CN111276896A

CN111276896A - Three air chamber inflatable high-voltage switch

Info

Publication number: CN111276896A
Application number: CN202010197244.9A
Authority: CN
Inventors: 詹永钦; 周振业; 侯峰; 唐韬
Original assignee: GUANGXI YINHE DECOM ELECTRIC CO Ltd
Current assignee: GUANGXI YINHE DECOM ELECTRIC CO Ltd
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2020-06-12

Abstract

The invention discloses a three-air-chamber inflatable high-voltage switch which comprises a high-voltage switch air tank, an isolation operating mechanism and a breaker operating mechanism, wherein the high-voltage switch air tank is divided into a bus air chamber, an isolation switch air chamber and a breaker air chamber, the breaker air chamber is positioned at the lower part, the bus air chamber is positioned at the upper left part of the breaker air chamber, and the isolation switch air chamber is positioned at the upper right part of the breaker air chamber. And a bus sleeve is fixed on the partition plate of the bus air chamber and the isolating switch air chamber. And isolation sleeves are arranged on the partition plates of the isolation switch air chamber and the breaker air chamber. The bus air chamber, the isolating switch air chamber and the breaker air chamber are welded into a whole by laser, are sealed into independent air chambers and are respectively provided with a pressure relief port. The invention reduces the volume of the switch; three air chamber structures have improved gas tank bulk strength, separate generating line, isolator and circuit breaker simultaneously, have improved switchgear's security.

Description

Three air chamber inflatable high-voltage switch

Technical Field

The invention relates to the field of high-voltage electrical equipment, in particular to a three-air-chamber inflatable high-voltage switch.

Background

With the continuous development of Chinese economy, the power industry has been developed greatly. High-voltage switchgear plays an increasingly active role as a means of load distribution and protection for electrical power systems. The high-voltage switch equipment in China mainly adopts two major insulation technologies, one is a solid insulation technology, and the other is a gas insulation technology. In the prior art, the gas insulation technology is mainly used for switching equipment in a 40.5kV voltage class of a transmission and distribution network. The main technical scheme is that components such as a circuit breaker, a disconnecting switch and a bus are installed in an air box, and insulation between the switch and phases is achieved by filling insulating gas (such as sulfur hexafluoride gas) into the air box. Because 40.5kV inflatable high tension switchgear, the volume is great, and short circuiter action moment electrodynamic force is great, leads to the gas tank to take place deformation easily, influences the connection reliability of generating line, and the on-the-spot installation requirement is also higher.

Disclosure of Invention

The invention aims to provide a three-air-chamber inflatable high-voltage switch which is small in size, reliable in connection and high in safety.

In order to achieve the purpose, the technical scheme of the invention is as follows: a three-air-chamber inflatable high-voltage switch comprises a high-voltage switch air tank, an isolation operating mechanism and a breaker operating mechanism, wherein the high-voltage switch air tank is divided into a bus air chamber, an isolation switch air chamber and a breaker air chamber, the breaker air chamber is located at the lower part, the bus air chamber is located at the upper left of the breaker air chamber, and the isolation switch air chamber is located at the upper right of the breaker air chamber. And a bus sleeve is fixed on the partition plate of the bus air chamber and the isolating switch air chamber. And isolation sleeves are arranged on the partition plates of the isolation switch air chamber and the breaker air chamber. The isolation operating mechanism is positioned outside the right side of the isolation air chamber, and the breaker operating mechanism is positioned outside the right side of the breaker air chamber. The high-voltage switch air box is welded by a stainless steel plate through a laser welding process. The bus air chamber, the isolating switch air chamber and the breaker air chamber are welded into a whole by laser, are sealed into independent air chambers and are respectively provided with a pressure relief port.

The bus air chamber is provided with a bus air chamber pressure relief opening, a bus connecting seat, a bus and a bus sleeve, wherein the bus connecting seat, the bus and the bus sleeve are respectively provided with A, B, C three phases, and the bus is connected with the bus connecting seats in front of and behind the bus air chamber and is connected with a bus copper terminal of the bus sleeve. The bus is formed by bending a copper bar or a round copper wire.

The isolating switch air chamber is provided with an air chamber pressure relief opening and an isolating switch, the isolating switch is connected with the movable end of the breaker at the middle part of the breaker air chamber through an isolating sleeve, and the static end of the tail part of the breaker is connected with the wire inlet copper terminal of the inner cone sleeve at the lower part of the breaker air chamber through a wire outlet copper bar.

