![background image](http://html.mh-extra.com/html/beckwith-electric/m-0420/m-0420_instruction-book_2719823001.webp)
i
TABLE OF CONTENTS
TABLE OF CONTENTS
M-0420 Multifunction Relay
Instruction Book
Chapter 1
Introduction
1.1
Foreword ................................................................................................ 1–1
1.2
Before You Begin ................................................................................... 1–2
1.3
Configuration As Shipped ...................................................................... 1–2
1.4
Description ............................................................................................. 1–3
1.5
Design Considerations ........................................................................... 1–5
1.6
User Considerations .............................................................................. 1–7
1.7
Options ................................................................................................... 1–8
1.8
Accessories ............................................................................................ 1–9
1.9
References ............................................................................................. 1–9
Chapter 2
Application
2.1
Protective Applications .......................................................................... 2–1
Islanding Protection (81U, 81O, 27, 59) ............................................... 2–1
Ferroresonance Protection (59I) ........................................................... 2–1
Utility-Side Ground Fault Protection and Phase Voltage
Unbalance Protection (27N, 59N) ......................................................... 2–2
Phase Fault Protection (51V, 67) .......................................................... 2–2
Directional Power (32F, 32R) ................................................................ 2–2
Anti-Motoring Protection (32R) .............................................................. 2–2
Ground Fault Protection (59N, 51N, 50N) ............................................ 2–2
Negative Sequence Overcurrent Protection (46) ................................. 2–3
Backup Phase Fault Protection (51VC/VR) .......................................... 2–3
VT Fuse-Loss Protection (60FL) ........................................................... 2–3
Power OK Status ................................................................................... 2–3
2.2
Trip Configuration vs. Applications ....................................................... 2–3
2.3
Intertie Protection ................................................................................... 2–4
2.4
Generator Protection .............................................................................. 2–7
2.5
Setpoints ............................................................................................... 2–11
2.6
Functions .............................................................................................. 2–12
81O/81U
Over Frequency/Under Frequency ................................... 2–12
59/27
Overvoltage/Undervoltage ...................................................... 2–13
59I
Peak Overvoltage ........................................................................ 2–14
Summary of Contents for M-0420
Page 56: ...M 0420 Instruction Book 3 4 This Page Intentionally Left Blank ...
Page 92: ...M 0420 Instruction Book 5 28 This Page Left Intentionally Blank ...
Page 156: ...A 8 M 0420 Instruction Book This Page Intentionally Left Blank ...
Page 160: ...B 4 M 0420 Instruction Book This Page Intentionally Left Blank ...
Page 164: ...C 4 M 0420 Instruction Book This Page Intentionally Left Blank ...
Page 166: ...D 2 M 0420 Instruction Book This Page Intentionally Left Blank ...
Page 174: ...E 8 M 0420 Instruction Book This Page Intentionally Left Blank ...