CN103904564B - High-voltage distribution device with double breakers used for single bus segmentation and application thereof - Google Patents

Abstract

The present invention relates to a high-voltage power distribution device, in particular to a high-voltage power distribution device with double circuit breakers as a single busbar segment and its application. The high-voltage power distribution device with double circuit breakers as a single busbar segment is creatively proposed A segmented circuit with a main transformer and a power supply line, which includes a first circuit breaker 1CBF, a second circuit breaker 2CBF and an intermediate node; the two circuit breakers are respectively connected to the two busbars of the segment, and the intermediate node is passed through a disconnector 2GB is connected to #2 main transformer. The high-voltage power distribution device described above can be applied to new projects, and can also be applied to old projects that have been put into operation through transformation. The advantages of the present invention are: adopting the structural form of symmetrical distribution of circuits, so that the power supply of the power supply and the number of circuits can be effectively coordinated; it can ensure that there are two pairs of incoming lines of the power supply (main transformer) under various possible accidents and maintenance states. The effective power supply of the load of the substation really and effectively guarantees the reliability and stability of the power supply of the power distribution device.

Description

High-voltage power distribution device with double circuit breakers as single busbar section and its application

technical field

The invention relates to a high-voltage power distribution device, in particular to a high-voltage power distribution device with double circuit breakers as a single busbar segment and its application. It is suitable for substation design with 4 to 5 outgoing lines and 3 main transformers.

Background technique

In the design of 35kV-110kV substation, according to GB50059-2011 "35kV-110kV Substation Design Code", Article 3.2.3 "35kV-110kV electrical wiring should adopt bridge shape, enlarged bridge shape, line transformer group or line branch wiring, Wiring of single busbar or single busbar section.", Article 3.2.4 "When 35kV-66kV lines have 8 circuits or more, double busbar wiring should be used. When 110kV lines have 6 circuits or more, double busbar wiring should be used" . According to DL/T5218-2005 "Technical Regulations for Design of 220kV-500kV Substations", paragraph 3 of Article 7.1.4, "For 110kV and 66kV power distribution devices (or 35kV power distribution devices) in 220kV substations, when the outlet When the number of circuits is less than 6 (or 4-7), it is advisable to use single-bus or single-bus section wiring, and when it is 6 or more (or 8 or more), it is advisable to use double-bus wiring."

The single bus section refers to: the bus is divided into two sections, and the two sections are connected by a section circuit breaker. When the 110kV outgoing line in the substation is 4-5 circuits, and the main transformer is 3 sets When using single-bus section wiring, as shown in Figure 10 and Figure 11, there will be two sections, one of which is connected to 2 main transformers or 2 power supply lines. If this section encounters a bus failure Or when it is overhauled, the two main transformers or the two power supply lines where it is located will withdraw from operation. At this time, the power supply capacity of the 110kV substation will be sharply reduced by more than 50%, thus causing unnecessary losses to users. This is a problem to be solved in the design according to the current regulations. On the other hand, in the existing substations that have been built and put into operation, the floor area and equipment are fixed and cannot be changed at will, which limits the optimal design of substations. . Therefore, the existing design has disadvantages such as low reliability of power supply, poor flexibility, loss of load due to loss of load, and the like.

Contents of the invention

The object of the present invention is to provide a high-voltage power distribution device with double circuit breakers as single busbar section and its application with good power supply reliability and high stability based on the shortcomings of the prior art.

The high-voltage power distribution device with double circuit breakers as single busbar segment described in the present invention is realized through the following methods:

The high-voltage power distribution device with double circuit breakers as single bus section includes: the first section bus IM and the second section bus IIM, each section bus is connected with 2 return lines and 1 main transformer, connected to the first section bus The main transformers of the section bus IM and the second section bus IIM are respectively #1 main transformer and #3 main transformer, and each section bus has at least one return power line; the main points of its structure are: it also includes section A loop, which includes a first circuit breaker 1CBF, a second circuit breaker 2CBF and an intermediate node; one end of the first circuit breaker 1CBF is connected to the first section bus IM through the first isolating switch 1GF, and the other end is connected through the first current transformer 1CTF and the third isolating switch 3GF are connected to the intermediate node; similarly, one end of the second circuit breaker 2CBF is connected to the second section bus IIM through the second isolating switch 2GF, and the other end is connected through the second current transformer 2CTF and the fourth The isolation switch 4GF is connected to the intermediate node; and the intermediate node is connected to the #2 main transformer through the isolation switch 2GB.

