CN207518244U - A kind of 220kV double backs overhead transmission line cable cut-offs bar - Google Patents

Abstract

The utility model relates to a 220kV double-circuit overhead line cable breaker bar, which solves the defects that the cable breaking scheme of the double-circuit overhead line is too complicated and the power failure time is long compared with the prior art. The first circuit cross-arm assembly of the present utility model includes terminal cross-arms, lower jumper cross-arms, middle jumper cross-arms and upper jumper cross-arms which are installed sequentially from bottom to top based on the cable terminal rods. There are 3 cable terminals installed at the bottom, 3 lower fittings strings are installed at the end of the lower jumper cross-arm, the 3 lower fittings strings and the lower jumper cross-arm are arranged in a "ten" shape, and the end of the middle jumper cross-arm There are 2 medium tension strings installed, and the 2 medium tension strings are arranged vertically based on the cross arm of the middle jumper, and 2 upper tension strings are installed at the end of the upper jumper cross arm, and the 2 upper tension strings are based on The upper jumper crossarm is arranged vertically. The utility model does not need to erect a tower under the 220kV double-circuit line to be disconnected, and avoids the influence caused by long-term power failure.

Description

A 220kV double-circuit overhead line cable breaking rod

technical field

The utility model relates to the technical field of cable terminal towers, in particular to a 220kV double-circuit overhead line cable breaking rod.

Background technique

In the prior art, in domestic 220kV ultra-high voltage line projects, in order to use cables to break double-circuit overhead lines, a scheme of building one or two base cable terminal towers under the double-circuit lines is usually adopted. It needs to erect the tower offline, cut off the conductor and ground wire of the line to be disconnected, and re-crimp the conductor and ground wire on the newly built cable terminal tower.

This breaking construction method needs to go through the construction cycle of foundation excavation, fabrication, maintenance, tower assembly and wiring under the line to be broken. The construction plan is complicated, the power outage time is long, and the investment increase is large. And some lines cannot be blacked out for a long time due to special reasons, which affects the stable operation of the power grid system.

Therefore, how to quickly and conveniently disconnect the double-circuit overhead line for the cable line has become a technical problem to be overcome.

Utility model content

The purpose of this utility model is to provide a 220kV double-circuit overhead line cable breaking rod to solve the above-mentioned problems in order to solve the defects that the cable breaking scheme of the double-circuit overhead line is too complicated and the power failure time is long in the prior art.

In order to achieve the above object, the technical scheme of the utility model is as follows:

A 220kV double-circuit overhead line cable breaking bar, including a cable terminal bar, the cable terminal bar is equipped with a first circuit cross arm assembly and a second circuit cross arm assembly, the first circuit cross arm assembly and the second circuit cross arm assembly The structure of the two arm components is the same and corresponds to the mirror image based on the cable terminal pole. The bottom of the cable terminal pole is connected to the first loop and the second loop. Take out the component;

The first circuit cross-arm assembly includes a terminal cross-arm, a lower jumper cross-arm, a middle jumper cross-arm and an upper jumper cross-arm installed sequentially from bottom to top based on the cable terminal pole, and the end of the terminal cross-arm There are 3 cable terminals installed, 3 lower fittings strings are installed at the end of the lower jumper cross arm, the 3 lower fittings strings and the lower jumper cross arm are arranged in a "ten" shape, and the end of the middle jumper cross arm is installed There are 2 medium tension strings, and the 2 medium tension strings are arranged vertically based on the middle jumper cross arm, and the end of the upper jumper cross arm is installed with 2 upper tension strings, and the 2 upper tension strings are based on the upper The jumper crossarm is arranged vertically.

Also includes the tension tower to be broken, the distance between the tension tower to be broken and the cable terminal pole is 15-20m, the three phases of the first circuit are respectively introduced into 3 cable terminals, and the wires drawn from the 3 cable terminals are respectively led To the 3 lower fitting strings, lead the overhead wires from the lower fitting strings of the tension tower to be broken to the tension tower to be broken, and lead the wires from the other 2 lower fitting strings out of the 3 lower fitting strings to the 2 One of the middle tension strings leads overhead wires towards the middle tension string of the tension tower to be broken and connects to the tension tower to be broken, and the wire drawn from the other middle tension string of the two middle tension strings leads to the top The tension string passes through another upper tension string and leads to the tension tower to be broken.

The lower fittings string is a rod-type fittings string, and the middle and upper straining strings are both rod-type straining strings.

The first circuit cross-arm assembly also includes a lightning arrester installation cross-arm, the lightning arrester installation cross-arm is located between the terminal cross-arm and the lower jumper cross-arm, and the end of the lightning arrester installation cross-arm is installed with 3 lightning arresters and 3 lead fittings The wires drawn from the 3 cable terminals are respectively led to the 3 lower fittings strings through 3 lead fittings strings, and the wires led from the 3 lead fittings strings to the 3 lower fittings strings are respectively introduced into 3 lightning arresters through jumpers.

