CN214850062U - 40.5KV withdrawable high-voltage switch cabinet in high-altitude environment - Google Patents

Abstract

The utility model discloses a 40.5KV under high altitude environment moves away formula high tension switchgear, including preceding shell, cubical switchboard body, supporting insulator, preceding shell rotates with the cubical switchboard body to be connected, preceding shell inner wall is provided with circuit breaker handcart room, instrument room, circuit breaker handcart room sets up the inboard position that just is close to the lower wall of shell in the front, the instrument room sets up in circuit breaker handcart room top, the utility model discloses, the external insulation strength margin is enough big, has satisfied the external insulation strength decline that high altitude air tightness descends and causes and carries out the requirement of revising, and the insulating material-the fine reinforcing epoxy of glass that the supporting insulator material chooseing for use is influenced by the difference in temperature not big and the ageing-resistant degree is high is guaranteed that high strength is in the time, and deflection and ageing degree are all less, have adapted to insulating complex requirement under the high altitude condition, generally speaking the utility model provides a use safety under being applied to high altitude environment, High-voltage switchgear which operates reliably.

Description

40.5KV withdrawable high-voltage switch cabinet in high-altitude environment

Technical Field

The utility model relates to a high tension switchgear technical field especially relates to a 40.5KV under high altitude environment moves away formula high tension switchgear.

Background

With the rapid development of national industry and the continuous acceleration of western large development process, more and more high-voltage electrical equipment is widely applied in western high-altitude areas, and the increase of the altitude greatly distinguishes the design, manufacture, installation and use of the high-voltage electrical equipment from plain areas. How to make the high-voltage switch cabinet break through the limitation of the altitude is a problem to be solved by various electrical complete factories and element manufacturers.

In high altitude areas, due to high altitude, low air density and temperature, large day and night temperature change, small absolute air humidity, more annual weathers and less precipitation, the severe natural climate conditions mainly have the following four influences on the performance of electrical equipment:

(ii) influence of air pressure and air density reduction

1) Influence on the strength of the insulating medium

A decrease in air pressure or air density causes a decrease in the strength of the external insulation. Within the range of the altitude of 5000m, the height is 1000m per liter, namely, the external insulation strength is reduced by 8-13% when the average air pressure is reduced by 7.7-10.5 kPa.

2) Influence on the breakdown voltage of the electrical gap

For a designed and shaped product, as the electric clearance is fixed, the breakdown voltage is reduced along with the reduction of air pressure, and in order to ensure that the product has enough breakdown resistance when used in a plateau environment, the electric clearance must be increased. The electrical clearance of high altitude electrical products can be corrected by a 10% increase per 1000 meters increase in altitude.

3) Influence on corona and discharge voltage

a. The high altitude and low air pressure reduces the partial discharge initial voltage of the high voltage motor, the corona initial voltage is reduced, and the corona corrosion is serious;

b. the high altitude and low air pressure causes the air pressure in the power capacitor to be reduced, so that the initial voltage of partial discharge is reduced;

c. the high altitude and low pressure reduces the voltage of the inner cavity of the lightning arrester, resulting in the reduction of power frequency discharge voltage.

4) Influence on arc extinguishing performance of switch electric appliance

The reduction of air pressure or air density reduces the arc extinguishing performance of the switching device for air medium arc extinguishing, reduces the on-off capacity and shortens the electric service life.

5) Influence on the cooling effect of the medium, i.e. the rise in temperature of the product

A reduction in air pressure or air density causes a reduction in the cooling effect of the air medium. For electrical products that use natural convection, forced air, or air radiators as the primary heat dissipation means, the temperature rise increases due to the reduction in heat dissipation capacity. Within the range of the altitude of 5000m, the elevation per liter is 1000m, namely, every time the average air pressure is reduced by 7.7-10.5 kPa, the temperature rise is increased by 3% -10%.

