CN211263290U - Electrified detection device for cable accessory lead sealing electrical connection defect - Google Patents
Electrified detection device for cable accessory lead sealing electrical connection defect Download PDFInfo
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- CN211263290U CN211263290U CN201922022126.XU CN201922022126U CN211263290U CN 211263290 U CN211263290 U CN 211263290U CN 201922022126 U CN201922022126 U CN 201922022126U CN 211263290 U CN211263290 U CN 211263290U
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- 238000007789 sealing Methods 0.000 title claims abstract description 61
- 230000007547 defect Effects 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 230000008878 coupling Effects 0.000 claims abstract description 23
- 238000010168 coupling process Methods 0.000 claims abstract description 23
- 238000005859 coupling reaction Methods 0.000 claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 9
- 230000005291 magnetic effect Effects 0.000 abstract description 16
- 230000008859 change Effects 0.000 description 6
- 230000006698 induction Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a cable accessories seals plumbous electrical connection defect live detection device, include: the coupling injection signal source, the signal sensor and the signal display device are connected in sequence; the coupling injection signal source is used for injecting a current signal to the lead sealing of the cable accessory; the signal sensor is used for acquiring a plurality of induced electromotive forces on the surface of the lead sealing part of the cable accessory after current signals are injected; the signal display device is used for displaying the obtained plurality of induced electromotive forces. The difference of the magnetic field on the surface of the lead sealing is detected through the sensor, so that the electric connection defect of the lead sealing point part is detected in an electrified mode, the sensor axially moves 1 time along the lead sealing part of the cable accessory, the test work of the lead sealing electric connection can be completed, and the operation is flexible, simple and convenient.
Description
Technical Field
The utility model relates to an electrified detection device of cable accessories seal plumbous electrical connection defect belongs to power transmission and transformation equipment technical field.
Background
At present, poor lead sealing connection of cable accessories is easy to cause metal suspension discharge inside cable aluminum sheaths or cable accessories to cause cable faults. Because the cable accessory lead sealing outer part wraps up the pyrocondensation pipe, and its inboard contacts with tail pipe, aluminium sheath, can't see the inside lead sealing electrical connection condition with the naked eye, increased the degree of difficulty that lead sealing electrical connection detected. The traditional method mainly adopts an eddy current inspection method to detect the lead sealing defect of a cable accessory in the heat-shrinkable tube, the main principle of the method utilizes the difference of air and metal magnetic conductivity, when the surface of the lead sealing defect is cracked or seriously uneven, the change of induced voltage or induced current of a test coil is caused, and then the lead sealing defect is judged, but when the surface of the lead sealing part is smooth and the internal electrical connection has poor contact, the method has difficulty in detection, and the method needs a probe to slide along the surface of the lead sealing part, so that the operation is complex and the detection period is long.
SUMMERY OF THE UTILITY MODEL
The purpose is as follows: in order to overcome the not enough of existence among the prior art, the utility model provides a cable accessories seals plumbous electrical connection defect's electrified detection device can electrified inside plumbous electrical connection defect of sealing of detection cable, easy operation, convenience, efficient.
The technical scheme is as follows: in order to solve the technical problem, the utility model discloses a technical scheme does: the utility model provides a cable accessories seals plumbous electric connection defect live line detection device, includes: the coupling injection signal source, the signal sensor and the signal display device are connected in sequence;
the coupling injection signal source is used for injecting a current signal to the lead sealing of the cable accessory; the signal sensor is used for acquiring a plurality of induced electromotive forces on the surface of the lead sealing part of the cable accessory after current signals are injected; the signal display device is used for displaying the obtained plurality of induced electromotive forces.
Furthermore, the coupling injection signal source comprises a detachable feedthrough transformer and a signal generator which are connected with each other; the signal generator is used for sending a current signal to the detachable feedthrough transformer, the detachable feedthrough transformer is detachably mounted on the cable body aluminum sheath or the cable accessory grounding lead, and the signal sent by the signal generator is coupled and injected into the cable body aluminum sheath or the cable accessory grounding lead and is transmitted into the cable accessory lead sealing part.
Further, the signal types sent by the signal generator comprise a pulse signal, a rectangular wave type and a triangular wave signal.
Further, the signal sensor comprises a plurality of sensors; the sensors are sleeved on the surface of the lead sealing part of the cable accessory through steering knuckle buckles.
