CN217034209U

CN217034209U - Thermal shrinkage insulation sheath leakage current detection device

Info

Publication number: CN217034209U
Application number: CN202220542709.4U
Authority: CN
Inventors: 汪隆臻; 魏敏; 刘常鸿; 韦宇; 何涛; 金亚曦
Original assignee: State Grid Corp of China SGCC; MaAnshan Power Supply Co of State Grid Anhui Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; MaAnshan Power Supply Co of State Grid Anhui Electric Power Co Ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-07-22
Anticipated expiration: 2032-03-14

Abstract

The utility model discloses a device for detecting leakage current of a heat-shrinkable insulating sheath, and relates to the technical field of insulating leakage detection. This pyrocondensation insulating sheath leakage current detection device through the installation wedge detecting head in the one end of casing, cup joints the upper and lower end of wedge detecting head with the slider. When in actual detection, the inner surface of the wedge-shaped detecting head can be in certain contact with the busbar, but the detecting head cannot be completely fixed on the busbar, and the pulley on the sliding block sleeve can be moved on the busbar randomly by the detection device, so that the detection of different positions of the transformer busbar is facilitated; the buzzer and the indicator lamp are arranged in the shell, so that the detection device can give an alarm in time at the first time when the leakage current is detected, a maintainer can quickly respond and know the running state of a detected object in time; and through setting the threshold current of the buzzer and the indicator light.

Description

Current detection device is revealed to pyrocondensation insulating sheath

Technical Field

The utility model relates to the technical field of insulation leakage detection, in particular to a leakage current detection device for a heat-shrinkable insulation sheath.

Background

The busbar is a conductor for collecting and distributing current, and is also called a bus bar. In high voltage power distribution units, the busbars are often bare conductors. The thermal shrinkage insulating sheath is widely applied to outer coatings of bus bars and cable joints of transformer substations due to excellent electrical and mechanical properties, and mainly plays roles in corrosion prevention and insulation protection. In the actual operation of a transformer substation, due to the existence of insulation deterioration (insulation deterioration caused by aging and metal abrasion noise at a busbar fixing position) and the climbing condition of foreign matters (small animals), interphase short circuit accidents of busbar rows wrapped by insulation sheaths frequently occur, and the interphase short circuit accidents become one of main faults threatening the safe operation of the transformer substation.

At present, the research on the short-circuit fault of the transformer caused by the insulation deterioration of the busbar heat-shrinkable insulating sheath and the foreign matter climbing is generally in the research stage of fault types and fault occurrence reasons, and for the detection of the insulating state of the sheath, the insulation state of the busbar sheath is judged manually through measuring the relative leakage current and the insulation resistance test between the busbar and a porcelain insulator hardware fitting, so that the misjudgment and the misjudgment are caused.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Aiming at the defects of the prior art, the utility model provides a device for detecting leakage current of a heat-shrinkable insulating sheath, which solves the problems of erroneous judgment and missing judgment of the insulating state of the sheath by measuring the relative leakage current and the insulation resistance test between a bus bar and a porcelain insulator hardware fitting and manually judging the insulating state of the bus bar sheath.

(II) technical scheme

In order to achieve the purpose, the utility model is realized by the following technical scheme: a leakage current detection device for a thermal shrinkage insulating sheath comprises a shell, wherein the left end and the right end of the shell are respectively provided with a grounding wire and a wedge-shaped probe, the left end of the inner wall of the shell is provided with a current detector, the grounding wire is electrically connected with the current detector, a first current conductor is arranged in the shell, the right end of the first current conductor is electrically connected with the wedge-shaped probe head, the right end of the first current conductor is electrically connected with a first adapter, the upper end of the first adapter is electrically connected with an indicator light, the indicator light penetrates through the upper wall of the shell, the lower end of the first rotating joint is connected with a buzzer, the buzzer penetrates through the lower wall of the shell, be provided with the second adapter in the casing, the upper and lower both ends of second adapter respectively with pilot lamp, buzzer electric connection, the second adapter passes through second current conductor and current detector electric connection.

