10
SME70, SME70-C, SME70-M-Manual-04-2020
—
Residual overvoltage - 59VN (59V0)
U
E
> threshold
0.01...0.40 En (step 0.01 En)
t
E
> operate time
0.0...60.0 s (step 0.1 s)
Start time
0.045 s
Operation
The residual voltage is compared with the threshold. If voltage over the pickup value is detected a
start is issued and, after expiry of the associated operate time, a trip command (67N relay) is issued;
if however the voltage drop below the threshold the element is restored.
—
Voltage presence
Two thresholds are provided:
• 80% of rated voltage for trip (4% accuracy),
• 20% of rated voltage for reset (4% accuracy).
The transition between the states of presence / absence voltage is described:
• Starting from the no voltage condition (Voltage Presence OFF), the logic state of supply voltage is
detected when, for at least 250 ms the following condition is true:
(V4>80%Vn) OR (V8>80%Vn) OR (V12>80%Vn)
• Starting from the condition of Voltage Presence ON, the logic state is no longer recognized if the
following condition is true:
(V4<20%Vn) AND (V8<20%Vn) AND (V12<20%Vn) without intentional delay.
U
> threshold
0.80 En
Voltage absence threshold
0.20 En
Operate time
0.25 s
Operation
The voltage presence is indicated by through the TSV relay and the corresponding LED (V4, V8, V12)
t-int-F59N.ai
U
E
t
UE
>
U
E
>
t
TRIP
General operation time characteristic for the residual overvoltage element - 59V0
0.2 Un
0.8 Un
Voltage presence (59)
Voltage presence (59)
LED V4
V4, V8, V12
V8
V12
t
V4
0.25s
LED V8
LED V12
