CN204230737U - 10kVPT switch cabinet bus lightning arrester car-mounted device - Google Patents

Abstract

The utility model discloses a vehicle-mounted device for a 10kVPT switch cabinet busbar arrester, which includes a trolley body, a lightning arrester, a moving device, a moving contact and an insulator. The connection between the insulator and the contact arm of the moving contact is provided with an insulating cover, the lightning arrester is connected with the moving contact through a copper bar, and the lower part of the trolley body is provided with a swing-in device, which is used to complete the moving contact and contact. The static contacts in the cabinet are reliably contacted or separated. The installation of the PT cabinet bus arrester vehicle-mounted device is simple, time-saving, safe and reliable, which greatly reduces the labor intensity and time of personnel, and the saved personnel are devoted to the inspection of their equipment, so that the safety of personal and power grids is guaranteed, and accidents are reduced. The occurrence rate has improved the reliability of power supply and played a positive role in the stable operation of the power grid.

Description

10kVPT switchgear bus surge arrester vehicle-mounted device

technical field

The utility model relates to a vehicle-mounted device for a 10kVPT switch cabinet busbar lightning arrester.

Background technique

At present, the 10kVPT switchgear of some large-scale user substations still has the problem that the bus arrester is directly connected to the bus. On the handcart, the busbar arrester is directly connected to the busbar. When the PT handcart is pulled out, if only the voltage transformer PT is inspected, there will be no problem. When testing the busbar arrester, it is necessary to remove the busbar arrester, which can easily lead to personal electric shock accidents. The existence of this wiring method of the bus arrester cannot be reliably closed, which is an installation violation and seriously affects the personal safety of operation and maintenance personnel.

The cause of the "8.19" personal injury accident of a power supply company: An engineering company was in the 220kV substation renovation project of a power supply company, and an electric shock accident occurred when replacing the voltage transformer of the 10kV section I busbar. Two people died on the spot and one was seriously burned; The cause of the accident was that in the 10kVPT cabinet, the voltage transformer was connected behind the trolley, but the arrester was directly connected to the busbar, as shown in Figure 1. After the trolley was pulled out, although the voltage transformer was not charged, the arrester was still charged. , In the process of replacing the voltage transformer, the operator mistakenly touched the upper wiring pile head of the charged arrester in the 10kV switchgear, resulting in the death of 2 people and the serious personal injury of 1 person. Therefore, the wiring method of the high-voltage bus surge arrester needs to be solved urgently.

Utility model content

In order to solve the deficiencies in the prior art, the utility model discloses a 10kVPT switch cabinet bus arrester vehicle-mounted device. The installation of the PT cabinet bus arrester trolley is simple, time-saving, safe and reliable, greatly reducing the labor intensity and time of personnel, saving More personnel are devoted to the patrol work of their equipment, the safety of personal and power grid is guaranteed, the accident rate is reduced, the reliability of power supply is improved, and the stable operation of the power grid has played a positive role.

In order to achieve the above object, the concrete scheme of the present utility model is as follows:

10kVPT switchgear bus arrester on-board device, including trolley body, lightning arrester, moving device, moving contact and insulator, moving device is installed under the trolley body, insulator and moving contact are installed in turn on the upper part of the trolley body; insulator and moving contact The connection between the contact arms is provided with an insulating cover, the lightning arrester is connected to the moving contact through a copper bar, and the lower part of the trolley body is provided with a swing-in device, which is used to complete the moving contact and the static contact in the cabinet. Reliable contact or separation. Dolly both sides are provided with valve to open bent plate 13, utilize valve to open bent plate 13, can push open valve when dolly is rocked in.

One end of the copper bar is fixed on the contact arm of the moving contact with a fixing bolt, and the other end is connected with the lightning arrester through a connecting bolt.

The trolley body includes a base bottom plate and a panel, and the opposite sides of the base bottom plate are provided with a first base side plate and a second base side plate with the same structure, and the base between the first base side plate and the second base side plate One side of the bottom plate is provided with a panel, and the upper part of the panel is provided with an insulator vertically fixed to the panel;

The length × width of the base bottom plate is 45cm × 65cm, the first base side plate and the second base side plate have the same structure, the length × height is 38cm × 6.5cm, the length × width of the bracket is 70cm × 4.5cm, the width of the panel and height are 62cm and 46cm respectively.

The length of the copper row is 0.3 meters, and the copper row is provided with a diameter of holes, and the bolts installed on the copper bars use M10 hexagonal sockets.

Described swing-in device comprises crank, and the jack of crank that cooperates with crank and screw rod, and described valve opening bent plate 13 is the bent plate of trolley both sides, is fixed on the side plate of trolley with two M8 bolts.