Furthermore, the sensor comprises a metal wire core and a coupling coil wound on the metal wire core; the knuckle is buckled and installed at two ends of the metal wire core.
Furthermore, a roller is further installed on one side of the sensor close to the lead sealing part of the cable accessory.
Furthermore, the signal sensor also comprises a test supporting rod, one end of the test supporting rod is mechanically connected with the sensor, and the other end of the test supporting rod is a handle.
The utility model has the advantages that: the coupling injection signal source is used for injecting a current signal to the lead sealing of the cable accessory; the signal sensor is used for acquiring a plurality of induced electromotive forces on the surface of the lead sealing part of the cable accessory after current signals are injected; the signal display device is used for displaying the obtained plurality of induced electromotive forces; the sensor is manufactured into a cylindrical shape to be coated on the lead sealing part of the cable accessory through steering of the steering knuckle buckle, and the cylindrical shape axially moves for 1 time along the lead sealing part of the cable accessory, so that the test work can be completed, and the device is flexible, simple and convenient to operate and has a good application prospect.
Drawings
FIG. 1 is an equivalent schematic diagram of a lead sealing crack of a cable accessory;
FIG. 2 is a schematic view of a magnetic line of force penetrating a sensor when the cable accessory is normal;
FIG. 3 is a schematic view of a magnetic line of force penetrating a sensor when a cable is attached with a crack defect;
FIG. 4 is a schematic structural diagram of a detecting device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a sensor configuration according to an embodiment of the present invention;
the meanings of the symbols in the figures: 1-coupled injection signal source, 101-detachable feedthrough transformer, 102-signal generator, 2-signal sensor, 201-sensor, 202-test support rod, 3-signal display device.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The cable accessory lead sealing is used for connecting accessory metal tubular components, such as an aluminum sheath and a terminal tail pipe, an aluminum sheath and a joint copper shell, and the lead sealing is also tubular.
The current signal that injects the known change of cable seal lead position and be different from power frequency current signal through cable accessories ground lead coupling, according to the biot-savart law, current signal can produce the change magnetic field at the seal lead surface, place the seal lead surface with coupling coil's signal sensor, according to Faraday's electromagnetic induction law, can produce induced electromotive force in the coupling coil, if seal lead position electrical connection is bad, then can change the homogeneity of coupling coil internal current distribution, change the homogeneity of seal lead position surface magnetic field simultaneously, detect the difference in seal lead position surface magnetic field through the sensor, thereby realize the electrified detection of seal lead position electrical connection defect.
Example 1:
as shown in fig. 4, the device for detecting the defect of the electrical connection of the lead-sealed electrical connector of the cable accessory comprises a coupling injection signal source 1, a signal sensor 2 and a signal display device 3 which are connected in sequence.
The coupling injection signal source 1 comprises a detachable feedthrough transformer 101 and a signal generator 102 which are connected with each other. The detachable core-penetrating transformer is provided with a clamping component for realizing the opening and closing of the core-penetrating transformer, and the detachable core-penetrating transformer is directly penetrated without changing an aluminum sheath of a cable body or a grounding lead structure of a cable accessory.
The detachable feedthrough transformer 101 is used for injecting a current signal which is changed and is different from a power frequency current signal into an aluminum sheath of a cable body or an accessory grounding lead, and the detachable feedthrough transformer 101 is connected with the signal generator 102 through a metal shielding connecting lead;
the signal emitted by the signal generator 102 is coupled to the cable body aluminum sheath or the cable accessory grounding lead by the detachable feedthrough transformer 101 according to the electromagnetic induction principle, and is transmitted to the cable accessory lead sealing part through the cable body aluminum sheath or the cable accessory grounding lead. The signal generator 102 may emit a pulse signal, a square wave type signal, a triangular wave signal.
The signal sensor 2 comprises a plurality of sensors 201 and a test support rod 202.
The sensors 201 are made into a cylindrical shape through steering of the steering knuckle buckles 20103 and sleeved on the surface of the lead sealing part of the cable accessory, and the cylindrical sensors can axially move 1 time along the surface of the lead sealing part of the cable accessory to test the magnetic induction electromotive force on the outer surface of the lead sealing part. The assembling quantity of the sensors can be determined according to the outer diameter of the lead sealing part of the cable accessory, and the sensors are flexibly assembled to complete the lead sealing part of the coated cable accessory. The signal sensor 2 is connected with the signal display device 3 through a radio frequency cable, and transmits a test signal to the signal display device. The number of the radio frequency cables is not less than 1, and is at least equal to the number of the sensors, and one radio frequency cable is connected with one sensor.
