CN204835226U - Line arrangement structure of two complete clusters is joined in marriage into in wiring of one and half circuit breakers - Google Patents

Abstract

The utility model discloses a circuit layout structure in which one and a half circuit breaker connections are connected into two complete strings, and belongs to the field of electrical main connection of electric power systems. The technical problem to be solved is to provide a wiring layout structure that does not require an isolating switch at the outlet. The technical solution is: the first circuit breaker, the second circuit breaker and the third circuit breaker are connected in sequence to form a complete string; the fourth circuit breaker, the fifth circuit breaker and the sixth circuit breaker are connected in sequence to form a complete string; The first circuit breaker is connected to the fourth circuit breaker, the second busbar is connected to the third circuit breaker and the sixth circuit breaker, the incoming line of main transformer I is connected between the first circuit breaker and the second circuit breaker, and the incoming line of main transformer II is connected to Between the fifth circuit breaker and the sixth circuit breaker, the outgoing line with the same name as I is connected between the second circuit breaker and the third circuit breaker, and the outgoing line with the same name as II is connected between the fourth circuit breaker and the fifth circuit breaker. Not only can the stability of operation be guaranteed, but also the investment cost can be saved.

Description

One and a half circuit breakers are wired into two complete strings of wiring arrangements

technical field

The utility model relates to the field of electrical main wiring of a power system, in particular to a line layout structure in which one and a half circuit breaker wiring is configured into two complete strings.

Background technique

One and a half circuit breaker wiring has outstanding advantages such as flexible operation scheduling, convenient operation and maintenance, and high reliability. It is currently widely used in 500kV hub substations. Article 5.1.8 of DL/T5218-2012 "Technical Regulations for Design of 220kV～750kV Substations" stipulates that in the connection of one and a half circuit breakers, when the initial line and substation are two complete strings, an isolating switch should be installed at the exit. Therefore, when the initial circuit of the substation is composed of 2 circuits of main transformer incoming lines and 2 circuits of outgoing lines with the same name to form two complete strings, an isolating switch should be installed at the exit of each circuit. The layout of the circuit is shown in Figure 1.

The function of setting the exit isolating switch: when a line with the same name or a transformer fails or needs to be out of operation for maintenance, the exit isolating switch of this circuit is opened, and the remaining 3 circuits can still form a loop operation. However, when there are more than two complete strings in the substation in the long term, the outgoing line isolating switch is not needed. If the installed outgoing line isolating switch is removed, not only the transformation of the power distribution device will take a lot of work, but also the removed isolating switch cannot be used, which is a waste of investment , if the installed outlet isolating switch is not removed, it will increase the complexity of the operation and is not convenient for operation.

In the initial stage of the substation, when 2 incoming lines of the main transformer and 2 outgoing lines with the same name are combined into two complete strings, if the exit isolating switch in the line layout structure shown in Figure 1 is directly canceled, when a certain outgoing line or transformer with the same name appears When it is necessary to stop running due to fault or maintenance, the circuit breaker connected to this circuit needs to be disconnected, and the remaining 3 circuits run in open loop. The whole system is out of service, for example: if the circuit layout structure shown in Figure 1 is cancelled, if the isolating switch at each exit is cancelled, when the I main transformer incoming line 31 fails and needs to be shut down for maintenance, it is necessary to disconnect the I main transformer incoming line 31 connected to the first circuit breaker 21 and the second circuit breaker 22, if during the outage and maintenance of the incoming line 31 of the I main transformer, the outgoing line 42 of the same name of the II also fails and needs to be out of service for maintenance, it is necessary to disconnect the outgoing line 42 of the same name of the II The fifth circuit breaker 25 and the sixth circuit breaker 26, at this time, the incoming line 32 of the main transformer II and the outgoing line 41 with the same name of the first line cannot be connected, and the whole system is out of service.

Utility model content

The technical problem to be solved by the utility model is to provide a circuit layout structure in which one and a half circuit breakers are wired into two complete strings without setting an isolating switch at the exit, which can not only ensure the stability of operation, but also save investment costs .

The utility model solves its technical problems by connecting one and a half circuit breakers into two complete strings of circuit layout structures, including busbar I, busbar II, first circuit breaker, second circuit breaker, third circuit breaker, fourth Circuit breaker, fifth circuit breaker, sixth circuit breaker, I main transformer incoming line, II main transformer incoming line, I outgoing line with the same name and II outgoing line with the same name, the first circuit breaker, the second circuit breaker and the third circuit breaker are sequentially connected to form a complete string, the fourth circuit breaker, the fifth circuit breaker and the sixth circuit breaker are connected in turn to form a complete string, the I busbar is connected to the first circuit breaker and the fourth circuit breaker, and the II busbar is connected to the The third circuit breaker and the sixth circuit breaker are connected, the incoming line of the main transformer I is connected between the first circuit breaker and the second circuit breaker, and the incoming line of the main transformer II is connected between the fifth circuit breaker and the sixth circuit breaker. Between the circuit breakers, the outgoing line with the same name as I is connected between the second circuit breaker and the third circuit breaker, and the outgoing line with the same name as II is connected between the fourth circuit breaker and the fifth circuit breaker.

