CN201178137Y - Distribution network safety protection grounding device - Google Patents

Abstract

A grounding device for distribution network safety protection, which fundamentally solves the problems of poor corrosion resistance and high hidden dangers in equipment operation existing in existing grounding devices, including grounding down conductors on the ground and grounding bodies underground. The technical points Yes: The grounding down conductor is composed of a metal conductor core wire and a one-time injection-molded insulation protection layer covering its outer circumference. Anti-corrosion conductive wires are installed on the upper and lower ends of the metal conductor core wire to the outer surface extending to the inner cavity end of the insulation protection layer. layer, the lower end of the metal conductor core wire is welded together with the metal grounding electrode or metal connecting strip of the grounding body, and the lower end of the core wire is welded to the metal grounding electrode or the metal connecting strip, and the metal grounding electrode and the metal connecting strip are welded together. An anti-corrosion conductive layer is provided at the weld seam respectively. It has the characteristics of reasonable structural design, reliable grounding, safe use, convenient detection, simple maintenance, significantly improved insulation, anti-corrosion performance and extended service life, which is conducive to personal safety and safe operation of distribution network.

Description

Distribution network safety protection grounding device

technical field

The utility model relates to a grounding device for power distribution equipment in a distribution network, in particular to a safety protection grounding device for a distribution network.

Background technique

At present, pole-mounted switches, ring network switches, lightning protection devices, distribution transformers and other power distribution equipment grounding and low-voltage distribution lines of urban and rural medium and low-voltage distribution networks, power line entry points and repetitions of factories, high-rise buildings, etc. Grounding points, etc., must be equipped with grounding devices according to regulations and specifications. The grounding device is mainly composed of two parts: the grounding downconductor on the ground and the grounding electrode underground.

The existing grounding down conductors generally adopt steel strands, exposed steel bars, iron strands, flat steel or copper-aluminum wires, etc., and most of the connection points between the down conductors and the grounding poles are directly fastened with bolts. Due to the serious corrosion of the conductors under these grounding leads, the corrosion of the bolts is easy to loosen, and the poor contact of the connection points not only increases the resistance, but also easily damages the safety protection grounding of the distribution network or loses the grounding rod, especially in the event of line faults, lightning attacks and Under unexpected circumstances such as disconnection of the down conductor, it will bring great hidden dangers to personal safety and equipment operation, and endanger the safe operation of the distribution network. Moreover, the specifications of various grounding down conductors are not uniform, and the appearance is not beautiful, which sometimes affects traffic.

The existing grounding electrodes are welded on-site using angle steel or steel pipes and buried underground. After installation, the grounding resistance is tested to be less than the specified value to be qualified. However, the concealed works buried underground will be severely corroded after a period of time, and the corrosion rate is very fast, and the grounding effect will be greatly reduced after a few years. The reason is that the anti-corrosion ability of the grounding device is poor, the anti-corrosion galvanized layer is easily corroded underground, and the spot welds welded on site are not anti-corrosion. It is very difficult to overhaul the hidden project, and in this case it also brings great hidden dangers to personal safety and equipment operation.

The designer once aimed at the hidden dangers of the existing grounding device, and set up a kind of "insulation protection grounding down conductor" (patent announcement number is CN2520573Y), according to the higher and higher requirements for grounding quality of power distribution technology and power distribution equipment , basically comply with the regulations and specifications of the relevant standards for grounding devices, and realize the reliable operation and safe power supply of power distribution equipment vigorously advocated by the power department. However, in practical applications, it is found that it still has unsatisfactory features, that is, the junction between the upper end of the metal core wire and the end of the insulating protective layer is easily damaged when the bare end of the metal core wire is coated with galvanized coating, and water or The entry of moist gas into the inner cavity of the insulating protective layer will also cause corrosion of the core wire and affect the protective grounding effect. Therefore, the hidden dangers of the above-mentioned grounding device should be improved in time.

Utility model content

The purpose of this utility model is to provide a distribution network safety protection grounding device, which fundamentally solves the problems of poor anti-corrosion ability and large hidden dangers in equipment operation existing in the existing grounding device. Safety, convenient detection, simple maintenance, significantly improved its insulation, anti-corrosion performance and extended service life, which is conducive to personal safety and safe operation of distribution network.

The purpose of this utility model is achieved in this way: the device includes the grounding down conductor of the ground part and the grounding body of the underground part. Injection-molded insulating protective layer is formed. An anti-corrosion conductive layer is provided on the upper and lower ends of the metal conductor core wire to the outer surface extending to the inner cavity end of the insulating protective layer. The grounding body is composed of a metal grounding electrode and a metal connecting each metal grounding The lower end of the metal conductor core wire is welded together with the metal ground electrode or the metal connection strip of the grounding body, and at the welding seam between the lower end of the metal conductor core wire and the metal ground electrode or the metal connection strip, An anti-corrosion conductive layer is respectively arranged at the welding seam of the metal ground electrode and the metal connection strip.

