CN203826910U - A 10KV distribution transformer pillar type puncture grounding composite zinc oxide lightning arrester - Google Patents

Abstract

The utility model discloses a 10kV distribution transformer pillar-type puncture ground composite zinc oxide arrester. The high-voltage line of the 10kV distribution transformer is led out from the transformer through the pillar-type arrester and connected to the gram. The top of the pillar-type arrester is installed with a plate-like Connecting iron, one end of the connecting iron is fixed with a puncture wire clamp, and the opposite end of the connecting iron is vertically fixed with a grounding screw. During construction and installation, the insulated down conductor passes through the puncture wire clamp and the The clamp forms an electrical connection with the post-type surge arrester, and the grounding wire is hung on the grounding screw to realize grounding protection. The utility model satisfies the functions of grounding, support and lightning arrester at the same time, and achieves the purposes of simplifying installation, increasing electrical safety performance, reducing maintenance blackout time, improving power supply reliability, and reducing operation and maintenance costs.

Description

A 10kV Distribution Transformer Pillar Type Piercing Ground Composite Zinc Oxide Arrester

technical field

The utility model relates to a lightning arrester.

Background technique

Surge arresters are important protective equipment used to protect medium-voltage distribution network lines and equipment from atmospheric overvoltage and operating overvoltage damage. At present, AC gapless metal oxide arresters are widely used.

Among them, the pillar type arrester has the advantages of small size, light weight, easy installation, and pollution flashover resistance. According to the statistical analysis, the construction and installation speed has been improved and the power outage time has been shortened after using the pillar type arrester. However, in the process of operation and maintenance, it was found that the device has shortcomings: in the case of a power outage at the terminal of the distribution station area, it is not convenient to connect the ground wire, and the power outage maintenance operation of the distribution transformer needs to be connected to the ground wire on the high-voltage line. This expands the scope of power outages, which is not conducive to the improvement of power supply reliability and high-quality service levels. And try to install the grounding ring directly on the high voltage down conductor, but considering that the grounding wire is heavy, the down conductor is thinner, and the mechanical strength of the insulated wire is not enough, after disassembling the grounding wire for many times, the pile head of Lingke will be loosened , causing a safety hazard.

Utility model content

The technical problem to be solved by the utility model is to provide a 10kV distribution transformer pillar type puncture grounding composite zinc oxide arrester, which is convenient for the distribution transformer power failure inspection and maintenance to hang the grounding wire, and the insulating down conductor directly passes through the puncture wire clamp without Breaking to achieve the purpose of simplifying installation, increasing electrical safety performance, reducing maintenance power outage time, and improving power supply reliability.

In order to solve the above technical problems, the utility model adopts the following technical scheme: a 10kV distribution transformer pillar type puncture ground composite zinc oxide arrester. A plate-shaped connecting iron is installed on the top of the connecting iron through bolts. One end of the connecting iron is fixed with a piercing wire clamp. The connecting iron is vertically fixed with a grounding screw at the opposite end of the piercing wire clamp. Pass through the piercing wire clip, and form an electrical connection with the pillar type arrester through the piercing wire clip, and hang the grounding wire on the grounding screw to realize grounding protection.

Preferably, an insulating sleeve is sleeved on the ground screw.

Preferably, the connecting iron is hinged with a protective cover covering the puncture wire clamp and the grounding screw, and the protective cover is provided with an operating head for hooking the insulating operating rod.

Preferably, the puncture clamp includes a clamp body fixed on the connecting iron by bolts, a semicircular groove is arranged on the upper part of the clamp body, a puncture body is installed above the clamp body, and the puncture The bottom of the body is provided with punctures corresponding to the groove positions.

The utility model is improved on the basis of the structure of the original pillar type lightning arrester. The top connecting iron of the pillar type lightning arrester is fixed with a puncture clamp and a grounding screw at the same time. After the structure is improved, the insulating down conductor does not need to be disconnected during construction and installation The insulated down conductor can directly pass through the puncture clamp, and form an electrical connection with the arrester body through the puncture clamp. At the same time, the grounding screw fixed on the other end of the connecting iron separately realizes the requirement of hanging the grounding wire when the distribution transformer is powered off for maintenance. . So as to meet the grounding function, support function, and arrester function at the same time, and achieve the purpose of simplifying installation, increasing electrical safety performance, reducing maintenance outage time, improving power supply reliability, and reducing operation and maintenance costs.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is further described:

Figure 1 is a schematic diagram of the installation structure of the pillar type arrester;

Figure 2 is an enlarged view of A in Figure 1;

Fig. 3 is a structural schematic diagram of a pillar type arrester.

