CN204577857U - A kind of 110kV transformer station adopting novel wire connecting way - Google Patents

Abstract

The utility model discloses a 110kV substation adopting a new wiring mode, which mainly solves the problems existing in the existing wiring mode of the substation with 4 outgoing lines for 110kV. Connected, it includes 4 outlet circuit breakers, 4 110kV busbars, 2 busbar section circuit breakers, 4 main transformer high-voltage side circuit breakers, 4 main transformers, 4 main transformer low-voltage side circuit breakers, and 4 main wiring and 3 main wiring section circuit breakers. The utility model solves the problem of the operation of the double power supply ring network by adopting the cross-type double-single bus segmental wiring mode for the substation with 4 outgoing lines of 110kV, and through the symmetrical arrangement, it contains a line crossing, thereby avoiding the transmission line The emergence of problems caused by crossover has laid a good foundation for optimizing the design scheme of transmission lines.

Description

A 110kV substation with a new wiring method

technical field

The utility model relates to the technical field of power system substations, in particular to a 110kV substation adopting a new wiring mode, which is used to solve the problems existing in the existing wiring mode of the 110kV substation with 4 outgoing lines.

Background technique

The power system is a network composed of transformers, transmission lines, and electrical equipment, including all equipment connected to the network by electrical or mechanical means. These interconnected elements in the power system can be divided into two categories, one is the power element, which produces (generators), transforms (transformers, rectifiers, inverters), transmits and distributes electric energy (power transmission lines, distribution network ), consumption (load); the other is the control element, which changes the operating state of the system, such as the excitation regulator, governor and relay of the synchronous generator.

The substation is the intermediate link between the power plant and the user. It is the power equipment in the power system that transforms the voltage, receives and distributes electric energy, controls the flow of power and adjusts the voltage. and the role of distributing electrical energy.

Due to limited conditions, there are still many 110kV substations with four 110kV outgoing lines. According to the load characteristics of these substations, there are many restrictions on the selection of wiring forms, and the existing wiring methods have brought many problems.

At present, the main wiring types of 110kV substations generally adopt line-to-substation wiring, bridge wiring, double busbar wiring and single busbar segmental wiring.

1. Line-to-line substation wiring is the most concise wiring method with the simplest wiring, the least equipment, and no need for high-voltage power distribution devices. However, some 110kV substations are not pure terminal substations, and there are certain cross-through capacity requirements, and the security of the load The capacity is large, so it is difficult to introduce it from other power sources, and it can only rely on its own power lines for mutual backup. Therefore, it is difficult for the line-to-line transformer wiring to meet the reliability requirements.

2. Bridge connection is divided into double inner bridge connection and double outer bridge connection.

(1) Double inner bridge wiring. Bridge connection and enlarged bridge connection are generally used for 110kV line with 3 or less outlets, and are not suitable for 110kV lines with more than 4 outlets. If the substation load does not require crossing power, a double inner bridge connection can be used, which is a transformer with double incoming lines, and the substation is converted from the inner bridge connection. Years of operating experience show that inner bridge wiring is a safe, reliable and economical main wiring method. If the ride-through power is intermittent and the ride-through power is not large, it is difficult to perform secondary setting of the circuit breaker when the inner bridge wiring is running through the power. In this case, it is not suitable to use the double inner bridge wiring.

(2) Double outer bridge wiring. Taking into account the ride-through power of the power system where the power plant is connected to the grid. The double-outer bridge connection method can be used, but considering that some substations have a large load, the double-outer bridge connection method has a greater impact on the operational flexibility inside the substation, so it is not suitable to use the double-outer bridge connection method.

3. The double-bus wiring method is a main wiring method with the highest power supply reliability, flexible scheduling, convenient expansion and easy realization. However, according to (35-110kV substation design specifications), the 110kV line is 6 circuits or more, and it is suitable Double-busbar wiring is used, but if there are only 4 outgoing lines in the 110kV substation, the configuration conditions for double-busbars cannot be met.