6) Influence on mechanical structure and sealing of product

a. Cause changes in the physical and chemical properties of low density, low concentration, porous materials (e.g., electrical insulation, thermal insulation, etc.);

b. the evaporation of the lubricant and the volatilization acceleration of the plasticizer in the plastic product;

c. due to the increase of the internal and external pressure difference, gas or liquid is easy to leak from the sealed container or the leak rate is increased, and the electrical performance is indirectly influenced by the electrical product with the sealing requirement;

d. causing a change in the pressure to which the pressurized container is subjected, resulting in the pressurized container being susceptible to rupture.

(II) influence of decrease in air temperature and increase in temperature change (including daily temperature difference)

1) Compensation of plateau ambient air temperature to product temperature rise

Both the average air temperature and the maximum air temperature decrease with increasing altitude, and the thermal aging life of electrical insulation is determined by the average air temperature. The reduction of the temperature of the plateau environment air can partially or completely compensate the increase of the temperature rise of the electrical product in the operation process caused by the reduction of the air pressure.

2) Influence of daily temperature difference or temperature change on product structure

The daily temperature difference of the plateau air temperature is large. The large temperature change makes the product shell easy to deform and crack, and the sealing structure is easy to break. Such as epoxy resin casting products in high-voltage switch cabinets.

(III) influence of air absolute humidity reduction

Influence of absolute humidity on external insulation strength

The average absolute humidity decreases with increasing altitude. When the absolute humidity is reduced, the external insulation strength of the electrical product is reduced, so that the humidity correction of the power frequency discharge voltage and the impact flashover voltage is considered.

(IV) illuminance by solar radiation, including the influence of increased illuminance by ultraviolet radiation

1) Effect of elevated heat radiation

The maximum solar radiation degree at the altitude of 5000m is 1.25 times of the corresponding value at the low altitude, and the heat radiation heats the object. For outdoor electrical products, the increase of solar heat radiation causes larger additional temperature rise on the surface, reduces the material performance of the organic insulating material, deforms the material, and generates the influence of mechanical thermal stress and the like.

2) Increased effect of plateau UV radiation

The increasing rate of the ultraviolet radiation illumination along with the elevation is much larger than that of the total solar radiation illumination, and reaches 2 times of the corresponding value at low elevation when the elevation is 3000 m. Ultraviolet rays cause accelerated aging of the organic insulating material, making air easily ionized to cause a decrease in external insulation strength and corona onset voltage.

The use environment is limited to the condition that the altitude of the high-voltage electrical equipment is below 1000 meters according to the national technical standard, so that the existing electrical complete equipment cannot well meet the requirements of safe use and reliable and stable operation of the electrical equipment in the high-altitude area.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a 40.5KV movable high-voltage switch cabinet under high altitude environment.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a40.5 KV movable high-voltage switch cabinet in a high-altitude environment comprises a front shell, a switch cabinet body and a supporting insulator, wherein the front shell is rotatably connected with the switch cabinet body, a breaker handcart chamber and an instrument chamber are arranged on the inner wall of the front shell, the breaker handcart chamber is arranged at the inner side of the front shell and is close to the lower wall, the instrument chamber is arranged above the breaker handcart chamber, a bus chamber and a cable chamber are arranged on the inner side of the switch cabinet body from top to bottom, partition plates are fixedly connected among the breaker handcart chamber, the bus chamber, the cable chamber and the instrument chamber, primary equipment is arranged on the inner sides of the breaker handcart chamber, the bus chamber and the cable chamber and comprises a current-voltage transformer, a zero-sequence current transformer, a vacuum circuit breaker, a grounding switch and a main bus, the current-voltage transformer and the zero-sequence current transformer are fixedly connected to the lower wall of the inner side of the cable chamber, vacuum circuit breaker fixed connection is in the indoor side of circuit breaker handcart, earthing switch fixed connection is at the cable chamber lateral wall, main generating line fixed connection is in the indoor side of generating line, indoor side fixedly connected with bus sleeve pipe of generating line, static contact box, main generating line fixed connection is inboard at bus sleeve pipe, static contact box and main generating line fixed connection, the alternate insulating barrier of the indoor side fixedly connected with of generating line, cable chamber, alternate insulating barrier set up between earthing switch, main bus current voltage transformer, zero sequence current transformer, cable chamber lower wall fixedly connected with ground copper bar, the indoor side fixedly connected with secondary equipment subassembly of instrument.