The moving device is a special steel wheel and a chassis for a switchgear trolley with a diameter of GZS1-12, with a diameter of 4 cm. The steel wheels are installed on both sides of the bottom of the chassis and fixed by bolts.

The position detection device includes a trigger, which is connected with the indicating device. The trigger is a travel switch, and the travel switch is installed on the fixed track at the bottom of the switch cabinet. The indicating device is an indicator light, and the indicating device is on the panel of the switch cabinet.

The moving contact is a moving contact of a 10kV VS1 vacuum circuit breaker.

The insulator is a ZJ-10Q insulator specially used for 10kV voltage level insulation.

The moving device has two functions, one is to move the bottom plate of the base, and the other is to trigger the travel switch and open the baffle of the moving contact when the steel wheel moves to the specified position. The baffle is divided into upper and lower parts, which are used to isolate the live parts. The vehicle-mounted device is shaken into the rear baffle and automatically separated to ensure reliable contact between the moving contact and the static contact in the cabinet.

The beneficial effects of the utility model:

The whole process of the lightning arrester vehicle-mounted device of the utility model is driven by a screw, and the operator only needs to shake the handle at a safe distance. The equipment is flexible to use and can be operated by one person under supervision.

The lightning arrester vehicle-mounted device of the utility model leads the busbar to the lightning arrester room and is reliably connected with the static contact. The bottom is reliably grounded to play the role that the arrester should play. After the vehicle-mounted device of the arrester is pushed in, it can be reliably connected to the busbar and play the role that the arrester should play. Comply with the relevant provisions of "High Voltage Switchgear and Control Equipment".

After using the vehicle-mounted device of PT cabinet busbar surge arrester, the problem of device violations has been solved, the safety foundation has been consolidated, the occurrence of personal accidents has been avoided, reliable safety guarantee has been provided for maintenance personnel, and huge safety benefits have been created.

The installation of PT cabinet bus surge arrester on-board device is simple, time-saving, safe and reliable, which greatly reduces the labor intensity and time of personnel, and the saved personnel are devoted to the inspection of their equipment, so that the safety of personal and power grids is guaranteed, and accidents are reduced. It improves the reliability of power supply and plays a positive role in the stable operation of the power grid.

Description of drawings

Fig. 1 Electrical schematic diagram of existing surge arrester installation site;

Figure 2 is a schematic diagram of the side structure of the vehicle-mounted device of the PT switchgear bus arrester of the utility model;

Fig. 3 is a structural schematic diagram of the vehicle-mounted device panel of the PT switchgear bus arrester of the utility model;

In the figure, 1. Moving contact, 2. Moving contact arm, 3. Insulating cover, 4. Insulator, 5. Copper row, 6. Steel wheel, 7. Chassis, 8. Frame, 9. Secondary plug, 10, panel, 11, handle, 12, crank jack, 13, valve opens bent plate.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail:

As shown in Figure 2-3, the 10kVPT switchgear busbar surge arrester vehicle-mounted device includes the trolley body, lightning arrester, mobile device, moving contact 1 and insulator. The mobile device is installed under the trolley body, and the insulator and The moving contact 1; the connection between the insulator and the contact arm of the moving contact 1 is provided with an insulating cover 3, the lightning arrester is connected with the moving contact 1 through a copper bar 5, and the lower part of the trolley body is provided with a swing-in device, Use the swing-in device to complete the reliable contact or separation of the moving contact 1 and the static contact in the cabinet.

One end of the copper bar 5 connected with the lightning arrester is fixed on the moving contact arm 2 with a fixing bolt, and the other end is connected with the lightning arrester through a connecting bolt. The trolley body includes a base bottom plate and a panel 10, the opposite sides of the base bottom plate are provided with a first base side plate and a second base side plate with the same structure, and the base bottom plate between the first base side plate and the second base side plate One side is provided with a panel 10, and the upper part of the panel 10 is provided with an insulator vertically fixed to the panel 10;

The length × width of the base bottom plate is 45cm × 65cm, the first base side plate and the second base side plate have the same structure, the length × height is 38cm × 6.5cm, the length × width of the support is 70cm × 4.5cm, the width of the panel 10 and The heights are 62cm and 46cm respectively.

The length of copper row 5 is 0.3 meters, and copper row is provided with diameter is holes, and the bolts installed on the copper bars use M10 hexagonal sockets. The cranking device includes a crank handle, a crank handle socket 12 matched with the crank handle, and a screw rod. A valve opening and bending plate 13 is arranged on both sides of the trolley, and is fixed on the side plate of the trolley with two M8 bolts.

Mobile device is the special steel wheel 6 and the chassis 7 of the switchgear trolley of diameter GZS1-12 type, diameter 4cm, and steel wheel 6 is installed in the position of both sides below the bottom of chassis 7, utilizes bolt to fix.

