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Set value for parameter
"VoltageInput"
Comment
13
MaxPh-Ph
CVGAPC function will measure ph-ph voltage phasor with the maximum
magnitude
14
MinPh-Ph
CVGAPC function will measure ph-ph voltage phasor with the minimum
magnitude
15
UnbalancePh-Ph
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
It is important to notice that the voltage selection from table
regardless the actual external VT connections. The three-phase VT inputs can be connected to
IED as either three phase-to-earth voltages U
L1
, U
L2
& U
L3
or three phase-to-phase voltages
U
L1L2
, U
L2L3
& U
L3L1
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.
11.1.2.2
Base quantities for CVGAPC function
SEMOD53443-112 v3
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
11.1.2.3
Application possibilities
SEMOD53443-136 v2
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:
•
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
Section 11
1MRK 505 343-UEN B
Multipurpose protection
496
Application manual
Содержание Relion 670 series
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