CN210323262U - Detection device is put in built-in metal forming office - Google Patents
Detection device is put in built-in metal forming office Download PDFInfo
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- CN210323262U CN210323262U CN201920649424.9U CN201920649424U CN210323262U CN 210323262 U CN210323262 U CN 210323262U CN 201920649424 U CN201920649424 U CN 201920649424U CN 210323262 U CN210323262 U CN 210323262U
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Abstract
The utility model relates to a cable detects technical field, more specifically relates to a detection device is put in built-in metal forming office. The built-in metal foil partial discharge detection device comprises a cable body, wherein a detection cabin is formed in the cable body, a sensor is arranged in the detection cabin, the sensor is electrically connected with a lead, and an interface used for being connected with an acquisition unit is arranged on the lead. The device is provided with the built-in metal foil sensor in the detection cabin, so that most of interference signals can be effectively shielded, and the sensitivity and accuracy of partial discharge detection are improved; the detection cabin is positioned at the ring cutting position of the metal sheath, does not involve artificial damage to an insulation shielding layer, a main insulation layer, a conductor shielding layer and a conductor of the cable body, and has higher safety than a true joint; when the device is used, only the two ends of the cable body are required to be connected with the cable to be detected, the interface is connected with the acquisition unit, a sensor is not required to be installed on site, the on-site detection is convenient, and the detection work efficiency is greatly improved.
Description
Technical Field
The utility model relates to a cable detects technical field, more specifically relates to a detection device is put in built-in metal forming office.
Background
Since the crosslinked polyethylene (XLPE) cable has the advantages of good insulating property, easy manufacture and installation, safe and reliable power supply, and being beneficial to beautifying cities, factories and mines, the crosslinked polyethylene (XLPE) cable has been rapidly developed since the early 60 s. For the last two decades, high voltage XLPE cables have been used in large numbers in main power grid systems. Crosslinked polyethylene cables may have air gaps and harmful impurities due to impurities in raw materials, or gaps between the insulating layer and the semiconductive shield layer or protrusions of the semiconductive body toward the insulating layer due to process reasons, and partial discharges are easily generated at the tips of these air gaps and impurities. Various insulation defects may also occur during installation and operation of the cable, resulting in partial discharges. Under the action of partial discharge, electro-thermal aging and aging of accessory materials are accelerated, and the accessory materials are accumulated to develop into an electric tree, so that the main insulation is finally broken down. The partial discharge detection device can be found and prevented in the early stage of equipment insulation deterioration, and system reliability and stability are improved.
So far, there are many methods for detecting partial discharge of high-voltage XLPE cables at home and abroad, such as a difference method, a directional coupling method, an electromagnetic coupling method, an ultra-high frequency inductive coupling method, and the like. The differential method is characterized in that a metal foil is pasted on the surface of a joint on site and the joint metal shield forms a capacitance sensor, the field use is long, and long-term professional experience is needed for testing and analysis. The electromagnetic coupling method is characterized in that partial discharge signals are extracted from a grounding wire and a cross-connection wire or a cable body by using high-frequency CT, and are influenced by strong noise, and the external partial discharge detection method can generate a detection result of misjudgment and missed judgment. The ultrahigh frequency inductive coupling method is a method for carrying out local discharge on-line detection on a spiral metal shielding cable by using a coil as a sensor, and the detection method requires that the metal shielding of the cable to be detected is formed by winding a spiral strip shape and cannot be used for domestic high-voltage cables. The directional coupling method needs to install a sensor in a cable joint, damages a sealing structure, easily leaves potential quality hazards during joint manufacturing and is rarely used.
Under the influence of strong noise and strong interference on site, the above method does not obtain an ideal detection effect. If the partial discharge detection device is built-in, the partial discharge detection device can be beneficial to noise resistance and interference resistance, so that a safe built-in partial discharge detection device needs to be designed in the face of site noise and interference.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome above-mentioned prior art at least one defect, provide a detection device is put in built-in metal forming office.
In order to solve the technical problem, the utility model discloses a technical scheme is: the built-in metal foil partial discharge detection device comprises a cable body, wherein a detection cabin is formed in the cable body, a sensor is arranged in the detection cabin, the sensor is electrically connected with a lead, and an interface used for being connected with an acquisition unit is arranged on the lead.
