Howard HI-110 Network Transformer - Manual (Page 3)

Document 2.4.128, Revision 2
August, 2012
3
Network Transformer Instruction Manual
Table of Contents
SECTION 1: INTRODUCTION .............................................................................................................................5
SECTION 2: RECEIVING, HANDLING AND STORAGE ......................................................................................6
Drawings and Documents ...............................................................................................................................6
Lifting and Handling .........................................................................................................................................6
Initial Inspection ................................................................................................................................................6
Fluid Levels ........................................................................................................................................................7
Internal Inspection ...........................................................................................................................................7
Fluid Sampling ...................................................................................................................................................7
Transformer Storage ........................................................................................................................................7
SECTION 3: INSTALLATION ...............................................................................................................................9
Lifting and Handling .........................................................................................................................................9
Jacking ...............................................................................................................................................................9
Location and Mounting ....................................................................................................................................9
Grounding ........................................................................................................................................................10
Primary and Secondary Connections ............................................................................................................10
Primary Connections .......................................................................................................................................10
Secondary Connections ..................................................................................................................................10
SECTION 4: INSPECTION AND TESTING ....................................................................................................... 11
Pre-Energization Inspection and Tests ......................................................................................................... 11
Continuity and Winding Resistance Test ...................................................................................................... 11
Ratio Test ........................................................................................................................................................ 11
Insulation Resistance Test............................................................................................................................. 11
Tap Changer Setting ....................................................................................................................................... 12
Series/Multiple and Delta/Wye Switch Settings .......................................................................................... 12
Grounding ....................................................................................................................................................... 12
Bolted Connections ........................................................................................................................................ 12
Fluid Levels ..................................................................................................................................................... 12
Fluid Temperature .......................................................................................................................................... 12
Current Transformers ..................................................................................................................................... 12
Accessory Wiring ............................................................................................................................................ 12
Tank Finish...................................................................................................................................................... 12
Tools ................................................................................................................................................................ 12
Internal Inspection ......................................................................................................................................... 12
Post-Energization Inspection and Tests ........................................................................................................ 13
Verifying Correct Voltage ................................................................................................................................ 13
Checking for Leaks ......................................................................................................................................... 13
Observing Operation ...................................................................................................................................... 13
Checking Gauges ........................................................................................................................................... 13
Audible Sound ................................................................................................................................................ 13