CN109872914B - Railway traction becomes high pressure and connects switch - Google Patents
Railway traction becomes high pressure and connects switch Download PDFInfo
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- CN109872914B CN109872914B CN201910191356.0A CN201910191356A CN109872914B CN 109872914 B CN109872914 B CN 109872914B CN 201910191356 A CN201910191356 A CN 201910191356A CN 109872914 B CN109872914 B CN 109872914B
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Abstract
The invention relates to the field of high-voltage electrical equipment, in particular to a railway traction variable-height compression-joint ground switch. The grounding switch pole comprises a grounding switch pole, a mounting plate, an operating mechanism, a grounding copper part, a grounding knife, a conductive copper part, a semi-conductive shielding layer, a semi-conductive buffer layer and an insulating layer. The grounding switch pole and the operating mechanism are positioned on two sides of the mounting plate, and the operating mechanism is matched with screw teeth in the grounding knife through a screw rod to drive the grounding knife to move linearly. And a semi-conductive buffer layer is arranged between the electric conductor and the solid insulating material sealing part. And the non-connection part on the surface of the solid insulating material is solidified with the semi-conductive shielding layer and is connected with the shell. The conductor joints are all provided with uniform pieces to eliminate the phenomenon of partial point discharge. The invention reduces the volume of the switch; the partial discharge capacity of the product is reduced, the service life of the product is prolonged, and the reliability is improved.
Description
Technical Field
The invention relates to the field of high-voltage electrical equipment, in particular to a railway traction variable-height compression-joint ground switch.
Background
With the continuous development of Chinese economy, important means of railway transportation in Chinese transportation play more and more positive roles, the construction of Chinese railways enters the golden period, and high-speed rails and motor cars become main transportation tools for trips. The safety and reliability of traction substations for providing electric power for electrified locomotives are also more and more important, and with the arrival of the high-speed rail era, the traction substations face increasingly vigorous market demands. The railway traction power supply line supplies power in sections, and when a locomotive passes through the railway traction power supply line, the current of the railway traction power supply line is large (for example, the current required by a renaming motor car reaches 1000A); when the locomotive passes through, the current of the section of the line is rapidly reduced and even reduced to zero. Therefore, the impact on the railway traction switch equipment is great, and the service life of the switch equipment is seriously influenced. Conventional railway traction switchgears are based on gas insulation, as disclosed in publication CN201490613U for a two-phase common-box railway switchgear. The existing gas insulated switch has the disadvantages of large volume and low safety (the risks of gas leakage, deflagration and the like). The solid insulation switch device has the advantages of small volume, no arcing and the like, but has difficulty in temperature rise control, needs to solve the problem of thermal stress generated by high-temperature and low-temperature alternation, and prevents insulation failure caused by cracking of an insulation layer.
Disclosure of Invention
The invention aims to provide a railway traction high-voltage grounding switch which is small in size and high in safety.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a railway traction becomes high pressure and connects ground switch, includes ground switch utmost point post, mounting panel, operating mechanism, ground connection copper spare, earthing knife, electrically conductive copper spare, semi-conductive shielding layer, semi-conductive buffer layer, insulating layer. The grounding switch pole and the operating mechanism are positioned on two sides of the mounting plate, and the operating mechanism is matched with screw teeth in the grounding knife through a screw rod to drive the grounding knife to move linearly. The grounding knife penetrates through the grounding copper piece, the guiding block is arranged on the grounding copper piece, and the guiding block stretches into the guiding groove to prevent the grounding knife from rotating along with the screw rod. The grounding copper piece is conducted with the grounding knife through the grounding spring contact finger. A lip-shaped sealing element is arranged in the through hole of the mounting plate to wrap the grounding knife, so that sealing is realized. The flange face of the bottom of the grounding switch pole is provided with a groove, and a sealing ring is arranged in the groove and sealed with the mounting plate. And a semi-conductive buffer layer is arranged between the conductive copper piece and the solid insulating material sealing part. And the non-connection part on the surface of the solid insulating material is solidified with the semi-conductive shielding layer and is connected with the mounting plate.
