CN203895766U - Double busbar and double subsection based substation main wiring system - Google Patents

Abstract

The utility model relates to a double busbar and double subsection based 220kV substation main wiring system, which comprises a first GIS busbar and a second GIS busbar, wherein each of the first GIS busbar and the second GIS busbar is formed by two busbar sections. The double busbar and double subsection based substation main wiring system is characterized in that a first GIS front busbar and a second GIS front busbar are connected to a power plant A through a first outgoing circuit breaker and connected to a power plant B through a second outgoing circuit breaker; and a first GIS rear busbar and a second GIS rear busbar are connected to the power plant A through a third outgoing circuit breaker and connected to the power plant B through a fourth outgoing circuit breaker. The double busbar and double subsection based substation main wiring system adjusts spaced arrangement of the power plants and the substation through increasing busbar cylinders which are arranged in the substation in a crossed mode, and avoids a condition that the overall electric power transmission channel of main wiring of conventional double busbar subsection wiring is cut off when the sectionalized side busbar stops operating, thereby greatly improving the power supply reliability; and only a small section of busbar equipment is required to be additionally arranged through increasing the busbar cylinders which are arranged in the substation in the crossed mode, thereby being small in investment, and avoiding increasement in construction difficulty and cost brought about by the line reverse interval.

Description

Substation main wiring system based on double busbar and double section

technical field

The utility model relates to the technical field of power system substations, in particular to a main wiring system of a 220kV substation based on double busbars and double sections.

Background technique

A substation is a power device in a power system that transforms voltage, receives and distributes electric energy, controls the flow of power, and adjusts voltage. It connects the power grids of all levels of voltage through its transformers. Substations can be divided into: 1000kV, 750kV, 500kV, 330kV, 220kV, 110kV, 66kV, 35kV, 10kV, 6.3kV and other voltage levels.

At present, the main wiring type of 220kV substation generally adopts double busbar segmental wiring or double busbar wiring (with segmental switch). Because GIS (gas-insulated metal-enclosed switchgear) high-voltage combined electrical equipment has the advantages of small footprint and reliable operation, 220kV power distribution devices in 220kV substations generally use GIS equipment. For substations with double-bus double-section wiring or double-bus knife-gate wiring, if a section of the bus fails, the bus on the same side of the switch needs to be shut down during the maintenance of the GIS equipment. Therefore, the design of the access system for this substation In the process, it is of great significance to fully consider the reasonable selection of the main wiring type to improve the safety and reliability of the system, improve the power supply capacity and the flexibility of operation.

In the design of the main wiring system of the new 220kV substation, the full use of the main wiring type and layout of the substation is often less considered, especially for the injection type connection of the power plant to the substation or the disconnection of the power plant grid-connected double-circuit line connection of the new substation. For the topological structure where the power plant is injected into the above-mentioned substation with double-circuit lines, if the incoming lines of the power plant are all located on the side of the substation switch, in the event of a failure of a bus in the substation, all the buses on the same side need to be cut off for maintenance. At that time, all power plants will be cut off, which will have a great impact on the safe power supply of power plants and power grids. For the case where the power plant has been connected to the power grid, and the newly-built substation disconnects the power plant’s outgoing line, if all the incoming lines of the power plant are located on the side of the substation section switch, when a bus failure occurs in the substation, the double-circuit lines from the substation to the power plant will all stop. Transport, resulting in the loss of the entire power transmission channel, will inevitably increase the flow of other outgoing lines of the power plant, affecting the power supply security of the power grid.

As shown in Figure 1, the following is an example of the case where a new substation disconnects the grid-connected double-circuit line of the power plant. entry situation. In this case, if the double-circuit line coming from power plant A is connected to one side of the bus section of the newly-built substation, in the event of maintenance or failure on the same side of the substation, the double-circuit outgoing line of the power plant cannot transmit power, and the power supply capacity of the power grid and power supply Reliability will be greatly affected. Due to the use of GIS equipment, the failure of any section of the busbars I, II, III, and IV of the newly-built substation will cause a power outage on the busbar on the same side for maintenance, resulting in the cut-off of the transmission channel from power plant A to substation B. Power supply reliability has a greater impact.

Utility model content

In view of the above shortcomings, the utility model provides a 220kV substation main wiring system based on double busbars and double sections, which can improve the power supply capacity and reliability of the power system.