The bus bushing is internally provided with a bus copper terminal, an inner conical cavity, an insulating layer, an insert, a grounding grading ring and a high-voltage grading ring. The middle position outside the bus sleeve is provided with a flange. The surface of the bus sleeve flange is provided with an insert, and a sealing groove is formed outside the insert. The bus sleeve penetrates through the partition plate, the insert on the partition plate is provided with a connecting hole at a corresponding position, and the screw penetrates through the partition plate and is screwed into the insert to fix the bus sleeve on the partition plate. The bus sleeve is sealed with the partition plate through an O-shaped ring in a groove on the flange surface. The bus bushing is internally provided with a grounding equalizing ring and a high-voltage equalizing ring which cover the flange surface, and the bus bushing has the functions of solving the problem of electric field concentration at the joint of the flange and the partition plate and eliminating the corona phenomenon. The grounding grading ring and the high-voltage grading ring are located in the bus sleeve insulating layer, and the thickness of the insulating layer between the grounding grading ring and the high-voltage grading ring is larger than 20 mm. The thickness of the insulating layer between the grounding grading ring and the outer surface of the bus sleeve is larger than 3 mm. The thickness of the insulating layer between the high-voltage grading ring and the inner conical surface in the middle of the bus sleeve is larger than 3 mm. The outer edge of the grounding grading ring is outwards turned, the outer edge of the high-voltage grading ring is inwards turned, and the purpose is to avoid the edge sealing and burrs at the edge from influencing the electric field grading distribution. The grounding grading ring is connected with the insert and is conducted with the grounding wire through the partition plate and the box body. And the high-voltage grading ring is connected with the outer edge of the bus copper terminal.

The insulating layer is made of solid insulating material, preferably epoxy resin or ethylene propylene diene monomer.

The grounding grading ring and the high-voltage grading ring can be made of metal mesh materials, such as stainless steel meshes, iron wire meshes and copper wire meshes; the conductive material can also be made of a semiconductive material, such as nylon and carbon fiber or glass fiber and carbon powder which are subjected to die casting through a die.

The isolating switch comprises a fixed copper conductive piece, a sliding copper conductive piece, a grounding end and an insulating screw rod. The fixed copper conductive piece is a T-shaped hollow cylinder, is internally provided with a groove, and is connected with the sliding copper conductive piece through a spring contact finger in the horizontal direction; the vertical direction is connected with the copper part at the upper end of the isolation sleeve through the spring contact finger. The sliding copper conductive piece is provided with a guide groove matched with a guide block in the fixed copper conductive piece, so that the sliding copper conductive piece and the insulating screw rod are prevented from synchronously rotating. The middle of the sliding copper conductive piece is provided with a thread hole matched with the thread of the insulating screw rod.

The working principle of the isolating switch is as follows: the sliding copper conductive piece is arranged in the fixed copper conductive piece, the insulating screw rod is screwed into the sliding copper conductive piece, and the sliding copper conductive piece is pushed to advance or retreat by forward or reverse rotation of the isolation operating mechanism; when the sliding copper conductive piece extends into the bus copper terminal and is connected with the spring contact finger, the bus is connected with the circuit breaker; when the sliding copper conductive piece exits from the bus sleeve, the bus sleeve is in an isolated state; when the sliding copper conductive piece is connected with the spring contact finger in the grounding end, the connection between the circuit breaker and the ground is realized.

The breaker is composed of a breaker pole and a breaker operating mechanism and is positioned on two sides of a left side plate of a breaker air chamber. The circuit breaker pole comprises a vacuum arc extinguish chamber, a static end copper part, an insulating layer, a movable end copper part and the like. The movable end copper part is positioned in the middle of a pole of the circuit breaker, the connecting end is upward, and the movable end copper part is connected with the isolation sleeve through a spring contact finger. The static end copper part is positioned at the tail part of the pole of the circuit breaker and is connected with the wire inlet copper terminal of the inner cone sleeve through a copper bar. The vacuum arc extinguish chamber is positioned in the pole of the circuit breaker, and the outer part of the vacuum arc extinguish chamber is an insulating layer. The static end of the vacuum arc extinguish chamber is connected with the static end copper piece, and the moving end of the vacuum arc extinguish chamber is connected with the moving end copper piece.

