VAMP 257
Feeder and motor manager
Technical description
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48
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VM257.EN002
tolerances in the primary equipment as well as in the relay
measurement circuit. Then, the time setting of I
02
>> is not used
for tripping purposes. The time setting specifies, how long the
manager must wait until it is certain that there is a faulty
element in the bank. After this time has elapsed, the stage
I
02
>> makes a new compensation automatically, and the
measured unbalance current for this stage is now zero. Note,
the automatic compensation does not effect on the measured
unbalance current of stage I
02
>.
If there is an element failure in the bank, the algorithm checks
the phase angle of the unbalance current related to the phase
angle of the phase current I
L1
. Based on this angle, the algo-
rithm can increase the corresponding faulty elements counter
(there are six counters).
The user can set for the stage I
02
>> the allowed number of
faulty elements, e.g. if set to three elements, the fourth fault
element will issue the trip signal.
The fault location is used with internal fused capacitor and
filter banks. There is no need to use it with fuseless or external
fused capacitor and filter banks, nor with the reactor banks.
Setting parameters of capacitor bank unbalance protection:
I
02
>, I
02
>> (50N/51N)
Parameter Value
Unit Default
Description
Input
Io; Io2; IoCalc
-
Io2
Current measurement
input.
NOTE!
Do not
use the calculated
value which is only for
earth fault protection
purposes
Io2>, Io2>> 0.01 … 8.00
(Input Io, Io2);
0.01 … 20.0
(Input IoCalc)
pu 0.10
(Io2>)
0.20 (Io2>>)
Setting value
t>
0.08 … 300.00
s
0.50 (Io2>),
1.00 (Io2>>)
Definite operating
time
CMode Off;
On
(Io2>);
Off; Normal;
Location(Io2>>)
- Off
Compensation
selection
SaveBa -;
Get
-
-
Trig the phasor
recording
SetBal
0.010 … 3.000
pu
0.050 Compensation
level
S_On
On; Off
-
On
Start on event
S_Off
On; Off
-
On
Start off event
T_On
On; Off
-
On
Trip on event
T_Off
On; Off
-
On
Trip off event
DIoSav On;
Off
-
Off
Recording trigged
event
DIoSav
On; Off
-
Off
Recording ended event