CN203932698U - A kind of single busbar connection dual-breaker sectional wiring structure - Google Patents

Abstract

The utility model discloses a kind of single busbar connection dual-breaker sectional wiring structure.Used double bus scheme structure, complex structure, electric component is many, operates underaction, convenience when operation.The utility model comprises first paragraph bus, second segment bus, the first main transformer and the second main transformer, it is characterized in that, in the wire inlet loop access first paragraph bus of described the first main transformer, in the wire inlet loop access second segment bus of the second main transformer, on two sections of described buses, be respectively connected to multiple transmission line circuits; The wire inlet loop that is provided with the 3rd main transformer between two sections of described buses, the wire inlet loop of the 3rd main transformer comprises the 3rd main transformer, two circuit breakers and multiple isolating switch, the 3rd main transformer is connected across between two sections of buses by two circuit breakers.

Description

A segmented wiring structure with single busbar and double circuit breakers

technical field

The utility model relates to the field of power system wiring, in particular to a segmented wiring structure with single busbar and double circuit breakers.

Background technique

The substation is the main component of the power system and an important energy transmission point in the power transmission and distribution system. Its electrical main wiring is the main part of the power system wiring, and its structure directly affects the selection of equipment, distribution device layout, and relay protection. The configuration, selection of automatic devices and control methods, and the main wiring structure are closely related to the reliability, flexibility and economy of the power system as a whole and the operation of the substation itself. Therefore, in the substation design, it is very necessary to determine a reasonable main wiring structure .

The existing main wiring has the following types:

(1) Single busbar wiring. Single bus connection has the advantages of simple and clear wiring, less equipment, convenient operation, easy expansion and the use of complete power distribution devices, etc., but it is not flexible enough and reliable, and the entire power distribution device needs to be powered off when any component fails or is overhauled. Single-bus connection is mainly suitable for substations with small capacity and few lines.

(2) Segmented wiring of single busbar. After the bus is divided into sections with circuit breakers, two circuits can be drawn from different sections for important users, and there are two power supplies for power supply. When a section of the bus fails, the section circuit breaker will automatically cut off the failure to ensure the uninterrupted power supply of the normal section of the bus and not cause power outages for important users. Its disadvantage is that when a section of busbar or busbar isolating switch fails or is overhauled, the circuit of this section of busbar will be powered off during the overhaul period, and when the outgoing line is double-circuited, the outgoing line of the overhead line is often crossed, and it needs to be balanced in two directions during expansion. expansion.

(3) Double busbar wiring. The double busbar wiring is the electrical main wiring composed of the main transformer circuit, the line and two sets of busbars. It has the advantages of reliable power supply, flexible scheduling, convenient expansion, and convenient testing. Its disadvantages are mainly: more bus isolating switches are used, the length of the bus is longer, and the area occupied by the power distribution device is larger; when switching the bus, The bus isolating switch is frequently operated and misoperation is prone to occur; due to the existence of many electrical connection points between the two groups of bus bars, when the bus isolating switch in the opening position or the bus tie circuit breaker fails, the two groups of bus bars may be disconnected. That is, the power distribution device of the whole substation is out of service. When the power distribution devices of substations and power plants occupy an important position in the power grid, the power load is large, and there are many outgoing circuits, double busbar wiring is usually used. At present, when there are more than 4 outgoing circuits in 220kV substations in my country, double busbar wiring is often used.

(4) Sectional wiring of double busbars. Double busbar connection can be operated in sections, and the degree of freedom of the system configuration is large. The two components can be connected to different busbars separately, which is beneficial to systems with large capacity and need to be connected with each other. An extension of the traditional technology, so there will be no problems in the relay protection mode and operation, and it is easier to realize the advantages of phased expansion, but it is easily affected by the bus failure, and the circuit breaker must be shut down when the circuit breaker is overhauled. , occupying a larger area. At present, generally when the total number of connecting components such as lines and transformers is greater than or equal to 10 circuits, the busbar is single-sectioned, and when it is greater than or equal to 15 circuits, double-busbar double-section wiring is used.

