IEEE C57.93-2007 pdf free.IEEE Guide for Installation and Maintenance of Liquid-Immersed Power Transformers.
The recommendations presented in this guide apply to the shipping, handling. inspection, 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: guide does cover special transformers such as furnace transformers, rectifier transformers. çjç.. Distinctions made as required for various MVA tings, voltage ratings, and types f liquid insulation.
Clause 3 contains information for use with transformers rated below 10 MVA with high voltages less than 69 kV. Clause 4 applies to transformers rated 10 MVA and above with primary voltages of 69 kV and above, including EHV transformers.
NOTE I For transformers with primary voltages that are less than 69 kV and larger than 10 MVA, users should follow Clause 41
NOTF 2 The user should careftilly read the instruction book supplied by the manufacturer. Any conflict with this guide that may occur should be resolved with thc manufacturer for each specific installation.
2. Normative references
The following referenced documents indispensable application f hj document (i.e., thy must understood 4 used. each referenced document cited relationship thIs document explained). f dated references, only thc edition cited applies. undated references, the latest edition of the referenced document (including gy amendments corrigenda) applies.
3.1 General
In general, these transformers can be either of the station or pad-mount configuration and may have load tap changing (LTC) equipment. They normally have scaled liquid or inert gas insulation preservation systems, and may have draw-lead-type high-voltage and bottom-connected low-voltage bushings. The radiators (if provided) may be welded directly to the tank
For outdoor applications, the insulating liquid normally is conventional mineral oil synthetic jj. For special applications, or for use indoors, they may contain less flammable or non-flammable biodegradable liquids.Forced cooling (it’ present) normally uses fans.IEEE C57.93 pdf free downlaod.