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Alcoa Corporation, who conducts operation in more than 10 countries, is the world’s 8th largest producer of aluminum. Since 1888, approximately 75% of its aluminum is still in use today. As the founder of the modern aluminum industry, Alcoa’s innovative technologies have helped the aerospace, automotive, packaging, construction, commercial transportation, consumer electronics and industrial markets achieve multiple development milestones. The time goes back to the early autumn of 2018. Huaming received the inquiry of tap-changers for Alcoa Norway rectifier transformers. The transformer capacity was 26.1MVA, 33kV, and has 96 steps, which has very special requirements for tap-changers. In view of this, Huaming conducted several technical communication with the customer and finally deter...
Release time: 2021 - 06 - 09
In the past 3 decades, around 60% of global power market demand came from industrial, commercial and utilities, which highlights the close connection between economic activities and power consumption. At the beginning of 2021, the foreign epidemic situation gradually stabilized, and the global power market is picking up, ushering in new opportunities for Huaming's overseas market. With years of unremitting efforts, Huaming has been recognized by more and more customers, who trust us and are willing to use our products. Therefore, in the first quarter of this year, the direct export of Huaming tap-changers rose sharply compared with the same period last year, which was a good start for 2021. Throughout the first quarter, Huaming’s direct export orders increased by 119%, turnover in...
Release time: 2021 - 05 - 17
This ZWC de-energized tap-changer is suitable for oil-immersed power transformers and special transformers, such as furnace or rectifier transformer with a rated frequency of 50 or 60 Hz, a maximum equipment voltage of 145kV and maximum rated current of 1000A. Tap changing takes place when the transformer is de-energized, so as to change the transformer ratio and stabilize the output voltage.ZWC tap-changerDrive mechanismZWC is of a split structure and consists of two parts: the body and the drive mechanism. The transformer manufacturer is responsible for connecting these two. It is of linear type and equipped with two insulating support plates as a frame. It is used in power transformers and large-scale distribution transformers. It is installed in the space between the windings and the t...
Release time: 2020 - 04 - 21
Recently, Huaming launched its on-tank reactive vacuum OLTC HWDK. It's a 3-phase on-load tap-changer, composed of one diverter switch and one tap selector, designed for large-current on-load voltage regulation in utilities and industries. The current path during the switching sequence is shown in red.Note: VS: Vacuum interrupter; P1, P4: Tap selector contact; P2, P3: Main contactThe technical data is as belowTypeHWDKMax. rated through-current Ium (A)15002000Rated frequency (Hz)50       60Max. rated voltage tap-to-tap (V)2000Max. rated voltage per step (V)1000Rated step capacity (kVA)30004000Standard operating positions (with change-over selector)3333Regulating winding section9(8 effective)Short-circuit current tes...
Release time: 2020 - 04 - 21
The 110kV substation of a China Unicom cloud data center was recently put into use. As a good partner of on-load voltage regulating power transformer, Huaming’s CZ tap-changer is doing its best to ensure stable performance. CZ dry type vacuum OLTC is made of 3 single-phase tap-changers and is controlled by one motor drive unit. Its max. rated current for one phase is 500A and max. work positions 17 (linear). CZ has pretty good operation records. For example, during 2014 FIFA World Cup at Brazil’s Itaipava Arena Fonte Nova, CZ did an excellent job, guaranteeing reliable power supply. For this China Unicom project, Huaming’s star product 110kV CZ dry type vacuum tap-changer, together with SHM-D smart digital motor drive unit, will for sure contribute to the cloud center’s operation...
Release time: 2020 - 04 - 02
Huaming’s new SDZV vacuum tap-changer was launched to the market, an optimized product based on SHZV, with a better performance in distinguishing arcing and a higher max. rated current of 3000A.* Adopting the same structure of traditional SHZV tap-changer, SDZV inherits SHZV’s advantages, including inputting force from the head, arranging cables outside the oil compartment and transmitting force in the middle.* SDZV vacuum tap-changer is equipped with vacuum interrupters with two sets of contacts arranged in series. Two sets work simultaneously, but the arc-distinguishing compartments are relatively independent, both capable of making and breaking.                * The recovery voltage after vacuum interrupters break the current is reduced to pr...
Release time: 2020 - 04 - 01
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