CN201402694Y - Pillar Type Composite Jacket Gapless Metal Oxide Surge Arrester - Google Patents

Abstract

The utility model relates to a metal oxide surge arrester with a pillar type composite jacket without gaps. It consists of a reinforced insulating tube covered with a silicone rubber shed to form a jacket. Its upper end has an upper end cover, a terminal block, and its lower end has a base and fasteners. The inner cavity is stacked with aluminum electrode blocks from top to bottom. , resistance sheet group, and lower aluminum electrode block; the resistance sheet group is a metal oxide sheet group; it can be used not only as a lightning arrester, but also as a post insulator during use, so that the arrester and post insulator are combined into one.

Description

Pillar Type Composite Jacket Gapless Metal Oxide Surge Arrester

Technical field:

The utility model relates to a pillar type non-gap oxide lightning arrester used for medium-voltage power distribution lines in electric power systems. It can limit the overvoltage when the line is struck by lightning or operate overvoltage, and can also be used as a post insulator to support the wire.

Background technique:

Generally, post insulators for supporting wires and lightning arresters for limiting overvoltages should be installed at the cable terminals of medium-voltage distribution lines. Since there are cross-arm wire connections at the connection between overhead lines and cable terminals, a large part of the space is occupied. Therefore, Adding lightning arresters near the supporting post insulators will bring some difficulties to the construction.

Utility model content:

The purpose of this utility model is to aim at the defects existing in the prior art, to provide a metal oxide surge arrester with a pillar type composite jacket without gaps, which can be used not only as a surge arrester but also as a pillar insulator during use, so that the lightning arrester and the pillar insulator All in one.

In order to achieve the above object, the utility model adopts the following technical solutions:

A pillar-type composite jacket gapless metal oxide surge arrester, including a jacket, a resistance sheet group, and upper and lower aluminum electrode blocks, is characterized in that:

i. The jacket consists of a reinforced insulating tube covered with a silicone rubber shed;

ii. The upper and lower ends of the jacket are fixed and sealed respectively to the upper and lower electrode blocks;

iii. Between the upper and lower aluminum electrode blocks in the inner cavity of the outer casing, the resistance sheet group is stacked without gaps; the resistance sheet group is a metal oxide sheet group;

iv. There is an upper end cover covering the upper end of the jacket and the upper aluminum electrode block, and 1 to 2 screw holes on the top of the upper aluminum electrode block are aligned with the perforations on the upper end cover;

v. There is a base covering the lower end of the jacket and the lower aluminum electrode block, and a fastener passes through the base and is screwed to the lower aluminum electrode block.

In the above lightning arrester, a high-voltage terminal is fixed on the upper end cover through screw connection with the screw hole at the top of the upper aluminum electrode block.

The above-mentioned high-voltage terminals are puncture-type, connecting-plate-type, trunking-tying-type or trunking-pressing-plate-type.

Compared with the prior art, the utility model has the following obvious outstanding substantive features and notable points:

1. Combining the functions of the post insulator and the power distribution arrester into one product greatly simplifies the installation cost and occupied space of the user.

2. The bending failure load is relatively high, which can reach the 4kN requirement stipulated in GB8287.1-1998 Technical Conditions for High Voltage Post Porcelain Insulators.

3. All parts in the inner cavity are not connected by conductive glue, so that the arithmetic sum of the overall nominal current residual voltage of the entire arrester and the value measured by a single component is consistent, ensuring the overall residual voltage value of the product.

4. According to the different needs of users, the high-voltage terminal connected to the arrester can be selected in different types and structures: puncture type, connecting plate type, wire slot binding type or wire slot pressing plate type terminal block.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Figure 2 is an outline drawing of the example of Figure 1 with piercing terminals.

FIG. 3 is a top view of FIG. 2 .

Figure 4 is an outline drawing of the example of Figure 1 with a connection plate terminal block.

FIG. 5 is a top view of FIG. 4 .

Fig. 6 is an outline view of the example in Fig. 1 of the tie-type terminal with wire groove.

FIG. 7 is a top view of FIG. 6 .

Fig. 8 is an outline view of the example in Fig. 1 of the clamping plate type terminal with wire slot.

FIG. 9 is a top view of FIG. 8 .

Detailed ways

A preferred embodiment of the present utility model is described as follows in conjunction with the accompanying drawings: Referring to Fig. 1, the metal oxide surge arrester with no gaps in the pillar-type composite jacket includes a jacket, resistance sheet group 5 and upper and lower aluminum electrode blocks 2, 6, and the jacket is composed of A reinforced insulating tube 4 is covered with a silicone rubber shed 3; the upper and lower ends of the jacket are respectively fixed and sealed with the upper and lower electrode blocks 2 and 6; between the upper and lower aluminum electrode blocks 2 and 6 in the inner cavity of the jacket, The resistance sheet group 5 is stacked without gaps; the resistance sheet group 5 is a metal oxide sheet group; the upper end cover 1 covers the upper end of the jacket and the upper aluminum electrode block 2, and there are 1 to 2 screw holes on the top of the upper aluminum electrode block 2 9 is aligned with the perforation on the upper end cover 1; a base 7 covers the lower end of the casing and the lower aluminum electrode block 6, and a fastener 8 is screwed through the base 7 and the lower aluminum electrode block 6.

