Base Quantities For Cvgapc Function - ABB Relion 650 Series Technical Manual

Section 6
Multipurpose protection
6.1.7.2
6.1.7.3
96
Table 41: Restraint current selection for CVGAPC function
Set value for the
RestrCurr
parameter
1 PosSeq
2 NegSeq
3 3ZeroSeq
4 MaxPh

Base quantities for CVGAPC function

The parameter settings for the base quantities, which represent the base (100%) for
pickup levels of all measuring stages shall be entered as setting parameters for
every CVGAPC function.
Base current shall be entered as:
1. rated phase current of the protected object in primary amperes, when the
measured Current Quantity is selected from 1 to 9, as shown in table "".
2. rated phase current of the protected object in primary amperes multiplied by
√3 (1.732 x Iphase), when the measured Current Quantity is selected from 10
to 15, as shown in table "".
Base voltage shall be entered as:
1. rated phase-to-earth voltage of the protected object in primary kV, when the
measured Voltage Quantity is selected from 1 to 9, as shown in table "".
2. rated phase-to-phase voltage of the protected object in primary kV, when the
measured Voltage Quantity is selected from 10 to 15, as shown in table "".
Built-in overcurrent protection steps
Two overcurrent protection steps are available. They are absolutely identical and
therefore only one will be explained here.
Overcurrent step simply compares the magnitude of the measured current quantity
(see table 39) with the set pickup level. Non-directional overcurrent step will
pickup if the magnitude of the measured current quantity is bigger than this set
level. However depending on other enabled built-in features this overcurrent
pickup might not cause the overcurrent step start signal. Start signal will only come
if all of the enabled built-in features in the overcurrent step are fulfilled at the same
time.
Comment
CVGAPC function will measure internally calculated positive sequence
current phasor
CVGAPC function will measure internally calculated negative
sequence current phasor
CVGAPC function will measure internally calculated zero sequence
current phasor multiplied by factor 3
CVGAPC function will measure current phasor of the phase with
maximum magnitude
1MRK 511 424-UEN B
SEMOD53443-112 v4
M13751-136 v3
Bay control REC650 2.2 IEC
Technical manual