4. Segmented wiring of single busbar is to use circuit breaker to divide the busbar into sections. For important users, two circuits can be drawn from different sections and powered by two power sources; when a section of busbar fails, the sectioned circuit breaker will automatically cut off the faulty section , to ensure the uninterrupted power supply of the bus in the normal section and not cause power outages for important users.

From the above analysis, it can be seen that for the main wiring of a 110kV substation with only 4 circuits of 110kV outgoing lines, it is more appropriate to configure single-bus section wiring.

The conventional single-bus section wiring method is shown in Figure 1. 110kV substation with 4 circuits of 110kV outgoing lines, 4 circuits of power supply to the power plant and 110kV busbar of 220kV substation. If the single-bus section wiring is used, the 110kV power supply will be connected to the grid for a long time, and in order to avoid circulating currents and facilitate grid management, the 110kV primary grid generally does not allow two power supplies to operate in parallel. Therefore, the conventional single-bus section wiring method cannot meet the requirements of the power grid management system.

In order to avoid the problem of the power ring network, it can be solved by double-bus wiring and single-bus multi-section wiring, but the double-bus wiring and single-bus multi-section wiring are obviously insufficient in terms of economy and flexibility.

Utility model content

In view of the above shortcomings, the utility model provides a 110kV substation using a new wiring method, which can effectively solve the problems existing in the existing wiring method of the 110kV substation with 4 outgoing lines.

The technical solution adopted by the utility model to solve the technical problem is: a 110kV substation adopting a new wiring method, the 110kV substation is arranged between the power plant and the 220kV substation connected to the power grid, and connected to the power plant through 2 outgoing lines, It is connected to the 220kV substation through 2 outgoing lines, which is characterized by including the first outgoing line circuit breaker, the second outgoing line circuit breaker, the third outgoing line circuit breaker, the fourth outgoing line circuit breaker, the first 110kV bus, the second 110kV bus, the second The third 110kV bus, the fourth 110kV bus, the first bus segment circuit breaker, the second bus segment circuit breaker, the first main transformer high voltage side circuit breaker, the second main transformer high voltage side circuit breaker, the third main transformer high voltage side circuit breaker breaker, fourth main transformer high-voltage side circuit breaker, first main transformer, second main transformer, third main transformer, fourth main transformer, first main transformer low-voltage side circuit breaker, second main transformer low-voltage side circuit breaker, second main transformer The circuit breaker on the low-voltage side of the third main transformer, the circuit breaker on the low-voltage side of the fourth main transformer, the first main wiring, the second main wiring, the third main wiring, the fourth main wiring, the first main wiring section circuit breaker, and the second main wiring Sectional circuit breaker and third main wiring section circuit breaker; the first 110kV bus is connected to the first power supply line of the power plant through the first outlet circuit breaker, and connected to the first main transformer through the high-voltage side circuit breaker of the first main transformer , the first main transformer is connected to the first main wiring through the first main transformer low-voltage side circuit breaker; the second 110kV busbar is connected to the second power supply line of the power plant through the second outlet circuit breaker, and the high-voltage The side circuit breaker is connected to the second main transformer, and the second main transformer is connected to the second main wiring through the second main transformer low-voltage side circuit breaker; the third 110kV bus is connected to the first power supply of the 220kV substation through the third outlet circuit breaker The third main transformer is connected to the third main transformer through the circuit breaker on the high-voltage side of the third main transformer, and the third main transformer is connected to the third main wiring through the circuit breaker on the low-voltage side of the third main transformer; the fourth 110kV busbar is connected to the third main transformer through the The four-outlet circuit breaker is connected to the second power supply line of the 220kV substation, and is connected to the fourth main transformer through the fourth main transformer high-voltage side circuit breaker, and the fourth main transformer is connected to the fourth main transformer through the fourth main transformer low-voltage side circuit breaker. The first bus section circuit breaker is connected between the second 110kV bus and the third 110kV bus, and the second bus section circuit breaker is connected between the first 110kV bus and the fourth 110kV bus; the first main wiring and the second The first main wiring sectional circuit breaker is connected between the two main wirings, the second main wiring sectional circuit breaker is connected between the second main wiring and the third main wiring, and the third main wiring and the fourth main wiring are connected There is a third main wiring section breaker.

