SU1760589A1 - Switchgear - Google Patents

Abstract

Usage: high voltage switchgear at electrical substations. SUMMARY OF THE INVENTION: The switchgear comprises an input cell, a working busbar system, a shunt busbar system connected to the operating one via a shunt switch. The device also contains cells of the outgoing lines with disconnecting devices; two power contacts of automatic switching devices connected to the working and shunting systems of busbars 1 sludge are installed in the line circuit.

Description

The invention relates to the field of electric power industry and can be used on AC electrical substations in high voltage switchgears.

Switchgears are known in which electric power is supplied through an input device to busbars and distributed to consumers by outgoing lines (see typical materials for design 407-03 -456.87 Gosstroy USSR, Central Institute for Typical Design. Sverdlovsk branch).

The closest to the claimed one is the switchgear, which consists of an input device connected through a switch and disconnecting device (disconnectors, disconnecting contacts, etc.) to the working system of busbars and outgoing lines connected to The same system through switches and disconnecting devices (see Typical Materials for Design 407-03-456.87 Album I Scheme 10-1 sheet 73).

In switchgear circuits with connections connected through a switch (input and outgoing lines), a switch is installed on each of the connections, which is a relatively expensive element of a switchgear.

The purpose of the present invention is to improve the economy by reducing the number of switches.

The goal is achieved if, in addition to the busbar operating system, a busbar shunting system is installed, which is connected to the busbar via a shunt switch and disconnecting device. Each of the outgoing lines, if necessary, switching it through a switch, is connected to the busbar shunt system. In these cases, the shunt switch will play a linear role.

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In the normal operating mode, each of the outgoing lines is connected to the working busbar system without a switch.

For the operations of connecting lines to the working and shunting system of busbars on the branch from the working system and on the branch from the shunt system of busbars after the disconnecting device is additionally introduced through the power contact of the automatic switching device (For example, a high-voltage contactor high voltage circuit breaker with lighter parameters, etc.). These contacts perform the operations of disconnecting and connecting the line to the busbar systems either when the connection at which they are installed does not flow current, or when the current flows through another circuit that shunts this contact formed by another power contact.

The drawing shows a single-line electrical diagram of the primary distribution device in which, for the sake of picture, elements that are not directly related to the invention (current transformers, grounding blades and the like) are not shown. Not also shown is a part of the circuit for the second section of the switchgear, since it is identical to the driven circuit. . The switchgear contains an input device consisting of a switch 1 and a disconnecting device 2, a working busbar system, a shunt busbar system 4 connected to the operating one via a shunt switch 5 with a disconnecting device 2 and outgoing lines (The number of lines in specific cases in the Power Supply Scheme of the consumers ... and may be several tens per substation (the circuit diagram conventionally shows five lines per section). Each of these lines is connected via disconnecting device 2 and power contact 6 of the automatic switching device to the working system of busbars 3 and through disconnecting device 2 and power contact 7 of the automatic switching device to the shunting system of busbars.

In the de-energized state of the circuit, the switches 1, 5 and power contacts b, 7 are disconnected.

Switching on and setting the switchgear under load after turning on pins 2 and switch 1 is performed in the following sequence alternately for each line:

-includes power contact 7,

switch on 5.

The outgoing line is switched on under load, the current goes through the circuit: input - working system of busbars 3 - switch 5 - shunting system of busbars 4 - power contact 7 and further - along the outgoing line to

0 to the consumer.

Next, the operation is performed to release the switch 5.

- power contact 6 is switched on. Now the current flows in two circuits. In addition to

5 of the described circuit also from the working system of busbars 3 to the outgoing line and through pin 6.

- contact 7 is disconnected. The outgoing line is in the normal operating position, switch 5 is released for switching operations with other connections.

For the remaining lines, the turn-on operation is performed in the same sequence with the switch 5 previously turned off.

The disconnection of each single outgoing line from the normal working position occurs in the following sequence from the initial position: switches 1. 5 and contacts 6 of the operating outgoing lines are on, all contacts 7 are off;

-includes power contact 7.

5 The current path follows two chains and is described above.

- contact 6 is turned off;

The current goes from the working system of busbars 3 only through the switch 5 and the contact- 0 step 7;

off switch 5;

Line is completely disabled. Next, the operation is performed to release the switch 5. 5 - contact 7 is turned off.

The outgoing line is completely disconnected; switch 5 is released for switching operations.

Similarly, all other outgoing lines are disconnected.

Claims (1)

Invention Formula A switchgear containing a working busbar system with an input cell connected to it and 5 outgoing lines with disconnecting devices, characterized in that, in order to increase efficiency by reducing the number of switches, it is equipped with a shunt busbar system connected through additionally The inserted shunt switch to the working busbar system, and each of the outgoing lines is equipped with two additional power contacts of the automatic switching devices installed behind the disconnecting devices and connected to the working and shunting busbar systems. L 1 l1 "-A Outgoing lines 7