CN203800224U - Shunt line 90 degree spiral clamping head - Google Patents

Abstract

Disclosed is a 90° spiral chuck for a diversion line. It includes a fastening hook, a fastening lead screw, a fastening block, a fixed seat, a first bevel gear, a second bevel gear and a connecting plug. The 90° spiral chuck of the shunt line provided by the utility model is suitable for installing the shunt line on the vertically arranged wires. Through actual operation and comparison test, the shunt line connected by the 90° spiral chuck is used for grounding. The work of the potential live short circuit isolating switch has the characteristics of short time, low labor intensity, convenience and quickness. It can effectively share part of the current, increase the flow capacity of the short circuit, meet the actual production requirements, and reduce emergency repairs. The number of times and the number of unplanned power outages have improved the reliability of power supply and increased electricity sales.

Description

A kind of 90° spiral chuck for diversion line

technical field

The utility model belongs to the technical field of electric power overhaul and maintenance devices, in particular to a 90° spiral chuck for a shunt line.

Background technique

In the power system, since most electrical equipment is exposed to the harsh outdoor environment for a long time, after long-term exposure to the sun and rain, the galvanic corrosion phenomenon at the equipment joints will be very serious, which often leads to corrosion and heat generation at the equipment joints. As a result, it brings great hidden dangers to the safe and stable operation of the equipment, and even causes unplanned power outages in severe cases, thereby seriously reducing the reliability index of power supply.

Taking the equipment under the jurisdiction of the First Substation Management Institute of its power supply company as an example, there were 59 cases of thermal defects between 2009 and 2011, including 29 cases of GW5 type isolation switch heating, resulting in 18 unplanned power outages. Among them, the heating defects of the isolating switch are mostly current-induced heating defects, mainly concentrated in current-carrying parts such as contacts, contact fingers, conductive rod connections, and equipment joints.

According to DL/T664-2008 "Application Specifications for Infrared Diagnosis of Live Equipment", heating defects can be divided into three types: general, serious, and critical. If any heating part is judged as a serious or critical defect, it must be shut down for maintenance as soon as possible or immediately, or measures to temporarily reduce the load current must be taken. Therefore, if it is possible to short-circuit the shunt line at both ends of the heat-generating part when it is hot, use the shunt line to temporarily share part of the current, thereby reducing the temperature of the hot spot and ensuring reliable power supply of the equipment. It can greatly improve the power supply reliability of the equipment and reduce unplanned power outages. In order to ensure the reliable connection between the shunt line and the two ends of the heating part and reduce the contact resistance, a corresponding shunt line clamp is required. But still lack such device at present.

Contents of the invention

In order to solve the above problems, the purpose of this utility model is to provide a 90° spiral chuck with a reasonable design, simple structure and convenient operation.

In order to achieve the above-mentioned purpose, the 90° spiral clamp of the shunt line provided by the utility model includes a fastening hook, a fastening screw, a fastening block, a fixed seat, a first bevel gear, a second bevel gear and a connecting plug; The side of the fastening hook is formed with terminal posts; the fixing seat is an L-shaped plate composed of a horizontal plate and a vertical plate, wherein one side of the horizontal plate is connected to the lower end of the fastening hook, and a through hole is formed in the middle of the horizontal plate ; The first bevel gear is installed on the bottom surface of the horizontal plate in a rotating manner; the middle part of the fastening screw is threaded in the center hole of the first bevel gear above, and runs through the through hole on the horizontal plate; the second bevel gear is It is installed on the front face of the vertical plate in a rotating manner, and meshes with the first bevel gear, and is connected to the connecting plug on the rear side of the vertical plate through a connecting rod passing through the vertical plate; the fastening block is installed on the fastening screw and located in the space enclosed by the hook body.

The connecting plug is a cylindrical structure made of iron material, and two positioning columns are formed on its outer peripheral surface.

An arc-shaped groove is formed in the middle part of the front end surface of the fastening block.

The 90° spiral chuck of the shunt line provided by the utility model is suitable for installing the shunt line on the vertically arranged wires. Through actual operation and comparison test, the shunt line connected by the 90° spiral chuck is used for grounding. The work of the potential live short circuit isolating switch has the characteristics of short time, low labor intensity, convenience and quickness, can effectively share part of the current, increase the flow capacity of the short circuit part, meet the actual production requirements, and reduce emergency repairs and power outages The number of times and the number of unplanned power outages have improved the reliability of power supply and increased electricity sales.

Description of drawings

Fig. 1 is the front view of the 90° spiral chuck structure of the shunt line provided by the utility model.

Fig. 2 is a bottom view of the 90° spiral chuck structure of the shunt line provided by the utility model.

