- Comprehensive
and Secure Distance Protection
Four zones of phase and ground mho elements plus four zones ground distance
quadrilateral elements,each reversible,with independent phase and ground
timers for complete distance protection. Positive-sequence memory voltage
polarization with long memory time constant for three-phase fault directional
security. Negative-sequence impedance directional element polarization for
sensitive and secure operation during unbalanced faults.
- Extensive
Supplemental Protection Elements and Logic
Four residual and negative-sequence overcurrent elements with negative-sequence
directional control. Phase,sequence,and ground time-overcurrent elements
for backup protection. Out-of-step elements for power swing blocking and
tripping. Phase and sequence under-and overvoltage elements. Load encroachment
logic to protect against false operations during heavy load conditions. Single-pole
tripping logic. Built-in communications-assisted tripping scheme logic. SELOGIC® control
equations for custom scheme logic.
- Multiple
Settings Groups
Six settings groups,for maximum protection scheme flexibility, allow application
with bus-tie breakers or for remote system reconfiguration.
- Fault Locating
Use the built-in fault locator to efficiently dispatch line inspection and
repair personnel.
- Communications
Patented MIRRORED BITS® Communications
and communications-assisted tripping schemes.
- Chassis available
for one additional interface I/O board.
- I/O boards with
contact sensing inputs and standard control outputs, high-current
interrupting outputs,or high-speed,high-current interrupting outputs. Connectorized® (plug-in
connectors).Vertical or horizontal,panel-mount or rack-mount hardware
packages (panel-mount available in Connectorized version only).
- Extra long time
event reports, including oscillography, available in the SEL-321-2
Relay.
|
- Apply the SEL-321
Relay for primary and/or backup single-or three-pole trip transmission
line protection,including series-compensated lines.
- Use the advanced
single-pole tripping logic with phase selection, open-pole interval
protection,and phase discordance logic with three-pole trip to
protect against excessive single-pole-open events.
- Choose from
among the many communications-assisted tripping schemes available
(POTT, DCUB, DCB, PUTT, DUTT, and DTT) including unique MIRRORED BITS communications.
- Select the load-encroachment
feature to prevent operation of three-phase elements under high
load conditions.
- Use the time-overcurrent
elements to provide current-dependent, time-delayed fault detection
along the protected line and backup protection for remote terminals.
- Use weak-infeed
logic to rapidly clear both line terminals for internal faults
near the weak terminal.
- Select the SEL-321-5
Relay for enhanced performance on 50 Hz systems, including single-pole
tripping.
- Use SEL-5040
Power System Report Manager Software to automatically gather
relay event reports on your PC and manage them with a database.
- Use SEL-5010
Relay Assistant Software to manage your relay settings.
- Use SEL-5601
Analytic Assistant Software to display oscillograms and vector
diagrams to analyze event reports.
Budgetary
Retail, Quantity 1: $5,250
Fully Optioned Price: $9,190
(Prices displayed are for planning purposes and are subject
to change. Contact your SEL sales representative today
for a quote on configurations and quantities to meet your needs.)
 |
