CN216082902U

CN216082902U - Direct current measuring mutual inductor

Info

Publication number: CN216082902U
Application number: CN202122610508.1U
Authority: CN
Inventors: 何勇
Original assignee: Guangdong Oskang Electric Co ltd
Current assignee: Guangdong Oskang Electric Co ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2022-03-18
Anticipated expiration: 2031-10-26

Abstract

The utility model discloses a direct current measuring transformer which comprises a first tube bus, wherein one end of the first tube bus is provided with a first filter screen, one side of the first tube bus is fixedly connected with a current divider, the current divider is sleeved with a second tube bus through a bus tube, one end of the second tube bus is provided with a second filter screen, a body shell is arranged between the first tube bus and the second tube bus, the side wall of the body shell is provided with a plurality of step holes, a third filter screen is arranged in the step holes, and the side wall of the body shell is provided with a plurality of radiating fins. According to the utility model, through the arrangement of the radiating fins and the stepped holes, the heat exchange between the inside and the outside of the cavity is accelerated, and the air convection is formed in the cavity, so that the heat dissipation of the diverter is accelerated, the expansion and deformation of the diverter are avoided, the measurement precision is improved, the arrangement of the first filter screen, the second filter screen and the third filter screen avoids a large amount of dust in the air from entering the cavity and accumulating on the surface of the diverter, and the service life of the diverter is prolonged.

Description

Direct current measuring mutual inductor

Technical Field

The utility model relates to the technical field of current transformers, in particular to a direct current measuring transformer.

Background

In order to ensure safe and economical operation of a power system, the operation condition of power equipment must be monitored and measured, but a general measuring and protecting device cannot be directly connected to primary high-voltage equipment, and a large current of the primary system needs to be converted into a small current in proportion to be supplied to a measuring instrument and a protecting device for use.

The direct current transformer measures direct current by adopting a resistance voltage division principle of a shunt, the shunt is a manganese-copper alloy element and is connected in series in a direct current line to be measured, and when the direct current to be measured is large, the volume and the weight of the shunt are large, the temperature rise is high, the deformation is large, and therefore the influence on the measurement precision is large.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the defects in the prior art and provides a direct current measuring transformer.

In order to achieve the purpose, the utility model adopts the following technical scheme: the utility model provides a direct current measures mutual-inductor, includes that first pipe is female, the first female one end inner wall of keeping away from the flange face of first pipe is fixed and is equipped with first filter screen between, the female one side fixedly connected with shunt that is close to the flange face of first pipe, the female one side of keeping away from first pipe of shunt is equipped with a generating line section of thick bamboo, the surface cover of generating line section of thick bamboo is equipped with second pipe female, the second pipe is female to keep away from fixedly being equipped with the second filter screen between the one end inner wall of shunt, be equipped with the body shell between the female flange face of first pipe and second pipe, the body shell encloses into the cavity with the female second pipe of first pipe, the lateral wall of body shell is close to both ends department equidistant and is equipped with a plurality of step holes, fixedly connected with third filter screen on the step face in step hole, the lateral wall of body shell runs through along circumference equidistant and is equipped with the fin.

Further, the shunt is manufactured integrally with the bus bar barrel.

Furthermore, threaded holes are formed in two end faces of the body shell, mounting holes are formed in flange faces of the first pipe nut and the second pipe nut, mounting bolts are arranged in the mounting holes, and the mounting bolts are in threaded connection with the threaded holes.

Furthermore, a first insulating pad is arranged between the contact surface of the second tube bus and the shell, and a second insulating pad is arranged between the mounting bolt and the pressing surface of the second tube bus.

Furthermore, the diameter of the step hole is far smaller than that of the through hole in the middle of the shunt.

Further, the stepped hole penetrates through the side wall of the housing, and the large-diameter end of the stepped hole is close to the outer surface of the housing.

The utility model has the beneficial effects that:

when the air flow divider is used, the heat exchange between the inside and the outside of the cavity is accelerated by arranging the radiating fins on the shell, the air convection is formed in the cavity by arranging the stepped holes, the heat exchange between the inside and the outside of the cavity is accelerated, the heat dissipation of the air flow divider in the cavity is accelerated, the expansion and the deformation of the air flow divider are avoided, the measurement precision is improved, the arrangement of the first filter screen, the second filter screen and the third filter screen avoids a large amount of dust in the air from entering the cavity and accumulating on the surface of the air flow divider, and the service life of the air flow divider is prolonged.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an enlarged view of A of FIG. 1 in accordance with the present invention;

FIG. 3 is a schematic cross-sectional view of the shell of the present invention at the stepped aperture;

fig. 4 is a three-dimensional view of the shell of the present invention.

Illustration of the drawings:

1. a first pipe nut; 2. a first filter screen; 3. a cavity; 4. a body shell; 5. a heat sink; 6. a flow divider; 7. a bus bar drum; 8. a second pipe nut; 9. a second filter screen; 10. a second insulating pad; 11. a first insulating pad; 12. a third filter screen; 13. a stepped bore; 14. a threaded bore.