Preferably, the left end of the wedge-shaped probe is sleeved with a rubber ring, and the rubber ring is tightly attached to the right side of the shell.

Preferably, the outer side of the wedge probe head is covered with an insulating film.

Preferably, a third adapter is arranged between the second current conductor and the current detector.

Preferably, the second current conductor is arranged inside the shell through an insulating column, the bottom of the insulating column is connected with the bottom of the inner wall of the shell, and the top of the insulating column is connected with the second current conductor.

Preferably, a sliding block sleeve is arranged on the inner side of the jaw of the wedge-shaped probe, and a pulley is arranged on the sliding block sleeve.

Preferably, the data output end of the current detector is electrically connected with a wireless data module.

A method for detecting leakage current of a thermal shrinkage insulating sheath comprises a busbar and a device for detecting leakage current of the thermal shrinkage insulating sheath, wherein a claw of a wedge-shaped probe is connected to the busbar in a sliding mode through a sliding block sleeve and a pulley, and the method comprises the following steps:

the method comprises the following steps: grounding the grounding wire;

step two: respectively setting threshold currents of a buzzer and an indicator light;

step three: moving the wedge-shaped probe head bus bar;

step three: when the current passing through the buzzer and the indicating lamp exceeds the threshold current, the buzzer and the indicating lamp send out alarm signals.

(III) advantageous effects

The utility model provides a device for detecting leakage current of a heat-shrinkable insulating sheath. The method has the following beneficial effects:

(1) this current detection device is revealed to pyrocondensation insulating sheath through the one end installation wedge detecting head at the casing, cup joints the upper and lower end of wedge detecting head with the slider. When actual detection, the internal face of the wedge-shaped probe head can be in certain contact with the busbar, the probe head cannot be completely fixed on the busbar, and the pulley on the sliding block sleeve can be a detection device which can move on the busbar at will, so that detection of different positions of the transformer busbar is facilitated.

(2) The detection device can give an alarm in time at the first time when the detection device detects the leakage current by installing the buzzer and the indicator lamp in the shell, so that a maintainer can quickly respond and know the running state of a detection object in time; and through the setting of the threshold current of the buzzer and the indicator light, different automatic alarm conditions can be selectively set within an allowable range according to the leakage current bearing degree of a detection object. In addition, the current detector is fixedly installed in the shell, and the wireless transmission module is arranged at the information output end of the current detector, so that the leakage current can be timely processed, the remote transmission of detection data can be realized, the information loss caused by manual detection can be avoided, and the safety of detection personnel can be ensured through remote data transmission. The detection personnel do not need to carry out close-range manual detection, and power failure processing is not needed to be carried out on a detection object during detection, so that detection of leakage current in an operating state is realized.

Drawings

FIG. 1 is a cross-sectional view of the internal structure of the present invention;

FIG. 2 is a schematic view of the present invention in use;

FIG. 3 is a schematic view of a wedge probe head and a slider sleeve.

In the figure: 1. a housing; 2. a wedge probe; 21. a sliding block sleeve; 22. a pulley; 3. an insulating film; 4. a rubber ring; 5. a first current conductor; 6. a first adapter; 7. a connecting wire; 8. a buzzer; 9. an indicator light; 10. a second adapter; 11. a second current conductor; 12. an insulating column; 13. a third adapter; 14. a current detector; 15. a ground line; 16. a transformer bushing; 17 bus bar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, an embodiment of a device for detecting leakage current of a heat shrinkable insulating sheath according to the present invention includes: the device comprises a shell 1, wherein a wedge-shaped probe 2 is arranged at the center of one short end side of the shell 1, a connecting hole of a grounding wire 15 is formed in the other short end side of the shell 1 opposite to the short end side where the wedge-shaped probe 2 is arranged, and a buzzer 8, an indicator lamp 9 and a current detector 14 are fixedly arranged in the shell 1; a wireless data module is mounted at the data output of the current detector 14. The shell 1 is made of traditional insulating materials, and damage to the detection device caused by high-voltage current in the detection process is avoided. The shell 1 is provided with a circular notch at one side of the wedge-shaped probe 2, and a first current conductor 5 penetrates through the notch to be connected with the wedge-shaped probe 2; and a rubber ring 4 is arranged at the round gap to seal and protect other equipment in the shell. The outer surface of the wedge-shaped probe 2 and the part of the first current conductor 5 exposed outside the shell 1 are covered with a primary insulating film 3, and the part of the detection device exposed in the air is protected from oxidation; the upper end and the lower end of the wedge-shaped probe 2 are both provided with a sliding block sleeve 21, and a pulley 22 (as shown in figure 3) is arranged on the sliding block sleeve 22, so that the detection device can conveniently move when detecting leakage current.

