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1MRK 502 071-UUS A
12.1.2.2
12.1.2.3
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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.
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 48.
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 48.
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 49.
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 49.
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:
•
Underimpedance protection (circular, non-directional characteristic) (21)
•
Underimpedance protection (circular mho characteristic) (21)
•
Voltage Controlled/Restrained Overcurrent protection (51C, 51V)
•
Phase or Negative/Positive/Zero Sequence (Non-Directional or Directional)
Overcurrent protection (50, 51, 46, 67, 67N, 67Q)
•
Phase or phase-to-phase or Negative/Positive/Zero Sequence over/under
voltage protection (27, 59, 47)
•
Special thermal overload protection (49)
•
Open Phase protection
•
Unbalance protection
2.
Generator protection
Section 12
Multipurpose protection
SEMOD53443-112 v3
SEMOD53443-136 v2
485
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