CN112600112A - Special tool for grounding and opening FRB type end screen of capacitive bushing - Google Patents
Special tool for grounding and opening FRB type end screen of capacitive bushing Download PDFInfo
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- CN112600112A CN112600112A CN202011465875.0A CN202011465875A CN112600112A CN 112600112 A CN112600112 A CN 112600112A CN 202011465875 A CN202011465875 A CN 202011465875A CN 112600112 A CN112600112 A CN 112600112A
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- grounding
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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Abstract
The invention relates to a special tool for grounding and opening an FRB type end screen of a capacitive bushing, belonging to the technical field of maintenance tools of transformers of power systems. Including the cavity handle, the head is installed to the handle front end, offer the slot that is used for the spacing contact pin of cartridge along head central line symmetry, install travel switch between head and the handle, travel switch's ejector pin part is located the head, travel switch is connected with the earth connection, earth connection one end extends to the outside and this end installation is used for the metal clip of ground connection from the trompil department of handle, install the battery in the handle, install audible-visual annunciator and switch on the handle lateral wall, the handle bottom has connect the end cap soon, the spring that is used for fixed battery is installed to the one end that the end cap is located the handle. The grounding sleeve has the advantages of simple structure, small volume, convenience in use and reliable clamping position, realizes grounding self-check after the grounding sleeve is reset, constantly ensures that the conductive rod constantly keeps grounding in the operation process, and eliminates potential safety hazards.
Description
Technical Field
The invention relates to a special tool for grounding and opening an FRB type end screen of a capacitive bushing, belonging to the technical field of maintenance tools of transformers of power systems.
Background
The 110kV and above sleeve of the transformer is mainly a capacitive sleeve, the end screen of the capacitive sleeve is reliably grounded during normal operation, otherwise, a discharge accident is caused, and the end screen needs to be opened for related tests during maintenance. The mode of opening is different because of different types of end screen grounding, and the more complicated type of end screen grounding is FRB type.
According to the FRB type end screen grounding principle, referring to the attached figure 1, a grounding conductive rod 2 is led out from the interior of a sleeve through an insulating sleeve, a grounding sleeve 3 is additionally arranged outside the conductive rod 2, and the grounding sleeve 3 connects the conductive rod 2 with the ground under the pressure of a spring 1, so that the grounding of an end screen is realized, and the end screen is used for normal operation. When the casing pipe test is carried out, the sealing cover needs to be unscrewed, the grounding sleeve 3 is pressed inwards, the connection between the grounding sleeve 3 and the ground is disconnected, the casing pipe test is carried out, and after the test is finished, the grounding sleeve 3 needs to be reset to be grounded. The existing method for opening the end screen grounding on site comprises the following steps: the grounding sleeve 3 is clamped by pliers and pressed inwards, and when the positioning hole 6 on the conducting rod is exposed, the toothpick is inserted to clamp the grounding sleeve 3. This disconnection method has the following disadvantages: the strength of the toothpick is insufficient, so that the toothpick is easy to break and the grounding is recovered; when the toothpick is pulled out after the grounding is recovered, wood dust is easy to generate and is clamped between the grounding sleeve and the conducting rod, so that the grounding sleeve cannot be completely reset, and poor grounding is caused; the grounding sleeve is clamped by pliers frequently, so that the grounding sleeve is easy to damage; in addition, after the grounding sleeve is disconnected, the conducting rod generates a suspension potential to cause electric shock to workers, and thus the personal safety of the workers is threatened.
Disclosure of Invention
The invention aims to solve the problems and provides a special tool for opening the FRB type end screen of the capacitive bushing, which has the advantages of simple structure, small volume, convenience in use, reliable clamping position, capability of realizing grounding self-check after the grounding bushing is reset and constantly ensuring that a conductive rod constantly keeps grounding in the operation process to eliminate potential safety hazards.
