SU1206872A1 - Device for selecting faulted wire at electric power line with additional wire - Google Patents

Description

The invention relates to electrical engineering and is intended for the implementation of relay protection and system automation of single-circuit AC high voltage transmission lines having an additional wire connected in parallel to one of the phase conductors of the line.

The purpose of the invention is to expand the field of application by detecting a damaged wire over a transmission line with an additional wire.

The drawing shows a block diagram of a device for selecting a damaged power line wire with an additional wire.

The device contains the main driver 1, receiving power from current transformers 2 and voltage 3, additional selector 4 connected to current transformers 5 connected according to the figure eight scheme.

The main voter contains three bodies for detecting the damaged phase (not shown).

The additional voter is made with starting 6 and selective 7 and 8 organs and logic elements I 9 and 10, each of which is connected to the starting body 6 and one of the electoral bodies 7 and 8, as well as to the output phase with the additional wire of the main voter 1 ,

The triggering organ is made in the form of a relay - current, and the electoral bodies 7 and 8 - in the form of a power relay.

When single wires are damaged (for example, in a single-phase short circuit to earth), primary voter 1 is activated and the damaged wire is disconnected.

2068722

When the non-earth closures and two-phase earth closures of the phases with single wires do not work, the primary voter 1, but

5 it works when one of the parallel wires is closed, as well as when these wires are double-circuited to earth.

With the appearance of a short circuit

 The NIN on one of the phase wires with an additional wire m triggers the triggering body 6 and sends a signal to the electoral bodies 7 or B additional voters 4, the electoral bodies 7 and 8 are the power direction bodies to which the double voltage is applied. wire. Information from the primary voter 1 and from the electoral authorities 7 and 8 of the additional voter 4 is received in blocks I-9 and 10 of the logical summation. At the output of each of these elements, a pulse is formed to control one of the phase conductors with an additional wire. At the output of one of them, a signal is generated to disconnect the damaged wire 2B, at the output of the other - a signal

30 to disconnect the wire, while also forming signals to the automatic control of the switches of the additional wire, which acts when one of the wires is damaged.

D2 With the simultaneous appearance of signals from the electoral bodies of both voters (an additional 7 or 8. and the main one, and when the dual wires are doubled to ground

4Q 2B and 1 additional selector 4 does not work, because the trigger body 6 does not work. In this mode, the automatic control of the switches of the additional wire acts 4; should not.

A 8 C

To automation unit

Claims (1)

A DEVICE FOR SELECTING A DAMAGED WIRING ON THE ELECTRIC TRANSMISSION LINE WITH AN EXTRA WIRE, containing a main selector of three organs for detecting a damaged phase, each of which is connected to current and voltage transformers of a power line, characterized in that, in order to expand the scope by detecting a damaged wire along the line power lines with an additional wire, two current transformers installed on the main and additional wires, an additional selector are additionally introduced consisting of a starting element in the form of a current relay, two selective organs in the form of a power relay and two And elements, the secondary windings of additionally introduced current transformers included in the current difference and connected to the current inputs of the starting and selective organs, the voltage circuits of the electoral organs connected to the transformer voltage connected to the main and auxiliary wires, the first inputs of the first and second elements And are connected to the output of the starting body, the second inputs to the outputs of the corresponding enforcement agencies, third inputs - outputs to identify the faulty phase bodies are connected to current transformers and voltage main and supplementary conductors, and the outputs of AND gates are used to connect to the unit automatic control switches additional conductor.