CN110768109A - A detachable isolated fracture busbar - Google Patents

Abstract

The invention discloses a detachable isolated fracture bus bar, which comprises a shell; the shell is T-shaped, and its upper and lower ends are provided with openings; Inflatable holes and hand holes are opened on the side walls; upper conductors, middle conductors, contact conductors and lower conductors are arranged in order from top to bottom between the upper insulating pot and the lower insulating pot; the upper conductor, the middle conductor, the contact conductor and the lower conductor are arranged in order. The conductors are coaxial, the upper conductor and the middle conductor are provided with a hole I for accommodating the contact conductor, one end of the contact conductor is located in the hole I, and the contact conductor can move up and down along the opening direction of the hole I to realize the conduction and disconnection of the busbar open. The detachable isolated fracture busbar of the invention has low maintenance cost, low cost, convenient operation and high disassembly efficiency, and has great application prospect.

Description

A detachable isolated fracture busbar

technical field

The invention belongs to the technical field of high-voltage power, and relates to a high-voltage switchgear in a high-voltage power system, in particular to a detachable device for connecting a gas-insulated metal-enclosed switchgear (GIS) with a voltage transformer (VT) and a lightning arrester (LA). Isolate the fractured bus.

Background technique

GIS (Gas Insulated metal-enclosed Switchgear, SF6 gas-insulated metal-enclosed switchgear) has been widely used in substations in recent years due to its compact structure, small footprint, strong environmental tolerance, safe operation, and beautiful appearance. application. The electrical organic combination is realized between the various compartments through the main busbar, and the measurement and maintenance intervals are also widely used.

At present, after the GIS site installation or maintenance, the insulation test is carried out in the following two forms:

(1) Do not install VT and LA first, and then install VT and LA after the test is completed, so that the assembly workload increases;

(2) VT and LA have their own isolation devices, such as a three-phase arrester with isolation devices disclosed in CN 207149447U, which makes the first isolation device, the second isolation device and the third isolation device rotate synchronously through the rotation of the transmission assembly , so that the first arrester, the second arrester and the third arrester can realize the conduction and isolation state synchronously. CN 208820348U discloses a three-phase common box with isolation fractured tank arrester, which is provided with a linkage structure, which solves the problem of fully enclosed combination. The technical problem of the arrester withstand voltage test in electrical appliances, but because the arrester has its own isolation device, the foreign objects dropped when the transmission component is in action will affect the insulation performance of the arrester, and the transmission component has life requirements, so it needs to be replaced together with the arrester. Maintenance costs are high.

Therefore, it is of great practical significance to develop a busbar device for isolation of GIS and voltage transformer or arrester, which is easy to operate and has high disassembly efficiency.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the defects of high maintenance cost, complicated operation steps, low work efficiency and high use cost of the VT/LA self-contained isolation device in the prior art, and provide a GIS and GIS with low cost, convenient operation and high disassembly efficiency. Busbar arrangement for connection of voltage transformers or arresters. Using the detachable isolated fracture busbar of the present invention, after the installation or maintenance of the GIS is completed, it is not necessary to remove the VT (voltage transformer) and the LA (lightning arrester) during the insulation test, and there is no need to connect the GIS with the VT and LA. There is no direct impact on the arrester when the transmission components are actuated or abnormal, and only by adjusting the position of the contact conductors in the busbar of the detachable isolation fracture, it is convenient to realize GIS and VT or turn-on or turn-off between LAs.

To achieve the above object, the present invention provides the following technical solutions:

A detachable isolated fracture busbar, comprising a casing;

The casing is T-shaped, and its upper and lower ends are provided with openings, the upper and lower end openings are respectively provided with an upper insulating basin and a lower insulating basin, and the side wall of the casing is provided with an inflatable hole and a hand hole;

The upper conductor, the middle conductor, the contact conductor and the lower conductor are arranged in sequence from top to bottom between the upper insulating pot and the lower insulating pot; the upper conductor, the middle conductor, the contact conductor and the lower conductor are coaxial, and the upper conductor A hole I for accommodating the contact conductor is opened in the conductor and the intermediate conductor, one end of the contact conductor is located in the hole I, and the contact conductor can move up and down along the opening direction of the hole I to realize the conduction and disconnection of the busbar.

After the detachable isolation fracture busbar of the present invention is installed or repaired on the GIS site, when the insulation test is performed, it is not necessary to remove the VT and LA, and there is no need to add an isolation switch or a built-in isolation device between the GIS and the VT and LA. The on and off of the line can be realized, and the parts used in the two states of the detachable isolated fracture busbar of the present invention (the line on state and the line off state) are completely the same, no other spare parts need to be prepared, and it is an independent air chamber , The installation, maintenance and test are convenient and fast, and the cost is better.

The contact conductor of the detachable isolated fracture busbar of the present invention adopts a movable design, and the holes I opened in the upper conductor and the middle conductor enable the contact conductor to move, that is, to conduct or disconnect the middle conductor and the lower conductor. The operator can adjust the contact conductor by extending into the housing through the hand hole, the operation is convenient, the cost is low, the use convenience is good, and the utility model has great application prospect.

