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Date Code 20011205
Introduction and Specifications
1-1
SEL-311B Instruction Manual
SECTION 1: INTRODUCTION AND SPECIFICATIONS
This section includes the following overviews of the SEL-311B Relay:
SEL-311B Relay Models
Instruction Manual Sections
Applications
AC/DC Connections
Communications Connections
General Specifications
SEL-311B R
ELAY
M
ODELS
This instruction manual covers all SEL-311B Relay models.
The SEL-311B Relay is available as a horizontal rack-mount unit, and as a horizontal or vertical
panel-mount unit. The vertical relays use the same rear panels as the horizontal models in
Figure 2.2 through Figure 2.4.
I
NSTRUCTION
M
ANUAL
S
ECTIONS
O
VERVIEW
The following is an overview of the other sections in this instruction manual.
Section 2: Installation
describes mounting and wiring the SEL-311B Relay, application
connections, and the operation of circuit board jumpers. Figure 2.2 through Figure 2.4 show the
SEL-311B Relay front and rear panels.
Section 3: Distance, Overcurrent, Voltage, and Synchronism Check Elements
describes the
operation of:
·
Phase and ground distance elements (phase mho, ground mho, and Zone 1
extension)
·
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
Section 4: Loss-of-Potential, CCVT Transient Detection, Load-Encroachment, and
Directional Element Logic
describes the operation of:
·
Loss-of-potential logic and its effect on distance and directional elements
·
CCVT transient detection logic and its effect on Zone 1 distance elements
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