CHAPTER 5: SETTINGS
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
5–53
The 469 takes the information provided and create protection curves for any voltage
between the minimum and 100%. For values above the voltage in question, the 469
extrapolates the safe stall protection curve to 110% voltage. This current level is calculated
by taking the locked rotor current at 100% voltage and multiplying by 1.10. For trip times
above the 110% voltage level, the trip time of 110% will be used (see figure below).
FIGURE 5–11: Voltage Dependent Overload Protection Curves
NOTE
Note
The safe stall curve is in reality a series of safe stall points for different voltages. For a given
voltage, there can only be one value of stall current and therefore, only one safe stall time.
1
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
9
10
20
30
40
50
60
7
0
80
9
0
100
HIGH INERTIA LOAD OVERLOAD CURVES
8800 HP, 13.2 kV, REACTOR COOLANT PUMP
TIME
T
O
TRIP
(SECONDS)
MULTIPLES OF FULL LOAD AMPS
200
300
400
500
600
7
00
800
9
00
1000
A
cce
l
erat
i
on
I
ntersect at
80%
V
C
ustom
C
urve
A
cce
l
erat
i
on
I
ntersect at
100%
V
Safe Sta
ll
T
i
me at
80%
V
,
80%
V Sta
ll C
urrent
Safe Sta
ll
T
i
me at
100%
V
,
100%
V Sta
ll C
urrent
Safe Sta
ll
Po
i
nts
Ex
trapo
l
ated to
110%
V
806824A4.CDR
GE Multilin
Содержание Masoneilan 469 Series
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Страница 300: ...7 2 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 7 TESTING FIGURE 7 1 Secondary Injection Test Setup ...
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