KRB-5368c
-26-
Protection characteristic
Note 1: The operating time (t) at a long time delay, N-phase
protection or Pre-trip alarm pickup current setting is
given by
Long time delay
t
= -27.94
×
t
R
×
log
e
{ 1 - ( 1.125
I
R
i
)
2
} ±20% +0.15 –0 [sec]
I
R
= Long time delay pickup current setting,
i
= Overcurrent,
t
R
= Time setting
N-phase protection
t
= -27.94
×
t
N
×
log
e
{ 1 - ( 1.125
I
N
i
)
2
} ±20% +0.15 –0 [sec]
I
N
= N-phase protection pickup current setting,
i
= Overcurrent,
t
N
= Time setting
Pre-trip alarm
t
= -27.94
×
t
P
×
log
e
{ 1 - ( 1.125
I
P
i
)
2
} ±20% +0.1 –0 [sec]
I
P
= Pre-trip alarm pickup current setting,
i
= Overcurrent,
t
P
= Time setting
Fig. 19 Characteristic curves of type AGR-12BL OCR (with L characteristic)
Содержание TemPower2 AR-E Series
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