Thermal Overload Protection, Two Time Constants Trpttr (49) - ABB REB670 Applications Manual

Busbar protection 2.1 ansi, relion 670 series

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1MRK 505 337-UUS -

Application manual

ANSI10000031 V1 EN

Relay characteristic angle given in degree

In a transmission network a normal value of RCA is about 80°.

VPolMin: Minimum polarization (reference) voltage % of VBase.

I>Dir: Operate residual current level for directional comparison scheme. The setting is

given in % of IBase. The pickup forward or pickup reverse signals can be used in a

communication scheme. The appropriate signal must be configured to the communication

scheme block.

Thermal overload protection, two time constants

Current protection

ANSI10000031-1-en.vsd