CN203787789U - T and pi mixed net rack wiring structure applied to high voltage distribution - Google Patents

Abstract

A T, π hybrid network frame wiring structure for high-voltage power distribution, used for line-to-line substation wiring between the first and second high-voltage substations and the first, second, and third low-voltage substations, each low-voltage substation is distributed There are three transformers; the first transformer of the first low-voltage substation is connected to the first bus of the first high-voltage substation, the second transformer is connected to the second bus of the first high-voltage substation, and the third transformer is connected to the third bus of the first high-voltage substation connection; the first transformer of the second low-voltage substation is connected to the second busbar of the first high-voltage substation, the second transformer is connected to the third busbar of the first high-voltage substation, and the third transformer is connected to the second busbar of the second high-voltage substation; The first transformer of the three low-voltage substations is connected to the third busbar of the first high-voltage substation, the second substation is connected to the second busbar of the second high-voltage substation, and the first busbar of the second high-voltage substation of the third substation is connected, with simple structure, It is economical and practical, and is beneficial to the operation and maintenance of the grid.

Description

A T, π mixed grid connection structure for high voltage power distribution

technical field

The utility model relates to a line transformer assembly wiring structure used for high-voltage power distribution.

Background technique

At present, the grid connection mode of the high-voltage distribution network is mainly double-circuit chain and three-T connection. The double-circuit chain mostly uses inner bridge connection, which is conducive to load reverse supply and is suitable for central areas of important cities such as provincial capitals. However, the 110kV side of the substation needs to use two-input-two-outlet or three-input-three-outlet wiring with a busbar. The wiring is the most complicated, the number of switches is the largest, and the component failure rate is high; the T-shaped structure wiring is relatively simple and requires less investment. , the impact range of the fault is large; therefore, from the perspective of not losing the load after the fault, the reliability of the double-circuit chain connection is relatively high, and from the perspective of component failure rate, the reliability of the three-T connection is relatively high, and the current urban high-voltage distribution network cannot be very reliable. To realize the smooth transition of the wiring mode well, we face the problem of building and demolition.

Contents of the invention

The purpose of this utility model is to provide a T, π mixed grid connection structure for high-voltage power distribution, which is simple in structure, economical and practical, and beneficial to the operation and maintenance of the grid.

The purpose of this utility model is achieved through the following technical solutions:

Embodiment 1: A T, π hybrid network frame wiring structure for high-voltage power distribution, used for line-to-line substation wiring between the first and second high-voltage substations and the first, second, and third low-voltage substations. The feature is that each low-voltage substation is equipped with three transformers;

The first transformer of the first low-voltage substation is connected to the first busbar of the first high-voltage substation, the second transformer is connected to the second busbar of the first high-voltage substation, and the third transformer is connected to the third busbar of the first high-voltage substation;

The first transformer of the second low-voltage substation is connected to the second busbar of the first high-voltage substation, the second transformer is connected to the third busbar of the first high-voltage substation, and the third transformer is connected to the second busbar of the second high-voltage substation;

The first transformer of the third low-voltage substation is connected to the third busbar of the first high-voltage substation, the second substation is connected to the second busbar of the second high-voltage substation, and the first busbar of the second high-voltage substation of the third substation is connected.

Embodiment 2: A T, π hybrid grid connection structure for high-voltage power distribution, characterized in that it is used for line transformers between the first and second high-voltage substations and the first, second, and third low-voltage substations Assembled wiring, characterized in that: the first and third low-voltage substations are equipped with three transformers, and the second low-voltage substation is equipped with two transformers;

The first transformer of the first low-voltage substation is connected to the first busbar of the first high-voltage substation, the second transformer is connected to the second busbar of the first high-voltage substation, and the third transformer is connected to the first busbar of the second high-voltage substation;

The first transformer of the second low-voltage substation is connected to the first busbar of the second high-voltage substation, and the second transformer is connected to the second busbar of the first high-voltage substation;

The first transformer of the third low-voltage substation is connected to the second busbar of the first high-voltage substation, the second substation is connected to the first busbar of the second high-voltage substation, and the second busbar of the second high-voltage substation of the third substation is connected.

