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ABB - Technical guide - The MV/LV transformer substations The subject of this Technical Guide is MV/LV substations; in accordance with the reference standard, the discussion will be limited to substations with installed power limited to 2000 kVA or two 1000 kVA MV/LV transformers. The purpose of this guide is to give an overview of the guidelines and requirements specified by current regulations for the design and construction of substations in order to guide the designer and the user to the correct system choices. The document will only touch on a few topics such as the thee sizing of the earthing system and the building aspects, for further details on which you are referred to the specific regulations. Lastly, the document does not deal with issues related to active Users, in other words those that produce alternating current electricity with parallel operation (even temporary) with the network. Download Technical guide - The MV/LV transformer substations  A non-exhaustive list is provided below of the main Reference Standards used in the drawing up of this Technical Guide. – CEI TS 62271-210: High-voltage switchgear and controlgear - Part 210: Seismic qualification for metal enclosed and solid-insulation enclosed switchgear and controlgear assemblies for rated voltages above 1 kV and up to and including 52 kV – CEI 99-4: Customer/End user guide to creating MV/LV electrical substations – CEI EN 61936-1: CEI classification: 99-2, Power installations exceeding 1 kV a.c. – Part 1: Common rules – CEI EN 50522: CEI classification:99-3, Earthing of electrical installations with voltage greater than 1 kV AC – CEI EN 62271-1: High voltage switchgear and controlgear, Part 1: Common specifications – CEI EN 62271-200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV – CEI EN 62271-202: High-voltage/low-voltage prefabricated substation – CEI EN 50532: Compact switchgear assembly for distribution stations – CEI 11 – 17 and variant V1: Systems for generation, transmission and public distribution of electrical energy. Cable line; – CEI 64-8: User electrical installations with rated voltage not greater than 1000 V AC and 1500 V DC; – Guide CEI 11 - 37: Guide for the implementation of earthing systems in user energy systems powered at a voltage greater than 1 kV. – CEI 64-12, Guide for the implementation of the earthing system in buildings for residential use and in the service sector – CEI EN 50272-2: Safety requirements for accumulator batteries and their installations, Part 2: Stationary batteries – DK 5600 ed.IV -March 2004: Criteria for the connection of customers to the MV distribution network Please note that the Law no.186 of 1 March 1968 and Ministerial Decree no.37 of 22 January 2008, updated by the Decree of 19 July 2010, assigned a legal role to CEI standards. Indeed, Article 2 of the Law and Article 6 of the Decree state that the installations must be constructed in a workmanlike manner, and that this goal can be achieve through compliance with CEI standards. |