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CON021 Displacement sensor

Setting MaxMin This parameter enables the following operating modes to be selected:
MAX (1ph): Pick-up when the highest phase current exceeds the setting.
MAX (3ph): Pick-up when the lowest phase current also exceeds the setting. This setting is not permitted, if the function is set to single-phase measurement.
MIN (1ph): Pick-up when the lowest phase current falls below the setting.
MIN (3ph): Pick-up when the highest phase current also falls below the setting. This setting is not permitted, if the function is set to single-phase measurement.
MAX-Inrush: Pick-up when the highest phase current exceeds the setting with blocking for inrush currents. Operation of the inrush blocking feature (parameter MaxMin set to 'MAX-Inrush') The inrush detector picks up and blocks operation of the function when the amplitude of the fundamental component of the current exceeds the setting of the current function. The inrush detector is based on the evaluation of the second harmonic component of the current I2h in relation to the fundamental frequency component I1h (evaluation of the amplitudes). The output of the function is disabled when the ratio I2h/I1h exceeds 10 % and enabled again when it falls below 8 %. There is no setting for the peak value of I2h/I1h. The function can operate with inrush blocking in both the single and three-phase mode (parameter 'NrOfPhase'). In the three-phase mode, the phase used for evaluation is the one with the highest amplitude at rated frequency (pick-up and inrush detection).

Directional definite time overcurrent protection 

(DirCurrentDT) A. Application Directional overcurrent function for
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. B. Features
directionally sensitive three-phase phase fault protection
insensitive to DC component
insensitive to harmonics
voltage memory feature for close faults. C. Inputs and outputs I. C.t./v.t. inputs
current
voltage II. Binary inputs
Blocking
PLC receive III. Binary outputs
start
start R
start S
start T
forwards measurement
backwards measurement
tripping IV. Measurements
current amplitude of the three phase currents (IR, IS, IT)
active power A positive measurement indicates the forwards direction (IR * UST, IS * UTR, IT * URS)
voltage amplitude Amplitudes of the phase-to-phase voltages (UST, UTR, URS).