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IEEE C57.13-2008 pdf free

IEEE C57.13-2008 pdf free.IEEE Standard Requirements for Instrument Transformers.
IEEE C57.13 is intended for use as a basis for perfonnance and interchangeability of equipment covered, and to assist in the proper selection of such equipment. Safety precautions are also addressed.
This standard covers certain electrical, dimensional, and mechanical characteristics, and takes into consideration certain safety features of current and inductively coupled voltage transfonners of types generally used in the measurement of electricity and the control of equipment associated with the generation. transmission, and distribution of alternating current.
1.2 Purpose
The purpose of this standard is to provide the performance requirements for electrical system and test interchangeability of current and inductively coupled voltage transfonners. These transformers are for both indoor and outdoor application.
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e, they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
3. Definitions
For the purposes of this document, the following terms and definitions apply. The Mahoriiaiive Dkiionari’ of IEEE Siamkzrdc Terms [B3O] should be referenced for terms not defined in this clause.
3.1 indoor oltage transformer: One that, because of its construction, must be protected from the weather.
3.2 split-core current transformer: One that has a secondary winding insulated from and permanently assembled on the core but has no priinaiy winding as an integral part of the structure. This type of core can be opened or separated such that it can be placed ovcr a primary conductor and reattachcd and secured. It shall have a minimum insulation for the 2.5 kV applied test, and it may or may not be fully rated for the primary voltage This type is primarily used as a temporary or permanent installation where it is not practical to break the primary conductor.
4. General requirements
4.1 Service conditions
4.1.1 Usual temperature and altitude service conditions
Instrument transformers conforming to this standard shall be suitable for operation at their thermal ratings. provided that the altitude does not cxceed 1000 m. 30 °C average ambient temperature
If the transformers are air cooled, the ambient temperature of’ the cooling air does not exceed 40°C and the average ambient temperature olthc cooling air for any 24-h period does not exceed 30 OC.Ô
The minimum ambient air temperature is —30 °C. 55 °C average ambient temperature
instrument transformers may also be given ratings for operation in 55 °C average ambient temperature. wih maximum ambient air temperature not exceeding 65°c.
4.1.2 Unusual temperature and altitude service conditions
Instrument transformers may be applied at higher altitudes or higher ambient cmpcratures than specified in 4.1 .1, hut the performance may be affected and special consideration should be given to these applications (see 4.4).IEEE C57.13 pdf download.

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