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Howard Industries
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HI-105
Howard Industries HI-105 User Manual
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Document 2.4.
126, Re
vision 4
October 20
1
7
1
Three-Phase P
admount
ed Distribution T
ransf
ormer
s
How
ard Industries
Distribution T
ransformer Division
Instructions
(HI-1
05)
Installation, Operation, and Maint
enance
of Three-Phase Padmount
ed Distribution T
ransf
ormer
s
45 kV
A thr
ough 1
0,000 kV
A
2
Table of Contents
Important Safety Information
2
Table of Contents
3
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
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 Connections
10
Low-Voltage Connections
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
Series/Multiple or Delta/Wye Switch Settings
13
Grounding
13
Bolted Connections
13
Fluid Level
13
Fluid Temperature
13
Internal Fault Detector
13
Current Transformers
13
Accessory Wiring
13
Tank Finish
13
Tools
13
Post-Energization Inspection and Tests
14
Verifying Correct Voltage
14
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
Tap Changer
15
Series/Multiple or Delta/Wye Switch
16
Load-Break Switch
16
Fuses
16
Internal Weak-Link Cartridge Fuse
17
Bay-O-Net Fuse
17
Dead-Break Dry-Well Canister Fuse
18
Internal Partial-Range Current-Limiting Fuse
19
S&C Arc-Strangler
19
Vacuum Fault Interrupter
19
S&C Fused Switch
19
Surge Arresters
20
Internal MOV Surge Arresters
20
Molded-Case Circuit Breakers
21
Hot-Stick Operable Devices
21
Other Switching and Fusing Devices
21
Section 6: Operation of Bushings, Gauges and Accessory Devices
22
Pressure-Vacuum Gauge
22
Fluid Level Gauge and Sight Plug
22
Fluid Temperature Gauge
22
Drain Valve and Sampling Device
22
Automatic Pressure Relief Device
23
Internal Fault Detector
23
High-Voltage Bushings
23
Low-Voltage Bushings
24
Current Transformers
24
Accessory Brackets
24
Flip-Top Terminal Compartment Cover
24
Door Handle, Padlock and Security Bolt
24
Lift-Off Door Hinges
24
Other Accessory Devices
24
Section 7: Maintenance
25
Periodic Inspection
25
Inspection Checklist
26
Electrical Tests
27
Exterior Paint Finish
28
Fluid Leaks
28
Audible Sound Level
28
Molded-Case Circuit Breakers
29
Other Accessory Devices
29
Sampling and Testing the Fluid
29
Filtering the Fluid
29
Removing or Lowering the Fluid
29
Filling with Fluid
29
Opening the Transformer Tank
30
Torque Guidelines
31
Additional Maintenance Instructions
33
Repair Parts
33
Warranty Claims
33
Transformer Disposal
33
4
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Howard Industries HI-105 Specifications
General
Brand
Howard Industries
Model
HI-105
Category
Transformer
Language
English
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