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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 140:
Delays inversely proportional to the square of the overexcitation
The critical value of excitation M is determined 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 91)
Section 9
1MRK 502 048-UUS A
Voltage protection
306
Technical manual
Summary of Contents for 650 series
Page 1: ...Relion 650 series Generator protection REG650 ANSI Technical manual ...
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Page 62: ...56 ...
Page 68: ...62 ...
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