CN111682450A - Universal clamp for live replacement of strain duplex insulator string and operation method - Google Patents
Universal clamp for live replacement of strain duplex insulator string and operation method Download PDFInfo
- Publication number
- CN111682450A CN111682450A CN202010650140.9A CN202010650140A CN111682450A CN 111682450 A CN111682450 A CN 111682450A CN 202010650140 A CN202010650140 A CN 202010650140A CN 111682450 A CN111682450 A CN 111682450A
- Authority
- CN
- China
- Prior art keywords
- strain
- module
- insulator string
- lead screw
- fixture
- 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.)
- Pending
Links
Images
Classifications
-
- 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
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Abstract
The invention relates to a universal fixture for replacing a strain duplex insulator string in a charged manner and an operation method thereof, wherein the universal fixture comprises a strain lead screw, an adjustable insulating pull rod, a strain front clamp and a strain rear clamp, the strain front clamp and the strain rear clamp are oppositely arranged on a cross arm side and a lead side, a plurality of connecting plate holes are formed in different positions of the strain front clamp and the strain rear clamp so as to be connected with triangular connecting plates of different models, the strain lead screw comprises a lead screw and a nut seat, a detachable hollow module is arranged in the strain rear clamp, a bearing is arranged in the nut seat, the upper end of the lead screw penetrates through the hollow module and then is provided with the nut seat with the built-in bearing, the lower end of the lead screw is connected with the upper end of the adjustable insulating pull rod, the outer side of the nut seat is connected with a metal rocker so as to drive the nut seat to move. The universal fixture and the operation method are beneficial to replacing the strain duplex insulator string in a charged manner conveniently, efficiently and safely.
Description
Technical Field
The invention belongs to the field of electric power operation tools, and particularly relates to a universal fixture for replacing a strain duplex insulator string in a charged manner and an operation method.
Background
In recent years, with the increasing of transmission lines, most of insulators used in mountain areas and thunderstorm areas of operation lines are glass and ceramic insulators, the lightning stroke rate and the self-explosion rate are relatively high, and the work of replacing the strain duplex insulator string in a charged manner is often required. However, due to the reasons that a processing and manufacturing process and construction quality are not strict, a plurality of hardware fittings with different sizes are installed on a line, so that the types of triangular connecting plates matched with the hardware fittings are different, most of the tension clamps special for live working at present have a certain application range, for example, the tension clamps are only suitable for tension strings with standard sizes such as connecting plates L-1640, L-2040 and L-3050, and part of tension duplex insulator strings cannot be replaced in a live way or are subjected to reluctant test operation by adopting the existing tension clamps, so that the adverse factors such as large physical consumption of operators, low working efficiency, high working risk and the like exist, and the live working rate and reliability of power transmission equipment are influenced.
Disclosure of Invention
The invention aims to provide a universal fixture for replacing a strain duplex insulator string in a charged manner and an operation method.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a change strain insulator pair insulator string's universal fixture with electricity, including before strain insulator lead screw, adjustable insulating pull rod and strain insulator, back card, cross arm side and wire side are located to preceding, back card subtend of strain insulator, different positions all are equipped with a plurality of and link the pore before, after the strain insulator to connect the triangle yoke plate of different models, the strain insulator lead screw includes lead screw and nut seat, the card is provided with detachable cavity module behind the strain insulator, the inside bearing that is provided with of nut seat, install built-in bearing's nut seat after the cavity module is passed to the lead screw upper end, the lead screw lower extreme is connected with adjustable insulating pull rod upper end, the nut seat outside is connected with a metal rocker to drive it along the lead screw seesaw, adjustable insulating pull rod lower extreme is connected with the card before the strain insulator.