In this way, the present invention breaks through the existing design regulations, and creatively proposes a segmented circuit with main transformer and power supply incoming line. When the 110kV outgoing line in the substation is 4 circuits, the main transformer is 3 sets, and a single busbar is used. In the design of double circuit breaker segmented wiring, #1 and #3 main transformers are respectively connected to the first segmental bus IM and the second segmental bus IIM, and the first segmental bus IM and the second segmental bus IIM It is powered by the incoming power cord. During normal operation, the circuit breakers 1CBF, 2CBF and isolating switches 1GF, 2GF, 3GF, 4GF on the sub-circuit are all closed, since the #2 main transformer passes through the first circuit breaker 1CBF and the second circuit breaker 2CBF respectively Connected to the first section bus IM and the second section bus IIM, so the power supplies on IM and IIM can supply power to #2 main transformer at the same time through the section circuit; when one of the section bus fails or is overhauled, only It is enough to disconnect the section circuit breaker connected to the section bus. At this time, the power supply of another section bus continues to supply power to #2 main transformer through another section circuit breaker.

The above technical solution is a high-voltage power distribution device when there are 4 outgoing lines in the substation, and it is also applicable to the design of a substation with 5 outgoing lines; when the 110kV outgoing lines in the substation are 5 lines, 3 of which are power lines, the The high-voltage power distribution device with double circuit breakers as single busbar section is specifically:

The first section bus IM and the second section bus IIM, each section bus is connected with 2 circuits and 1 main transformer, and the main transformers connected to the first section bus IM and the second section bus IIM are respectively It is #1 main transformer and #3 main transformer, and there is at least one return power line on each subsection bus; the key point of its structure is that it also includes a subsection circuit, which includes the first circuit breaker 1CBF, the second circuit breaker The circuit breaker 2CBF and the intermediate node, one end of the first circuit breaker 1CBF is connected to the first section bus IM through the first isolating switch 1GF, and the other end is connected to the intermediate node through the first current transformer 1CTF and the third isolating switch 3GF; Similarly, one end of the second circuit breaker 2CBF is connected to the second section bus IIM through the second isolating switch 2GF, and the other end is connected to the intermediate node through the second current transformer 2CTF and the fourth isolating switch 4GF; These are intermediate node 1 and intermediate node 2, intermediate node 1 is connected to #2 main transformer through isolating switch 2GB; intermediate node 2 is connected to a return power line, via the fifth isolating switch 5G, the third circuit breaker 3CB, and the third current mutual inductance 3CT and the seventh isolation switch 7G lead out.

In this way, when 110kV has 5 circuits, 3 of which are power lines, one of the power lines can also be connected to the intermediate node, and lead out through the circuit breaker and isolating switch. In this scheme, the number of circuit loops is an odd number. On the basis that the first subsection bus IM and the second subsection bus IIM are respectively connected with two circuits and are balanced, one extra circuit is connected to the subsection circuit.

The technical effects of the present invention are: firstly, when any section bus breaks down or is overhauled, the section bus will be disconnected, and the power supply line of another section bus and the third bus connected to the intermediate node will be disconnected. The power supply line supplies power to the main transformer on the subsection busbar and subsection circuit, avoiding the overload caused by the power supply of a single main transformer, and ensuring the reliability and stability of power supply. Secondly, the high-voltage power distribution device with double circuit breakers used as a single-bus segment in the present invention inspires the following power design: for a high-voltage power distribution device with a single bus segment, a structure with symmetrical distribution of circuits can be adopted, so that the power supply The power supply and the number of circuits can be effectively coordinated. However, in the prior art, when configuring 4 or 5 outlets, it is usually only possible to segment them in an average manner, that is, each segment is allocated 2 or 3 circuits, and the three main transformers can only be divided according to 1 One or two units are assigned to the two sections accordingly, resulting in the configuration of unbalanced power supply (main transformer) power supply for the same outlet circuit. And realize the disposition to above-mentioned circuit by the double circuit breaker with main transformer of the present invention as the subsection circuit of single bus section, then can use the main transformer and the 3rd power supply line in the subsection circuit as the middle adjustable power supply circuit, after a power failure on a segmented line, it can ensure that the two power supply (main transformer) incoming lines can effectively supply power to the load of the substation, so that the power supply and the outgoing line circuit can be fully adapted, which truly and effectively guarantees Reliability and stability of power supply for high-voltage power distribution devices.

