and the spring contact finger 11 has a radial size which is in full elastic contact with the inner wall of the incoming line conductor 15.
The terminal base further comprises an insulating disc 6 fixed on the outer side of the sealing plate 4, the insulating disc 6 is integrally formed outside the inner core conductor 7 in a pouring mode, and the inner core conductor 7 sequentially and coaxially penetrates through the insulating disc 6 and the sealing plate 4. Insulating ring 8 and shield ring 5 have been set gradually to the top of insulating disc 6, all are provided with the bolt perforation on insulating ring 8, shield ring 5, the insulating disc 6, and locking bolt 9 passes the perforation on shielding ring 5, insulating ring 8, the insulating disc 6 in proper order after, fixes insulating disc 6 on closing plate 4. The shielding ring 5 has a recess for receiving the end of the locking bolt 9, the end of the locking bolt 9 being surrounded by the inner wall of the recess.
The sealing plate 4 is provided with a horn-shaped opening through which the inner core conductor 7 passes, an insulating plate 16 is fixed on the outer side of the large end of the horn-shaped opening through a pan head screw 17, as shown in fig. 3, the insulating plate 16 is attached to the inner side surface of the sealing plate 4, an inner core conductor through hole coaxial with the horn-shaped opening is formed in the insulating plate 16, and the inner core conductor 7 axially passes through the inner core conductor through hole in the insulation.
And the outer side of the sealing plate 4 is also provided with an inflation inlet 2 for filling insulating gas into the circuit breaker, and the sealing plate 4 is fixed with an inflation valve 3 at the position of the inflation inlet 2. A handle 12 which is convenient for a worker to hold is fixed on the outer side of the sealing plate 4.
Further, an O-ring 13 is provided at a position fixed to the flange plate 1 inside the seal plate 4, and an O-ring is also provided between the insulating disk 6 and the seal plate 4.
When the tool for the circuit breaker operation test is used, the tool is lifted to the upper end of a wire inlet, the conductive head 14 is aligned with an inner hole of a wire inlet conductor 15, the tool is slowly lowered, the conductive head 14 is in plug-in fit with the wire inlet conductor 15, the spring contact finger is fully contacted with the wire inlet conductor 15, the sealing plate 4 is fixed on the flange plate 1 through the bolt, the tool is installed and fixed, in the whole installation process, only the sealing plate 4 needs to be fixed, and one end of the conductive head 14 does not need to be fixed with the wire inlet conductor 15, so that the test efficiency is improved, in the test, the outer connecting end is connected with test equipment, and the insulation resistance of the circuit breaker can be measured through a power-on test; in the dismounting process, the bolts on the flange structure only need to be dismounted, and then the tool is lifted upwards, so that the tool is separated from the flange plate 1, and the operation is very convenient.
In this embodiment, the insertion conductive structure is a conductive head, in other embodiments, the insertion conductive structure may be configured as a conductive sleeve, the lower end of the conductive sleeve has an inner hole inserted into the incoming line conductor, an inner groove may also be disposed on the inner hole wall, and a spring contact finger is embedded in the inner groove to realize conductive contact with the incoming line conductor.
In this embodiment, the measured insulation resistance is the insulation resistance, and in other embodiments, by connecting different test devices, other parameters such as the opening and closing performance can be measured.
In this embodiment, a conductive head is fixed on the inner connecting end, in other embodiments, the structure of the conductive head or the conductive sleeve can be directly processed on the inner connecting end, and the elastic conductor is arranged on the outer circumferential surface of the processed conductive head or the inner hole wall of the conductive sleeve.
In this embodiment, the conductive head is fixed to the inner connection end by the fixing bolt, in other embodiments, an external thread may be directly provided on the outer periphery of the inner connection end, and an internal thread hole adapted to the conductive head is provided on the conductive head to connect the conductive head and the inner connection end by a thread.
In this embodiment, the upper and lower ends of the conductive head are provided with grooves, and the conductive head extends into the grooves.
In this embodiment, the elastic conductor is a spring finger, and in other embodiments, a watchband finger or a petal-shaped quincuncial finger may also be used.
In this embodiment, the outside of the sealing plate is provided with a handle, and in other embodiments, the handle may not be provided, and the operator directly lifts the bottom of the sealing plate to move the tool.
In this embodiment, the sealing plate is provided with an inflation port, and an inflation valve is fixed at the position of the inflation port.
In this embodiment, the sealing plate is fixed with the insulating board on the side towards grafting conductive structure, in other embodiments, also can not set up the insulating board, can guarantee isolated effect through the mode that increases the interval between conductive head and the sealing plate this moment.
In this embodiment, an insulating ring is provided between the shield ring and the insulating disk, and in other embodiments, the insulating ring may not be provided, but this may degrade the insulating performance.
In this embodiment, the insulating disc is integrally formed outside the inner core conductor in a pouring mode, in other embodiments, the insulating disc can be manufactured separately, fixing holes are formed in the insulating disc, and the inner core conductor is fixed in the fixing holes of the insulating disc through interference fit.
In the embodiment, the insulating disc is provided with the shielding ring covering the radial outer side of the locking bolt, in other embodiments, the shielding ring is not required, and at the moment, the locking bolt may generate point discharge in the test process; or the insulating disc is provided with a groove covering the radial outer side of the locking bolt, and the locking bolt is shielded by the groove.
In this embodiment, the terminal block includes the insulating disk and the core conductor, and in other embodiments, the terminal block includes only the core conductor, and the core conductor may be directly threaded and fixed on the sealing plate.