The first current conductor 5 is connected with a first adapter 6 on the shell 1, two ends of the second current conductor 11 are respectively connected with a second adapter 10 and a third adapter 13, the first adapter 6 and the second adapter 10 are three-hole metal adapters, and the third adapter 13 is a two-hole metal adapter. Two connecting wires 7 are led out from two symmetrical interfaces of the first adapter 6 and the second adapter 10 respectively, the two connecting wires 7 led out from the first adapter 6 are connected with current input ends of the buzzer 8 and the indicator lamp 9 respectively, and the two connecting wires 7 led out from the second adapter 10 are connected with current output ends of the buzzer 8 and the indicator lamp 9 respectively. The buzzer 8 and the indicator light 9 are respectively arranged at two long end sides of the shell 1; the buzzer 8 and the indicator light 9 are both provided with proper threshold currents, and when the current flowing through the buzzer 8 and the indicator light 9 exceeds the threshold currents, the buzzer 8 and the indicator light 9 can automatically alarm.

The second current conductor 10 is connected with the signal acquisition end of the current detector 14 through another interface of the third adapter 13 by a connecting wire 7; the second current conductor 10 is fixed by two insulating columns 12; the bottom of the current detector 14 is provided with four screw holes for fixing the current detector 14 to the housing 1. The current transmission path inside the shell 1 comprises a first current conductor 5, a second current conductor 11, a first adapter 6, a second adapter 10, a third adapter 13 and a connecting wire 7, wherein the surface of the first adapter 6, the second adapter 10, the third adapter 13 and the connecting wire 7 are covered with a primary insulating film 3, so that the current is prevented from secondary leakage inside the detection device, and the safety use of the detection device is prevented from being influenced. A wireless transmission module is installed at the information output end of the current detector 14, and leakage current data information is transmitted to a mobile terminal of a control room so as to be convenient for later analysis; one end of the current detector 14 is led out of a grounding wire 15, and is led out of the detection device through a hole of the grounding wire 15 on the shell 1, and during actual detection, the grounding wire 15 is connected with a grounding pile on site or is directly buried in the ground.

According to the working principle, as shown in fig. 2, the transformer busbar 17 is wrapped by an insulating sheath (the transformer busbar 17 with the voltage level of 10kV adopts a single-layer heat-shrinkable insulating sheath, the transformer busbar 17 with the voltage level of 35kV adopts a double-layer heat-shrinkable insulating sheath), the two transformer low-voltage bushings 16 are connected through the transformer busbar 17, and the connection between the busbar 17 and the pile heads of the two transformer low-voltage bushings 16 adopts a silicone rubber self-adhesive insulating tape winding process. During actual detection, can install whole leakage current detection device on the female 17 of transformer through wedge detecting head 2 to remove wedge detecting head 2 through the pulley on the wedge detecting head 2, realize arranging 17 different positions's of transformer detection.

In addition, it should be noted that the wedge-shaped probe head 2 is made of an elastic metal conductive material, so that the wedge-shaped probe head 2 is conveniently mounted on the busbar 17.

