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Pearl Electric Co., Ltd.

Transformer, Power Transformer, Oil-Immersed Power Transformer manufacturer / supplier in China, offering Power Transformer up to 110kv and 220mva (50~220MVA, 11~110kV), 35kv Voltage-Class Cast-Resin Dry-Type Transformer (IP), Amorphous Alloy Dry-Type Transformer and so on.

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Supplier Homepage Product 03_Oil-immersed Power Transformer Power Transformer up to 110kv and 220mva (50~220MVA, 11~110kV)

Power Transformer up to 110kv and 220mva (50~220MVA, 11~110kV)

FOB Price: US $10,000 / Piece
Min. Order: 1 Piece
Min. Order FOB Price
1 Piece US $10,000/ Piece
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Production Capacity: 100
Transport Package: Wooden Case/Pallet
Payment Terms: L/C, T/T, D/P, Paypal, Money Gram, Western Union, cash

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Basic Info
  • Model NO.: 50~220MVA, 11~110kV
  • Phase: Three
  • Cooling Method: Customized
  • Certification: ISO9001-2000, ISO9001, CCC, Kema CE
  • Capacity: up to 200mva
  • Reference Standard: IEC 60076
  • Specification: IEC
  • HS Code: 850423
  • Application: Power, Electronic, Instrument, Lighting, Rectifier
  • Core: Core-type Transformer
  • Winding Type: Separated Winding Transformer
  • Manufacturer: Pearl Electric Co., Ltd.
  • Voltage Class: up to 220kv
  • Trademark: Pearl
  • Origin: China
Product Description
1, Dry-type Transformer:
1. Low loss,low noise,low partial discharge and high reliability   
2. Excellent dynamic thermal stability and high anti-lightning impulse capability.
3. Epoxy resin pressure casting technology is adopted for HV coils,resulting in much excellent performance.
4. Simulation analysis is carried out for core mould designing,to avoid cavity resonance and reduce noise level greatly. Lightning impulse wave simulation calculation and analysis are carried for the HV coils,thus to improve transformer's anti-lightning impulse capability.

Power Transformer up to 110kv and 220mva (50~220MVA, 11~110kV)

2, Oil-immersed Transformer
1. Low loss, low noise and high reliability.
2. Excellent dynamic thermal stability and high over-load capacity.
3. Simulation analysis was carried out for the core mould design, thus to greatly reduce noise level. Simulated lightning impulse wave process was carried out for HV winding mould design, thus to greatly improve product's anti-lightning impulse capability.


Power Transformer up to 110kv and 220mva (50~220MVA, 11~110kV)


3, Pad-mounted Transformer

 Pad-mounted transformer is the complete set of power transformation and distribution equipment that has the active part, HV load switchgear, protective fuse and HV&LV connections installed in a common hermetically sealed tank.

Power Transformer up to 110kv and 220mva (50~220MVA, 11~110kV)


4, 110kV Power Transformer

 The 110kV series low-loss transformer manufactured by Pearl with "Pearl" brand is the latest product designed and developed on the basis of absorbing the most advanced technology at home and abroad. It features high reliability, low partial discharge, low noise, low loss and high anti-short circuit capability. Its excellent and reliable performance have won customers' as well as experts' reorganizations and appreciations.

 
5, Amorphous Alloy Dry-type Transformer

Amorphous alloy is a new type of material with high magnetic conductivity and energy-saving performance. With the rapid quenching solidification production process, the metal atoms are disordered and arranged in non-crystal way. It is different from the crystal structure of tradition silicon steel and is much easier to be magnetized and demagnetized. Typical amorphous alloy steel sheet contains 80% iron, while the other ingredients are boron and silicon. The thickness of amorphous alloy steel sheet is very small, only 20 to 30um, less than 1/10 thickness of traditional silicon steel sheet.

6, Amorphous Alloy Oil-immersed Power Transformer

  Amorphous alloy is a new type of material with high magnetic conductivity and energy-saving performance. With the rapid quenching solidification production process, the metal atoms are disordered and arranged in non-crystal way. It is different from the crystal structure of tradition silicon steel and is much easier to be magnetized and demagnetized. Typical amorphous alloy steel sheet contains 80% iron, while the other ingredients are boron and silicon. The thickness of amorphous alloy steel sheet is very small, only 20 to 30um, less than 1/10 thickness of traditional silicon steel sheet. The characteristics of amorphous alloy core are as follows: high saturation magnetic induction intensity, low-loss (20% ~ 30% of traditional silicon steel sheet), low coercive force, low excitation current and high thermal-stability.
  7, Pad-mounted Transformer for Wind Farm

With the global requirements for energy becoming more and more pressing, traditional energy resources such as coal, petroleum and natural gas being consumed at higher and higher rate, human paying more and more attentions to environment protection and technology changing quickly along with each passing day, the newly emerging wind power electricity, as a type of reproducible resource, gains rapid development and becomes a new main force among the newly built power plant.

