WESTINGHOUSE Transformer Product Line

WESTINGHOUSE Transformer Product Line

Brand positioning and core values

Westinghouse, as a globally renowned brand with a 130 year history of innovation, has always adhered to the core concept of "technological innovation, excellent quality, comprehensive service, and competitive price" since its establishment in 1886. It has left many milestone achievements in the field of electricity - from supplying AC power to the United States for the first time, to participating in capturing the moment of human landing on the moon, the brand has a deep accumulation. Nowadays, its transformer product line serves as a core pillar in the industrial and energy fields, with the core advantages of full voltage coverage, multi scenario adaptation, high reliability, and low loss energy saving, providing stable and efficient power conversion solutions for global power systems, industrial production, and household electricity use scenarios. The products comply with IEC international standards and Chinese GB standards, and have both standardized mass production and customized service capabilities. It is a trusted transformer supplier in the global industrial and civilian fields.

Quality assurance system and certification qualifications

（1） Quality Standards and Management System

The entire process of product design, production, and testing strictly follows IEC international standards and Chinese GB standards, while supporting customized development according to users' special needs to meet personalized technical requirements in different scenarios.

Establish a comprehensive quality assurance system, strictly implement ISO9001 (Quality Management), ISO14001 (Environmental Management), OHSAS18001 (Occupational Health and Safety Management) system specifications, and ensure that the entire process from raw material procurement, production processes to finished product testing is controllable.

（2） Authoritative certification qualifications

Obtained KEMA certification from the Netherlands: covering power transformers and distribution transformer products with multiple voltage levels and capacities such as 180MVA/220kV, 50MVA/110kV, 16MVA/35kV, etc. The certification scope covers core mainstream models.

Obtained China CTQC certification (National Transformer Quality Supervision and Inspection Center): including 150MVA/220kV, 50MVA/110kV and other power transformers, which meet China's market access and quality standards and are suitable for domestic power system needs.

Production process and equipment: Advanced production testing equipment, complete processing procedures, and scientific process plans are adopted. Core components (such as iron cores and coils) are optimized and verified in all dimensions to ensure consistent and stable product performance.

Transformer product system and core technical parameters

The Westinghouse transformer product line covers 16 major categories, with voltage levels ranging from 2.5kV-220kV and rated capacity ranges from 30kVA to 420000kVA. It is suitable for a wide range of applications from high-voltage transmission to low-voltage distribution, from general scenarios to special industrial needs. The core information of each series is as follows:

（1） Power Transformer Series (High Voltage Transmission Core Equipment)

1. 220kV power transformer

Core types: three-phase double winding/three winding non excited voltage regulating transformer, three-phase double winding/three winding on load voltage regulating transformer, three-phase three winding non excited voltage regulating autotransformer, etc.

Rated capacity: 31500kVA-420000kVA, covering the transmission needs of medium and large substations and power plants.

Key parameters:

Voltage ratio: Suitable for multiple specifications such as 220kV ± 2 × 2.5%, 230kV ± 2 × 2.5%, 242kV ± 2 × 2.5% on the HV side, and 6.3kV, 6.6kV, 10.5kV, 13.8kV, 15.75kV on the LV side.

Connection groups: YNd11, YNyn0d11, YNa0d11, etc., to meet different grid connection requirements.

Loss indicators: no-load loss of 32kW-173kW, load loss of 128kW-824kW, no-load current of 0.28% -0.56%, excellent energy-saving performance.

Short circuit impedance: 6% -34% (varies depending on the model), strong short-circuit resistance, and high operational stability.

Application scenarios: Large power plants, 220kV substations, regional power grid backbone lines, responsible for the core tasks of long-distance transmission of high-voltage electrical energy and voltage level conversion.

2. 110/66kV power transformer

Core types: Three phase dual winding/three winding non excited voltage regulating (NLTC) transformers, three-phase dual winding/three winding on load voltage regulating (OLTC) transformers, mainly oil immersed structures.

Technical features: Through multi-dimensional innovation in materials, processes, and structures, it has advantages such as small size, light weight, high efficiency, low loss, low noise, and reliable operation, which can significantly reduce power grid losses and operation costs.

Rated capacity: 6300kVA to 180000kVA, suitable for medium-sized transmission and distribution hubs.

Key parameters:

Voltage ratio: 110kV ± 2 × 2.5%, 121kV ± 2 × 2.5% (110kV level); 63kV, 66kV, 69kV ± 2 × 2.5% (66kV level), LV side 6.3kV, 10.5kV, 13.8kV, etc.