The position detection device includes a trigger, which is connected with the indicating device. The trigger is a travel switch, and the travel switch is installed on the fixed track at the bottom of the switch cabinet. The indicating device is an indicator light, and the indicating device is on the panel 10 of the switch cabinet.

The moving contact 1 is the moving contact 1 of the 10kV VS1 vacuum circuit breaker. The insulator is a ZJ-10Q insulator specially used for 10kV voltage level insulation.

Specific implementation example: Measured dimensions of the bottom space of the 10kVPT cabinet: 65.6cm wide, 65cm high, 90cm deep, the distance between the handcart tracks on both sides is 65cm, and the center point of the live part is 56cm from the ground. The busbar PT cabinet currently in operation is equipped with a PT trolley, and the lower space is narrow. The size of the vehicle-mounted device for the switchgear busbar arrester of the utility model needs to meet the following requirements: the height is less than 65 cm, the width is less than 65.6 cm, and the length is less than 62 cm due to the existence of guide grooves. cm; beyond this size, it will not be possible to shake the trolley in and out of the switch cabinet.

The trolley body of the switchgear bus surge arrester on-board device, the circuit breaker trolley, and the PT trolley are frame 8 structures with the same structure, and the frame 8 structure is made of steel plates.

Selection of lightning arrester: The 10kV busbar in the substation is used for multiple 10kV lines. The switch is a VS1 or ZN5 type vacuum switch. Due to the strong arc extinguishing ability of the vacuum switch, it will cause special operating overvoltage when it is switched off, resulting in high voltage motors. Insulation breakdown, circuit transformer failure, and even damage to the switchgear itself. Therefore, the main function of the 10kV bus arrester is to prevent operating overvoltage. There are two kinds of surge arresters that can prevent operating overvoltage: AC gapless metal oxide surge arrester (HY5WZ-10kV) and new TBP three-phase combined overvoltage protector.

Hard conductive bar (copper bar 5): easy to process and install, and easy to fix by bolts. Good rigidity, not easy to deform with the movement of the trolley.

Selection of lead screw: The layout size of the switchgear has been measured. Among them, the swing-in and swing-out stroke of the busbar surge arrester vehicle-mounted device is at most 20 cm, so the swing-in part must be flexibly and freely within the range of 20 cm to realize the busbar. Reliable connection between the moving contact 1 of the arrester trolley and the static contact in the arrester room. The screw is to convert the rotary motion into linear motion through the screw nut, and it is driven by an ordinary screw or ball screw, which can obtain high precision and smooth motion. The transmission is stable, the vibration is small, the frictional resistance moment is small, the transmission precision is high, and the transmission efficiency is high. The sliding screw nut mechanism has the advantages of simple structure, convenient processing and low manufacturing cost. long lasting. Appropriately apply lubricating grease after installation.

Electrical indication: Through the externally applied circuit, when the steel wheel 6 of the bus surge arrester trolley crushes the trigger, it is connected, and the light indicates that the trolley is in place.

Composite insulators: Composite insulators are high-voltage insulators made of silicone rubber materials. The quality will be arranged separately. The insulation performance is excellent, but the price is relatively high. It has the advantages of small mass, high strength, good stain resistance and small maintenance workload.

Working principle or working process:

The lightning arrester vehicle-mounted device is also called the lightning arrester trolley, which uses nuts and screw rods to shake and advance and withdraw. After the lightning arrester trolley is installed in the cabinet, it is in the disconnected position in the cabinet. If you want to put the trolley into operation, first put the trolley in the inspection position, and the auxiliary circuit plug should be plugged in. The moving contact 1 of the secondary plug 9 passes through a The nylon corrugated pipe is connected with the lightning arrester trolley, and the secondary static contact seat is installed on the upper right of the circuit breaker compartment of the switch cabinet. If the power is turned on, the test position indicator light on the panel 10 is on. Before remotely entering the trolley, all the cabinet doors must be closed, insert the key into the door lock hole, and lock the door. At this time, you can insert the handle of the handcart into the operation hole on the middle panel 10, turn the handle clockwise, and remotely enter the trolley. When reaching a certain position, the movable curtain will automatically open to expose the static contacts until the crank is obviously blocked and a crisp auxiliary switch switching sound is heard. At this time, the moving and static contacts are in reliable contact, and at the same time the working position indicator light on the instrument room panel 10 is on, and then Remove the crank. If you are going to withdraw the trolley from the working position, start with the trolley to operate the handle, turn it counterclockwise, and turn it to a certain position. The movable curtain will separate the dynamic and static contacts until the crank is blocked and the crisp auxiliary switch switching sound is heard, and the trolley will return to the maintenance position. At this time, the main circuit has been completely disconnected and the metal valve is closed. A handle 11 is provided on the panel 10 for holding and facilitating operation.

