72.5kv– 550kv Oil-Insulated Transformer Bushing for High Current & Hv Applications

• Customization: Available
• Application: Power, Electronic, Instrument
• Phase: Three
• Model NO.: BLW20
• Core: Core-type Transformer
• Cooling Method: Oil-immersed Type Transformer
• Winding Type: Multi-winding Transformer
• Certification: ISO9001-2000, ISO9001, CCC
• Usage: Single-phase Transformer, Rectifier Transformer, Combined Transformer, Power Transformer, Distribution Transformer
• Frequency Characteristics: Power Frequency
• Shape of Core: EI
• Brand: Cpepe, Tungwell
• Terms: Fob,CIF,EXW
• Price: Negotiable
• MOQ: 1
• Package: Standard
• Delivery: Expediting
• Transport Package: Standard Export Package
• Specification: optional
• Trademark: CPEPE, TUNGWELL
• Origin: China
• Production Capacity: 5000unit/Year
• Package Size: 20.00cm * 20.00cm * 20.00cm
• Package Gross Weight: 50.000kg

Product Description

Important Features

 

1. Insulation Design

   Capacitive grading layers (for ≥245kV) with aluminum foil/semiconductor layers.Oil-side sealing with EPDM or fluorinated rubber for long-term leak resistance.

2. High-Current Performance

   Conductor material: Electrolytic copper (or silver-plated copper), temperature rise limit ≤65K (per IEEE Std C57.19.00).

3. Compatibility

   Direct integration with transformer/reactor oil chambers (no adapters required).

4. Optional Configurations

   Online monitoring (e.g., tap current monitoring via test tap).Pressure relief devices or explosion-proof membranes (for high-capacity bushings).

Technical specification

Category	Parameter	Specification	Standards
Electrical	Rated Voltage	72.5kV, 145kV, 245kV, 362kV, 420kV, 550kV (customizable)	IEEE C57.19.00
	Rated Current	1200A-5000A (higher available)
	Power Frequency Withstand	1.5 × rated voltage for 1 min	IEC 60137
	Lightning Impulse Withstand	As per IEEE Std 386
	Partial Discharge (PD)	≤10 pC at 1.1 × rated voltage
Mechanical	Terminal Mechanical Strength	≥2000N static load	ANSI C57.19.1
	Creepage Distance	≥25 mm/kV (for Pollution Level III)	IEC 60815
Thermal	Operating Temperature Range	-40°C to +105°C	IEEE C57.91
	Short-Term Overload Capability	120°C for 2 hours
Construction	Insulating Medium	Mineral oil (IEC 60296 compliant)
	Conductor Material	Electrolytic copper (silver-plated optional)
	Sealing Material	EPDM or Fluorinated rubber
Testing	Routine Tests	Power frequency, lightning impulse, partial discharge	IEEE C57.19.00
	Special Tests (optional)	Short-circuit withstand, seismic, thermal stability
Optional Features	Monitoring	Tap current monitoring, temperature sensors
	Safety Features	Pressure relief device, explosion-proof membrane

Changzhou Pacific Electric Power Equipment (Group) Co., Ltd is a high-tech enterprise in research, design, manufacture, market and service in High Voltage and Low Voltage power transmission and distribution industry.

Established in 1989 and organized as a comprehensive power solution group company in 1997. The company has a registered capital over USD 20 million and fixed assets over USD 100 million. The company is located in the center manufacturing zone of China, near to Shanghai city, occupies a total area of 240,000 square meters. The annual production capacity is over 20,000 sets of high and low voltage switchgears and 3,000MVA different kinds of transformers. The products are widely used in the area of high-speed railways, subway, city tram, petrochemical, metallurgy, power substation, power plants, high-rise buildings etc. 

With the strong manufacturing backgrounds over the decades, Changzhou Pacific Electric Power Engineering Co., Ltd (hereinafter CPEPE/TUNGWELL) was founded for group oversea' market, as well as supply chain management services. Now, CPEPE/TUNGWELL is a leading distributor of China famous power components, equipment and materials. We serve the construction industries, the commercial, and government market, and utility markets. CPEPE/TUNGWELL products and services support constructions, infrastructures, building renovation, facility maintenance, repair and operations, and original equipment manufacturing. 

Today, CPEPE/TUNGWELL stands as a large supplier of power equipment and engineering, target for one stop solutions for power industries.


Workshops & Production Lines



Subway Industry
Typical Projects: Shenzhen Metro, Changsha Metro, Nanning Metro, Changsha Metro, Foshan Metro, Shijiazhuang Metro, Hefei Metro, Xi'an Metro, Chengdu Metro, Nanjing Metro, Chongqing Metro, Tianjin Metro, Changzhou Metro, Xuzhou Metro, Suzhou Metro, etc.

Petrochemical Industry
Typical Projects: Jiangsu Hengli Chemical Fiber, Jiangsu Jurong Petrochemical, Hengli Petrochemical, Juxian Synthetic Materials, Juhua Group, Qinghai Salt Lake Haina Chemical Industry, Tianjin Bohai Chemical Industry, Tianjin Bohua Chemical Industry, etc.

Power Grid
Thermal power plant
Typical Projects: Harbin Thermal Power, Tianjin Junliangcheng Power Generation, Jiangxi Jingdezhen Power Generation, Guizhou Panxian Power Plant, Tianjin Wuqing Thermal Power, Jiangsu Qinli Thermal Power, Tianjin Dagang Power Plant, etc.
Other power plants (wind power, hydropower, photovoltaics)
Typical Projects: Weng'an 110kV Yinzhan Substation, Naqu High Altitude Test Wind Power Plant in Tibet, Qinxi 220kV Substation, Ningxia Datang International 100MW Wind Farm, China Resources Guangxi Cangwu Liubao Phase I 50MW Wind Power, Qianzhi Changji Mulei Laojunmiao Wind Farm 150MW, Nanchuan Phase II Wind Power, Dongdongtan 50MW Photovoltaic Power Generation, etc.

Metallurgy Industry
Typical Projects: China National Nonferrous Metals Construction Group, Beijing Iron and Steel Group, Baosteel, Nanjing Iron and Steel, Shanghai Meishan Iron and Steel, Jinan Iron and Steel, Northeast Special Steel, Northeast Special Steel , Zhongtian Iron and Steel, Jiuquan Iron and Steel , etc.

Cement Industry
Typical Projects: Anhui Conch, Binhai Renzhou Cement, TCC, Guangan Changxing Cement

Oversea Projects
Projects in oversea markets: Indonesia, Sudan, Zambia, Ethiopia, Myanmar, Russia, Kuwait, Malaysia, Iraq, Cambodia, Mozambique, Vietnam, Japan, Pakistan, Laos, Philippines, Montenegro, South Africa, Cuba, Yemen, Ghana, Senegal, Congo, Mexico, etc. 





 

FAQ

Item	Details
Trade Terms	FOB / CIF / EXW (Negotiable)
Payment Terms	T/T 30% deposit, 70% before shipment (Negotiable)
Currency	USD / EUR / CNY
Delivery Time	10-30 days after deposit
Port of Loading	Shanghai / Ningbo / Tianjin
Packing	Standard Export Wooden Case / Pallet
MOQ	1 Unit (Subject to product type)
Warranty	12-24 Months (Depending on product)
OEM/ODM Service	Available
Certification	ISO / CE / Type Test (per product type)
After-sales Support	Online technical guidance, spare parts available