Further, the tension front and rear clamps respectively comprise a clamp body and a built-in adjusting module, one side part of the clamp body, which is used for connecting the triangular yoke plate, is of a T-shaped structure with a middle-layer cavity, the built-in adjusting module is arranged in the middle-layer cavity and comprises a fixed module and a movable module, the fixed module is fixedly connected with the clamp body, the fixed module is provided with a first zigzag connecting part and a first through hole, the movable module is correspondingly provided with a second zigzag connecting part, the second zigzag connecting part is provided with a long screw rod, the long screw rod penetrates through the first through hole and extends out of the top of the clamp body, the movable module and the inclined plane of the triangular yoke plate inserted into the middle-layer cavity reach the optimal fit degree by adjusting the left and right positions of the long screw rod in the first through hole, and the long screw rod extending out of the top of the clamp body is fixed by a nut, so as to fix the movable module and the fixed module.
Furthermore, a plurality of connecting plate holes are correspondingly formed in the two side plates of the T-shaped structure, and connecting holes in the plate are formed in the triangular connecting plate, so that after the triangular connecting plate is inserted into the middle-layer cavity, the connecting plate holes and the connecting holes in the plate are penetrated through by fasteners, and the two side plates of the T-shaped structure and the triangular connecting plate are fixedly connected.
Furthermore, the cross section of the first through hole on the fixed module is in a long-track shape, so that when the position of the movable module is adjusted, the long screw on the sliding module can be adjusted in the left and right positions in the first through hole, and further the relative position of the movable module and the fixed module is adjusted.
Furthermore, the fixture body adopts a bent plate fixture structure.
Further, general fixture still sets insulating support bottle frame, insulating support bottle frame one end is provided with the tripod, the tripod top is threaded long screw to it is fixed through the nut after the through-hole is gone up to the card after running through the strain insulator, the tripod lower part is the cavity metal sleeve pipe, cavity metal sleeve pipe cover is located on connecting the solid metal pole on insulating support bottle frame, the tripod can be followed solid metal pole length direction and is removed about.
Furthermore, adjustable insulating pull rod back end is equipped with the locating hole of a plurality of equidistance along length direction, correspond on the card before the strain insulator and be equipped with the excellent hole of even that is connected with it, when required length was adjusted to insulating pull rod, run through corresponding locating hole and even excellent hole and fix with the nut through the screw rod, realize the length adjustment and the location of insulating pull rod.
The invention also provides an operation method for replacing the strain duplex insulator string in a live-line manner, which comprises the following steps:
1) the ground potential operator and the equipotential operator climb the tower and shift to two sides of the duplex insulator string;
2) operators on two sides select different connecting plate holes according to the types and the line distances of the triangular connecting plates, and the front and rear tension resistant clamps are fixedly connected with the triangular connecting plates on two sides of the duplex insulator string by adopting threaded fasteners;
3) adjusting built-in adjusting modules in the tension front and rear clamps to enable the tension front and rear clamps to achieve the best fit degree with the corresponding triangular yoke plate inclined planes, and fixing the tension front and rear clamps by adopting threaded fasteners;
4) operating personnel on two sides cooperate and assemble the insulating bottle support and adjust the position of a tripod of the insulating bottle support so as to ensure that the insulating bottle support is always positioned right below the insulator string to be replaced;
5) and the ground potential operator tightens the strain lead screw to loosen the insulator string, so that the strain duplex insulator string is replaced in an equipotential electrification manner.
Compared with the prior art, the invention has the following beneficial effects: before through the strain insulator, the structural design of back card, make its triangle yoke plate that can be applicable to different models, adjust the matching goodness of fit with the triangle yoke plate through built-in adjusting module simultaneously, increase fixture and the lifting surface area of triangle yoke plate, triangle yoke plate inclined plane stress point is located sliding module under the operating condition, avoid causing the damage to the fixture body, it is more firm reliable to make the fixture atress, the use of fixture no longer receives the restriction of triangle yoke plate model, solve the unable electrified change of part transmission line duplex string insulator string or need carry the problem that many sets of special strain insulator fixture try to do exercises and factor of safety are low, the convenience and the work efficiency of electrified change strain insulator duplex work have been improved. Therefore, the invention has strong practicability and wide application prospect.
