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ABB all products Example of curve reading

Example of curve reading
t [s]
x I
1
10
10
10
10
2
1
10
10
2
10
3
10
4
1
10
152.7 s
40.2 s
6.9 s
3 x I
1
Example 1 – XT3N 225
Trip curves for distribution (thermal magnetic trip unit)
Let us consider an XT3N TMF In = 225A circuit-breaker. According to the conditions the overload is found in; i.e., with the circuit-breaker at thermal regime or not, thermal protection tripping varies considerably. For example, for an overload current 3xI1, the trip time is between 152,7s and 40,2s for cold tripping and between 40,2s and 6,9s for hot tripping.
4
For fault current values higher than 225A. Tthe circuit-breaker trips with the instantaneous magnetic protection I3.
Example 2 – XT2H 125
Specific let-through energy curves
This figure figure shows a sample graph of the specific let­through energy of the XT2H 125 circuit-breaker at a voltage of 220/230V. The prospective symmetrical short-circuit current is indicated on the abscissas, whereas the values of the specific let-through
2
energy expressed in A The circuit-breaker lets through a value of I 10^6 · A
2
s relative to a short-circuit current of 14kA.
s are shown on the ordinates.
2
t equal to 0, 42 ·
I2t [106 A2s]
10
1
-1
10
-2
10
1
14 kA
10
2
10
3
10
x I
[kA]
rms
4/2 SACE Tmax XT UL/CSA | US Technical Catalog
Ip [kA]
x I
rms
[kA]
10
10
1
1
10
2
10
3
10
2
10
3
18 kA
Example 3 – XT2L 125
Limitation curves
The figure at right gives the trend of the Limitation curves of the XT2L 125 In = 125A circuit-breaker. The effective value of the prospective symmetrical short-circuit current is given on the abscissas of the diagram, whereas the peak value corresponding to the prospective short-circuit current is indicated on the ordinates. For a value current of 22kA, the XT2L 125 circuit breaker with a thermal magnetic trip unit In = 125A limits the peak prospective short-current current to 18kA at a voltage of 600V.
4
US Technical Catalog | SACE Tmax XT UL/CSA 4/3
1
1
1
1
Trip curves with thermal magnetic trip unit
Trip curves for distribution
XT1 125 TMF In=15..30A
t [s]
4
10
3
10
2
10
4
10
1
-1
10
-2
10
-1
10
XT1 125 TMF In=35...50A
t [s]
4
10
3
1SDC21017EF0001_A
In=15A
In=20A
In=25A
In=30A
1
10
2
10 x I
10
2
10
1SDC21017EF0001_B
10
1
-1
10
-2
10
-1
10
1
In=35A
In=40A
In=45A
In=50A
10
2
10
x I
XT1 125 TMF In=60...100A
t [s]
4
10
3
10
2
10
10
1
-1
10
-2
10
-1
10
1
I3=10xIn
XT1 125 TMF In=125A
t [s]
4
10
3
1SDC21017EF0001_C
10
2
10
10
1
-1
10
-2
10
2
10 x I
10
-1
10
1
I3=10xIn
10
1SDC21017EF0001_D
2
10
x I
4/4 SACE Tmax XT UL/CSA | US Technical Catalog
XT2 125 TMF In=15...30A
1
1
1
1
t [s]
4
10
XT2 125 TMF In=35...50A
t [s]
4
10
3
10
2
10
1SDC21018EF0001_A
10
1
-1
10
-2
10
-1
10
1
In=15A
In=20A
In=25A
In=30A
10
2
10 x I
3
10
2
10
10
1SDC21018EF0001_B
4
1
-1
10
-2
10
-1
10
1
In=35A
In=40/50A
10
2
10 x I
XT2 125 TMF In=60...70A
t [s]
4
10
3
10
2
10
10
1
-1
10
-2
10
-1
10
1
I3=10xIn
XT2 125 TMA In=80...100A
t [s]
4
10
3
1SDC21018EF0001_C
10
2
10
10
1
-1
10
-2
10
2
10 x I
10
-1
10
1
I3=5...10xIn
10
1SDC21018EF0001_D
2
10 x I
US Technical Catalog | SACE Tmax XT UL/CSA 4/5
1
1
Trip curves with thermal magnetic trip unit
Trip curves for distribution
XT2 125 TMA In=110...125A
t [s]
4
10
3
10
2
10
4
10
1
-1
10
-2
10
-1
10
1
I3=5...10xIn
XT3 225 TMF In=60..100A
t [s]
4
10
3
1SDC21018EF0001_E
10
2
10 x I
10
2
10
1SDC21020EF0001_A
10
1
-1
10
-2
10
-1
10
I3=10xIn
1
10
2
10 x I
XT3 250 TMF In=110..150A
t [s]
4
10
3
10
2
10
10
1
-1
10
-2
10
-1
10
1
I3=10xIn
XT3 250 TMF In=160..225A
t [s]
4
10
3
1SDC21018EF0001_B
10
2
10 x I
1
10
2
10
1SDC21020EF0001_C
10
1
-1
10
-2
10
-1
10
I3=10xIn
1
10
2
10 x I
1
4/6 SACE Tmax XT UL/CSA | US Technical Catalog
x I
1
XT4 250 TMF In=25...50A
x I
1
x I
1
x I
1
XT4 250 TMF In=60...70A
t [s]
4
10
3
10
2
10
1SDC21021EF0001_A
10
1
In=25A
-1
10
-2
10
-1
10
1
In=30A
In=35A
In=40...50A
10
2
10
t [s]
4
10
3
10
2
10
10
1SDC21021EF0001_B
4
1
-1
10
-2
10
-1
10
1
I3=10xIn
10
2
10
XT4 250 TMF In=80...100A
t [s]
4
10
3
10
2
10
10
1
-1
10
-2
10
-1
10
1
I3=10xIn
XT4 250 TMF In=110...150A
t [s]
4
10
3
1SDC21021EF0001_C
10
2
10
10
2
10
1SDC21021EF0001_C
10
1
-1
10
-2
10
-1
10
1
I3=10xIn
10
2
10
US Technical Catalog | SACE Tmax XT UL/CSA 4/7
t [s]
x I
1
t [s]
x I
1
x I
1
x I
1
Trip curves with thermal magnetic trip unit
Trip curves for distribution
XT4 250 TMF In=160...225A
4
10
3
10
2
10
4
10
1
-1
10
-2
10
-1
10
XT4 250 TMF In=250A
4
10
3
1SDC21021EF0001_E
10
2
10
10
1
-1
I3=10xIn
1
10
2
10
10
I3=10xIn
-2
10
-1
10
1
10
1SDC21021EF0001_F
2
10
XT4 250 TMA In=80...100A
t [s]
4
10
3
10
2
10
10
1
-1
10
-2
10
-1
10
1
I3=5...10xIn
XT4 250 TMA In=110...150A
t [s]
4
10
3
1SDC21021EF0001_G
10
2
10
10
1
-1
10
-2
10
2
10
10
-1
10
1
I3=5...10xIn
10
1SDC21021EF0001_H
2
10
4/8 SACE Tmax XT UL/CSA | US Technical Catalog
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