Basler BE1-11m User Manual

15-2 9424200996
Phase Current Differential (87) Protection BE1-11m
Trip
The Trip output becomes true when a pickup condition persists for the duration of the element Time Delay
setting. 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 the 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.
Programmable Alarm
In Percentage Differential mode, an 87 Alarm condition is indicated when the percentage-restrained
differential protection is nearing a trip condition on load.
In Flux Balance mode, an 87 alarm condition is indicated when the measured difference current exceeds
the alarm pickup level.
The alarm appears on the front-panel display, on the web-page interface, and on the Alarms metering
screen in BESTCOMSPlus. Refer to the Alarms chapter for information on how to program alarms.
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
Phase-current, differential-element logic connections are made on the BESTlogicPlus screen in
BESTCOMSPlus. The phase-current, differential-element logic block is illustrated in Figure 15-1. Logic
inputs and outputs are summarized in Table 15-1.
Figure 15-1. Phase Current Differential Element Logic Block
Table 15-1. Logic Inputs and Outputs
Name
Function
Purpose
Block
Input
Disables the 87 function when true
Trip
Output
True when the 87 element is in a trip condition
Pickup
Output
True when the 87 element is in a pickup condition
Operational Settings
Phase current differential element operational settings are configured on the Phase Current Differential
(87) settings screen (Figure 15-2) in BESTCOMSPlus. A legend for the chart (Figure 15-3) is shown by
clicking the Help button on this screen.

Basler BE1-11m Specifications

General

Brand	Basler
Model	BE1-11m
Category	Protection Device
Language	English