
12
WL Circuit Breaker Selection and Application Guide
Alarm parameters
The metering function includes the following alarm
set-point functions:
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
ANSI device number
Setting range
Possible delay
Current unbalance
46
5 ... 50%
1 ...15 s
Total harmonic distortion - current
81 THDC
0 ... 50%
5 ...15 s
Voltage unbalance
47
5 ... 50%
1 ...15 s
Undervoltage
27
100 ... 1100V
1 ...15 s
Overvoltage
59
200 ... 1200V
1 ...15 s
Total harmonic distortion - voltage
81 THDV
0 ... 50%
5 ...15 s
Direction of phase rotation
47N
Active power in normal direction
32
1 ... 10000kW
1 ...15 s
Active power in reverse direction
32R
1 ... 10000kW
1 ...15 s
Under frequency
81U
40 ... 70 Hz
1 ...15 s
Over frequency
81O
40 ... 70 Hz
1 ...15 s
Alarm function
Setting range
Possible delay
Overcurrent
3 ... 10000A
0 ... 255 s
Overcurrent – ground fault
3 ... 10000A
0 ... 255 s
Overcurrent – N-conductor
3 ... 10000A
0 ... 255 s
Phase unbalance – current
5 ... 50%
0 ... 255 s
Demand – current
3 ... 10000A
0 ... 255 s
Total harmonic distortion – current
0 ... 50%
5 ... 255 s
Undervoltage
100...1200V
0 ... 255 s
Overvoltage
200...1200V
0 ... 255 s
Phase unbalance – voltage
5 ... 50%
0 ... 255 s
Total harmonic distortion – voltage
0 ... 50%
5 ... 255 s
Crest factor
0.01 ... 25.5%
0 ... 255 s
Form factor
0.01 ... 25.5%
0 ... 255 s
Active power in normal direction
1 ... 10000kW
0 ... 255 s
Active power in reverse direction
1 ... 10000kW
0 ... 255 s
Leading power factor
-0.999 ... 1
0 ... 255 s
Lagging power factor
-0.999 ... 1
0 ... 255 s
Demand – active power
1 ... 10000kW
0 ... 255 s
Apparent power
1 ... 10000kVA
0 ... 255 s
Reactive power in normal direction
1 ... 10000kvar
0 ... 255 s
Reactive power in reverse direction
1 ... 10000kvar
0 ... 255 s
Demand – apparent power
1 ... 10000kVA
0 ... 255 s
Demand – reactive power
1 ... 10000kvar
0 ... 255 s
Underfrequency
40 ... 70 Hz
0 ... 255 s
Overfrequency
40 ... 70 Hz
0 ... 255 s
WL Circuit Breaker
Electronic Trip Unit (ETU)
Содержание ETU745
Страница 2: ...Courtesy of NationalSwitchgear com ...
Страница 123: ...Courtesy of NationalSwitchgear com ...