SEL-352 Breaker Failure Relay

Products for Protection, Monitoring, Control, Automation, and Metering

SEL-352

Breaker Failure Relay

Provide comprehensive protection and unparalleled flexibility for breaker failure applications using the SEL-352 Relay.

Comprehensive Breaker Failure Protection
Circuit breaker failure protection including failure to trip for fault or load conditions; failure to close, including pole disagreement; failure while open (flashover detection); failure to complete a trip or close due to stuck resistor switches; and loss of dielectric pressure. Five built-in schemes can be modified with SELOGIC^® control equations for application flexibility. Trip failure schemes accommodate single and multiple breaker applications, single-pole closing, and tripping applications. Overcurrent fault detection element includes unique subsidence current detection logic to provide fast reset after the breaker opens.
Complete Breaker Control
Circuit breaker control features including Motor-Operated Disconnect (MOD) trip and power circuit breaker isolation security logic, retripping, point-on-wave and staggered phase closing, synchronism checking, and trapped-charge polarity detection for sophisticated breaker control. extensive SELOGIC control Equation tools to enable custom automatic reclosing schemes.
Data Recording
Data recording features include up to ten 60-cycle oscillographic event reports (64 samples/cycle), up to 512 Sequential Events Recorder (SER) reports, breaker trip and close monitor details, and summary of electrical and mechanical operating times. Breaker contact wear monitor on per-phase basis. All data stored in nonvolatile memory.

Panel-mount or rack-mount hardware package.
Chassis available for one or two additional I/O boards.
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).
Breaker interrupting contact wear monitor, for each phase.
Distributed Network Protocol (DNP) 3 Level 2 Slave communications protocol available for the SEL-352-2 model.

Apply one SEL-352 Relay per circuit breaker to detect breaker failure conditions for single-pole and three-pole tripping applications with any bus/breaker arrangement.
Minimize total breaker failure fault clearing time with reduced timing margins made possible by subsidence current detection logic and optional fast output contacts.
Implement point-on-wave closing with trapped-charge polarity detection and synchronism checking to minimize system voltage transients when closing breaker.
Use control logic to minimize breaker wear by closing at optimum times.
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.

SEL provides options to help you efficiently and safely commission and test these relays.
	When access to the back of panels and cabinets is allowed, use a Connectorized^® version of this relay for fast installation and testing.

Budgetary Retail, Quantity 1: $3,570
Fully Optioned Price: $5,915
(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.)