CN101320891B - Side-mounted removable high-voltage switchgear - Google Patents

Abstract

The invention relates to a side-mounted removable high-voltage switchgear for receiving and distributing electric energy, including a busbar room, a circuit breaker room, a relay instrument room, a cable room and a pressure relief room. The three-phase poles of the circuit breaker are installed in the switchgear The front and rear directions are arranged longitudinally, and the moving direction of the circuit breaker handcart is vertical. The upper static contact is directly fixed on the main busbar through the contact box with the function of an insulating bushing, and no additional branch busbars are required. The handcart moves up and down through the electric or manual lifting mechanism to enter the working position or test isolation position, and the circuit is broken. The switch can be operated by electric closing and opening, and can also be operated by the manual emergency mechanical closing and opening button installed on the front panel. The isolation fracture of the main contact can be clearly seen through the observation window installed on the front panel.

Description

Side-mounted removable high-voltage switchgear

technical field

The invention belongs to the technical field of high-voltage electrical equipment, and relates to a side-mounted removable high-voltage switch cabinet for receiving and distributing electric energy.

Background technique

At present, the three-phase poles of the general removable high-voltage switchgear circuit breaker are arranged horizontally. The handcart of the circuit breaker is moved backward through the manual propulsion mechanism and inserted into the upper and lower pairs of static contact boxes. The handcart enters the working position. The operating mechanism is far away from the front panel of the switch cabinet, which makes it difficult to operate the manual emergency mechanical opening button; the handcart of the circuit breaker moves forward and is pulled out from the static contact box through the manual extraction mechanism, and the handcart enters the isolation test position. The blockage arranged on the front of the vehicle prevents the main contact from having obvious fractures; the installation of the grounding switch on the front can only be operated longitudinally through transmission conversion; the three-phase poles of the circuit breaker are arranged horizontally and the switch cabinet is relatively wide; The length of the main circuit is increased; because the switch between the working position of the handcart and the isolation test position needs to move forward and backward for a certain distance, the depth direction of the switchgear is longer, which increases the occupied area.

In order to overcome the above shortcomings, the utility model patent 02259031.5 refers to the structure of the VISAX high-voltage switchgear of GEC Alstom Company in the United Kingdom, and develops a three-phase pole side-mounted, a vacuum circuit breaker or its three-phase pole part that is rotated 90° longitudinally to form a working position and Isolate the test location. Although the side-mounted vertical rotary structure overcomes many shortcomings of the former in many aspects, it brings its own shortcomings as follows: the vertical rotation of the vacuum circuit breaker or its three-phase pole part by 90° is easy to make the metal powder produced by arc combustion adhere to The insulating material on the inner side of the vacuum interrupter affects the insulation strength between the fractures of the vacuum circuit breaker, the electric field distribution of the vacuum interrupter and the breaking capacity; the pole of the three-phase vacuum interrupter rotates in the switch cabinet as a high-voltage live element, The moving track of high-voltage live parts is long. Considering the need for electrical clearance during the rotation process, the size of the isolation insulating cover is large, the cost is high, and the width of the switchgear is relatively large; the transmission and mechanical interlocking are relatively complicated when rotating; the vacuum circuit breaker When the operating mechanism does not rotate with the pole of the three-phase vacuum interrupter, a more complicated drive/rotation conversion pair is required, and the connection strength and stability between the operating mechanism and the pole of the three-phase vacuum interrupter are worse than the fixed connection; When the lower plug socket is charged, such as the power receiving cabinet or the contact cabinet where the cable enters the line, it is difficult to separate the lower plug socket with high voltage with the linkage valve during the rotation process, and the safety performance is poor; the upper contact box is directly connected to the main contact box. As a static contact, the busbar has higher requirements on the wear resistance, surface condition, dimensional deviation and installation accuracy of the main busbar, and the static contact is difficult to replace.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a switchgear with small width and depth, which can be equipped with manual emergency closing and opening buttons, has a clearly visible isolation fracture of the handcart, a lifting mechanism and an upper and lower valve drive. Simple, side-mounted removable high-voltage switchgear with no branch busbars in the main circuit, few connectors, short current-carrying lines, and few heat points.

