CN214753422U - Contact assembly for high-voltage switch equipment - Google Patents
Contact assembly for high-voltage switch equipment Download PDFInfo
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- CN214753422U CN214753422U CN202121280572.1U CN202121280572U CN214753422U CN 214753422 U CN214753422 U CN 214753422U CN 202121280572 U CN202121280572 U CN 202121280572U CN 214753422 U CN214753422 U CN 214753422U
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Abstract
The utility model belongs to the technical field of switchgear, in particular to a contact assembly for high-voltage switchgear, which comprises a fixed contact conductor, a shielding cover, an electrical contact and a contact conductor, wherein the fixed contact conductor is electrically connected with the contact conductor through the electrical contact; the shielding cover is fixed on the outer side of the electric contact, and heat dissipation holes are formed in the circumferential surface of the shielding cover along the circumferential direction. Through seting up the louvre on the shield cover, the heat that produces the electric contact department that can be quick is dispersed fast, can avoid traditional shielding to cover the heat, can only outwards dispel the heat through shield cover material itself, its heat dissipation benefit is low, current-carrying capacity requirement when can not satisfy its heavy current, after seting up the louvre, the energy that the contact point produced can in time effectively be transmitted away, satisfy large capacity switchgear's demand, specially adapted 6300A reaches above heavy current class switchgear contact assembly.
Description
Technical Field
The utility model belongs to the technical field of switchgear, especially, relate to a contact class subassembly for high tension switchgear.
Background
Within conventional switchgear, electrical contact between conductors often takes the form of contact connections. The contact structure is various, has self-operated contact, plum blossom contact, touches and indicates class structure etc. is provided with the shield cover in the contact structure outside, plays shielding contact structure, improves the electric field, improves insulating purpose, because traditional switchgear current-carrying capacity requires not highly relatively, can satisfy user's demand basically.
In recent years, with the rapid development of power grid construction and the demand of the environment-friendly society, the demands of users for miniaturized, high-parameter and high-capacity switchgear are higher, and with the implementation of major engineering construction projects such as large-scale hydropower engineering, urban and rural power grid transformation and the like, the power transmission network is continuously advancing towards high voltage, long distance, high capacity and miniaturization, so the demands for the current carrying capacity of the switchgear are gradually increased. Particularly, in the pumped storage complete switch device, the rated voltage is low, the current carrying capacity is large, the current carrying capacity is 6300A or above, and the device is particularly important for a heat dissipation structure of a main conductive circuit. When the current carrying capacity of an electric contact part of the traditional switch device is improved, one is to change the material of an inserted conductor, so that the cost is increased; secondly, the structure of the electric contact is optimized and improved, the size of the conductor structure is increased, and the contact points are increased, so that the volume of the switch equipment is increased; thirdly, under the condition of increasing the contact point, the pressure (namely, the holding force) on the electric contact is increased, the contact resistance is reduced, and if the contact conductor is used for the movable piece, the mechanism operation function is increased. In summary, the current carrying capacity is mainly improved by the above approaches, but the requirements of users on miniaturization, low cost, high reliability and environmental protection of the switch device are not met.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defect that above-mentioned prior art exists, the utility model aims to provide a contact class subassembly for high tension switchgear has solved the technical means that takes when improving the current-carrying capacity at present and has not conform to the problem that the user required to switchgear miniaturization, low-cost, high reliability and green.
The utility model discloses a realize through following technical scheme:
a contact assembly for high-voltage switch equipment comprises a fixed contact conductor, a shielding case, an electric contact and a contact conductor, wherein the fixed contact conductor is electrically connected with the contact conductor through the electric contact;
the shielding cover is fixed on the outer side of the electric contact, and a plurality of heat dissipation holes are formed in the circumferential surface of the shielding cover along the circumferential direction.
Furthermore, the radiating holes are strip-shaped holes, and the length directions of the strip-shaped holes are parallel to the axis of the electric contact.
Further, rectangular shape hole includes the rectangle hole and with two semi-circular holes of rectangle hole both ends intercommunication.
Further, the length of the heat dissipation hole is less than or equal to one half of the length of the electric contact.