On-site trial: On-site trial in the 10kV bus area of 35kV Shenghong Substation. Trial results: convenient trial, easy to push and pull, high safety, after the busbar surge arrester trolley is rolled in, it can reliably seal the exposed live parts, and the staff will not stop In the case of undermining the on-site safety measures and strictly complying with the relevant safety regulations, there is no possibility of electric shock, which effectively prevents the occurrence of personal electric shock accidents.

Target inspection 1: Busbar surge arrester trolley withstand voltage strength: Carry out a power frequency withstand voltage test on the trolley, with a rated voltage of 10kV and a power frequency withstand voltage of 38kV, for a duration of 1min. It is verified by the test that it meets the requirements of the regulations. The test is qualified and meets the field application conditions.

Target inspection 2: Taking advantage of the customer's power outage maintenance operation, the team members conducted on-site use tests on the assembled high-voltage switchgear bus surge arrester trolley in the 10kV bus area of the 35kV Shenghong substation. Judging from the current use situation, the high-voltage After the trolley of the arrester for the busbar of the switchgear is pushed in, the contact with the busbar is reliable, and the indication is correct. The operator shakes it in and out quickly and efficiently. It can greatly reduce the safety threat of operation and maintenance personnel.

The vehicle-mounted device of the PT switch cabinet busbar lightning arrester of the utility model is developed according to the requirements of on-site operations. The structure is relatively simple, and the team can implement it after demonstration. The required cost is low, only 12,000 yuan. It can solve the problem of no electrification when the busbar arrester is overhauled, and it has the same operation as the PT trolley, with good safety performance.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (10)

1. 10kVPT switchgear bus arrester vehicle-mounted device, which is characterized by including trolley body, lightning arrester, mobile device, moving contact and insulator, the bottom of the trolley body is equipped with a mobile device, and the upper part of the trolley body is sequentially installed with insulators and moving contacts; The connection between the insulator and the contact arm of the moving contact is provided with an insulating cover. The lightning arrester is connected to the moving contact through a copper bar. The lower part of the trolley body is provided with a swing-in device. The static contacts in the cabinet are reliably contacted or separated. 2. The vehicle-mounted device of 10kVPT switchgear busbar surge arrester as claimed in claim 1, wherein one end of the copper bar is fixed on the contact arm of the moving contact with a fixing bolt, and the other end is connected with the arrester through a connecting bolt. 3. 10kVPT switchgear busbar surge arrester vehicle-mounted device as claimed in claim 1, it is characterized in that, described trolley body comprises base base plate and panel, and the two sides of relative arrangement of base base plate are provided with the first base side plate and the second base plate with the same structure Two base side plates, one side of the base bottom plate between the first base side plate and the second base side plate is provided with a panel, and the upper part of the panel is provided with an insulator vertically fixed to the panel. 4. The 10kVPT switchgear busbar surge arrester vehicle-mounted device as claimed in claim 3, wherein the length × width of the base bottom plate is 45cm × 65cm, the first base side plate and the second base side plate have the same structure, and the length × width is 45cm × 65cm. The height is 38cm×6.5cm, the length×width of the bracket is 70cm×4.5cm, and the width and height of the panel are 62cm and 46cm respectively. 5. 10kVPT switchgear busbar surge arrester vehicle-mounted device as claimed in claim 2, is characterized in that, the length of described copper bar is 0.3 meter, is provided with diameter on copper bar holes, and the bolts installed on the copper bars use M10 hexagonal sockets. 6. The vehicle-mounted device of 10kVPT switchgear busbar surge arrester according to claim 1, characterized in that, the cranking device comprises a crank handle, a crank handle socket and a screw rod matched with the crank handle. 7. The 10kVPT switchgear busbar surge arrester vehicle-mounted device as claimed in claim 1, wherein the mobile device is a special steel wheel and chassis for a switchgear trolley with a diameter of GZS1-12, with a diameter of 4cm, and the steel wheel is installed on the bottom of the chassis. The positions on both sides of the bottom are fixed with bolts. 8. The 10kVPT switchgear busbar surge arrester vehicle-mounted device as claimed in claim 1, wherein the vehicle-mounted device also includes a position detection device, the position detection device includes a trigger, the trigger is connected with the indicating device, and the trigger is a travel switch, and the travel distance The switch is installed on the fixed rail at the bottom of the switch cabinet, and the indicating device is an indicator light, which is on the panel of the switch cabinet. 9. The vehicle-mounted device of 10kVPT switchgear busbar surge arrester according to claim 1, wherein the moving contact is a moving contact of a 10kVVS1 vacuum circuit breaker. 10. The vehicle-mounted device of 10kVPT switchgear busbar surge arrester according to claim 1, wherein the insulator is a ZJ-10Q insulator specially used for 10kV voltage level insulation.