CN102403674B - A kind of live-wire work insulating cross arm - Google Patents

Abstract

The invention provides an insulating cross arm for live work. A hoop is installed on the pole through the top wire clip, and a bracket is installed on the hoop at an interval of 120° through the bracket and the hoop connecting frame to tilt outwards. A bracket tether head is provided on the upper end of the bracket, and a diameter is connected to the upper part of the hoop. Adjusting hoop, the upper part of the diameter adjusting hoop is connected with a center rod, the upper end of the center rod is provided with a bracket center head, a pull rope is connected between the bracket center head and the bracket tethering head, and a hanging rope is connected to each bracket tethering head through a rope. The hook pulley is bolted with a hook at the bottom of the hook pulley. The invention can replace the wires with electricity, can effectively control the air gap and safety distance between the wires and the cross arm and other lines on the same pole, and has the characteristics of convenient installation, simple operation, and multi-layer wires can be used universally. It is suitable for use in live installation wires on power transmission devices.

Description

An insulating crossarm for live work

technical field

The invention provides a power transmission line installation tool in the electrical field, in particular an insulating cross arm for live work.

Background technique

At present, the existing domestic 10kV live working insulating cross arm cannot be used effectively, and there are disadvantages of unsafety, which not only increases the risk factors of operators, but also fails to meet the requirements of improving the reliability of power supply. And it is necessary to cut off the power to replace the insulating cross arm, which reduces the work efficiency.

Contents of the invention

In order to overcome the shortcomings of the existing insulating cross-arm, the invention provides an insulating cross-arm for live work. The cross arm solves the technical problem of live wire installation by installing triangular brackets on the pole, and installing rope pulleys and hooks on each bracket to hoist the wires.

The scheme that the present invention solves technical problem adopts is:

A hoop is installed on the pole through the top wire clip, and a bracket is installed on the hoop at an interval of 120° through the bracket and the hoop connecting frame to tilt outwards. A bracket tether head is provided on the upper end of the bracket, and a diameter is connected to the upper part of the hoop. Adjusting hoop, the upper part of the diameter adjusting hoop is connected with a center rod, the upper end of the center rod is provided with a bracket center head, a pull rope is connected between the bracket center head and the bracket tethering head, and a hanging rope is connected to each bracket tethering head through a rope. The hook pulley is bolted with a hook at the bottom of the hook pulley. The bracket is a square tube made of epoxy resin composite material.

The positive effect is that the present invention transfers the vertical load of the original cross-arm carrying the wire to the insulating cross-arm when the wire is replaced with electricity, ensuring that the wire is stable and reliable. And the height of the three-phase wires can be raised or lowered to varying degrees by using the lifting on the insulating cross-arm device. It can effectively control the air gap and safety distance between the conductor and the cross-arm and other lines paralleled on the same pole. It has the characteristics of convenient installation, simple operation, and universal multi-layer conductors. It is suitable for use in live installation wires on power transmission devices.

Description of drawings

Fig. 1 is the state diagram of the insulating cross-arm structure of the present invention

In the figure, 0. Pole, 1. Hoop, 2. Bracket, 2.1. Bracket and hoop connecting frame, 2.2. Bracket tie rope head, 3. Diameter adjustment hoop, 4. Bracket center head, 5. Pull rope, 6. Suspension pulley, 6.1. Hook, 7. Center rod.

Detailed ways

A hoop 1 is installed on the pole through a top wire clip, and a bracket 2 is installed on the hoop at a distance of 120° through the bracket and the hoop connecting frame 2.1. The upper part is connected with a diameter adjustment hoop 3, and the upper part of the diameter adjustment hoop is connected with a center rod 7, and the upper end of the center rod is provided with a bracket center head 4, and a stay rope 5 is connected between the bracket center head and the bracket tie rope head. Be connected with suspension hook pulley 6 by rope on the rope end, be bolted with suspension hook 6.1 at the bottom of suspension hook pulley.

The bracket adopts a square tube made of epoxy resin composite material to ensure insulation performance.

The use process of the present invention:

Tie the pre-installed wires to the hook, pull the rope to lift the hook to the set height, and install the wires live. According to the length of the cross arm, the angle between the bracket and the pole is increased or decreased by pulling up and down the center pole, thereby changing the distance between the two supports to meet the requirements of the length of the cross arm.

The cross arm is used to pull up the wire. By the length of the elastic stay rope and the length of the rope on the upper part of the hook pulley, the suspended conductor can reach the set height.

Use the existing insulating cross-arms to combine them into triangles to lift the wires, decompose the vertical load of the wires through the mechanical characteristics, and then make the wires scale up and down by tightening the wires. It can make the vertical distance of the wire reach the proper working height.

Fix the bottom end of the fulcrum of the middle conductor on the hoop that holds the pole tightly, and lock the hoop with the top wire to prevent the insulating cross arm from swinging.

Features of the present invention:

1. The power frequency withstand voltage is 45KV, and there is no breakdown within 1 minute.

2. The mechanical strength and tensile strength meet the standard technical indicators.

3. The insulation performance reaches the standard technical index.

4. The wire can be replaced under the charged state.

The invention can transfer the vertical load of the original cross arm carrying the wire to the insulating cross arm when the wire is replaced with electricity, so as to ensure the stability and reliability of the wire. And the height of the three-phase wires can be raised or lowered to varying degrees by using the lifting on the insulating cross-arm device. It can effectively control the air gap and safety distance between the conductor and the cross-arm and other lines paralleled on the same pole. It has the characteristics of convenient installation, simple operation, and universal multi-layer conductors. It overcomes the difficulty of replacing the cross arm with all straight rods.

Claims (2)

1. An insulated crossarm for live work, characterized in that: a hoop (1) is installed on the pole (0) through a top wire clip, and the hoop is separated by 120° through the bracket and the hoop connecting frame (2.1). A bracket (2) is installed obliquely on the outside, a bracket tether head (2.2) is arranged on the upper end of the bracket, a diameter adjustment hoop (3) is connected to the upper part of the hoop, and a center rod (7) is connected to the upper part of the diameter adjustment hoop. The upper end is provided with a bracket center head (4), and a stay rope (5) is connected between the bracket center head and the bracket tethered rope head, and a hook pulley (6) is connected to each bracket tether rope head through a rope. The bottom of the pulley is bolted with a suspension hook (6.1). 2. A live working cross arm according to claim 1, characterized in that: the bracket is made of a square tube made of epoxy resin composite material.