ISO 9001:2008
www.fanox.com
SIAC116B1011AB_Rev. 05
27 / 32
8.3.
Measurements
The accuracy of the measurement is ±2% on a band of ±20% over the nominal current
and ±4% over the rest of the measurement range.
It is shown some examples below:
-
Current inyected => I=1xIn:
→
±2% accuracy is complied.
-
Current injected => I=2xIn as this current value is 20% higher than the nominal
current
→
4% accuracy is complied.
8.4.
Protection functions
Current injection procedure:
Adjust the Sverker current generator with HOLD 0,2xIn, and suddenly, inject it to the relay,
as it would happened in real situation when circuit breaker is close, powering network line.
From this value, increase the current to achieve the function pick-up and the function trip.
8.4.1. Protection functions testing
•
50P instantaneous phase overcurrent protection:
Settings:
-
Permission: YES.
-
TAP: 1xIn.
-
Time: 2 (sec)
The following information will be checked:
-
Pick-up at 100% of the tap
-
Trip output is activated
-
Output 2 is activated
-
Trip flag is activated
•
50N instantaneous neutral overcurrent protection:
Settings:
-
Permission: YES.
-
TAP: 1xIn.
-
Time: 2 (sec)
The following information will be checked:
-
Pick-up at 100% of the tap
-
Trip output is activated
-
Output 3 is activated
-
Trip flag is activated
