IEEE C57.13-2008 pdf free download.IEEE Standard Requirements for Instrument Transformers.
IMPORTANT NOTICE: This standard is not intended to assure safety, security, health, or environmental protection in all circumstances. Implementers of the standard are responsible for determining appropriate safety, security, environmental, and health practices or regulatory requirements. This IEEE document is made available for use subject to important notices and legal disclaimers. These notices and disclaimers appear in all publications containing this document and may be found under the heading “Important Notice” or “Important Notices and Disclaimers Concerning IEEE Documents.” They can also be obtained on request from IEEE or viewed at http://standards.ieee.org/IPR/disclaimers.html. 1. Overview 1.1 Scope This standard is intended for use as a basis for performance 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 transformers 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 transformers. 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. ANSI C37.06, American National Standard for Switchgear⎯AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis⎯Preferred Ratings and Related Required Capabilities. 1 IEEE Std 4 TM , IEEE Standard Techniques for High-Voltage Testing. IEEE Std C37.04 TM , IEEE Standard Rating Structure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Current Basis. 2, 3 IEEE Std C37.09 TM , IEEE Standard Test Procedure for AC High-Voltage Circuit Breakers Rated on a Symmetrical Basis. IEEE Std C57.12.00 TM , IEEE Standard General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers. IEEE Std C57.12.90 TM , IEEE Standard Test Code for Liquid-Immersed Distribution, Power, and Regulating Transformers. IEEE Std C57.19.00 TM , IEEE Standard General Requirements and Test Procedure for Outdoor Apparatus Bushings. IEEE Std C57.13.6 TM , IEEE Standard for High-Accuracy Instrument Transformers. NEMA SG 4, Alternating-Current High-Voltage Circuit Breakers. 4 3. Definitions For the purposes of this document, the following terms and definitions apply. The Authoritative Dictionary of IEEE Standards Terms [B30] 5 should be referenced for terms not defined in this clause. 3.1 indoor voltage 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 primary winding as an integral part of the structure.
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 exceed 1000 m. 18.104.22.168 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 of the cooling air for any 24-h period does not exceed 30 °C. 6 The minimum ambient air temperature is –30 °C. 22.214.171.124 55 °C average ambient temperature Instrument transformers may also be given ratings for operation in 55 °C average ambient temperature, with 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 temperatures than specified in 4.1.1, but the performance may be affected and special consideration should be given to these applications (see 4.4).