GE D90 Plus Instruction Manual page 239

CHAPTER 7: PROTECTION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Both the and
Pickup Delay
element. The auxiliary undervoltage element can be programmed to use either definite
time delay or inverse time delay characteristics.
The auxiliary undervoltage element resets instantaneously.
Select the Settings > Protection > Elements > Group 1 > Voltage > Auxiliary UV menu
item to open the auxiliary undervoltage configuration window.
Figure 184: Auxiliary undervoltage configuration settings
The following settings are available for each auxiliary undervoltage element.
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the auxiliary undervoltage protection element.
Source
Range: LINE (SRC 1), BKR 1 (SRC 2), BKR 2 (SRC 3)
Default: LINE (SRC 1)
This setting selects the signal source for the auxiliary undervoltage protection element.
Pickup
Range: 0.000 to 3.000 pu in steps of 0.001
Default: 0.700 pu
This setting specifies the auxiliary undervoltage pickup level in per-unit values.
Curve
Range: Definite Time, Inverse Time
Default: Inverse Time
This setting selects either the desired time-delay operating characteristic versus the
applied fundamental voltage or the definite time characteristic for the auxiliary
undervoltage element.
Delay
Range: 0.00 to 600.00 seconds in steps of 0.01
Default: 1.00 seconds
This setting selects the minimum operating time of the auxiliary undervoltage element.
Minimum Voltage
Range: 0.000 to 3.000 pu in steps of 0.001
Default: 0.100 pu
This setting specifies the operating voltage below which the auxiliary undervoltage
element is blocked.
settings establish the operating curve of the undervoltage
GROUPED PROTECTION ELEMENTS
231