Further, the distance between the adjacent edges of the adjacent heat dissipation holes is larger than or equal to 1.2 times of the wall thickness of the shielding cover.
Furthermore, one end of the shielding cover close to one side of the contact conductor adopts an inward flanging structure.
Further, one end of the electrical contact is electrically connected with the fixed contact conductor through a plurality of first electrical contact points, and the other end of the electrical contact is electrically connected with the contact conductor through a plurality of second electrical contact points;
the heat dissipation hole is disposed at an intermediate position between the first electrical contact point and the second electrical contact point.
Further, the contact manner of the contact conductor and the electrical contact adopts a fixed electrical contact or an electric contact.
Furthermore, a plurality of isolation blocks arrayed along the circumference are arranged on the inner wall of the shielding cover, the isolation blocks and the heat dissipation holes are arranged in a staggered mode, and an area formed by two adjacent isolation blocks is used for assembling a contact finger assembly of the electric contact.
Further, the distance between the fixed ends of two adjacent isolating blocks is recorded as H1, the distance between the free ends of two adjacent isolating blocks is recorded as H2, and H1-H2 is less than or equal to 2.5 mm.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a contact class subassembly for high tension switchgear, through set up the louvre on the shield cover, the heat that produces the electrical contact point department that can be quick is effluvium fast, can avoid traditional shielding to cover the heat, can only cover outside heat dissipation through shield cover material itself, its heat dissipation benefit is low, current-carrying capacity requirement when can not satisfy its heavy current, after set up the louvre, the heat-conduction mode at here is mainly natural convection heat transfer, and the efficiency of convection heat transfer is than passing through material heat transfer itself, thermal radiation all will be high, therefore the energy that this contact point produced can in time effectively transmit away, satisfy large capacity switchgear's demand. The utility model discloses an improve electric contact part's heat transfer ability and arrangement structure and improve the current-carrying ability, accord with the requirement to switchgear miniaturization, low cost, satisfy the requirement of current-carrying ability 6300A and above, specially adapted 6300A and above big current class switchgear class contact subassembly.
Furthermore, the radiating holes are strip-shaped holes, the horizontal axis direction of the radiating holes is horizontally arranged with the axis of the shielding case, and the direction of the current path is kept consistent when the radiating holes bear current, so that the radiating holes are favorable for quick heat exchange and quick heat radiation.
Further, rectangular shape hole includes the rectangular hole and compares with two semicircular holes of rectangular hole both ends intercommunication, compares with the short-length hole, can guarantee at the radiating process, prevents that the heat gathering from more doing benefit to thermal effluvium around the rectangular hole, can guarantee the homogeneity of electric field on the shield cover simultaneously.
Further, through research and design, the length direction of the heat dissipation holes is not more than half of the length of the electric contact, and the distance between two adjacent edges of the adjacent heat dissipation holes is not less than 1.2 times of the wall thickness of the shielding cover, so that the overall strength of the shielding cover is not influenced.
Furthermore, the end of the shielding cover close to one side of the contact conductor adopts a tail flanging structure, so that one end of the electric contact can be fixed.
Furthermore, when the contact conductor is in a movable contact structure, the requirement on the operation function of the mechanism is small, the safe and reliable operation of a product can be effectively improved, and the requirements on miniaturization, high parameter, low cost and high reliability of the switch equipment are met.
Furthermore, the inside spacer block that sets up of shield cover, the spacer block can prevent each heat mutual transmission and the influence each other between the contact subassembly of organizing, plays certain heat absorption and quick radiating effect simultaneously.
Further, the difference between the assembling sizes H1 and H2 of the electrical contact finger assembly is not more than 2.5mm, if the gap is too large, the interval between the pieces after the electrical contact finger contact piece is assembled is too large, the electrical contact is excessively inclined, the electrical contact point is in poor contact with a contact conductor, the resistance is increased, and the heating is fast; meanwhile, when the contact conductor is used as a movable contact structure, the friction is increased, metal particles are easily generated, the discharge phenomenon is caused, and the safe and reliable operation of the switch device cannot be ensured.