According to the technical solution provided by the present invention, a pressure relief chamber is provided on the rear wall of the housing, a relay instrument room is provided on the upper part of the front wall of the housing, and a busbar room, a circuit breaker room and a cable A circuit breaker handcart is installed in the circuit breaker chamber, a lower moving contact is arranged in the middle of the three-phase pole of the circuit breaker in the circuit breaker handcart, and a lower moving contact that matches the lower moving contact is fixed on the inner wall of the housing. The static contact is connected with a current transformer at the bottom of the lower static contact, and the bottom of the current transformer is connected with the grounding switchgear. The top of the pole of each phase circuit breaker is the upper moving contact. The upper static contact matched with the upper moving contact is characterized in that: there is a lifting mechanism under the circuit breaker handcart, the three-phase poles of the circuit breaker are arranged longitudinally in the front and rear direction of the housing, and the circuit breaker handcart is positioned at the bottom of the lifting mechanism. Driven, move up and down to enter the working position or test isolation position.

There is a fixed partition between the busbar room and the circuit breaker room; a fixed insulating contact box is covered outside the upper static contact, and the upper static contact is directly connected to the busbar without additional branch busbars; An insulating contact box is covered outside the lower static contact.

The circuit breaker handcart includes a circuit breaker operating mechanism, a circuit breaker chassis, a circuit breaker three-phase pole and a handcart chassis.

The connecting part of the lower static contact and the current transformer is covered with an insulating cylinder fixedly arranged on the top end surface of the current transformer.

The lifting mechanism includes a handcart bracket, a rocking arm and a rotating shaft, and the two ends of the rocking arm are respectively hinged to the handcart bracket and the rotating shaft, so that the handcart bracket, the rocking arm and the rotating shaft form a parallelogram frame. The bottom of the body is provided with an operating shaft whose outer end passes through the housing, and the inner end of the operating shaft and the rotating shaft are transmitted through a worm gear mechanism.

There are guide plates fixed on the shell on both sides of the handcart bracket, and guide grooves are opened on the guide plate. The side wall of the handcart bracket is provided with a guide shaft inserted into the guide groove. The guide groove makes the handcart move through the guide shaft. The bracket can only move up and down.

An upper valve for isolation is provided between the upper moving contact and the upper static contact in the circuit breaker chamber. The upper valve is slidably connected to a cross bar at one end of the circuit breaker, and a rotatable push plate is provided on the housing. The rollers on the push plate make the push plate rotate around its rotation axis under the action of the handcart moving up and down, and the valve is pushed to slide on the cross bar through the connecting rod hinged with the push plate to achieve the purpose of isolating the upper movable contact and the static contact. ;

There is a lower valve for isolation between the lower moving contact and the lower static contact; the lower valve is a slidable and "L"-shaped partition, and the lower valve is guided by a special guide groove to make it follow the circuit breaker handcart. It slides up and down to achieve the purpose of isolating the lower moving contact and the static contact.

Use the observation window installed on the front door of the circuit breaker room to observe the isolation fracture of the main contact. When the circuit breaker handcart is in the test isolation position, the valve linked with the movement of the circuit breaker handcart automatically isolates the charged upper and lower static contacts. Under the premise of not changing the transmission direction, the vertically arranged grounding switch can be directly operated.

The beneficial effects of the present invention are: the width and depth of the switchgear are small, which realizes the miniaturization of the removable switchgear, which is beneficial to save the occupied area; the main contacts of the switchgear have obvious fractures; the front panel can be installed with manual mechanical emergency Closing and opening buttons; lifting mechanism and upper and lower valve transmission are simple, and mechanical interlocking is easy to realize; the main circuit has no branch busbars, fewer joints, short current-carrying lines, and fewer heating points.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a cross-sectional view along line A-A of Fig. 1 .