Detailed ways

Firstly, the 10kV distribution transformer post-type piercing ground composite zinc oxide arrester will be described in detail in conjunction with Figures 1 to 3. The high-voltage line of the 10kV distribution transformer is drawn from the transformer 3 through the post-type arrester 1 and connected to the order 2. The post-type arrester 1 includes The main body 11, the main body 11 includes a core body and an insulating cylinder wrapped outside the core body, and a silicone rubber composite jacket formed by one-time vulcanization is placed on the outer surface of the insulating cylinder. The top of the pillar type lightning arrester 1 is equipped with a plate-shaped connecting iron through bolts, one end of the connecting iron is fixed with a piercing wire clamp 12, and the connecting iron is vertically fixed with a grounding screw 13 at the opposite end of the piercing wire clamp. During construction and installation, the insulated down conductor passes through the piercing wire clamp 12 to form an electrical connection with the post type arrester 1 through the piercing wire clip, and the grounding wire is hung on the grounding screw 13 to realize grounding protection.

An insulating sleeve is sleeved on the ground screw. A protective cover covering the puncture wire clamp and the grounding screw is hinged on the connecting iron. The protective cover is provided with an operating head for hooking the insulating operating rod, and the protective cover is opened or closed by the insulating operating rod.

The puncture wire clip includes a wire clip body 120 fixed on the connecting iron by bolts, a semicircular groove is provided on the top of the wire clip body, a puncture body 121 is installed above the wire clip body, and the puncture body The bottom is provided with a puncture corresponding to the groove position.

When the distribution transformer is powered off for maintenance, the insulated down conductor can directly pass through the puncture clamp, and form an electrical connection with the arrester body through the puncture clamp. In addition, since the grounding screw is separately fixed on the connecting iron, the mechanical strength required for hanging the grounding wire can be ensured.

The utility model integrates the four functions of a post insulator, a puncture wire clip, a grounding ring and a lightning arrester, and its structure greatly simplifies the type of the pole-mounted device in the distribution station area. The operation experience shows that the distribution transformer pillar type puncture ground composite zinc oxide arrester can withstand the test of various severe weather such as lightning, high temperature, rainstorm, typhoon, heavy fog and low temperature. In the equipment failure statistics, the failure rate of the distribution transformer arrester is lower than that of the ordinary zinc oxide arrester, and the trial has achieved satisfactory results.

The beneficial effect after adopting the utility model:

(1) Significant effect on distribution transformer lightning protection

Statistics show that after the popularization of distribution transformer pillar type puncture grounding composite zinc oxide arrester, the lightning damage rate of distribution transformer has been decreasing year by year, indicating that the new distribution transformer arrester not only realizes the pillar insulation function and grounding function, but also effectively protects the transformer. , Reduce the number of times the distribution transformer is damaged by lightning strikes.

(2) Shorten installation time and improve construction efficiency analysis

Calculated based on the company's 300 station area expansion points per year, compared with the independent installation of post insulators, lightning arresters, and grounding rings, each station area can save at least half an hour of man-hours. Assuming that each station area construction needs to arrange 6 technicians and 4 small workers . Man-hours can be saved every year: 300*0.5*(6+4)=1500 man-hours.

(3) Reduce the number of households during power outages and improve the analysis of power supply reliability

a. Calculated based on the company’s annual capacity expansion of 300 stations, each station can save at least half an hour. Assuming that the construction of each station stops 5 users on average, the number of households that can be saved each year: 300*0.5*5=750 Time households.

b. At present, there are 3,455 distribution stations in the company, and 60% of the stations have adopted the pillar arrester for standardized transformation. Assume that the power distribution station area is cut off once every two years for maintenance, and each time the power is cut off for 2 hours. If the distribution transformer arrester is not installed, the distribution transformer maintenance needs to cut off the power and ground the high-voltage branch line, and an average of 5 users need to be stopped. Let gram, the number of outage users is 1. The number of hourly households can be saved every year: 3455*60%*0.5*2*(5-1)=8292 hourly households, which effectively improves the reliability of power supply.

Claims (4)

1. 10kV distribution transforming column support type puncture ground connection composite zinc oxide lightning arrester, the high-voltage line of 10kV distribution transforming is drawn through column support type lightning arrester (1) and connects crane (2) from transformer (3), it is characterized in that: the top of described column support type lightning arrester (1) is provided with a tabular connection iron by bolt, one end of described connection iron is fixed with penetrating cable clamp (12), described connection iron is vertically fixed with grounding screw rod (13) in the opposite end of penetrating cable clamp, when construction and installation, insulation downlead is through penetrating cable clamp (12), by penetrating cable clamp and this column support type lightning arrester (1), form electrical connection, on grounding screw rod (13), hang earth connection and be grounded protection.

2. a kind of 10kV distribution transforming column support type puncture ground connection composite zinc oxide lightning arrester according to claim 1, is characterized in that: on described grounding screw rod, be socketed with insulating sleeve.

3. a kind of 10kV distribution transforming column support type puncture ground connection composite zinc oxide lightning arrester according to claim 2, it is characterized in that: on described connection iron, be hinged with a protective cover that penetrating cable clamp and grounding screw rod are covered, described protective cover is provided with the operating head for insulating bar hook.

4. a kind of 10kV distribution transforming column support type puncture ground connection composite zinc oxide lightning arrester according to claim 1, it is characterized in that: described penetrating cable clamp comprises the wire clip body (120) being secured by bolts on connection iron, described wire clip body top is provided with semicircular groove, described wire clip body top is provided with puncture body (121), and respective slot position, described puncture body bottom is provided with puncture.