Drawings
Fig. 1 is a schematic structural view of a universal fixture according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a jig body in an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a fixing module in the embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a slide module in an embodiment of the present invention.
Fig. 5 is a schematic view illustrating a connection state between the fixture body and the built-in adjusting module according to an embodiment of the present invention.
FIG. 6 is a schematic structural view of a bottle support "tripod" in an embodiment of the present invention
Fig. 7 is a schematic view of a simulated field working state of the universal fixture according to the embodiment of the present invention.
In the figure, 1-strain lead screw, 2-strain rear card, 3-strain front card, 4-adjustable insulating pull rod, 5-insulating bottle support, 6-built-in adjusting module, 7-bottle support tripod, 71-threaded long screw, 72-hollow metal sleeve, 73-solid metal rod, 8-triangular link plate and 9-duplex insulator string.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The invention provides a universal fixture for replacing a strain duplex insulator string in a live-line manner, which comprises a reinforced anti-torsion strain lead screw 1, an adjustable insulating pull rod 4, a universal strain front card 3 and a universal strain rear card 2 as shown in figures 1-7, the tension front and back clamps are oppositely arranged on the cross arm side and the lead side, a plurality of connecting plate holes are arranged at different positions on the tension front and back clamps, so as to connect the triangular yoke plates 8 with different models, the tension resistant screw rod 1 comprises a screw rod and a nut seat, the tension resistant rear clamp 2 is provided with a detachable hollow manganese steel block, a bearing is arranged in the nut seat, the upper end of the screw rod penetrates through the hollow manganese steel block and then is provided with the nut seat with the built-in bearing, the lower end of the screw rod is connected with the upper end of an adjustable insulation pull rod 4, the outer side of the nut seat is connected with a metal rocker, so as to drive the adjustable insulating pull rod to move back and forth along the screw rod, and the lower end of the adjustable insulating pull rod 4 is connected with the tension front clamp 3.
In this embodiment, the side is connected with the triangle yoke plate to preceding, back card of strain is diplopore structure, sets up two link plate holes on it promptly, and two hole interval 100mm are respectively for the line distance to be 400mm and 500 mm's triangle yoke plate. The front card is provided with a small ring capable of being operated remotely and a small hole for mounting a mirror, so that the operation in a ground potential mode can be realized, and the operation can be carried out in an equipotential mode. The strain lead screw adopts a single-pass design, so that the strain lead screw can be freely retracted and released, and the stroke margin and strength meet the requirements of the operation of replacing the strain duplex insulator string in an electrified way.
The front and rear tension-resistant cards respectively comprise a clamp body and a built-in adjusting module 6, and fig. 5 shows the connection state of the clamp body and the built-in adjusting module. As shown in figure 2, the clamp body adopts a bent plate clamp structure design, the traditional large knife clamp design is cancelled, and the deformation and the separation of the large knife front clamp in the assembling and stress process are effectively avoided. The fixture body is used for connecting one side part of the triangular yoke plate and is of a T-shaped structure with a middle-layer cavity, the built-in adjusting module 6 is arranged in the middle-layer cavity, the built-in adjusting module 6 comprises a fixed module and a movable module, the fixed module is fixedly connected with the fixture body, as shown in figure 3, the fixed module is provided with a first zigzag connecting part and a first through hole, as shown in figure 4, the movable module is correspondingly provided with a second zigzag connecting part, the second zigzag connecting part is provided with a long screw rod, the long screw rod penetrates through the first through hole and extends out of the top of the fixture body, the movable module and the triangular yoke plate inserted into the middle-layer cavity reach the optimal matching degree by adjusting the left and right positions of the long screw rod in the first through hole, and then the long screw rod extending out of the top of the fixture body is fixed through a butterfly nut so as to fix the movable module, at the moment, the stress point of the inclined plane of the triangular connecting plate is positioned on the sliding module in the working state, so that the clamp body is prevented from being damaged.
