Peak Value Over And Undercurrent Protection 50 (Ocinst); Mode Of Operation; Features; Inputs And Outputs - ABB RELION REB500 Technical Manual

Section 5
Bay protection functions
Signal
VT-Compens
VoltageInp
SumInp
Blocking
Trip
5.15 Peak value over and undercurrent protection 50
(OCINST)
5.15.1

Mode of operation

• General current monitoring with instantaneous response (over and undercurrent)
• Current monitoring where insensitivity to frequency is required (over and undercurrent)
5.15.2

Features

• Processes instantaneous values and is therefore fast and largely independent of
frequency
• Stores the peak value following pick-up
• No suppression of DC component
• No suppression of harmonics
• Single or three-phase measurement
• Maximum value detection in the three-phase mode
• Adjustable lower frequency limit f
5.15.3

Inputs and outputs

5.15.3.1

CT/VT inputs

• Current
5.15.3.2

Binary inputs

• Blocking
182
Description
Amplitude compensation factor for the residual voltage input, enabling different
transformation ratios of the main VTs for phase and residual voltages to be
equalized.The polarity of the residual voltage can be reversed by entering
negative values.
Defines the voltage input channel.
Any of the three-phase voltage inputs may be selected.Not applicable with delta
connected VTs.
Defines the neutral voltage input channel.
Any of the single-phase voltage inputs may be selected.
Input for blocking the function.
F: enabled
T: disabled
xx: all binary inputs (or outputs of protection functions)
Tripping signal
If the phase sequence is incorrect, tripping takes place regardless of setting (
Setting ).
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Bay protection functions REB500
Technical manual
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