Preferably, the 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.

Preferably, the two ends of the first bus section circuit breaker and the second bus section circuit breaker are respectively provided with section disconnectors.

Preferably, the two ends of the first main wiring section circuit breaker, the second main wiring section circuit breaker and the third main wiring section circuit breaker are respectively provided with section isolating switches.

Preferably, the two ends of the high voltage side circuit breaker of the first main transformer, the high voltage side circuit breaker of the second main transformer, the high voltage side circuit breaker of the third main transformer and the high voltage side circuit breaker of the fourth main transformer are respectively provided with section isolation switch.

Preferably, the two ends of the low-voltage side circuit breaker of the first main transformer, the low-voltage side circuit breaker of the second main transformer, the low-voltage side circuit breaker of the third main transformer and the low-voltage side circuit breaker of the fourth main transformer are respectively provided with section isolation switch.

The beneficial effects of the utility model are: the utility model solves the problem of the operation of the dual power supply ring network by adopting the cross-type double-single bus segment wiring mode for the substation with 4 circuits of 110kV outlets, and through the symmetrical arrangement, it contains a Line crossing avoids the problems caused by transmission line crossing, and lays a good foundation for optimizing the design scheme of transmission lines.

The utility model aims at the characteristics of the 110kV substation with only 4 outgoing lines, and adopts the double-single busbar segmented wiring mode to better meet the needs of some projects. Although this double-single busbar segmental main wiring mode is relatively rare, it can Under the special conditions of the project, it is a flexible and applicable wiring method.

Description of drawings

Fig. 1 is a structural schematic diagram of the main wiring system of a 11110kV substation using a single-bus section wiring method in the prior art;

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

In the figure, the first power supply line of 11 power plant, the second power supply line of 12 power plant, the first power supply line of 13 220kV substation, the second power supply line of 14 220kV substation, the first outlet circuit breaker of 21, the second outlet circuit breaker of 22, the third Outgoing circuit breaker, 24 fourth outgoing circuit breaker, 31 first 110kV busbar, 32 second 110kV busbar, 33 third 110kV busbar, 34 fourth 110kV busbar, 41 first busbar section circuit breaker, 42 second busbar section Circuit breaker, 51 high voltage side circuit breaker of the first main transformer, 52 high voltage side circuit breaker of the second main transformer, 53 high voltage side circuit breaker of the third main transformer, 54 high voltage side circuit breaker of the fourth main transformer, 61 first main transformer, 62 The second main transformer, 63 the third main transformer, 64 the fourth main transformer, 71 the first main transformer low-voltage side circuit breaker, 72 the second main transformer low-voltage side circuit breaker, 73 the third main transformer low-voltage side circuit breaker, 74 the fourth Main transformer low-voltage side circuit breaker, 81 first 35kV main wiring, 82 second 35kV main wiring, 83 third 35kV main wiring, 84 fourth 35kV main wiring, 91 first main wiring section circuit breaker, 92 second main wiring Sectional circuit breaker, 93 third main wiring section circuit breaker.

