T/ZDL 022-2023 Active

Main Technical Content: 4.1 Product Categories This document lists the product categories corresponding to power transformers, which are derived from the National Bureau of Statistics' Classification Catalogue for Statistical Use of Products. 39 - Electrical Machinery and Equipment 3904 - Transformers, Rectifiers, and Inductors 390401 - Transformers 39040101 - Power Transformers 390401012 - Power Transformers with a Rated Voltage ≤ 10kV and a Rated Capacity ≤ 2500kVA 4.2 Product Functions and Components Power transformers use the principle of electromagnetic induction to change AC voltages. The main components include the primary coil, secondary coil, and iron core (magnetic core). Their main functions include voltage conversion, current conversion, impedance conversion, isolation, and voltage regulation (magnetic saturation transformers). According to GB/T 6451, the components and requirements of liquid-immersed power transformers should include at least: - Coil (including electromagnetic wire, copper strips, inter-layer insulation, inter-turn insulation, end insulation, insulation oil channels, busbars) - Iron core (including electrical steel strips, upper and lower clamping pieces, clamping piece insulation, feet, foot insulation, pads, tie straps, screws and nuts, etc.) - Leads (including lead cables, copper busbars, tie straps, screws and nuts, wire clamps) - Tank insulation (including insulation plates, spacers, phase separators, insulation panels) - Tank components (including tap-changers, insulating oil, conductive rods, bushings, screws and nuts, nameplates, sheathing, relief valves, oil level gauges) - Assembly components (including tap-changers, insulating oil, conductive rods, bushings, screws and nuts, nameplates, temperature gauges, fans, door controls, alarms, door locks, travel switches, secondary cables) 4.3 Product Technical Characteristics and Applications 4.3.1 Product Description The product description shou