TY P ES I RP, I RC AND I R D
24
I
2
3
L I N E
I 2 3
L I NE
S T A T I
D E V I C E
N U M B E R
C H A R T
67N-DIRECTIONAL
O V E R CU R R E N T GR
O
U
N
D
RELAY
T Y P E
I R D
D I U - U P P E R D I R E C T I O N A L U N I T
0/ L - L O W E R D I R E C T I O N A L U N I T
C O - T I M E -
O V E R C U R R E N T UNIT
I
-
I N S T A N T A N E O U S 0 / C
UNIT
I
/ST- SAT U R A T I N G
TRANSFORMER
FOR INST.
0/C U N I T
I C S - I N DIC AT I N G
CONTACTOR S W I T C H
5 2 - P O W E R C I R C U I T BRE A K E R
a -
A U X I L I A R Y
CONTACT
TC - T R I P C O I L
M A I N
P.T.
A U X .
R
T.
L - - -
\- - - - - - -
-�
WHEN N O T U S E D,
J U M P E R
T E R M I N A L S
4
A N D
5
N E U T R A L O F GROUND
C U R R E N T S O U R C E
6 7 N
10
I
�
S
CO
I
cs
cs
T
I
5 2 o
67N
�
1
/
ST
S E C.
C 0
289B508
Fig.
2 1.
External Schematic of the IRD Relay for Ground Fault Protection.
S T A T I O N
B U S
D E � C E NUMBER
C H A R T
67N-DIRECTIONAL OVERCURRENT
GROUND
RE L AY T Y PE I R C
D -
D I R E C T I O N A L U N I T
CO -
TIME - OV E R C U R R E N T U N I T
I-
I N S T A N T A N E O U S 0/C
UN
I T
liST- SATURATING
T R A N S F O R M E R
F O R
I N S T .
0/C
U N I T
N E U T R A L O F G R O U N D
C U R R E N T S O U R C E
I C S -
INDIC A T I N G CONTACTOR S W I T C H
5 2 - P O W E R C I R C U I T B R E A K E R
a -
A
U
X
I
LI
A R
Y ' C O N TA C T
T C -
T R I P
C O I L
TO
1
/
ST
S E C .
6 7N
3
289B507
Fig.
22.
External Schematic of the I R C Relay for Ground Fault Protection.
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