When the double circuit breaker described in the present invention is used as a high-voltage power distribution device for single busbar segmentation, when it is applied to a new project, the specific steps are as follows:

Provide a technical solution for 110kV air-insulated power distribution devices with circuit breakers arranged in double rows with 4 outlets,

The first isolating switch 1GF, the first circuit breaker 1CBF, the first current transformer 1CTF and the third isolating switch 3GF are arranged longitudinally in order to form the first interval, while the second isolating switch 2GF, the second circuit breaker 2CBF, the second The current transformer 2CTF and the fourth isolating switch 4GF are arranged longitudinally in sequence to form the second compartment, the first compartment and the second compartment are parallel and juxtaposed, and are located between the first subsection bus IM and the second subsection bus IIM in the substation; Disconnect switch 2GB occupies a third bay, which is on the same longitudinal axis as the second bay;

The above-mentioned double circuit breaker section and the isolating switch 2GB connected to the #2 main transformer occupy three compartments. The third isolating switch 3GF and the fourth isolating switch 4GF are connected to 3GF and 4GF by erecting a crossing line through the framework.

Then erect a longitudinal spanning line I that spans the spanning line and the second section busbar IIM from above through the framework, and the longitudinal spanning line I is connected with the spanning line above the spanning line, and then vertically spans the second interval and the second section busbar IIM. Three intervals, and finally connected to #2 main transformer after the isolating switch 2GB.

When 110kV has 5 circuit lines, 3 of which are power lines, in addition to the above steps for 4 circuit lines, the following steps are also included in the application of new construction projects:

The power lines connected to the segmented circuit are vertically arranged according to the fifth isolating switch 5G, the third circuit breaker 3CB, the third current transformer 3CT, and the seventh isolating switch 7G to form a fourth interval. the first intervals are on the same longitudinal axis;

A double-layer longitudinal jump line II is set above the first compartment and the fourth compartment. The double-layer longitudinal span line II is parallel to the longitudinal span line I, and the upper layer line of the double-layer longitudinal span line II is sequentially connected to the outlet arrester of this power supply compartment. MOA, the seventh isolating switch 7G, the third current transformer 3CT, the third circuit breaker 3CB, and the fifth isolating switch 5G are then connected to the lower line of the double-layer vertical spanning line II, and the lower line is connected to the lower crossing line. Such arrangement and wiring can ensure that 2 main transformers and 2 power supplies will not be lost under various possible accidents and maintenance states.

When the double circuit breaker described in the present invention is used as a high-voltage power distribution device for single busbar segmentation and is applied to the renovation of an old project, the steps are as follows:

The old project has 4 to 5 circuits of incoming and outgoing lines, and 3 main transformers. The air-insulated power distribution device that has been put into operation is used for the single-bus section wiring, and it is transformed into double circuit breakers for single-bus section high-voltage power distribution. When installing;

Change the position of the single circuit breaker section interval originally located between the first section bus IM and the second section bus IIM to the subsection described in the technical plan for arranging double circuit breakers as a single bus section high-voltage power distribution device section circuit; specifically: the first isolating switch 1GF, the first circuit breaker 1CBF, the first current transformer 1CTF and the third isolating switch 3GF, as well as the isolating switch 2GB, the second isolating switch 2GF, and the second circuit breaker of the intermediate node 2CBF, the second current transformer 2CTF, the fourth isolating switch 4GF and the connections among them are transformed into integral SF6 gas-insulated combined equipment;

The above-mentioned integral SF6 gas-insulated composite equipment as a section circuit is located between the first section bus IM and the second section bus IIM.

In this way, the air-insulated power distribution device that has been put into operation is transformed into a scheme in which double circuit breakers are connected to the main transformer through an isolating switch in the middle of the section. SF6 gas insulated composite equipment is used instead of segmented and spaced equipment without changing the civil structure that has been built at one time. The construction is convenient and the cost is low, which can truly and effectively ensure the reliability and stability of the power supply of the power distribution device.

To sum up, the present invention firstly provides a high-voltage power distribution device with double circuit breakers as a single busbar section, which breaks through the existing design regulations and creatively proposes a sectioned circuit with main transformer and power supply line , using a structure with symmetrical distribution of circuits, so that the power supply of the power supply and the number of circuits can be effectively coordinated; the segmented circuit is used as an adjustable power supply circuit in the middle, which can ensure that there are two circuits of power supply under various possible accidents and maintenance states ( The main transformer) incoming line provides effective power supply to the load of the substation, which truly and effectively guarantees the reliability and stability of the power supply of the power distribution device.

