CHAPTER 5: SETTINGS GROUPED ELEMENTS
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 5-219
5
Figure 5-122: Load encroachment applied to distance element
LOAD ENCROACHMENT MIN VOLT — This setting specifies the minimum positive-sequence voltage required for operation of
the element. When the voltage is below this threshold, a blocking signal is not asserted by the element. When selecting
this setting, remember that the D30 measures the phase-to-ground sequence voltages regardless of the VT connection.
The nominal VT secondary voltage as specified with the
SYSTEM SETUP AC INPUTS VOLTAGE BANK X5 PHASE VT
SECONDARY
setting is the per-unit base for this setting.
LOAD ENCROACHMENT REACH — This setting specifies the resistive reach of the element as shown in the Load
Encroachment Characteristic diagram. Enter this setting in secondary ohms and calculate it as the positive-sequence
resistance seen by the relay under maximum load conditions and unity power factor.
LOAD ENCROACHMENT ANGLE — This setting specifies the size of the blocking region as shown on the Load Encroachment
Characteristic diagram and applies to the positive-sequence impedance.
Figure 5-123: Load encroachment logic
5.7.7 Phase current
5.7.7.1 Menu
SETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) PHASE CURRENT
PHASE CURRENT
PHASE TOC 1
See page 5-225
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