CN212341301U

CN212341301U - Overhead line detection device

Info

Publication number: CN212341301U
Application number: CN202020539987.5U
Authority: CN
Inventors: 燕琳伟; 杨爱军; 吴华利; 毛华; 方锦
Original assignee: Zhuhai Galaxy Smart Grid Co ltd
Current assignee: Zhuhai Galaxy Smart Grid Co ltd
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2021-01-12
Anticipated expiration: 2030-04-13

Abstract

The utility model discloses an overhead line detection device. The utility model discloses a set up conductor and overhead conductor electric connection, and through the first end that sets up first electric capacity with conductor electric connection, the third end electric connection of second end and second electric capacity, shielded cable's first wire and second wire are connected with the third end and the fourth end of second electric capacity respectively, and the fourth end ground connection, utilize electric capacity partial pressure principle, change the voltage value of overhead conductor and export through shielded cable based on the inverse ratio of the capacitance value of first electric capacity and second electric capacity, conveniently measure to monitor the insulation degradation condition of overhead conductor, need not set up the iron core, simple structure, and small; and the saturation phenomenon can not occur, and the safety is improved. The utility model relates to an overhead line detection device, but wide application in power equipment technical field.

Description

Overhead line detection device

Technical Field

The utility model belongs to the technical field of the power equipment technique and specifically relates to an overhead line detection device.

Background

With the rapid development of a power distribution network, a 10kV overhead line is often found in the power distribution network, and because a power distribution area is covered by trees, seriously corroded, and is influenced by various uncertain factors such as sunlight exposure, the overhead line is often subjected to ground insulation degradation, so that a phase voltage value changes, the overall operation of power equipment and a system is influenced for a long time, and even equipment is damaged when the overhead line is more serious, and the whole power system is broken down, so that the detection of the overhead line is very important.

At present, a voltage transformer is usually adopted to detect the line phase voltage, on one hand, the voltage transformer has large volume and heavy weight, and is required to be arranged on a metal bracket and fixed on an electric pole, so that the construction is complicated; on the other hand, because the voltage transformer adopts the electromagnetic induction principle, magnetic flux is exchanged between the primary and the secondary through iron core exchange, and ferromagnetic resonance overvoltage can appear due to the existence of an iron core structure, and when overvoltage is generated, the excitation current of a winding of the voltage transformer is greatly increased due to the saturation of the iron core of the voltage transformer, so that the operation safety of equipment and a power grid can be influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims to provide a: provided is an overhead line detection device which is simple and safe in structure.

The utility model adopts the technical proposal that: an overhead line detection apparatus comprising:

a conductor for electrically connecting with the overhead conductor;

a first capacitor having a first end and a second end, the first end being electrically connected to the conductor;

the second capacitor is provided with a third end and a fourth end, and the third end is electrically connected with the second end;

and the shielding cable is provided with a first conducting wire and a second conducting wire, one end of the first conducting wire is connected with the third end, and one end of the second conducting wire is connected with the fourth end and is grounded.

Further, a housing is included that houses the first capacitor, the second capacitor, and at least a portion of the shielded electrical cable.

Further, the other end of the first wire and the other end of the second wire extend out of the housing.

Further, the shell is made of an insulating material.

Further, the outer surface of the shell is provided with at least one umbrella skirt structure.

Further, still include the base, the base with second electric capacity is connected and ground connection, the conductor with the base is located the difference side of shell.

Further, still include the base, fourth end passes through the base ground connection.

Further, the conductor includes an insertion hole into which an overhead wire is inserted.

Further, the plug also comprises a top cover, wherein one end of the insertion hole is provided with an opening, and the top cover covers the opening.

Furthermore, at least one fixing bolt is arranged on the top cover.

The utility model has the advantages that: the insulation degradation condition of the overhead conductor is monitored by converting the voltage value of the overhead conductor based on the inverse ratio of the capacitance values of the first capacitor and the second capacitor and outputting the converted voltage value through the shielded cable by utilizing a capacitance voltage division principle through setting the conductor to be electrically connected with the overhead conductor, setting the first end of the first capacitor to be electrically connected with the conductor, setting the second end of the first capacitor to be electrically connected with the third end of the second capacitor, setting the first lead and the second lead of the shielded cable to be respectively connected with the third end and the fourth end of the second capacitor, and grounding the fourth end; and the saturation phenomenon can not occur, and the safety is improved.

Drawings

Fig. 1 is a front view of an overhead line inspection device according to the present invention;

fig. 2 is a schematic diagram of the operation principle of the embodiment.

Detailed Description

The invention will be further explained and explained with reference to the drawings and the embodiments in the following description.

Referring to fig. 1, the embodiment of the present invention provides an overhead line detecting device, including top cap 1, conductor 2, shell 3, base 4, first electric capacity C1, second electric capacity C2 and shielded cable 5. Wherein the first capacitor C1, the second capacitor C2 and the shielded cable 5 are cast inside the housing 3.

Referring to fig. 1, in the present embodiment, the conductor 2 is a copper conductor, the conductor 2 is provided with an insertion hole 21, the insertion hole 21 has an opening 22 at an upper end, and the overhead conductor can be inserted into the insertion hole 21 through the opening 22 and pass through, so that the conductor 2 is in direct contact with the overhead conductor and is in electrical contact with the overhead conductor. In the present embodiment, the overhead conductor refers to a 10kV overhead conductor.

