27
DMC3S - Manual - 08 - 2021
3.9 MEASUREMENTS
—
Precision (type tests)
VALUE
Reference value
Tolerance
Reference value
Tolerance
Measured phase current
≥ 20 mA
1%
< 20 mA
1% ± 2 mA
Reconstructed phase current
≥ 20 mA
1%
< 20 mA
1% ± 2 mA
Measured residual current
≥ 20 mA
1%
< 20 mA
1% ± 2 mA
Calculated residual current
≥ 20 mA
1%
< 20 mA
1% ± 2 mA
Phase voltage
≥ 1 V
1%
< 1 V
1% ± 50 mV
Measured residual voltage
≥ 1 V
1%
< 1 V
1% ± 50 mV
Calculated residual voltage
≥ 1 V
1%
< 1 V
1% ± 50 mV
Power
≥ 20 mA and ≥ 1 V
1%
< 20 mA or < 1 V
2.5 %
Frequency
0.02 Un
5 mHz
1
U
n
3 mHz
Angles (protection 67)
≥ 20 mA and ≥ 1 V
0.5°
< 20 mA or < 1 V
1°
Angles (protection 67N)
≥ 0.005
I
En
and 0.01
U
En
0.5°
< 0.005
I
En
and 0.01
U
En
1°
Startup and operating time
1.2 x threshold regulation 1.5% ±
5 ms
—
Measurements
Direct
Frequency (
f
)
RMS fundamental phase currents
(
I
L1
,
I
L2
,
I
L3
)
RMS fundamental phase voltages
(
U
L1
,
U
L2
,
U
L3
)
RMS fundamental residual current
(
I
E
)
RMS fundamental residual voltage
(
U
E
)
RMS fundamental unbalance current
(
I
SQL
)
RMS fundamental neutral current
(
I
Ne
)
Auxiliary voltage
Auxiliary voltage
(
U
aux
)
Breaker coils current
Breaker coils current
(
I
CBcoil
)
Calculated
Phase-to-phase voltages
(
U
12
,
U
23
,
U
31
)
Calculated residual voltage
(
U
EC
)
Reconstructed L2
phase current
(
I
L2C
)
Maximum current between
I
L1
-
I
L2
-
I
L3
(
I
Lmax
)
Minimum current between
I
L1
-
I
L2
-
I
L3
(
I
Lmin
)
Mean current between
I
L1
-
I
L2
-
I
L3
(
I
L
)
Maximum voltage between
U
L1
-
U
L2
-
U
L3
(
U
Lmax
)
Mean voltage between
U
L1
-
U
L2
-
U
L3
(
U
L
)
Maximum voltage between
U
12
-
U
23
-
U
31
(
U
max
)
Mean voltage between
U
12
-
U
23
-
U
31
(
U
)
Phase shift
Phase shift of
I
L1
relative to
U
L1
(
PhiL1
)
Phase shift of
I
L2
relative to
U
L2
(
PhiL2
)
Phase shift of
I
L3
relative to
U
L3
(
PhiL3
)
Phase shift of
I
L1
relative to
U
23
(
Alpha1
)
Phase shift of
I
L2
relative to
U
31
(
Alpha2
)
Phase shift of
I
L3
relative to
U
12
(
Alpha3
)
Phase shift of
U
E
relative to
I
E
(
PhiE
)
Phase shift of
U
EC
relative to
I
E
(
PhiEC
)
—
Automatic reclosing - 79
Reclosing program (
79 Mode
)
Rapid/Rapid+Slow
Number of memorised reclosings (
N.DAR
)
0...5
(step 1)
Rapid wait (
t
rdt
)
0.10...1.00 s (step 0.01 s)
Slow wait (
t
sdt
)
1...200 s (step 1 s)
Phase trip neutralisation time (
t
rf
)
1...200 s (step 1 s)
Ground trip neutralisation time (
t
rt
)
1...200 s (step 1 s)
Rapid closing discrimination time (
t
dr
)
0...10 s (step 1 s)
Slow closing discrimination time (
t
dl
)
0...10 s (step 1 s)
Memorized closing discrimination time (
t
dm
)
0...10 s (step 1 s)
Intentional closing discrimination time (
t
d
)
1...10 s (step 1 s)
