17-2 9424200996
Loss of Excitation - Reverse Var Based (40Q) Protection BE1-11m
Assertion of the Pickup output initiates a timer that begins timing to a trip. The duration of the timer is
established by the Time Delay setting. A Time Delay setting of zero (0) makes the 40Q element
instantaneous with no intentional time delay.
If the pickup condition subsides before the element delay expires, the timer and Pickup output are reset,
no corrective action is taken, and the element is rearmed for any other occurrences of loss of excitation.
Trip
The Trip output becomes true if a loss of excitation pickup condition exists for the duration of the element
Time Delay. In BESTlogicPlus, the Trip output can be connected to other logic elements and to a physical
relay output to annunciate the condition and to initiate corrective action. If a target is enabled for the
element, the BE1-11m will record a target when the Trip output becomes true. See the Fault Reporting
chapter for more information about target reporting.
Element Blocking
The Block input provides logic-supervision control of the element. When true, the Block input disables the
element by forcing the Trip and Pickup outputs to logic 0 and resetting the element timer. Connect the
element Block input to the desired logic in BESTlogicPlus. When the element is initially selected from the
Elements view, the default condition of the Block input is a logic 0.
Logic Connections
Loss of excitation - reverse var based element logic connections are made on the BESTlogicPlus screen
in BESTCOMSPlus. The loss of excitation - reverse var based element logic block is illustrated in Figure
17-2. Logic inputs and outputs are summarized in Table 17-1.
Figure 17-2. Loss of Excitation - Reverse var Based Element Logic Block
Table 17-1. Logic Inputs and Outputs
Disables the 40Q function when true
True when the 40Q element is in a trip condition
True when the 40Q element is in a pickup condition
Operational Settings
Loss of excitation - reverse var based element operational settings are configured on the Loss of
Excitation - Reverse var Based (40Q) settings screen (Figure 17-3) in BESTCOMSPlus.
Figure 17-3. Loss of Excitation - Reverse var Based Settings Screen
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