• Directional element will be internally enabled to operate as soon as Iop is bigger
than 40% of I>Dir and directional condition is fulfilled in set direction.
• Relay characteristic angle AngleRCA, which defines the position of forward and
reverse areas in the operating characteristic.
Directional comparison step, built-in within directional supervision element, will set
EF4PTOC function output binary signals:
1. STFW=1 when operating quantity magnitude Iop x cos(φ - AngleRCA) is bigger
than setting parameter I>Dir and directional supervision element detects fault in
forward direction.
2. STRV=1 when operating quantity magnitude Iop x cos(φ - AngleRCA) is bigger
than 60% of setting parameter I>Dir and directional supervision element detects
fault in reverse direction.
These signals shall be used for communication based earth-fault teleprotection
communication schemes (permissive or blocking).
Simplified logic diagram for directional supervision element with integrated
directional comparison step is shown in figure
166:
Section 8 1MRK502052-UEN B
Current protection
368
Technical manual
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