As the preferred technical solution:

In a detachable isolated fracture busbar as described above, a gauge valve is installed on the inflatable hole, and the SF6 gas in the casing is recovered through the gauge valve or the casing is filled with SF6 gas.

In the above-mentioned detachable isolated fracture busbar, the hand hole is provided with a molecular sieve cover plate (a cover plate that can be installed with a molecular sieve) to isolate the communication between the shell and the outside world.

In the above-mentioned detachable isolated fracture bus bar, the upper conductor is fixedly connected with the upper insulating basin, and the upper conductor outer cover has an upper shielding cover connected with the upper conductor.

A detachable isolated fracture busbar as described above, the upper end of the lower conductor is provided with a blind hole II matching the contact conductor, which is used to fix the contact conductor and avoid the contact conductor and the lower conductor in the conduction state. In case of accidental separation, the lower conductor is fixedly connected with the lower insulating basin through the transition conductor, and the lower conductor outer cover has a lower shielding cover connected with the lower conductor. The protection scope of the present invention is not limited to this, and the lower conductor can also be directly and fixedly connected to the lower insulating pot.

A detachable isolated fracture busbar as described above, the intermediate conductor outer cover has an intermediate shielding cover connected with the intermediate conductor, the intermediate conductor and the lower conductor are respectively provided with spring contacts, and the spring contacts have a pair of contact conductors. A certain clamping force is required to fix it to prevent accidental detachment of the contact conductor. At the same time, the spring contact acts as a conductive connection and transmits the GIS voltage to the PT/LA.

A detachable isolated fracture busbar as described above, the hole I includes a blind hole III of the upper conductor and a through hole IV of the middle conductor, the blind hole III and the through hole IV are communicated with each other and are coaxial, and the blind hole III The inner diameter is larger than the inner diameter of the through hole IV. The specific form of the hole I of the present invention is not limited to this, and those skilled in the art can adjust it according to the actual situation.

In the above-mentioned detachable isolated fracture bus bar, the blind hole III, the through hole IV and the blind hole II are coaxial.

In the above-mentioned detachable isolated fracture busbar, the connection refers to fixed connection or welding through bolts. The specific connection form of the present invention is not limited to this, and those skilled in the art can adjust the connection form according to actual needs, and forms such as riveting can also be applied to the present invention.

A detachable isolated fracture busbar as described above, the hole I can completely accommodate the contact conductor; the lower part of the intermediate conductor is provided with a transverse through hole, and the transverse through hole is provided with a shaft pin, and the shaft pin is controlled by the control shaft pin. The position of the contact conductor can be fixed. The contact conductor is completely received into the hole I. At this time, the shaft pin is inserted into the horizontal through hole. The shaft pin blocks the contact conductor and the contact conductor can be fixed in the hole I to disconnect the contact conductor from the lower conductor (removable). Isolation break bus is open). The scope of protection of the present invention is not limited to this, and other methods can be used to fix (limit) the position of the contact conductors. Only one feasible solution is listed here, and those skilled in the art can design appropriate fixing (limitation) according to the actual situation. bit) structure.

Beneficial effects:

(1) A detachable isolated fracture busbar of the present invention is not completely fixed with other components (VT/LA), when the VT/LA is damaged, it does not need to be replaced together, and the maintenance cost is low;

(2) The detachable isolated fracture bus bar of the present invention has the advantages of low cost, convenient operation, high disassembly efficiency and great application prospect.

Description of drawings

Fig. 1 is the schematic diagram of the normal operation state of the detachable isolation fracture busbar of the present invention;

Fig. 2 is the schematic diagram of the field test state of the detachable isolated fracture busbar of the present invention;

Among them, 1-shell, 21-upper insulating pot, 22-lower insulating pot, 3-upper shield, 4-upper conductor, 5-intermediate conductor, 6-intermediate shield, 7-shaft pin, 8-spring contact Head, 9-contact conductor, 10-molecular sieve cover, 11-transition conductor, 12-lower shield, 13-lower conductor, 14-gauge valve, 15-hole I, 151-blind hole III, 152-through hole IV, 16-Blind Via II.

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

A detachable isolated fracture bus, as shown in Figure 1, includes a casing 1;

The shell 1 is T-shaped, and its upper and lower ends are provided with openings, the upper and lower end openings are respectively provided with an upper insulating basin 21 and a lower insulating basin 22, and the side wall of the casing is provided with an inflatable hole and a hand hole. A watch valve 14 is installed on it, and a molecular sieve cover plate 10 is installed in the hand hole;

The upper conductor 4, the middle conductor 5, the contact conductor 9, the lower conductor 13 and the transition conductor 11 are arranged in order from top to bottom between the upper insulating pot 21 and the lower insulating pot 22; the upper conductor 4, the middle conductor 5, the contact conductor 9 and the lower conductor 13 are coaxial, the upper conductor 4 is provided with a blind hole III 151, the middle conductor 5 is provided with a through hole IV 152, the blind hole III 151 is coaxial with the through hole IV 152 and communicated with each other to form a hole I15, blind hole III The inner diameter of 151 is larger than the inner diameter of through hole IV 152, one end of the contact conductor 9 is located in the hole I15, the hole I15 can completely accommodate the contact conductor 9, and the contact conductor 9 can move up and down along the opening direction of the hole I15 to realize the conduction of the busbar. on and off;

