Step-up substation is designed as box type and specially for new
energy generation industry, which can adjust the low voltage from
inverter station to high voltage and then run in power grid. So a
box-type inverter station and a step-up station can be integrated
into one power generation station. It’s widely applied in Solar
Energy Power Plant, Wind Energy Power Plant and Nuclear Power
1. One of the drafters of the National Standard Mine Flameproof Mobile Substations (GB/T 8286-xxxx ), which will replace the existing national standard (GB/T 8286-2005 )
and it was submitted for trial in Beijing.
2. +20 years experience R&D team, derived from a 60 years of history transformer manufacturer in Changsha,
Hunan, China since 1956.
3. Full range of transformer types with customized functions are available.
4. CE & ISO certificated.
Below are the tests conducted by Varelen before delivery. Other
tests required by clients can also be done accordingly.
Resistance of all windings
Check voltage ratio and vector group
No-load test at rated frequency and rated voltage
Withstand voltage test
Induced over-voltage withstand test
Partial discharge measurement
1. Intelligient control, integrated with enclosure, compact
structure and high environmental adaptability for outdoor
2. The three-limb iron core is made of oblique cut Grain-oriented,
seven-step silicon steel laminations insulated on both sides,
guaranteeing low losses and low noise. These values are even
improved by laser treatment. It is protected on the surface with a
flash-proof varnish in order to prevent the sheet from corrosion
and to reduce the noise.
3. Clamping frame: it is processed by CNC cutting, bending and then
one-time punch forming, the hole’s size is accurate and the
appearance looks delicate.
4. The winding coil is made of oxygen-free copper, class H for main
insulation materials and coil is insulated by NOMEX paper of DUPONT
brand, LV winding is isolated by copper foils. All these make the
heat-resistant is up to 220℃, with excellent overload capacity and
low loss, but high efficiency.
5. Varelen practices strictly exclusive casting system of F(155℃)
or H(180℃), and the epoxy resin is injected and casted in the
vacuum machine, so it’s highly insulated, dust-proof and
moisture-proof, which ensures stable and reliable performance
|Dry-type transformer type||Cast resin|
|Rated capacity||up to 25MVA|
|Rated input voltage||Up to 36KV|
|Rated output power||315 ~2400kW|
|Phases||Single or three phase|
|Tapping||With tapping links or on-load tap changer|
|Frequency||50Hz or 60Hz|
|Vector groups||Dy, Yy, Yd as standard. Other on request|
|class insulation||According to IEC 60085, Class F or Class H|
|Temperature rise||With ambient temperature in accordance with IEC 60076-11|
|Type of cooling||AN/AF|
|IP rate||IP00 to IP54|
Qingdao Hengfengyou Electrical Engineering Co. , Ltd. is one of the
large-scale electric complete
sets of manufacturers in China, specializing in oil-immersed
transformers, dry-type transformers,
high-voltage Cabinets, low-voltage cabinets and substation
manufacturing specialized electrical
enterprises. The company is located in the beautiful coastal city
of china-qingdao. The company
has a registered capital of 10 million yuan, 20 senior technical
personnel, more than 500 employees,
and a sound sales and service system, annual output value of US $1
billion, the products sell well
at home and abroad.