The inner taper sleeve is longitudinally distributed and is positioned at the lower part of the breaker air chamber. The inner taper sleeve opening faces the lower part of the air box. And a voltage equalizing piece is arranged in the wire inlet copper terminal of the inner conical sleeve and the insulating layer of the transition area of the inner conical surface. The voltage equalizing piece is connected with the wire inlet copper terminal and is used for eliminating the electric field concentration phenomenon when the inner conical surface is connected with the cable sleeve and for homogenizing the electric field distribution in the inner conical sleeve.

The invention has the beneficial effects that: 1. the circuit breaker adopts a vacuum arc extinguish chamber and is fixed through an insulating bracket, so that heat dissipation is facilitated, and the size of the switch is reduced; 2. the three-air-chamber structure improves the overall strength of the air box, and simultaneously separates the bus, the isolating switch and the breaker through the air chamber, thereby improving the safety of the switch equipment; 3. the strength of the bus chamber air chamber is improved, and the difficulty of bus connection is reduced.

Drawings

FIG. 1 is a schematic diagram of a three-chamber inflatable high-voltage switch

The reference numbers illustrate: 1. the bus air chamber, 1.1, the bus connection seat, 1.2, the bus connection copper bar, 2, the isolator air chamber, 3, the circuit breaker air chamber, 4, the isolator, 4.1, the slip copper conductive piece, 4.2, the earthing terminal, 4.3, the insulated lead screw, 5, the circuit breaker, 6, the inner cone sleeve, 6.1, the uniform piece, 6.2, the incoming line copper terminal, 7, the isolation operating mechanism, 8, the circuit breaker operating mechanism, 9, the bus sleeve, 9.1, the ground voltage-sharing ring, 9.2, the high voltage-sharing ring, 9.3 insulating layer, 9.4, the bus copper terminal, 10, the isolation sleeve.

Detailed Description

The technical solution of the present invention is further described below with reference to the accompanying drawings.

Example 1

Fig. 1 is a right-side schematic view of the present invention, in which a left side sealing plate of a high-voltage switch gas box is removed for convenience of explanation, and an inner tapered bushing 6 and a bus bushing 9 are processed in a sectional view. As shown in figure 1, the three-air chamber inflatable high-voltage switch has the switch rated voltage of 40.5kV, the rated current of 2500A-4000A and the width of an air box of 800 mm. The utility model provides a three air chamber inflatable high voltage switch, includes high voltage switch air tank, keeps apart operating mechanism 7 and circuit breaker operating mechanism 8, and high voltage switch air tank divide into generating line air chamber 1, isolator air chamber 2, circuit breaker air chamber 3, and circuit breaker air chamber 3 is located the lower part, and generating line air chamber 1 is located circuit breaker air chamber 3 upper left side, and isolator air chamber 2 is located circuit breaker air chamber 3 upper right side. And a bus sleeve 9 is fixed on the partition board of the bus air chamber 1 and the isolating switch air chamber 2. The partitions of the disconnector gas chamber 2 and the breaker gas chamber 3 are provided with isolating sleeves 10. The isolation operating mechanism 7 is positioned outside the right side of the isolation air chamber 2, and the breaker operating mechanism 8 is positioned outside the right side of the breaker air chamber 3. The high-voltage switch air box is welded by a stainless steel plate through a laser welding process. The bus air chamber, the isolating switch air chamber and the breaker air chamber are welded into a whole by laser, are sealed into independent air chambers and are respectively provided with a pressure relief port.

The bus air chamber 1 is provided with a bus air chamber pressure relief opening, a bus connecting seat 1.1, a bus 1.2 and a bus sleeve 9. The bus connecting seat 1.1, the bus 1.2 and the bus sleeve 9 respectively have A, B, C three phases, and the bus 1.2 is connected with the bus connecting seats 1.1 at the front and the back of the bus air chamber and is connected with the bus copper terminal 9.4 of the bus sleeve 9.

The isolating switch air chamber 2 is provided with an air chamber pressure relief opening and an isolating switch 4, the isolating switch 4 is connected with the moving end of the breaker 5 at the middle part of the breaker air chamber 3 through an isolating sleeve 10, and the static end of the tail part of the breaker 5 is connected with the wire inlet copper terminal 6.2 of the inner cone sleeve 6 at the lower part of the breaker air chamber 3 through a wire outlet copper bar.

