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Installation_Guide_SIAB000B0010AA_Rev. 03 27 / 32
NOTE
:
Apart from the measurement accuracy (±5%), it must be also considered the
admissible current measurement (±5%).
•
51P Inverse time phase overcurrent protection:
TEST 1:
Settings:
-
Permission: YES.
-
Curve: IEC Inverse.
-
Dial: 0.05
-
TAP: 1xIs=16 A
-
Theoretical tripping time= 0.86 seconds (Fault current 24 A):
o
admissible current measurement: 24+5%= 25.2 A.
Time: 0.77s -5% = 0.7315s
o
admissible current measurement: 24-5%= 22.8 A
Time: 0.98s +5% = 1.029s.
The following information will be checked:
-
Pick-up at 110% of the tap
-
Trip output is activated
-
Trip flag is activated
TEST 2
Settings:
-
Permission: YES.
-
Curve: IEC Inverse.
-
Dial: 1
-
TAP: 1xIs=16 A.
-
Theoretical tripping time = 17.19 seconds (fault current 24 A)
o
admissible current measurement: 24+5%= 25.2 A
Time: 15.34s -5% = 14.573s
o
admissible current measurement: 24-5%= 22.8 A
Time: 19.69s +5% = 20.674s.
The following information will be checked:
-
Pick-up at 110% of the tap
-
Trip output is activated
-
Trip flag is activated
Real admissible t
ripping time range: [0.7315s…1.029s]
Real admissible tripping time range: [14.573
s…20.674s]