Once the insulating sheath on the surface of the transformer busbar 17 has short-circuit faults of the transformer such as insulation degradation or foreign matter climbing, the generated leakage current flows into the leakage current detection device through the contact surface between the wedge-shaped probe 2 and the busbar 17. According to the maximum leakage current bearing condition of the transformer busbar insulation sheath, a proper threshold current is set, when leakage current occurs and is within the bearing range of detection equipment, the buzzer 8 or the indicator lamp 9 does not have any reaction, but when the detected leakage current is larger than the set threshold current, the current flows through the buzzer 8 or the indicator lamp 9, the detection device can automatically alarm, and can remind maintenance personnel in the first time to realize timely treatment of the detection equipment. The current detector 14 arranged in the detection device can convert the detected leakage current into data information in time, so that the leakage of useful information is avoided, the data information can be remotely transmitted to the mobile terminal of the control room by arranging the wireless transmission module, and a theoretical basis and data support are provided for subsequent fault type identification research.

According to the utility model, through the functions of alarming, data detection and remote transmission, the problem that the leakage current of the insulating sheath of the transformer busbar cannot be detected in time in the prior art can be solved, and the remote real-time monitoring of the leakage current data of the insulating sheath of the transformer busbar under the electrified condition can be realized in time, so that maintenance personnel can timely and efficiently carry out the troubleshooting and maintenance of the insulating sheath of the transformer busbar, avoid unnecessary economic loss, effectively solve the problems of difficult field monitoring, long power failure maintenance period and the like, and effectively solve the problems of difficult field monitoring, long power failure maintenance period and the like

It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on structures shown in the drawings, and are only used for convenience in describing the present invention, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the technical scheme, the terms "first" and "second" are only used for referring to the same or similar structures or corresponding structures with similar functions, and are not used for ranking the importance of the structures, or comparing the sizes or other meanings.

In addition, unless expressly stated or limited otherwise, the terms "mounted" and "connected" are to be construed broadly, e.g., the connection may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two structures can be directly connected or indirectly connected through an intermediate medium, and the two structures can be communicated with each other. To those skilled in the art, the specific meanings of the above terms in the present invention can be understood in light of the context of the present application, along with the general concepts of the utility model.

Claims

1. The utility model provides a pyrocondensation insulating sheath leakage current detection device, includes casing (1), its characterized in that: the cable is characterized in that a grounding wire (15) and a wedge-shaped detection head (2) are respectively arranged at the left end and the right end of the shell (1), a current detector (14) is arranged at the left end of the inner wall of the shell (1), the grounding wire (15) is electrically connected with the current detector (14), a first current conductor (5) is arranged in the shell (1), the right end of the first current conductor (5) is electrically connected with the wedge-shaped detection head (2), the right end of the first current conductor (5) is electrically connected with a first adapter (6), an indicator lamp (9) is electrically connected with the upper end of the first adapter (6), the indicator lamp (9) penetrates through the upper wall of the shell (1), a buzzer (8) is connected with the lower end of the first adapter (6), the buzzer (8) penetrates through the lower wall of the shell (1), a second adapter (10) is arranged in the shell (1), the upper and lower both ends of second adapter (10) respectively with pilot lamp (9), bee calling organ (8) electric connection, second adapter (10) are through second current conductor (11) and current detector (14) electric connection, and the left end cover of wedge detecting head (2) is equipped with rubber ring (4), the right side of casing (1) is hugged closely in rubber ring (4).

2. The heat-shrinkable insulating sheath leakage current detection device according to claim 1, wherein: the outer side of the wedge-shaped probe head (2) is covered with an insulating film.

3. The heat-shrinkable insulating sheath leakage current detection device according to claim 1, wherein: and a third adapter (13) is arranged between the second current conductor (11) and the current detector (14).

4. The heat-shrinkable insulating sheath leakage current detection device according to claim 1, wherein: the second current conductor (11) is arranged inside the shell (1) through an insulating column (12), the bottom of the insulating column (12) is connected with the bottom of the inner wall of the shell (1), and the top of the insulating column (12) is connected with the second current conductor (11).

5. The heat-shrinkable insulating sheath leakage current detection device according to claim 1, wherein: the data output end of the current detector (14) is electrically connected with a wireless data module.

6. The heat-shrinkable insulating sheath leakage current detection device according to claim 1, wherein: the inner side of the claw of the wedge-shaped probe (2) is provided with a sliding block sleeve (21), and the sliding block sleeve is provided with a pulley (22).