Micom P341 - Page 17

Update Documentation P341/EN AD/F43
MiCOM P341 (AD) -13
Overfrequency
Accuracy
Pick-up: Setting 0.01Hz
Drop-off: (Setting -0.025Hz) 0.01Hz
DT operation: 2% or 50ms whichever is
greater *
* The operating will also include a time for
the relay to frequency track 20Hz/ second).
CB Fail
Timer Accuracy
Timers: 2% or 40ms whichever is greater
Reset time: <30ms
Undercurrent Accuracy
Pick-up: 10% or 25mA whichever is greater
Operating time: < 12ms (Typical <10ms)
Reset: < 15ms (Typical < 10ms)
Supervisory Functions
Voltage Transformer Supervision
Accuracy
Fast block operation: <25ms
Fast block reset: <30ms
Time delay: Setting 2% or 20ms whichever is
greater
Current Transformer Supervision
Accuracy
IN > Pick-up: Setting 5%
VN < Pick-up: Setting 5%
IN > Drop-off: 0.9 x Setting 5%
VN < Drop-off: (1.05 x Setting) 5% or 1V
whichever is greater
CTS block operation: < 1 cycle
CTS reset: < 35ms
Plant Supervision
CB State Monitoring Control and
Condition Monitoring
Accuracy
Timers: 2% or 20ms whichever is greater
Broken current accuracy: 5%
Programmable Scheme Logic
Accuracy
Output conditioner timer: Setting 2% or 50ms
whichever is greater
Dwell conditioner timer: Setting 2% or 50ms
whichever is greater
Pulse conditioner timer: Setting 2% or 50ms
whichever is greater
Measurements and Recording
Facilities
Measurements
Accuracy
Current: 0.05…3 In: 1% of reading
Voltage: 0.05…2 Vn: 5% of reading
Power (W): 0.2…2 Vn, 0.05…3 In: 5% of
reading at unity power factor
Reactive Power (VArs): 0.2…2 Vn, 0.05…3 In:
5% of reading at zero power factor
Apparent Power (VA): 0.2…2 Vn, 0.05…3 In:
5% of reading
Energy (Wh): 0.2…2 Vn, 0.2…3 In: 5% of
reading at zero power factor
Energy (Varh): 0.2…2 Vn, 0.2…3 In: 5% of
reading at zero power factor
Phase accuracy: 0…360: 5%
Frequency: 40…70Hz: 0.025Hz
IRIG-B and Real Time Clock
Performance
Year 2000: Compliant
Real time accuracy: < 1 second / day
Features
Real time 24 hour clock settable in hours,
minutes and seconds
Calendar settable from January 1994 to
December 2092
Clock and calendar maintained via battery
after loss of auxiliary supply
Internal clock synchronization using IRIG-B
Interface for IRIG-B signal is BNC
Current Loop Input and Outputs
Accuracy
Current loop input accuracy: 1% of full scale
CLI drop-off threshold Under: setting 1% of
full scale
CLI drop-off threshold Over: setting 1% of full
scale