CN107086439B - Special hardware structure for grid-side incoming line of converter transformer - Google Patents

Abstract

The present invention discloses a special hardware structure for the grid-side incoming line of a converter transformer, which are all located on a firewall (12). The two ends of the upper crossover (8) are fixed to the transmission tower through the tension insulator string (11). A down conductor (7) is arranged at the transition section between the upper crossover (8) and the tension insulator string (11). The other end of the down conductor (7) is connected to a first tube mother section (9) arranged below. The two ends of the first tube mother section (9) are overlapped on the support insulator (5) and the lightning arrester connecting line terminal (6). A second tube mother section (10) is arranged on the same horizontal line as the first tube mother section (9). The two ends of the second tube mother section (10) are overlapped on the support insulator (5) and the radio interference filter capacitor (4). It overcomes the disadvantages of the prior art that the transformer bushing bears static load for a long time, which will aggravate the aging of the equipment and shorten the service life. It has the advantages of improving the operation reliability and stability of the ultra-high voltage converter station.

Description

Special hardware structure for grid-side incoming line of converter transformer

Technical Field

The invention relates to the technical field of direct current power transmission engineering, and more specifically to a special hardware structure for a grid-side incoming line of a converter transformer.

Background technique

Transformers are the core components of substations and converter stations. In 1000kV AC UHV substations, the transformer bushing inlet line adopts four-split large-diameter conductors. The conductors are thick in diameter and rigid, which puts a large load on the transformer bushing terminals. In the AC layered 1000/500kV power system UHV converter station, the connection method of the converter transformer to the 1000kV AC grid side is similar to that of the AC UHV substation. During the operation of the project, the transformer bushing is subjected to static load for a long time, which will aggravate the aging of the equipment and shorten its service life. It may even cause the equipment terminal to break or the top of the bushing to deform, thus causing serious accidents such as gas leakage and internal discharge of the bushing.

Summary of the invention

The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and to propose a special hardware structure for the grid-side incoming line of a converter transformer.

The object of the present invention is implemented through the following technical scheme: a dedicated hardware structure for the grid-side incoming line of a converter transformer is located on a firewall, and includes a converter transformer bushing hardware, a tube mother segment hardware, a converter transformer grid-side bushing terminal, a radio interference filter capacitor, a support insulator, a lightning arrester terminal, a down conductor, an upper crossover line, a first tube mother segment, a second tube mother segment and a tension insulator string;

The two ends of the upper crossover are fixed to the transmission tower through the tension insulator string. A down conductor is arranged at the transition section between the upper crossover and the tension insulator string. The other end of the down conductor is connected to the first female tube section arranged below. The two ends of the first female tube section are overlapped on the support insulator and the lightning arrester connecting wire terminal. A second female tube section is arranged on the same horizontal line as the first female tube section. The two ends of the second female tube section are overlapped on the support insulator and the radio interference filter capacitor. The radio interference filter capacitor is connected to the converter transformer grid-side bushing terminal arranged on one side through the converter transformer bushing hardware.

In the above technical solution: the first tube mother section and the second tube mother section are connected by a movable tube mother segment hardware.

In the above technical solution: the interior of the tube mother segmented hardware is made of multiple strands of small-diameter soft copper wires or soft aluminum wires.

In the above technical scheme: the two ends of the converter transformer bushing fitting are made of multiple strands of small-diameter soft copper wire or soft aluminum wire, and are respectively movably connected to the converter transformer grid-side bushing terminal and the radio interference filter capacitor; a pre-bent tube mother structure is used in the middle of the converter transformer bushing fitting.

In the above technical solution: the converter transformer bushing fittings and the radio interference filter capacitor are connected by hinged connection.

In the above technical solution: the support insulator is located between the radio interference filter capacitor and the lightning arrester terminal.

The present invention has the following advantages: the present invention protects the bushing connection terminals on the grid side of the converter transformer, avoids deformation, breakage and other accidents of the bushing connection terminals on the grid side due to long-term heavy mechanical load, thereby improving the operating reliability and stability of the UHV converter station.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an isometric view of the present invention.

FIG. 2 is a front view of the present invention.

FIG. 3 is a side view of the invention.

Figure 4 is a top view of the invention.

In the figure: converter transformer bushing fittings 1, mother tube segment fittings 2, converter transformer grid-side bushing terminal 3, radio interference filter capacitor 4, post insulator 5, lightning arrester terminal 6, down conductor 7, upper cross-over line 8, first mother tube section 9, second mother tube section 10, tension insulator string 11.

Detailed ways

The following describes the implementation of the present invention in detail with reference to the accompanying drawings, but they do not constitute a limitation of the present invention and are only used as examples. At the same time, the advantages of the present invention will become clearer and easier to understand through the description.