Detailed Description

Fig. 1 to 4 show, relate to a direct current measurement mutual inductor, including first tub of mother 1, it is equipped with first filter screen 2 to fix between the one end inner wall that flange face was kept away from to first tub of mother 1, one side fixedly connected with shunt 6 that first tub of mother 1 is close to the flange face, one side that first tub of mother 1 was kept away from to shunt 6 is equipped with bus-bar section of thick bamboo 7, the surface cover of bus-bar section of thick bamboo 7 is equipped with second tub of mother 8, it is equipped with second filter screen 9 to fix between the one end inner wall that shunt 6 was kept away from to second tub of mother 8, be equipped with body shell 4 between the flange face of first tub of mother 1 and second tub of mother 8, body shell 4 encloses into cavity 3 with first tub of mother 1 second tub of mother 8, the lateral wall of body shell 4 is close to both ends department equidistant and is equipped with a plurality of step holes 13, fixedly connected with third filter screen 12 on the step face of step hole 13, the lateral wall of body shell 4 runs through along circumference equidistant fin 5.

When the direct current measuring transformer is used, when direct current on a series circuit is large, and the shunt 6 generates heat seriously, the radiating fins 5 conduct heat in the cavity 3 to the outside of the shell 4, so that heat dissipation in the cavity 3 is accelerated, meanwhile, air in the cavity 3 is subjected to thermal expansion, as the diameter of the stepped hole 13 is far smaller than that of the through hole in the shunt 6, hot air is preferentially discharged from the middle of the shunt 6 and is finally discharged to the outside of the cavity 3 from the open ends of the first tube nut 1 and the second tube nut 8, the pressure in the cavity 3 is reduced, external air is filtered by the third filter screen 12 and then enters the cavity 3 from the stepped hole 13, air convection is formed, cooling in the cavity 3 is accelerated, so that cooling of the shunt 6 is accelerated, the measuring precision of the shunt 6 is improved, and certain practicability is achieved.

In a further scheme, the shunt 6 and the bus tube 7 are manufactured integrally, so that the manufacturing process is met, and the manufacturing cost is reduced.

In a further scheme, threaded holes 14 are formed in two end faces of the body shell 4, mounting holes are formed in flange faces of the first pipe nut 1 and the second pipe nut 8, mounting bolts are arranged in the mounting holes and are in threaded connection with the threaded holes 14, and the first pipe nut 1, the second pipe nut 8 and the body shell 4 are fixedly connected through the mounting bolts and the threaded holes 14.

In a further scheme, a first insulating pad 11 is arranged between the contact surface of the second tube bus 8 and the shell 4, and a second insulating pad 10 is arranged between the mounting bolt and the pressing surface of the second tube bus 8, so that a closed loop is prevented from being formed between the shell 4 and the first tube bus 1.

In a further scheme, the diameter of the stepped hole 13 is far smaller than that of the through hole in the middle of the flow divider 6, and when the air in the cavity 3 expands due to heating, the air is preferentially discharged from the hole with the larger diameter and the smaller pressure in the middle of the flow divider 6 to two ends.

In a further scheme, the stepped hole 13 penetrates through the side wall of the housing 4, and the large-diameter end of the stepped hole 13 is close to the outer surface of the housing 4, so that the processing and manufacturing of the stepped hole 13 are facilitated.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a direct current measures mutual-inductor, includes first tub of mother (1), its characterized in that: the pipe joint is characterized in that a first filter screen (2) is fixedly arranged between the inner walls of one ends, far away from the flange faces, of the first pipe nuts (1), a splitter (6) is fixedly connected to one side, close to the flange faces, of the first pipe nuts (1), a bus tube (7) is arranged on one side, far away from the first pipe nuts (1), of the splitter (6), a second pipe nut (8) is sleeved on the outer surface of the bus tube (7), a second filter screen (9) is fixedly arranged between the inner walls of one ends, far away from the splitter (6), of the second pipe nut (8), a body shell (4) is arranged between the flange faces of the first pipe nuts (1) and the second pipe nuts (8), a cavity (3) is formed by the body shell (4) and the first pipe nuts (1) and the second pipe nuts (8), a plurality of step holes (13) are equidistantly arranged on the side wall, close to the two ends, of the body shell (4), and a third filter screen (12) is fixedly connected to the surface of the step holes (13), the side wall of the body shell (4) is provided with radiating fins (5) at equal intervals along the circumferential direction in a penetrating manner.

2. A direct current measuring transformer according to claim 1, characterized in that: the shunt (6) and the bus tube (7) are manufactured integrally.

3. A direct current measuring transformer according to claim 1, characterized in that: threaded holes (14) are formed in two end faces of the shell (4), mounting holes are formed in flange faces of the first pipe bus (1) and the second pipe bus (8), mounting bolts are arranged in the mounting holes, and the mounting bolts are in threaded connection with the threaded holes (14).

4. A direct current measuring transformer according to claim 1, characterized in that: a first insulating pad (11) is arranged between the contact surface of the second tube bus (8) and the shell (4), and a second insulating pad (10) is arranged between the mounting bolt and the pressing surface of the second tube bus (8).

5. A direct current measuring transformer according to claim 1, characterized in that: the diameter of the step hole (13) is far smaller than that of the through hole in the middle of the flow divider (6).

6. A direct current measuring transformer according to claim 1, characterized in that: the stepped hole (13) penetrates through the side wall of the shell (4), and the large-diameter end of the stepped hole (13) is close to the outer surface of the shell (4).