Technical Data P54x/EN TD/La4
MiCOM P543, P544, P545 & P546
(TD) 2-7
Protection functions
Phase current differential protection
Accuracy
Pick-up: Formula 10%
Drop-off: 0.75 x Formula 10%
IDMT characteristic shape: 5% or
40 ms whichever is greater
DT operation: 2% or 20 ms whichever
is greater
Instantaneous Operation: <30 ms
TD
Res
et time: <60 ms
Repeatability: 2.5%
Characteristic:
UK curves IEC 60255-3 – 1998
US curves IEEE C37.112 – 1996
Vector compensation:
No affect on accuracy
Current transformer ratio
Compensation
No affect on accuracy
High set characteristic setting:
No affect on accuracy
Two ended scheme operation:
No affect on accuracy
Three ended scheme operation:
No affect on accuracy
Distance protection
All quoted operating times include the closure
of the trip output contact.
The following tripping characteristics, show
Operating time Versus reach percentage, for
faults close to line angle
50 Hz operation
60 Hz operation
Accuracy
Characteristic shape, up to SIR = 30:
5% for on-angle fault (the set line angle)
10% off-angle
(Example: For a 70 degree set line angle,
injection testing at 40 degrees would be
referred to as “off-angle”).
Zone time delay deviations:
20 ms or 2%, whichever is greater.
Sensitivity
Settings < 5/In : (0.05In*5/(setting*In)) 5%
Settings > 5/In : 0.05 In 5%
Out of step
Accuracy of zones and timers as per distance
Operating range: up to 7 Hz
Phase and ground (earth)
overcurrent
Accuracy
Pick-up: Setting 5%
Drop-off: 0.95 x setting 5%
Minimum trip level for IDMT elements:
1.05 x Setting 5%
Inverse time stages:
40 ms or 5%, whichever is greater
Definite time stages:
40 ms or 2%, whichever is greater
Repeatability: 5%
Directional boundary accuracy:
2° with hysteresis <3°
Additional tolerance due to increasing X/R
ratios:
5% over the X/R ratio from 1 to 90.
Overshoot of overcurrent elements: <30 ms
SEF
Pick-up: Setting 5%
Drop-off: 0.95 x Setting 5%
Minimum trip level of IDMT elements:
1.05 x Setting 5%
IDMT characteristic shape:
5% or 40ms whichever is greater*
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