Basler Electric BE1-11g - Manual (Page 148)

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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 BE1-11g will record a target when the Trip output becomes true. See the
Fault Reporting
chapter for more information about target reporting.
Voltage Control
Voltage control provides faster tripping when low voltage results from loss of excitation. Each mho circle
has a setting for Voltage Pickup and Voltage Time Delay when Voltage Control mode is enabled.
When the voltage decreases below the threshold established by the Voltage Pickup setting, the element
VC Pickup output becomes true. In BESTlogicPlus, the VC Pickup output can be connected to other logic
elements to annunciate the condition or control other elements in logic.
Assertion of the VC Pickup output initiates a timer which begins timing toward a trip. The duration of the
timer is established by the Voltage Time Delay. A Voltage Time Delay setting of zero (0) makes voltage
control instantaneous with no intentional time delay.
If a voltage pickup condition exists for the duration of the element Voltage Time Delay, the element VC
Trip output becomes true. In BESTlogicPlus, the VC Trip output can be connected to other logic elements
or a physical relay output to annunciate the condition and initiate corrective action. If a target is enabled
for the element, the BE1-11g will record a target when the VC Trip output becomes true. See the
Fault
Reporting chapter for more information about target reporting.
If the voltage pickup condition subsides before the element time delay expires, the timer and VC Pickup
output are reset, no corrective action is taken, and the element is rearmed for any other occurrences of
loss of excitation.
Element Blocking
Fuse Loss
The fuse loss (60FL) element of the BE1-11g can be used to block 40Z protection when fuse loss or loss
of potential is detected in a three-phase system.
If the 60FL element trip logic is true and Block Impedance is enabled, all functions that use impedance
measurements are blocked. See the
Fuse Loss (60FL) chapter for more information on the 60FL function.
Protective elements blocked by 60FL should be set so that trip times are 60 milliseconds or greater to
assure proper coordination of blocking.
Block Logic Input
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 - impedance based element logic connections are made on the BESTlogicPlus screen
in BESTCOMSPlus. The loss of excitation - impedance based element logic block is illustrated in
Figure 85. Logic inputs and outputs are summarized in Table 50.
Loss of Excitation - Impedance Based (40Z) Protection BE1-11g