Alarm Parameters; Extended Relaying - Siemens ETU745 Application Manual

WL Circuit Breaker
Electronic Trip Unit (ETU)

Alarm parameters

The metering function includes the following alarm
set-point functions:
Alarm function
Overcurrent
Overcurrent – ground fault
Overcurrent – N-conductor
Phase unbalance – current
Demand – current
Total harmonic distortion – current
Undervoltage
Overvoltage
Phase unbalance – voltage
Total harmonic distortion – voltage
Crest factor
Form factor
Active power in normal direction
Active power in reverse direction
Leading power factor
Lagging power factor
Demand – active power
Apparent power
Reactive power in normal direction
Reactive power in reverse direction
Demand – apparent power
Demand – reactive power
Underfrequency
Overfrequency

Extended relaying

Protective relays included with the metering function can
monitor the following criteria and initiate a trip if the values
are exceeded.
Protective relay function
Current unbalance
Total harmonic distortion - current
Voltage unbalance
Undervoltage
Overvoltage
Total harmonic distortion - voltage
Direction of phase rotation
Active power in normal direction
Active power in reverse direction
Under frequency
Over frequency
12
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Setting range
3 ... 10000A
3 ... 10000A
3 ... 10000A
5 ... 50%
3 ... 10000A
0 ... 50%
100...1200V
200...1200V
5 ... 50%
0 ... 50%
0.01 ... 25.5%
0.01 ... 25.5%
1 ... 10000kW
1 ... 10000kW
-0.999 ... 1
-0.999 ... 1
1 ... 10000kW
1 ... 10000kVA
1 ... 10000kvar
1 ... 10000kvar
1 ... 10000kVA
1 ... 10000kvar
40 ... 70 Hz
40 ... 70 Hz
ANSI device number
46
81 THDC
47
27
59
81 THDV
47N
32
32R
81U
81O
Possible delay
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
5 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
5 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
0 ... 255 s
Setting range
5 ... 50%
0 ... 50%
5 ... 50%
100 ... 1100V
200 ... 1200V
0 ... 50%
1 ... 10000kW
1 ... 10000kW
40 ... 70 Hz
40 ... 70 Hz
WL Circuit Breaker Selection and Application Guide
Possible delay
1 ...15 s
5 ...15 s
1 ...15 s
1 ...15 s
1 ...15 s
5 ...15 s
1 ...15 s
1 ...15 s
1 ...15 s
1 ...15 s