The Three-phase transformer from Hefei Qixing Electric Co., Ltd is a dry-type transformer that can be designed for the application. The product page says the input and output voltages, the number and position of the connection modes, the adjustment taps, the winding capacity allocation, the secondary single-phase windings, the rectifier circuits and the cabinet can all be determined during design. The standard connection is Dyn11. The transformer is listed under the Transformer category, and the page gives a table of QX models from QX-100 to QX-60KVA and beyond. The page presents the transformer as a custom-engineered product rather than a fixed catalogue item, which is useful for an OEM panel builder.

Connection and Ratings

The connection winding is Dyn11, and the operating frequency is 50 or 60 Hz. The product capacity range is 10 to 400 kW. The page says the taps are generally plus or minus 5 percent, and that the number and position of the taps can be designed. The user can also specify the input and output voltages and the allocation of winding capacity. A buyer should confirm the primary and secondary voltages, the vector group, the tap range, the impedance and the duty cycle, because those values decide the winding design and the protection settings. The page does not give the impedance voltage, which should be confirmed for the short-circuit protection.

Insulation, Noise and Environment

The dielectric strength is 3000 VAC at 50 Hz, 5 mA for 1 minute without arcing or breakdown between the core and the winding. The insulation resistance is measured at 1000 VDC and is at least 100 megohms. The noise is below 65 dB. The protection grade is IP00, and the application altitude is up to 2000 meters at the current rating. The standards are IEC60076-11:2004, GB1094.11-2007, GB1094-1996 and JBT56009-1998. A buyer should confirm the ambient temperature, the altitude, the enclosure and the cooling method for the actual site. The page also does not give the temperature rise or the insulation class, which should be confirmed for a continuous load.

Models and Dimensions

The page lists the QX models from QX-100 through QX-60KVA, with three dimensions for each model. The small models, such as QX-100 and QX-200, are 120 by 88 by 120 mm, while the larger models, such as QX-50KVA and QX-60KVA, are 600 mm wide and 290 to 510 mm in the other dimensions. The capacity unit in the model name is not consistent for every row, so the buyer should confirm the kVA or kW rating for the selected model. The dimensions are useful for the cabinet layout, but the weight and the terminal position should also be requested. The page does not give the weight or the terminal layout for each model, which should be requested for the panel design.

Company and Ordering

Hefei Qixing Electric Co., Ltd lists an email of hefeiqixing@aliyun.com and a telephone number of +86 15605561586. The product structure includes transformers, ozone generators, inductor coils, reactors, filters and wire harnesses, with application pages for reactors, transformers and wiring harnesses and an ODM and OEM page. The page does not give a price, a minimum order quantity, a delivery time or a warranty term, so those points should be confirmed in the quotation. It is also worth asking for the routine test report, the type test report and the drawing for the selected model. The page also lists a qualification honor page, which is useful for a supplier review. A routine test should include the winding resistance, the ratio, the insulation and the no-load loss.

If you need a Three-phase transformer for a machine, a power supply or an industrial panel, send us the primary and secondary voltages, the capacity, the vector group, the tap range, the frequency, the ambient conditions, the enclosure and the quantity. We will confirm the QX model, the winding design and the test plan, and we will point out the values that should be checked against the load and the installation. A clear electrical and site brief at the start is the best way to avoid a transformer that has the right capacity but the wrong vector group or tap range for the system.