Detailed ways

The present invention will be further described below in conjunction with specific drawings and embodiments.

As shown in the figure: a pressure relief chamber 12 is provided on the rear wall of the housing 1, a pressure relief chamber cover 2 is provided on the top of the pressure relief chamber 12, a relay instrument room 17 is provided on the upper part of the front wall of the housing 1, and the housing 1. The inner space of 1 is busbar chamber 18, circuit breaker chamber 16 and cable chamber 14 from top to bottom. In circuit breaker chamber 16, circuit breaker operating mechanism 24, circuit breaker chassis 27, circuit breaker three-phase pole 9 and For the circuit breaker handcart composed of the handcart chassis 39, the bottom surface of the cable chamber 14 is provided with a cable plug 13, and the middle part of each phase circuit breaker pole 9 is provided with a lower moving contact 8, and the circuit breaker chamber 16 is fixed with a The lower static contact 20 matched with the lower moving contact 8 is covered with an insulating contact box 19, and the bottom end of the lower static contact 20 is connected with a current transformer 22, and the bottom end of the current transformer 22 is connected with a grounding switch device, the grounding switch device includes a grounding switch 23 and a grounding switch main shaft 26, and the top of each phase circuit breaker pole 9 is an upper moving contact 5, and an upper static contact 4 matching it is arranged above the upper moving contact 5, The upper static contact 4 directly connected to the busbar 3 is covered with an insulating contact box 28, a partition 38 is fixedly arranged between the busbar chamber 18 and the circuit breaker chamber 16, and a lifting mechanism 11 is connected below the circuit breaker handcart. The moving direction of the handcart of the circuit breaker is the vertical direction, and the three-phase poles 9 of the circuit breaker are longitudinally arranged in the front and rear direction of the housing.

The connection part between the lower static contact 20 and the current transformer 22 is covered with an insulating cylinder 21 fixedly arranged on the top surface of the current transformer 22 . An insulating sleeve 29 is provided where the main bus bar 3 passes through the casing 1 .

Described lifting mechanism 11 comprises handcart bracket 30, rocking arm 32 and rotating shaft 31, and the two ends of handcart bracket 30 and rotating shaft 31 are all hinged with rocking arm 32, make handcart bracket 30, rocking arm 32 and rotating shaft 31 forms a parallelogram frame body, and an operating shaft 15 whose outer end passes through the housing 1 is arranged at the bottom of the frame body, and the inner end of the operating shaft 15 and the rotating shaft 31 are transmitted through a worm gear mechanism.

The two sides of the handcart bracket 30 are provided with guide plates 10 fixed on the shell 1, the guide plate 10 is provided with a guide groove 33, and the side wall of the handcart bracket 30 is provided with a guide shaft 34 inserted into the guide groove 33, The guide groove 33 makes the handcart bracket 30 only move up and down by the guide shaft 34.

An upper valve 6 for isolation is provided between the upper moving contact 5 and the upper static contact 4 in the circuit breaker chamber 16 . The upper valve 6 is slidably connected to the cross bar 35 at one end, and the casing 1 is provided with a rotatable push plate 36, and the rollers installed on the push plate 36 make the push plate 36 rotate around under the action of the handcart moving up and down. Its rotating shaft rotates, and the connecting rod hinged with the push plate 36 pushes the valve 6 to slide on the cross bar 35 to achieve the purpose of isolating the upper movable contact 5 and the static contact 4; the lower movable contact 8 and the lower static contact 20 There is a lower valve 7 for isolation. The lower valve 7 is a slidable and "L"-shaped partition, and the lower valve 7 slides with the up and down movement of the circuit breaker handcart through a special guide groove, so as to isolate the lower moving contact 8 from the static contact. The first 20 goals.