As a further description of the above technical solution:

the vacuum circuit breaker is a vacuum circuit breaker special for high altitude.

As a further description of the above technical solution:

and the inner sides of the circuit breaker handcart chamber and the cable chamber are fixedly connected with condensation sensing heater assemblies.

As a further description of the above technical solution:

and vulcanizing the main bus and the grounding copper bar.

As a further description of the above technical solution:

the type of the grounding copper bar is 6X40mm²。

As a further description of the above technical solution:

the lower wall of the inner side of the cable chamber is fixedly connected with an arrester, and the arrester is arranged between the current-voltage transformer and the zero sequence current transformer.

As a further description of the above technical solution:

the supporting insulator is made of glass fiber reinforced epoxy resin.

The utility model discloses following beneficial effect has:

1. compared with the prior art, the utility model discloses, the external insulation strength margin is enough big, has satisfied the external insulation strength that high altitude air tightness degree of rise caused and has descended and carry out the requirement of revising, thereby has satisfied the requirement that the electric clearance increases 10% according to every 1000 meters of rising of height above sea level under the high altitude condition and revises thereby makes the impact withstand voltage and the power frequency withstand voltage of product reach the requirement that high altitude was used.

2. Compared with the prior art, the utility model discloses, the fine reinforcing epoxy of insulating material-glass that support insulator material chooseed for use to receive that the difference in temperature change influences not greatly and ageing-resistant degree is high, when guaranteeing high strength, deflection and ageing degree are all less, have adapted to under the high altitude condition to insulating complex requirement.

Generally speaking the utility model provides a be applied to safe in utilization, the reliable 40.5kV of operation under the high altitude environment and remove open-type high tension switchgear equipment.

Drawings

Fig. 1 is a sectional view of the overall structure of a 40.5KV withdrawable high-voltage switchgear provided by the present invention in a high altitude environment;

fig. 2 is the schematic view of the bearing insulator structure of the 40.5KV withdrawable high-voltage switch cabinet provided by the utility model under the high altitude environment.

Illustration of the drawings:

1. a front housing; 2. a current-voltage transformer; 3. a zero sequence current transformer; 4. a vacuum circuit breaker; 5. a grounding switch; 6. a main bus; 7. a partition plate; 8. a bus bushing; 9. a stationary contact box; 10. interphase insulating partition plates; 11. a lightning arrester; 12. a condensation sensing heater assembly; 13. a support insulator; 14. a circuit breaker handcart room; 15. a bus chamber; 16. a cable chamber; 17. an instrument room; 18. a ground copper bar; 19. a switch cabinet body; 20. and (4) secondary equipment components.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-2, the utility model provides a 40.5KV withdrawable high tension switchgear under high altitude environment: the device comprises a front shell 1, a switch cabinet body 19 and a supporting insulator 13, wherein the front shell 1 is rotationally connected with the switch cabinet body 19, a breaker handcart room 14 and an instrument room 17 are arranged on the inner wall of the front shell 1, the breaker handcart room 14 is arranged at the inner side of the front shell 1 and is close to the lower wall, the instrument room 17 is arranged above the breaker handcart room 14, a bus room 15 and a cable room 16 are arranged on the inner side of the switch cabinet body 19 from top to bottom, partition plates 7 are fixedly connected among the breaker handcart room 14, the bus room 15, the cable room 16 and the instrument room 17, primary equipment is arranged on the inner sides of the breaker handcart room 14, the bus room 15 and the cable room 16 and comprises a current and voltage transformer 2, a zero sequence current transformer 3, a vacuum circuit breaker 4, a grounding switch 5 and a main bus 6, the current and voltage transformer 2 and the zero sequence current transformer 3 are fixedly connected on the inner side of the cable room 16, vacuum circuit breaker 4 fixed connection is inboard at circuit breaker handcart room 14, earthing switch 5 fixed connection is at 16 lateral walls of cable chamber, 6 fixed connection of main generating line are inboard at generating line room 15, 15 inboard fixedly connected with bus sleeve 8 of generating line room, static contact box 9, 6 fixed connection of main generating line are inboard at bus sleeve 8, static contact box 9 and 6 fixed connection of main generating line, generating line room 15, 16 inboard fixedly connected with alternate insulating barrier 10 of cable chamber, alternate insulating barrier 10 sets up at earthing switch 5, 6 current-voltage transformer 2 of main generating line, between the zero sequence current transformer 3, 16 lower wall fixedly connected with ground copper bar 18 of cable chamber, 17 inboard fixedly connected with secondary equipment subassembly 20 of instrument room.