The earthing switch pole comprises a switch connecting end, an earthing knife chamber, a pull rod chamber, an earthing copper part, a conductive copper part, a semiconductive buffer layer, a semiconductive shielding layer, an inner cone bottom uniform ring and an earthing knife uniform pressing part. The switch connecting end is divided into an upper part and a lower part, a copper conductive piece is arranged in the middle, a counter bore is arranged in the middle of the copper conductive piece, a groove is formed in the inner wall of the counter bore, a grounding knife spring contact finger is arranged in the counter bore, the counter bore is matched with the grounding knife head, and the grounding knife spring contact finger is conducted. And 2 grooves are formed in the conductive copper piece in the connecting port and used for placing the spring contact fingers to be connected with the circuit breaker. The switch connecting end is an inner cone-shaped interface, an inner cone bottom equalizing ring is arranged in the inner cone bottom insulating layer, the electric field of the junction of the copper conductive piece and the inner cone bottom can be improved by the inner cone bottom equalizing ring, and the phenomenon of electric field concentration is avoided. A ground cutter equalizing part is arranged at the connecting part of the conductive copper part counter bore and the ground cutter chamber, so that the electric field at the connecting part of the ground cutter chamber and the conductive copper part is improved, and the phenomenon of electric field concentration is avoided. The inner wall of the ground cutter chamber is provided with an inwards concave skirt edge, so that the creepage distance is increased, and the insulating capability is improved. Semi-conductive buffer layers are arranged between the upper inner cone bottom equalizing rings and the lower inner cone bottom equalizing rings of the conductive copper part and on the surface of the connecting part of the ground cutter equalizing ring, so that the stress caused by the temperature rise of the conductive copper part can be reduced. The grounding terminal is arranged at the lower part of the grounding copper piece and penetrates through the insulating layer. The grounding terminal is provided with 2 grooves in the insulating layer, and an O-shaped ring is arranged in the grooves and fixed with the insulating layer. Lip type sealing member, sealing washer, O type circle realize the sealed of pull rod room jointly, prevent that moisture and dust from getting into pull rod room and ground sword room, influencing insulating level.
The operating mechanism adopts a gear set to drive the screw rod to move. The operating mechanism is provided with a locking device and an unlocking device. When the grounding tool bit moves into the counter bore in the middle of the conductive copper part and is contacted with the spring contact finger of the grounding tool, the locking device is started. When the grounding cutter head moves to the position of the grounding copper piece, the unlocking device is started, and mechanical and electrical interlocking is released.
The semi-conductive buffer layer is mainly used for eliminating factors influencing partial discharge, such as tips, burrs and the like on the surface of the electric conductor; meanwhile, when the conductor generates heat, the stress between the solid insulating material and the conductor caused by expansion with heat and contraction with cold is buffered, and gaps and cracks of the solid insulating material are avoided. The resistance value of the semi-conductive buffer layer is between 3000 ohm and 6000 ohm. The thickness of the semi-conductive buffer layer is between 0.5 and 2 millimeters. The main components of the semiconductive buffer layer are carbon powder and silicon rubber. The semi-conductive buffer layer is uniformly mixed by adopting silicon rubber liquid and carbon powder, then is sprayed on the solid sealing part of the electric conductor, is solidified, and then is subjected to sand blasting, polishing and cleaning on the outer surface of the solidified buffer layer, and finally is subjected to solid sealing by being filled into an injection mold.
The cold plate for the shell body, the mechanism mounting plate are 45# steel, and the insulating part is made of stainless steel for preventing vortex.
The invention has the beneficial effects that: 1. the solid insulating material is adopted, so that the volume of the switch is reduced; 2. the voltage equalizing piece and the semi-conductive shielding grounding layer are adopted, so that the local discharge amount of the product is reduced; a semi-conductive buffer layer is adopted between the electric conductor and the sealing material, so that the insulation life of the product is prolonged; 3. the lip-shaped sealing element, the sealing ring and the O-shaped ring are used in a combined mode, so that the dust and water vapor prevention capability of the pull rod chamber is improved, and the reliability of a product is improved; 4. the interlocking device improves the operation safety of the product.
Drawings
FIG. 1 is a schematic cross-sectional view of a railway traction high-voltage grounding switch;
fig. 2 is a schematic diagram of a partial amplification of a grounding switch pole.
The reference numbers illustrate: 1. The grounding switch pole comprises a grounding switch pole 1.1, a grounding knife chamber 1.2, a skirt edge 2, a mounting plate 2.1, a lip-shaped sealing element 2.2, a sealing ring 3, an operating mechanism 3.1, a screw rod 4, a grounding copper part 4.1, a grounding terminal 4.2, an O-shaped ring 4.3, a guide block 4.4, a grounding spring contact finger 5, a pull rod chamber 6, a grounding knife 6.1, a screw thread 6.2, a guide groove 7, a conductive copper part 7.1, an inner cone bottom uniform ring 7.2, a grounding knife uniform pressing part 7.3, a groove 7.4, a grounding knife spring contact finger 8, a semi-conductive shielding layer 9, a semi-conductive buffer layer 10 and an insulating layer.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings.