Description of drawings

Fig. 1 is a 110kV double circuit breaker segment and main transformer incoming electrical wiring diagram in the high-voltage power distribution device in which the double circuit breaker is used as a single busbar segment according to the present invention.

Figure 2 shows the layout of the 110kV power distribution device corresponding to the electrical wiring diagram in Figure 1; that is, the layout of the high-voltage power distribution device of the present invention when it is applied to a new project.

Fig. 3 shows the I-I sectional view in Fig. 2.

Figure 4 shows the wiring diagram of the 110kV double circuit breaker section and main transformer and power incoming line when there are 3 power lines in the 5-circuit line;

Figure 5 shows the layout of the 110kV power distribution device corresponding to the electrical wiring diagram in Figure 4;

Fig. 6 shows the II-II sectional view in Fig. 5 .

Fig. 7 shows the plane layout diagram of the 110kV power distribution device when the high-voltage power distribution device of the present invention is used to transform the old project of the 110kV double-row arrangement power distribution device;

Fig. 8 shows the plane layout diagram of the 110kV power distribution device when the high-voltage power distribution device of the present invention is used to transform the old project of the 110kV single row distribution device;

Fig. 9 is a cross-sectional view of segmental and main transformer incoming line intervals when the high-voltage power distribution device of the present invention is used to transform an old project.

Figure 10 shows the electrical wiring diagram of the 110kV power distribution device with the 4-circuit design according to the existing regulations as described in the background technology;

Fig. 11 shows the electrical wiring diagram of the 110kV power distribution device with 5 loops designed according to the existing regulations as described in the background technology.

detailed description

Example 1:

Referring to attached drawing 1, first provide the technical scheme of the high-voltage power distribution device with 4 circuit lines and 3 transformers: the high-voltage power distribution device with double circuit breakers as a single busbar segment includes: the first segmental bus IM, the second segmental bus IIM and segment circuits. Each segmental bus is connected with 2 return lines (incoming line and outgoing line) and 1 main transformer, and the main transformers connected to the first segmental bus IM and the second segmental bus IIM are respectively #1 main transformer and # 3 main transformers, and at least one of the two loops on each segment bus is a power line.

The section circuit includes a first circuit breaker 1CBF, a second circuit breaker 2CBF and an intermediate node; one end of the first circuit breaker 1CBF is connected to the first section bus IM through the first isolating switch 1GF, and the other end is connected through the first current transformer 1CTF and the third isolating switch 3GF are connected to the intermediate node; similarly, one end of the second circuit breaker 2CBF is connected to the second section bus IIM through the second isolating switch 2GF, and the other end is connected through the second current transformer 2CTF and the fourth The isolation switch 4GF is connected to the intermediate node; and the intermediate node is connected to the #2 main transformer through the isolation switch 2GB.

When the above-mentioned high-voltage power distribution device with 4 circuits and 3 transformers is applied to a new project, refer to accompanying drawings 2 and 3. In Figure 2, the left side is the equipment name sequence distributed vertically in the power distribution device. The application steps are as follows:

In the column of the bus section, the first isolating switch 1GF, the first circuit breaker 1CBF, the first current transformer 1CTF and the third isolating switch 3GF are arranged longitudinally from south to north in order to form the first interval, and the second The second isolating switch 2GF, the second circuit breaker 2CBF, the second current transformer 2CTF, and the fourth isolating switch 4GF are arranged longitudinally from south to north in order to form the second compartment. The first compartment is parallel to the second compartment and is located in the substation. Between the first section busbar IM and the second section busbar IIM; the isolating switch 2GB of the intermediate node occupies the third bay, which is on the same longitudinal axis as the second bay, in the south direction of the second bay;

In this scheme, the subsection circuit formed by the double circuit breaker section and the main transformer incoming line isolation switch 2GB occupies three compartments, among which the first compartment occupied by 1GF, 1CBF, 1CTF and 3GF, and the first compartment occupied by 2GF, 2CBF, 2CTF and The second compartment occupied by 4GF is distributed in parallel and parallel, and is located in the north direction of the power distribution device;

Focusing on attached drawing 2, and referring to attached drawing 3, a crossing line K is constructed to connect with 3GF and 4GF through a framework above the third isolating switch 3GF and the fourth isolating switch 4GF with two intervals in the north direction, that is to say, the horizontal line Crossing line K is located above the first compartment and the second compartment, and straddles the two compartments, and is located in the north direction of the two compartments;

Then erect a longitudinal spanning line I that spans the spanning line K and the segmented busbar IIM from above through the frame, and the longitudinal spanning line I is connected with the spanning line K above the spanning line K, and then vertically spans the second interval and The third compartment is finally connected to the #2 main transformer via the isolating switch 2GB.

