VAMP 259 - Page 285

Technical description
9 Technical data
9.3 Protection stages
VM259.EN007
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285
Short circuit distance stages Z1-Z5 (21)
Pick-up setting range X
0.05  250 Ω
Pick-up setting range R
0.05  250 Ω
Definite time function:
- Setting range
0.05*) – 300.00 s (step 0.01 s)
Reset time
<65 ms
Retardation time
<50 ms
Reset ratio
1.05
Inaccuracy:
- Starting
(when U > 1V and I > 0.5 A + UxI > 10 VA)
Typically ±5% of X (R if R > X) or 10 mΩ
- Operating time at definite time function
1% or ±25 ms
*) This is the instantaneous time i.e. the minimum settable total operational time including the
fault detection time and operation time of the trip contacts.
Earth-fault distance stages Z1e-Z5e (21N)
Pick-up setting range X
0.05  250 Ω
Pick-up setting range R
0.05  250 Ω
Definite time function:
- Setting range
0.05*) – 300.00 s (step 0.01 s)
Start Io current setting range
0.01 - 8.00 x I
0n
0.05 … 20.0 When I
0Calc
Start Io current input
I
0
( input X1-7 & 8)
I
0Calc
( = I
L1
+I
L2
+I
L3
)
Reset time
<65 ms
Retardation time
<50 ms
Reset ratio
1.05
Inaccuracy:
- Starting
(when U > 1V and I > 0.5 A + UxI > 10 VA)
Typically ±5% of X (R if R > X) or 10 mΩ
- Operating time at definite time function
1% or ±25 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.
Distance common settings (21 and 21N)
Line angle
60 – 90°
Load block:
Pick-up setting range R
0.05 – 250 Ω
Load angle
10 - 40°
Earth factor:
Setting range
0.00 – 10.00
Earth factor angle
-60 - 60°
Power swing:
dZ
1.0 – 50.00
Inaccuracy:
Starting
±0.2 Ω of set value (when setting is 1.0 -5.0)
NOTE! All distance zones are using angle memory when voltage of all phase is
dropped below 0.5 V. Angle memory is active for maximym of 500 ms. So
if the tripping time of zones is more than 0.5 s, there won’t be trip.
Direction checkin of angle memory function is based on U1.