CN203839878U - Separable full-insulation lightning arrester for cable protection - Google Patents

Abstract

The utility model discloses a detachable fully insulated lightning arrester for protecting cables, which comprises a bottom frame, a switch knife, a post insulator, an upper contact, a lower contact, a locking device and a lightning arrester arranged between the post insulators, and the post insulator Symmetrically arranged on both sides of the chassis, one end of the switch knife is hinged with the lower contact, the other end is a free end and contacts the upper contact, the locking device is installed on the free end of the switch knife and the post insulator, the lower end of the arrester It is fixed on the bottom frame, and the upper end is provided with contact fingers, and the switch knife is arranged on the contact sheet matched with the contact fingers. The upper contact is connected with the overhead cable, and the lower contact is connected with the ground cable. The utility model combines the multiple functions of the isolating switch/drop-out fuse and the arrester, which can reduce the cost, reduce the construction intensity, facilitate maintenance and inspection, and quickly find the fault point of the underground cable, reduce the power outage area and shorten the power outage time for the construction of the power grid. Provide many economic and social benefits such as system safety and reliability.

Description

Separable fully insulated lightning arrester for protecting cables

technical field

The utility model relates to a lightning arrester, in particular to a detachable fully insulated lightning arrester for protecting cables.

Background technique

According to the State Grid 10kV overhead line standard design specification, currently in the process of overhead line into the ground, the main configuration and installation is that the overhead line leads the connection line through the clamp, and the GW9 series isolating switch or drop-out fuse is installed under the connection line. , through the lightning arrester and then to the connection end of the underground cable. Among them, as many as three beam brackets, hoops, and multiple terminal blocks are installed correspondingly, which makes the distribution of power devices on the tower messy, increases the construction cost and strength, and is not convenient for maintenance and inspection. When a fault occurs, the power consumption is greatly reduced Efficiency in finding the point of failure.

Contents of the invention

The purpose of this utility model is to provide a detachable fully insulated lightning arrester for cable protection in order to solve the above problems, which combines the main functions of the disconnector/drop-out fuse and the lightning arrester into one, and further optimizes the messy situation of the tower , reduce cost, reduce construction intensity, facilitate maintenance and inspection, especially have unique advantages in quickly finding the fault point of underground cables.

The purpose of this utility model is achieved in that:

A detachable fully insulated lightning arrester for protecting cables of the utility model is installed on a pole tower. The top of the pole tower is provided with an insulator and the bottom is provided with an earth cable. The overhead line is erected on the top of the insulator. The fully insulated The arrester includes a base frame, a switch knife, a post insulator, an upper contact, a lower contact, and a locking device. The post insulators are symmetrically arranged on both sides of the base frame, and one end of the switch knife is hinged to the lower contact. , the other end is a free end and is in contact with the upper contact, the locking device is installed on the free end of the switch knife and the post insulator, and the fully insulated arrester also includes a set between the post insulators The lightning arrester, the lower end of the lightning arrester is fixed on the base frame, and the upper end is provided with contact fingers, and the switch knife is provided on the contact pieces that cooperate with the contact fingers;

The upper contact is connected to the overhead cable through a cable with an Amp connector;

The lower contact is connected with the grounding cable.

The above-mentioned detachable fully insulated lightning arrester for protecting cables, wherein the lock device includes a bracket, a pull buckle, a lock buckle, a return spring and a limit pin, and the bracket includes a The horizontal section and the upward extending section at the top of the post insulator, the upward extending section is provided with an opening for accommodating the lock and a lock hole, and the pull is pivotally connected to the switch blade through a first rotating shaft, And the first rotating shaft is covered with a bushing, the pull buckle includes a pull ring on its upper part, a lower hole on its lower part and a pick finger on the left side of the lower hole, and the lock buckle is pivoted through the second rotating shaft. Connected to the free end of the switch knife, the lock includes a stopper located on the right side of the lock against the pick finger of the pull buckle, and a lock hole located at the lower part of the lock and connected to the bracket The matching lock hook, one end of the return spring is set on the sleeve of the first rotating shaft, the other end is pressed on the stopper of the lock, and the limit pin is set on the knife. And pass through the lower hole, the middle part of the return spring abuts against the lower part of the limiting pin.

