Communication-capable Circuit Breakers
2/17
Table 2-9
Alarm and setpoint functions allow events to be generated when system conditions deviate from their nominal values. The generation of the
events can be delayed to prevent transient conditions from “chattering.” These alarms are communicated via
Cubicle
BUS
and can cause output contacts
to close in the configurable output module and can freeze the waveform buffer in the metering function. Alarms are communicated to the COM15
where they can be transmitted to the master.
The extended protective relay functions of the metering function can monitor the following criteria and initiate a trip
if values are exceeded.
Protective Relay Function
ANSI Device Number
Setting range
Possible delay
Current unbalance
46
5 ... 50%
0 ...15 s
Total harmonic distortion - current
81THDC
5 ... 50%
5 ...15 s
Voltage unbalance
47
5 ... 50%
0 ...15 s
Undervoltage
27
100 ... 1100V
0 ...15 s
Overvoltage
59
200 ... 1200V
0 ...15 s
Total harmonic distortion - voltage
81THDV
5 ... 50%
5 ...15 s
Direction of phase rotation
47N
-
-
Active power in normal direction
32
13 ... 4000kW
0 ...15 s
Active power in reverse direction
32R
13 ... 4000kW
0 ...15 s
Under frequency
81U
40 ... 70 Hz
0 ...15 s
Over frequency
81O
40 ... 70 Hz
0 ...15 s
The metering function supplies the following Alarm Setpoint Functions:
Alarm Function
Setting range
Possible delay
Over current
30 ... 10000A
0 ... 255 s
Over current - ground fault
30 ... 10000A
0 ... 255 s
Over current - N-conductor
30 ... 10000A
0 ... 255 s
Phase unbalance - current
5 ... 50%
0 ... 255 s
Demand - current
30 ... 10000A
0 ... 255 s
Total harmonic distortion - current
5 ... 50%
5 ... 255 s
Undervoltage
15 ... 1200V
0 ... 255 s
Overvoltage
200 ... 1200V
0 ... 255 s
Phase unbalance - voltage
5 ... 50%
0 ... 255 s
Total harmonic distortion - voltage
5 ... 50%
5 ... 255 s
Crest factor
1 ... 3,000
0 ... 255 s
Form factor
1 ... 3,000
0 ... 255 s
Active power in normal direction
13 ... 10000kW
0 ... 255 s
Active power in reverse direction
13 ... 10000kW
0 ... 255 s
Leading power factor
0 ... -0.99
0 ... 255 s
Lagging power factor
0 ... 0.99
0 ... 255 s
Demand - active power
-10000 ... 10000kW
0 ... 255 s
Apparent power
13 ... 10000kVA
0 ... 255 s
Reactive power in normal direction
13 ... 10000kvar
0 ... 255 s
Reactive power in reverse direction
13 ... 10000kvar
0 ... 255 s
Demand - apparent power
13 ... 10000kVA
0 ... 255 s
Demand - reactive power
13 ... 10000kvar
0 ... 255 s
Underfrequency
40 ... 70 Hz
0 ... 255 s
Overfrequency
40 ... 70 Hz
0 ... 255 s
Table 2-8
Additional trip criteria can be set using the extended protective relay functions. A delay time can be set to prevent transient events from
causing nuisance trips: the circuit breaker will not trip unless the condition is present for longer than the delay time.
WL Circuit Breaker
WL PROFIBUS Communication and Electronic Accessories • July 2004