Example 1
As shown in fig. 1 and 2, the railway traction high-voltage grounding switch comprises a grounding switch pole 1, a mounting plate 2, an operating mechanism 3, a grounding copper part 4, a grounding knife 6, a conductive copper part 7, a semi-conductive shielding layer 8, a semi-conductive buffer layer 9 and an insulating layer 10. The grounding switch pole 1 and the operating mechanism 3 are positioned on two sides of the mounting plate 2, and the operating mechanism 3 is matched with a screw thread 6.1 in the grounding knife 6 through a screw rod 3.1 to drive the grounding knife to move linearly. The grounding knife 6 penetrates through the grounding copper piece 4, the guiding block 4.3 is arranged on the grounding copper piece 4, and the guiding block 4.3 extends into the guiding groove 6.2 to prevent the grounding knife from rotating along with the screw rod. The grounding copper piece 4 is conducted with the grounding knife 6 through the grounding spring contact finger 4.4. A lip-shaped sealing element 2.1 is arranged in the through hole of the mounting plate to wrap the grounding knife, so that sealing is realized. The flange face of the bottom of the grounding switch pole is provided with a groove, and a sealing ring 2.2 is arranged in the groove and sealed with the mounting plate. And a semi-conductive buffer layer 9 is arranged between the conductive copper piece 7 and the solid insulating material sealing part. The non-connection part on the surface of the solid insulating material is solidified with the semi-conductive shielding layer 8 and is connected with the mounting plate.
The grounding switch pole 1 comprises a switch connecting end, a grounding knife chamber 1.1, a pull rod chamber 5, a grounding copper part 4, a conductive copper part 7, a semi-conductive buffer layer 9, a semi-conductive shielding layer 8, an inner cone bottom uniform ring 7.1 and a grounding knife uniform pressing part 7.2. The switch connecting end is divided into an upper part and a lower part, a copper conductive piece 7 is arranged in the middle, a counter bore is arranged in the middle of the copper conductive piece 7, a groove 7.3 is formed in the inner wall of the counter bore, a grounding knife spring contact finger 7.4 is arranged in the counter bore, the counter bore is matched with a grounding knife head, and the grounding knife spring contact finger 7.4 is used for conducting. The electrically conductive copper spare in the connecting port is gone up to open has 2 recesses 7.3 for place the spring and touch the finger and be connected with the circuit breaker. The switch connecting end is interior toper interface, and interior awl bottom grading ring 7.1 has in the interior awl bottom insulating layer, and interior awl bottom grading ring 7.1 can improve the electric field of copper conductive piece and interior awl end juncture, avoids appearing electric field concentration phenomenon. A ground cutter equalizing part 7.2 is arranged at the connecting part of the conductive copper part counter bore and the ground cutter chamber, so that the electric field at the connecting part of the ground cutter chamber and the conductive copper part is improved, and the phenomenon of electric field concentration is avoided. The inner wall of the ground cutter chamber 1.1 is provided with a concave skirt edge 1.2, so that the creepage distance is increased, and the insulating capability is improved. The surfaces of the conductive copper parts between the upper inner cone bottom equalizing ring 7.1 and the lower inner cone bottom equalizing ring 7.1 and the connection parts of the conductive copper parts and the ground cutter equalizing ring 7.2 are provided with semi-conductive buffer layers 9, so that the stress caused by temperature rise of the conductive copper parts can be reduced. The grounding terminal 4.1 is arranged below the grounding copper piece and penetrates through the insulating layer 10. The grounding terminal 4.1 is provided with 2 grooves in the insulating layer, and an O-shaped ring 4.2 is arranged in the grooves and fixed with the insulating layer. Lip type sealing member 2.1, sealing washer 2.2, O type circle 4.2 realize the sealed of pull rod room 5 jointly, prevent that moisture and dust from getting into pull rod room and ground sword room, influencing insulation level.
The operating mechanism 3 adopts a gear set to drive the screw rod 3.1 to move. The operating mechanism is provided with a locking device and an unlocking device. When the grounding tool bit moves into the counter bore in the middle of the conductive copper part and is contacted with the spring contact finger of the grounding tool, the locking device is started. When the grounding cutter head moves to the position of the grounding copper piece, the unlocking device is started, and mechanical and electrical interlocking is released.