The invention relates to a special tool for grounding and opening an FRB type end screen of a capacitive bushing, which is characterized by comprising a hollow handle 8, wherein the front end of the handle 8 is provided with a hollow cylindrical head 9, the outer diameter of the head 9 is matched with the outer diameter of a grounding sleeve 3, the inner diameter of the electric conduction rod is larger than the outer diameter of the electric conduction rod 2, slots 10 for inserting limit pins are symmetrically formed in the center line of the head part 2, a travel switch 15 is installed between the head part 9 and the handle 8, the ejector rod 16 of the travel switch 15 is partially located in the head part 2, the travel switch 15 is connected with a grounding wire 17, one end of the grounding wire 17 extends to the outside from an opening of the handle 8, a metal clip for grounding is installed at the end of the grounding wire 17, a battery is installed in the handle 8, an audible and visual alarm 11 and a switch 12 are installed on the side wall of the handle 8, a plug 13 is screwed at the bottom of the handle 8, and a spring;
the length of the head part 9 is 8mm, the outer diameter is 10.5mm, the inner diameter is 6.5mm, and the length of the slot 10 is 5 mm;
the surface of the handle 8 is provided with anti-skid patterns, and the length of the handle 8 is 102mm, and the diameter of the handle 8 is 40 mm;
the total length of the ejector rod 16 forming the switch is 8mm, and the length of the ejector rod in the head part 9 is 3 mm;
the limiting contact pin is a stainless steel contact pin with the diameter of 3mm, and the head of the limiting contact pin is subjected to insulation treatment;
the handle 8 is made of a nylon rod.
A use method of a special tool for grounding and opening an FRB type end screen of a capacitive bushing is characterized by comprising the following steps:
1. when the switch 12 is closed, the audible and visual alarm 11 gives an audible and visual alarm, which indicates that the battery in the handle 8 is sufficient in electric quantity, the loop is normally connected, and the contact position is correct, so that the electric torch can be normally used;
2. opening the switch 12, clamping a metal clip of the grounding wire 17 to a fixing screw of the end screen grounding device, and completing grounding connection of the grounding end;
3. the head 9 is contacted with the grounding sleeve 3 of the end screen grounding device, the grounding detection loop is conducted at the moment, the audible and visual alarm 11 gives an audible and visual alarm to indicate that the end screen grounding device is reliable in grounding, the head 9 is continuously pushed to enable the head to push the grounding sleeve 3 to move, after the stroke of the travel switch 15 is reached, the grounding sleeve 3 is completely opened, the audible and visual alarm 11 loop is disconnected, the audible and visual alarm is relieved, the conductive rod 2 is suspended at the moment to threaten the safety of a human body, but the travel switch 15 acts, the grounding loop is conducted, and the conductive rod 2 is grounded;
4. inserting a limiting contact pin into the positioning hole 6 through the clamping groove, clamping the grounding sleeve 3, completing the separation of the grounding sleeve 3 and the shell, opening the end screen grounding, taking down the tool, taking down the metal clamp at the tail end of the grounding wire 17, and completing the opening work of the end screen grounding;
5. when the grounding of the end screen is recovered, a metal clip at the tail end of a grounding wire 17 is clamped to a fixing screw of a grounding device of the end screen to complete the connection of the grounding end, a head 9 is contacted with a grounding sleeve 3, a travel switch 15 acts to conduct a grounding loop, a conductive rod 2 is grounded, residual charges generated in the test process are fully released, the safety of workers is ensured, the grounding sleeve is separated from a limit contact pin, the limit contact pin is taken out to return the grounding sleeve 3, after the travel is returned to 70% of the travel, a travel switch 15 acts to return, a grounding detection loop starts to work, after the grounding sleeve 3 is reset and then grounded, the whole loop is conducted, an acousto-optic alarm 11 gives out acousto-optic alarm to perform reliable prompting of the grounding of the end screen, if no prompting is available, the grounding sleeve 3 is not completely reset, the grounding of the end screen is unreliable, the inspection treatment is required again, and the, and ending the work until the audible and visual alarm 11 gives out audible and visual alarm.
Compared with the prior art, the invention can produce the following positive effects:
the grounding device can keep grounding constantly in the operation process of opening the end screen grounding, and the tool is made of insulating materials, so that the personal safety in the operation process is ensured; the limiting contact pins are stainless steel contact pins, and the head parts of the limiting contact pins are subjected to insulation treatment, so that clamping is more reliable, and personal safety is guaranteed; the pressing mode is adopted and the operating handle is arranged, so that the operation is more labor-saving and convenient; the grounding self-checking function after the grounding sleeve is reset is provided, the grounding condition after the grounding sleeve is reset can be automatically detected, and the potential accident hazard that end screen grounding is unreliable is eliminated, so that the special tool effectively solves the potential safety hazards that clamping position is unreliable, the grounding self-checking function is not available after the grounding sleeve is reset, the conducting rod is not grounded in the operation process, and the like, the safety of workers is ensured, and the working efficiency is improved.