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 Fig. 2, a kind of 110kV substation of the utility model adopts the new wiring mode, and described 110kV substation is arranged between the power plant and the 220kV substation connected to the power grid, and it includes the first outlet circuit breaker 21, the second outlet circuit breaker 22, the third outlet circuit breaker 23, the fourth outlet circuit breaker 24, the first 110kV bus 31, the second 110kV bus 32, the third 110kV bus 33, the fourth 110kV bus 34, the first bus section circuit breaker 41, The second bus section circuit breaker 42, the first main transformer high voltage side circuit breaker 51, the second main transformer high voltage side circuit breaker 52, the third main transformer high voltage side circuit breaker 53, the fourth main transformer high voltage side circuit breaker 54, the The first main transformer 61, the second main transformer 62, the third main transformer 63, the fourth main transformer 64, the first main transformer low-voltage side circuit breaker 71, the second main transformer low-voltage side circuit breaker 72, the third main transformer low-voltage side circuit breaker 73, the fourth main transformer low-voltage side circuit breaker 74, the first 35kV main wiring 81, the second 35kV main wiring 82, the third 35kV main wiring 83, the fourth 35kV main wiring 84, the first main wiring section circuit breaker 91 , the second main wiring section circuit breaker 92 and the third main wiring section circuit breaker 93; the first 110kV bus bar 31 is connected to the first power supply line 11 of the power plant through the first outgoing line circuit breaker 21, and the first main transformer The high-voltage side circuit breaker 51 is connected to the first main transformer 11, and the first main transformer 51 is connected to the first 35kV main connection 81 through the first main transformer low-voltage side circuit breaker 61; the second 110kV bus bar 32 is connected to the second outgoing line The circuit breaker 22 is connected to the second power supply line 12 of the power plant, and is connected to the second main transformer 62 through the second main transformer high-voltage side circuit breaker 52, and the second main transformer 62 is connected to the second main transformer 62 through the second main transformer low-voltage side circuit breaker 72. Two 35kV main wirings 82 are connected; the third 110kV busbar 33 is connected to the first power supply line 13 of the 220kV substation through the third outlet circuit breaker 23, and is connected to the third main transformer 63 through the third main transformer high voltage side circuit breaker 53, The third main transformer 63 is connected to the third 35kV main wiring 83 through the third main transformer low-voltage side circuit breaker 73; the fourth 110kV busbar 34 is connected to the second power supply line 14 of the 220kV substation through the fourth outlet circuit breaker 24, And the fourth main transformer 64 is connected to the fourth main transformer 64 through the fourth main transformer high-voltage side circuit breaker 54, and the fourth main transformer 64 is connected to the fourth 35kV main connection 84 through the fourth main transformer low-voltage side circuit breaker 74; the second 110kV bus bar 32 The first bus section circuit breaker 41 is connected with the third 110kV bus 33, the second bus section circuit breaker 42 is connected between the first 110kV bus 31 and the fourth 110kV bus 34; the first 35kV main wiring 81 and The first main wiring section circuit breaker 91 is connected between the second 35kV main wiring 82, the second main wiring section circuit breaker 92 is connected between the second 35kV main wiring 82 and the third 35kV main wiring 83, and the third 35kV There is a connection between the main wiring 83 and the fourth 35kV main wiring 84 The third main line section circuit breaker 93 .

Preferably, both ends of all the above-mentioned circuit breakers are provided with isolating switches.

In the normal operation mode of the utility model, the circuit breaker of the bus section is disconnected, and the line operates in the mode of line change group, and the operation mode is clear and reliable; The section circuit breaker can realize the reduction of standby power supply; when the power plant is required to transmit the on-grid electricity to the system, it only needs to close the section circuit breaker.

By adopting the cross-type double-single bus segmental wiring method for the substation with 4 outgoing lines of 110kV, the problem of the operation of the double power supply ring network is solved, and through the symmetrical arrangement, there is a line crossing included, thereby avoiding the transmission line crossing. The emergence of problems has laid a good foundation for optimizing the design scheme of transmission lines.

In view of the characteristics of the 110kV substation with 4 outgoing lines, the segmented wiring of double-single busbars better meets the needs of the substation project. The double-single bus section has certain requirements: first, the number of outgoing circuits is required to be 4; second, the substation is a substation for power receiving users, and multi-circuit power supply; third, the power supply load of the line is relatively large, and the reserve transmission capacity is small. The flexibility requirements are low; Fourth, the substation is not suitable for line-to-line transformation group wiring. Although the double-single bus section wiring method is relatively rare, it is a flexible and applicable wiring method under certain special engineering conditions. It can effectively solve the problems existing in the existing wiring method of a 110kV substation with 4 outgoing lines. question.