Drawings
Fig. 1 is an external structural schematic view of a contact assembly for high-voltage switchgear according to the present invention;
fig. 2 is a schematic view of the internal structure of the contact assembly for high-voltage switchgear according to the present invention;
fig. 3 is a schematic structural diagram of the shielding case of the present invention;
FIG. 4 is a schematic cross-sectional view of FIG. 3;
FIG. 5 is a schematic longitudinal sectional view of FIG. 3;
fig. 6 is a schematic view of an assembly structure of the contact assembly and the shield case of the present invention.
Wherein: the device comprises a fixed contact conductor 1, a shielding case 2, a first electric contact point 3, a heat dissipation hole 4, an electric contact 5, a second electric contact point 6, a contact conductor 7, an isolation block 8, a screw hole 9 and an electric contact fixing end 10.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
as shown in fig. 1 to 3, the utility model discloses a contact assembly for high-capacity high-voltage switchgear, which comprises a fixed contact conductor 1, a shielding case 2, an electrical contact 5 and a contact conductor 7, wherein the fixed contact conductor 1 is electrically connected with the contact conductor 7 through the electrical contact 5; the shielding case 2 is fixed outside the electrical contact 5, and heat dissipation holes 4 are arranged on the circumferential surface of the shielding case 2 along the circumferential direction.
The fixed contact conductor 1, the electrical contact 5 and the contact conductor 7 form a main circuit, i.e. a main circuit conducting path, via the electrical contact points, which serves to carry the current. Specifically, one end of the electrical contact 5 is electrically connected to the fixed contact conductor 1 through a plurality of first electrical contact points 3, and the other end of the electrical contact 5 is electrically connected to the contact conductor 7 through a plurality of second electrical contact points 6.
The electric contact 5 is connected with the fixed contact conductor 1 together by screw thread fixing, screw fixing or adopting the mode of fixing the shielding cover 2 and the like; while the electrical contact 5 forms a first electrical contact point 3 after being connected to the fixed contact conductor 1.
The shield case 2 is connected to the fixed contact conductor 1 to improve the electric field of the electrical contact 5, and the shield case 2 may be connected to the fixed contact conductor 1 by means of screw fastening, screwing, and thermal compression.
The shielding case 2 can be processed by adopting an integral spinning process, a casting process or a machining process and other process methods; the circumferential surface of the shielding case 2 is uniformly provided with heat dissipation holes 4 along the circumferential direction, the main structure of the shielding case 2 is not changed, and the arranged heat dissipation holes 4 do not influence the surface field intensity of the electric contact 5.
The heat dissipation hole 4 is arranged in parallel with the electric contact 5, the fixed contact conductor 1, the contact conductor 7, and the like along the axis.
The electrical contact 5 mainly comprises a self-force contact, a plum blossom contact, a contact finger and the like.
The size and the shape of the heat dissipation holes 4 are related to the electrical contact 5, for the contact finger type structure, because the contact fingers are in close contact, 5-8 contact fingers are used as a group, and the heat dissipation holes 4 are arranged outside each group of contact fingers; for the self-force contact and the tulip contact, a heat dissipation hole 4 is arranged in the middle of 2 contact fingers, and the position of the heat dissipation hole is crossed with the position of the contact fingers. When the current is carried, the heat of the electric contact point can be quickly transferred out through the heat dissipation holes 4 to exchange heat with the outside cold gas, so that the temperature rise of the electric contact point is reduced, and the requirement of a temperature rise value specified by a standard is met.
The heat dissipation holes 4 are elongated holes, the horizontal axis direction of the heat dissipation holes is horizontally arranged with the axis of the shielding case 2, and the direction of the current path is consistent with that of the current path when the heat dissipation holes bear current, so that the heat dissipation holes are favorable for rapid heat exchange, and the heat dissipation holes 4 are basically arranged in the middle positions of the first electric contact points 3 and the second electric contact points 6.
