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

Section 11
Multipurpose protection
Set value for parameter
"VoltageInput"
6 -3*ZeroSeq
7 MaxPh
8 MinPh
9 UnbalancePh
10 PhaseA-PhaseB
11 PhaseB-PhaseC
12 PhaseC-PhaseC
13 MaxPh-Ph
14 MinPh-Ph
15 UnbalancePh-Ph
Note that the voltage selection from table
connections. The three-phase VT inputs can be connected to IED as either three phase-to-ground
voltages, VA, VB and VC or three phase-to-phase voltages V
actual VT connection is entered as a setting parameter for the pre-processing block, which will then be
taken care automatically.
11.1.3.2

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-to-earth current of the protected object in primary amperes, when the measured Current
Quantity is selected from 1 to 9, as shown in table 21.
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 21.
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 22.
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 22.
172
Comment
CVGAPC function will measure internally calculated zero sequence voltage phasor
multiplied by factor 3. This voltage phasor will be intentionally rotated for 180° in
order to enable easier settings for the directional feature when used.
CVGAPC function will measure voltage phasor of the phase with maximum
magnitude
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
22 is always applicable regardless the actual external VT
© 2017 - 2023 Hitachi Energy. All rights reserved
1MRK511407-UUS Rev. N
, V and V . This information about
AB BC CA
Phasor measurement unit RES670
SEMOD53443-112 v4
Application manual