The overhead wires drawn out from the lower fittings string are connected to the disc-type insulator tension strings of the tension tower to be broken through T-shaped connection clamps, and the overhead wires led out from the lower fittings strings are also equipped with parallel groove clamps, and the lower fittings The overhead conductors drawn out from the series are led through parallel trench clamps to the lead-out conductors of the tension strings of disc insulators connected to it.

Beneficial effect

Compared with the prior art, a 220kV double-circuit overhead line cable breaking rod of the utility model does not need to erect a tower under the 220kV double-circuit line to be broken, thereby avoiding the influence caused by long-term power failure. The utility model sets up a cable terminal rod near the 220kV double-circuit line to be broken, designs a cross-arm type insulator tension string on the cable terminal rod, and adopts a wire T-connecting clip and a parallel trench on the tension tower of the line to be broken. The design of the connection between the clamp and the wire not only ensures the reliable connection and conduction performance of the wire, but also avoids the tension of the wire in the newly built line section caused by the use of conventional disc insulators in tension series to connect the pole tower and the weight of the wire tension series. Too large, exceeding the design conditions of the original line tower.

The utility model can be used in the vicinity of any 220kV tension tower, the design and construction scheme is simple, no long-term power outage is required, the construction scheme for cable disconnection of 220kV overhead lines is simplified, and the safe and stable operation of the 220kV lines is guaranteed.

Description of drawings

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

Fig. 2 is the structural representation of the installation cross arm of the utility model without lightning arrester;

Fig. 3 is a schematic diagram of the installation structure of the lightning arrester installation cross arm and the lightning arrester in the utility model;

Fig. 4 is the schematic diagram of the installation structure of parallel ditch line clip and T connection clip in the utility model;

Among them, 1-cable terminal rod, 2-first loop, 3-second loop, 4-terminal cross arm, 5-lower jumper cross arm, 6-middle jumper cross arm, 7-upper jumper cross arm, 8-cable terminal, 9-lower fitting string, 10-medium tension string, 11-upper tension string, 12-tension tower to be broken, 13-arrester installation crossarm, 14-arrester, 15-lead wire fitting string , 16-disc insulator tension string, 17-parallel ditch clamp, 18-T-type clamp, 19-first circuit cross-arm assembly, 20-second circuit cross-arm assembly, 21-ground wire.

Detailed ways

In order to have a further understanding and understanding of the structural features and the achieved effects of the utility model, a detailed description is provided in conjunction with preferred embodiments and accompanying drawings, as follows:

As shown in FIG. 1 , a 220kV double-circuit overhead line cable disconnecting rod described in the present invention includes a cable terminal rod 1 . The cable terminal pole 1 is equipped with a first circuit cross arm assembly 19 and a second circuit cross arm assembly 20, the first circuit cross arm assembly 19 and the second circuit cross arm assembly 20 are respectively used for 220kV double circuits, the first circuit cross arm assembly 19 and the second circuit cross arm assembly 20 both have the same structure and are mirror images based on the cable terminal rod 1 . The bottom of the cable terminal pole 1 is connected to the first loop 2 and the second loop 3, the first loop 2 and the second loop 3 form a 220kV double loop, the first loop 2 is drawn out through the first loop cross arm assembly 19, the second loop 3 Leading out through the second circuit cross-arm assembly 20, the two circuits can be broken in two directions for the tension tower 12 to be broken.

As shown in FIG. 2 , the first circuit cross arm assembly 19 includes terminal cross arms 4 , lower jumper cross arms 5 , middle jumper cross arms 6 and upper jumper cross arms 7 which are installed sequentially from bottom to top based on the cable terminal pole 1 . Three cable terminals 8 are installed at the end of the terminal cross arm 4 , and the cable terminals 8 are used for cable access of the first loop 2 . Three lower fitting strings 9 are installed at the end of the lower jumper cross arm 5, and the three lower fitting strings 9 are arranged in the shape of a "ten" with the lower jumper cross arm 5, so as to realize the upward leading of wires in four different directions and satisfy the Corresponding spacing requirements between conductors.

Two medium-resistant tension strings 10 are installed on the end of the jumper cross-arm 6, and the two medium-resistant tension strings 10 are arranged vertically based on the middle jumper cross-arm 6, and the two medium-resistant tension strings 10 are used for the connection of two wires. Cited above. Two upper tension strings 11 are installed on the end of the upper jumper cross arm 7, and the two upper tension strings 11 are arranged vertically based on the upper jumper cross arm 7, and the two upper tension strings 11 are used for the uppermost wire. Jumper function. In practical application, a ground wire crossarm can also be installed on the top of the cable terminal pole 1, and a ground wire 21 can be installed between the cable terminal pole 1 and the tension tower 12 to be disconnected in a conventional manner in the prior art.