The upper conductor 4 and the upper insulating basin 21 are fixedly connected by bolts, the outer cover of the upper conductor 4 is provided with an upper shielding cover 3 connected with the upper conductor bolts, the lower part of the middle conductor 5 is provided with a transverse through hole, and the transverse through hole is provided with a shaft pin 7, The position of the contact conductor can be fixed by controlling the shaft pin. The intermediate conductor 5 is covered with an intermediate shield 6 that is bolted to the intermediate conductor 5. The transition conductor 11 and the lower insulating basin 22 are fixedly connected by bolts. The lower conductor 13 is covered with The lower shield 12 to which the lower conductor 13 is bolted, the upper end of the lower conductor 13 is provided with a blind hole II 16 matched with the contact conductor 9, the middle conductor 5 and the lower conductor 13 are respectively provided with spring contacts 8, blind holes III 151 , through hole IV 152 and blind hole II 16 are coaxial.

The disassembly steps of the detachable isolated fracture busbar of the present invention are as follows (the following operations are all performed from the hand hole in the side wall of the casing):

1) Recover the SF6 gas in the busbar shell of the detachable isolation fracture through the meter valve;

2) Remove the molecular sieve cover 10, unscrew the fastening screws of the intermediate shield 6, and push down the intermediate shield 6;

3) Remove the fixing screw on the right side of the shaft pin 7, move the shaft pin 7 to the left, and hold the contact conductor 9 by hand;

4) Move the contact conductor 9 upwards slowly (pay attention to observe the mounting hole on the lower side of the contact conductor 9) to a suitable position, move the shaft pin 7 to the right to fix the contact conductor 9 through the mounting hole, and then install the middle shield 6. Seal the molecular sieve cover plate 10 and fill it with SF6 gas. At this time, the detachable isolated fracture busbar is shown in Figure 2, and the GIS field insulation test can be carried out.

The installation steps of the detachable isolated fracture bus bar of the present invention are opposite to the above-mentioned removal steps.

It has been verified that the detachable isolated fracture bus bar of the present invention is not completely fixed with other components (VT/LA), and when the VT/LA is damaged, it does not need to be replaced together, and the maintenance cost is low; Very promising application.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples, and various changes may be made to these embodiments without departing from the principle and essence of the present invention. Revise.

Claims (10)

1. A detachable isolated fracture bus is characterized by comprising a shell;

the shell is T-shaped, the upper end and the lower end of the shell are provided with openings, the upper end opening and the lower end opening are respectively provided with an upper insulating basin and a lower insulating basin, and the side wall of the shell is provided with an inflation hole and a hand hole;

an upper conductor, a middle conductor, a contact conductor and a lower conductor are sequentially arranged between the upper insulating basin and the lower insulating basin from top to bottom; the upper conductor, the middle conductor, the contact conductor and the lower conductor are coaxial, a hole I for accommodating the contact conductor is formed in the upper conductor and the middle conductor, one end of the contact conductor is located in the hole I, and the contact conductor can move up and down along the opening direction of the hole I to achieve the conduction and disconnection of a bus.

2. The detachable isolating fracture busbar of claim 1, wherein said inflation port is fitted with a gauge valve.

3. The detachable isolated fracture busbar of claim 1, wherein said hand hole is fitted with a molecular sieve cover plate.

4. The detachable isolated fracture bus of claim 1, wherein the upper conductor is fixedly connected to the upper insulating basin, and the upper conductor is covered by an upper shield connected to the upper conductor.

5. The detachable isolating fracture bus according to claim 4, wherein the upper end of the lower conductor is provided with a blind hole II matched with the contact conductor, the lower conductor is fixedly connected with the lower insulating basin through a transition conductor, and a lower shielding cover connected with the lower conductor is covered on the lower conductor.

6. A detachable isolated fracture busbar according to claim 5, wherein said intermediate conductor is externally covered with an intermediate shield connected to said intermediate conductor, and said intermediate conductor and said lower conductor are provided with spring contacts therein, respectively.

7. The detachable isolating fracture busbar according to claim 5, wherein said hole I comprises a blind hole III of the upper conductor and a through hole IV of the intermediate conductor, said blind hole III and through hole IV being in communication and coaxial with each other, the inner diameter of the blind hole III being greater than the inner diameter of the through hole IV.

8. The detachable isolating fracture busbar according to claim 7, wherein said blind hole III, through hole IV and blind hole II are coaxial.

9. The detachable isolated fracture busbar of claim 8, wherein said connection is by bolting or welding.

10. The detachable isolating fracture busbar of claim 1, wherein said hole I is capable of fully receiving a contact conductor; the lower part of the middle conductor is provided with a transverse through hole, a shaft pin is arranged in the transverse through hole, and the position of the contact conductor can be fixed by controlling the shaft pin.

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