6–61
Testing – 6
Slope Test
:
1.
Define a representative number of testing points to verify the trip curve.
2.
For each I
a
(Current Input 1) test point defined in Step 1, calculate the expected operating current
I
A
(Current Input 2) as follows:
(I
A
-I
a
)
> (I
A
+I
a
)
x Slope/100
÷
2
Difference in currents
is greater than sum of the currents times the per unit slope ÷2
or
I
A
= [(1+K) ÷ (1-K)]
x
I
a
where
K
=
S
/200 and where
S
is % slope input above.
NOTE:
For tests above the restraint current {(I
A
+I
a
)/2} value of 2X Nominal Current; use a slope % value
equal to 4 times the input slope value (S) for these computations.
3.
Set Current Input 1 (I
a
) and Current Input 2 (I
A
) to the values chosen in Step 1 and calculated in Step
2 respectively.
4.
Press and hold the
TARGET RESET
pushbutton, then slowly increase either Current Input 1 or 2
until the
PHASE DIFF CURRENT 87
LED illuminates, or the function status indicator on the
Monitor
Function Status
screen indicates that the function has picked up.
The current level of operation will be equal to I
A
±0.1 A or
±2% slope calculation. The difference in
current must be greater than minimum pickup current for proper operation.
5.
Release the
TARGET RESET
pushbutton, then decrease the larger
CURRENT
. The
OUTPUT
LED(s) will extinguish.
6. Press
TARGET RESET
pushbutton to reset targets.
Summary of Contents for M-3425A
Page 1: ...Instruction Book M 3425A Generator Protection ...
Page 38: ...This Page Left Intentionally Blank ...
Page 43: ...This Page Left Intentionally Blank ...
Page 57: ...xiv M 3425A Instruction Book This Page Left Intentionally Blank ...
Page 63: ...M 3425A Instruction Book 1 6 This Page Left Intentionally Blank ...
Page 95: ...M 3425A Instruction Book 2 32 This Page Left Intentionally Blank ...
Page 97: ...M 3425A Instruction Book 3 2 Figure 3 2 IPScom Main Screen ...
Page 123: ...M 3425A Instruction Book 3 28 Figure 3 30 View Sequence of Events Recorder Screen ...
Page 131: ...M 3425A Instruction Book 3 36 This Page Left Intentionally Blank ...
Page 162: ...4 31 System Setup and Setpoints 4 Figure 4 15 IPScom Relay Setup System Dialog Screen ...
Page 183: ...4 52 M 3425A Instruction Book Figure 4 32 Volts Per Hertz 24 Setpoint Ranges ...
Page 187: ...4 56 M 3425A Instruction Book Figure 4 34 Sync Check 25 Setpoint Ranges ...
Page 202: ...4 71 System Setup and Setpoints 4 Figure 4 50 49 Function Overload Curves ...
Page 203: ...4 72 M 3425A Instruction Book Figure 4 51 Stator Thermal Protection 49 Setpoint Ranges ...
Page 215: ...4 84 M 3425A Instruction Book Figure 4 62 Phase Overvoltage 59 Setpoint Ranges ...
Page 239: ...4 108 M 3425A Instruction Book Figure 4 80 Out of Step 78 Setpoint Ranges ...
Page 242: ...4 111 System Setup and Setpoints 4 Figure 4 82 Frequency 81 Setpoint Ranges ...
Page 261: ...M 3425A Instruction Book 5 6 Figure 5 5 Mounting Dimensions for GE L 2 Cabinet H3 and H4 ...
Page 277: ...M 3425A Instruction Book 5 22 Figure 5 14 M 3425A Circuit Board ...
Page 278: ...Installation 5 5 23 Figure 5 15 M 3425A Circuit Board Expanded I O ...
Page 280: ...Installation 5 5 25 Figure 5 17 20 Hz Frequency Generator Housing Panel Surface Mount ...
Page 281: ...M 3425A Instruction Book 5 26 Figure 5 18 20 Hz Frequency Generator Housing Panel Flush Mount ...
Page 282: ...Installation 5 5 27 Figure 5 19 20 Hz Band Pass Filter Housing Panel Surface Mount ...
Page 283: ...M 3425A Instruction Book 5 28 Figure 5 20 20 Hz Band Pass Filter Housing Panel Flush Mount ...
Page 284: ...Installation 5 5 29 Figure 5 21 20 Hz Measuring Current Transformer 400 5 A CT ...
Page 421: ...D 2 M 3425A Instruction Book Figure D 1 Volts Hz 24 Inverse Curve Family 1 Inverse Square ...
Page 422: ...Inverse Time Curves Appendix D D 3 Figure D 2 Volts Hz 24 Inverse Family Curve 2 ...
Page 423: ...D 4 M 3425A Instruction Book Figure D 3 Volts Hz 24IT Inverse Curve Family 3 ...
Page 424: ...Inverse Time Curves Appendix D D 5 Figure D 4 Volts Hz 24IT Inverse Curve Family 4 ...
Page 427: ...D 8 M 3425A Instruction Book Figure D 5 BECO Definite Time Overcurrent Curve ...
Page 428: ...Inverse Time Curves Appendix D D 9 Figure D 6 BECO Inverse Time Overcurrent Curve ...
Page 429: ...D 10 M 3425A Instruction Book Figure D 7 BECO Very Inverse Time Overcurrent Curve ...
Page 430: ...Inverse Time Curves Appendix D D 11 Figure D 8 BECO Extremely Inverse Time Overcurrent Curve ...
Page 437: ...D 18 M 3425A Instruction Book Figure D 15 IEEE Extremely Inverse Time Overcurrent Curves ...
Page 469: ...F 30 M 3425A Instruction Book This Page Left Intentionally Blank ...
Page 479: ...H 2 M 3425A Instruction Book This Page Left Intentionally Blank ...