The grounding sleeve is displaced backwards by considering a jacking mode, the positioning hole on the conducting rod is exposed, the limiting contact pin is inserted into the clamping groove on the head part, the grounding sleeve is clamped for a test, and after the work is finished, the limiting contact pin is taken out by the same method to reset the grounding sleeve and restore the grounding.
The grounding wire is designed, so that the conductive rod can be ensured to be kept in a grounding state all the time in the process of opening the grounding sleeve, and the personal safety is ensured. The special tool is provided with a grounding self-checking device, after the grounding sleeve is reset, the grounding state of the conducting rod can be automatically detected, and a reliable grounding acousto-optic prompt signal can be reliably sent out by grounding, so that the reliable grounding of the conducting rod after the grounding sleeve is reset is ensured. And the invention is designed with a travel switch of the grounding self-checking device, and realizes the exchange of the self-checking function and the grounding function in the working process according to the position change in the pressing process. The special tool is provided with a switch which has three positions of stopping, self-checking and working for selection. The special tool has small volume and light weight, and is convenient to use and carry on site.
Drawings
Fig. 1FRB type end screen grounding structure diagram
FIG. 2 shows a special tool for grounding and opening FRB-type end screen of a capacitive bushing according to the present invention;
fig. 3 is a circuit diagram of the present invention.
In the figure: 2. A conductive rod; 3. a grounding sleeve; 6. Positioning holes; 7. an A/D converter; 8. a handle; 9. a head portion; 10. a slot; 11. an audible and visual alarm; 12. a switch; 13. a plug; 14. a spring; 15. a travel switch; 16. a top rod; 17. and a ground line.
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.
Example 1
The special tool for grounding and opening the FRB type end screen of the capacitive bushing comprises a hollow handle 8, a hollow cylindrical head 9 is arranged at the front end of the handle 8, the outer diameter of the head 9 is matched with the outer diameter of a grounding sleeve 3, the inner diameter of the electric conduction rod is larger than the outer diameter of the electric conduction rod 2, slots 10 for inserting limit pins are symmetrically formed in the center line of the head part 2, a travel switch 15 is installed between the head part 9 and the handle 8, the ejector rod 16 of the travel switch 15 is partially located in the head part 2, the travel switch 15 is connected with a grounding wire 17, one end of the grounding wire 17 extends to the outside from an opening of the handle 8, a metal clip for grounding is installed at the end of the grounding wire 17, a battery is installed in the handle 8, an audible and visual alarm 11 and a switch 12 are installed on the side wall of the handle 8, a plug 13 is screwed at the bottom of the handle 8, and a spring;
wherein, the length of the head part 9 is 8mm, the outer diameter is 10.5mm, the inner diameter is 6.5mm, and the length of the slot 10 is 5 mm; the surface of the handle 8 is provided with anti-skid patterns, the length of the handle 8 is not 102mm, and the diameter is 40 mm; the total length of the ejector rod 16 forming the switch is 8mm, and the length of the ejector rod in the head part 9 is 3 mm; the limiting contact pin is a stainless steel contact pin with the diameter of 3mm, and the head of the limiting contact pin is subjected to insulation treatment; the handle 8 is formed by processing a nylon rod and is designed to be fully insulated, so that the personal safety of workers in the working process is guaranteed, and potential safety hazards are eliminated.
The use method of the special tool for grounding and opening the FRB-type end screen of the capacitive bushing in the embodiment comprises the following steps:
1. when the switch 12 is closed, the audible and visual alarm 11 gives an audible and visual alarm, which indicates that the battery in the handle 8 is sufficient in electric quantity, the loop is normally connected, and the contact position is correct, so that the electric torch can be normally used;
2. opening the switch 12, clamping a metal clip of the grounding wire 17 to a fixing screw of the end screen grounding device, and completing grounding connection of the grounding end;
3. the head 9 is contacted with the grounding sleeve 3 of the end screen grounding device, the grounding detection loop is conducted at the moment, the audible and visual alarm 11 gives an audible and visual alarm to indicate that the end screen grounding device is reliable in grounding, the head 9 is continuously pushed to enable the head to push the grounding sleeve 3 to move, after the stroke of the travel switch 15 is reached, the grounding sleeve 3 is completely opened, the audible and visual alarm 11 loop is disconnected, the audible and visual alarm is relieved, the conductive rod 2 is suspended at the moment to threaten the safety of a human body, but the travel switch 15 acts, the grounding loop is conducted, and the conductive rod 2 is grounded;
4. inserting a limiting contact pin into the positioning hole 6 through the clamping groove, clamping the grounding sleeve 3, completing the separation of the grounding sleeve 3 and the shell, opening the end screen grounding, taking down the tool, taking down the metal clamp at the tail end of the grounding wire 17, and completing the opening work of the end screen grounding;
5. when the grounding of the end screen is recovered, a metal clip at the tail end of a grounding wire 17 is clamped to a fixing screw of a grounding device of the end screen to complete the connection of the grounding end, a head 9 is contacted with a grounding sleeve 3, a travel switch 15 acts to conduct a grounding loop, a conductive rod 2 is grounded, residual charges generated in the test process are fully released, the safety of workers is ensured, the grounding sleeve is separated from a limit contact pin, the limit contact pin is taken out to return the grounding sleeve 3, after the travel is returned to 70% of the travel, a travel switch 15 acts to return, a grounding detection loop starts to work, after the grounding sleeve 3 is reset and then grounded, the whole loop is conducted, an acousto-optic alarm 11 gives out acousto-optic alarm to perform reliable prompting of the grounding of the end screen, if no prompting is available, the grounding sleeve 3 is not completely reset, the grounding of the end screen is unreliable, the inspection treatment is required again, and the, and ending the work until the audible and visual alarm 11 gives out audible and visual alarm.