The parts not described in the present invention are the same as the prior art.

Example 2:

Referring to accompanying drawing 4, when the 110kV lines in the substation are 5 circuits, 3 of which are power lines, the configuration is roughly the same as that of embodiment 1, except that a power line is drawn out at the middle node. Specifically: the intermediate node is divided into intermediate node 1 and intermediate node 2, the intermediate node 1 is connected to #2 main transformer through the isolating switch 2GB; the intermediate node 2 is connected to a power line, through the fifth isolating switch 5G ), the third circuit breaker 3CB, the third current transformer 3CT and the seventh isolating switch 7G (outgoing line isolating switch) to form #5 line. Therefore, when the IM or IIM fails or is disconnected for maintenance, the third power supply line (i.e. #5 line) in the section circuit can supply power to the unfaulted section busbar and the main transformer on the section circuit , improving the stability and reliability of power supply.

Referring to accompanying drawing 5 and accompanying drawing 6, the 110kV line shown is 5 times, among them 3 times are power line when the high-voltage power distribution device is applied to the new construction, the different part of embodiment 1 lies in the application described in embodiment 1 Basically, in the south direction of the same longitudinal axis as the first compartment, a fourth compartment is arranged parallel to the third compartment. In the fourth compartment, the fifth isolating switch 5G, the fourth compartment are distributed from north to south in sequence. Three circuit breakers 3CB, a third current transformer 3CT, and a seventh isolating switch 7G.

As shown in Figure 6, the arrangement of the technical solution described in this embodiment is based on Embodiment 1, and a double-layer longitudinal span line II is arranged above the first compartment and the fourth compartment, and the double-layer longitudinal span line II It is parallel to the vertical spanning line I located above the second compartment and the third compartment, so one of the power lines can be sequentially connected to the outgoing line of this power supply compartment through the upper line of the double-layer longitudinal spanning line II parallel to the longitudinal spanning line I Lightning arrester MOA, outgoing line isolating switch 7G, third current transformer 3CT, third circuit breaker 3CB, incoming line isolating switch 5G, and then connected to the lower line of the double-layer longitudinal spanning line II, which is connected to the lower horizontal line K , Such arrangement and wiring can ensure that 2 main transformers and 2 power supplies will not be lost under various possible accidents and maintenance states.

The parts not described in this embodiment are the same as those in Embodiment 1.

Example 3:

According to Embodiment 1 of the present invention, the high-voltage power distribution device with double circuit breakers as single busbar section is applied to the renovation of old projects. That is to say, in the existing projects that have been put into operation, the high-voltage power distribution device of the single-bus section is transformed. Referring to accompanying drawing 9, firstly, the first isolating switch 1GF, the first circuit breaker 1CBF, the first current The transformer 1CTF and the third isolating switch 3GF, as well as the intermediate node isolating switch 2GB, the second isolating switch 2GF, the second circuit breaker 2CBF, the second current transformer 2CTF, the fourth isolating switch 4GF and other equipment; then they are composed The integral SF6 gas-insulated combined equipment has a compact structure and can be placed in the interval where the single circuit breaker section was originally installed, without changing the original civil structure, and the construction is more convenient.

Referring to attached drawings 7 and 8, when renovating old projects, the air-insulated segmented equipment that has been put into operation is replaced with SF6 gas-insulated combined equipment, which can be used for power distribution in double-row arrangement of circuit breakers The device, as shown in Figure 7, can also be used for a power distribution device with circuit breakers arranged in a single row, as shown in Figure 8.

For the parts not described in this embodiment, refer to Embodiment 1 and Embodiment 2.

