Description; Application - GE ICW51A Instructions Manual

...-
o
I
U)
Sl
(")
«
00
::t-
o
POWER
TYPE
DESCRIPTION
The several types of ICW Relays covered by this
instruction book are single phase, time delay, power
directional relays in size S1 drawout cases for use
on 3-phase power systems. In general these relays
are designed for operation at rated system voltage to
detect an abnormal power flow in a given direction.
For balanced load conditions only one relay is re-
quired per terminal. The different types of relays
are listed in the following table:
Relay
Application Contacts
Target
Type Seal-In
ICW51A Overpower 1-Normally Open
Yes
ICW52A Over & 1-Normally Open No
Underpower 1-Normally Closed
ICW52B Overpower 2-Normally Open Yes
The available ranges and ratings are given in this
book under the section on RATINGS.
APPLICATION
ICW51A AND ICW52B RELAYS
The ICW51A and ICW52B relays are applied on
3-phase systems where time delay over-power or
reverse-power protection is required for electrical
equipments and circuits. These relays are not in-
tended for use as fault protective relays.
PHASE SEQUENCE 1-2-3
RELAYS
lew
Specifically, both of these relays are very well
suited for the protection of generators against motor-
ing on loss of input energy to the prime mover.
Since the relays are calibrated in 3-phase watts,
if
the balanced 3-phase motoring energy in secondary
watts taken by the generator exceeds the pick-up
setting of the relay
it
will operate. In general the
relays will be suitable for application on all gas
turbines, all reciprocating engines, some hydraulic
turbines and some small steam turbine generators.
However, calculations should always be made to
check the application and select the proper relay
range. See the section on CALCULATIONS OF
SETTINGS for a worked example.
If
a more sensitive
device is required the Type GGP relay should be
used.
Only one ICW51A or one ICW52B is required
per terminal for balanced 3-phase systems but three
can be used for unbalanced conditions. The external
connections for these relays are illustrated in Fig. 1.
ICW52A RELAY
The ICW52A relay is applied on equipment and
circuits where over-and/or under-power supervision
is required. It is not intended for use as a fault
protective relay. This relay is calibrated in 3-phase
watts and only one relay is required per terminal
for balanced 3-phase systems, but three can be
used for unbalanced conditions if desired. Since the
-r----~--~------------~~_r--~--1
-r--~~--------.-------~~~------2
A-c
CONNE~CT~I~O~-:-S""""----------+-------"""'--1-------
3
COR ICW51A, ICw-41 ICW-43
~
Nnk8ALANCED CONDITIONS
I CW52A
& J -
I USE ONLY
~1.'2
OR
~3
RELAY
1CW528
' > ---
I 7 b
v---,
7 •
1
/ "
ICW-~2
- j
\-----'1r7
8
- - - '
(+ )
5 6
I CW-¢2
E ~1
10
~
1CW51A
3 1 1
.......
- - -
D-( C I RCU I T5 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ /
---" ,,_(-_) _ _ ICW528 -------" ' - - ICW52A---"
Fi g. I
External Connection Diagrams For ICI'I'5IA, 52A And 52B Power Kel..;ys
These instructions do not purport to cover all details or variations in equipment nor to provide for
every possible contingency to be met in connection with installation, operation or maintenance. Should
further information be desired or should particular problems arise which are not covered sufficiently for
the purchaser's purposes, the matter should be referred to the General Electric Company.
To the extent required the products described herein meet applicable ANSI, IEEE and NEMA standards;
but no such assurance is given with respect to local codes and ordinances because they vary greatly.
3