And a bus copper terminal 9.4, an inner conical cavity, an insulating layer 9.3, an insert, a grounding grading ring 9.1 and a high-voltage grading ring 9.2 are arranged in the bus sleeve 9. The bus bar sleeve 9 is externally provided with a flange at the middle position. An insert is arranged on the flange surface of the bus sleeve 9, and a sealing groove is arranged outside the insert. The bus sleeve penetrates through the partition plate, the insert on the partition plate is provided with a connecting hole at a corresponding position, and the screw penetrates through the partition plate and is screwed into the insert to fix the bus sleeve on the partition plate. The bus sleeve 9 is sealed with the partition plate through an O-shaped ring in a groove on the flange surface. A grounding equalizing ring 9.1 and a high-voltage equalizing ring 9.2 are arranged in the bus sleeve 9 and cover a flange surface, and the bus sleeve has the functions of solving the problem of electric field concentration at the joint of the flange and the partition plate and eliminating the corona phenomenon. The grounding grading ring 9.1 and the high-voltage grading ring 9.2 are positioned in the bus sleeve insulating layer 9.3, and the thickness of the insulating layer between the grounding grading ring 9.1 and the high-voltage grading ring 9.2 is larger than 20 mm. The thickness of the insulating layer between the grounding grading ring 9.1 and the outer surface of the bus sleeve is more than 3 mm. The thickness of the insulating layer between the high-voltage grading ring 9.2 and the inner conical surface in the middle of the bus sleeve is larger than 3 mm. The outer edge of the grounding grading ring 9.1 is outwards turned, the outer edge of the high-voltage grading ring 9.2 is inwards turned, and the purpose is to avoid the edge sealing and burrs at the edge from influencing the electric field grading distribution. And the grounding grading ring 9.1 is connected with the insert and is conducted with the grounding wire through the partition plate and the box body. And the high-voltage grading ring 9.2 is connected with the outer edge of the bus copper terminal.

The isolating switch 4 comprises a fixed copper conductive piece, a sliding copper conductive piece 4.1, a grounding end 4.2 and an insulating screw rod 4.3. The fixed copper conductive piece is a T-shaped hollow cylinder, is internally provided with a groove, and is connected with the sliding copper conductive piece through a spring contact finger in the horizontal direction; the vertical direction is connected with the copper part at the upper end of the isolation sleeve through the spring contact finger. The sliding copper conductive piece is provided with a guide groove matched with a guide block in the fixed copper conductive piece, so that the sliding copper conductive piece and the insulating screw rod are prevented from synchronously rotating. The middle of the sliding copper conductive piece is provided with a thread hole matched with the thread of the insulating screw rod. The insulation screw rod 4.3 passes through the grounding end 4.2 to be connected with the isolation operating mechanism 7.

The working principle of the isolating switch is as follows: the sliding copper conductive piece 4.1 is arranged in the fixed copper conductive piece, the insulating screw rod 4.3 is screwed into the sliding copper conductive piece, and the sliding copper conductive piece 4.1 is pushed to advance or retreat by the forward or reverse rotation of the isolation operating mechanism 7; when the sliding copper conductive piece 4.1 extends into the bus copper terminal 9.4 and is connected with the spring contact finger, the bus is connected with the breaker; when the sliding copper conductive piece 4.1 exits from the bus sleeve, the bus sleeve is in an isolated state; when the sliding copper conductive piece 4.1 is connected with the spring contact finger in the grounding end 4.2, the connection between the circuit breaker and the ground is realized.

The breaker 5 is composed of a breaker pole and a breaker operating mechanism 8 and is positioned on two sides of the left side plate of the breaker air chamber 3. The circuit breaker pole comprises a vacuum arc extinguish chamber, a static end copper part, an insulating layer, a movable end copper part and the like. The moving end copper part is positioned in the middle of a pole of the circuit breaker, the connecting end is upward, and the moving end copper part is connected with the isolation sleeve 10 through a spring contact finger. The static end copper part is positioned at the tail part of the pole of the circuit breaker and is connected with the wire inlet copper terminal of the inner cone sleeve through a copper bar. The vacuum arc extinguish chamber is positioned in the pole of the circuit breaker, and the outer part of the vacuum arc extinguish chamber is an insulating layer. The static end of the vacuum arc extinguish chamber is connected with the static end copper piece, and the moving end of the vacuum arc extinguish chamber is connected with the moving end copper piece.