Claims (4)

1. dual-breaker makees the high voltage distribution installation of sectionalized single busbar connection, includes the first sectionalized busbar（IM）With the second sectionalized busbar （IIM）, every sectionalized busbar is connected to 2 loop lines and 1 main transformer, is connected to the first sectionalized busbar（IM）Female with the second segmentation Line（IIM）Main transformer be respectively at least 1 telegram in reply source on #1 main transformer and #3 main transformer, and each sectionalized busbar Line；It is characterized in that：Also include segmentation loop, it includes the first chopper（1CBF）, the second chopper（2CBF）And in Intermediate node；First chopper（1CBF）One end pass through the first disconnecting switch（1GF）With the first sectionalized busbar（IM）Connect, another The first current transformer is then passed through at end（1CTF）With the 3rd disconnecting switch（3GF）It is connected with intermediate node；Likewise, the second open circuit Device（2CBF）One end pass through the second disconnecting switch（2GF）With the second sectionalized busbar（IIM）Connect, the other end then passes through the second electricity Current transformer（2CTF）With the 4th disconnecting switch（4GF）It is connected with intermediate node；

When the 110kV outlet in transformer station be 5 times, wherein 3 times be power line when, intermediate node is divided into intermediate node 1 and centre Node 2, intermediate node 1 passes through disconnecting switch（2GB）It is connected to #2 main transformer；Intermediate node 2 then connects a power line, warp By the 5th disconnecting switch（5G）, the 3rd chopper（3CB）, the 3rd current transformer（3CT）And the 7th disconnecting switch（7G）Draw Go out.

2. dual-breaker make the application on new construction of the high voltage distribution installation of sectionalized single busbar connection it is characterised in that include as Lower step：The high voltage distribution installation providing a kind of outlet to be 4 times, twice power lines, includes the first sectionalized busbar（IM）With Two-section bus（IIM）, every sectionalized busbar is connected to 2 loop lines and 1 main transformer, is connected to the first sectionalized busbar（IM）With Second sectionalized busbar（IIM）Main transformer be respectively on #1 main transformer and #3 main transformer, and each sectionalized busbar at least There is 1 time power line；Also include segmentation loop, it includes the first chopper（1CBF）, the second chopper（2CBF）And it is middle Node；First chopper（1CBF）One end pass through the first disconnecting switch（1GF）With the first sectionalized busbar（IM）Connect, the other end Then pass through the first current transformer（1CTF）With the 3rd disconnecting switch（3GF）It is connected with intermediate node；Likewise, the second chopper （2CBF）One end pass through the second disconnecting switch（2GF）With the second sectionalized busbar（IIM）Connect, the other end then passes through the second electric current Transformer（2CTF）With the 4th disconnecting switch（4GF）It is connected with intermediate node, intermediate node then passes through disconnecting switch（2GB）Connect To #2 main transformer；

With the first disconnecting switch（1GF）, the first chopper（1CBF）, the first current transformer（1CTF）And the 3rd disconnecting switch （3GF）Sequentially longitudinal arrangement, composition first interval, and the second disconnecting switch（2GF）, the second chopper（2CBF）, the second electric current Transformer（2CTF）, the 4th disconnecting switch（4GF）Sequentially longitudinal arrangement, composition second interval, the first interval and the second interval are flat Row side by side, and is located at the first sectionalized busbar in transformer station（IM）With the second sectionalized busbar（IIM）Between；Disconnecting switch（2GB）Account for With the 3rd interval, the 3rd interval is on same longitudinal axis with the second interval；

Above-mentioned dual-breaker segmentation and the disconnecting switch connecting #2 main transformer（2GB）Take three intervals, the 3rd disconnecting switch （3GF）With the 4th disconnecting switch（4GF）Overhead sets up one article of cross span and the 3rd disconnecting switch by framework（3GF）With the 4th every Leave pass（4GF）Connect,

Set up one through framework again and cross over this cross span and the second sectionalized busbar from top（IIM）Vertical cross-line（I）, this vertical across Line（I）Be connected with cross span above cross span, then longitudinal crossing second interval and the 3rd interval, after through disconnecting switch （2GB）It is followed by #2 main transformer.