In this technical scheme, the cable body both ends of this device can be connected respectively and treat the cable, and the sensor is connected with the lead wire electricity, links to each other with pin connection's interface and acquisition unit, the utility model discloses a set up the sensor in detecting cabin, detecting cabin in the cable body, place the cable body in the sensor in, be favorable to reducing noise and the influence of interference to the testing result external in the testing process, the process of field installation sensor when having reduced the detection cable simultaneously has improved work efficiency.
Preferably, the cable body at least comprises an outer sheath, a metal sheath, an insulation shielding structure and a conductor from outside to inside.
Preferably, the detection chamber is formed at a ring cut off of the metal sheath. In the technical scheme, the metal sheath forms a detection cabin at the ring cutting cut-off position, on one hand, the processing mode of ring cutting is simple; on the other hand, the detection cabin is formed at the cutting position of the metal sheath ring, and the detection cabin is symmetrically arranged along the circumference of the metal sheath, so that the phenomenon of unbalanced electric field in the detection cabin is avoided, and the discharge characteristic is easy to appear.
Preferably, a metal shell in a half shape and a repair protection layer are sequentially arranged on the outer side of the detection cabin from inside to outside, the metal shell is fixedly welded with the metal sheath, and the repair protection layer is fixedly connected with the outer sheath. In the technical scheme, on one hand, the half-shaped metal shell can be used for conveniently sealing the sensor in the detection cabin to play a certain protection role; on the other hand, the influence of external noise and interference on the detection structure of the sensor can be prevented. The repair protective layer is fixedly connected with the protective sleeve and is used for protecting the metal shell and the internal detection cabin.
Preferably, the metal shell comprises an upper metal shell and a lower metal shell which are fixedly connected. In the technical scheme, the upper metal shell and the lower metal shell can be connected together in a welding mode and the like, so that the metal shell in the whole half shape is formed.
Preferably, the sensor is a metal foil sensor, the metal foil sensor is a monolithic electrode, and the electrode of the metal foil sensor is square. In the technical scheme, when the metal foil sensor is a single-chip electrode, the metal foil sensor has good effect; meanwhile, when the shape of the metal foil sensor is square, the metal foil sensor has good effect.
Preferably, a water blocking tape is arranged between the metal sheath and the insulation shielding structure. In the technical scheme, the water blocking tape is arranged to prevent liquid from penetrating into the insulation shielding structure.
Preferably, the insulation shielding structure comprises an insulation shielding layer, a main insulation layer and a conductor shielding layer from outside to inside. In the technical scheme, the insulating shielding layer plays a certain role in insulation and shielding; the main insulating layer plays an insulating role for the conductor; the conductor shielding layer plays a shielding role for the conductor.
Preferably, the upper metal shell and the lower metal shell are both of a non-magnetic material structure. In this technical scheme, upper portion metal casing and lower part metal casing are the non-magnetic material structure can prevent that upper portion metal casing and lower part metal casing from producing the electromagnetic field at the during operation to cause the influence to the data that the sensor detected.
Compared with the prior art, the beneficial effects are:
the device is provided with the built-in metal foil sensor in the detection cabin, so that most of interference signals can be effectively shielded, and the sensitivity and accuracy of partial discharge detection are improved; the detection cabin is positioned at the ring cutting position of the metal sheath, does not involve artificial damage to an insulation shielding layer, a main insulation layer, a conductor shielding layer and a conductor of the cable body, and has higher safety than a true joint; when the device is used, only the two ends of the cable body are required to be connected with the cable to be detected, the interface is connected with the acquisition unit, a sensor is not required to be installed on site, the on-site detection is convenient, and the detection work efficiency is greatly improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the cable body of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limiting the present patent, and those skilled in the art will understand the specific meaning of the terms according to their specific circumstances.
