1-4
Introduction and Specifications
Date Code 20010731
SEL-352-1, -2 Instruction Manual
Independent phase current detectors, protection logic, and timers make the relay easy to apply on
both simple systems and more complicated breaker arrangements such as single-pole trip
installations.
The SEL-352 Relay stores summaries of the last 512 breaker operations in nonvolatile memory.
Event type, maximum current, mechanical and electrical operating times, and breaker energy are
stored along with the date and time of operation. Using this breaker history, you can monitor
breaker wear and effectively schedule routine breaker maintenance.
When a motor-operated disconnect switch (MOD) is used with the protected breaker, the
SEL-352 Relay can trip the MOD to isolate the failed breaker when phase current drops below a
value the user can set. When an MOD is not installed, use the MOD logic to indicate a “Safe to
Disconnect” condition to personnel.
The relay also includes SEL
OGIC
control equations, which allow you to configure the
programmable outputs to operate when any of the protective elements pick up. You can
implement complete application-specific protective schemes with a minimum of wiring and panel
space. SEL
OGIC
control equations also simplify relay testing.
Control Features
Control logic provides flexibility for closing and tripping. For minimal breaker wear, the
SEL-352 Relay can be used to close the breaker at an optimum time. Close using a simple pole-
staggered close or use complete control by monitoring synchronism, trapped charge polarity, and
zero crossings. Control breaker tripping through lockout and reset conditions, instantaneous
retripping, and time-delayed retripping.
Use the flexible SEL
OGIC
control equations to create your own recloser, implement manual
closing supervision, and/or change existing control logic to meet your needs.
Data Recording
A wide range of user-selectable events trigger the sequential events recording (SER) and digital
fault recording (DFR) functions, including any input or output assertion. Breaker Failure Trip
(86BFT) output assertion automatically generates a DFR record, and you can set the relay to
trigger an event for CLOSE or TRIP input assertions. This ensures a record of every normal
circuit breaker operation as well as every circuit breaker failure.
The recorded data contain all information needed to determine the cause of relay and breaker
operations. The data collected include current through the circuit breaker, voltage on both sides
of the circuit breaker, input, output, and relay element data. Parameters such as event type, relay
response time, circuit breaker operation time, currents, voltages, and breaker power dissipation
appear directly in the breaker monitor report or can be calculated from the data stored. All event
reports are time-tagged by a self-contained clock/calendar.
Additional Features
Additional features make the SEL-352 Relay reliable and economical. The communication
functions provide remote and local examination of a wide range of data, including the voltages
and currents presented to the instrument, relay settings, history of events, breaker alarms,
sequential events, and self-test status data. You can enter and modify relay settings remotely; you
can also control all outputs via the communications channel.
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