I >>>, I >>>> (50N/51N) - Allen-Bradley Rockwell Automation 857 User Manual

Table 10.24 – Earth fault stages I
Input signal
Setting range I >>
0
Definite time function:
- Operating time
Start time
Reset time
Reset ratio
Inaccuracy:
- Starting
- Starting (Peak mode)
- Operate time
This is the instantaneous time i.e. the minimum total operational time including the fault
detection time and operation time of the trip contacts.
Table 10.25 – Directional intermittent transient earth fault stage I
Input selection for I peak signal
0
I peak pick up level (fixed)
0
U pickup level
0
Definite operating time
Intermittent time
Start time
Reset time
Reset ratio (hysteresis) for U
0
Inaccuracy:
- starting
- time
The actual operation time depends of the intermittent behavior of the fault and the
intermittent time setting.
Technical Data
>>, I >>>, I >>>> (50N/51N)
0 0 0
I ( input X1-7 & 8)
0
I ( input X1-9 & 10)
02
I ( = I +I +I )
0CALC L1 L2 L3
0.01 ... 8.00 When I or I
0 02
0.05 ... 20.0 When I
0CALC
0.08 – 300.00 s (step 0.02 s)
Typically 60 ms
<95 ms
0.95
±2% of the set value or ±0.3% of the rated value
±5% of the set value or ±2% of the rated value
(Sine wave <65 Hz)
±1% or ±30 ms
I Connectors X1-7&8
01
I Connectors X1-9&10
02
0.1 x I @ 50 Hz
0N
10 – 100 % U
0N
0.12 – 300.00 s (step 0.02)
0.00 – 300.00 s (step 0.02)
<60 ms
<60 ms
0.97
±3% for U . No inaccuracy defined for I
0
±1% or ±30 ms
857-UM001A-EN-P – July 2009
10-9
> (67NT)
0T
transients
0