The setting of the analog inputs are given as primary phase-to-earth or phase-to-
phase voltage. OV2PTOV will operate if the voltage gets higher than the set
percentage of the set base voltage
UBase
. This means operation for phase-to-earth
voltage over:
(%)
(
)
3
U
UBase kV
>
×
EQUATION1434 V1 EN-US
(Equation 42)
and operation for phase-to-phase voltage over:
U
(%) UBase(kV)
>
×
EQUATION1993 V1 EN-US
(Equation 43)
When phase-to-earth voltage measurement is selected the function
automatically introduces division of the base value by the square
root of three.
8.2.7.1
Measurement principle
M15330-6 v6
All the three voltages are measured continuously, and compared with the set
values,
U1>
for Step 1 and
U2>
for Step 2. The parameters
OpMode1
and
OpMode2
influence the requirements to activate the START outputs. Either
1 out of
3
,
2 out of 3
or
3 out of 3
measured voltages have to be higher than the
corresponding set point to issue the corresponding START signal.
To avoid oscillations of the output START signal, a hysteresis is included.
8.2.7.2
Time delay
M15330-10 v11
The time delay for the two steps can be either definite time delay (DT) or inverse
time delay (IDMT). For the inverse time delay four different modes are available:
•
inverse curve A
•
inverse curve B
•
inverse curve C
•
customer programmable inverse curve
The type A curve is described as:
n
n
k
t
U U
U
=
æ
ö
-
>
ç
÷
>
è
ø
IECEQUATION2422 V1 EN-US
(Equation 44)
Section 8
1MRK 506 382-UEN A
Voltage protection
278
Line distance protection REL650 2.2 IEC
Technical manual
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