Date Code 20010731 Introduction and Specifications 1-1
SEL-352-1, -2 Instruction Manual
SECTION 1: INTRODUCTION AND SPECIFICATIONS
INTRODUCTION
The SEL-352 Relay is a single- or three-pole breaker failure detection, breaker control, and data
recording device. Each of the protection schemes is implemented in SEL
OGIC
®
control equations,
giving relay engineers unparalleled flexibility in adapting the relay to their needs. The relay
provides classical overcurrent-based breaker failure protection for a wide variety of breaker
arrangements. Additionally, protection is provided for circuit breaker trip and close resistors, for
current through an open breaker, and for breaker flashover.
Logic to control the closing of the circuit breaker is also included. Additional features include
metering, sequential events reporting, digital fault recording, remote setting capabilities, breaker
operating time monitors, energy interruption monitors, and breaker resistor thermal protection.
Simple hardware design and efficient digital signal processing provide reliability. Extensive self-
testing and communication capabilities enhance availability.
Figure 1.1 shows a single-phase diagram of the ac connections. All nine connections are not
required for most relay functions.
Figure 1.1: Single-Phase Diagram of AC Inputs to the Relay
INSTRUCTION MANUAL OVERVIEW
This instruction manual applies to the SEL-352 Relay. If you are unfamiliar with this relay, we
suggest that you read the following sections in the outlined order.
Section 1: Introduction and Specifications for an introduction, instruction manual overview,
relay functional overview, and specifications.
Section 3: Breaker Logic to learn about predefined SEL-352 Relay logic schemes that provide
protection against several types of circuit breaker failure.
Section 4: Close Logic to understand use of the SEL-352 Relay in implementing automatic and
manual circuit breaker closing.
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