One end of the test supporting rod is mechanically connected with the sensor, the other end of the test supporting rod is a handle, and the position of the sensor for testing can be controlled through the handle.
As shown in fig. 5, the sensor 201 includes a metal wire core 20101, a coupling coil 20102 wound on the metal wire core;
the metal wire core 20101 and the coupling coil 20102 are used for inductively acquiring alternating coupling signals passing through the surface of the lead sealing part of the cable accessory. Preferably, the metal wire core 20101 is made of high-permeability material.
The steering knuckle buckles 20103 are mounted at two ends of the metal wire core 20101 of the sensor, are made of non-magnetic-conductive materials and can be connected in a tail-collecting mode and can steer.
The side, close to the lead sealing part of the cable accessory, of the sensor 201 is further provided with a roller 20104, and the roller slides in contact with the outer surface of the lead sealing part of the cable accessory in the testing process, so that friction can be reduced.
The signal display device 3 is connected with the signal sensor 2 through a data lead, receives the electric signal tested by the signal sensor 2 and displays data.
As shown in FIG. 1, the lead-sealed non-electrical connection of the cable affects the transmission path of the coupling current, and the lead-sealed part of the cable accessory is equivalent to a cylindrical tubular structure, and the electrical connection defect exists in FIG. 1.
Due to the magnetic effect of the current, a magnetic field is generated around the current channel in the tubular structure, and the magnitude of the magnetic field is related to the magnitude of the coupling injection current and the distance between the test point and the central axis of the current channel.
As shown in fig. 2 and 3, when the lead sealing component is cracked, the current channel is changed, the magnetic field intensity around the tubular structure is changed, and the lead sealing non-electrical connection defect can be detected and judged by detecting the change of the magnetic field or the magnetic induction intensity.
The using method comprises the following steps:
turning a plurality of sensors 201 through a knuckle buckle 20103 to form a cylindrical shape to surround the surface of a lead sealing part of a cable accessory, transmitting a signal sent by a signal generator 102 coupled and injected into a signal source 1 to an aluminum sheath of a cable body or a ground lead of the cable accessory inside the signal generator through a detachable feedthrough transformer 101, and transmitting a current signal to the lead sealing part of the cable accessory through the aluminum sheath of the cable body or the ground lead of the accessory;
the signal sensor is axially moved once along the lead sealing part of the cable accessory through the test support rod 202, and the induced potential U of the surface of the lead sealing part is obtained through each sensor in the moving processi，
UiThe induced potential of the sensor of the ith;
finding the maximum induced potential U of the sensormax＝Max(Ui) (ii) a Minimum induced potential U of the sensormin＝Min(Ui) (ii) a Considering errors caused by sensor angles, positions and the like, setting detection criteria as follows:
when | Umax-UminThe | is less than or equal to delta U, which indicates that the current channel in the cable lead sealing is axisymmetric and the lead sealing of the cable accessory is normal;
when | Umax-Umin|>Delta U, which indicates that the current channel in the cable lead sealing is not axisymmetric, and the lead sealing part of the cable accessory has electrical connection defect; Δ B is the error value in T due to the angle and position of the sensor; Δ U is the error value, in V, due to the sensor angle and position.
Example 2:
in the embodiment, 6 groups of sensors are adopted, namely N1, N2, N3, N4, N5 and N6 which are arranged in a lead sealing way relative to cable accessoriesDistances r from the center of the current path are set to r1、r2、r3、r4、r5、r6. The magnetic induction intensity passing through the center of the sensor was defined as the average magnetic induction intensity of the sensor as B1、B2、B3、B4、B5、B6Induced potentials are respectively set to U1、U2、U3、U4、U5、U6. The signal display device displays the induced potential read by the sensor.
