Reservation Input (Resin) - ABB RELION 670 SERIES Applications Manual

Line distance protection

Hide thumbs Also See for RELION 670 SERIES:

Table of Contents

1MRK 506 369-UUS -

Line distance protection REL670 2.2 ANSI

Application manual

reservation request of other bays (RES_BAYS) will not be activated at selection of

apparatus x.

Reservation input (RESIN)

With the FutureUse parameter set to Bay future use the function can handle bays not yet

installed in the SA system.

Interlocking (3)

The main purpose of switchgear interlocking is:

To avoid the dangerous or damaging operation of switchgear

To enforce restrictions on the operation of the substation for other reasons for

example, load configuration. Examples of the latter are to limit the number of parallel

transformers to a maximum of two or to ensure that energizing is always from one

side, for example, the high voltage side of a transformer.

This section only deals with the first point, and only with restrictions caused by switching

devices other than the one to be controlled. This means that switch interlock, because of

device alarms, is not included in this section.

Disconnectors and grounding switches have a limited switching capacity. Disconnectors

may therefore only operate:

With basically zero current. The circuit is open on one side and has a small extension.

The capacitive current is small (for example, < 5A) and power transformers with

inrush current are not allowed.

To connect or disconnect a parallel circuit carrying load current. The switching

voltage across the open contacts is thus virtually zero, thanks to the parallel circuit

(for example, < 1% of rated voltage). Paralleling of power transformers is not

Grounding switches are allowed to connect and disconnect grounding of isolated points.

Due to capacitive or inductive coupling there may be some voltage (for example < 40%

of rated voltage) before grounding and some current (for example < 100A) after

grounding of a line.

Circuit breakers are usually not interlocked. Closing is only interlocked against running

disconnectors in the same bay, and the bus-coupler opening is interlocked during a busbar