Rockwell Automation 865 Differential Protection Relay - Manual (Page 178)

10-8 Technical
Data
865-UM001A-EN-P – July 2009
Table 10.21 – Earth fault stage I 0 > (50N/51N)
Input signal I
0
( input X1-7 & 8)
I
02
( input X1-9 & 10)
I
0Calc
( = I
L1
+I
L2
+I
L3
)
Setting range I
0
> 0.005 … 8.00 When I
0
or I
02
0.05 … 20.0 When I
0Calc
Definite time function: DT
- Operating time 0.08 – 300.00 s (step 0.02 s)
IDMT function:
- Delay curve family (DT), IEC, IEEE, RI Prg
- Curve type EI, VI, NI, LTI, MI…depends on the family
- Time multiplier k 0.05 – 20.0, except
0.50 – 20.0 for RXIDG, IEEE and IEEE2
Start time Typically 60 ms
Reset time <95 ms
Reset ratio 0.95
Inaccuracy:
- Starting
±2% of the set value or ±0.3% of the rated value
- Starting (Peak mode) ±5% of the set value or ±2% of the rated value
(Sine wave <65 Hz)
- Operating time at definite time function ±1% or ±30 ms
- Operating time at IDMT function. ±5% or at least ±30 ms
EI = Extremely Inverse, NI = Normal Inverse, VI = Very Inverse, LTI = Long Time Inverse
MI= Moderately Inverse
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 10.22 – Earth fault stages I 0 >>, I 0 >>>, I 0 >>>> (50N/51N)
Input signal I
0
( input X1-7 & 8)
I
02
( input X1-9 & 10)
I
0Calc
( = I
L1
+I
L2
+I
L3
)
Setting range I
0
>> 0.01 … 8.00 When I
0
or I
02
0.05 … 20.0 When I
0Calc
Definite time function:
- Operating time 0.08 **) – 300.00 s (step 0.02 s)
Start time Typically 60 ms
Reset time <95 ms
Reset ratio 0.95
Inaccuracy:
- Starting
±2% of the set value or ±0.3% of the rated value
- Starting (Peak mode) ±5% of the set value or ±2% of the rated value
(Sine wave <65 Hz)
- Operate time ±1% or ±30 ms
This is the instantaneous time i.e. the minimum total operational time including the fault
detection time and operation time of the trip contacts.