As shown in Figure 2, the tension tower 12 to be disconnected is the line tower ready to be disconnected, and the side opposite the tension tower 12 to be disconnected and the cable terminal rod 1 is the line to be disconnected, and the tension tower to be disconnected is the line tower to be disconnected. The other side of the tower 12 away from the cable terminal pole 1 is the unbroken circuit. The distance between the tension tower 12 to be disconnected and the cable terminal pole 1 is 15-20m. In practical applications, the construction of the cable terminal pole 1 is carried out at a distance of 15-20m from the tension tower 12 to be disconnected. In case of a power outage, only a brief power outage is required when the wire jumper and ground wire are connected.

The three phases of the first circuit 2 are respectively introduced into three cable terminals 8, and the wires drawn from the three cable terminals 8 are respectively led to three lower fitting strings 9, and among the three lower fitting strings 9, the wires facing the tension tower 12 to be broken The lower fittings string 9 leads the overhead wire to the tension tower 12 to be disconnected, and this overhead wire is used as the lowest one-phase wire of the three phases. The wires drawn from the other two lower fitting strings 9 among the three lower fitting strings 9 are respectively led to two medium tension strings 10 for the upper, middle and lower layered arrangement of the three-phase wires. Among the two medium tension strings 10, the medium tension string 10 facing the tension tower 12 to be disconnected draws an overhead wire to the tension tower 12 to be disconnected, and the overhead wire is the middle phase wire of the three phases. The wire drawn from the other one of the two middle tension strings 10 leads to the upper tension string 11, and after the transition of the other upper tension string 11, leads to the tension tower 12 to be broken. The uppermost phase conductor arrangement of the three phases. The jumper connection mode of the second loop 3 is the same, as shown in FIG. 1 and FIG. 2 , thereby realizing the breaking operation processing for the strain tower 12 to be broken.

In practical applications, a lightning arrester 14 can also be added. As shown in FIG. 3 , the cable terminal pole 1 can also be equipped with an arrester installation cross arm 13 , and the arrester installation cross arm 13 is located between the terminal cross arm 4 and the lower jumper cross arm 5 . The end of the surge arrester installation cross arm 13 is equipped with 3 lightning arresters 14 and 3 lead wire fittings strings 15, the 3 lead wire fittings strings 15 are used for lead wires, and the wires drawn from the 3 cable terminals 8 are led to the Three lower fittings strings 9. Three lead fittings strings 15 lead to three lightning arresters 14 through jumper wires to the wires of the three lower fittings strings 9, so as to realize the lightning protection effect of the first circuit 2 and three phases.

Here, the lower fitting string 9 may be a rod-type fitting string, and the middle tension string 10 and the upper tension string 11 may both be rod-type tension strings. Since the tension tower of the line to be disconnected needs to be connected with the conductor of the new line section, if both ends of the new conductor of this section adopt the design scheme of the tension string of the conventional disc insulator. Each string of the tension string has a large mass and a long length, which will lead to excessive tension of the conductors, and this scheme needs to be carried out by traction construction, which will further increase the tension of the conductors during the construction stage, and the tension of the conductors will exceed the tensile strength of the line to be disconnected. The scope of use of the tower, causing safety hazards and even accidents. Therefore, rod-type fittings strings and rod-type tension strings can be used in the newly-built cable terminal rod 1, so that one end of the conductor is rigidly fixed on the cable terminal rod 1, and the other end is connected to the wire tension clamp in the traditional way by connecting plates and fittings. Has no effect on wire tension.

At the same time, the overhead wires drawn from the lower fittings string 9 are connected to the disc-shaped insulator tension strings 16 of the tension tower 12 to be disconnected through the T-shaped clamp 18, and the overhead wires led out from the lower fittings string 9 are also equipped with parallel trench wires. Clamp 17, the overhead wire drawn from the lower fitting string 9 leads through the parallel ditch clamp 17 to the lead wire of the disc insulator tension string 16 connected to it. By adopting the parallel groove clamp 17 for connection, the impact of the conventional wire tension resistance and string weight on the wire tension is also avoided. In order to ensure that the position of the T contact point will not cause open circuit hazards due to high resistance and long-term heating, the design of the lead wires from the parallel ditch clamp 17 to the connected disc insulator tension string 16 is also used to make the parallel ditch clamp 7 and a section of lead for drainage.

