E −
28
< Example for ETR characteristics setting >
For setting calculation, take AE1600-SW 1600A WS1G1 relay for example.
Current settings and operating times are calculated.
In
Ir
Iu
T
L
Isd
Tsd
Ii
Ip
Ig
Tg
= Rated current (CT rating)
= Rated current setting
= Uninterrupted current
(non-breaking current)
= Long time delay pick-up current
= Short time delay pick-up current
= Short time delay tripping time
= Instantaneous pick-up current
= Pre-alarm pick-up current
= Ground fault pick-up current
= Ground fault operating time
Ir=0.8
✕
In
=0.8
✕
1600A
=1280A
Iu=0.9
✕
Ir
=0.9
✕
1280A
=1152A
Isd=3
✕
Ir
=3
✕
1280A
=3840A
Ig=0.1
✕
In
=0.1
✕
1600A
=160A
Ip=0.8
✕
Iu
=0.8
✕
1152A
=921.6A
In=1600A
Ii=12
✕
Ir
=12
✕
1280A
=15360A
T
L
=100 sec.
Operating time at
current twice as high
as lu, 1152
✕
2=2304A
Tsd=0.3 sec.
Operating time at current
1.5 times as high as Isd,
3480
✕
1.5=5760A
Tg=0.8 sec.
Operating time at current
1.5 times as high as Ig,
160
✕
1.5=240A
Tp=
1 2
T
L
For
1
2
of T
L
at 2304A:
100
✕
0.5=50 sec.
Fig. 28-1
Table 28-1 Calculated current and operating time
In (CT rating)
Ir
Iu
T
L
Isd
Tsd
=1600A
=1280A
=1152A
=100sec.
±
20% (at 2304A)
=3840A
±
15%
=0.3sec.
±
20% (at 5760A)
Ii
Ip
Tp
Ig
Tg
=15360A
±
15%
=921.6A
±
10%
=50sec.
±
20% (at 2304A)
=160A
±
20%
=0.8sec. (at 240A)
±
20%
—
Содержание AE-SW Series
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