CN210894581U - A ground connection case subassembly for partial discharge test - Google Patents

Abstract

The utility model provides a ground connection case subassembly for partial discharge test. The utility model provides a grounding box subassembly for partial discharge test, wherein, includes grounding box main part, physics isolation storehouse, BNC output module, is used for preventing outside high pressure and surge impact's surge impact prevention module, BNC input module is connected with surge impact prevention module electricity, surge impact prevention module with BNC output module electricity is connected, BNC output module, surge impact prevention module and BNC input module all are located in the physics isolation storehouse, physics isolation storehouse is located inside grounding box main part. The utility model discloses a built-in sensor of cable provides a safe and reliable's signal transmission earthing box subassembly, makes partial discharge detect simpler, easy operation.

Description

A ground connection case subassembly for partial discharge test

Technical Field

The utility model relates to an earth connection case technical field, more specifically relates to an earth connection case subassembly for partial discharge test.

Background

The degree of the urban power grid cabling is an important mark for measuring the technical level of the urban power grid, and is also a necessary means for promoting the rapid advance of the urban civilization process and improving the urban living environment. In order to ensure the safe operation of the power cable, a cable test is taken as a main means of operation and maintenance, and the cable test can be divided into an online test and an offline test according to a test mode. However, the off-line test mode cannot acquire the running state of the cable, and the high-voltage cable partial discharge detection technology has been used as a main means for the non-destructive electrical inspection of the cable insulation as the on-line monitoring technology is continuously developed. By means of the high-speed development of the cable technology and the advanced and mature diagnosis method and detection equipment, the hidden cable trouble can be prevented in advance, the fault loss is reduced, the cable defect searching efficiency is improved, and the power supply and utilization safety is guaranteed.

At present, many means for detecting local discharge of high-voltage XLPE cables at home and abroad exist, but a typical local discharge detection device cannot be used reliably for a long time due to the fact that the operation environment of the cable is severe. Chinese patent publication No. CN207705747U, published as 2018, 8.7.8, discloses a cross-connected grounding box with a partial discharge detection function, which includes a box body and a box cover, wherein the box body is provided with a ground wire interface end and each interface end on the outside, and a ground wire connection bar, each phase connection bar and a cross-connected wiring bar inside the box body.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome because the cable operational environment is abominable, lead to the unreliable shortcoming of signal transmission of partial discharge detection, provide a ground connection case subassembly for the partial discharge test.

In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a ground connection subassembly for partial discharge experiment, wherein, includes ground connection case main part, physics isolation storehouse, BNC output module, is used for preventing outside high pressure and surge impact's anti-surge impact module, BNC input module is connected with anti-surge impact module electricity, anti-surge impact module with BNC output module electricity is connected, BNC output module, anti-surge impact module and BNC input module all are located in physics isolation storehouse, physics isolation storehouse is located inside the ground connection case main part. The wiring of the sensor arranged in the cable is connected with the BNC input module in the technical scheme, the signal of the sensor is input from the BNC input module and flows through the anti-surge protection module, the anti-surge protection module prevents external high voltage and surge impact and protects the internal circuit of the junction box, and the anti-surge protection module is electrically connected with the BNC output module; the BNC output module, the surge impact prevention module and the BNC input module are all positioned in the physical isolation bin, and the physical isolation bin is arranged in the grounding box main body, so that the grounding box provides a storage place for the BNC output module, the surge impact prevention module and the BNC input module, and an external high-voltage oscilloscope can be directly and electrically connected with the BNC output module in the technical scheme to perform partial discharge detection.

Further, the BNC input module comprises at least one BNC input interface. The anti-surge impact module comprises at least one anti-surge protector, and each anti-surge protector is correspondingly and electrically connected with each BNC input interface. The BNC output module comprises at least one BNC output interface, and each BNC output interface is correspondingly and electrically connected with each anti-surge protector. The quantity of the BNC input interface, the anti-surge protector and the BNC output interface in the grounding box main body can be one or more, but the quantity of the BNC input interface, the anti-surge protector and the BNC output interface in the grounding box main body is the same, and each BNC input interface, the anti-surge protector and the BNC output interface form a complete independent signal transmission path.

Furthermore, the physical isolation bin physically isolates a transmission path formed by electrically connecting each BNC output interface, the anti-surge protector and the BNC input interface inside. The signals input by each BNC input interface come from the high-voltage cable with different phases, so that the physical isolation cabin is adopted in the grounding box for physical isolation to prevent interphase short circuit.

Further, the BNC input interface is located on a side surface of the grounding box body, and the BNC output interface is located on an upper surface of the grounding box body. The lead of the cable built-in sensor is directly inserted into a BNC input access port on the side surface of the grounding box, the high-voltage oscilloscope is directly inserted into a BNC output access port on the upper surface of the grounding box, and partial discharge detection is carried out on signals of the BNC output access port.

Furthermore, the BNC output interface is provided with a waterproof cap, when the BNC output interface is not detected, the waterproof cap is covered, when the BNC output interface is detected, the waterproof cap is taken down, and the waterproof cap is arranged to ensure that the BNC output interface does not enter water.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a set up BNC input module and BNC output module in the grounding box main part, make the grounding box become the signal transmission route that the cable partial discharge detected, make the partial discharge detection operation of built-in sensor cable simple; the circuit in the grounding box body is prevented from being impacted by high voltage and surge by arranging the surge impact prevention module; through set up physics isolation storehouse in ground connection case main part is inside, prevent alternate short circuit.

