
1
10
1
10
100
1000
2
40
3
4
5
20
30
TD = 2
TD = 3
TD = 4
TD = 5
TD = 6
TD = 7
TD = 8
TD = 9
TD = 10
TD = 1
OVEREXCITATION IN %
Time (s)
IEEE OVEREXCITATION CURVES
en01000373_ansi.vsd
(M-Emaxcont)*100)
TD = 60
TD = 20
ANSI01000373 V1 EN
Figure 273:
Delays inversely proportional to the square of the overexcitation
The critical value of excitation M is determined indirectly via OEXPVPH (24) setting
Pickup2
.
Pickup2
can be thought of as a no-load voltage at rated frequency, where the
inverse law should be replaced by a short definite delay,
t_MinTripDelay
. If, for
example,
Pickup2
= 140 %, then M is according to equation
.
(
)
Pickup2 f
M
1.40
Vn/fn
=
=
ANSIEQUATION2286 V1 EN
(Equation 144)
The
Tailor-Made
law allows a user to design an arbitrary delay characteristic. In this
case the interval between M =
Pickup1
, and M = Mmax is automatically divided into
Section 8
1MRK505222-UUS C
Voltage protection
536
Technical reference manual
Содержание Relion 670 series
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