The special tool for opening the grounding of the end screen of the transformer has the advantages of small volume, convenient use, capability of greatly improving the working efficiency, labor saving in operation and reliable clamping position, realizes grounding self-check after the grounding sleeve is reset, constantly ensures that the conducting rod constantly keeps grounding in the operation process, and eliminates potential safety hazards.
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 (7)
1. The utility model provides a specialized tool is opened in capacitive sleeve FRB type end screen ground connection, a serial communication port includes the cavity handle, cavity cylindricality head is installed to the handle front end, head external diameter and ground sleeve external diameter phase-match, the internal diameter is greater than the conducting rod external diameter, offer the slot that is used for the spacing contact pin of cartridge along head central line symmetry, install travel switch between head and the handle, travel switch's ejector pin part is located the head, travel switch is connected with the earth connection, earth connection one end extends to the outside and this end installation is used for the metal clip of ground connection from the trompil department of handle, install the battery in the handle, install audible-visual annunciator and switch on the handle lateral wall, the handle bottom has connect the end cap soon, the spring that is used for fixed battery.
2. The special tool for capacitive bushing FRB-type end screen grounding opening as claimed in claim 1, wherein said head is 8mm long, 10.5mm in outer diameter, 6.5mm in inner diameter, and 5mm in slot length.
3. The special tool for capacitive bushing FRB type end screen grounding opening as claimed in claim 1, wherein the surface of said handle is provided with anti-slip patterns, the length of the handle is 102mm, and the diameter is 40 mm.
4. The special tool for capacitive bushing FRB type end screen grounding opening as claimed in claim 1, wherein the total length of the ejector pin of said travel switch is 8mm, and the length in the head 9 is 3 mm.
5. The special tool for grounding and opening FRB-type end screen of condenser bushing as claimed in claim 1, wherein the limiting pin is a stainless steel pin with a diameter of 3mm, and the end of the limiting pin is insulated.
6. The special tool for capacitive bushing FRB type end screen grounding opening as claimed in claim 1, wherein the handle is made of nylon rod.
