Base Quantities For Cvgapc Function - ABB Relion 670 Series Applications Manual

Section 10
Multipurpose protection
Set value for parameter
"VoltageInput"
MinPh
8
UnbalancePh
9
PhaseA - PhaseB
10
PhaseB - PhaseC
11
PhaseC - PhaseC
12
MaxPh-Ph
13
MinPh-Ph
14
UnbalancePh-Ph
15
It is important to notice that the voltage selection from table
the actual external VT connections. The three-phase VT inputs can be connected to IED as either
three phase-to-groundvoltages VA, VB and VC or three phase-to-phase voltages VAB, VBC and
VCA. This information about actual VT connection is entered as a setting parameter for the pre-
processing block, which will then take automatically care about it.
10.1.2.2

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 23.
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 23.
Base voltage shall be entered as:
1. rated phase-to-ground voltage of the protected object in primary kV, when the measured
Voltage Quantity is selected from 1 to 9, as shown in table 24.
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 24.
228
Comment
CVGAPC function will measure voltage phasor of the phase with minimum
magnitude
CVGAPC function will measure magnitude of unbalance voltage, which is
internally calculated as the algebraic magnitude difference between the
voltage phasor of the phase with maximum magnitude and voltage phasor of
the phase with minimum magnitude. Phase angle will be set to 0° all the time
CVGAPC function will measure the voltage phasor internally calculated as the
vector difference between the phase A voltage phasor and phase B voltage
phasor (VA-VB)
CVGAPC function will measure the voltage phasor internally calculated as the
vector difference between the phase B voltage phasor and phase C voltage
phasor (VB-VC)
CVGAPC function will measure the voltage phasor internally calculated as the
vector difference between the phase C voltage phasor and phase A voltage
phasor (VC-VA)
CVGAPC function will measure ph-ph voltage phasor with the maximum
magnitude
CVGAPC function will measure ph-ph voltage phasor with the minimum
magnitude
CVGAPC function will measure magnitude of unbalance voltage, which is
internally calculated as the algebraic magnitude difference between the ph-ph
voltage phasor with maximum magnitude and ph-ph voltage phasor with
minimum magnitude. Phase angle will be set to 0° all the time
1MRK 511 358-UUS A
24 is always applicable regardless
Application manual
SEMOD53443-112 v3