In actual use, when it is necessary to perform breaking operations on the tension tower 12 to be broken, the construction of the cable terminal rod 1 is carried out 15-20m away from it, without long-term power failure. After the first circuit 2 and the second circuit 3 on the tension tower 12 to be disconnected are respectively installed in the first circuit cross-arm assembly 19 and the second circuit cross-arm assembly 20, a short-term power failure is performed, and the first circuit cross-arm The corresponding wires of the component 19 and the second circuit cross-arm component 20 are led to the tension tower 12 to be broken, so as to realize the breaking operation on one side of the tension tower 12 to be broken.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the industry should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions describe only the principle of the utility model. There will be various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The protection scope required by the utility model is defined by the appended claims and their equivalents.

Claims (5)

1. a kind of 220kV double backs overhead transmission line cable cut-offs bar, including cable terminal pole (1), it is characterised in that：The cable Terminal pole (1) is equipped with the first circuit cross biling assembly (19) and second servo loop cross biling assembly (20), the first circuit cross biling assembly (19) it is identical with both second servo loop cross biling assemblies (20) structure and corresponding in mirror image based on cable terminal pole (1), cable termination The bottom of bar (1) picks out the first circuit (2) and second servo loop (3), and the first circuit (2) draw through the first circuit cross biling assembly (19) Go out, second servo loop (3) is drawn through second servo loop cross biling assembly (20)；

The terminal cross-arm that the first circuit cross biling assembly (19) is installed successively from the bottom to top including being based on cable terminal pole (1) (4), lower wire jumper cross-arm (5), middle wire jumper cross-arm (6) and upper wire jumper cross-arm (7), the end of the terminal cross-arm (4) are equipped with 3 Cable termination (8), the end of lower wire jumper cross-arm (5) are equipped with 3 lower hardware strings (9), and 3 lower hardware strings (9) are horizontal with lower wire jumper It carries on a shoulder pole (5) and arranges that the end of middle wire jumper cross-arm (6) is equipped with 2 middle strain insulator-strings (10), 2 middle strain insulator-strings (10) in " ten " font It is based on middle wire jumper cross-arm (6) to be arranged vertically, the end of upper wire jumper cross-arm (7) is equipped with 2 upper strain insulator-strings (11), and 2 upper resistance to String (11) is based on wire jumper cross-arm (7) and is arranged vertically.

2. a kind of 220kV double backs overhead transmission line cable according to claim 1 cut-offs bar, it is characterised in that：It further includes and treats Cut-off anchor support (12), anchor support (12) to be cut-off and cable terminal pole (1) at a distance of 15-20m, first circuit (2) Three-phase introduces 3 cable terminations (8) respectively, and the conducting wire drawn from 3 cable terminations (8) is respectively led into 3 lower hardware strings (9), Aerial condutor, which is drawn, towards the lower hardware string (9) of anchor support to be cut-off (12) is connected to anchor support (12) to be cut-off, 3 lower hardware strings (9) conducting wire that another 2 lower hardware strings (9) in are drawn is respectively led into 2 middle strain insulator-strings (10), towards anchor support to be cut-off (12) Middle strain insulator-string (10) draw aerial condutor and be connected to anchor support (12) to be cut-off, another 1 middle strain insulator in 2 middle strain insulator-strings (10) The conducting wire that string (10) is drawn leads to strain insulator-string (11) and leads to anchor support to be cut-off after another upper strain insulator-string (11) transition (12)。

3. a kind of 220kV double backs overhead transmission line cable according to claim 1 cut-offs bar, it is characterised in that：Under described Hardware string (9) is bar type hardware string, and the middle strain insulator-string (10) and upper strain insulator-string (11) are bar type strain insulator-string.

4. a kind of 220kV double backs overhead transmission line cable according to claim 1 cut-offs bar, it is characterised in that：Described Primary Ioops cross biling assembly (19) further includes arrester installation cross-arm (13), and arrester installation cross-arm (13) is positioned at terminal cross-arm (4) Between lower wire jumper cross-arm (5), the end of arrester installation cross-arm (13) is equipped with 3 arresters (14) and 3 lead gold utensils It goes here and there (15), the conducting wire that 3 cable terminations (8) are drawn leads to 3 lower hardware strings (9) through 3 lead hardware strings (15) respectively, 3 Lead hardware string (15) is led on the conducting wire of 3 lower hardware strings (9) introduces 3 arresters (14) respectively by wire jumper.

5. a kind of 220kV double backs overhead transmission line cable according to claim 2 cut-offs bar, it is characterised in that：Under described The aerial condutor that hardware string (9) is drawn is connected on the dish-type insulator strain of anchor support (12) to be cut-off by T-shaped binding clip (18) It goes here and there on (16), parallel groove clamp (17), the frame that lower hardware string (9) is drawn is also equipped on the aerial condutor that lower hardware string (9) is drawn In extraction wire of the hollow wire by parallel groove clamp (17) lead to coupled dish-type insulator resistant string (16).