The vacuum circuit breaker 4 is a special vacuum circuit breaker 4 for high altitude to meet the requirements of high altitude environment.

The inner sides of the circuit breaker handcart chamber 14 and the cable chamber 16 are fixedly connected with the condensation sensing heater assembly 12, so that the danger caused by condensation generated in a high-humidity or large-temperature-change climatic environment can be prevented.

The main bus 6 and the ground copper bar 18 are vulcanized to increase the insulating performance.

The type of the grounding copper bar 18 is 6X40mm²The grounding copper bar 18 penetrates through each adjacent cabinet and is in good contact with the cabinet body, and the grounding copper bar 18 is used for components and parts which are directly grounded.

The lower wall of the inner side of the cable chamber 16 is fixedly connected with an arrester 11, and the arrester 11 is arranged between the current-voltage transformer 2 and the zero sequence current transformer 3.

The material of support insulator 13 is glass fiber reinforced epoxy, and support insulator 13 material chooses for use to receive that the temperature difference change influences little and insulating material that ageing-resistant degree is high, and glass fiber reinforced epoxy when guaranteeing high strength, deflection and ageing degree are all less, have adapted to under the high altitude condition to insulating complex requirement.

The working principle is as follows: the environmental conditions of the use position of the device are as follows: the utility model discloses a service environment strip altitude is no more than 4000m, the ambient air temperature is no more than 40 degrees centigrade, minimum ambient air temperature is not less than-30 degrees centigrade, the average relative humidity of ring day is not more than 95%, the average relative humidity of month is not more than 90%, earthquake intensity is no more than 8 grades, cubical switchboard body 19 and front shell 1, division board 7 are spliced after numerical control machine tool processing with 2mm aluminum-zinc coated steel plate, the assembled cubical switchboard can guarantee the uniformity of size specification, has very strong anticorrosive and anti-oxidation effect, and has the mechanical strength higher than the equivalent steel plate, the inside increases alternate insulating barrier 10, in order to satisfy the insulation requirement, busbar room 15 is equipped with bus sleeve 8 and static contact box 9, and main bus 6 leads to another cubical switchboard from a cubical switchboard, it is fixed through bus sleeve 8, it satisfies the insulation requirement of main bus 6 simultaneously, when the main bus 6 passes through the partition plate 7, the main bus is fixed by a bus sleeve 8, if internal fault electric arcs occur, the accident can be limited to spread to an adjacent cabinet, the mechanical strength of the main bus 6 can be ensured, the current-voltage transformer 2 is installed at the lower part of the cable chamber 16, the lightning arrester 11 is installed in the cable chamber 16, and the secondary equipment component 20 including a relay protection element, an instrument, a live display and a device for monitoring, controlling and protecting the primary equipment is installed in the instrument chamber 17The devices are all common devices in the market, and the detailed description is omitted in this embodiment, the condensation sensing heater assemblies 12 are respectively installed in the handcart room 14 and the cable room 16 of the circuit breaker, so as to prevent the danger caused by condensation generated in the climate environment with high humidity or large temperature change, and the cable room 16 is provided with a diameter of 6 × 40mm²The grounding copper bars 18 penetrate through the adjacent cabinets and are in good contact with the cabinet body, the grounding copper bars are used for components and parts which are directly grounded through the grounding copper bars 18, and meanwhile, the cabinet shells are spliced by the aluminum-clad zinc plates, so that the whole row of cabinet bodies are in a good grounding state, and the safety of operation operators is ensured.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the spirit and scope of the invention.

