The transformer is one of the main equipments in the power transmission and transformation system. Although its efficiency is very high, its loss can take up the line because of its large total capacity and the number of stages changed in the transmission and distribution system. The total consumption is 17%. The small and medium-sized distribution transformers have a small capacity but a large number. China requires the promotion of low-consumption transformers in the short term, so the transformation of high-consumption transformers has become an effective way to save energy and tap potential and improve economic efficiency. In general, there are four methods for energy-saving transformation of transformers: derating, maintaining capacity, increasing capacity, and adjusting capacity.
(1) Winding reforming method: changing the high and low voltage winding derating method, changing the high and low voltage windings to adjust the volume method, changing the high and low voltage windings, adjusting the volume method, changing the high and low voltage windings to maintain the capacity method, and changing the high and low voltage windings. Quality method, high-voltage, low-voltage winding capacity increase method.
(2) Iron core reforming method: change all iron core method, change part of iron core method, change part of core method, change all yoke method, change part of yoke method, increase or decrease core column series method, increase or decrease core diameter method, Single-piece overlapping iron core method, iron core silicon steel sheet overlap method, iron core silicon steel sheet re-insulation method.
(3) Winding and iron core modification method: full-change winding, iron core capacity-increasing method, full-change winding, iron core retention method, full-change winding, iron core derating method.
After the energy-saving transformation of the transformer, technical indicators and requirements should comply with the relevant national requirements:
(1) The no-load loss of the transformer is reduced by 45% to 55% before the modification, which is better than the JBl300-73 standard I (cold-rolled silicon steel sheet) data, reaching the S7 or SL7 low-loss transformer data;
(2) The no-load current is reduced by about 70% before the modification;
(3) The no-load short-circuit loss complies with the national standard or relevant regulations;
(4) The impedance drop is controlled at 3.6% to 5.5% (3 to 1 k kV, 30 to 1 600 kVA), 6% to 7.7% (35 kV, 50 to 1 600 kVA).
(1) Winding reforming method: changing the high and low voltage winding derating method, changing the high and low voltage windings to adjust the volume method, changing the high and low voltage windings, adjusting the volume method, changing the high and low voltage windings to maintain the capacity method, and changing the high and low voltage windings. Quality method, high-voltage, low-voltage winding capacity increase method.
(2) Iron core reforming method: change all iron core method, change part of iron core method, change part of core method, change all yoke method, change part of yoke method, increase or decrease core column series method, increase or decrease core diameter method, Single-piece overlapping iron core method, iron core silicon steel sheet overlap method, iron core silicon steel sheet re-insulation method.
(3) Winding and iron core modification method: full-change winding, iron core capacity-increasing method, full-change winding, iron core retention method, full-change winding, iron core derating method.
After the energy-saving transformation of the transformer, technical indicators and requirements should comply with the relevant national requirements:
(1) The no-load loss of the transformer is reduced by 45% to 55% before the modification, which is better than the JBl300-73 standard I (cold-rolled silicon steel sheet) data, reaching the S7 or SL7 low-loss transformer data;
(2) The no-load current is reduced by about 70% before the modification;
(3) The no-load short-circuit loss complies with the national standard or relevant regulations;
(4) The impedance drop is controlled at 3.6% to 5.5% (3 to 1 k kV, 30 to 1 600 kVA), 6% to 7.7% (35 kV, 50 to 1 600 kVA).
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