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

Abstract

The invention relates to a high-voltage distribution device, in particular to a high-voltage distribution device with double breakers used for single bus segmentation and the application of the high-voltage distribution device. According to the high-voltage distribution device with the double breakers used for single bus segmentation, a segmented circuit with main transformers and power source incoming lines is provided creatively. The high-voltage distribution device comprises the first breaker 1CBF, the second breaker 2CBF and an intermediate node. The two breakers are connected to two sectioned buses. The intermediate node is connected to the second main transformer through a disconnecting switch 2GB. The high-voltage distribution device can be applied to a newly constructed project and an old project which is put into operation through transformation. The high-voltage distribution device with the double breakers used for single bus segmentation has the advantages that the structural form that loops are symmetrically distributed is adopted, and therefore power supply of a power source and the number of the loops can be effectively matched with each other; it can be guaranteed that under the condition of various possible accidents and the overhauling state, the two loops of power source (main transformers) incoming lines effectively supply power to the load of a power substation, and the reliability and the stability of power supply of a power distribution device are definitely and effectively guaranteed.

Description

technical field

[0001] 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

[0002] 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 (o...

Examples

Embodiment 1

[0038] Refer to attached figure 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 single busbar segmentation includes: the first segmental bus IM, the second segmental bus IIM and segmental 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.

[0039] 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 fir...

Embodiment 2

[0047] Refer to attached Figure 4 , when the 110kV lines in the substation are 5 circuits, of which 3 circuits are power lines, the configuration method is roughly the same as that of embodiment 1, except that a power line is drawn out at the intermediate 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 supp...

Embodiment 3

[0052] 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. Refer to attached Figure 9 , firstly, the equipment of the segmented circuit corresponds to the first isolating switch 1GF, the first circuit breaker 1CBF, the first current transformer 1CTF and The third isolating switch 3GF, and the isolating switch 2GB of the intermediate node, 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 of integral SF6 gas The insulation combination equipment has a compact structure and can be placed in the interval where the single circuit breaker section was origi...

technical field

[0001] 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

[0002] 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 (o...

Examples

Embodiment 1

[0038] Refer to attached figure 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 single busbar segmentation includes: the first segmental bus IM, the second segmental bus IIM and segmental 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.

[0039] 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 fir...

Embodiment 2

[0047] Refer to attached Figure 4 , when the 110kV lines in the substation are 5 circuits, of which 3 circuits are power lines, the configuration method is roughly the same as that of embodiment 1, except that a power line is drawn out at the intermediate 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 supp...

Embodiment 3

[0052] 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. Refer to attached Figure 9 , firstly, the equipment of the segmented circuit corresponds to the first isolating switch 1GF, the first circuit breaker 1CBF, the first current transformer 1CTF and The third isolating switch 3GF, and the isolating switch 2GB of the intermediate node, 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 of integral SF6 gas The insulation combination equipment has a compact structure and can be placed in the interval where the single circuit breaker section was origi...

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