The beneficial effects of the utility model are: in the circuit arrangement structure in which one and a half circuit breakers are wired into two complete strings, the two incoming lines of the main transformer and the two outgoing lines of the same name are arranged crosswise into different busbars, which is different from the existing ones. In the existing technology, compared with the line layout structure provided with the outgoing line isolating switch, the reliability of the operation of the substation is equivalent. Not only can the stability of operation be guaranteed, but also there is no need to set an outgoing line isolating switch, which can save investment costs.

Description of drawings

Fig. 1 is the structural representation of prior art;

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

As shown in the figure: I busbar 11, II busbar 12, first circuit breaker 21, second circuit breaker 22, third circuit breaker 23, fourth circuit breaker 24, fifth circuit breaker 25, sixth circuit breaker 26, I Main transformer incoming line 31, II main transformer incoming line 32, I same name outgoing line 41, II same name outgoing line 42, first isolating switch 51, second isolating switch 52, third isolating switch 53, fourth isolating switch 54.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 2, one and a half circuit breakers of the utility model are wired into two complete strings of circuit layout structures, which are characterized in that they include busbar I 11, busbar II 12, first circuit breaker 21, and second circuit breaker 22 , the third circuit breaker 23, the fourth circuit breaker 24, the fifth circuit breaker 25, the sixth circuit breaker 26, I main transformer incoming line 31, II main transformer incoming line 32, I same name outgoing line 41 and II same name outgoing line 42, so The first circuit breaker 21, the second circuit breaker 22 and the third circuit breaker 23 are connected in sequence to form a complete string, and the fourth circuit breaker 24, the fifth circuit breaker 25 and the sixth circuit breaker 26 are connected in sequence to form a complete string , the I bus 11 is connected to the first circuit breaker 21 and the fourth circuit breaker 24, the II bus 12 is connected to the third circuit breaker 23 and the sixth circuit breaker 26, and the I main transformer incoming line 31 is connected to the between the first circuit breaker 21 and the second circuit breaker 22, the II main transformer incoming line 32 is connected between the fifth circuit breaker 25 and the sixth circuit breaker 26, and the I same-name outgoing line 41 is connected to the second circuit breaker Between the circuit breaker 22 and the third circuit breaker 23, the outgoing line 42 with the same name as II is connected between the fourth circuit breaker 24 and the fifth circuit breaker 25.

As shown in Figure 2, when a certain outlet circuit with the same name fails or needs to be out of operation for maintenance, after the circuit breaker connected to it is opened, a line with two transformers can be formed; when a transformer fails or needs to be withdrawn for maintenance During operation, after the circuit breaker connected to it is opened, it can form a connection with two lines and one change.

As shown in Figure 2, when the incoming line 31 of the main transformer I fails and needs to be shut down for maintenance, the first circuit breaker 21 and the second circuit breaker 22 connected to the incoming line 31 of the main transformer I are disconnected. 31. During outage maintenance, if the outgoing line 42 of the same name of II also breaks down and needs to be out of service for maintenance, the fourth circuit breaker 24 and the fifth circuit breaker 25 connected to the outgoing line 42 of the same name of II are disconnected. At this time, the main transformer incoming line 32 and the The outgoing lines 41 of the same name are still connected through the sixth circuit breaker 26 , the second bus bar 12 and the third circuit breaker 23 .

As shown in Figure 2, when only one outlet circuit with the same name fails or needs to be out of operation for maintenance, the substation can still maintain the operation mode of one line with two transformers; when two outlet circuits with the same name fail or need to be out of operation for maintenance, The whole station loses power; and the line layout structure with outgoing line isolating switch shown in Figure 1, when two outgoing lines with the same name fail or need to be out of operation for maintenance, the whole station will also lose power.

Therefore, in the circuit layout structure in which one and a half circuit breakers are wired into two complete strings in the utility model, the two incoming lines of the main transformer and the two outgoing lines with the same name are crossed and arranged into different busbars, which is different from the arrangement shown in Figure 1. Compared with the line layout structure of the outlet disconnector, the reliability of substation operation is equivalent. Not only can the stability of operation be guaranteed, but also there is no need to set an outgoing line isolating switch, which can save investment costs.

Claims (1)

1. bus scheme with one and half breaker is made into the line arrangement structure of two complete strings, it is characterized in that: comprise I bus (11), II bus (12), first circuit breaker (21), second circuit breaker (22), 3rd circuit breaker (23), 4th circuit breaker (24), 5th circuit breaker (25), 6th circuit breaker (26), I main transformer inlet wire (31), II main transformer inlet wire (32), I outlet of the same name (41) and II outlet of the same name (42), described first circuit breaker (21), second circuit breaker (22) and the 3rd circuit breaker (23) are in turn connected to form a complete string, described 4th circuit breaker (24), 5th circuit breaker (25) and the 6th circuit breaker (26) are in turn connected to form a complete string, described I bus (11) and the first circuit breaker (21), 4th circuit breaker (24) connects, described II bus (12) and the 3rd circuit breaker (23), 6th circuit breaker (26) connects, described I main transformer inlet wire (31) is connected between described first circuit breaker (21) and the second circuit breaker (22), described II main transformer inlet wire (32) is connected between the 5th circuit breaker (25) and the 6th circuit breaker (26), described I outlet of the same name (41) is connected between the second circuit breaker (22) and the 3rd circuit breaker (23), described II outlet of the same name (42) is connected between the 4th circuit breaker (24) and the 5th circuit breaker (25).