Application - ABB RELION REX640 Technical Manual

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Protection related functions

The operating sector is defined by the setting Min forward angle, Max forward angle,

Min reverse angle and Max reverse angle. The options that can be selected for the

Directional mode setting are "Forward" and "Reverse".

The sector limits are always given as positive degree values.

The Characteristic angle setting is also known as Relay

Characteristic Angle (RCA), Relay Base Angle or Maximum Torque

Configurable directional settings

Low-level blocking

For a reliable operation, signal levels should be greater than the minimum level. If they

are not greater than the minimum level, Timer is blocked. If the amplitude of the

positive-sequence current is greater than the Min trip current value and the positive-

sequence voltage amplitude is greater than the Min trip voltage value, the On signal is

sent to Timer.

Once activated, the internal operating timer is started. The Timer characteristic is

according to definite time DT. When Timer has reached the value of Release delay

time, the RELEASE output is activated. If a drop-off situation happens, that is, if the

operating current moves outside the operating sector or signal amplitudes drop below

the minimum level before Release delay time is exceeded, the Timer reset state is

activated. If the drop-off continues for more than Reset delay time, Timer is

deactivated.

Blocking logic

The binary input BLOCK can be used to block the function. The activation of the

BLOCK input deactivates the RELEASE output and resets Timer.

Application

The three-phase power directional element function DPSRDIR improves the

possibility to obtain a selective function of the overcurrent protection in meshed

networks. DPSRDIR is used to block or release other overcurrent protection

1MRS759142 C

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