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 (6)

1. one kind adopts the 110kV transformer station of novel wire connecting way, described 110kV transformer station is arranged between the 220kV transformer station of power plant and access electrical network, and returns back out line circuit by 2 and be connected with power plant, returns back out line circuit be connected with 220kV transformer station by 2, it is characterized in that, comprise the first wire-outgoing breaker, second wire-outgoing breaker, 3rd wire-outgoing breaker, 4th wire-outgoing breaker, one 110kV bus, 2nd 110kV bus, 3rd 110kV bus, 4th 110kV bus, first bus section breaker, second bus section breaker, first main transformer high-pressure side circuit breaker, second main transformer high-pressure side circuit breaker, 3rd main transformer high-pressure side circuit breaker, 4th main transformer high-pressure side circuit breaker, first main transformer, second main transformer, 3rd main transformer, 4th main transformer, first main transformer low-pressure side circuit breaker, second main transformer low-pressure side circuit breaker, 3rd main transformer low-pressure side circuit breaker, 4th main transformer low-pressure side circuit breaker, first main electrical scheme, second main electrical scheme, 3rd main electrical scheme, 4th main electrical scheme, first main electrical scheme section breaker, second main electrical scheme section breaker and the 3rd main electrical scheme section breaker, a described 110kV bus is connected with supply line of power plant first by the first wire-outgoing breaker, and is connected with the first main transformer by the first main transformer high-pressure side circuit breaker, and described first main transformer is connected with the first main electrical scheme by the first main transformer low-pressure side circuit breaker, described 2nd 110kV bus is connected with supply line of power plant second by the second wire-outgoing breaker, and is connected with the second main transformer by the second main transformer high-pressure side circuit breaker, and described second main transformer is connected with the second main electrical scheme by the second main transformer low-pressure side circuit breaker, described 3rd 110kV bus is connected with supply line of 220kV transformer station first by the 3rd wire-outgoing breaker, and be connected with the 3rd main transformer by the 3rd main transformer high-pressure side circuit breaker, described 3rd main transformer is connected with the 3rd main electrical scheme by the 3rd main transformer low-pressure side circuit breaker, described 4th 110kV bus is connected with supply line of 220kV transformer station second by the 4th wire-outgoing breaker, and be connected with the 4th main transformer by the 4th main transformer high-pressure side circuit breaker, described 4th main transformer is connected with the 4th main electrical scheme by the 4th main transformer low-pressure side circuit breaker, be connected with the first bus section breaker between 2nd 110kV bus and the 3rd 110kV bus, between a 110kV bus and the 4th 110kV bus, be connected with the second bus section breaker, the first main electrical scheme section breaker is connected with between first main electrical scheme and the second main electrical scheme, be connected with the second main electrical scheme section breaker between second main electrical scheme and the 3rd main electrical scheme, between the 3rd main electrical scheme and the 4th main electrical scheme, be connected with the 3rd main electrical scheme section breaker.

2. a kind of 110kV transformer station adopting novel wire connecting way according to claim 1, it is characterized in that, the two ends of the first described wire-outgoing breaker, the second wire-outgoing breaker, the 3rd wire-outgoing breaker and the 4th wire-outgoing breaker are respectively arranged with outlet isolating switch.

3. a kind of 110kV transformer station adopting novel wire connecting way according to claim 1, is characterized in that, the first described bus section breaker and the two ends of the second bus section breaker are respectively arranged with sectionalizer.

4. a kind of 110kV transformer station adopting novel wire connecting way according to claim 1, it is characterized in that, the two ends of the first described main electrical scheme section breaker, the second main electrical scheme section breaker and the 3rd main electrical scheme section breaker are respectively arranged with sectionalizer.

5. a kind of 110kV transformer station adopting novel wire connecting way according to claim 1, it is characterized in that, the two ends of the first described main transformer high-pressure side circuit breaker, the second main transformer high-pressure side circuit breaker, the 3rd main transformer high-pressure side circuit breaker and the 4th main transformer high-pressure side circuit breaker are respectively arranged with sectionalizer.

6. a kind of 110kV transformer station adopting novel wire connecting way according to claim 1, it is characterized in that, the two ends of the first described main transformer low-pressure side circuit breaker, the second main transformer low-pressure side circuit breaker, the 3rd main transformer low-pressure side circuit breaker and the 4th main transformer low-pressure side circuit breaker are respectively arranged with sectionalizer.