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The Type
IBCG
the protection of feeders and transmission lines.
inverse, very inverse or extremely inverse time characteristics.
All the
IBCG
an instantaneous directional unit of the induction cup type. The-directional unit can
be potential polarized, or current polarized, or both, and it directionally controls
the operation of the time overcurrent unit.
A'target seal-in unit is provided in each of the relays. The operating coil for
this unit is connected in series with the contacts of the time overcurrent unit so that
it will pick up whenever the time overcurrent unit operates. The contacts of the seal-
in unit are connected in parallel with the contacts of the time overcurrent unit to
provide protection for them and their associated control springs.
Those relays having the designation
Hi-Seismic instantaneous overcurrent unit of the hinged armature construction.
*
The
53M and the 77M relay models respectively.
All the
IBCG
panel drilling dimensions for which
l
relays are given in Fig. 5, 6, 7, 8 and 9.
Fig.
and 12.
10, 11
Table
lists the various models and ranges that are available.
1
*Indicates Revision
GROUND DIRECTIONAL OVERCURRENT RELAYS
relays are ground directional overcurrent relays used primarily for
relays contain a time overcurrent unit of the induction disk type and
54M and the 78M relay models are the two contact versions of the
relays are mounted in standard
DESCRIPTION
They are available with either
following the model number also contain a
size drawout cases; the outline and
Ml
given in Fig.
are
26. Internal
Typical external connections-are shown by
3
connections for the
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