Utility model content

The technical problem to be solved by the utility model is to overcome the above-mentioned defects in the prior art, and to provide a segmented wiring structure with single busbar and double circuit breakers, which is simple in type and flexible in operation There are fewer components than double-bus wiring.

For this reason, the technical scheme adopted by the utility model is as follows: a segmented wiring structure of single busbar and double circuit breaker, including the first section busbar, the second section busbar, the first main transformer and the second main transformer, characterized in that,

The incoming circuit of the first main transformer is connected to the first section of the bus, the incoming circuit of the second main transformer is connected to the second section of the bus, and each of the two sections of the bus is connected to a plurality of outgoing circuits;

The incoming line circuit of the third main transformer is arranged between the two sections of busbars, and the incoming line circuit of the third main transformer includes the third main transformer, two circuit breakers and a plurality of disconnectors, and the circuit breaker is located at Between the two isolating switches, two circuit breakers are connected in parallel and connected in series with the third main transformer. The two circuit breakers are respectively connected to the two bus sections, and the third main transformer is bridged between the two bus sections through the two circuit breakers.

The utility model adopts single busbar and double circuit breaker segmented wiring. When the segmented circuit breaker fails, the two busbars run separately for a short time, which can meet the requirements of power system decoupling operation, and the electrical components are less than double busbar wiring. The utility model can guarantee that any one section of the bus fails, and the substation has two main transformers for power supply, thereby improving the reliability of power supply.

As a further improvement and supplement to the above-mentioned technical solution, the utility model adopts the following technical measures:

The outgoing circuit includes a plurality of isolating switches connected in series and a circuit breaker, and the circuit breaker is located between the two isolating switches.

The incoming circuit of the first main transformer includes a first main transformer connected in series, a plurality of isolating switches and a circuit breaker, and the circuit breaker is located between the two isolating switches.

The incoming circuit of the second main transformer includes a second main transformer connected in series, a plurality of isolating switches and a circuit breaker, and the circuit breaker is located between the two isolating switches.

The circuit breaker is an isolated circuit breaker. Compared with the traditional AIS (Air Insulated Switchgear) substation, the isolated circuit breaker (DCB) equipment combines circuit breakers, grounding switches, voltage transformers, current transformers and other equipment into a whole through optimized design. DCB The advantages of the equipment are small footprint, high reliability, strong safety, small maintenance workload, and the maintenance interval of its main components is not less than 20 years.

The first section of the busbar and the second section of the busbar are both GIL busbars. When the bus bar of the utility model fails, part of the lines will be cut off. Therefore, the busbar of the utility model is preferably GIL busbar, which seals the busbar in the insulating pipeline. The highly integrated design and exquisite manufacturing process of the GIL busbar have greatly improved the reliability. It can achieve 20 years of maintenance-free, and the bus failure probability is greatly increased decrease.

Compared with the double-busbar wiring structure, the utility model has the following beneficial effects: the type is simple, the number of equipment is the same as that of the single-female three-section wiring, which is less than that of the double-busbar, the wiring is clear, it is not easy to cause misoperation, and the artificiality is reduced. Failure probability; in the case of any component failure, the utility model will not cause a power outage in the whole station, and because there is no bus tie switch, the failure mode is less than that of the double bus, which has a positive contribution to the failure frequency index; the utility model The new-type incoming and outgoing lines are fixedly connected to one busbar. After the power flow calculation, the interval between the incoming and outgoing lines is reasonably allocated, so that the power line and the load line are paired and connected to the same busbar, and the circuits with the same name are distributed on different busbars, which can also meet the parallel operation of the system. And separate operation requirements, and there is no switching operation, the operation is simpler and the safety is high.

Description of drawings

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

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments of the specification.

As shown in Figure 1, the single busbar double circuit breaker segmented wiring structure, the incoming line circuit of the first main transformer 1 is connected to the first section of busbar 4, and the incoming line circuit of the second main transformer 2 is connected to the second section of busbar 5 In the above, the first busbar 4 is connected with outgoing loops L1, L2 and L3, and the second busbar 5 is connected with outgoing loops L4, L5 and L6.

