GE EntelliGuard G Application Manual page 27

Section 3. EntelliGuard TU Trip Unit System
Figure 3.13
Long Time "Thermal Type" Delay Bands.
.5 .6 .7 .8 .9 1 2 3
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Minimum C
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Courtesy of NationalSwitchgear.com
MULTIPLE OF LONG-TIME PICKUP
4 5 6 7 8 9 10 20 30 40
X =
Curve
Min CB
C-2
C-3
C-4
C-5
C-6
C-7
C-8
C-9
C-10
C-11
C-12
C-13
C-14
C-15
C-16
C-17
Maximum C
C-18
C-19
C-20
C-21
Max CB
Algorithm will not commit below 1.5 cycles, clearing time will not be less than 0.08 seconds.
Maximum LT curve is 15XLTPU for envelope 1 and 2 devices, 10XLTPU for Envelope 3 devices.
C-13
Actual Long Time pickup is 112% of nominal pickup.
C-6
C-3
Transition to Short-Time Pickup,
Short- Time Delay Band or Instantaneous
4 5 6 7 8 9 10 20 30 40
MULTIPLE OF LONG-TIME PICKUP
50 60 70 80 90
Nominal Clearing and Commit Times for X Multipliers of Nominal Pickup.
1.5 1.5 6 6 7.2
Commit Clear Commit Clear Commit
4.25 8.04 0.20 0.33 0.14
12.7 24.1 0.60 0.94 0.42
25.5 48.1 1.21 1.84 0.83
34.0 64.1 1.61 2.45 1.11
51.0 96.2 2.41 3.66 1.67
67.9 128 3.21 4.87 2.22
84.9 160 4.02 6.08 2.78
101.9 192 4.82 7.29 3.33
118.9 224 5.62 8.49 3.89
135.9 256 6.43 9.70 4.44
152.9 289 7.23 10.9 5.00
169.8 321 8.04 12.1 5.56
203.8 385 9.64 14.5 6.67
237.8 449 11.2 17.0 7.78
271.7 513 12.9 19.4 8.89
305.7 577 14.5 21.8 10.0
339.7 641 16.1 24.2 11.1
373.6 705 17.7 26.6 12.2
407.6 769 19.3 29.1 13.3
441.6 833 20.9 31.5 14.4
475.5 898 22.5 33.9 15.6
509.5 962 24.1 36.3 16.7
Determines End of Curve
50 60 70 8090
7.2 10 10 15 15
Clear Commit Clear Commit Clear
0.24 0.072 0.137 0.032 0.077
0.66 0.21 0.35 0.095 0.17
1.28 0.43 0.67 0.19 0.31
1.70 0.57 0.89 0.25 0.41
2.53 0.86 1.32 0.38 0.60
3.37 1.15 1.75 0.51 0.79
4.20 1.43 2.18 0.63 0.98
5.03 1.72 2.61 0.76 1.17
5.87 2.01 3.03 0.89 1.36
6.70 2.29 3.46 1.02 1.55
7.54 2.58 3.89 1.14 1.74
8.37 2.87 4.32 1.27 1.93
10.0 3.44 5.18 1.52 2.31
11.7 4.01 6.04 1.78 2.69
13.4 4.59 6.90 2.03 3.07
15.0 5.16 7.76 2.29 3.45
16.7 5.73 8.61 2.54 3.83
18.4 6.30 9.47 2.79 4.21
20.0 6.88 10.3 3.05 4.59
21.7 7.45 11.2 3.30 4.97
23.4 8.02 12.0 3.56 5.35
25.1 8.60 12.9 3.81 5.73
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