The connecting plate is characterized in that a plurality of connecting plate holes are correspondingly formed in the two side plates of the T-shaped structure, and connecting holes are formed in the triangular connecting plate, so that after the triangular connecting plate is inserted into the middle-layer cavity, the connecting plate holes and the connecting holes in the connecting plate are penetrated through by fasteners, and the two side plates of the T-shaped structure and the triangular connecting plate are fixedly connected. The cross section of the first through hole in the fixed module is in a long-track shape, so that when the position of the movable module is adjusted, the long screw on the sliding module can be adjusted in the left and right positions in the first through hole, the relative position of the movable module and the fixed module is adjusted, and the movable module and the fixed module are fixed to the top end of the fixture body through the nut.
In this embodiment, the tension front and rear clamps are made of high-strength TC4 titanium alloy material to meet the strength requirement of the clamps when being stressed. The adjustable range of the built-in adjusting module reaches 0-7 cm.
General fixture still sets insulating support bottle frame, insulating support bottle frame one end is provided with "tripod" 7, the top of "tripod" 7 is threaded long screw 71 to it is fixed through the nut after passing through the strain insulator back card through-hole, "tripod" lower part is cavity metal sleeve 72, cavity metal sleeve 72 cover is located on the solid metal pole 73 of connection on insulating support bottle frame, "tripod" can be followed solid metal pole length direction and removed. The bottle supporting frame is designed by adopting a special-shaped insulating tube, adopts a large-disc-diameter structure, plays a role in horizontally bearing the self weight of an insulator string to be replaced in any model, is small in flexibility of the middle part of the bottle supporting frame, and reduces the tightening stroke of the screw rod to the maximum extent. As shown in fig. 6, the tripod connected with the bottle support frame and the rear card can move left and right along the length direction of the solid metal rod, so that the bottle support frame is always positioned under the insulator string to be replaced in the operation process, the stress of the bottle support frame is effectively ensured to be in a balanced state, and the danger that the insulator string falls due to the fact that the bottle support frame turns over after the insulator string is loosened is avoided.
Adjustable insulating pull rod 4 back end is equipped with the locating hole of a plurality of equidistance along length direction, correspond before the strain insulator and be equipped with the even stick hole rather than being connected, when required length was adjusted to insulating pull rod, run through corresponding locating hole and even stick hole and fix with the nut through the screw rod, realize the length adjustment and the location of insulating pull rod.
In this embodiment, the adjustable insulating pull rod is designed with multiple holes, and is made of a moisture-proof filling pipe material, so that the adjustable insulating pull rod has the characteristics of high mechanical strength (# 32, 20 tons), tensile strength, torsion resistance, adjustable length and the like, and the insulating property is sufficient to meet the requirement of hot-line work.
The invention also provides an operation method for replacing the strain duplex insulator string in a live-line manner, which comprises the following steps:
1) the ground potential operator and the equipotential operator climb the tower and shift to two sides of the duplex insulator string 9;
2) operators on two sides select different connecting plate holes according to the type and the line distance of the triangular connecting plate, and the strain front card 3 and the strain rear card 2 are fixedly connected with the triangular connecting plates 8 on two sides of the duplex insulator string 9 by screw nuts;
3) adjusting the built-in adjusting modules 6 in the tension front and rear clamps to enable the built-in adjusting modules and the corresponding inclined planes of the triangular yoke plates 8 to achieve the best fit degree, and fixing the modules through butterfly nuts;
4) operating personnel on two sides cooperate and assemble the insulating bottle support 5, and adjust the position of a tripod 7 of the insulating bottle support to ensure that the insulating bottle support is always positioned right below the insulator string to be replaced;
5) and the ground potential operator tightens the strain lead screw 1 to loosen the insulator string, so that the strain duplex insulator string is replaced in an equipotential electrification manner.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (8)
1. The utility model provides a change strain insulator pair insulator string's universal fixture with electricity, its characterized in that, including before strain insulator lead screw, adjustable insulating pull rod and strain insulator, back card, cross arm side and wire side are located to preceding, back card subtend of strain insulator, different positions all are equipped with a plurality of link hole before the strain insulator on the card to connect the triangle yoke plate of different models, the strain insulator lead screw includes lead screw and nut seat, the strain insulator back card is provided with detachable cavity module, the inside bearing that is provided with of nut seat, install built-in bearing's nut seat after the cavity module is passed to the lead screw upper end, the lead screw lower extreme is connected with adjustable insulating pull rod upper end, the nut seat outside is connected with a metal rocker to drive its along lead screw seesaw, adjustable insulating pull rod lower extreme is connected with the preceding card of strain insulator.
