CN112600112B - 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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- CN112600112B CN112600112B CN202011465875.0A CN202011465875A CN112600112B CN 112600112 B CN112600112 B CN 112600112B CN 202011465875 A CN202011465875 A CN 202011465875A CN 112600112 B CN112600112 B CN 112600112B
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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.
FRB type end screen ground connection principle, refer to figure 1, for ground connection conducting rod 2 draws forth from the sleeve pipe inside through the insulating cover, conducting rod 2 plus ground sleeve 3, ground sleeve 3 is connected conducting rod 2 and ground under the pressure of spring 1, realizes the ground connection of end screen, supplies normal operating to use. When the sleeve 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 sleeve test is carried out, and the grounding sleeve 3 needs to be reset to be grounded after the sleeve test is finished. 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 being grounded, sawdust 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 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 head 9 is larger than the outer diameter of a conducting rod 2, slots 10 for inserting limiting pins are symmetrically formed along the central line of the head 2, a travel switch 15 is arranged between the head 9 and the handle 8, the ejector rod 16 of the travel switch 15 is partially positioned in the head 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 arranged at the end of the grounding wire, a battery is arranged in the handle 8, an audible and visual alarm 11 and a switch 12 are arranged on the side wall of the handle 8, a plug 13 is screwed at the bottom of the handle 8, and a spring 14 for fixing the battery is arranged at one end of the plug 13 positioned in the handle 8;
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 5mm;
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 40mm;
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 3mm;
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 clamp at the tail end of a grounding wire 17 is clamped to a fixing screw of an end screen grounding device to complete the connection of the grounding end, the head 9 is contacted with the grounding sleeve 3, the travel switch 15 acts to conduct a grounding loop, the conducting rod 2 is grounded, residual charges generated in the test process are fully released, the safety of workers is guaranteed, the grounding sleeve is separated from a limiting contact pin, the limiting contact pin is taken out, the grounding sleeve 3 returns, the travel switch 15 acts to return after returning to 70% of the travel, the grounding detection loop starts to work, after the grounding sleeve 3 is reset and then grounded, the whole loop is conducted, the audible and visual alarm 11 gives an audible and visual alarm, the end screen grounding reliable prompt is carried out, if no prompt is given, the grounding sleeve 3 is not completely reset, the end screen grounding is unreliable, the inspection process is required again, the detection is carried out repeatedly, and the work is finished after the audible and visual alarm 11 gives an 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. inserting slots; 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 and is characterized in that a hollow cylindrical head 9 is mounted 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 head 9 is larger than the outer diameter of a conducting rod 2, inserting grooves 10 for inserting limiting inserting pins are symmetrically formed along the central line of the head 2, a travel switch 15 is mounted between the head 9 and the handle 8, a top rod 16 of the travel switch 15 is partially positioned in the head 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 mounted at the end of the grounding wire 17, a battery is mounted in the handle 8, an audible and visual alarm 11 and a switch 12 are mounted on the side wall of the handle 8, a plug 13 is screwed to the bottom of the handle 8, and a spring 14 for fixing the battery is mounted at one end of the plug 13 positioned in the handle 8;
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 5mm; 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 40mm; 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 3mm; 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 clamp of a grounding wire 17 to a fixing screw of the end screen grounding device, and completing grounding connection of a 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, the head 9 is contacted with the grounding sleeve 3, the travel switch 15 acts, the grounding loop is conducted, the conductive rod 2 is grounded, residual charges generated in the test process are fully released, the safety of workers is guaranteed, the grounding sleeve is separated from the limiting contact pin, the limiting contact pin is taken out, the grounding sleeve 3 returns, the travel switch 15 acts to return after returning to 70% of the travel, the grounding detection loop starts to work, after the grounding sleeve 3 is reset and then grounded, the whole loop is conducted, the audible and visual alarm 11 gives out audible and visual alarm, the reliable prompting of the grounding of the end screen is carried out, if no prompting is carried out, the grounding sleeve 3 is not completely reset, the grounding of the end screen is unreliable, the inspection treatment is required again, and the detection is carried out repeatedly until the audible and visual alarm 11 gives out audible alarm, and the end of the work is finished.
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 (1)
1. A special tool for opening an FRB type end screen of a capacitive bushing in a grounding mode comprises a hollow handle, a hollow cylindrical head is mounted at the front end of the handle, the outer diameter of the head is matched with that of a grounding sleeve, the inner diameter of the head is larger than that of a conducting rod, inserting slots for inserting limiting inserting pins are symmetrically formed in the center line of the head, a travel switch is mounted between the head and the handle, an ejector rod part of the travel switch is located in the head, the travel switch is connected with a grounding wire, one end of the grounding wire extends to the outside from an opening of the handle, a metal clip for grounding is mounted at the end of the grounding wire, a battery is mounted in the handle, an audible and visual alarm and a switch are mounted on the side wall of the handle, a plug is screwed to the bottom of the handle, and a spring for fixing the battery is mounted at one end of the plug, which is located in the handle;
the length of the head part is 8mm, the outer diameter is 10.5mm, the inner diameter is 6.5mm, and the length of the slot is 5mm;
the surface of the handle is provided with anti-skid patterns, the length of the handle is 102mm, and the diameter of the handle is 40mm;
the total length of the ejector rod of the travel switch is 8mm, and the length of the ejector rod positioned in the head part 9 is 3mm;
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 is processed by a nylon rod;
the method is characterized by comprising 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 point is correct in position and 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 the 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, residual charges generated in the test process are fully released, the safety of workers is guaranteed, the grounding sleeve is separated from the limiting contact pin, the limiting contact pin is taken out, the grounding sleeve 3 returns, the travel switch acts to return after 70% of the travel is returned, the grounding detection loop starts to work, after the grounding sleeve is reset and grounded, the whole loop is conducted, the audible and visual alarm gives out audible and visual alarm, the grounding of the end screen is reliable, if no prompt is given, the grounding sleeve is proved to be not completely reset, the grounding of the end screen is unreliable, the inspection treatment is required again, the detection is repeated, and the work is finished until the audible and visual alarm gives out audible alarm.
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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 CN112600112A (en) | 2021-04-02 |
| CN112600112B true CN112600112B (en) | 2022-11-22 |
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| CN202011465875.0A Active 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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| CN113917199B (en) * | 2021-10-22 | 2024-02-13 | 广东电网有限责任公司 | Safe and quick connecting device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (6)
| 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 | End screen grounding device for oil type sleeve |
| 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 |
| 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 |
| 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 |
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2020
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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