CHAPTER 4: SETPOINTS PROTECTION
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–235
REFERENCE POWER PICKUP
Range: 0.001 to 1.200 CTxVT in steps of 0.001 CTxVT
Default: 0.500 CTxVT
The setting is used to calculate the inverse time characteristic delay (defined by Sref in
the equations below). A value of 1 CTxVT represents the product of a 1 VT voltage (as
specified in the overvoltage condition for this element) and a 1 CT current (as specified in
the overcurrent condition for this element.
ECA
Range: 0 to 359° in steps of 1°
Default: 0°
The setting adjusts the maximum torque angle of the element. The operating power is
calculated as:
Where:
* indicates complex conjugate. By varying the element characteristic angle (ECA), the
element can be made to respond to forward or reverse direction in inductive, resistive,
or capacitive networks as shown in the Wattmetric characteristic angle response
diagram.
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