RU154342U1 - OPEN DISTRIBUTION DEVICE OF SUBSTATION - Google Patents

Abstract

The utility model relates to the field of electric power industry, in particular, to electric substations.

The purpose of the utility model is to increase the reliability of power supply of two power transformers of the substation and power consumers on one or two of the three outgoing power lines.

The goal is achieved by the fact that the open switchgear of the substation containing the equipment for connecting the first 1VL, second 2VL and third ZVL of power lines, as well as equipment: 1Q and 2Q circuit breakers with 7QS, 8QS and 9QS, 10QS “double bridge” disconnectors, respectively each circuit breaker (1Q and 2Q) is supplemented by repair bypass shunts from disconnectors 11QS1, 11QS2 and 12QS1, 12QS2. Accordingly, the first repair bypass shunt 11QS1, 11QS2 connects the first and third power lines and the second repair bypass shunt 12QS1, 12QS2 connects the second and third power lines, and the conductor between the two adjacent disconnectors of the repair bypass shunts is connected to the conductor between the two adjacent disconnect switches , via an optional 6QS disconnector.

Description

The utility model relates to the field of electric power industry, in particular, to electric substations.

Known / 1 / electrical diagram and layout of equipment - open switchgear substation "Double bridge with separators in the transformer chains" with three connections of power lines (first, second and middle third).

This circuit has several drawbacks: in particular, the transformers are connected through a separator-short circuit system, which is inferior in circuit reliability to circuits using circuit breakers (vacuum, gas and other media in a quench chamber). Another significant drawback is the lack of direct galvanic communication using disconnectors between the first, second and third lines from the side of power lines. This connection is necessary from the side of power lines, since any, one or both of the “Double Bridge” switches can be disconnected during an accident or repair, while the transit of electric power to the side of power transformers, as well as between power lines will stop.

The connection of the disconnectors between the power lines will allow for the decommissioning of one of the listed lines to power both power transformers through the remaining power line.

The purpose of the utility model is to increase the reliability of power supply to both power transformers of the substation and power consumers on one or two of the three outgoing power lines.

The goal is achieved in that the open switchgear of the substation, containing equipment for connecting the first, second and third power lines, as well as the equipment of the “double bridge” between them, is supplemented, each switch of the “double bridge” with repair bypass shunts from the disconnectors. Accordingly, the first repair bypass shunt connects the first and third power lines and the second repair bypass shunt connects the second and third power lines, with the conductor between two adjacent disconnectors of the repair bypass shunts being connected to the conductor between two adjacent disconnectors of the “double bridge” circuit breakers, via an additional disconnector.

The figures 1 and 2 show:

1VL, 2VL and ZVL - the first, second and third connected power lines;

1TV, 2TV and 3TV voltage transformers connected respectively to the first, second and third power lines;

1QS, 3QS and 5QS disconnectors for equipment connecting the first, second and third power lines;

7QS, 8QS - disconnectors to the 1Q switch;

9QS, 10QS - disconnectors to the 2Q switch;

Switches 1Q and 2Q, respectively, with disconnectors 7Q, 8Q and 9Q, 10Q form a "double bridge";

11QS1, 11QS2 and 12QS1, 12QS2; 6QS - disconnectors repair bypass shunts, respectively, switches 1Q and 2Q;

6QS - disconnector, designed to connect the midpoints of the bypass shunts and the "double bridge";

1BP, 2BP and ZBP blocks of connection to the power line (1VL, 2VL and ZVL) containing high-frequency communication equipment and voltage transformers (1TV, 2TV and 3TV) and surge arresters (1UF, 2UF, 3UF);

1TA, 2TA and 5TA - current transformers in the connection of the first, second and third power lines, respectively;

ZTA and 4TA - current transformers in the electrical circuit of switches 1Q, 2Q, respectively;

OP - end support 110 (220) kV;

1P, 2P and ZP - portals;

1SSh, 2SSh and ZSSh - tires.

The proposed device operates as follows:

1 mode: emergency or repair mode with the disconnection of one of the two power lines 1VL (2VL), while the 1Q (2Q) switch with its disconnectors 7QS and 8QS (9QS and 10QS) are also turned off, then in this mode both power transformers IT and 2T will be in operation thanks to disconnectors 11QS1, 11QS2 and 12QS1, 12QS2 repair bypass shunts. Through disconnectors 11QS1, 11QS2 and 12QS1, 12QS2, electric power is transited to both power transformers IT and 2T.

2 mode: emergency or repair mode with the disconnection of one of the two 1Q (2Q) circuit breakers or 7QS, 8QS (9QS and 10QS) disconnectors, respectively, then in this mode the transit of electric power between power lines 1VL, 2VL and ZVL will be saved due to 11QS1 disconnectors , 11QS2 and 12QS1, 12QS2 maintenance bypass shunts.

3 mode: repair of disconnectors 11QS1, 11QS2 and 12QS1, 12QS2 repair bypass shunts is carried out in stages by sequentially, adjacent, connected on each side of the disconnectors, which are also disconnected. In this step-by-step mode, the electric power will be transited at the beginning through the 1Q switch and upon completion of the repair of this stage, then through the 2Q switch of the repair of another stage.

The arrangement of outdoor switchgear equipment of the proposed circuit is shown in figure 2.

From the end support of the OP, the descents of power lines 1VL, 2VL and ZVL to the receiving portals 1P, 2P and ZP were made. In the axis of the portal and buses 1SSh, 2SSh and ZSSh for connecting power transformers IT and 2T, the switching and measuring equipment of the first power line (1VL) and for the first power transformer IT are cascaded and form the first row of equipment and 1SSh: 1BP + 1UF, 1TV, 1QS, 1TA, 2QS, and, accordingly, the second power line (VL2) for the second 2T power transformer, forming the second row of equipment and 2SSh: 2BP + 2UF, 2TV, 3QS, 2TA, 4QS. The third power transmission line of ZVL and ZSSh buses forms the third row of equipment: 3БП + 3UF, 3TV, 5QS, 6QS and 5ТА. Further equipment, including: 7QS, 1Q, 8QS and 9QS, 2Q, 10QS form the so-called "double bridge" between the disconnectors 1QS, 5QS and 3QS. The proposed repair bypass shunts (repair jumper) are formed by 11QS1 (2) and 12QS1 (2) disconnectors and supplemented by 6QS disconnector. At the same time, 6QS connects the midpoints of the maintenance bypass shunt and the “double bridge”.

Moreover, the conductors (tires) between the equipment 7QS, 1Q, 8QS and 9QS, 2Q, 10QS of the “double bridge” and 6QS are made of aluminum alloy pipes with supporting structures of different elevations.

Information taken into account:

1) The scheme of connection to the network of step-up substations Fig. 4.9 “double bridge”. Reference for the design of electric power systems. Ed. S.S. Rokotyan and I.M., Shapiro. M .: Energoatomizdat, 1985

Claims (2)

1. An open switchgear of a substation containing equipment for connecting the first, second and third power lines, as well as equipment of a “double bridge” between them, characterized in that it is supplemented by each switch of a “double bridge”, bypass repair shunts from disconnectors, respectively, the first a maintenance bypass shunt connects the first and third power lines and a second repair bypass shunt connects the second and third power lines. 2. The open switchgear of the substation according to claim 1, characterized in that the conductor between the two adjacent disconnectors of the repair bypass shunts is connected to the conductor between the two adjacent disconnectors of the “double bridge” circuit breakers through an additional disconnector.

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