Base Quantities For Cvgapc Function; Application Possibilities - ABB 650 series Applications Manual
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- Engineering manual (130 pages) ,
- Technical manual (778 pages) ,
- Product manual (33 pages)
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1MRK 511 423-UEN A
6.1.2.2
6.1.2.3
Bay control REC650 2.2 IEC
Application manual
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 11.
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 11.
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 12.
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 12.
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)
•
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
•
Special thermal overload protection
•
Open Phase protection
•
Unbalance protection
2.
Generator protection
•
80-95% Stator earth fault protection (measured or calculated 3Uo)
•
Rotor earth fault protection (with external COMBIFLEX RXTTE4
injection unit)
•
Underimpedance protection
•
Voltage Controlled/Restrained Overcurrent protection
•
Turn-to-Turn & Differential Backup protection (directional Negative
Sequence. Overcurrent protection connected to generator HV terminal
CTs looking into generator)
•
Stator Overload protection
Section 6
Multipurpose protection
SEMOD53443-112 v3
SEMOD53443-136 v2
77
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