At present, the products configured on 10kV overhead lines and towers are mainly G(H)W9-12/630 isolating switches, PR(H)W10 series drop-out fuses and YH5WS2-17/50 metal oxide arresters. Their technologies Please see the table below for the comparison of parameters and the utility model:

From the above comparison table of technical parameters of various products, it can be seen that the utility model has excellent technical performance and multiple functions combined with isolating switch/drop-out fuse and lightning arrester. It lays a favorable foundation for further optimization and improvement of the 10kV overhead line tower.

The utility model can bring many economic and social benefits such as cost reduction, reduced construction intensity, convenient maintenance and inspection, quick search for underground cable fault points, reduced power outage area, shortened power outage time, and system safety and reliability for power grid construction.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of the utility model installed on a tower.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Please refer to Fig. 1, which shows a detachable fully insulated lightning arrester 1 for protecting cables of the present invention, including a chassis 14, a switch knife 11, a post insulator 15, an upper contact 12, a lower contact 13, and a locking device , the post insulators 15 are symmetrically arranged on both sides of the chassis 14, one end of the switch blade 11 is hinged with the lower contact 13, and the other end is a free end and contacts with the upper contact 12, the utility model full insulation arrester 1 also includes a The lightning arrester 16 arranged between the post insulators 15, the lower end of the lightning arrester 16 is fixed on the chassis 14, and the upper end is provided with a contact finger 161, and the switch blade 11 is provided on the contact piece 162 matched with the contact finger 161;

The locking device comprises a bracket 17, a pull buckle, a locking buckle 18, a back-moving spring 110 and a limit pin 194. The bracket 17 includes a horizontal section and an upward extending section fixed on the top of the post insulator 15 provided with the upper contact 12, and the upward extending section There is an opening for accommodating the buckle 18 and a lock hole 171 on the top. The buckle is pivotally connected to the knife 11 through a first rotating shaft 193, and a sleeve 195 is sleeved on the first rotating shaft 193. The buckle includes a The upper pull ring 191, the lower hole 192 at its lower part and the pick finger 196 on the left side of the lower hole 192, the lock catch 18 is pivotally connected to the free end of the knife 11 through the second rotating shaft 181, and the lock catch 18 includes a Its right side is against the stopper 183 on the pull finger 196, and the lock hook 182 located at the bottom of the lock 18 and matched with the lock hole 171 of the bracket 17. One end of the return spring 110 is set on the first rotating shaft 193 on the shaft sleeve 195, the other end is pressed on the stop part 183 of the lock buckle 18, the limit pin 194 is set on the switch knife 11, and penetrates in the lower hole 192, and the middle part of the return spring 110 is against the limit pin. bit below pin 194.

Please refer to Fig. 2, the utility model fully insulated lightning arrester 1 is installed on the tower 4, the top 4 of the tower is provided with an insulator 41 and the bottom is provided with a ground cable 2, the overhead line 3 is erected on the top of the insulator 41, and the upper contact 12 The cable 31 with an AMP connector 32 is connected to the overhead cable 3 , and the lower contact 13 is connected to the ground cable 2 .

When it is necessary to open the gate, the crotch of the insulating hook rod penetrates into the pull ring 191 of the pull buckle and pulls it downward. , the switch knife 11 remains motionless, and the pull buckle rotates around the first rotating shaft 193 of the fulcrum (because the diameter of the lower hole 192 is greater than the diameter of the limit pin 194, so the limit pin 194 has an appropriate position in the lower hole 192 of the pull buckle. Displacement space), the return spring 110 is compressed, and the picking finger 196 at the front end of the pull buckle moves the stopper 183 of the lock buckle 18, so that the lock buckle 18 rotates around the second rotating shaft 181, and the lock hook 182 of the lock buckle 18 moves from the bracket 17 is disengaged from the lock hole 171, and at the same time, the left end of the lock catch 18 is in contact with the closing stop, so that the switch knife 11 is pulled open, and the free end of the switch knife 11 is separated from the upper contact 12, and the switch knife 11 continues to surround the first contact. A shaft 193 rotates. The contact piece 162 fixed together with the switch knife 11 is also separated from the contact finger 161 fixed on the arrester 16. When the switch knife 11 is displaced to the stop position 131, the entire opening process is completed. A visible isolation fracture is formed between the fingers 161 . The lightning arrester 16 is also separated from the conductive main circuit.

