Howard HI-104 Single-Phase Pad Transformer User Manual
Page 3
Document 2.4.96, Revision 0
March, 2013
3
Single-Phase Pad-Mounted Compartmental-Type Distribution Transformers
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 Level .................................................................................................................................................................. 7
Internal Inspection ................................................................................................................................................... 8
Fluid Sampling ........................................................................................................................................................... 8
Transformer Storage ................................................................................................................................................ 8
SECTION 3: INSTALLATION ............................................................................................................................................ 9
Lifting and Handling ................................................................................................................................................. 9
Jacking, Skidding and Rolling .................................................................................................................................. 9
Location and Mounting ............................................................................................................................................ 9
Verifying Enclosure Integrity ................................................................................................................................... 10
Grounding ................................................................................................................................................................ 10
High-Voltage and Low-Voltage Connections .......................................................................................................... 10
High-Voltage Terminals ........................................................................................................................................... 10
Low-Voltage Terminals ............................................................................................................................................ 11
SECTION 4: INSPECTION AND TESTING BEFORE AND AFTER INITIAL ENERGIZATION ......................................12
Pre-Energization Inspection and Tests .................................................................................................................. 12
Ratio Test ................................................................................................................................................................. 12
Insulation Resistance Test...................................................................................................................................... 12
Tap Changer Setting. ............................................................................................................................................... 12
Multiple-Voltage Switch Setting .............................................................................................................................. 12
Grounding ................................................................................................................................................................ 12
Bolted Connections. ................................................................................................................................................ 12
Fluid Level ................................................................................................................................................................ 12
Fluid Temperature ................................................................................................................................................... 13
Internal Fault Detector ............................................................................................................................................ 13
Current Transformers. ............................................................................................................................................. 13
Accessory Wiring ..................................................................................................................................................... 13
Tank Finish .............................................................................................................................................................. 13
Tools ......................................................................................................................................................................... 13
Internal Inspection .................................................................................................................................................. 13
Post-Energization Inspection and Tests ................................................................................................................. 13
Verifying Correct Voltage ......................................................................................................................................... 13
Checking for Leaks. ................................................................................................................................................. 14
Observing Operation ............................................................................................................................................... 14
Checking Gauges .................................................................................................................................................... 14
Audible Sound ......................................................................................................................................................... 14
Locking the Terminal Compartment ...................................................................................................................... 14
SECTION 5: OPERATION OF SWITCHING AND PROTECTIVE DEVICES ...................................................................15
Hot-Stick Operable Devices .................................................................................................................................... 16
Tap Changer ............................................................................................................................................................ 16
Multiple-Voltage Switch .......................................................................................................................................... 16
Load-Break Switch .................................................................................................................................................. 16
Fuses ..........................................................................................................................................................................................17