TYP E S I RP , I RC, AND I R D R ELAYS
20
en
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0
u
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en
...J
...J
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(/)
c
z
0
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0
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60
4 8
36
t= 24
1 2
0
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DIRECTIONAL U N IT CLOSING TIMES
( A ) CUR RENT VOLTABE ,
( B )
I VOLT VOLTAGE POLA R I ZED
DIR ECTIONAL U N I T OPENING
CURRE NT, VOLTAGE , POLARIZED
FOR POTENTIAL POLARI Z ED
MPP : EPOL lop COS
(9 -60°)
FOR CURRENT POLAR IZED
MPP - I POL iopCOS ( � - 1'0?
.25
�
WHERE
--
Dl RECTI ONAL UN ITS
T Y P I CAL OPERAT I NG T I M E
(
FOR T W O ELEMENT DUAL
)
POL A R I ZE D RELAY
MPP = MULTIPLES OF PRODUCT PICKUP
EpoL= POLARIZ ING VOLTAGE
IpQL =POLARIZING CURRENT
Iop = OPERATING CURRENT
9
=-ANGLE
BY
WHICH Io LAGS EP
·CI
=ANGLE
BY
WHICH
I0
LlAOSi p
* • DIVIDE BY 4 FOR 4 · 1 2 AU P RANGE
� •DIVIDE BY I FOR 4·12AMP RANGE
4
5 6 7 8
9
10
20
30
40 50 60
80 100
200
300 400
600 800 1000
2000
MULT I P L E S OF PRODU C T P I C K U P
Curve
*
Fig. 1 7. Typi cal Op eratin g Times For The D i rection al Un i t.
I N STANTA N E OU S O V E RCURRENT UNIT
T Y P I C AL
C L O S I N G
TIME
(
FOR
T W O E L E MENT D U A L
)
P O L A R I Z E D
RELAY
2
3
4
6 7 8 9 10
20
30
M U L T I PLES
OF
P I C K U P
Fig. 18. Typi cal Op eratin g Times For The I n stan tan eou s O vercu rrent Un it.
40 50
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