As shown in Figures 1-4: the dedicated hardware structure for the grid-side incoming line of the converter transformer is located on the firewall 12, and includes the converter transformer bushing hardware 1, the tube mother segment hardware 2, the converter transformer grid-side bushing terminal 3, the radio interference filter capacitor 4, the support insulator 5, the lightning arrester terminal 6, the down conductor 7, the upper cross-over line 8, the first tube mother section 9, the second tube mother section 10 and the tension insulator string 11;

Both ends of the upper crossover wire 8 are fixed to the transmission tower through the tension insulator string 11. A down conductor 7 is arranged at the transition section between the upper crossover wire 8 and the tension insulator string 11. The down conductor 7 guides the current to the first mother tube section 9.

The other end of the down conductor 7 is connected to the first female tube section 9 arranged below, and the two ends of the first female tube section 9 are overlapped on the support insulator 5 and the lightning arrester connecting wire terminal 6. A second female tube section 10 is arranged on the same horizontal line as the first female tube section 9, and the two ends of the second female tube section 10 are overlapped on the support insulator 5 and the radio interference filter capacitor 4. The radio interference filter capacitor 4 is connected to the converter transformer grid-side bushing terminal 3 arranged on one side through the converter transformer bushing hardware 1.

The first tube mother section 9 and the second tube mother section 10 are connected via a movable tube mother segment hardware 2 .

The interior of the tube mother segmented hardware 2 is made of multiple strands of small-diameter soft copper wires or soft aluminum wires to form a reliable electrical connection.

Both ends of the converter transformer bushing fitting 1 are made of multiple strands of small-diameter soft copper wires or soft aluminum wires to form a reliable electrical connection.

The converter transformer bushing fitting 1 is movably connected to the converter transformer grid-side bushing terminal 3 and the radio interference filter capacitor 4 respectively; a pre-bent tube mother structure is adopted in the middle of the converter transformer bushing fitting 1, which effectively reduces the metal body volume and has strong adaptability to the grading rings of the equipment at both ends of the fitting.

The converter transformer bushing fitting 1 and the radio interference filter capacitor 4 are connected by hinged connection.

When the converter transformer bushing fittings 1 and the mother tube segment fittings 2 are greatly displaced by external factors such as strong winds and ice on the upper crossover line 8, the converter transformer grid-side bushing terminal 3 does not form relative displacement and does not bear the mechanical load caused thereby. Under earthquake conditions, the various devices are all non-fixedly connected, which can also effectively absorb earthquake stress and protect the firm connection of the equipment terminals.

The support insulator 5 is located between the radio interference filter capacitor 4 and the lightning arrester terminal 6 .

The parts not described in detail above are all prior art.

Claims (6)

1. A special hardware structure for the grid-side incoming line of a converter transformer, all of which are located on a firewall (12), and characterized in that it comprises a converter transformer bushing hardware (1), a tube mother segment hardware (2), a converter transformer grid-side bushing connection terminal (3), a radio interference filter capacitor (4), a support insulator (5), a lightning arrester connection terminal (6), a down conductor (7), an upper crossover line (8), a first tube mother segment (9), a second tube mother segment (10) and a tension insulator string (11); The two ends of the upper crossover (8) are fixed to the transmission tower through the tension insulator string (11); a down conductor (7) is arranged at the transition section between the upper crossover (8) and the tension insulator string (11); the other end of the down conductor (7) is connected to a first tube mother section (9) arranged below; the two ends of the first tube mother section (9) are overlapped on the support insulator (5) and the lightning arrester terminal (6); a second tube mother section (10) is arranged on the same horizontal line as the first tube mother section (9); the two ends of the second tube mother section (10) are overlapped on the support insulator (5) and the radio interference filter capacitor (4); the radio interference filter capacitor (4) is connected to the converter transformer grid-side bushing terminal (3) arranged on one side through the converter transformer bushing hardware (1). 2. According to the special hardware structure for the grid-side incoming line of the converter transformer according to claim 1, it is characterized in that the first mother tube section (9) and the second mother tube section (10) are connected by a movable mother tube segment hardware (2). 3. The special hardware structure for the grid-side incoming line of the converter transformer according to claim 1 or 2 is characterized in that the interior of the tube mother segmented hardware (2) is made of multiple strands of soft copper wire or soft aluminum wire. 4. According to claim 3, the special hardware structure for the grid-side incoming line of the converter transformer is characterized in that: the two ends of the converter transformer bushing hardware (1) are made of multiple strands of soft copper wire or soft aluminum wire, and are movably connected to the converter transformer grid-side bushing terminal (3) and the radio interference filter capacitor (4) respectively; a pre-bent tube mother structure is used in the middle of the converter transformer bushing hardware (1). 5. The dedicated hardware structure for the grid-side incoming line of the converter transformer according to claim 4 is characterized in that the converter transformer bushing hardware (1) and the radio interference filter capacitor (4) are connected by hinged connection. 6. The dedicated hardware structure for the grid-side incoming line of the converter transformer according to claim 5 is characterized in that the post insulator (5) is located between the radio interference filter capacitor (4) and the arrester terminal (6).