The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:
example 1
Fig. 1 to 2 show a first embodiment of a built-in metal foil partial discharge detection device, which includes a cable body 1, a detection cabin 2 is formed in the cable body 1, a sensor 3 is disposed in the detection cabin 2, the sensor 3 is electrically connected to a lead 4, and an interface 5 for accessing an acquisition unit is disposed on the lead 4. The utility model discloses a set up sensor 3 in detection cabin 2, the detection cabin 2 that sets up in cable body 1, place cable body 1 in with sensor 3 in, be favorable to reducing noise and the influence of interference to the testing result that are external in the testing process. It should be noted that the interface 5 may be a BNC interface, the interface 5 extends out of the inspection chamber 2, and the acquisition unit may be some other acquisition unit such as an oscilloscope. When the sensor 3 is mounted on the detection chamber 2, the sensor 3 needs to be insulated and protected from water.
The cable body 1 at least comprises an outer sheath 11, a metal sheath 12, an insulation shielding structure and a conductor 17 from outside to inside. A water-blocking tape 13 is arranged between the metal sheath 12 and the insulation shielding structure. The water-blocking tape 13 is provided to prevent liquid penetration into the insulation barrier structure. The insulation shield structure comprises an insulation shield layer 14, a main insulation layer 15 and a conductor shield layer 16 from outside to inside. The insulating shielding layer 14 plays a certain role in insulation and shielding; the main insulating layer 15 plays an insulating role for a conductor; the conductor shield 16 shields the conductor 17.
In addition, the test chamber 2 is formed at the ring-cut of the metal sheath 12. The metal sheath 12 forms the detection cabin 2 at the ring cutting position, on one hand, the processing mode of ring cutting is simple; on the other hand, the detection cabin 2 is formed at the ring cutting off position of the metal sheath 12, so that the phenomenon that the electric field in the detection cabin 2 is unbalanced when the detection cabin 2 is asymmetrically distributed on the metal sheath 12 is avoided, and the discharge characteristic is easy to appear. Specifically, when the inspection chamber 2 is formed by cutting a small portion along the circumference of the metal sheath 12, the inspection chamber 2 cannot be symmetrically arranged along the circumference of the metal sheath 12, which may cause an uneven distribution of the electric field inside the metal sheath 12, thereby causing a discharge phenomenon. In order to avoid the discharge phenomenon of the metal sheath 12, the metal sheath 12 is cut off along the entire circumference thereof and the detection chamber 2 is formed, so that the discharge phenomenon of the metal sheath 12 can be effectively avoided.
The detection cabin 2 is provided with a half-shaped metal shell 6 and a repair protective layer 7 from inside to outside in sequence, the metal shell 6 is fixedly welded with a metal sheath 12, and the repair protective layer 7 is fixedly connected with an outer sheath 11. The half-shaped metal shell 6 can be used for sealing the sensor 3 in the detection cabin 2 to play a certain protection role; on the other hand, the influence of external noise and interference on the detection structure of the sensor 3 can be prevented. The repair protective layer 7 and the protective sleeve 11 can be fixedly connected by gluing and the like to protect the metal shell 6 and the internal detection cabin 2. It should be noted that, in this embodiment, the welding point 8 between the metal sheath 12 and the metal shell 6 is further provided with a small section of the metal sheath 12 at a distance from the circular cut-off of the metal sheath 12, and specifically, the metal shell 6 is not directly welded to the circular cut-off of the metal sheath 12, so that the welding position is selected to form a stress cone, thereby reducing the phenomenon of magnetic field concentration and ensuring the safe operation of the cable body 1.
In addition, the metal shell 6 includes an upper metal shell 61 and a lower metal shell 62 fixedly connected. The upper metal shell 61 and the lower metal shell 62 may be joined together by welding or the like, thereby forming the entire huff-shaped metal shell 6.
The sensor 2 is a metal foil sensor, the metal foil sensor is a single-chip electrode, and the electrode of the metal foil sensor is square. When the metal foil sensor is a single-chip electrode, the metal foil sensor has good effect; meanwhile, when the shape of the metal foil sensor is square, the metal foil sensor has good effect.
In addition, the upper metal shell 61 and the lower metal shell 62 are both made of non-magnetic materials. The upper metal shell 61 and the lower metal shell 62 are made of non-magnetic materials, so that an electromagnetic field generated by the upper metal shell 61 and the lower metal shell 62 during operation can be prevented, and the data detected by the sensor 3 can be influenced.
