GE D90 Plus - Page 278

268 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUPED PROTECTION ELEMENTS CHAPTER 7: PROTECTION
PHASE UV1 OP............................................. Asserted when at least one phase of the phase undervoltage 1
element operates.
PHASE UV1 OP A ........................................ Asserted when phase A of the phase undervoltage 1 element
operates.
PHASE UV1 OP B ........................................ Asserted when phase B of the phase undervoltage 1 element
operates.
PHASE UV1 OP C ........................................ Asserted when phase C of the phase undervoltage 1 element
operates.
PHASE UV1 PKP .......................................... Asserted when at least one phase of the phase undervoltage 1
element picks up.
PHASE UV1 PKP A ...................................... Asserted when phase A of the phase undervoltage 1 element
picks up.
PHASE UV1 PKP B ...................................... Asserted when phase B of the phase undervoltage 1 element
picks up.
PHASE UV1 PKP C ...................................... Asserted when phase C of the phase undervoltage 1 element
picks up.
PHASE UV2.................................................... Same set of operands as shown above for the phase
undervoltage 2 element.
The figure shows the logic for the phase undervoltage 1 element. The logic is similar for all
phase undervoltage elements.
Figure 229: Phase undervoltage 1 logic
Phase overvoltage
The phase overvoltage element can be used as an instantaneous element with no
intentional time delay or as a definite time element. The input voltage is the phase-to-
phase voltage, either measured directly from delta-connected VTs or as calculated from
phase-to-ground (wye) connected VTs. The specific voltages to be used for each phase are
shown in the logic diagram.
Select the Settings > Protection > Elements > Group 1 > Voltage > Phase OV menu to
open the phase overvoltage configuration window.
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