Arrange the three-phase poles 9 on the circuit breaker sideways in the front, middle and rear. The upper movable contact 5 is installed on the top of the poles, and the upper static contact 4 is directly fixed on the main bus 3, without additional branch bus; The middle part of the pole 9 is equipped with a lower movable plug 8, and the lower static contact 20 is connected with the current transformer 22 through the insulating contact box 19, and the other end of the current transformer 22 is connected with the lead-out cable and the static contact of the grounding switch 23, and the grounding switch 23 Arranged vertically, the main shaft 26 of the grounding switch is directly operated to close and open the grounding switch, without transmission conversion to change the operating direction. The circuit breaker handcart moves upwards into the working position through the electric or manual lifting mechanism 11. The circuit breaker handcart can perform closing and opening operations, that is, electric operation, or through the manual mechanical closing and opening buttons installed on the front door 25. Operation: After the handcart of the circuit breaker is opened, move down to the isolation test position through the electric or manual lifting mechanism 11, and the isolation fracture of the main contact can be clearly seen through the observation window installed on the front door 25; the handcart of the circuit breaker can also be used Pull out from the switch cabinet to enter the maintenance and replacement position. During the up and down movement of the circuit breaker trolley, the upper valve 6 and the lower valve 7 linked with the lifting mechanism 11 automatically open or close the static contact box. Electrical and mechanical locking devices are installed between the opening and closing of the switch cabinet door, the movement of the lifting mechanism 11, the closing and opening operation of the circuit breaker and the closing and opening operation of the grounding switch 23 to ensure the safety of the operation. Since the three-phase poles 9 are longitudinally arranged in the front and rear direction of the housing 1, the width of the switch cabinet is small. Since the handcart of the circuit breaker moves up and down instead of forward and backward, the depth of the switchgear is also very small.

The high-voltage switchgear includes a busbar room 18 , a circuit breaker room 16 , a relay instrument room 17 , a cable room 14 and a pressure relief room 12 . The three-phase poles 9 of the vacuum circuit breaker handcart are arranged longitudinally in the front and back of the switch cabinet, which is beneficial to reduce the width of the switch cabinet; the top of the three-phase poles 9 is provided with a moving plug 5, and the static plug 4 is directly fixed on the main bus 3 No additional branch bus is needed; the position shown in Figure 1 is the working position where the plug socket is in the plugged state, and the circuit breaker can perform closing and opening operations. Since the circuit breaker operating mechanism 24 is relatively close to the front door 25 of the circuit breaker room, the The manual emergency mechanical closing and opening button on the front door 25 can operate the circuit breaker operating mechanism 24 to close or open the circuit breaker; after the circuit breaker is opened, the operating shaft 15 and the lifting mechanism 11 are operated by electric or manual operation of the lifting mechanism Under the action of the guide plate 10, the handcart of the circuit breaker can be moved downward for a certain distance to the isolation test position of the handcart. At the same time, the valve 6 and the valve 7 linked with the movement of the handcart of the circuit breaker can automatically isolate the upper static contact 4 and the lower static contact. The head 20 ensures that the high-voltage live static contact cannot be touched, which meets the safety requirements of the switch cabinet, and the obvious isolation and disconnection points of the upper and lower plugs can be directly observed through the transparent observation window on the front door 25 of the circuit breaker room; Moving up and down in the switch cabinet instead of moving back and forth is conducive to reducing the depth of the switch cabinet and reducing the occupied area; the grounding switch 23 is arranged vertically, and the grounding switch spindle 26 is directly operated to close and open the grounding switch without transmission. Transform to change the direction of operation.