Referring to Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, a high-voltage terminal 10 is fixed on the upper end cover through screw 11 and screw hole 9 on the top of the upper aluminum electrode block 6 1 on. The high-voltage terminal 10 is a piercing type, connecting plate type, wire slot binding type or wire slot pressing plate type terminal for connecting high voltage wires. The usefulness and functions of high-voltage terminal blocks 10 of various types and structures are introduced as follows:

1. Puncture type terminal: used at the lead wire of 10kV transformer, not only as the supporting insulator of the transformer equipment, but also as the overvoltage protection of its equipment. It is mainly used to pierce the insulation layer of the wire with a spiked terminal when the insulated lead wire on the high voltage side of the transformer passes through the arrester, so that the core of the insulated lead wire is in close contact with the upper terminal of the arrester, which has the effect of overvoltage protection. Then cover the exposed metal part with an insulating cover, and make the other end of the arrester in close contact with the grounding electrode. In this move, the two sets of supporting insulators and lightning arresters were originally integrated into one set.

2. Connecting plate type terminal block: used at the climbing pole device of the outgoing cable of 10kV distribution line, not only as a support insulator for the excessive connection device between the outgoing cable and the overhead conductor, but also as an overvoltage protection at the junction of different wave impedances. Since there must be a clear demarcation point between the outgoing cable and the overhead line, and it is convenient to untie the terminal for shaking measurement after the cable fault; therefore, it is necessary to have an over-connection device and use insulators to support and fix it, and because it is a "junction of different wave impedances" , so a set of lightning arresters should also be set up. Now we have developed a set of over-connection devices, rich in bending resistance and other functions called connected plate arresters to replace the traditional practice. In this move, the two sets of supporting insulators and lightning arresters were originally integrated into one set.

3. Wire trough tie type terminal: used for the exposed wires of 10kV distribution lines, mainly when the exposed wires are in the wilderness, high places, areas prone to lightning strikes, or need to be protected by lightning arresters, the traditional method is to use this wire A set of lightning arresters are installed on the pole, and a set of wire groove arresters with wire slots at the end and full of bending resistance functions have been developed to replace the traditional method. The construction process is exactly the same as the previous method, that is, put the bare wires into the wire slots, and use metal binding wires to tightly bind the exposed wires and the metal wire slots at the end; so that it can play the original function of supporting insulators and lightning arresters. In this move, the two sets of supporting insulators and lightning arresters were originally integrated into one set.

4. Trough plate type terminal: used for insulated wires of 10kV distribution lines, mainly installed on corner poles, tension poles and some special pole types; the traditional method is to install a group of arresters on this pole, Now we have developed a set of clamp arresters with clamps at the end, which is full of functions such as bending resistance, which is called clamp arrester to replace the traditional method. That is, by peeling off the insulation layer of the insulated wire, the wire core of the wire is closely connected with the upper clamping part of the arrester, and the lower part of the arrester is connected with the grounding part, so that when the lightning passes through the clamping part, the overvoltage can be quickly passed through The arrester releases into the earth. In this move, the two sets of supporting insulators and lightning arresters were originally integrated into one set.

working principle:

When the system is in normal operation, the post arrester is basically in an insulating state, and it only plays the role of a post insulator in the power system, supporting and fixing the medium voltage cable terminal. When the distribution line is struck by lightning, the higher impulse voltage is immediately transmitted to the nonlinear element (resistor) through the terminal and the upper aluminum electrode. Because the metal oxide resistor has very good volt-ampere characteristics, the higher impact The voltage makes the resistance value of the resistor sheet decrease rapidly instantly, and the lightning current flows into the earth through the resistor sheet, and prevents the generation of power frequency freewheeling in the power grid. After the lightning strike, the arrester returns to its original basic insulation state.

Claims (3)

1. a column support type composite sheath gapless metal-oxide lighting arrester comprises overcoat, resistor disc group (5) and upper and lower aluminium electrode block (2,6), it is characterized in that:

A. described overcoat a silicon rubber full skirt (3) by a reinforced insulation pipe (4) overcoat and is constituted;

B. the upper and lower end of described overcoat is distinguished the described upper and lower electrode block of fixed seal connection (2,6);

C. between the described upper and lower aluminium electrode block (2,6) of described overcoat inner chamber, the stacked described resistor disc group in no gap (5); Described resistor disc group (5) is a metal oxide sheet group;

D. have a upper end cover (1) to cover described overcoat upper end and last aluminium electrode block (2), there is the perforation on 1～2 screw (9) aligning upper end cover (1) on last aluminium electrode block (2) top;

E. there is a base (7) to cover described overcoat bottom and following aluminium electrode block (6), has a securing member (8) to pass described base (7) and spin with described aluminium electrode block (6) down.

2. column support type composite sheath gapless metal-oxide lighting arrester according to claim 1 is characterized in that having a high-voltage connection terminal (10) to spin and two be fixed on the upper end cover (1) by screw (11) and described aluminium electrode block (6) the top screw (9) of going up.

3. column support type composite sheath gapless metal-oxide lighting arrester according to claim 1, it is characterized in that described high-voltage connection terminal (10) for piercing, connect board-like, wire casing binding formula or wire casing presser type binding post.

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