Loss indicators: no-load loss of 7.4kW-90kW, load loss of 35kW-457kW, no-load current of 0.20% -0.66%.

Short circuit impedance: 6.5% -19%, suitable for the operating characteristics of medium voltage power grids.

Application scenarios: Small and medium-sized power plants, 110/66kV substations, and self owned power stations of large industrial enterprises (such as heavy machinery factories and chemical industrial parks).

3. 35kV power transformer

Core types: Three phase dual winding non excited voltage regulating transformer, three-phase dual winding on load voltage regulating transformer, covering two types of applications: power transformers and distribution transformers.

Technical features: Adopting Westinghouse's exclusive calculation and verification process, the core components such as iron core, coil, body, and outlet oil tank are optimized in all dimensions, with advantages of low loss, low partial discharge, low noise, compact size, energy-saving and environmental protection, and low operation and maintenance costs.

Rated capacity: 630kVA-31500kVA, covering medium voltage distribution and industrial power supply needs.

Key parameters:

Voltage ratio: 35kV ± 2 × 2.5%, 35kV ± 3 × 2.5%, LV side 3.15kV, 6.3kV, 10.5kV, etc.

Loss indicators: no-load loss of 0.83kW-21.8kW, load loss of 7.86kW-116kW, no-load current of 0.25% -0.65%.

Short circuit impedance: 6.5% -10.0%, with Yd11 and YNd11 as the main connection groups.

Application scenarios: 35kV substations, industrial park distribution networks, and power supply hubs for large building clusters (such as new city development zones).

（2） Distribution Transformer Series (Low Voltage Distribution Terminal Equipment)

1. 20kV distribution transformer

Core type: Three phase dual winding non excited voltage regulating distribution transformer, oil immersed structure.

Technical features: No oil storage tank respirator design, avoiding contact between transformer oil and air, enhancing antioxidant capacity; The corrugated oil tank can expand and contract with changes in oil temperature, maintaining stable pressure inside the tank and enhancing reliability and corrosion resistance; The sealing element is made of high-quality acrylic rubber, which effectively resists light aging and thermal aging.

Rated capacity: 30kVA-1600kVA, suitable for urban distribution networks and low-voltage power supply in industrial parks.

Key parameters:

Voltage ratio: 20kV ± 2 × 2.5%, 0.4kV on the LV side.

Loss indicators: no-load loss of 100W-1660W, load loss of 690W-15950W, no-load current of 0.6% -2.1%.

Short circuit impedance: 5.0% -6.0%, connection group Dyn11.

Application scenarios: urban road lighting, residential communities, and power distribution systems for small and medium-sized industrial enterprises.

2. 10kV distribution transformer

Core type: Three phase dual winding non excited voltage regulating distribution transformer, oil immersed structure.

Technical features: Independently designed by integrating advanced domestic and foreign technologies, using advanced iron core laminated inclined worktable and non pre laminated iron yoke process to ensure sufficient grain orientation of cold-rolled silicon steel sheets and significantly reduce no-load losses; It has the advantages of low loss, low noise, and no need for iron core cleaning, with outstanding safety, reliability, and economy.

Rated capacity: 30kVA-2000kVA, it is the most widely used model for civil and industrial low-voltage distribution.

Key parameters:

Voltage ratio: 6.3kV, 10kV, 11kV ± 2 × 2.5%, LV side 0.4kV.

Loss indicators: no-load loss of 100W-1960W, load loss of 600W-18000W, no-load current of 0.5% -2.1%.

Short circuit impedance: 4.0% -4.5%, connection group Dyn11.

Application scenarios: Terminal power distribution scenarios such as residential communities, commercial centers, schools, hospitals, and small and medium-sized factories.

3. Amorphous alloy core distribution transformer (energy-saving special series)

Core type: 10kV three-phase double winding non excited voltage regulating distribution transformer, amorphous alloy iron core structure.

Technical features: The core adopts amorphous alloy soft magnetic material, which reduces no-load loss by more than 50% compared to traditional silicon steel sheet transformers, and has significant energy-saving effects; Adopting single-phase or three-phase five column box type iron core and foil wound low-voltage winding, it has the advantages of low loss and strong short-circuit withstand capacity, and its overall performance reaches the international advanced level.

Rated capacity: 30kVA-2000kVA, suitable for distribution scenarios with high energy-saving requirements.

