Detail of YD/T 2378-2020

Introduction of YD/T 2378-2020

YD/T 2378-2020 240V direct current power supply system fortelecommunications 1 Scope This standard specifies the composition, product series, technical requirements, test methodstest rules, marking, packaging, transport and storage of 240V direct current power supplysystem for telecommunications This standard is applicable to the DC power supply system with a nominal voltage of 240V folsupplying power to communication equipment in telecommunication stations/sites and data centeiinfrastructure. 2 Normative Documents Quoted The fol lowing referenced documents are indispensable for the application of this documentFor dated references, only the edition cited applies. For undated references, the latestedition of the referenced document (including any amendments) applies.GB/T 191 Packaging-Pictoria! marking for handling of goods GB/T 762-2002 Standard current ratings GB/T 2423.1-2008 Environmental testing-Part 2: est methods - Jests A: Cold GB/T 2423,2-2008 Environmental testing-Part 2: est methods - lests B: Dry heat GB/T 2423.3-2016 Environmental testing Part 2: esting method est Cab: Damp heat, steadystate GB/T 2423, 10-2008 Environmental testing for electric and electronic products - Part 2: ests methods-Test Fo: Vibration (sinusoidal) GB/T 2829-2002 Sampling procedures and tables for periodic inspection by attributes (Applyto inspection of process stability) GB/T 3859.2-2013 Semiconductor converters - General requirements and line commutatedconverters-Part 1-2:Application guide GB/T 3873 General specifications for products packaging of comunication equipmentsGB/T 4208-2017 Degrees of protection provide by enclosure (ip code) GB 4943.1-2011 Information technology equipment -Safety- Part 1: General requirements 3.4 Resistance balance bridge A device for online detection of positive and negative pole-to-ground insulation resistancein a DC loop by measuring the divided voltage through a parallel resistance circuit There are two forms of resistance balance bridges, namely fixed (static) balance bridges anddynamic(switching)balance bridges 3.5 Leakage current The leakage current to the ground caused by the unequal positive and negative currents causedby the decrease of the insulation degree of the positive electrode or the negative electrodeto the ground or the short circuit of the branch in the Dc circuit of the system Its absolute value is equal to the difference between the positive and negative currents.3.6 Recovery time The time required to recover from the difference between the Dc output voltage and the Dc outoutsetting value exceeding the voltake rekulation accuracy ranketo no greater than the voltageregulation accuracy range. 3.7 Clearance The shortest distance between two conductive parts,or between a conductive part and theBOUNDING SURFACE of the equipment, measured through air. (GB 4943.1-2011. 1. 2.10.1) 3.8 Creepage distance The shortest path between two conductive parts, or between a conductive part and the BOUNDlNGSURFACE of the equipment, measured along the surface of the insulation. (G8 4943, 1-2011.1.2. 10. 2) 3.9 Soft start The smooth start-up method of the rectifier module from start-up to its Dc output voltageramping up to the nominal value. 3.10 System delay startThe system controls the rectifier module to start output after delaying for a certain periodthrough the monitoring module. 3.11 System Walk In The system controls the rectifier module to slowly current output through the monitoringmodule. 4 Product composition and classification 4.1 Product composition

Contents of YD/T 2378-2020