Preferably, through design research, the length direction of the heat dissipation hole 4 is not more than one half of the length of the electrical contact 5; the distance between two adjacent edges of adjacent heat dissipation holes 4 cannot be less than 1.2 times of the wall thickness of the shielding case 2, so as not to affect the overall strength of the shielding case 2.
As shown in fig. 3, the heat dissipation hole 4 is generally a circle, the center connection line of the heat dissipation hole on the circle is circular, which can basically reduce the heat generated at the electrical contact point, and meet the requirement of the temperature rise value specified by the standard, but for 6300A and above large current, because the current is large, the generated heat is more, in order to quickly dissipate the heat, the heat dissipation hole 4 can be a plurality of circles, the size of the heat dissipation hole 4 is determined according to the specific structure size, so that the heat generated at the electrical contact point can be more quickly dissipated along the heat dissipation hole 4, and exchanges heat with the external cold gas, so as to meet the requirement of large current.
The heat dissipation holes 4 are formed in the shielding case 2, and the heat conduction mode of the switchgear during current bearing is changed according to the path of the current bearing of the main loop, so that the natural convection conduction plays a main role in the heat conduction process, the heat transfer efficiency can be effectively improved, and the generated heat is timely transferred to the outside of the high-voltage switchgear.
The contact conductor 7 can adopt a fixed electric contact structure or a movable electric contact structure, and the opening and closing operation is carried out through the contact conductor 7. The movable contact structure is adopted, the requirement on the operating power of the mechanism is small, the safe and reliable operation of the product can be effectively improved, and the requirements of miniaturization, high parameter, low cost and high reliability of the switch equipment are met.
As shown in fig. 3, rectangular shape hole includes the rectangular hole and with two semicircular holes of rectangular hole both ends intercommunication, 2 sides are semicircular hole to carry out the radius angle in the course of working and handle, wherein 2 sides are semicircular hole, compare with the short-length hole and can guarantee in the radiating process, prevent that the heat gathering is around the rectangular hole, more do benefit to thermal effluvium, can guarantee the homogeneity of electric field on the shield cover simultaneously.
Preferably, as shown in fig. 3, a plurality of circumferentially arrayed isolation blocks 8 are arranged on the inner wall of the shielding case 2, the isolation blocks 8 are arranged in a staggered manner with the heat dissipation holes, and the region formed by two adjacent isolation blocks 8 is used for assembling a contact finger assembly of an electrical contact. The isolation block 8 is used for isolating each group of electrical contact finger assemblies, so that heat among the electrical contact finger assemblies can be prevented from being mutually transferred and influenced when a large-current test is carried out, and excessive concentration of heat generation is avoided; meanwhile, the isolation block 8 can also play a certain role in heat absorption and rapid heat dissipation, and is more favorable for application of the switch equipment under large current.
As shown in fig. 6, every 5-10 pieces of the electrical contacts 5 are used as a group, and each group is isolated by the electrical contact isolation block 8, so that sufficient holding force and relative heat dissipation between the electrical contacts 5 can be ensured.
As shown in fig. 4, the distance between the fixed ends of two adjacent spacers 8 is H1, the distance between the free ends of two adjacent spacers 8 is H2, and the electrical contacts 5 are assembled in the middle of two adjacent spacers 8 by every 5-10 pieces, wherein H1-H2 are no more than 2.5mm, if the gap is too large, the distance between the pieces after the electrical contact finger assembly is assembled is too large, which will cause the electrical contact 5 to be excessively inclined, the second electrical contact point 6 will be changed from line contact to point contact with the contact conductor 7, and the poor contact will increase the resistance and generate heat quickly; meanwhile, when the contact conductor 7 is used as a movable electric contact structure, the friction is increased, metal particles are easily generated, the discharge phenomenon is caused, and the safe and reliable operation of the switch device cannot be ensured.
As shown in fig. 5, the electrical contact fixing end 10 on the side close to the contact conductor 7 adopts an inverted structure for fixing one end of the electrical contact 5; the number of the screw holes 9 is the same as that of each group of the electric contacts 5, and after the electric contacts 5 and the shielding case are assembled, the screw holes 9 are used for assembling with the fixed contact conductor 1.