7. An FRB-type end-screen grounding opening tool for condenser bushings according to any of claims 1-6, characterized by the following steps:
1) when the switch is closed, the audible and visual alarm gives an audible and visual alarm to indicate that the battery in the handle is sufficient in electric quantity, the loop is normally connected, and the contact position is correct, so that the handle can be normally used;
2) opening the switch, and clamping the metal clip of the grounding wire to a fixing screw of the end screen grounding device to complete grounding connection of the grounding end;
3) the head is contacted with a grounding sleeve of the end screen grounding device, the grounding detection loop is conducted at the moment, the audible and visual alarm gives an audible and visual alarm, the grounding of the end screen grounding device is reliable, the head is continuously pushed, the head pushes the grounding sleeve to move, the grounding sleeve is completely opened after the stroke of the travel switch reaches 30%, the audible and visual alarm loop is disconnected, the audible and visual alarm is relieved, the conductive rod is suspended at the moment, the personal safety is threatened, but the travel switch acts, the grounding loop is conducted, and the conductive rod is grounded;
4) inserting the limiting contact pin into the positioning hole through the clamping groove, clamping the grounding sleeve, completing the separation of the grounding sleeve and the shell, opening the end screen grounding, taking down the tool, taking down the metal clamp at the tail end of the grounding wire, and completing the opening work of the end screen grounding;
5) when the grounding of the end screen is recovered, a metal clamp at the tail end of the grounding wire is clamped to a fixing screw of a grounding device of the end screen to complete the connection of the grounding end, the head is contacted with the grounding sleeve, the travel switch acts, the grounding loop is conducted, the conducting rod is grounded, the residual charge generated in the test process is fully released, the safety of workers is ensured, the grounding sleeve is separated from the limiting contact pin, the limiting contact pin is taken out, the grounding sleeve 3 returns, when the travel switch acts for 70 percent of the travel, the travel switch acts for returning, the grounding detection loop starts to work, when the grounding sleeve is grounded after being reset, the whole loop is conducted, the audible and visual alarm sends out audible and visual alarm to carry out reliable prompting of the grounding of the end screen, if no prompting is available, the grounding sleeve is not completely reset, the grounding of the end screen is unreliable, the inspection treatment is required again, and the detection is repeated until the, and finishing the work.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011465875.0A CN112600112B (en) | 2020-12-14 | 2020-12-14 | Special tool for grounding and opening FRB type end screen of capacitive bushing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011465875.0A CN112600112B (en) | 2020-12-14 | 2020-12-14 | Special tool for grounding and opening FRB type end screen of capacitive bushing |
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| CN112600112A true CN112600112A (en) | 2021-04-02 |
| CN112600112B CN112600112B (en) | 2022-11-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917199A (en) * | 2021-10-22 | 2022-01-11 | 广东电网有限责任公司 | Safe and quick connecting device |
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| JP2000294055A (en) * | 1999-04-05 | 2000-10-20 | Toshiba Corp | Bushing |
| CN204614584U (en) * | 2015-05-15 | 2015-09-02 | 深圳供电局有限公司 | A kind of end shield earthing device for oily formula sleeve pipe |
| CN107424730A (en) * | 2017-07-31 | 2017-12-01 | 国网天津市电力公司电力科学研究院 | A kind of Transformer Bushing Tap earthing or grounding means with earthing detection function |
| CN207817116U (en) * | 2018-02-05 | 2018-09-04 | 广东电网有限责任公司惠州供电局 | A kind of thimble-type sleeve of main transformer end shield experiment auxiliary device |
| CN208835552U (en) * | 2018-09-26 | 2019-05-07 | 广东电网有限责任公司 | End shield of high-voltage bushing is grounded Elastic Contact column cap element and specific purpose tool is isolated |
| CN110398660A (en) * | 2019-08-01 | 2019-11-01 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | A kind of end shield of high-voltage bushing earthing detection and on-Line Monitor Device |
| CN210604932U (en) * | 2019-08-01 | 2020-05-22 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | High-tension bushing end screen ground connection detection device |
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2020
- 2020-12-14 CN CN202011465875.0A patent/CN112600112B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000294055A (en) * | 1999-04-05 | 2000-10-20 | Toshiba Corp | Bushing |
| CN204614584U (en) * | 2015-05-15 | 2015-09-02 | 深圳供电局有限公司 | A kind of end shield earthing device for oily formula sleeve pipe |
| CN107424730A (en) * | 2017-07-31 | 2017-12-01 | 国网天津市电力公司电力科学研究院 | A kind of Transformer Bushing Tap earthing or grounding means with earthing detection function |
| CN207817116U (en) * | 2018-02-05 | 2018-09-04 | 广东电网有限责任公司惠州供电局 | A kind of thimble-type sleeve of main transformer end shield experiment auxiliary device |
| CN208835552U (en) * | 2018-09-26 | 2019-05-07 | 广东电网有限责任公司 | End shield of high-voltage bushing is grounded Elastic Contact column cap element and specific purpose tool is isolated |
| CN110398660A (en) * | 2019-08-01 | 2019-11-01 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | A kind of end shield of high-voltage bushing earthing detection and on-Line Monitor Device |
| CN210604932U (en) * | 2019-08-01 | 2020-05-22 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | High-tension bushing end screen ground connection detection device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917199A (en) * | 2021-10-22 | 2022-01-11 | 广东电网有限责任公司 | Safe and quick connecting device |
| CN113917199B (en) * | 2021-10-22 | 2024-02-13 | 广东电网有限责任公司 | Safe and quick connecting device |
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| Publication number | Publication date |
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| CN112600112B (en) | 2022-11-22 |
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