The technical solution adopted by the utility model to solve the technical problem is: the main wiring system of the 220kV substation based on double busbars and double sections. The first GIS busbar and the second GIS busbar constituted, are characterized in that the first GIS busbar includes the first GIS front busbar and the first GIS rear busbar connected by the first section circuit breaker, and the second GIS busbar It includes the second GIS front busbar and the second GIS rear busbar connected by the second section circuit breaker; the first GIS front busbar and the second GIS front busbar are connected with two 220kV main transformers, and are connected through the first outlet circuit breaker It is connected to power plant A and connected to substation B through the second outlet circuit breaker; the first GIS rear busbar and the second GIS rear busbar are connected to two 220kV main transformers, and are connected to power plant A through the third outlet circuit breaker, through The fourth outlet circuit breaker is connected to substation B; the first GIS front busbar and the second GIS front busbar are connected through the first bus tie circuit breaker, and the first GIS rear busbar and the second GIS rear busbar are connected through the second bus tie circuit breaker connected.

Further, the two ends of the first section circuit breaker and the second section circuit breaker are respectively provided with section isolation switches; the first outgoing line circuit breaker, the second outgoing line circuit breaker, the third outgoing line circuit breaker and the The two ends of the four-outlet circuit breaker are respectively provided with outlet isolating switches.

Further, bus-tie isolating switches are respectively provided at both ends of the first bus-tie circuit breaker and the second bus-tie circuit breaker.

Further, at the intersection of the outgoing line from the second outgoing line circuit breaker to substation B and the outgoing line from the third outgoing line circuit breaker to power plant A, a first bus barrel is arranged between the second outgoing line circuit breaker and substation B, and the first A second busbar barrel is arranged between the three-outlet circuit breaker and the power plant A, and the first busbar barrel and the second busbar barrel are intersected.

The beneficial effects of the utility model are:

1) The utility model adjusts the interval arrangement of power plants and substations by increasing the cross-set bus barrels in the station, and avoids the situation that the entire power sending channel is cut off when the main wiring of the conventional double-bus section wiring is out of service on the side of the section. , greatly improving the reliability of power supply.

2) The utility model only needs to add a small section of busbar equipment by increasing the busbar barrels arranged crosswise in the station, and the investment is small, which avoids the construction difficulty and cost increase caused by the inversion of the line outside the station.

Description of drawings

Fig. 1 is the structural schematic diagram of the 220kV substation main wiring system based on double busbar double section in the prior art;

Fig. 2 is the structural representation of the utility model;

In the figure, 11, the first GIS front busbar, 12, the first GIS rear busbar, 21, the second GIS front busbar, 22, the second GIS rear busbar, 31, the first section circuit breaker, 32, the second section Circuit breaker, 41, first outlet circuit breaker, 42, second outlet circuit breaker, 43, third outlet circuit breaker, 44, fourth outlet circuit breaker, 51, first bus tie circuit breaker, 52 second bus tie breaker Device, 61, the first bus barrel, 62 the second bus barrel.

Detailed ways

In order to clearly illustrate the technical features of this solution, the utility model will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for realizing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. It should be noted that components illustrated in the figures are not necessarily drawn to scale. The present invention omits descriptions of known components and processing techniques and processes to avoid unnecessarily limiting the present invention.

As shown in Figure 2, a 220kV substation main wiring system based on double busbars and double sections of the utility model, the 220kV substation is set between the power plant A and the substation B connected to the power grid, including two sections of busbars The first GIS busbar and the second GIS busbar are characterized in that the first GIS busbar includes the first GIS front busbar 11 and the first GIS rear busbar 12 connected by the first section circuit breaker 31, and the second GIS busbar The GIS busbar includes the second GIS front busbar 21 and the second GIS rear busbar 22 connected by the second section circuit breaker 32; the first GIS front busbar 11 and the second GIS front busbar 21 are connected with two 220kV main transformers ( 1# main transformer and 2# main transformer), and connected to power plant A through the first outlet circuit breaker 41, and connected to substation B through the second outlet circuit breaker 42; the first GIS rear busbar 12 and the second GIS rear busbar 12 is connected with two 220kV main transformers (3# main transformer and 4# main transformer), and is connected to power plant A through the third outlet circuit breaker 43, and connected to substation B through the fourth outlet circuit breaker 44; the first GIS The front bus 11 and the second GIS front bus 21 are connected through the first bus-tie circuit breaker 51 , and the first GIS rear bus 12 and the second GIS rear bus 22 are connected through the second bus-tie circuit breaker 52 . At the intersection of the outgoing line from the second outgoing line circuit breaker 42 to the substation B and the outgoing line from the third outgoing line circuit breaker 43 to the power plant A, a first bus barrel 61 is arranged between the second outgoing line circuit breaker 42 and the substation B, the A second busbar barrel 62 is arranged between the third outlet circuit breaker 43 and the power plant A, and the first busbar barrel 61 and the second busbar barrel 62 are intersected.

