IEEE Std 2747:2020 pdf download.IEEE Guide for Energy Efficiency Technology Evaluation of Electric Power Fittings.
This guide describes the energy efficiency technology evaluation of electric power fittings. It is applicable to electric power fittings that are in direct contact with electric power conductors.
1.2 Purpose
The purpose of this guide is to provide the basis for energy loss test and energy efficiency technology evaluation of electric power fittings. This guide provides technical support for the reduction of power grid loss and the expansion of power grid capacity. It promotes the technical progress of production enterprises for energy efficiency fittings.
1.3 Word usage
The word s/ia/I indicates mandatory requirements strictly to be followed in order to conform to the standard and from which no deviation is permitted (shall equals is required 10).L2
The word should indicates that among several possibilities one is recommended as particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required (should equals is recommended that).
The word may is used to indicate a course of action permissible within the limits of the standard (can equals is permitted to).
The word can is used for statements of possibility and capability, whether material, physical. or causal (can equals is able to).
2. Normative references
The following referenced documents arc 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.
IEC 61284, Overhead lines—Requirements and tests for fittings.
3. Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE Standard.s’ Dictionary Online should be consulted for terms not defined in this clause:
branch connector: Device for connecting a branch conductor to a main conductor.
current-carrying electric fitting: The fitting that is designed for carrying electric current: mainly includes parallel groove clamp, insulation piercing connector, compression-type tension c lamps, compression-type splicing sleeves, etc.
energy loss of fitting: The loss of electric energy caused by a fitting or its assembly with conductors when current passes through.
in-line connector: Device for connecting two conductors to extend the length.
non-current-carrying electric fitting: The fitting that is not designed for carrying electric current; mainly includes suspension clamps, bolt-type tension clamps, wedge-type tension clamps, vibration dampers, spacers, etc.
reference conductor: The conductor with a certain length in the test circuit, which is used as a reference for measuring the energy loss of fittings in order to measure the temperature and energy loss and select the current value for the test.
steady state: The state of which the temperature variation of a reference conductor does not exceed 2 °C within 15 mm, when the test ioop passes through a certain constant current at required test conditions.
4. General requirements
The fitting sample for testing should comply with the requirements in accordance with IEC 61 284.
A fitting under test may be complete with all components. Test equipment should be calibrated or verified as qualified in the validity period.
The following technical details should be recorded in a test report.IEEE Std 2747 pdf download.