Claims (10)
1. The utility model provides a frock for circuit breaker operation test, is fixed with on the closing plate and is used for the terminal block to outside with the signal of telecommunication conduction on the inlet wire conductor in the circuit breaker or the outlet conductor including being used for fixing the closing plate on the inlet wire of circuit breaker casing or outlet conductor, has on the terminal block to be used for the interior link end that links to each other with outside test equipment and be used for linking to each other with the inlet wire conductor or the outlet conductor, its characterized in that: the inner connecting end is provided with a plugging conductive structure for being plugged and conducted with the incoming line conductor or the outgoing line conductor, the plugging conductive structure comprises an elastic conductor for being in elastic conductive contact with the incoming line conductor or the outgoing line conductor, and the plugging conductive structure on the inner connecting end can be used for being plugged and conducted with the incoming line conductor or the outgoing line conductor as long as the sealing plate is fixed on the incoming line port or the outgoing line port of the breaker shell.
2. The tooling for the circuit breaker operation test according to claim 1, characterized in that: the plug-in conductive structure further comprises a conductive sleeve or a conductive head detachably fixed on the inner connecting end, and the elastic conductor is arranged on the inner hole wall of the conductive sleeve or the outer peripheral surface of the conductive head.
3. The tooling for the circuit breaker operation test according to claim 2, wherein: and the conductive sleeve or the conductive head is fixed on the end surface of the inner connecting end through a fixing bolt.
4. The tooling for breaker operation test according to claim 3, wherein: the plug-in conductive structure is a conductive head, grooves are formed in two ends of the conductive head, and the longitudinal section of the conductive head is H-shaped; the inner connecting end extends into the groove on one side of the conductive head, and the bolt head of the fixing bolt is positioned in the groove on the other side.
5. The tool for the circuit breaker operation test according to any one of claims 1 to 4, wherein: the elastic conductor is a spring contact finger.
6. The tooling for circuit breaker operation test according to any one of claims 1 to 4, characterized in that: the terminal seat comprises an inner core conductor and an insulating disc fixed outside the inner core conductor, the insulating disc is fixedly connected with the sealing plate through a locking bolt, a shielding ring covering the radial outer side of the locking bolt is arranged on the insulating disc, and the locking bolt penetrates through a through hole at the bottom of the shielding ring and a through hole in the insulating disc and then is connected to the sealing plate.
7. The tooling for breaker operation test according to claim 6, wherein: an insulating ring is further arranged between the shielding ring and the insulating disc, and a locking bolt through hole for a locking bolt to penetrate through is formed in the insulating ring.
8. The tooling for breaker operation test according to claim 6, wherein: an insulating plate is fixed on the side face, facing the plug-in conductive structure, of the sealing plate, and an inner core conductor through hole for the inner core conductor to penetrate through is formed in the insulating plate.
9. The tooling for circuit breaker operation test according to any one of claims 1 to 4, characterized in that: the sealing plate is provided with an inflation inlet used for filling insulating gas into the circuit breaker, and an inflation valve is fixed at the position of the inflation inlet on the sealing plate.
10. The tooling for circuit breaker operation test according to any one of claims 1 to 4, characterized in that: and a handle for grasping is arranged on the sealing plate outside the sealing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811570496.0A CN111351968B (en) | 2018-12-21 | 2018-12-21 | Tool for operation test of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811570496.0A CN111351968B (en) | 2018-12-21 | 2018-12-21 | Tool for operation test of circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111351968A CN111351968A (en) | 2020-06-30 |
| CN111351968B true CN111351968B (en) | 2022-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811570496.0A Active CN111351968B (en) | 2018-12-21 | 2018-12-21 | Tool for operation test of circuit breaker |
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| Country | Link |
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| CN (1) | CN111351968B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763861A (en) * | 2020-12-14 | 2021-05-07 | 平高集团有限公司 | Carbon ceramic linear resistor monolithic insulation test tool |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3109907A (en) * | 1960-10-14 | 1963-11-05 | Square D Co | Tripping mechanism for electric circuit breaker |
| JP2007288833A (en) * | 2006-04-12 | 2007-11-01 | Chugoku Electric Power Co Inc:The | Electrical connection appliance for test used for maintenance of apparatus, removable cover and electrical test method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201153084Y (en) * | 2008-01-31 | 2008-11-19 | 河南平高电气股份有限公司 | Electricity connecting apparatus for high-voltage switch apparatus |
| CN202119635U (en) * | 2011-05-26 | 2012-01-18 | 平高集团有限公司 | High voltage breaker mechanical characteristic testing device |
| CN204537967U (en) * | 2015-05-05 | 2015-08-05 | 加西亚电子电器有限公司 | Testing button for circuit breaker |
| CN205539379U (en) * | 2016-03-25 | 2016-08-31 | 山东泰开高压开关有限公司 | A frock for circuit breaker mechanical characteristic test |
| CN108627698A (en) * | 2018-05-07 | 2018-10-09 | 广东电网有限责任公司 | Handcart loop resistance test plug and loop resistance tester |
-
2018
- 2018-12-21 CN CN201811570496.0A patent/CN111351968B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3109907A (en) * | 1960-10-14 | 1963-11-05 | Square D Co | Tripping mechanism for electric circuit breaker |
| JP2007288833A (en) * | 2006-04-12 | 2007-11-01 | Chugoku Electric Power Co Inc:The | Electrical connection appliance for test used for maintenance of apparatus, removable cover and electrical test method |
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| Publication number | Publication date |
|---|---|
| CN111351968A (en) | 2020-06-30 |
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