Alstom MiCOM P546 - Page 38

P54x/EN TD/La4 Technical Data
(TD) 2-8 MiCOM P543, P544, P545 & P546
TD
IEEE reset: 17.5% or 60 ms
whichever is greater
DT operation: 2% or 50 ms
whichever is greater
DT reset: 5% or 50 ms whichever is
greater
Repeatability: 5%
* Reference conditions TMS = 1, TD
= 1, and IN> setting of 100 mA, accuracy
operating range 2-20 ls
Definite time operation:
Wattmetric SEF
Pick-up P=0W: ISEF> 5% or 5 mA
Pick-up P>0W: P> 5%
Drop-off P=0W: (0.95 x ISEF >) 5% or
5 mA
Drop-off P>0W: 0.9 x P> 5%
Boundary accuracy: 5% with 1
hysteresis
Repeatability: 1%
Polarizing quantities
VN> and V2> Level detectors:
Pick-up: 10%
Resetting ratio: 0.9
I2> Level detector:
Pick-up: 10%
Resetting ratio: 0.9
Negative sequence overcurrent
Accuracy
Pick-up: Setting 5%
Drop-off: 0.95 x setting
Definite time operation:
60 ms or 2%, whichever is greater
Repeatability: 1%
Directional boundary accuracy:
2° with hysteresis <1°
Reset: <35 ms
Undervoltage
Accuracy
DT Pick-up: Setting 2%
IDMT Pick-up: 0.98 x setting 2%
Drop-off: 1.02 x setting 2%
Definite time operation:
40 ms or 2%, whichever is greater
Repeatability: 1%
IDMT characteristic shape:
40 ms or 2%, whichever is greater
Reset: <75 ms
Overvoltage
Accuracy
DT Pick-up: Setting 1%
IDMT Pick-up: 1.02 x setting 2%
Drop-off: 0.98 x setting 2%
40 ms or 2%, whichever is greater
Repeatability: 1%
IDMT characteristic shape:
40 ms or 2%, whichever is greater
Reset: <75 ms
Neutral displacement/residual
overvoltage
Accuracy
DT Pick-up: Setting 5%
IDMT Pick-up: 1.05 x setting 5%
Drop-off: 0.95 x setting 5%
Definite time operation:
20 ms or 2%, whichever is greater
Instantaneous operation: <50 ms
Repeatability: 10%
IDMT characteristic shape:
60 ms or 5%, whichever is greater
Reset: <35 ms
Circuit breaker fail and undercurrent
Accuracy
Pick-up: 10% or 0.025 In, whichever is
greater
Operating time: <12 ms
Timers: 2 ms or 2%, whichever is greater
Reset: <15 ms
Broken conductor logic
Accuracy
Pick-up: Setting 2.5%
Drop-off: 0.95 x setting 2.5%
Definite time operation:
50 ms or 2%, whichever is greater
Reset: <25 ms
Thermal overload
Accuracy
Thermal alarm pick-up:
Calculated trip time 10%
Thermal overload pick-up:
Calculated trip time 10%
Cooling time accuracy 15% of theoretical
Repeatability: <5%
* Operating time measured with applied
current of 20% above thermal setting.