Schweitzer Engineering Laboratories SEL-351 - Table of Contents

Date Code 20001006 Introduction and Specifications i
SEL-351 Instruction Manual
TABLE OF CONTENTS
SECTION 1: INTRODUCTION AND SPECIFICATIONS .......................... 1-1
SEL-351 Relay Models.............................................................................................................1-1
Instruction Manual Sections Overview......................................................................................1-3
Applications.............................................................................................................................1-7
Hardware Connection Features .................................................................................................1-8
Communications Connections .................................................................................................1-12
General Specifications ............................................................................................................1-13
Processing Specifications ................................................................................................1-17
Relay Element Pickup Ranges and Accuracies.................................................................1-17
Instantaneous/Definite-Time Overcurrent Elements ..................................................1-17
Time-Overcurrent Elements .....................................................................................1-18
Under- and Overvoltage Elements ............................................................................1-18
Synchronism-Check Elements..................................................................................1-18
Under- and Overfrequency Elements ........................................................................1-19
Timers............................................................................................................................1-19
Substation Battery Voltage Monitor ................................................................................1-19
Metering Accuracy..........................................................................................................1-19
Power Element Accuracy ................................................................................................1-20
TABLES
Table 1.1: SEL-351 Relay Models.....................................................................................................1-1
Table 1.2: SEL-351 Firmware Versions.............................................................................................1-3
FIGURES
Figure 1.1: SEL-351 Relays Applied Throughout the Power System....................................................1-7
Figure 1.2: SEL-351 Relay Inputs, Outputs, and Communications Ports (Model 0351xT) ...................1-8
Figure 1.3: SEL-351 Relay Inputs, Outputs, and Communications Ports (Models 0351x0,
0351x1, and 0351xY; Models 0351x1 and 0351xY Have an Extra I/O Board –
See Next 2 Figures)....................................................................................................1-9
Figure 1.4: SEL-351 Relay Extra I/O Board (Model 0351xY, Plug-In Connector Version; Main
Board Shown in Figure 1.3)......................................................................................1-10
Figure 1.5: SEL-351 Relay Extra I/O Board (Model 0351x1, Screw-Terminal Block Version;
Main Board Shown in Figure 1.3).............................................................................1-11
Figure 1.6: SEL-351 Relay Communications Connections Examples.................................................1-12
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