Basler BE1-11g, Instruction Manual

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66 9424200994 Rev U
Auxiliary Undervoltage (27X) Protection BE1-11 g
Trip
The Trip output becomes true if an undervoltage pickup condition persists for the duration of the element
Time Delay setting or calculated inverse time. In BESTlogic
Plus , 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 BE1-11
g will record a target when the Trip output
becomes true. See the Fault Reporting chapter for more information about target reporting.
Voltage Inhibit
The Voltage Inhibit setting impedes auxiliary undervoltage element operation during undervoltage
conditions that may occur during equipment startup. This setting is expressed in primary or secondary
voltage depending on the Settings Display Mode selected on the General Settings/Display Units settings
screen in BESTCOMS
Plus.
Its unit of measure depends upon the auxiliary VT connection setting and 27X element mode selected.
For AB, BC, and CA sensing connections in Vx Fundamental or Vx Third Harmonic mode, the inhibit level
is expressed in Vpp. For AN, BN, CN, or Ground sensing connections in Vx Fundamental or Vx Third
Harmonic mode, the inhibit level is expressed in Vpn. The inhibit level is always expressed in Vpn for V1,
V2, and 3V0 modes of the 27X element.
Element Blocking
Fuse Loss
The fuse loss (60FL) element of the BE1-11
g
can be used to block 27X 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 Phase/V1 is enabled, the 27X function will be blocked
when configured for V1 mode. If Block V2 is enabled, the 27X function will be blocked when configured
for V2 mode. If Block 3V0 is enabled, the 27X function will be blocked when configured for 3V0 mode.
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 BESTlogic
Plus . When the element is initially selected from the
Elements view, the default condition of the Block input is a logic 0.
Logic Connections
Auxiliary undervoltage element logic connections are made on the BESTlogic Plus screen in
BESTCOMS Plus . The auxiliary undervoltage element logic block is illustrated in Figure 48. Logic inputs
and outputs are summarized in Table 19.
Figure 48. Auxiliary Undervoltage Element Logic Block
Table 19. Logic Inputs and Outputs
Name Logic Function Purpose
Block Input Disables the 27X function when true
Trip Output True when the 27X element is in a trip condition