ABB Relion REG670, Applications Manual

Page: 455 / 780

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-earth 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 .
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:
• 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
• Rotor Overload protection
• Loss of Excitation protection (directional pos. seq. OC protection)
• Reverse power/Low forward power protection (directional pos. seq. OC
protection, 2% sensitivity)
• Dead-Machine/Inadvertent-Energizing protection
• Breaker head flashover protection
1MRK 502 071-UEN -
Section 12
Multipurpose protection
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 449
Application manual