The incoming circuit of the third main transformer 3 is provided between the two sections of busbars 4 and 5, and the incoming circuit of the third main transformer 3 includes the third main transformer 3, two circuit breakers E8, E9 and three Isolating switches S15, S16 and S17, the circuit breaker E8 is located between the two isolating switches S15 and S17, the circuit breaker E9 is located between the two isolating switches S16 and S17, the two circuit breakers E8 and E9 are connected in parallel and then connected to the isolating switch S17 It is connected in series with the third main transformer 3, and the two circuit breakers E8 and E9 are respectively connected to the two busbars 4 and 5, and the third main transformer 3 is bridged between the two busbars 4 and 5 through the two circuit breakers E8 and E9 .

The outgoing circuit L1 is composed of two isolating switches S1, S2 connected in series and a circuit breaker E1, and the circuit breaker E1 is located between the two isolating switches S1, S2. The outgoing circuit L2 is composed of two isolating switches S3, S4 connected in series and a circuit breaker E2, and the circuit breaker E2 is located between the two isolating switches S3, S4. The outgoing circuit L3 is composed of two isolating switches S5, S6 connected in series and a circuit breaker E3, and the circuit breaker E3 is located between the two isolating switches S5, S6. The outgoing circuit L4 is composed of two isolating switches S7, S8 connected in series and a circuit breaker E4, and the circuit breaker E4 is located between the two isolating switches S7, S8. The outgoing circuit L5 is composed of two isolating switches S9, S10 connected in series and a circuit breaker E5, and the circuit breaker E5 is located between the two isolating switches S9, S10. The outgoing circuit L6 is composed of two isolating switches S11, S12 connected in series and a circuit breaker E6, and the circuit breaker E6 is located between the two isolating switches S11, S12.

The circuit breakers used in the utility model are all isolated circuit breakers. The first section of busbar 4 and the second section of busbar 5 are both GIL busbars.

The above is only a description of the preferred embodiments of the present utility model, but should not be construed as a limitation on the claims. The utility model is not limited to the above embodiments, and its specific structure allows changes. All the various changes made within the scope of protection of the independent claims of the utility model are within the scope of protection of the utility model.

Claims (6)

1. a single busbar connection dual-breaker sectional wiring structure, comprises first paragraph bus, second segment bus, the first main transformer and the second main transformer, it is characterized in that,

In the wire inlet loop access first paragraph bus of described the first main transformer, in the wire inlet loop access second segment bus of the second main transformer, on two sections of described buses, be respectively connected to multiple transmission line circuits;

Between two sections of described buses, be provided with the wire inlet loop of the 3rd main transformer, the wire inlet loop of the 3rd main transformer comprises the 3rd main transformer, two circuit breakers and multiple isolating switch, described circuit breaker is between two isolating switches, after two circuit breaker parallel connections, connect with the 3rd main transformer, two circuit breakers are connected on two sections of buses, and the 3rd main transformer is connected across between two sections of buses by two circuit breakers.

2. single busbar connection dual-breaker sectional wiring structure according to claim 1, is characterized in that, described transmission line circuit comprises the multiple isolating switches and the circuit breaker that are cascaded, and described circuit breaker is between two isolating switches.

3. single busbar connection dual-breaker sectional wiring structure according to claim 1, it is characterized in that, the wire inlet loop of described the first main transformer comprises the first main transformer being cascaded, multiple isolating switch and a circuit breaker, and described circuit breaker is between two isolating switches.

4. single busbar connection dual-breaker sectional wiring structure according to claim 1, it is characterized in that, the wire inlet loop of described the second main transformer comprises the second main transformer being cascaded, multiple isolating switch and a circuit breaker, and described circuit breaker is between two isolating switches.

5. according to the single busbar connection dual-breaker sectional wiring structure described in claim 1-4 any one, it is characterized in that, described circuit breaker is isolated circuit breaker.

6. according to the single busbar connection dual-breaker sectional wiring structure described in claim 1-4 any one, it is characterized in that, described first paragraph bus and second segment bus are GIL bus.