Basler Electric BE1-851 - Manual (Page 57)

SECTION 4 • PROTECTION AND CONTROL
Introduction
BE1-851 relays provide many functions that can be used to protect and control power system equipment
in and around a protected zone.
BE1-851 Type H protection functions include:
• Instantaneous Overcurrent with Settable Time Delay (50TP, 50TN, 50TQ, 150TP, 150TN, 150TQ)
• Time Overcurrent (51P, 51N, 51Q)
• Breaker Failure (BF)
• General Purpose Logic Timers (62, 162)
BE1-851 Type G protection functions include:
• Instantaneous Overcurrent with Settable Time Delay (50TP, 150TP, 50TN, 150TN, 250TN, 350TN)
• Time Overcurrent (51P, 51N, 151N)
• Breaker Failure (BF)
• General Purpose Logic Timers (62, 162), (262, 362 available when style option 1 is V or W.)
BE1-851 control functions include:
• Reclosing (79)
• Virtual Selector Switches (43, 143, 243, 343) (243, 343 not available when style option 1 is V or W.)
• Virtual Breaker Control Switches (101)
Four setting groups allow coordination to be adapted for changes in operating conditions. Setting groups
can be selected using automatic or programmable logic criteria.
Using Protection and Control Functions
Three steps must be taken before using a protection or control function block:
• The function block must be enabled in the active logic scheme by the SL- command.
• Function inputs and outputs must be connected properly in a logic scheme.
• Function characteristics or settings must be programmed and based on the specific application
requirements.
If a preprogrammed logic scheme is used in a typical application, the first two steps may be skipped. Most
preprogrammed schemes are general in nature. Unneeded capabilities can be disabled by a setting of
zero. For example, if the second negative-sequence instantaneous overcurrent function is enabled but
not needed, disable it by setting the 150TQ pickup setting at zero (S#-150TQ=0).
More information about the individual function blocks of item 1 is provided in this section. Information
pertaining to items 2 and 3 is available in Section 7, BESTlogic™ Programmable Logic, and Section 8,
Application.
Setting Groups
BE1-851 relays provide a normal setting group, SG0, and up to three auxiliary setting groups, SG1, SG2,
and SG3. Auxiliary setting groups allow adapting the coordination settings to optimize them for a
predictable situation. Sensitivity and time coordination settings can be adjusted to optimize sensitivity or
clearing time based upon source conditions or to improve protection by eliminating compromises in
coordination settings with adaptive setting groups is endless. Figure 4-1 outlines the setting group control
function block.
The group of settings that are active at any point in time is controlled by the setting group control function
block. This function block allows for manual (logic) or automatic control. When manual control is enabled
by the AUTOMATIC logic input not being asserted, the function block monitors logic inputs DO, D1, D2,
and D3 and changes the active setting group according to the status of these inputs. These inputs can be
connected to logic expressions such as contact sensing inputs. When automatic control is enabled by the
9289900990 Rev R BE1-851 Protection and Control 4-1