Vpickup
VBase kV
>
⋅
(%)
(
) / 3
EQUATION1610 V2 EN
(Equation 29)
and operation for phase-to-phase voltage over:
Vpickup
(%) VBase(kV)
>
×
EQUATION1992 V1 EN
(Equation 30)
When phase-to-ground 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
All the three voltages are measured continuously, and compared with the set values,
Pickup1
and
Pickup2
. The parameters
OpMode1
and
OpMode2
influence the
requirements to activate the PICKUP 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 PICKUP signal.
To avoid oscillations of the output PICKUP signal, a hysteresis has been included.
8.2.7.2
Time delay
The time delay for step 1 can be either definite time delay (DT) or inverse time
overvoltage (TOV). Step 2 is always definite time delay (DT). For the inverse time
delay three different modes are available:
•
inverse curve A
•
inverse curve B
•
inverse curve C
The type A curve is described as:
t
TD
V
Vpickup
Vpickup
=
−
>
>
EQUATION1625 V2 EN
(Equation 31)
The type B curve is described as:
1MRK 505 277-UUS C
Section 8
Voltage protection
133
Technical Manual
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