Sel -451-6 Manual

SEL-451-6 Protection, Automation,
and Bay Control System
Protection, Automation, and Bay Control
System With Sampled Values or TiDL
Key Features and Benefits
The SEL-451-6 Protection, Automation, and Bay Control System With Sampled Values or TiDL
bay control for breakers and disconnect switches with full automation and protection in one device.
➤
High-Impedance Fault (HIF) Detection. The optional HIF detection element operates for small current ground
faults typically caused by downed conductors on surfaces such as earth, concrete or other poorly conductive
materials. HIF event data are made available in standard COMTRADE format.
➤
Synchronism Check. Synchronism check can prevent circuit breakers from closing if the corresponding phases
across the open circuit breaker are excessively out of phase, magnitude, or frequency. The synchronism-check
function has a user-selectable synchronizing voltage source and incorporates slip frequency, two levels of maximum
angle difference, and breaker close time into the closing decision.
➤
Reclosing. You can incorporate programmable reclosing of one or two breakers into an integrated substation
control system. Synchronism and voltage checks from multiple sources provide complete bay control.
➤
Fault Locator. Utilities can efficiently dispatch line crews to quickly isolate line problems and restore service
faster.
➤
Dual CT Input. You can combine currents within the relay from two sets of CTs for protection functions, but keep
them separately available for monitoring and station integration applications.
➤
Primary Potential Redundancy. Multiple voltage inputs to the relay provide primary voltage input redundancy.
Upon loss-of-potential (LOP) detection, the relay can use inputs from an electrically equivalent source connected
to the relay.
➤
Low-Energy Analog (LEA) Inputs. As many as six IEEE C37.92-compliant LEA voltage inputs can reduce costs
and save space.
Schweitzer Engineering Laboratories, Inc.
Technology
®
Technology integrates
SEL-451-6 Data Sheet