Basler BE1-11g Instruction Manual page 337

9424200994 Rev U
Details of Default Logic Scheme
The following paragraphs describe the default logic scheme in detail. Operation of the protection and
control logic under normal conditions is described. The features of the logic scheme are broken down into
functional groups and described in detail.
The default logic scheme is intended for applications requiring three-phase and neutral non-directional
overcurrent protection. This logic scheme provides an excellent base on which to create a custom
scheme for a specific application.
The components of the default logic are summarized in Table 106 and Table 107. Figure 243 shows a
one-line drawing for the default logic scheme. A diagram of the default logic is shown in Figure 244.
Operation - Protection
The phase, neutral, and negative-sequence elements are activated to provide timed (51) and
instantaneous (50) overcurrent protection in this scheme. A function block is disabled by setting the
pickup setpoint at zero in each of the four setting groups. OUT1 will operate and trip the breaker. Contact
outputs OUT2, OUT3, OUT4, and OUT5 are designated to specific function blocks. OUT2 operates for
instantaneous phase overcurrent conditions, OUT3 trips for timed phase overcurrent situations, OUT4
operates for instantaneous neutral and negative-sequence overcurrent conditions, and OUT5 operates for
timed neutral and negative-sequence overcurrent conditions. All contact sensing inputs are unassigned.
Operation - Setting Group Selection
A setting group can be selected automatically or by using the communication ports or the front-panel
interface. Automatic setting group changes are based on current level and duration. Automatic setting
group changes for cold load pickup and/or dynamic setting adjustments are enabled by using
BESTCOMSPlus. Setting group changes are not accommodated in this scheme.
Operation - Alarms
If the continuous self-test diagnostics of the BE1-11g detect an error, failsafe output contact OUTA will
close and the Relay Trouble LED on the front panel will light. OUTA will also close if BE1-11g operating
power is lost. More information about alarms is provided in the Alarms chapter.
Function
50-1 Used for instantaneous phase overcurrent protection.
50-2 Used for instantaneous neutral overcurrent protection.
50-3 Used for instantaneous negative-sequence overcurrent protection.
51-1 Used for timed phase overcurrent protection.
51-2 Used for timed neutral overcurrent protection.
51-3 Used for timed negative-sequence overcurrent protection.
Trip
FAULT TRIGGER Picked Up
Logic
Output Purpose
OUTA Alarm Output Contact.
OUT1 Breaker Trip Output.
BE1-11g
Table 106. Default Function Block Logic
Purpose
Table 107. Default Output Logic
Description
Alarm contact closes/opens (refer
to style number) automatically
when relay trouble alarm occurs.
Contact closes when protective
trip expression is TRUE.
BESTlogic™Plus
Inputs
Trip Bus
Pickup Bus
State Labels
Label
Energized
Output
On
Alarm
Output
On
1
BESTlogic™Plus
325
0
0
0
0
0
0
0
De-
Energized
Off
Off