CHAPTER 7: PROTECTION
GROUPED PROTECTION ELEMENTS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
265
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 logic for the phase undervoltage 1 element is shown below. The logic is similar for all
phase undervoltage elements.
Figure 225: Phase undervoltage 1 scheme logic
Phase overvoltage
The phase overvoltage element may 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 item
to open the phase overvoltage configuration window.
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