In the embodiment, as shown in fig. 2, when the sensor detects the intervals of L1 and L3 as in fig. 2, the lead sealing of the cable accessories in the intervals of L1 and L3 is normal, because the sensor is symmetrical to the current channel axis and has the same model, namely r1＝r2＝r3＝r4＝r5＝r6And other parameters n, I and S are equal and are substituted into the formulas (1) and (2) to obtain B1＝B2＝B3＝B4＝B5＝B6；U1＝U2＝U3＝U4＝U5＝U6。
When | Bmax-Bmin0 or | Umax-UminAnd if | ═ 0, (in this case, Δ B ═ 0, and Δ U ═ 0) indicates that the cable accessory is sealed with lead and is free of defects.
When the sensor detects the interval as shown in L2, as shown in FIG. 3, the cable is broken in the interval L2, and the sensor is not axisymmetric with the current channel, i.e. r1≠r2＝r6≠r3＝r5≠r4Other parameters are equal and are substituted into the formulas (1) and (2) to obtain B1≠B2＝B6≠B3＝B5≠B4；U1≠U2＝U6≠U3＝U5≠U4，
When | Bmax-Bmin| not equal to 0 or | Umax-UminAnd | ≠ 0, which indicates that the lead sealing of the cable accessory is defective.
The utility model discloses a cable accessories seals plumbous electrical connection defect electrified detection device, but live working through coupling injection signal to cable body aluminum sheath or cable accessories ground lead to spread into cable accessories and seal plumbous position, and utilize signal sensor to seal plumbous position axial displacement 1 time along cable accessories, can accomplish test work, flexible operation, simple and convenient have good application prospect.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (7)
1. The utility model provides a cable accessories seals plumbous electric connection defect live line detection device which characterized in that: the method comprises the following steps: the coupling injection signal source, the signal sensor and the signal display device are connected in sequence;
the coupling injection signal source is used for injecting a current signal to the lead sealing of the cable accessory; the signal sensor is used for acquiring a plurality of induced electromotive forces on the surface of the lead sealing part of the cable accessory after current signals are injected; the signal display device is used for displaying the obtained plurality of induced electromotive forces.
2. The electrified detection device for the defect of the lead-sealed electrical connection of the cable accessory according to claim 1, wherein the coupling injection signal source comprises a detachable feedthrough transformer and a signal generator which are connected with each other; the signal generator is used for sending a current signal to the detachable feedthrough transformer, the detachable feedthrough transformer is detachably mounted on the cable body aluminum sheath or the cable accessory grounding lead, and the signal sent by the signal generator is coupled and injected into the cable body aluminum sheath or the cable accessory grounding lead and is transmitted into the cable accessory lead sealing part.
3. The apparatus according to claim 2, wherein the signal generator generates signals of pulse type, rectangular type and triangular type.
4. The apparatus for detecting the defect of the electrical connection between the lead sealing of the cable accessory as claimed in claim 1, wherein the signal sensor comprises a plurality of sensors; the sensors are sleeved on the surface of the lead sealing part of the cable accessory through steering knuckle buckles.
5. The device for detecting the electrified connection defect of the lead sealing electrical connection of the cable accessory as claimed in claim 4, wherein the sensor comprises a metal wire core and a coupling coil wound on the metal wire core; the knuckle is buckled and installed at two ends of the metal wire core.
6. The electrified detection device for the defect of the lead sealing electrical connection of the cable accessory as claimed in claim 4, wherein a roller is further installed on one side of the sensor close to the lead sealing position of the cable accessory.
7. The device for detecting the defects of the electrical connection between the lead sealing of the cable accessories and the cables as claimed in claim 4, wherein the signal sensor further comprises a test support rod, one end of the test support rod is mechanically connected with the sensor, and the other end of the test support rod is a handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922022126.XU CN211263290U (en) | 2019-11-21 | 2019-11-21 | Electrified detection device for cable accessory lead sealing electrical connection defect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922022126.XU CN211263290U (en) | 2019-11-21 | 2019-11-21 | Electrified detection device for cable accessory lead sealing electrical connection defect |
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| Publication Number | Publication Date |
|---|---|
| CN211263290U true CN211263290U (en) | 2020-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922022126.XU Active CN211263290U (en) | 2019-11-21 | 2019-11-21 | Electrified detection device for cable accessory lead sealing electrical connection defect |
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| Country | Link |
|---|---|
| CN (1) | CN211263290U (en) |
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- 2019-11-21 CN CN201922022126.XU patent/CN211263290U/en active Active
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