Detailed ways

The 90° spiral chuck of the shunt line provided by the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Fig. 1 and Fig. 2, the 90° spiral chuck provided by the utility model includes a fastening hook 1, a fastening screw 2, a fastening block 3, a fixed seat 4, a first bevel gear 5, The second bevel gear 6 and the connection plug 10; wherein the side of the fastening hook 1 is formed with a terminal post 7; the fixed seat 4 is an L-shaped plate made of a horizontal plate 8 and a vertical plate 9, wherein one side of the horizontal plate 8 is connected to the fastening The lower ends of the fixed hooks 1 are connected, and a through hole is formed in the middle of the horizontal plate 8; the first bevel gear 5 is installed on the bottom surface of the horizontal plate 8 in a rotating manner; The central hole of a bevel gear 5 runs through the through hole on the horizontal plate 8 at the same time; the second bevel gear 6 is installed on the front end surface of the vertical plate 9 in a rotating manner, and meshes with the first bevel gear 5, and passes through at the same time A connecting rod that runs through the vertical plate 9 links to each other with the connecting plug 10 positioned at the rear side of the vertical plate 9; the fastening block 3 is installed on the upper end of the fastening screw 2 and is located in the space surrounded by the hook body.

The connecting plug 10 is a cylindrical structure made of iron material, and two positioning posts 11 are formed on its outer peripheral surface.

An arc-shaped groove 12 is formed in the middle of the front end of the fastening block 3 to facilitate close contact with the outer surface of the wire.

Now the method of using the 90° spiral chuck of the shunt line provided by the utility model is described as follows:

①When an isolating switch generates heat and needs to short-circuit the shunt line at both ends, since this work is live work at ground potential, it needs to be operated in accordance with the "Safety Regulations for Live Work" and can only be carried out after approval by the supervisor.

② Check the phase of the isolating switch before short-circuiting.

③ The staff removes the oxide layer on the wires on both sides of the isolating switch and the part of the shunt line to be assembled on the chuck. It can be done with an insulating operating rod with a wire brush fixed on the front end to make it in good contact.

④ Make sure that the circuit breaker is in the closed position, remove the trip circuit fuse, and lock the trip mechanism before shorting.

⑤ Connect the two ends of the short wire to the terminal posts 7 of the two 90° screw-type chucks respectively by two workers, and then insert the front slot of the insulating operating rod with a powerful magnet inside to the outside of the connecting plug 10, And rotate to use the positioning column 11 to lock the connecting plug 10 in the slot at the front end of the insulating rod. At this time, the fastening hook 1 is in a horizontal state. streamline until the wire at the shunt line to be assembled is inserted into the space between the fastening hook 1 and the fastening block 3, and then turn the insulating operating lever to drive the second bevel gear 6 through the connecting plug 10 and the connecting rod Rotate, and the first bevel gear 5 that meshes with the second bevel gear 6 will also rotate together, and then drive the fastening screw 2 to rotate, thereby making the fastening block 3 move to the inner surface of the front end of the fastening hook 1 until Utilize the fastening block 3 and the inner surface of the front end of the fastening hook 1 to clamp the wire tightly. Remove the insulating operating rod.

⑥ Finally, support the shunt line well to prevent grounding or short circuit caused by swinging.

During the maintenance period of a certain isolating switch (GW5 type), the inventor repeatedly checked and tested the shunt line used. Use the 5501 loop resistance tester (produced by Baoding Jinda Electric Co., Ltd.) to conduct a comparative test on site. Before the shunt line was shorted, the contact resistance in the measurement range was 1.2 milliohms, and after the short circuit, the contact resistance in the measurement range was reduced to 300 microohms. It can be seen that the shunt line played a shunt role and achieved the expected effect.

Claims (3)

1. A 90° spiral chuck for a shunt line, characterized in that it includes a fastening hook (1), a fastening screw (2), a fastening block (3), a fixing seat (4), a first The bevel gear (5), the second bevel gear (6) and the connecting plug (10); the side of the fastening hook (1) is formed with a terminal post (7); the fixing seat (4) is composed of a horizontal plate (8) and An L-shaped plate composed of vertical plates (9), in which one side of the horizontal plate (8) is connected to the lower end of the fastening hook (1), and a through hole is formed in the middle of the horizontal plate (8); the first bevel gear (5) Installed on the bottom surface of the horizontal plate (8) in a rotating manner; the middle part of the fastening screw (2) is threaded in the center hole of the first bevel gear (5) above, and runs through the horizontal plate (8) at the same time The through hole on the top; the second bevel gear (6) is installed on the front end face of the vertical plate (9) in a rotating manner, and meshes with the first bevel gear (5), and at the same time passes through a vertical plate (9) The connecting rod is connected with the connecting plug (10) on the rear side of the vertical plate (9); the fastening block (3) is installed on the upper end of the fastening screw (2) and is located in the space surrounded by the hook body. 2. The 90° spiral chuck for the shunt line according to claim 1, characterized in that: the connecting plug (10) is a cylindrical structure made of iron material, and two holes are formed on its outer peripheral surface. positioning posts (11). 3. The 90° spiral clamp for diversion line according to claim 1, characterized in that: an arc-shaped groove (12) is formed in the middle of the front end surface of the fastening block (3).