IEEE Std 2747-2020 pdf download – IEEE Guide for Energy Efficiency Technology Evaluation of Electric Power Fittings.
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. IEC 61284, Overhead lines—Requirements and tests for fttings. 3 3. Defnitions For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary Online should be consulted for terms not defined in this clause. 4 branch connector: Device for connecting a branch conductor to a main conductor. current-carrying electric ftting: The ftting that is designed for carrying electric current; mainly includes parallel groove clamp, insulation piercing connector, compression-type tension clamps, compression-type splicing sleeves, etc. energy loss of ftting: The loss of electric energy caused by a ftting 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 ftting: The ftting that is not designed for carrying electric current; mainly includes suspension clamps, bolt-type tension clamps, wedge-type tension clamps, vibration dampers, spacers, etc.
6.6 Test procedures 6.6.1 Test steps a) The layout of the test circuit should be set up according to 6.4. b) A test current should then be passed through the test circuit. Consult Annex B for the value of the test current. Another method is to select a certain test temperature in advance. The value and duration of the test current should be such as to raise the reference conductor temperature to the test temperature. When the conductor temperature reaches a steady state, keep constant for 30 min. Use an initial current value not greater than 1.5 times of the test current to provide accelerated heating to reduce testing time. c) Measure and record data every fve min in the last 10 min of steady state, and obtain the results by means of average values of three times measurement. When the energy loss of the fttings is too small to be measured directly, the total energy loss of the fttings and one of its connecting conductors can be measured frst before the energy loss of the connecting conductors can be measured. Subtract them to obtain energy loss P t between the voltage measuring points at the two ends of the ftting.