Referring to fig. 1, in the present embodiment, the top cover 1 is disposed on the upper side of the conductor 2, the top cover 1 covers the opening 22 and has four fixing bolts 11, and in other embodiments, other numbers of fixing bolts 11 may be disposed, so that the top cover 1 can be pressed against the overhead conductor to fix the overhead conductor.

Referring to fig. 1, in the present embodiment, the housing 3 is made of an insulating material, specifically, epoxy resin. The housing 3 houses the first capacitor C1, the second capacitor C2, a portion of the shielded electrical cable 5 and a number of specially made copper conductors. The outer surface of the housing 3 is provided with four disc-shaped sheds 31, and in other embodiments other numbers or other shapes of sheds 31 may be provided. The shell 3 made of insulating materials is arranged to have good electrical insulation performance, and the four disc-shaped umbrella skirt structures 31 are arranged to increase creepage distance, so that the outdoor insulation requirement of large creepage distance is met. The conductor 2 is arranged on the upper side of the shell 3, and the shell 3 supports the conductor 2.

Referring to fig. 1 and 2, in the present embodiment, the first capacitor C1 has a first end a and a second end b, and the first end a is electrically connected to the conductor 2 through a copper wire. The second capacitor C2 has a third terminal C and a fourth terminal d, and the third terminal C is electrically connected to the second terminal b through a copper wire.

Referring to fig. 1 and 2, in the present embodiment, the base 4 is provided at a lower side of the housing 3, supporting the housing 3. Base 4 is used for being fixed in on the pole and good ground connection, base 4 with fourth end d is connected, makes fourth end d passes through base 4 ground connection. In this embodiment, the capacitance of the first capacitor C1 is 900pF, and the capacitance of the second capacitor C2 is 2.38 μ F.

Referring to fig. 1 and 2, in this embodiment, the single-end of the shielding wire of the shielded cable 5 is grounded, and has a first wire and a second wire, one end of the first wire is connected to the third end C, one end of the second wire is connected to the fourth end d and is grounded, and the other end of the first wire and the other end of the second wire extend out of the housing 3, so as to measure the voltage at the two ends of the second capacitor C2 by a voltage meter. The voltmeter can be a single-phase voltmeter and is used for measuring voltage and simultaneously uploading data through the data interface for the background system to check.

With reference to fig. 1 and 2, the following describes the specific working process of the present invention in detail: when a 10kV overhead conductor is inserted into the opening 22 and electrically connected with the conductor 2, the overhead conductor is fixed through the top cover 1 and the fixing bolt 11, the conductor 2 is electrically contacted with a bare conductor of the 10kV overhead conductor, based on a capacitance voltage division principle, a primary voltage value V1 on the 10kV overhead conductor is converted into a secondary voltage value V2 according to the inverse ratio of capacitance values of a first capacitor C1 and a second capacitor C2, and the secondary voltage value V2 is conveyed into a voltmeter through the shielding cable 5. Under the condition that the insulation of the 10kV overhead conductor is normal and has no degradation, the primary voltage value V1 is 10kV, the secondary voltage value V2 is 3.75V, when the insulation degradation of the 10kV overhead conductor occurs, the primary voltage value V1 is reduced, and the secondary voltage value V2 is also reduced, so that the insulation degradation condition of the 0kV overhead conductor can be known through the secondary voltage value V2 measured by a voltmeter, and the monitoring function is realized.

The utility model discloses an overhead line detection device, inner structure do not have the iron core that sets up in addition, and insulating form is simple, has small, light in weight, and the precision is high, characteristics such as reliability height, to the influence of stray resistance and adjacent effect on the 10kV circuit that can effectively eliminate after the structural optimization design to the precision, the precision can reach 0.2S level, and the linearity is good.

While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.

Claims

1. An overhead line detection device, comprising:

a conductor for electrically connecting with the overhead conductor;

2. An overhead line detection apparatus according to claim 1, wherein: further included is a housing that houses the first capacitor, the second capacitor, and at least a portion of the shielded electrical cable.

3. An overhead line detection apparatus according to claim 2, wherein: the other end of the first wire and the other end of the second wire extend out of the shell.

4. An overhead line detection apparatus according to claim 2, wherein: the shell is made of insulating materials.

5. An overhead line detection apparatus according to claim 2, wherein: the outer surface of the shell is provided with at least one umbrella skirt structure.

6. An overhead line detection apparatus according to claim 2, wherein: still include the base, the base with second electric capacity is connected and ground connection, the conductor with the base is located the difference side of shell.

7. An overhead line detection apparatus according to claim 1, wherein: the fourth end is grounded through the base.

8. An overhead line detection apparatus according to claim 1, wherein: the conductor includes an insertion hole into which an overhead wire is inserted.

9. An overhead line detection apparatus according to claim 8, wherein: the plug also comprises a top cover, wherein one end of the insertion hole is provided with an opening, and the top cover covers the opening.

10. An overhead line detection apparatus according to claim 9, wherein: the top cover is provided with at least one fixing bolt.