ELM USER MANUAL ISSUE 4
CONTENTS
1.
Protection Systems
................... 1
2.
The Need for Earth Leakage
Protection
...................................... 1
2.1 Earth Leakage Systems ............... 2
2.2 Methods of Earth leakage
Protection .................................... 2
2.3 Core Balance Protection ............. 2
2.4 Series Neutral Protection ............ 2
2.5 Earth Leakage Toroids ................ 3
2.6 Toroid Selection .......................... 3
2.7 Toroid Installation Guidelines .... 3
3.
ELM Earth Leakage Relay
3.1
Description .................................. 4
3.2
Methods of Earth Leakage
Protection .................................... 4
3.3
Testing Procedure ....................... 4
3.4
Toroids ........................................ 4
3.5
Mode of Operation ...................... 4
4.
Specifications
.............................. 5
5.
Equipment List
............................ 5
6.
Diagrams
ELM Typical Installation Diagram ...... 6
Core Balance E/L System .................... 7
Series Neutral E/L System ................... 8
Mounting Details .................................. 9