Embodiment 3: A T, π hybrid network frame wiring structure for high-voltage power distribution, used for line-to-line substation wiring between the first and second high-voltage substations and the first, second, and third low-voltage substations, which The feature is that each low-voltage substation is equipped with two transformers;

The first transformer of the first low-voltage substation is connected to the first busbar of the first high-voltage substation, and the second transformer is connected to the first busbar of the second high-voltage substation;

The first transformer of the second low-voltage substation is connected to the first busbar of the second high-voltage substation, and the second transformer is connected to the second busbar of the first high-voltage substation;

The first transformer of the third low-voltage substation is connected to the second busbar of the first high-voltage substation, and the second substation is connected to the second busbar of the second high-voltage substation.

The utility model has the following beneficial effects:

The network frame wiring provided by the utility model is between different 220kV substations, and three 110kV substations are powered by multiple 110kV lines, some of which are directly radiated from the 220kV substation to the 110kV substation for power supply, and the remaining 110kV lines are T-connected to each other, which belongs to the chain type The combination of wiring, the network frame wiring has the characteristics of both π connection and T connection, and is suitable for the areas where the original network frame has limited power supply capacity due to the cross section of the wire in Class A and B power supply areas, but the corridor resources are precious and it is difficult to open up new paths. The technical features are as follows:

(1) The scale of each substation is 2 to 3 main transformers.

(2) The high-voltage side of the 110kV substation can use the enlarged inner bridge or the inner bridge + line transformer group wiring, which occupies a smaller area than the double-chain under the same substation capacity;

(3) There is no influence between the high-voltage sides of the transformer;

(4) Substation 110kV two to three-circuit incoming line, less than double-circuit chain type;

(5) The cost of 110kV substation is low;

(6) The maintenance cost of 110kV substation is small, the operation is simple, and the safety is good, which is convenient for the operation and maintenance of the county-level power grid company;

(7) 1 to 2 large-section conductor lines are required between 220kV substations;

(8) 3-4 circuits can meet the requirements of N-1, and 5-6 circuits can meet the requirements of N-2;

(9) Two to three circuits of overhead lines are mostly erected on the same tower, and one circuit is powered off for maintenance, which affects the operation of other lines on the same tower;

(10) It has the characteristics of both π connection and T connection, which is convenient for the transition from π connection or radiation connection, so it is suitable for the county-level 110kV power grid where the existing grid structure is dominated by π connection and radiation.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Fig. 1 is a circuit diagram of Embodiment 1.

Fig. 2 is a circuit diagram of the second embodiment.

Fig. 3 is a circuit diagram of the third embodiment.

Detailed ways

Embodiment 1: As shown in Figure 1, a T, π hybrid grid connection structure for high-voltage power distribution is used for the first and second high-voltage substations 1 and 2 and the first, second and third low-voltage substations 3, 4, 5 line-to-line substation wiring, each low-voltage substation is equipped with three transformers;

The first transformer of the first low-voltage substation 3 is connected to the first busbar of the first high-voltage substation 1, the second transformer is connected to the second busbar of the first high-voltage substation 1, and the third transformer is connected to the third busbar of the first high-voltage substation 1 ;

The first transformer of the second low-voltage substation 4 is connected to the second busbar of the first high-voltage substation 1, the second transformer is connected to the third busbar of the first high-voltage substation 1, and the third transformer is connected to the second busbar of the second high-voltage substation 2 ;

The first transformer of the third low-voltage substation 5 is connected to the third busbar of the first high-voltage substation 1, the second substation is connected to the second busbar of the second high-voltage substation 2, and the first busbar of the second high-voltage substation 2 of the third substation is connected .

