CN204614563U - A kind of asymmetric penetrating electrodes for Penetrative lightning arrester - Google Patents

Abstract

An asymmetric piercing electrode for a piercing arrester, the electrode is composed of a piercing wire clip (1), an arc guide foot (2) and an insulating cover (3). The piercing wire clip is installed on a 10kV insulated wire, The arc guide foot is installed under the 10kV insulated wire; the insulation cover (3) is set outside the puncture wire clamp (1) and the arc guide foot (2) after assembly, which can withstand a certain arc and solves the problem of high voltage puncture electrode insulation The wire is partially exposed and there is a problem of insulation defects. The puncture wire clamp is composed of upper pressure plate, middle pressure plate, lower pressure plate, backup nut and pressure nut; the upper side of the middle pressure plate and the lower side of the upper pressure plate have semicircular half-shaped teeth with triangular sharp teeth, which are used for clamping Insulate the wires. The utility model can guide the power-frequency continuous current arc to burn on itself through the asymmetrical arc guide foot when the arrester body is damaged and the gap breaks down again, and guide the arc not only to deviate from the wire, but also to drift outward away from the insulator.

Description

An Asymmetric Piercing Electrode for Piercing Arresters

technical field

The utility model belongs to the technical field of lightning protection for power distribution lines, and is suitable for lightning protection design when a puncture type lightning arrester protects power distribution lines, in particular to an asymmetric puncture electrode suitable for a puncture type lightning arrester.

Background technique

The power distribution line is the level closer to the user in the power system. It is responsible for the important responsibility of supplying power to industrial and agricultural production and residents' daily life. It has the characteristics of complex line structure, large number of lines, and wide coverage area. In the past, the idea of focusing on the main network and ignoring the distribution network existed for a long time, resulting in a large gap between the equipment status and technical level of the current distribution network compared with the main network. The insulation level of distribution lines is low, and there are generally no special lightning protection measures. Not only are they affected by direct lightning strikes, but also insulator flashovers occur due to the influence of induced overvoltages generated by lightning strikes on the ground. Compared with high-voltage transmission lines, distribution lines are more prone to lightning flashover tripping, which seriously affects the reliability of power supply.

With the improvement of the insulation rate of overhead conductors in my country's 10kV distribution network, the problem of lightning-strike disconnection of insulated conductors has become increasingly prominent, posing a great threat to power grid operation and personal safety. Installing a line-type arrester is an effective lightning protection measure. It releases lightning energy through a nonlinear resistor, suppresses power-frequency continuous current arcing, protects insulators from flashover, and prevents insulated wires from being disconnected by lightning. Therefore, line arresters are gradually widely used in distribution lines.

Line arresters include gapless and gapped structures.

When installing a gapless surge arrester, it is necessary to peel off a part of the insulated wire sheath, so that the wire is partially exposed, which will cause insulation and sealing defects, and the arrester body has been working under the operating voltage for a long time, and there is a phenomenon of aging of the resistor. The outer string gap arrester can solve this problem well. However, the gaps used in the external series gap surge arresters in the market are different, and the electrode shapes are also different.

Publication number CN201518386 discloses a ring-shaped series gap arrester for 10kV system transmission lines, which is mainly used for 10kV distribution network transmission lines to protect insulated overhead lines, bare aluminum stranded wires, and steel-cored aluminum stranded wires from disconnection caused by lightning strikes, and to protect various Porcelain pin insulators, composite post insulators, guy wire insulators, ceramic cross-arms, etc. are protected from flashover or breakdown caused by atmospheric overvoltage. However, the ring electrode is easy to attract birds to build nests, which brings hidden dangers to the safe operation of the line. Once the arrester body is damaged, after the series gap is broken down under the action of lightning overvoltage, the power frequency freewheeling arc will burn stably, and the arc root is protected by the insulating layer. The anticoagulation is fixed on a point on the wire, and the wire still has the possibility of disconnection.

Publication No. CN2847475 discloses a metal oxide lightning arrester with external series gaps for protecting insulated wires, which can effectively prevent lightning breakage of overhead insulated wires. Guide the power-frequency freewheeling arc to burn on itself, and guide the arc to drift away from the wire. However, the arc guide foot is a symmetrical structure, and one side is close to the insulator. When the power frequency freewheeling arc drifts towards the insulator, it is easy to damage the insulator.

For 10kV insulated wires, the piercing electrode needs to penetrate the insulation layer of the wire and be firmly in contact with the wire core for a long time; the form of the arc-leading foot of the piercing electrode must meet the requirements of the above-mentioned different situations; due to the installation of a high-voltage piercing electrode, the potential of the wire is drawn out, and there is insulation The problem of partially exposed wires.

In addition, most of the patents on string gap arresters use symmetrical electrodes, and have not yet mentioned asymmetrical electrodes and their advantages.

Invention content

The purpose of the utility model is to solve the problems existing in the puncture electrodes of the existing 10kV insulated wires and overcome the shortcomings of the electrodes used in the outer series gap metal oxide arrester. The utility model discloses a new type of asymmetric puncture electrode suitable for the puncture arrester.

The technical scheme of the utility model is that an asymmetric piercing electrode suitable for a piercing arrester is composed of a piercing clip, an arc guiding foot and an insulating cover. The puncture clamp is installed on the 10kV insulated wire, and the arc guide foot is installed under the 10kV insulated wire. After the arc guide foot is assembled, it is set outside it, which can withstand a certain arc, and solves the problem that the high-voltage puncture electrode makes the insulated wire partially exposed and there is an insulation defect.