To sum up, the utility model provides a large capacity is contact subassembly for high tension switchgear, through set up louvre 4 on shield casing 2, can be fast to the heat that the electric contact department produced spill fast, can avoid traditional shielding to cover the heat, can only outwards dispel the heat through shield casing 2 material itself, its radiating benefit is low, can not satisfy the current-carrying capacity requirement when its heavy current, after set up louvre 4, the heat conduction mode at here is mainly natural convection heat transfer, and the efficiency of convection heat transfer is higher than through the heat transfer of material itself, thermal radiation, therefore the energy that this contact point produced can effectively be transmitted away in time; meanwhile, the isolation block 8 is adopted in the middle of the adjacent electrical contact finger assemblies for isolation, heat can be prevented from being concentrated in an over-center mode, the isolation block 8 plays a role in absorbing heat and dissipating heat quickly, the requirements of high-capacity switch equipment are met, and the high-capacity switch device is particularly suitable for contact assemblies of high-current switch equipment of 6300A and above.
Claims (10)
1. A contact assembly for high-voltage switch equipment is characterized by comprising a fixed contact conductor (1), a shielding case (2), an electric contact (5) and a contact conductor (7), wherein the fixed contact conductor (1) is electrically connected with the contact conductor (7) through the electric contact (5);
the shielding case (2) is fixed on the outer side of the electric contact (5), and a plurality of heat dissipation holes (4) are formed in the circumferential surface of the shielding case (2) along the circumferential direction.
2. Contact assembly for high voltage switchgear according to claim 1, characterized in that the heat dissipation aperture (4) is an elongated aperture, the length direction of which is arranged parallel to the axis of the electrical contact.
3. The contact assembly of claim 2, wherein the elongated hole comprises a rectangular hole and two semi-circular holes communicating with two ends of the rectangular hole.
4. Contact assembly for a high-voltage switchgear, according to claim 1, characterized in that the length of the heat dissipation aperture (4) is less than or equal to half the length of the electrical contact (5).
5. Contact assembly according to claim 1, wherein the distance between adjacent edges of adjacent heat dissipation apertures (4) is equal to or greater than 1.2 times the wall thickness of the shielding enclosure (2).
6. Contact assembly according to claim 1, characterised in that the shield (2) is turned inwards on the side close to the contact conductor (7).
7. Contact assembly of the type for high-voltage switchgear, according to claim 1, characterized in that the electrical contact (5) is electrically connected at one end to the fixed contact conductor (1) via a plurality of first electrical contact points (3) and at the other end to the contact conductor (7) via a plurality of second electrical contact points (6);
the heat dissipation hole (4) is arranged at an intermediate position between the first electrical contact point (3) and the second electrical contact point (6).
8. Contact assembly of the type for high-voltage switchgear according to claim 1, characterized in that the contact conductor (7) is in fixed electrical or galvanic contact with the electrical contact (5).
9. The contact assembly for the high-voltage switch equipment according to any one of claims 1 to 8, wherein a plurality of isolation blocks (8) arrayed along the circumference are arranged on the inner wall of the shielding case (2), the isolation blocks (8) and the heat dissipation holes are arranged in a staggered manner, and an area formed by two adjacent isolation blocks (8) is used for assembling a contact finger assembly of an electrical contact.
10. The contact assembly for high-voltage switchgear according to claim 9, wherein the distance between the fixed ends of two adjacent spacers (8) is designated as H1, the distance between the free ends of two adjacent spacers (8) is designated as H2, and H1-H2 is 2.5mm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121280572.1U CN214753422U (en) | 2021-06-08 | 2021-06-08 | Contact assembly for high-voltage switch equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121280572.1U CN214753422U (en) | 2021-06-08 | 2021-06-08 | Contact assembly for high-voltage switch equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214753422U true CN214753422U (en) | 2021-11-16 |
Family
ID=78628972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121280572.1U Active CN214753422U (en) | 2021-06-08 | 2021-06-08 | Contact assembly for high-voltage switch equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214753422U (en) |
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2021
- 2021-06-08 CN CN202121280572.1U patent/CN214753422U/en active Active
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