VAMP 265, Operation And Configuration Instructions

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Technical description 2 Protection functions 2.4 Differential overcurrent
protection ΔI> (87)
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Parameters of the differential overcurrent stages  I> (87):
Parameter Value/unit
Measured
values (1  L1

L2
 L3
xIn Current difference value
Setting
values (2  I> %ln Setting value
Slope1 % Slope 1 setting
Ibias2 xIn Bias current start of slope 2
Slope2 % Slope 2 setting
Harm2> On/Off 2. harmonic blocking
enable/disable
Harm2> % 2. harmonic block limit
TCntr Cumulative trip counter
Type 1-N, 2-N,
3-N
Fault type/single-phase fault e.g.:
1-N = fault on phase L1
1-2, 2-3,
1-3
Fault type/two-phase fault e.g.: 2-3
= fault between L2 and L3
1-2-3 Fault type/three-phase fault

Flt
xIn Max. value of fault differential
current as compared to I
n
Bias xIn Value of bias current of faulted
phase as compared to I
n
Load xIn 1 s mean value of pre-fault phase
currents IL1…IL3
1) Measurement ranges are described in section 9.1.1.
2) Setting ranges are described in section 9.3.2
.
Parameters of the differential overcurrent stages  I>> (87):
Parameter Value/unit
Measured
values
 L1
 L2
 L3
xIn Current difference value
Setting
values 
I>>
xIn Setting value
Recorded
values TCntr Cumulative trip counter
Type 1-N, 2-N,
3-N
Fault type/single-phase fault e.g.:
1-N = fault on phase L1
1-2, 2-3,
1-3
Fault type/two-phase fault e.g.: 2-3
= fault between L2 and L3
1-2-3 Fault type/three-phase fault

Flt
xIn Max. value of fault differential
current as compared to I
n
Load xIn 1 s mean value of pre-fault phase
currents IL1…IL3