CHAPTER 5: SETPOINTS 5.4 PROTECTION ELEMENTS
GEK-106310-AF F650 DIGITAL BAY CONTROLLER 5-101
5.4.12 Load encroachment
The load encroachment element responds to the positive-sequence voltage and current and applies a characteristic
shown in the figure below.
Figure 5-22: Load encroachment characteristics
The element operates if the positive-sequence voltage is above a selectable level and asserts its output signal that can be
used to block selected protection elements such as distance or phase overcurrent.
Take into account that the time programmed in the overcurrent element must be higher than the time programmed in the
load encroachment function to avoid false tripping.
Load encroachment settings description:
Load Encroachment function: enable/disable the Load Encroachment function.
Min Voltage: This setting specifies the minimum positive-sequence voltage required for operation of the
element. If the voltage is below this threshold a blocking signal is not asserted by the
element.
Reach: This setting specifies the impedance reach of the element as shown in the load
encroachment characteristic diagram. This settings should be entered in secondary ohms
and be calculated as the positive-sequence impedance seen by the relay under maximum
load conditions.
SETPOINT > CONTROL ELEMENTS > LOAD ENCROACHMENT
LOAD ENCROACHMENT 1 > LOAD ENCROACHMENT 2 > LOAD ENCROACHMENT 3
SETTING DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function Permission Function DISABLED N/A [DISABLED – ENABLED]
Minimum positive-sequence voltage required Min. Voltage 25.00 0.01 V [0.00 : 300.00]
Impedance reach of the element Reach 1.00 0.01 Ohm [0.02 : 250.00]
Angle (Size of the blocking region) Angle 5 1 Deg [5 : 50]
Trip Time Pickup Delay 0.000 0.001 s [0.000 : 65.535]
Reset Time Reset Delay 0.000 0.001 s [0.000 : 65.535]
Snapshot Events Generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
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