Drawings

Fig. 1 is the utility model discloses a structural schematic diagram of a ground connection case subassembly for partial discharge test.

Fig. 2 is a top view of the grounding box main body of the present invention.

Fig. 3 is a left side view of the utility model discloses grounding box.

The graphic symbols are illustrated as follows:

1-a physical isolation bin, 2-a BNC output module, 3-a surge impact prevention module, 4-a BNC input module, 5-a first built-in sensor, 6-a second built-in sensor and 7-a third built-in sensor.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts 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 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", 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 the 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 limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Example 1

Fig. 1 to 3 show a first embodiment of a grounding box assembly for partial discharge test according to the present invention. The utility model provides a grounding box subassembly for partial discharge test, wherein, includes that grounding box main part, physics keep apart storehouse 1, BNC output module 2, prevent surge impact module 3, BNC input module 4 is connected with prevent that surge impact module 3 is electric, prevents that surge impact module 3 is connected with BNC output module 2 electricity, BNC output module 2, prevent that surge impact module 3 and BNC input module 4 are located physics keep apart storehouse 1, physics keeps apart storehouse 1 and is located inside the grounding box main part.

The BNC input module 4 comprises a first BNC input interface, a second BNC input interface and a third BNC input interface; the surge impact prevention module 3 comprises a first surge protector, a second surge protector and a third surge protector, a first BNC input interface is electrically connected with the first surge protector, a second BNC input interface is electrically connected with the second surge protector, and a third BNC input interface is electrically connected with the third surge protector; BNC output module 2 includes first BNC output interface, second BNC output interface and third BNC output interface, and first BNC output interface is connected with first surge protector electricity of preventing, and second BNC output interface is connected with second surge protector electricity, and third BNC output interface is connected with third surge protector electricity.

In addition, the first BNC output interface, the second BNC output interface and the third BNC output interface are respectively provided with a waterproof cap, when the high-voltage oscilloscope is required to be detected, the waterproof caps are taken down, and when the high-voltage oscilloscope is not required to be detected, the waterproof caps are installed. The waterproof cap can prevent that BNC output interface from intaking, influences the inside circuit of ground connection case main part.

In addition, the BNC input module 4 is positioned on the side surface of the grounding box body, and the first, second and third BNC input interfaces of the BNC output module 2 are positioned on the upper surface of the grounding box. Because the signal that each BNC input interface input comes from the different looks of high tension cable, consequently, physics isolation storehouse 1 is with inside every BNC output interface, prevents that surge protector and BNC input interface electricity from connecting the transmission path who forms and carry out the physics isolation, prevents interphase short circuit.

The working principle of the embodiment is as follows: when the internal sensor is subjected to local discharge detection, the first built-in sensor 5 is electrically connected with the first BNC input interface, the second built-in sensor 6 is electrically connected with the second BNC input interface, the third built-in sensor 7 is electrically connected with the third BNC input interface, signals of the first, second and third built-in sensors are input into the grounding box body from the BNC input module 4, the waterproof caps of the first, second and third BNC output interfaces are removed, the high-voltage oscilloscope is electrically connected with different BNC output interfaces of the BNC output module 2, and then signals of different built-in sensors can be detected.

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 (7)

1. The utility model provides a ground connection case subassembly for partial discharge test which characterized in that: the anti-surge and anti-impact grounding box comprises a grounding box body, a physical isolation bin (1), a BNC output module (2), an anti-surge and anti-impact module (3) for preventing external high voltage and surge impact, and a BNC input module (4), wherein the BNC input module (4) is electrically connected with the anti-surge and anti-impact module (3), the anti-surge and anti-impact module (3) is electrically connected with the BNC output module (2), the anti-surge and anti-impact module (3) and the BNC input module (4) are all located in the physical isolation bin (1), and the physical isolation bin (1) is located inside the grounding box body.

2. A grounding box assembly for partial discharge testing as claimed in claim 1, wherein: the BNC input module (4) comprises at least one BNC input interface.

3. A grounding box assembly for partial discharge testing as claimed in claim 2, wherein: the surge impact prevention module (3) comprises at least one surge protector, and each surge protector is correspondingly and electrically connected with each BNC input interface.

4. A grounding box assembly for partial discharge testing as claimed in claim 3, wherein: the BNC output module (2) comprises at least one BNC output interface, and each BNC output interface is correspondingly and electrically connected with each anti-surge protector.

5. A grounding box assembly for partial discharge testing according to claim 4, wherein: the physical isolation bin (1) physically isolates a transmission path formed by electrically connecting each BNC output interface, the anti-surge protector and the BNC input interface inside.

6. A grounding box assembly for partial discharge testing according to claim 4, wherein: the BNC input interface is positioned on the side surface of the grounding box main body, and the BNC output interface is positioned on the upper surface of the grounding box main body.

7. The grounding box assembly for partial discharge tests as claimed in claim 6, wherein a waterproof cap is provided on each said BNC output port.

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