ABB Relion 670 Series Applications Manual page 292

Section 12
Multipurpose protection
Set value for parameter
"VoltageInput"
MaxPh-Ph
13
MinPh-Ph
14
UnbalancePh-Ph
15
Note that the voltage selection from table
external VT connections. The three-phase VT inputs can be connected to IED as either three
phase-to-earth voltages, U
U . This information about actual VT connection is entered as a setting parameter for the
L3L1
pre-processing block, which will then be taken care automatically.
12.1.2.2 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 50.
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
50.
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 51.
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 51.
12.1.2.3 Application possibilities
Due to its flexibility the general current and voltage protection (CVGAPC) function can be used,
with appropriate settings and configuration in many different applications. Some of possible
examples are given below:
1. Transformer and line applications:
•
•
•
•
•
•
•
•
2. Generator protection
286
Comment
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
, U and U
L1 L2
Underimpedance protection (circular, non-directional characteristic)
Underimpedance protection (circular mho characteristic)
Voltage Controlled/Restrained Overcurrent protection
Phase or Negative/Positive/Zero Sequence (Non-Directional or Directional)
Overcurrent protection
Phase or phase-to-phase or Negative/Positive/Zero Sequence over/under voltage
protection
Thermal overload protection
Open Phase protection
Unbalance protection
© Copyright 2017 Hitachi Power Grids. All rights reserved
51 is always applicable regardless the actual
or three phase-to-phase voltages U
L3
1MRK 511 401-UEN Rev. K
, U and
L1L2 L2L3
SEMOD53443-112 v4
SEMOD53443-136 v3
Bay control REC670
Application manual