Date Code 20170927 Instruction Manual SEL-751 Relay
Section 9
Bay Control
Overview
The SEL-751 Relay with the touchscreen display option provides you with the
ability to design bay configuration screens to meet your system needs. The
bay configuration can be displayed as a single-line diagram (SLD) on the
touchscreen. You can create as many as five bay screens with one controllable
breaker and as many as five monitor-only disconnects. ANSI and IEC
symbols, along with analog and digital labels, are available for you to create
detailed single-line diagrams of the bay to indicate the status of the breaker
and disconnects, bus voltages, and power flow through the breaker. In addition
to single-line diagrams, you can design the screens to show the status of
various relay elements via Relay Word bits or to show analog quantities for
commissioning or day-to-day operations. These screens can be designed with
the help of
ACSELERATOR Bay Screen Builder SEL-5036 Software in
conjunction with
ACSELERATOR QuickSet SEL-5030 Software. Note that the
bay screen related settings can only be set via QuickSet (setting via an ASCII
terminal is not supported).
This section covers all aspects of the SEL-751 Relay bay control.
➤ Circuit Breaker Symbol Settings and Status Logic on page 9.1
➤ Disconnect Switch Symbol Settings and Status Logic on
page 9.2
➤ Local/Remote Breaker Control on page 9.3
➤ Breaker Control Via the Touchscreen on page 9.5
➤ Bay Screens Design Using QuickSet and Bay Screen Builder on
page 9.6
➤ Bay Control Application Example on page 9.13
Circuit Breaker
Symbol Settings and
Status Logic
The SEL-751 supports one breaker that can be controlled and monitored via
the bay screen. Use the SEL
OGIC settings 52A and 52B to map the respective
breaker auxiliary contacts to the relay. Because the 52B contact is not always
available in all applications, the breaker status logic does not include the 52B
contact. The relay uses the 52A Relay Word bit as the status of the breaker in
conjunction with the protection elements and trip and close logic. The default
setting for 52B is NOT 52A. Map 52A and 52B Relay Word bits to the
settings associated with the breaker symbol under the Bay Control settings in
QuickSet to display the status of the breaker on the bay screen.
Use SEL
OGIC to create dual-point status of the breaker with breaker alarm
indication. Refer to Table 9 .5 for the Bay Control breaker settings. Refer to
Bay Control Application Example on page 9.13 for example settings. Refer to
Table 4.52 and 52A and 52B Breaker Status SEL
OGIC Control Equations on
page 4.130 for 52A and 52B settings and descriptions. Refer to Trip/Close
Logic on page 4.128 for more information on the breaker trip and close logic.
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