Date Code 20060320 Instruction Manual SEL-311C Relay
Preface
Manual Overview
The SEL-311C Relay Instruction Manual describes common aspects of relay
application and use. It includes the necessary information to install, set, test,
and operate the relay and more detailed information about settings and
commands.
An overview of each manual section and topics follows:
Preface. Describes the manual organization and conventions used to
present information.
Section 1: Introduction & Specifications. Introduces SEL-311C features,
options, and accessories. In addition, this section summarizes relay
functions and applications, and it lists relay specifications, type tests,
and ratings.
Section 2: Installation. Describes mounting and wiring the SEL-311C,
application connections, and the operation of circuit board jumpers.
Figure 2.2–Figure 2.11 show the SEL-311C front and rear panels.
Section 3: Distance, Out-of-Step, Overcurrent, Voltage, Synchronism
Check, and Frequency Elements.
Describes the operation of the following:
➤ Phase and ground distance elements (phase mho, compensator
distance, ground mho, quadrilateral ground, and Zone 1
extension)
➤ Out-of-step elements
➤ Instantaneous/definite-time overcurrent elements (phase,
residual ground, and negative-sequence)
➤ Time-overcurrent elements (phase, residual ground, and
negative-sequence)
➤ Voltage elements (single-phase, phase-to-phase, etc.)
➤ Synchronism check elements
➤ Frequency elements
Section 4: Loss-of-Potential, CCVT Transient Detection, Load-Encroach-
ment, and Directional Element Logic.
Describes the operation of the
following:
➤ Loss-of-potential logic and its effect on distance and directional
elements
➤ CCVT transient detection logic and its effect on Zone 1
distance elements
➤ Load-encroachment logic and its application to phase distance
and overcurrent elements
➤ Voltage-polarized and current-polarized directional elements
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