CN114578198A - Method for detecting leakage current of heat-shrinkable insulating sheath - Google Patents
Method for detecting leakage current of heat-shrinkable insulating sheath Download PDFInfo
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- CN114578198A CN114578198A CN202210245422.XA CN202210245422A CN114578198A CN 114578198 A CN114578198 A CN 114578198A CN 202210245422 A CN202210245422 A CN 202210245422A CN 114578198 A CN114578198 A CN 114578198A
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- leakage current
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 239000000523 sample Substances 0.000 claims abstract description 21
- 239000004020 conductor Substances 0.000 claims description 26
- 238000009413 insulation Methods 0.000 claims description 13
- 229920001971 elastomer Polymers 0.000 claims description 6
- 210000000078 claw Anatomy 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 7
- 230000009194 climbing Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000012212 insulator Substances 0.000 description 2
- 230000016507 interphase Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a method for detecting leakage current of a heat-shrinkable insulating sheath, and relates to the technical field of insulating leakage detection. According to the method for detecting the leakage current of the heat-shrinkable insulating sheath, the wedge-shaped probe is arranged at one end of the shell, and the upper end and the lower end of the wedge-shaped probe are sleeved with the sliding block. 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, and 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
Technical Field
The invention relates to the technical field of insulation leakage detection, in particular to a method for detecting leakage current of a heat-shrinkable insulation sheath.
Background
The busbar is a conductor for collecting and distributing current, also called a busbar. In high voltage power distribution devices, 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 stage of exploring the fault type and the fault occurrence reason, 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 earth leakage current and the insulation resistance test between the busbar and the porcelain insulator hardware fitting, so that the misjudgment and the misjudgment are caused.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method 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 busbar and a porcelain insulator hardware fitting and manually judging the insulating state of the sheath of the busbar.
(II) technical scheme
In order to achieve the purpose, the invention 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 adapter is connected with a buzzer, the buzzer penetrates through the lower wall of the shell, the shell is internally provided with a second adapter, the upper end and the lower end of the second adapter are respectively electrically connected with the indicator lamp and the buzzer, and the second adapter is electrically connected with the current detector through a second current conductor.
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 busbar;
step three: when the current passing through the buzzer and the indicator lamp exceeds the threshold current, the buzzer and the indicator lamp send out alarm signals.
(III) advantageous effects
The invention provides a method for detecting leakage current of a heat-shrinkable insulating sheath. The method has the following beneficial effects:
(1) according to the method for detecting the leakage current of the heat-shrinkable insulating sheath, the wedge-shaped probe is arranged at one end of the shell, and the upper end and the lower end of the wedge-shaped probe are sleeved with the sliding block. When actual detection is carried out, the inner face of the wedge-shaped detection head can be in certain contact with the busbar, the detection head cannot be completely fixed on the busbar, and the pulley on the sliding block sleeve can be a detection device which can move randomly on the busbar, so that detection of different positions of the transformer busbar is facilitated.
(2) According to the method for detecting the leakage current of the heat-shrinkable insulating sheath, 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 the setting of threshold current to bee calling organ and pilot lamp, can be according to the leakage current of testing object bears the degree, in the allowed range, select the setting to the automatic alarm condition of difference. 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 the 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 the remote data transmission. The detection personnel do not need to carry out close-range manual detection, and power failure processing on the detection object is not needed during detection, so that the detection of leakage current in the running state is realized.
Drawings
FIG. 1 is a sectional view showing 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 the wedge probe head and slider sleeve configuration.
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 method 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 on 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. A circular notch is formed in the center of one side, where the wedge-shaped probe 2 is installed, of the shell 1, 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 exposed part of the first current conductor 5 outside the shell 1 are covered with a primary insulating film 3, and the exposed part of the detection device in the air is protected against 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 be conveniently moved 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.
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, and the data information can be remotely transmitted to the mobile terminal of the control room by installing the wireless transmission module, so that theoretical basis and data support are provided for subsequent fault type identification research.
According to the invention, 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 check and overhaul the insulating sheath of the transformer busbar in time and efficiently, unnecessary economic loss is avoided, and the problems of difficult field monitoring, long power failure overhaul period and the like are effectively solved
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 present general concepts, in connection with the specific context of the scheme.
Claims (4)
1. A method for detecting leakage current of a thermal shrinkage insulation sheath is characterized by comprising the following steps: the device comprises a busbar (17) and a heat-shrinkable insulating sheath leakage current detection device, wherein the heat-shrinkable insulating sheath leakage current detection device comprises a shell (1), the left end and the right end of the shell (1) are respectively provided with a grounding wire (15) and a wedge-shaped detection head (2), the left end of the inner wall of the shell (1) is provided with a current detector (14), 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), the upper end of the first adapter (6) is electrically connected with an indicator lamp (9), the indicator lamp (9) penetrates through the upper wall of the shell (1), and the lower end of the first adapter (6) is connected with a buzzer (8), buzzer (8) run through the lower wall of shell (1), be provided with second adapter (10) in casing (1), the upper and lower both ends of second adapter (10) respectively with pilot lamp (9), buzzer (8) electric connection, second adapter (10) are through second current conductor (11) and current detector (14) electric connection, and the left pot head of wedge detecting head (2) is equipped with rubber ring (4), the right side of shell (1) is hugged closely in rubber ring (4), the inboard of the claw of wedge detecting head (2) is provided with slider cover (21), be provided with pulley (22) on the slider cover, the claw of wedge detecting head (2) passes through slider cover (21) and pulley (22) sliding connection on female arranging (17), including following step:
the method comprises the following steps: grounding the grounding wire (15);
step two: threshold currents of a buzzer (8) and an indicator lamp (9) are respectively set;
step three: the wedge-shaped probe head (2) is moved on the busbar (17);
step three: when the current passing through the buzzer (8) and the indicator lamp (9) exceeds the threshold current, the buzzer (8) and the indicator lamp (9) send out alarm signals.
2. The method for detecting the leakage current of the heat-shrinkable insulating sheath according to claim 1, wherein: and a third adapter (12) is arranged between the second current conductor (11) and the current detector (14).
3. The method for detecting the leakage current of the heat-shrinkable insulating sheath 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).
4. The method for detecting the leakage current of the heat-shrinkable insulating sheath according to claim 1, wherein: the data output end of the current detector (14) is electrically connected with a wireless data module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245422.XA CN114578198A (en) | 2022-03-14 | 2022-03-14 | Method for detecting leakage current of heat-shrinkable insulating sheath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245422.XA CN114578198A (en) | 2022-03-14 | 2022-03-14 | Method for detecting leakage current of heat-shrinkable insulating sheath |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114578198A true CN114578198A (en) | 2022-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210245422.XA Pending CN114578198A (en) | 2022-03-14 | 2022-03-14 | Method for detecting leakage current of heat-shrinkable insulating sheath |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114578198A (en) |
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2022
- 2022-03-14 CN CN202210245422.XA patent/CN114578198A/en active Pending
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