The semi-conductive buffer layer is mainly used for eliminating factors influencing partial discharge, such as tips, burrs and the like on the surface of the electric conductor; meanwhile, when the conductor generates heat, the stress between the solid insulating material and the conductor caused by expansion with heat and contraction with cold is buffered, and gaps and cracks of the solid insulating material are avoided. The resistance value of the semi-conductive buffer layer is between 3000 ohm and 6000 ohm. The thickness of the semi-conductive buffer layer is between 0.5 and 2 millimeters. The main components of the semiconductive buffer layer are carbon powder and silicon rubber. The semi-conductive buffer layer is uniformly mixed by adopting silicon rubber liquid and carbon powder, then is sprayed on the solid sealing part of the electric conductor, is solidified, and then is subjected to sand blasting, polishing and cleaning on the outer surface of the solidified buffer layer, and finally is subjected to solid sealing by being filled into an injection mold.
The cold plate for the shell body, the mechanism mounting plate are 45# steel, and the insulating part is made of stainless steel for preventing vortex.
The invention has the beneficial effects that: 1. the solid insulating material is adopted, so that the volume of the switch is reduced; 2. the voltage equalizing piece and the semi-conductive shielding grounding layer are adopted, so that the local discharge amount of the product is reduced; a semi-conductive buffer layer is adopted between the electric conductor and the sealing material, so that the insulation life of the product is prolonged; 3. the lip-shaped sealing element, the sealing ring and the O-shaped ring are combined for use, so that the dust and water vapor prevention capability of the pull rod chamber is improved, and the reliability of the product is improved; 4. the interlocking device improves the operation safety of the product.
Example 2
The switch connecting end is an outer conical interface and is provided with an outer conical flange. An electrified sensor which can play a role in pressure equalization is arranged in the outer cone flange. The solid insulating material is epoxy resin. The pressure equalizing piece is made of a stainless steel net with the thickness of 0.5 mm. The rest is the same as example 1.
Example 3
The solid insulating material is ethylene propylene diene monomer. The equalizing piece is made of carbon fibers through mold processing. The rest is the same as example 1.
Claims (7)
1. The utility model provides a railway traction becomes height and presses switch with earth, includes earthing switch utmost point post (1), mounting panel (2), operating mechanism (3), ground connection copper spare (4), earthing knife (6), electrically conductive copper spare (7), semi-conductive shielding layer (8), semi-conductive buffer layer (9), insulating layer (10), and earthing switch utmost point post (1) and operating mechanism (3) are located the both sides of mounting panel (2), its characterized in that: the operating mechanism (3) is matched with a screw thread (6.1) in the grounding knife (6) through a screw rod (3.1); the grounding knife (6) penetrates through the grounding copper piece (4), a guide block (4.3) is arranged on the grounding copper piece (4), the guide block (4.3) extends into the guide groove (6.2), and the grounding copper piece (4) is conducted with the grounding knife (6) through a grounding spring contact finger (4.4); a lip-shaped sealing element (2.1) is arranged in the through hole of the mounting plate (2) to wrap the grounding knife; a groove is formed in the flange surface at the bottom of the grounding switch pole, and a sealing ring (2.2) is arranged in the groove; the non-connection part on the surface of the solid insulating material is solidified with a semi-conductive shielding layer (8).
2. The railway traction high-voltage grounding switch according to claim 1, wherein: the grounding switch pole (1) is provided with an upper switch connecting end and a lower switch connecting end, a conductive copper part (7) is arranged in the middle of the switch connecting ends, a counter bore is arranged in the middle of the conductive copper part (7), grooves (7.3) are formed in the inner wall of the counter bore, a grounding knife spring contact finger (7.4) is arranged in the counter bore, 2 grooves (7.3) are formed in the conductive copper part in the switch connecting end, the switch connecting end is an inner conical interface, and an inner conical bottom equalizing ring (7.1) is arranged in an insulating layer (10) at the bottom of the; a pull rod chamber (5) and a ground knife chamber (1.1) are arranged in the ground switch pole (1).
3. The railway traction high-voltage grounding switch according to claim 2, wherein: the inner wall of the ground cutter chamber (1.1) is provided with a concave skirt edge (1.2), and a ground cutter equalizing part (7.2) is arranged at the connecting part of the conductive copper part counter bore and the ground cutter chamber (1.1).
4. The railway traction high-voltage grounding switch according to claim 3, wherein: the material of the ground knife equalizing and pressing piece (7.2) is stainless steel or carbon fiber.