Further, the two ends of the first section circuit breaker 31 and the second section circuit breaker 32 are respectively provided with section isolation switches; the first outgoing line circuit breaker 41, the second outgoing line circuit breaker 42, the third outgoing line circuit breaker Both ends of the circuit breaker 43 and the fourth outgoing line circuit breaker 44 are respectively provided with outgoing line isolating switches, and both ends of the first bus tie circuit breaker 51 and the second bus tie circuit breaker 52 are respectively provided with bus tie isolating switches.

On the basis of the layout of the main wiring of the conventional 220kV substation, the utility model selects the two closest intervals, and increases part of the busbar barrel equipment to extend to the interval position where the outgoing line is to be. To the outlet position to be adjusted, the extended busbars must be crossed, which can be realized by parallel arrangement up and down. After extending to the outlet position to be adjusted, it is connected to the outlet terminal tower through the wall bushing or directly to avoid passing the line The construction difficulty and safety hazards brought about by adjusting the interval.

The utility model is an improved main wiring layout type based on double-bus double-section wiring. On the basis of conventional double-bus double-section wiring, by adding bus barrels arranged crosswise in the station, the original power plant A outlet line is located in the bus section. The optimization and adjustment on the same side is that the outgoing line of the power plant and the outgoing line of the substation B are located on the same side, so as to ensure that in the case of a bus failure on one side of the 220KV substation, the power transmission channel between the power plant A and the substation B on the other side of the section can be unblocked, avoiding the conventional When the main wiring of double-bus section wiring is out of service on one side of the section, the entire power transmission channel is cut off, which greatly improves the reliability of power supply.

The above is only a preferred embodiment of the utility model, and for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, and these improvements and modifications are also regarded as It is the protection scope of the utility model.

Claims (4)

1. The main wiring system of the 220kV substation based on double busbars and double sections. The 220kV substation is set between the power plant A and the substation B connected to the power grid, including the first GIS busbar and the second GIS busbar composed of two sections of busbars , characterized in that, the first GIS busbar includes a first GIS front busbar and a first GIS rear busbar connected by a first section circuit breaker, and the second GIS busbar includes a first GIS busbar connected by a second section circuit breaker. Two GIS front busbars and the second GIS rear busbar; the first GIS front busbar and the second GIS front busbar are connected with two 220kV main transformers, and are connected to power plant A through the first outlet circuit breaker, and through the second outlet circuit breaker It is connected to substation B; the first GIS rear busbar and the second GIS rear busbar are connected with two 220kV main transformers, and are connected to power plant A through the third outlet circuit breaker, and connected to substation B through the fourth outlet circuit breaker; The first GIS front bus bar and the second GIS front bus bar are connected through a first bus tie circuit breaker, and the first GIS rear bus bar and the second GIS rear bus bar are connected through a second bus tie circuit breaker. 2. The 220kV substation main wiring system based on double busbars and double sections according to claim 1, wherein the two ends of the first section circuit breaker and the second section circuit breaker are respectively provided with section isolation Switches; two ends of the first outgoing line circuit breaker, the second outgoing line circuit breaker, the third outgoing line circuit breaker and the fourth outgoing line circuit breaker are respectively provided with outgoing line isolating switches. 3. The 220kV substation main wiring system based on double bus bars and double sections according to claim 1, wherein the two ends of the first bus tie circuit breaker and the second bus tie circuit breaker are respectively provided with bus tie isolation switch. 4. The 220kV substation main wiring system based on double busbars and double sections according to any one of claims 1 to 3, characterized in that, the second outlet circuit breaker to the outlet of substation B and the third outlet circuit breaker to the power plant At the intersection of outgoing lines of A, a first busbar barrel is set between the second outgoing line circuit breaker and substation B, a second busbar barrel is set between the third outgoing line circuit breaker and power plant A, and the first busbar barrel Set crosswise with the second busbar barrel.