Key parameters:

Voltage ratio: 6.3kV, 10kV, 11kV ± 2 × 2.5%, LV side 0.4kV.

Loss index: no-load loss 33W-750W (much lower than traditional models), load loss 600W-17400W, no-load current 0.4% -1.5%.

Short circuit impedance: 4.0% -5.0%, connection group Dyn11.

Application scenarios: green buildings, energy-saving parks, new energy supporting distribution, commercial and industrial projects sensitive to energy consumption indicators.

（3） Special Purpose Transformer Series (Customized Industrial Solutions)

1. Dry type transformer (indoor safety equipment)

Core types: 35kV/10kV non excited voltage regulating dry power transformer, 35kV/10kV on load voltage regulating dry power transformer, resin casting process.

Technical features: Glass fiber mesh reinforced resin casting is adopted, and the coil is poured through flow control pump and static control technology to avoid crocodile cracks in the coil; Advanced pouring technology ensures that the resin mixture fully fills the gaps between the wire turns and segments, with high dielectric strength and partial discharge ≤ 5PC, suitable for indoor clean environments.

Rated capacity: 30kVA-25000kVA, covering indoor distribution needs of medium and low voltage.

Key parameters:

Voltage ratio: 35kV, 10kV ± 2 × 2.5%/± 4 × 2.5%, LV side 0.4kV, 6.3kV, 10.5kV, etc.

Loss index: No load loss 190W-27100W, load loss 710W-111000W, no load current 0.35% -2.0%.

Short circuit impedance: 4.0% -10.0%, connected to groups Dyn11, Yyn0, Yd11, etc.

Environmental adaptability: Indoor installation, working temperature -5 ℃ -+40 ℃, altitude<1000m.

Application scenarios: Indoor environments such as high-rise buildings, underground garages, data centers, hospitals, and clean rooms that require fire prevention, explosion prevention, and low pollution.

2. Rectification transformer (core of industrial DC power supply)

Core type: Oil immersed rectifier transformer, with WHRS series as the main model.

Technical features: Specially designed for power supply of rectification equipment, it is the core equipment for electrochemical electrolysis, electronic traction, DC transmission, variable frequency speed regulation, industrial rectification power supply and other scenarios. It has low loss and energy saving, and supports customized design according to load characteristics.

Rated capacity: 800kVA-16000kVA, voltage level 6kV-66kV.

Key parameters:

Voltage combination: Line side 6kV, 10kV, 11kV, 35kV, 66kV, Valve side 380V-1650V (including multi winding combination).

Connection groups: Dyn11, Dd0y11, Dy11, Dd0, etc., suitable for different rectifier circuit requirements.

Application scenarios: Industrial DC power supply scenarios such as metallurgical electrolysis, chemical electroplating, rail transit traction, DC motor drive, etc.

3. Furnace transformer (specialized equipment for industrial smelting)

Core types: electric arc furnace transformer, ladle refining furnace transformer, electric slag furnace transformer, calcium carbide furnace transformer, etc., including two types: non excited voltage regulation and on load voltage regulation.

Technical features: Through material, process, and structural innovation, it has the advantages of small size, light weight, high efficiency, low loss, low noise, reliable operation, and strong overload capacity, which can reduce power grid losses and long-term operation and maintenance costs. It is designed specifically for high-temperature melting scenarios.

Rated capacity: 650kVA-25000kVA, voltage levels: 6kV, 10kV, 35kV.

Key parameters:

Voltage combination: Primary side 6kV, 10kV, 35kV, Secondary side 75V-509V (suitable for low voltage and high current requirements of melting equipment).

Loss indicators: no-load loss of 1.9kW-30.4kW, load loss of 10kW-313.6kW, short-circuit impedance of 5.5% -21%.

Connection group: D-y, d0-11, Yd11, Dd0, etc. Cooling methods include oil immersion self cooling (OFAF) and forced oil circulation air cooling (OFWF).

Application scenarios: High temperature industrial melting scenarios in the metallurgical industry (alloy steel, ferroalloy melting), chemical industry (yellow phosphorus, calcium carbide, synthetic resin production), etc.

4. Voltage regulating transformer (voltage stability control equipment)

Core types: single-phase feeder automatic voltage regulator (WHVR-1 type), three-phase automatic voltage regulating transformer (WHVR-3 type), oil immersed autotransformer structure.