Because the grounding down conductor of the grounding device of the present invention is composed of a metal conductor core wire and a one-time injection-molded insulating protective layer covering its outer periphery, it is welded together with the metal grounding electrode or metal connection strip of the grounding body, and the metal conductor core An anti-corrosion conductive layer is provided from the upper and lower ends of the wire to the outer surface extending to the end of the inner cavity of the insulating protective layer. Therefore, when coating and welding the bare end of the metal core wire, the distance from the end of the metal core wire to the end of the insulating protective layer The junction is not easily damaged. Since the upper exposed end of the metal conductor core wire and its lower exposed end are connected to the metal ground electrode or the metal connection strip, and the metal ground electrode and the metal connection strip are provided with an anti-corrosion conductive layer, it can play a long-term role. Antiseptic effect. Therefore, the structural design of the device is reasonable, which can ensure that the connection points of each piece are firmly connected and in good contact, and can fundamentally solve the problems of poor corrosion resistance, poor contact of the connection points, and damage to the safety protection grounding of the distribution network in the existing grounding device. Problems such as loss of grounding rods and high hidden dangers in equipment operation, etc., and the specifications are unified to increase the appearance aesthetics of the connection with the power distribution equipment. The device is not only reliable in grounding, safe in use, easy to install, easy to detect, easy to maintain, and achieves the purpose of maintenance-free and anti-theft, but also significantly improves its insulation and anti-corrosion performance and prolongs its service life, which is conducive to personal safety and safe operation of the distribution network.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a kind of specific structure schematic diagram of the utility model.

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a specific structural diagram of the utility model with a crimping plate.

1. Metal conductor core wire, 2. Insulation protection layer, 3. Metal grounding electrode, 4. Metal connection strip, 5. Crimp plate.

Detailed ways

The concrete structure of the present utility model is explained in detail according to Fig. 1-3. The device includes the grounding down conductor of the ground part and the anti-corrosion grounding body of the underground part. The grounding down conductor connected with the power distribution equipment is composed of a metal conductor core wire 1 and an insulating protective layer 2 made of polyethylene or cross-linked polyethylene and other materials covering its outer periphery by one-time injection molding. The upper and lower ends of the metal conductor core wire 1 are provided with an anti-corrosion conductive layer on the outer surface extending to the end of the inner cavity of the insulating protective layer 2. When the bare end of the metal conductor core wire 1 is coated and welded, the metal conductor core wire 1 The junction between the end of the insulation protection layer and the end of the insulation protection layer 2 is not easy to damage, and can effectively prevent water or moist gas from entering the inner cavity of the insulation protection layer to cause core wire corrosion. The underground anti-corrosion grounding body is composed of metal grounding electrodes 3 and metal connection strips 4 connecting the metal grounding electrodes 3 . The specifications of the metal conductor core wire 1 can be determined according to actual needs. The insulating protective layer 2 is made of insulating materials such as polyethylene or cross-linked polyethylene, and the thickness of the insulating protective layer 2 is selected according to the protection requirements. The anti-corrosion conductive layer provided on the outer surface of the upper and lower ends of the metal conductor core wire 1 makes it easier to firmly connect with the grounding lead wire of the power distribution equipment and the underground grounding body respectively.

The metal grounding electrode 3 and the metal connection strip 4 of the underground anti-corrosion grounding body are made of metal profiles, such as angle steel, flat steel or round steel, and their specifications, sizes and quantities should be determined according to actual needs. The metal conductor core wire 1 can be welded integrally with the metal grounding electrode 3 of the anti-corrosion grounding body, and also can be welded integrally with the metal connecting strip 4 . And at the upper exposed end of the metal conductor core wire 1, at the welding seam between the lower exposed end of the metal conductor core wire 1 and the metal grounding electrode 3 or the metal connecting strip 4, and at the welding seam between the metal grounding electrode 3 and the metal connecting strip 4 Use electroplating or brushing anti-corrosion and conductive materials, and set up anti-corrosion conductive layers to ensure that the whole set of grounding devices has good anti-corrosion and conductive properties.

In field application, the grounding device can be manufactured into single grounding body type, double grounding body type or double grounding body and double lead down conductor type according to the requirements of different grounding places according to the regulations and specifications. The upper end of the metal conductor core wire 1 is welded firmly. The upper end of the down conductor can also be manufactured into a pattern with a crimping plate 5 (as shown in Figure 3). The existing grounding device can also be modified by using the grounding down conductor. During the transformation operation, dig under the ground surface of the ground point to the original metal ground electrode, weld the lower end of the metal conductor core wire 1 with the original ground electrode buried below the ground surface, and coat the weld seam with anti-corrosion and conductive The material forms an anti-corrosion conductive layer, and after backfilling with soil, the upper end of the metal conductor core wire 1 can be connected to the ground lead of the power distribution equipment.

Claims (1)

1, a kind of power distribution network security protection earthing device, the ground connection that comprises aerial part is drawn lower conductor, the earth electrode of under ground portion, it is characterized in that: described ground connection is drawn lower conductor and is made of metallic conductor heart yearn and the insulating protective layer that coats the single injection-molded of its periphery, on the metallic conductor heart yearn, bottom to the outer surface that extends to insulating protective layer inner chamber end is provided with anticorrosion conductive layer, described earth electrode is made up of with the metal joining strips that is connected each metal earth electrode the metal earth electrode, the metal earth electrode or the metal joining strips of the lower end of described metallic conductor heart yearn and described earth electrode are integrally welded, and in the lower end of metallic conductor heart yearn and the commissure of metal earth electrode or metal joining strips, the commissure of metal earth electrode and metal joining strips is provided with anticorrosion conductive layer respectively.

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