Directional Overcurrent Definite Time Protection 67 (Dirocdt); Mode Of Operation; Features; Inputs And Outputs - ABB RELION REB500 Technical Manual

1MRK 505 406-UEN B
5.4 Directional overcurrent definite time protection 67
(DIROCDT)
5.4.1

Mode of operation

Directional overcurrent function:
• detecting phase faults on ring lines
• detecting phase faults on double-circuit lines with an infeed at one end
• backup protection for a distance protection scheme
5.4.2

Features

• Directional phase fault protection
• Insensitive to DC component
• Insensitive to harmonics
• Voltage memory feature for close faults
5.4.3

Inputs and outputs

5.4.3.1

CT/VT inputs

• Current
• Voltage
5.4.3.2

Binary inputs

• Blocking
• PLC receive
5.4.3.3

Binary outputs

• Start
• Start L1
• Start L2
• Start L3
• Forwards measurement
• Backwards measurement
• Tripping
5.4.3.4

Measurements

• Current amplitude of the three phase currents (IL1, IL2, IL3)
• Active power
• A positive measurement indicates the forwards direction (IL1 × UL2L3, IS × UL3L1, IL3 ×
UL1L2)
• Voltage amplitude of the phase-to-phase voltages (UL2L3, UL3L1, UL1L2)
Bay protection functions REB500
Technical manual
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Section 5
Bay protection functions
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