2. The universal fixture for charged replacement of a strain duplex insulator string as claimed in claim 1, wherein the front and rear strain clamps respectively comprise a fixture body and an internal adjusting module, the fixture body is used for connecting one side portion of the triangular yoke plate and has a T-shaped structure with a middle cavity, the internal adjusting module is arranged in the middle cavity, the internal adjusting module comprises a fixed module and a movable module, the fixed module is fixedly connected with the fixture body, the fixed module is provided with a first zigzag connecting portion and a first through hole, the movable module is correspondingly provided with a second zigzag connecting portion, the second zigzag connecting portion is provided with a long screw, the long screw passes through the first through hole and extends out of the top of the fixture body, and the movable module and the inclined surface of the triangular yoke plate inserted into the middle cavity achieve the best fit degree by adjusting the left and right positions of the long screw in the first through hole, and fixing the long screw rod extending out of the top of the fixture body through a nut so as to fix the movable module and the fixed module.
3. The universal fixture for replacing the strain duplex insulator string in an electrified manner as claimed in claim 2, wherein a plurality of connecting plate holes are correspondingly formed in the two side plates of the T-shaped structure, and the triangular connecting plate is provided with connecting holes so that the two side plates of the T-shaped structure and the triangular connecting plate can be fixedly connected through the connecting plate holes and the connecting holes in the connecting plate by fasteners after the triangular connecting plate is inserted into the middle-layer cavity.
4. The universal fixture for replacing the strain duplex insulator string in an electrified manner according to claim 2, wherein the cross section of the first through hole on the fixed module is in a long-runway shape, so that when the position of the movable module is adjusted, the long screw rod on the sliding module can be adjusted in the left and right positions in the first through hole, and further the relative position of the movable module and the fixed module is adjusted.
5. The universal fixture for replacing the strain duplex insulator string in an electrified manner according to claim 2, wherein the fixture body adopts a bent plate fixture structure.
6. The universal fixture for replacing the strain duplex insulator string in an electrified manner according to claim 1, wherein an insulating bottle holder is further arranged on the universal fixture, a tripod is arranged at one end of the insulating bottle holder, a threaded long screw is arranged at the top end of the tripod so as to penetrate through a through hole in the strain post-clamping and then be fixed through a nut, a hollow metal sleeve is arranged at the lower portion of the tripod, the hollow metal sleeve is sleeved on a solid metal rod connected to the insulating bottle holder, and the tripod can move left and right along the length direction of the solid metal rod.
7. The universal fixture for replacing the strain duplex insulator string in an electrified manner according to claim 1, wherein a plurality of positioning holes are formed in the rear section of the adjustable insulating pull rod at equal intervals along the length direction, the strain front fixture is correspondingly provided with connecting rod holes connected with the adjustable insulating pull rod, and when the insulating pull rod is adjusted to a required length, the screw penetrates through the corresponding positioning holes and the corresponding connecting rod holes and is fixed by a nut, so that the length adjustment and the positioning of the insulating pull rod are realized.