Claims (6)

1. side-installed shifting type high-tension switch cabinet, be included in the release chamber (12) that is provided with on housing (1) rear wall, the relay control room (17) that is provided with on housing (1) antetheca top, the bus-bar room (18) that sets gradually from top to bottom in the inner space of housing (1), breaker chamber (16) and cable vault (14), in breaker chamber (16), circuit breaker cart is set, the middle part of the circuit breaker three-phase pole (9) in circuit breaker cart is provided with lower moving contact (8), inwall at housing (1) is fixed with the following fixed contact (20) that cooperates with lower moving contact (8), bottom at following fixed contact (20) is connected with current transformer (22), the bottom of current transformer (22) connects Grunding switch gear device, the top of every phase circuit breaker polar (9) is last moving contact (5), be provided with the upper static contact (4) that cooperates with last moving contact (5) in the top of breaker chamber (16), it is characterized in that: hoisting mechanism (11) is arranged below circuit breaker cart, circuit breaker three-phase pole (9) is vertically arranged at the fore-and-aft direction of housing (1), circuit breaker cart moves up and down and enters service position or test isolated location under the drive of hoisting mechanism (11);

Described hoisting mechanism (11) comprises handcart carriage (30), rocking arm (32) and rotating shaft (31), in hinged handcart carriage (30) and the rotating shaft (31) respectively of the two ends of rocking arm (32), make handcart carriage (30), rocking arm (32) and rotating shaft (31) form the support body of parallelogram, support body bottom at this parallelogram is provided with the operating axis (15) that the outer end passes housing (1), and the inner of operating axis (15) and rotating shaft (31) are by the worm-and-wheel gear transmission;

Be provided with the last valve (6) of isolating usefulness between last moving contact (5) in breaker chamber (16) and the upper static contact (4), the described valve (6) of going up is slidingly connected on the cross bar (35) that is positioned at valve (6) one ends, on shell (1), be provided with rotatable slurcam (36), the roller that is installed on the slurcam (36) makes slurcam (36) around its rotating shaft rotation under the effect that handcart moves up and down, go up at cross bar (35) and slide by promoting to go up valve (6), reach and isolate the purpose that goes up moving contact (5) and upper static contact (4) with the hinged connecting rod of slurcam (36); Be provided with the following valve (7) of isolating usefulness between lower moving contact (8) and the following fixed contact (20); Described down valve (7) is for slidably and be the dividing plate of " L " shape, and following valve (7) makes it with the moving up and down and slide of circuit breaker cart by special-purpose gathering sill, reaches the purpose of isolating lower moving contact (8) and following fixed contact (20).

2. side-installed shifting type high-tension switch cabinet as claimed in claim 1 is characterized in that: the dividing plate (38) for fixedly installing between bus-bar room (18) and the breaker chamber (16); Be covered with the first insulation contact box (28) that fixedly installs in the outside of upper static contact (4), described upper static contact (4) directly is connected with bus; Outside at following fixed contact (20) is covered with the second insulation contact box (19).

3. side-installed shifting type high-tension switch cabinet as claimed in claim 1 is characterized in that: described circuit breaker cart comprises circuit breaker operation mechanism (24), circuit breaker underframe (27), circuit breaker three-phase pole (9) and handcart underframe (39).

4. side-installed shifting type high-tension switch cabinet as claimed in claim 1 is characterized in that: the insulating cylinder (21) that is covered with the top end face that is fixedly installed on current transformer (22) at the following fixed contact (4) and the connecting portion of current transformer (22).

5. side-installed shifting type high-tension switch cabinet as claimed in claim 1, it is characterized in that: handcart carriage (30) both sides are provided with the guide plate (10) that is fixed on the shell (1), offer gathering sill (33) on the guide plate (10), the sidewall of handcart carriage (30) is provided with the axis of guide (34) that inserts in the gathering sill (33), and gathering sill (33) can only move up and down handcart carriage (30) by the axis of guide (34).

6. side-installed shifting type high-tension switch cabinet as claimed in claim 1, it is characterized in that: utilize the observation window that is installed on the breaker chamber Qianmen (25) to watch the isolation fracture of main contact, circuit breaker cart is when the test isolated location, automatically isolate charged upper and lower fixed contact (4,20) with the valve of circuit breaker cart motion interlock, under the prerequisite that does not change transmission direction, but the earthed switch that direct control is vertically arranged.

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