Claims (7)

1. The utility model provides a 40.5KV under high altitude environment moves away formula high tension switchgear, includes preceding shell (1), cubical switchboard body (19), supporting insulator (13), preceding shell (1) is connected with cubical switchboard body (19) rotation, its characterized in that: preceding shell (1) inner wall is provided with circuit breaker handcart room (14), instrument room (17), circuit breaker handcart room (14) sets up in the front shell (1) inboard and the position that is close to the lower wall, instrument room (17) set up in circuit breaker handcart room (14) top, cubical switchboard body (19) inboard from the top down is provided with bus-bar room (15), cable chamber (16), equal fixedly connected with division board (7) between circuit breaker handcart room (14), bus-bar room (15), cable chamber (16), instrument room (17), circuit breaker handcart room (14), bus-bar room (15), cable chamber (16) inboard are provided with primary equipment, primary equipment includes current-voltage transformer (2), zero sequence current transformer (3), vacuum circuit breaker (4), earthing switch (5), main bus (6), current-voltage transformer (2) are, Zero sequence current transformer (3) fixed connection is at the inboard lower wall of cable chamber (16), vacuum circuit breaker (4) fixed connection is inboard in circuit breaker handcart room (14), earthing switch (5) fixed connection is at cable chamber (16) lateral wall, main bus (6) fixed connection is inboard in bus chamber (15), bus chamber (15) inboard fixedly connected with bus sleeve pipe (8), static contact box (9), main bus (6) fixed connection is inboard in bus sleeve pipe (8), static contact box (9) and main bus (6) fixed connection, bus chamber (15), cable chamber (16) inboard fixedly connected with phase insulation barrier (10), phase insulation barrier (10) set up between earthing switch (5), main bus (6) current voltage transformer (2), zero sequence current transformer (3), the lower wall of the cable chamber (16) is fixedly connected with a grounding copper bar (18), and the inner side of the instrument chamber (17) is fixedly connected with a secondary equipment assembly (20).

2. The 40.5KV withdrawable high-voltage switchgear cabinet according to claim 1, characterized in that: the vacuum circuit breaker (4) is a vacuum circuit breaker (4) special for high altitude.

3. The 40.5KV withdrawable high-voltage switchgear cabinet according to claim 1, characterized in that: and the inner sides of the circuit breaker handcart chamber (14) and the cable chamber (16) are fixedly connected with a condensation sensing heater assembly (12).

4. The 40.5KV withdrawable high-voltage switchgear cabinet according to claim 1, characterized in that: and the main bus (6) and the grounding copper bar (18) are vulcanized.

5. The 40.5KV withdrawable high-voltage switchgear cabinet according to claim 1, characterized in that: the type of the grounding copper bar (18) is 6X40mm²。

6. The 40.5KV withdrawable high-voltage switchgear cabinet according to claim 1, characterized in that: the inner side lower wall of the cable chamber (16) is fixedly connected with an arrester (11), and the arrester (11) is arranged between the current-voltage transformer (2) and the zero sequence current transformer (3).

7. The 40.5KV withdrawable high-voltage switchgear cabinet according to claim 1, characterized in that: the supporting insulator (13) is made of glass fiber reinforced epoxy resin.

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