The specific working principle is that two ends of a cable body 1 are respectively connected with a cable to be tested through connectors, and an interface 5 is connected with an oscilloscope; and partial discharge detection can be carried out on the cable to be detected through data detected by the oscilloscope.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides a detection device is put in built-in metal forming office which characterized in that: the cable comprises a cable body (1), a detection cabin (2) is formed in the cable body (1), a sensor (3) is arranged in the detection cabin (2), a lead (4) is electrically connected with the sensor (3), and an interface (5) used for being connected into an acquisition unit is arranged on the lead (4).
2. The built-in metal foil partial discharge detection device according to claim 1, wherein: the cable body (1) at least comprises an outer sheath (11), a metal sheath (12), an insulation shielding structure and a conductor (17) from outside to inside.
3. The built-in metal foil partial discharge detection device according to claim 2, wherein: the detection cabin (2) is formed at the ring-cut-off position of the metal sheath (12).
4. The built-in metal foil partial discharge detection device according to claim 3, wherein: the detection cabin (2) is provided with a half-shaped metal shell (6) and a repairing protective layer (7) from inside to outside in sequence, the metal shell (6) is fixedly welded with the metal sheath (12), and the repairing protective layer (7) is fixedly connected with the outer sheath (11).
5. The built-in metal foil partial discharge detection device according to claim 4, wherein: the metal shell (6) comprises an upper metal shell (61) and a lower metal shell (62) which are fixedly connected.
6. The built-in metal foil partial discharge detection device according to any one of claims 1 to 5, wherein: the sensor (3) is a metal foil sensor, the metal foil sensor is a single-chip electrode, and the electrode of the metal foil sensor is square.
7. The built-in metal foil partial discharge detection device according to claim 2, wherein: and a water blocking tape (13) is arranged between the metal sheath (12) and the insulation shielding structure.
8. The built-in metal foil partial discharge detection device according to claim 7, wherein: the insulation shielding structure comprises an insulation shielding layer (14), a main insulation layer (15) and a conductor shielding layer (16) from outside to inside.
9. The built-in metal foil partial discharge detection device according to claim 5, wherein: the upper metal shell (61) and the lower metal shell (62) are both of a non-magnetic material structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920649424.9U CN210323262U (en) | 2019-05-07 | 2019-05-07 | Detection device is put in built-in metal forming office |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920649424.9U CN210323262U (en) | 2019-05-07 | 2019-05-07 | Detection device is put in built-in metal forming office |
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| CN210323262U true CN210323262U (en) | 2020-04-14 |
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| CN201920649424.9U Active CN210323262U (en) | 2019-05-07 | 2019-05-07 | Detection device is put in built-in metal forming office |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781472A (en) * | 2020-07-16 | 2020-10-16 | 广东电网有限责任公司 | Built-in detection device for detecting partial discharge and installation method thereof |
| CN111880058A (en) * | 2020-07-31 | 2020-11-03 | 广东电网有限责任公司 | Vehicle-mounted mobile partial discharge detection system and detection method thereof |
| CN111880065A (en) * | 2020-07-16 | 2020-11-03 | 广东电网有限责任公司 | Built-in metal foil electrode sensor and preparation method thereof |
| CN112557855A (en) * | 2020-12-23 | 2021-03-26 | 武汉华威众科电力有限公司 | On-line partial discharge shielding type sensor and implementation method thereof |
-
2019
- 2019-05-07 CN CN201920649424.9U patent/CN210323262U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781472A (en) * | 2020-07-16 | 2020-10-16 | 广东电网有限责任公司 | Built-in detection device for detecting partial discharge and installation method thereof |
| CN111880065A (en) * | 2020-07-16 | 2020-11-03 | 广东电网有限责任公司 | Built-in metal foil electrode sensor and preparation method thereof |
| CN111880058A (en) * | 2020-07-31 | 2020-11-03 | 广东电网有限责任公司 | Vehicle-mounted mobile partial discharge detection system and detection method thereof |
| CN111880058B (en) * | 2020-07-31 | 2023-01-24 | 广东电网有限责任公司 | Detection method applied to vehicle-mounted mobile partial discharge detection system |
| CN112557855A (en) * | 2020-12-23 | 2021-03-26 | 武汉华威众科电力有限公司 | On-line partial discharge shielding type sensor and implementation method thereof |
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