Micom P341 - Page 16

P341/EN AD/F43 Update Documentation
(AD) -12 MiCOM P341
Negative Sequence Polarizing Quantities
Accuracy
Operating boundary Pick-up: 2 of RCA 90
Hysteresis: <3
V2pol Pick-up: Setting 10%
V2pol Drop-off: 0.9 x Setting or 0.7V
(whichever is greater) 10%
I2pol Pick-up: Setting 10%
I2pol Drop-off: 0.9 x Setting 10%
Restricted Earth Fault
Accuracy
Pick-up: Setting formula 5%
Drop-off: 0.80 (or better) of calculated
differential current
High impedance Pick-up: Setting 5%
High impedance operating time: <30ms
Transient Overreach and Overshoot
Accuracy
Additional tolerance X/R ratios:
5% over the X/R ratio of 1…90
Overshoot of overcurrent elements: <40ms
Disengagement time: <60ms (65ms SEF)
Neutral Displacement/Residual
Overvoltage
Accuracy
DT/IDMT Pick-up: Setting 5%
Drop-off: 0.95 x Setting 5%
IDMT characteristic shape: 5% or 55ms
whichever is greater
DT operation: 2% or 55ms whichever is
greater Instantaneous operation <55ms
Reset: <35ms
Repeatability: <1%
df/dt
Accuracy
Pick-up: Setting 0.5Hz/s
Operating time: 2% or 160ms whichever is
greater
Lower/Upper dead band operating time: 2%
or 160ms whichever is greater
Operation over dead band: 2% or 170ms
whichever is greater
Repeatability: <5%
Voltage Vector Shift
Accuracy
Pick-up: Setting 0.5
Trip pulse time: 500ms 2%
Reconnect Delay
Accuracy
Operating time: 2% or 50ms whichever is
greater
Undervoltage
Accuracy
DT Pick-up: Setting 5%
IDMT Pick-up: 0.95 x Setting 5%
Drop-off: 1.05 x Setting 5%
IDMT characteristic shape: 2% or 50ms
whichever is greater
DT operation: 2% or 50ms whichever is
greater
Reset: <75ms
Repeatability: <1%
Overvoltage
Accuracy
DT Pick-up: Setting 5%
IDMT Pick-up: Setting 5%
Drop-off: 0.98 x Setting 5%
IDMT characteristic shape: 2% or 50ms
whichever is greater
DT operation: 2% or 50ms whichever is
greater
Reset: <75ms
NPS Overvoltage
Accuracy
Pick-up: Setting 5%
Drop-off: 0.95 x Setting 5%
Repeatability (operating threshold): <1%
DT operation: 2% or 65ms whichever is
greater
Instantaneous operation: <60 ms
Instantaneous operation:
(accelerated): <45 ms
Disengagement time: <35ms
Repeatability (operating times): <10ms
Underfrequency
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).