IEEE C57.93 2008

$46.04

IEEE Guide for Installation and Maintenance of Liquid-Immersed Power Transformers

Published By	Publication Date	Number of Pages
IEEE	2008	61

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Description

Revision Standard – Active. This guide provides guidance and recommended practices on the installation and maintenance of liquid-immersed power transformers rated 501 kVA and above with secondary voltages of 1000 V and above. This guide covers the entire range of power transformers, including extra high voltage (EHV) transformers. This guide does not cover special transformers such as furnace transformers, rectifier transformers etc. Distinctions are made as required for various MVA ratings, voltage ratings, and types of liquid insulation.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std C57.93-2007
3	IEEE Guide for Installation and Maintenance of Liquid-Immersed Power Transformers
6	Introduction Notice to users Laws and regulations Copyrights
7	Updating of IEEE documents Errata Interpretations Patents Participants
10	CONTENTS
11	1. Scope 2. Normative references
12	3. Liquid-immersed power transformers rated 501 kVA to 10 MVA, or with primary windings less than 69 kV 3.1 General 3.2 Inspection and receipt
13	3.2.1 Station-type configuration 3.2.2 Pad-mount configuration 3.3 Internal inspection
14	3.3.1 General practices for internal inspection
15	3.3.2 Atmospheric conditions 3.3.3 Inspection 3.4 Handling
16	3.4.1 Pad-mount configuration 3.5 Assembly 3.6 Storage
17	3.7 Tests 3.7.1 Pad-mount configuration 3.7.2 Hydrocarbon-based insulating oils (conventional and less flammable) 3.7.3 Other insulating liquids 3.8 Energization
18	3.8.1 Connections 3.8.2 Connecting to bushings 3.8.3 Energization under cold conditions
19	3.9 Maintenance 3.9.1 Routine DGA testing 3.9.2 External inspection External inspection should be carried out regularly and at least four times annually.
20	4. Liquid-immersed power transformers rated 10 MVA and above or with high-voltage windings 69 kV and above 4.1 General 4.2 Shipping 4.2.1 General
21	4.2.2 Shipping terminology 4.2.3 Railroad shipments
23	4.2.4 Truck shipments 4.2.5 Water shipment
24	4.3 Inspection and receipt 4.3.1 External, prior to unloading
25	4.3.2 Internal, prior to unloading 4.4 Internal inspection 4.4.1 Atmospheric conditions 4.4.2 Inspection
26	4.5 Handling 4.5.1 Complete transformer 4.5.2 Lifting with slings
27	4.5.3 Raising with jacks 4.6 Anchorage 4.7 Assembly 4.7.1 General 4.7.2 Bushings
28	4.7.3 Heat exchangers and piping 4.7.4 Other accessories 4.7.5 Controls systems
29	4.8 Vacuum treatment 4.8.1 Preparation
30	4.8.2 Vacuum treatment 4.8.3 Vacuum leakage tests
32	4.8.4 Processing dielectric liquid
33	4.8.5 Vacuum filling
34	4.9 Field drying of insulation 4.9.1 Method 1—Circulating hot oil
35	4.9.2 Method 2—High vacuum (with or without hot oil circulation)
36	4.9.3 Method 3—Hot air 4.9.4 Completion of drying
37	4.10 Reprocessing 4.10.1 Considerations for reprocessing
38	4.10.2 Methodology for reprocessing and absorption
40	4.11 Tests after the transformer has been assembled and filled with dielectric liquid 4.12 Energization
42	4.13 Maintenance 4.13.1 Maintenance intervals for transformers
44	4.13.2 Maintenance intervals for transformer load-tap-changing (LTC) equipment
46	4.13.3 Final “maintenance”—disposal 4.14 Storage guidelines
47	4.14.1 Storage of main transformer
49	4.14.2 Storage of transformer accessories and components
50	Annex A (informative) Bibliography
52	Annex B (informative) Figures and table
57	Annex C (informative) Field equipment for oil-filling EHV transformers and determination of insulation dryness C.1.1 Oil-processing equipment (preferably an integrated trailer unit) C.1.2 Vacuum pumps C.1.3 Dry gas C.1.4 Test equipment
58	C.2.1 Moisture determination of cellulose insulation
60	C.2.2 Moisture determination of transformer oil