Rockwell Automation 865 Differential Protection Relay - Manual (Page 102)

4-10 Supporting
Functions
865-UM001A-EN-P – July 2009
Equation
4.4
C
C
AlarmMax = Δ
3
313
945
2 1
= = Δ = Δ
L L
Thus Alarm2 counters for phases L1 and L2 are decremented by 3.
In phase L1 the currents is less than the alarm limit current 6 kA. For
such currents the decrement is one.
1
3
= Δ
L
Table 4.8 – Local Panel Parameters of CBWEAR Function
Parameter Value Unit Description Set
CBWEAR STATUS
Al1L1
Al1L2
Al1L3
Al2L1
Al2L2
Al2L3
Operations left for
- Alarm 1, phase L1
- Alarm 1, phase L2
- Alarm 1, phase L3
- Alarm 2, phase L1
- Alarm 2, phase L2
- Alarm 2, phase L3
Latest trip
Date
time
Time stamp of the latest trip
operation
IL1
IL2
IL3 A
A
A
Broken current of phase L1
Broken current of phase L2
Broken current of phase L3
CBWEAR SET
Alarm1
Current 0.00 – 100.00 kA Alarm1 current level Set
Cycles 100000 – 1 Alarm1 limit for operations left Set
Alarm2
Current 0.00 – 100.00 kA Alarm2 current level Set
Cycles 100000 – 1 Alarm2 limit for operations left Set
CBWEAR SET2
Al1On On
Off
'Alarm1 on' event enabling Set
Al1Off On
Off
'Alarm1 off' event enabling Set
Al2On On
Off
'Alarm2 on' event enabling Set
Al2Off On
Off
'Alarm2 off' event enabling Set
Clear –
Clear
Clearing of cycle counters Set
Set = An editable parameter (password needed)
The breaker curve table is edited with SetPointPS.