3. dual-breaker makees the application on new construction of the high voltage distribution installation of sectionalized single busbar connection it is characterised in that providing such as 5 loop line roads described in claim 1, are for wherein 3 times the technical scheme of the high voltage distribution installation of power line, and its application process includes Have the following steps：

With the first disconnecting switch（1GF）, the first chopper（1CBF）, the first current transformer（1CTF）And the 3rd disconnecting switch （3GF）Sequentially longitudinal arrangement, composition first interval, and the second disconnecting switch（2GF）, the second chopper（2CBF）, the second electric current Transformer（2CTF）, the 4th disconnecting switch（4GF）Sequentially longitudinal arrangement, composition second interval, the first interval and the second interval are flat Row side by side, and is located at the first sectionalized busbar in transformer station（IM）With the second sectionalized busbar（IIM）Between；Disconnecting switch（2GB）Account for With the 3rd interval, the 3rd interval is on same longitudinal axis with the second interval；

Above-mentioned dual-breaker segmentation and the disconnecting switch connecting #2 main transformer（2GB）Take three intervals, the 3rd disconnecting switch （3GF）With the 4th disconnecting switch（4GF）Overhead sets up one article of cross span and the 3rd disconnecting switch by framework（3GF）With the 4th every Leave pass（4GF）Connect,

Set up one through framework again and cross over this cross span and the second sectionalized busbar from top（IIM）Vertical cross-line（I）, this vertical across Line（I）Be connected with cross span above cross span, then longitudinal crossing second interval and the 3rd interval, after through disconnecting switch （2GB）It is followed by #2 main transformer；

The power line in segmentation loop will be accessed, by the 5th disconnecting switch（5G）, the 3rd chopper（3CB）, the 3rd current transformer （3CT）, the 7th disconnecting switch（7G）Sequentially longitudinal arrangement, composition the 4th interval, the 4th interval and the first interval are in same On longitudinal axis；

The double-deck vertical cross-line of setting above the first interval and the 4th interval（II）, this bilayer indulges cross-line（II）With vertical cross-line（I）Flat OK, by double-deck vertical cross-line（II）Upper layer line be sequentially ingressed into this 4th interval outlet spark gap（MOA）, the 7th disconnecting switch （7G）, the 3rd current transformer（3CT）, the 3rd chopper（3CB）, the 5th disconnecting switch（5G）Afterwards, then be connected to double-deck vertical cross-line （II）Lower layer line, double-deck vertical cross-line（II）Lower layer line be connected with lower section cross span.

4. dual-breaker make the high voltage distribution installation of sectionalized single busbar connection in the application transforming old engineering it is characterised in that include as Lower step：

The high voltage distribution installation providing a kind of outlet to be 4 times, twice power lines, includes the first sectionalized busbar（IM）With second point Section bus（IIM）, every sectionalized busbar is connected to 2 loop lines and 1 main transformer, is connected to the first sectionalized busbar（IM）With second Sectionalized busbar（IIM）Main transformer be respectively at least 1 time on #1 main transformer and #3 main transformer, and each sectionalized busbar Power line；Also include segmentation loop, it includes the first chopper（1CBF）, the second chopper（2CBF）And intermediate node； First chopper（1CBF）One end pass through the first disconnecting switch（1GF）With the first sectionalized busbar（IM）Connect, the other end then leads to Cross the first current transformer（1CTF）With the 3rd disconnecting switch（3GF）It is connected with intermediate node；Likewise, the second chopper （2CBF）One end pass through the second disconnecting switch（2GF）With the second sectionalized busbar（IIM）Connect, the other end then passes through the second electric current Transformer（2CTF）With the 4th disconnecting switch（4GF）It is connected with intermediate node, intermediate node then passes through disconnecting switch（2GB）Connect To #2 main transformer；

Old engineering is line 4～5 times, main transformer is 3, has been put into operation using air-insulated by single-trunk segmental wiring Power distribution equipment, when being transformed into the high voltage distribution installation that dual-breaker makees sectionalized single busbar connection；

The first sectionalized busbar will be originally located at（IM）With the second sectionalized busbar（IIM）Between single breaker section gap position change Segmentation loop described in the technical scheme of the high voltage distribution installation making sectionalized single busbar connection for arrangement dual-breaker；It is specially：Will First disconnecting switch（1GF）, the first chopper（1CBF）, the first current transformer（1CTF）With the 3rd disconnecting switch（3GF）, with And the disconnecting switch of intermediate node（2GB）, the second disconnecting switch（2GF）, the second chopper（2CBF）, the second current transformer （2CTF）, the 4th disconnecting switch（4GF）And its between connection all transform monoblock type SF6 gas-insulated unit equipment as；

The above-mentioned monoblock type SF6 gas-insulated unit equipment as segmentation loop is located at the first sectionalized busbar（IM）With the second segmentation Bus（IIM）Between.