The inner taper sleeve 6 is distributed longitudinally and is positioned at the lower part of the breaker air chamber. The opening of the inner taper sleeve 6 faces the lower part of the air box. A voltage equalizing piece 6.1 is arranged in an insulating layer of a transition area between the wire inlet copper terminal 6.2 of the inner conical sleeve and the inner conical surface. The voltage equalizing piece 6.1 is connected with the wire inlet copper terminal 6.2, and the voltage equalizing piece is used for eliminating the electric field concentration phenomenon when the inner conical surface is connected with the cable sleeve and for homogenizing the electric field distribution in the inner conical sleeve.

Claims

1. Three air chamber inflatable high voltage switch, including high voltage switch gas tank, isolation operating mechanism (7) and circuit breaker operating mechanism (8), its characterized in that: the high-voltage switch air box is divided into a bus air chamber (1), a disconnecting switch air chamber (2) and a breaker air chamber (3), the breaker air chamber (3) is positioned at the lower part, the bus air chamber (1) is positioned at the upper left of the breaker air chamber (3), and the disconnecting switch air chamber (2) is positioned at the upper right of the breaker air chamber (3); a bus sleeve (9) is fixed on the partition board of the bus air chamber (1) and the isolating switch air chamber (2); isolation sleeves (10) are arranged on the partition plates of the isolation switch air chamber (2) and the breaker air chamber (3); the isolation operating mechanism (7) is positioned outside the right side of the isolation air chamber (2), and the breaker operating mechanism (8) is positioned outside the right side of the breaker air chamber (3).

2. The three-chamber inflatable high-pressure switch of claim 1, wherein: the high-voltage switch air box, the bus air chamber (1), the isolating switch air chamber (2) and the breaker air chamber (3) are formed by welding stainless steel plates.

3. The three-chamber inflatable high-pressure switch of claim 1, wherein: the bus air chamber (1) is provided with a bus air chamber pressure relief opening, a bus connecting seat (1.1), a bus (1.2) and a bus sleeve (9); the bus (1.2) is connected with the bus coupling seats (1.1) at the front and the rear of the bus air chamber and is connected with a bus copper terminal (9.4) of the bus sleeve (9).

4. The three-chamber inflatable high-pressure switch of claim 1, wherein: a bus copper terminal (9.4), an inner conical cavity, an insulating layer (9.3), an insert, a grounding equalizing ring (9.1) and a high-voltage equalizing ring (9.2) are arranged in the bus sleeve (9); a flange is arranged at the middle position outside the bus sleeve (9), an insert is arranged on the flange surface, and a sealing groove is arranged outside the insert; the grounding grading ring (9.1) and the high-voltage grading ring (9.2) are positioned in the bus sleeve insulating layer (9.3) and cover the flange surface.

5. The three-chamber inflatable high-pressure switch of claim 4, wherein: the thickness of the insulating layer between the grounding grading ring 9.1 and the high-voltage grading ring 9.2 is larger than 20 mm, the thickness of the insulating layer between the grounding grading ring 9.1 and the outer surface of the bus sleeve is larger than 3 mm, and the thickness of the insulating layer between the high-voltage grading ring 9.2 and the inner conical surface in the middle of the bus sleeve is larger than 3 mm.

6. The three-chamber inflatable high-pressure switch of claim 1, wherein: the isolating switch (4) comprises a fixed copper conductive piece, a sliding copper conductive piece (4.1), a grounding end (4.2) and an insulating screw rod (4.3); the fixed copper conductive piece is a T-shaped hollow cylinder, is internally provided with a groove, and is connected with the sliding copper conductive piece through a spring contact finger in the horizontal direction; the fixed copper conductive piece is connected with a copper piece at the upper end of the isolation sleeve (10) through a spring contact finger in the vertical direction; a guide groove is arranged on the sliding copper conductive piece (4.1) to be matched with a guide block in the fixed copper conductive piece; the middle of the sliding copper conductive piece (4.1) is provided with a thread hole matched with the thread of the insulating screw rod (4.3).