GE Industrial Solutions EntelliGuard TU Trip Units - Manual (Page 20)

EntelliGuard TU Trip Units: UL/ANSI Models DEH-4567B
Protection
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Table 2-3: Short Time Commit Times
Time Band
60 Hz
ANSI, UL489
50 Hz
ANSI, UL489
1 0.025 sec 0.030 sec
2 0.033 sec 0.040 sec
3 0.042 sec 0.050 sec
4 0.058 sec 0.060 sec
5 0.092 sec 0.090 sec
6 0.117 sec 0.120 sec
7 0.158 sec 0.160 sec
8 0.183 sec 0.180 sec
9 0.217 sec 0.220 sec
10 0.350 sec 0.350 sec
11 0.417 sec 0.420 sec
12 0.517 sec 0.520 sec
13 0.617 sec 0.620 sec
14 0.717 sec 0.720 sec
15 0.817 sec 0.820 sec
16 0.917 sec 0.920 sec
17 0.933 sec 0.940 sec
Table 2-4: Short Time Settings by Breaker Type and
Frame
Breaker Available Settings
Power Break I, Power
Break II, WavePro, AKR
conversion kits OFF, 1.5 to 9, steps of 0.5
AKR and WavePro 5000A
frame OFF, 1.5 to 7, steps of 0.5
EntelliGuard G Frame 1
and 2 OFF, 1.5 to 12, steps of 0.5
EntelliGuard G Frame 3 OFF, 1.5 to 10, steps of 0.5
Short Time Delay
The Short Time Delay setting consists of both a slope
setting and a fixed delay band setting. The slope and delay
are independently selectable. The slope setting consists of
three I
2 T slopes (minimum (1), intermediate (2) and
maximum (3)) and fixed delay. The fixed delay bands
consist of 11 constant time bands. The width of the bands
varies by circuit breaker and with frequency. See Table 2-4.
On all ANSI and IEC breakers, the Short Time can be
disabled by setting the Short Time Delay to “OFF”. Note that
if Instantaneous is set to “OFF” Short Time cannot be
turned off.
Figure 2-4: Short Time Delay
Short Time Slope
The slope setting modifies the initial portion of the ST delay
band in the familiar “hockey stick” configuration. A setting
of OFF puts the constant time band in effect, with no slope.
Slope settings of 1, 2, or 3 put progressively higher slope
values in effect. If the fault exceeds the sloped section of
the curve, the constant time band setting takes effect.
Table 2-5: Short Time Delay Settings
Band Time Delay
Band Setting
Commit Time EntelliGuard G
50 Hz 60 Hz Clear
Time
60 Hz
Clear
Time
50 Hz
1 Min. 0.030 0.025 0.080 0.085
2 2nd 0.040 0.033 0.088 0.093
3 3rd 0.050 0.042 0.097 0.102
4 4th 0.060 0.058 0.113 0.118
5 5th 0.110 0.092 0.147 0.152
6 6th 0.130 0.117 0.172 0.177
7 7th 0.180 0.158 0.213 0.218
8 8th 0.210 0.183 0.238 0.243
9 9th 0.240 0.217 0.272 0.277
10 10th 0.280 0.350 0.405 0.410
11 Max. 0.340 0.417 0.472 0.477
• Short Time slope is forced to OFF when optional LT Fuse (i 4 t) curves are
in use.
Slope OFF
Slope = 3
Slope = 1