8. The working method for replacing the strain duplex insulator string in a charged manner is characterized by comprising the following steps of:
1) the ground potential operator and the equipotential operator climb the tower and shift to two sides of the duplex insulator string;
2) operators on two sides select different connecting plate holes according to the types and the line distances of the triangular connecting plates, and the front and rear tension resistant clamps are fixedly connected with the triangular connecting plates on two sides of the duplex insulator string by adopting threaded fasteners;
3) adjusting built-in adjusting modules in the tension front and rear clamps to enable the tension front and rear clamps to achieve the best fit degree with the corresponding triangular yoke plate inclined planes, and fixing the tension front and rear clamps by adopting threaded fasteners;
4) operating personnel on two sides cooperate and assemble the insulating bottle support and adjust the position of a tripod of the insulating bottle support so as to ensure that the insulating bottle support is always positioned right below the insulator string to be replaced;
5) and the ground potential operator tightens the strain lead screw to loosen the insulator string, so that the strain duplex insulator string is replaced in an equipotential electrification manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010650140.9A CN111682450A (en) | 2020-07-08 | 2020-07-08 | Universal clamp for live replacement of strain duplex insulator string and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010650140.9A CN111682450A (en) | 2020-07-08 | 2020-07-08 | Universal clamp for live replacement of strain duplex insulator string and operation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111682450A true CN111682450A (en) | 2020-09-18 |
Family
ID=72457350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010650140.9A Pending CN111682450A (en) | 2020-07-08 | 2020-07-08 | Universal clamp for live replacement of strain duplex insulator string and operation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111682450A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112202106A (en) * | 2020-10-31 | 2021-01-08 | 国网河南省电力公司平顶山供电公司 | Tool and operation method for replacing double-bundle conductor strain insulator string at earth potential |
-
2020
- 2020-07-08 CN CN202010650140.9A patent/CN111682450A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112202106A (en) * | 2020-10-31 | 2021-01-08 | 国网河南省电力公司平顶山供电公司 | Tool and operation method for replacing double-bundle conductor strain insulator string at earth potential |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107706871B (en) | Overhead distribution line | |
| CN202121254U (en) | Cross arm lateral side clamp of double-fission double-suspension insulator string for erecting tower | |
| US8173904B1 (en) | Post insulator blade adaptor | |
| CA2823132C (en) | Maintenance tool used for direct current transmission line | |
| CN105914646A (en) | Live-line working method for replacing 35kV strain insulator strings | |
| CN111682450A (en) | Universal clamp for live replacement of strain duplex insulator string and operation method | |
| CN103441353B (en) | A kind of 110 kilovolts of overhead transmission line anchor support common ground lines | |
| CN107508192B (en) | Adjustable wire overhauls coaster | |
| CN104963543A (en) | Cross arm for electric power circuit | |
| CN208142787U (en) | Aluminium alloy aerial insulated cable fixes device | |
| CN203747299U (en) | Mountable and dismountable dual-purpose airfoil-profile clamping device | |
| CN212435211U (en) | Universal fixture for live replacement of strain duplex insulator string | |
| CN207183929U (en) | A kind of 110kV power line tensions list insulator string more changing device | |
| CA2823137C (en) | Maintenance tool used for double insulator strings of direct current transmission line | |
| CN204144784U (en) | A kind of adjustable strain insulator wire load replacing insulator protective device | |
| KR101806526B1 (en) | Insulator for fixing aerial power line to electric pole | |
| CN210053105U (en) | Simple tool for adjusting lead sag | |
| CN103762519B (en) | A kind of dual-purpose wing type clamp apparatus of self-mountable & dismountuble | |
| CN208656288U (en) | The replacement tool of ground electrode circuit insulator and fitting | |
| CN108123410B (en) | Ground wire safe backup suspension hardware string | |
| CN107302204B (en) | Upper combined electricity taking device | |
| CN205724648U (en) | A kind of charged for replacement 35kV strain insulator string specific purpose tool | |
| CN218997586U (en) | Adjustable cable installing support for polarimeter | |
| CN110492384A (en) | A kind of disengaging extra-high voltage strain rod tower insulator chain supplementary insulation bar | |
| CN205195138U (en) | A sharp shoulder pole card for changing sharp insulator chain that singly goes here and there |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |