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MIL-PRF-27/366 - TRANSFORMER, SWITCHING
July 4, 2018 - NPFC
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IEEE C57.109 - Guide for Liquid-Immersed Transformer Through-Fault-Current Duration
September 27, 2018 - IEEE

This guide applies to transformers referenced in IEEE Std C57.12.00 as Categories I, II, III, and IV.1 It sets forth recommendations essential for the application of overcurrent protective devices applied to limit the exposure time of transformers to short-circuit currents (see IEEE...

ASTM A1009 - Standard Specification for Soft Magnetic MnZn Ferrite Core Materials for Transformer and Inductor Applications
October 1, 2018 - ASTM

This specification covers the requirements to which the specified grades of soft magnetic manganese zinc (MnZn) ferrite materials shall conform. Cores made from these materials are used primarily in transformers and inductors. Frequency-MnZn ferrite cores are primarily used for frequencies...

IEC TS 63042-301 - UHV AC transmission systems – Part 301: On-site acceptance tests
December 1, 2018 - IEC

This part of IEC 63042, which is a technical specification, applies to on-site acceptance tests of electrical equipment with the highest voltages of AC transmission system exceeding 800 kV. The electrical equipment exceeding 800 kV includes the following items: power transformers; circuit...

DS/EN IEC 60076-11 - Power transformers – Part 11: Dry-type transformers
October 29, 2018 - DS

NEW!IEC 60076-11:2018 is available as IEC 60076-11:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition...

DS/EN 50064 - High-voltage switchgear and controlgear – Gas-filled wrought aluminium and aluminium alloy enclosures
November 12, 2018 - DS

This document applies to wrought aluminium and aluminium alloy enclosures and their welding. These enclosures are pressurized with dry air, inert gases, for example sulphur hexafluoride or nitrogen or a mixture of such gases, used in indoor and outdoor installations of high-voltage switchgear and...

IEEE PC57.105 DRAFT - Draft Guide for Application of Transformer Connections in Three-Phase Electrical Systems
August 1, 2018 - IEEE

This guide describes transformer connections and configurations in three-phase electrical systems, the characteristics of these various connections, and the possible operating problems under normal or abnormal conditions. All combinations of Delta and Wye, grounded and ungrounded, T...

DS/EN 50069 - High-voltage switchgear and controlgear – Gas-filled welded composite enclosures of cast and wrought aluminium alloys
November 6, 2018 - DS

This document applies to welded composite enclosures of cast and wrought aluminium alloy pressurized with dry air, inert gases (e.g. sulphur hexafluoride or nitrogen or a mixture of such gases), used in indoor and outdoor installations of high-voltage switchgear and controlgear with rated voltages...

IEEE PC57.12.32 DRAFT - Draft Standard for Submersible Equipment - Enclosure Integrity
November 1, 2018 - IEEE

This standard covers conformance tests and requirements for the integrity of submersible electrical equipment intended for installation in submerged or partially submerged environments. These enclosures contain energized electrical apparatus, typically not accessible to the general public,...

SNZ AS/NZS 61558.1 - Safety of transformers, reactors, power supply units and combinations thereof – Part 1: General requirements and tests
November 30, 2018 - SNZ

Foreword This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee EL-002 - Safety of Household and Similar Electrical Appliances and Small Power Transformers to supersede AS/NZS 61558.1:2008 and its amendments. During this period AS/NZS 61558.1:2008 will...

DS/EN IEC 60358-4 - Coupling capacitors and capacitor dividers – Part 4: DC and AC single-phase capacitor dividers
November 26, 2018 - DS

IEC 60358-4:2018 applies to DC or AC single-phase capacitor-dividers connected between line and ground used for manufacturing Voltage Transformers as well as for other applications. IEC 60358-4:2018 is to be used in conjunction with the latest edition of IEC 60358-1 and its amendments. IEC...

IEEE P1276 DRAFT - Draft Guide for the Application of High-Temperature Insulation Materials in Liquid-Immersed Distribution, Power and Regulating Transformers
October 1, 2018 - IEEE

This guide applies to liquid-immersed distribution, power and regulating transformers that are designed to operate at temperatures that exceed the normal thermal limits of IEEE Std C57.12.00 under continuous load, in the designed average ambient, and at rated conditions. Purpose The purpose...

IEEE PC57.13.7 DRAFT - Draft Standard for Current Transformers with Maximum mA Secondary Current of 250mA
September 1, 2018 - IEEE

This standard is intended to define the requirements for current transformers with a maximum of secondary output of 250 milliamperes. These requirements of ratios, Accuracy classes, burdens and test methods supplement but are not subordinate to IEEE C57.13™ Standard Requirements for...

IEEE C57.110 - Recommended Practice for Establishing Liquid Immersed and Dry-Type Power and Distribution Transformer Capability when Supplying Nonsinusoidal Load Currents
June 14, 2018 - IEEE

This recommended practice applies only to two winding transformers covered by IEEE Std C57.12.00, IEEE Std C57.12.01, and NEMA ST20.1 It does not apply to rectifier transformers.2 Purpose The purpose of this document is to establish uniform methods for determining the capability of...

IEC/IEEE 60076-16 - Power transformers – Part 16: Transformers for wind turbine applications
September 1, 2018 - IEC

This part of IEC 60076 applies to dry-type and liquid-immersed transformers for wind turbine step-up applications having a winding with highest voltage for equipment up to and including 72,5 kV. This document applies to the transformer used to connect the wind turbine generator to the...

IEC 60076-16 REDLINE - Power transformers – Part 16: Transformers for wind turbine applications
September 1, 2018 - IEC

This part of IEC 60076 applies to dry-type and liquid-immersed transformers for wind turbine step-up applications having a winding with highest voltage for equipment up to and including 72,5 kV This document applies to the transformer used to connect the wind turbine generator to the...

IEC 60076-11 REDLINE - Power transformers - Part 11: Dry-type transformers
August 1, 2018 - IEC

This part of IEC 60076 applies to dry-type power transformers (including auto-transformers) having values of highest voltage for equipment up to and including 72,5 kV and at least one winding operating at greater than 1,1 kV. This document does not apply to: • gas-filled dry-type...

IEC 60076-11 - Power transformers – Part 11: Dry-type transformers
August 1, 2018 - IEC

This part of IEC 60076 applies to dry-type power transformers (including auto-transformers) having values of highest voltage for equipment up to and including 72,5 kV and at least one winding operating at greater than 1,1 kV. This document does not apply to: • gas-filled dry-type...

IEEE P3004.11 DRAFT - Draft Recommended Practice for Bus and Switchgear Protection in Industrial and Commercial Power Systems
October 1, 2018 - IEEE

This recommended practice covers the protection of bus and switchgear used in industrial and commercial power systems. It provides fault protection and isolation strategies for the substation bus and switchgear, including the bus, circuit breakers, fuses, disconnecting devices, transformers,...

DS/EN IEC 60268-4 - Sound system equipment – Part 4: Microphones
November 12, 2018 - DS

This part of IEC 60268 specifies methods of measurement for the electrical impedance, sensitivity, directional response pattern, dynamic range and external influences of sound system microphones, and also details the characteristics to be specified by the manufacturer. It applies to sound system...

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