VAMP 265 - 9.3.4. Circuit-Breaker Failure Protection

9.3 Protection functions
9 Technical data
Technical description
210
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VM265.EN011
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
>>
0.02 … 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.
9.3.3. Second harmonic function
2. Harmonic stage (51F2)
Settings:
- Setting range 2.Harmonic
10 – 100 %
- Operating time
0.05 – 300.00 s (step 0.01 s)
Inaccuracy:
- Starting
±1%- unit
NOTE! The amplitude of second harmonic content has to be at least 2% of the
nominal of CT. If the moninal current is 5 A, the 100 Hz component needs
to exceed 100 mA.
9.3.4. Circuit-breaker failure protection
Circuit-breaker failure protection CBFP (50BF)
Relay to be supervised
T1-T12
Definite time function
- Operating time
0.1** – 10.0 s (step 0.1 s)
Reset time
<95 ms
Inaccuracy
- Operating time
±20 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.