Embodiment 2: As shown in FIG. 2, a T, π hybrid grid connection structure for high-voltage power distribution is characterized in that it is used for the first and second high-voltage substations 1, 2 and the first, second, and The third low-voltage substation 3, 4, and 5 are connected to line-transformers. The first and third low-voltage substations 3 and 5 are equipped with three transformers, and the second low-voltage substation 4 is equipped with two transformers;

The first transformer of the first low-voltage substation 3 is connected to the first busbar of the first high-voltage substation 1, the second transformer is connected to the second busbar of the first high-voltage substation 1, and the third transformer is connected to the first busbar of the second high-voltage substation 2 ;

The first transformer of the second low-voltage substation 4 is connected to the first busbar of the second high-voltage substation 2, and the second transformer is connected to the second busbar of the first high-voltage substation 1;

The first transformer of the third low-voltage substation 5 is connected to the second busbar of the first high-voltage substation 1, the second substation is connected to the first busbar of the second high-voltage substation 2, and the second busbar of the second high-voltage substation 2 of the third substation is connected .

Embodiment 3: As shown in Figure 3, a T, π hybrid grid connection structure for high-voltage power distribution, used for the first and second high-voltage substations 1 and 2 and the first, second and third low-voltage substations 3, 4, 5 line-to-line substation wiring, each low-voltage substation is equipped with two transformers;

The first transformer of the first low-voltage substation 3 is connected to the first busbar of the first high-voltage substation 1, and the second transformer is connected to the first busbar of the second high-voltage substation 2;

The first transformer of the second low-voltage substation 4 is connected to the first busbar of the second high-voltage substation 2, and the second transformer is connected to the second busbar of the first high-voltage substation 1;

The first transformer of the third low-voltage substation 5 is connected to the second busbar of the first high-voltage substation 1 , and the second substation is connected to the second busbar of the second high-voltage substation 2 .

The above is only a preferred embodiment of the utility model, so the scope of implementation of the utility model cannot be limited with this, that is, equivalent changes and modifications made according to the patent scope of the utility model and the content of the specification should still be carried out. It belongs to the scope covered by the utility model patent.

Claims (3)

1. for T, the π hybrid network bridge joint line structure of high voltage power distribution, for the line change group wiring between first, second high voltage substation and first, second, third substation, it is characterized in that: each substation is equipped with three transformers;

The first transformer of the first substation is connected with the first bus of the first high voltage substation, and the second transformer is connected with the second bus of the first high voltage substation, and the 3rd transformer is connected with the triple bus-bar of the first high voltage substation;

The first transformer of the second substation is connected with the second bus of the first high voltage substation, and the second transformer is connected with the triple bus-bar of the first high voltage substation, and the 3rd transformer is connected with the second bus of the second high voltage substation;

The first transformer of the 3rd substation is connected with the triple bus-bar of the first high voltage substation, and the second transformer station is connected with the second bus of the second high voltage substation, and the first bus of the second high voltage substation of the 3rd transformer station connects.

2. the T for high voltage power distribution, π hybrid network bridge joint line structure, it is characterized in that: for the line change group wiring between first, second high voltage substation and first, second, third substation, it is characterized in that: the first, the 3rd substation arranges three transformers, the second substation arranges two transformers;

The first transformer of the first substation is connected with the first bus of the first high voltage substation, and the second transformer is connected with the second bus of the first high voltage substation, and the 3rd transformer is connected with the first bus of the second high voltage substation;

The first transformer of the second substation is connected with the first bus of the second high voltage substation, and the second transformer is connected with the second bus of the first high voltage substation;

The first transformer of the 3rd substation is connected with the second bus of the first high voltage substation, and the second transformer station is connected with the first bus of the second high voltage substation, and the second bus of the second high voltage substation of the 3rd transformer station connects.

3. for T, the π hybrid network bridge joint line structure of high voltage power distribution, for the line change group wiring between first, second high voltage substation and first, second, third substation, it is characterized in that: each substation is equipped with two transformers;

The first transformer of the first substation is connected with the first bus of the first high voltage substation, and the second transformer is connected with the first bus of the second high voltage substation;

The first transformer of the second substation is connected with the first bus of the second high voltage substation, and the second transformer is connected with the second bus of the first high voltage substation;

The first transformer of the 3rd substation is connected with the second bus of the first high voltage substation, and the second transformer station is connected with the second bus of the second high voltage substation.