During closing operation, due to the action of the back-moving spring 110, the contact surface of the lower hole 192 of the pull buckle and the limit pin 194 is close to each other. In this way, the operating force of the insulating hook rod acts directly on the switch knife 11, causing the switch knife 11 to rotate around the hinged end. The contact piece 162 fixed on the switch knife 11 first contacts the contact finger 161 fixed on the arrester 16 to realize electrical connection. The switch knife 11 continues to rotate, and the contact between the switch knife 11 and the upper contact 12 realizes the electrical connection of the conductive main circuit. During this process, the lock hook 182 of the lock catch 18 will slide into the lock hole 171 of the bracket 17 around the second rotating shaft 181 under the action of the return spring 110, so as to realize the locking of the switch knife 11 and the upper contact 12, ensuring the product When it is installed obliquely or inverted, it will not trip due to its own weight, vibration and electrodynamic force, causing accidents.

In the closed state, the high-voltage end current passes through the upper contact, and the switch knife is connected to the overhead cable and is insulated from the ground to complete the power transmission. When a lightning strike or operating overvoltage occurs, the arrester, which usually exhibits insulating properties, exhibits its excellent nonlinear characteristics, and its internal excellent metal oxide resistors quickly show a transformation from high resistance to low resistance, and a small increase in voltage will cause The current increases suddenly by several orders of magnitude. At this time, the arrester changes from the insulator characteristic to the conductor characteristic. The overvoltage is released to the earth through the arrester. As a result, the resistance increases sharply, and the arrester changes from the conductor characteristic to the insulator characteristic, thereby maintaining the normal working state of the power system.

At the same time, the utility model also has more functions than the traditional lightning arrester. The first major feature: when the line is undergoing maintenance and inspection, the switch knife can be opened to form a visible fracture to ensure the personal safety of the construction personnel on site, and it plays the role of an isolating switch. If it is operated with a load breaker, live work can also be implemented, and the load can be separated from the power grid with the fastest speed and the smallest blackout range; the second major feature: when the line is in a no-load situation for a long time, The switch knife can also be opened to separate the arrester from the continuous operating voltage, reduce the aging process of the arrester, improve its service life and power supply reliability; the third major feature is that when an underground cable fails, it can help quickly find the fault point brings incomparable advantages.

The above embodiments are only for illustrating the utility model, rather than limiting the utility model. Those skilled in the art can also make various transformations or modifications without departing from the spirit and scope of the utility model. Therefore, all equivalent technical solutions should also belong to the category of the present utility model, and should be defined by each claim.

Claims (2)

1. a protection cable is with can deciliter all insulation lightning arrester, be installed on shaft tower, described head of mast is provided with insulator and bottom is provided with into ground cable, overhead transmission line is set up in the top of described insulator, described all insulation lightning arrester comprises underframe, plug-in strip, post insulator, upper contact head, lower contact, locker, described post insulator is located at the both sides of described underframe symmetrically, one end of described plug-in strip and lower contact are hinged, the other end is free end and contacts with described upper contact head, described locker is installed on the free end and post insulator of described plug-in strip, it is characterized in that, described all insulation lightning arrester also comprises the lightning arrester of being located between described post insulator, the lower end of this lightning arrester is fixed on described underframe, and its upper end is provided with fingertip, on described plug-in strip, be located at the contact coordinating with described fingertip,

Described upper contact head is by being connected with described aerial cable with the cable of the general joint of peace;

Described lower contact with described in enter ground cable be connected.

2. a kind of protection cable as claimed in claim 1 is with can deciliter all insulation lightning arrester, it is characterized in that, described locker comprises support, pulling buckle, snap close, back-moving spring and spacer pin, described support comprises the horizontal segment on the post insulator top that is provided with upper contact head described in being fixed on and extension upwards, on described upwards extension, offer opening and a lockhole for holding described snap close, described pulling buckle is articulated on described plug-in strip by the first rotating shaft, and be arranged with axle sleeve in this first rotating shaft, described pulling buckle comprises the draw ring of the portion of being located thereon, be positioned at the lower hole of its underpart and be positioned at the finger of choosing in this left side, lower hole, described snap close is articulated in by the second rotating shaft on the free end of described plug-in strip, described snap close comprises being positioned at its right side and being resisted against described pulling buckle chooses the stop block portion on finger, and the latch hook that is positioned at this snap close bottom and coordinates with the lockhole of described support, one end of described back-moving spring is erected on the axle sleeve of described the first rotating shaft, the other end is installed with in described snap close stop block portion, described spacer pin is located on described plug-in strip, and be arranged in described lower hole, the middle part of described back-moving spring is resisted against the below of described spacer pin.