The puncture wire clip is composed of an upper pressure plate, a middle pressure plate, a lower pressure plate, nuts, lock nuts and bolts; two bolts are vertically installed on both sides of the lower pressure plate, and the middle pressure plate and the upper pressure plate are installed on the lower pressure plate through the bolts. The pressing plate is at the bottom, and the upper pressing plate is at the top; the upper side of the middle pressing plate and the lower side of the upper pressing plate can be relatively closed, and the upper side of the middle pressing plate and the lower side of the upper pressing plate respectively have a semicircular half-circle with triangular sharp teeth; the upper two ends of the upper pressing plate pass through The bolts come with nuts and locknuts.

The utility model can ensure long-term reliable contact between the puncture electrode and the wire core. A certain number of sharp teeth protrude from the inner surface of the piercing wire clamp, squeeze and penetrate the insulation layer of the wire to contact the core wire, and lead the potential of the wire out.

The technical principle of the utility model: the asymmetric puncture electrode of the utility model can form an air gap with the arrester body when the arrester body is in good condition, so as to ensure that the arrester body does not bear the power frequency voltage during normal operation, and the air gap strikes first when lightning strikes and flashovers Through the lightning arrester body, the lightning current is released and the power frequency continuous current arc is cut off; when the arrester body is damaged and the gap breaks down again, the power frequency continuous current arc can be guided to burn on itself through the asymmetrical arc guide foot. And direct the arc to drift outwards away from the wires and insulators.

The purpose of designing this new type of asymmetric piercing electrode is to further protect the insulator and prevent lightning strikes from disconnecting. Compared with the existing technology, in the event of damage to the arrester body and breakdown of the gap, the asymmetrical arc guide can guide the power frequency freewheeling arc to burn on itself, and guide the arc not only away from the wire, but also away from the insulator drift outward.

The utility model is suitable for lightning protection of 10kV overhead insulated wires.

Description of drawings

Figure 1 is the front view of the asymmetric puncture electrode;

Figure 2 is a top view of the asymmetric puncture electrode;

Figure 3 is a schematic diagram of the structure of the puncture wire clamp;

In the figure, 1 is the puncture wire clamp; 2 is the arc guide foot; 3 is the insulating cover; 4 is the upper pressure plate; 5 is the middle pressure plate; 6 is the lower pressure plate; 7 is the backup nut; 8 is the lock nut; 9 is the screw .

Detailed ways

The specific embodiment of the utility model is shown in the figure.

In this embodiment, an asymmetric piercing electrode suitable for a piercing arrester is composed of a piercing clamp 1 , an arc guide foot 2 and an insulating cover 3 . The puncture clamp 1 is installed on the 10kV insulated wire, and the arc guide foot is installed under the 10kV insulated wire. After the wire clip 1 and the arc guide foot 2 are assembled, they are covered outside, which can withstand a certain arc, and solve the problem of insulation defects caused by the high-voltage puncture electrode partially exposing the insulated wire.

In this embodiment, the puncture wire clip is composed of an upper pressure plate 4, a middle pressure plate 5, a lower pressure plate 6, a nut 7, a lock nut 8 and a bolt 9; two bolts are installed vertically on both sides of the lower pressure plate 6, and the middle pressure plate 5 and The upper platen 4 is installed on the lower platen 6 through bolts 9, the middle platen 5 is at the bottom, and the upper platen 4 is at the top; There are semicircular Huffs with triangular tines respectively; nuts 7 and lock nuts 8 are provided on the bolts 9 passing through the upper two ends of the upper pressing plate 4 .

In this embodiment, an asymmetric puncture electrode suitable for a puncture arrester, the specific operation steps are as follows:

(1) Take off the insulating cover 3, unscrew the lock nut 8 and the backup nut 7 successively from the bolt 9, and divide the semicircular halves of the upper pressure plate 4 and the middle pressure plate 5 of the puncture wire clamp 1 into two parts according to the original The corresponding position is hugged on the insulated wire sheath, screw on the backup nut 7 but do not tighten it for the time being.

(2) Adjust the position of the puncture electrode, align the puncture wire clip 1, and make the arc guide foot 2 below the wire, and the lower ends of the puncture wire clip 1 and the arc guide foot 2 are in a horizontal position.

(3) Continue to tighten the backup nut 7 with a wrench until the inner tines of the half-circle Haff of the puncture wire clamp touch the wire core, and then tighten the lock nut 8.

(4) Put the insulating cover on the outside of piercing wire clamp 1 and arc guide foot 2.

Claims (4)

1., for an asymmetric penetrating electrodes for Penetrative lightning arrester, it is characterized in that, described electrode by penetrating cable clamp, lead arc pin and insulating cover forms; Described penetrating cable clamp is arranged on 10kV insulated conductor, leads arc pin and is arranged on below 10kV insulated conductor; Insulating cover is enclosed within its outside at penetrating cable clamp with leading after arc pin has been assembled.

2. a kind of asymmetric penetrating electrodes for Penetrative lightning arrester according to claim 1, is characterized in that, described penetrating cable clamp is combined by top board, center platen, lower platen, standby jack panel and pressure nut; Two bolts are vertically mounted on lower platen both sides, and center platen and top board are arranged on lower platen through bolt, center platen under, top board is upper; Can relatively closing up with below top board above of center platen, the bolt that two ends pass above of top board is furnished with nut and locking nut.

3. a kind of asymmetric penetrating electrodes for Penetrative lightning arrester according to claim 1, it is characterized in that, described arc pin of leading adopts left-right asymmetry structure, adopts split design with penetrating cable clamp, and is that certain radian extends along the direction of departing from wire and insulator.

4. a kind of asymmetric penetrating electrodes for Penetrative lightning arrester according to claim 2, is characterized in that, has the semicircle Hough of triangle pointed tooth respectively, for clamping insulated conductor above described center platen and below described top board.