Howard HI-102 Overhead Transformer - Manual (Page 3)

Document 2.4.95, Revision 0
May, 2013
3
Fluid-Filled Overhead Distribution Transformers
TABLE OF CONTENTS
IMPORTANT SAFETY INFORMATION ................................................................................................................................2
SECTION 1: INTRODUCTION ..............................................................................................................................................5
SECTION 2: RECEIVING, HANDLING, AND STORAGE .....................................................................................................6
Drawings and Documents ...........................................................................................................................................6
Lifting and Handling .....................................................................................................................................................6
Initial Inspection ............................................................................................................................................................6
Fluid Level ......................................................................................................................................................................7
Internal Inspection .......................................................................................................................................................7
Fluid Sampling ...............................................................................................................................................................7
Transformer Storage ....................................................................................................................................................7
SECTION 3: INSTALLATION ................................................................................................................................................9
Lifting and Handling .....................................................................................................................................................9
Location and Mounting ................................................................................................................................................9
Grounding ....................................................................................................................................................................10
High-Voltage and Low-Voltage Connections ..............................................................................................................10
Reconfiguring the Internal Low-Voltage Connections ...............................................................................................10
SECTION 4: INSPECTION AND TESTING .........................................................................................................................11
Pre-Energization Inspection and Tests ......................................................................................................................11
Ratio Test .....................................................................................................................................................................11
Insulation Resistance Test..........................................................................................................................................11
Multiple-Voltage Switch Setting ..................................................................................................................................11
Tap Switch Setting .......................................................................................................................................................11
Grounding ....................................................................................................................................................................12
Bolted Connections. ....................................................................................................................................................12
Fluid Level ....................................................................................................................................................................12
Fluid Temperature .......................................................................................................................................................12
Internal Fault Detector ................................................................................................................................................12
Current Transformers. .................................................................................................................................................12
Accessory Wiring .........................................................................................................................................................12
Tank Finish ..................................................................................................................................................................12
Internal Inspection ......................................................................................................................................................12
Post-Energization Inspection and Tests .....................................................................................................................12
Verifying Correct Voltage .............................................................................................................................................12
Checking for Leaks. .....................................................................................................................................................13
Observing Operation ...................................................................................................................................................13
Checking Gauges ........................................................................................................................................................13
Audible Sound .............................................................................................................................................................13
SECTION 5: OPERATION OF SWITCHING AND PROTECTIVE DEVICES .......................................................................14
Hot-Stick Operable Devices ........................................................................................................................................14
Taps and Multiple-Voltage Windings ..........................................................................................................................14
Tap Switch....................................................................................................................................................................15
Multiple-Voltage Switch ..............................................................................................................................................15
Fuses ...........................................................................................................................................................................15
Internal Weak-Link Fuse .............................................................................................................................................16
Partial-Range Current-Limiting Fuse ..........................................................................................................................16