5. The railway traction high-voltage grounding switch according to claim 1, wherein: the surface of the conductive copper part between the upper inner cone bottom equalizing ring (7.1) and the lower inner cone bottom equalizing ring and the connection part of the conductive copper part and the ground knife equalizing ring (7.2) is provided with a semi-conductive buffer layer (9).
6. The railway traction high-voltage grounding switch according to claim 5, wherein: the main components of the semi-conductive buffer layer are carbon powder and silicon rubber, the resistance value of the semi-conductive buffer layer (9) is 3000 ohm to 6000 ohm, and the thickness of the semi-conductive buffer layer is 0.5-2 mm.
7. The railway traction high-voltage grounding switch according to claim 6, wherein: the semi-conductive buffer layer is uniformly mixed by adopting silicon rubber liquid and carbon powder, then is sprayed on the solid sealing part of the electric conductor, is solidified, and then is subjected to sand blasting, polishing and cleaning on the outer surface of the solidified buffer layer, and finally is subjected to solid sealing by being filled into an injection mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910191356.0A CN109872914B (en) | 2019-03-14 | 2019-03-14 | Railway traction becomes high pressure and connects switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910191356.0A CN109872914B (en) | 2019-03-14 | 2019-03-14 | Railway traction becomes high pressure and connects switch |
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| Publication Number | Publication Date |
|---|---|
| CN109872914A CN109872914A (en) | 2019-06-11 |
| CN109872914B true CN109872914B (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910191356.0A Active CN109872914B (en) | 2019-03-14 | 2019-03-14 | Railway traction becomes high pressure and connects switch |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623231A (en) * | 2012-03-23 | 2012-08-01 | 中能电气（福清）有限公司 | Solid-sealed polar column unit for solid insulation switch equipment |
| CN108172446A (en) * | 2018-01-06 | 2018-06-15 | 北海银河开关设备有限公司 | A kind of earthing switch pole |
| CN108172447A (en) * | 2018-01-06 | 2018-06-15 | 北海银河开关设备有限公司 | A kind of electric locomotive earthing switch |
| CN209561266U (en) * | 2019-03-14 | 2019-10-29 | 北海银河开关设备有限公司 | A kind of rail traction change high voltage ground switch |
-
2019
- 2019-03-14 CN CN201910191356.0A patent/CN109872914B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102623231A (en) * | 2012-03-23 | 2012-08-01 | 中能电气（福清）有限公司 | Solid-sealed polar column unit for solid insulation switch equipment |
| CN108172446A (en) * | 2018-01-06 | 2018-06-15 | 北海银河开关设备有限公司 | A kind of earthing switch pole |
| CN108172447A (en) * | 2018-01-06 | 2018-06-15 | 北海银河开关设备有限公司 | A kind of electric locomotive earthing switch |
| CN209561266U (en) * | 2019-03-14 | 2019-10-29 | 北海银河开关设备有限公司 | A kind of rail traction change high voltage ground switch |
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| CN109872914A (en) | 2019-06-11 |
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Effective date of registration: 20210419 Address after: 536000 2 / F and 3 / F, information center building, Yinhe software science and Technology Park, 11 Tibet Road, Beihai City, Guangxi Zhuang Autonomous Region Patentee after: GUANGXI YINHE DECOM ELECTRIC Co.,Ltd. Address before: No. 11 Tibet Road, Haicheng District, Beihai City, Guangxi Zhuang Autonomous Region Patentee before: BEIHAI GALAXY SWITCH DEVICES Co.,Ltd. |
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Effective date of registration: 20210715 Address after: 225000 in Zhongman power Jiangsu Co., Ltd., Zhongman Road, high tech Development Zone, Yangzhou City, Jiangsu Province Patentee after: Jiangsu deyidikang Technology Co.,Ltd. Address before: 536000 2 / F and 3 / F, information center building, Yinhe software science and Technology Park, 11 Tibet Road, Beihai City, Guangxi Zhuang Autonomous Region Patentee before: GUANGXI YINHE DECOM ELECTRIC Co.,Ltd. |
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Effective date of registration: 20211213 Address after: 536000 2 / F and 3 / F, information center building, Yinhe software science and Technology Park, 11 Tibet Road, Beihai City, Guangxi Zhuang Autonomous Region Patentee after: Dikang Electric Co.,Ltd. Address before: 225000 in Zhongman power Jiangsu Co., Ltd., Zhongman Road, high tech Development Zone, Yangzhou City, Jiangsu Province Patentee before: Jiangsu deyidikang Technology Co.,Ltd. |
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