Generals
The oil-immersed power transformer manufactured by Pearl Electric with "Pearl" brand is the main product designed and developed on the basis of absorbing the most advanced technology at home and abroad. It features high reliability, low partial discharge, low noise, low loss and high anti-short circuit capability. Its excellent and reliable performance have won customers' as well as experts' reorganizations and appreciations.
 
Specifications:
 Rated H.V.:22, 33, 66, 88, 121, 145, 220kV or customize
Vector GroupYNd11, Dyn11 or customized
 Rated L.V.:6.3 (6.6, 10.5, 11)kV or custoized
 Capacity:up to 200MVA
No-load Loss:Customized for each type
Load LossCustomized for each type
No-load Current:Customized for each type
Impedance Voltage:10.5% or Customized for each type
Tap-changingOn-load Tap-changing or off-load tap-changing
Cooling Method:ONAN/ONAF
 Reference Standards IEC60076
Notes: The above specifications may be customized according to customer's requirement.
 
Features & Advantages
1. Low partial discharge: the apparent discharge quantity is usually less than 100pC; 
2. Low noise: Product of 63MVA or below 63MVA has a noise level less than 60dB;
3. Low loss: no-load loss is reduced by 20 percent compared with that specified in national standards;
4. High anti-short capability: the SFZ10-40000/110 transformer has passed the short-circuit test carried out by China National Transformer Quality Supervision Testing Center.
 
Electromagnetism calculation:
The insulation strength is comprehensively calculated with reference to the formula of "impulse voltage gradient+ actuation duration". Parsing imaging method is used for precisely calculating winding magnetic field and ampere-turn balance between windings, thus to minimize the mechanical strength. 
Electric field wave process and field intensity are calculated, thus to ensure both the principal and longitudinal insulation having sufficient strength under impulse voltage. Advanced auxiliary computer programs are used to simulate and calculate the temperature rise on core and windings, with precision reaching each core step and each winding disk.
 
Winding:
The interleaved and continuous winding structure is adopted for HV windings, thus to improve the electric distribution and effectively improve the anti-lightning impulse capability. Inner and outer support strip structure is adopted. The support strips and pads are all rounded to improve insulation reliability. Oil-directing structure is adopted in the winding, thus to reduce the hotspot temperature and prolong insulation life.
Both the H.V and M.V. windings are usually provided with separate voltage regulating windings, so the ampere-turn of all the windings are completely balanced. These can effectively eliminate the axial electrodynamics force during external short circuit and improve the dynamic stability under external short circuit.
 
Tank:
Bell-type tank is adopted for the transformer (for transformer of below-20MVA, barrel-type tank is used). The tank wall is made into a corrugated shape with special machining equipment. This will reduce the welding work and the mechanical strength will be much improved. The tank rims are sealed with oil-resistant rubber pad and there is a position-limit device on bottom part of the tank.
 
Core:
High-quality cold-rolled grain-oriented silicon steel sheets are used for core manufacturing. 45-degree mitring and steps-overlapping structure is adopted. No punching holes in the core. The silicon steel sheet is cut with the most advanced cutting machine, with the cut edging burrs less than 0.02mm. This greatly reduces transformer's no-load loss.
 
Cooling Devices and Other Accessories:
The main cooling methods for transformers are ONAN (natural air cooling) and ONAF (air forced cooling). Transformers are designed to operate at full load when fans are in operation, and at 70% of the full load when fans are shut down. Panel-type radiators are used. A more compact size can be obtained for transformers equipped with such radiators .The fans generally blow horizontally, with lower speed and lower noise. The on/off operations of the fans are controlled according to changes in oil temperature and load.
Conservator with rubber bladder is used for the transformer, within which are the oil-resistant and sealed bladder for isolating the oil from the atmosphere. To further improve the reliability, the air cell in the bladder are connected with exterior atmosphere through silica gel breather.

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