Technical features: Integrated voltage and current signal sampling, WHVR/SVR controller, on load tap changer control device, regulating load characteristics by increasing or decreasing voltage to achieve efficient operation of the power grid; The mechanical lifespan is up to 1 million cycles, the electrical lifespan is 50000 cycles, the voltage regulation accuracy is high, and the stability is strong.

Rated capacity: Suitable for voltage levels of 2.5kV-35kV, with capacity matched to grid loads as needed.

Key parameters:

Voltage regulation range: voltage regulation amplitude of 20%, 30%, 40%, voltage regulation steps of 7/9/16.

Environmental adaptability: Operating temperature -30 ℃ -+40 ℃ (single-phase)/-25 ℃ -+40 ℃ (three-phase), altitude ≤ 1000m (single-phase)/≤ 2000m (three-phase).

Application scenarios: compensation for power grid voltage fluctuations, stable supply voltage for precision equipment, voltage regulation for industrial production lines, and other scenarios.

5. Column mounted transformer (outdoor distributed distribution equipment)

Core types: single-phase pole mounted distribution transformer (oil immersed), fully self-protection (CSP) pole mounted transformer.

Technical characteristics:

Ordinary type: compliant with ANSI and IEC standards, oil immersed 65 ℃ temperature rise design, 100% full coverage of external welds, enhanced strength and corrosion resistance, concave protection of the bottom weld of the fuel tank, suitable for harsh outdoor environments.

CSP type: High/low voltage side integrated protection components with lightning protection, short circuit, and overload protection functions, which can avoid power outages in transmission and distribution lines caused by transformer failures and protect the safety of the power grid and equipment.

Rated capacity: 30kVA-100kVA, voltage level 6.35kV-13.8kV.

Key parameters:

Voltage ratio: HV side 6.35kV, 7.62kV, 11kV, 13.2kV, 13.8kV ± 2 × 2.5%/± 5%, LV side 0.22kV-0.24kV, 0.4kV.

Loss indicators: no-load loss of 30W-190W, load loss of 515W-1650W, no-load current of 0.8% -2.8%.

Short circuit impedance: 3.5% -6.0%, connection groups Ii0, Ii6, Dyn11.

Application scenarios: rural power distribution network, suburban power distribution, distributed power supply for road lighting, and power supply for small users in remote areas.

6. Box type/prefabricated transformer (integrated distribution equipment)

Pad mounted transformer:

Technical features: Integrated transformer body, high-voltage load switch, protective fuse and other equipment in the oil tank, compact structure, small volume, flexible and fast installation, easy operation, suitable for ring network and radiation network, high power supply reliability.

Rated capacity: 100kVA-1250kVA, voltage level 10kV-35kV.

Application scenarios: Outdoor power distribution scenarios such as industrial parks, residential communities, commercial centers, urban roads, high-rise buildings, etc.

Prefabricated Transformer:

Technical features: Integrating high-voltage electrical equipment, transformers, and low-voltage electrical equipment into one, divided into three functional areas: high-voltage compartment, transformer compartment, and low-voltage compartment; The high-voltage side supports multiple methods such as ring network power supply, terminal power supply, and dual power supply, and can be equipped with high-voltage measuring instruments; The transformer compartment can be equipped with low loss oil immersed or dry-type transformers, equipped with self starting forced air cooling and lighting systems; The low-voltage compartment supports drawer or cabinet structures and has functions such as power distribution, lighting distribution, reactive power compensation, and energy metering.

Rated capacity: customized according to demand, suitable for medium and large-scale distributed distribution needs.

Application scenarios: Integrated power distribution scenarios such as high-rise buildings, urban and rural buildings, industrial parks, mining areas, oil fields, temporary construction sites, etc.

7. Photovoltaic integrated substation and inverter station (new energy supporting equipment)

Technical features: Compact substation, capable of boosting the three-phase DC power output from photovoltaic panels to 11kV or 33kV three-phase AC power; Integrating the functions of a box type inverter station and a booster station to form an integrated photovoltaic power station, adapting to the needs of new energy grid connection.

System configuration: solar panel array → combiner box → DC unit → inverter → LV unit → transformer → MV unit → medium voltage grid, supporting multi unit parallel connection (such as 6 500kW units parallel output 3000kW).

Key features: Support customized design according to local power grid voltage levels and adapt to different regional new energy grid connection standards.

Application scenarios: centralized photovoltaic power stations, distributed photovoltaic industrial parks, new energy microgrids, and other scenarios.

（4） Other series of transformers

Single phase pole mounted transformers, fully self-protection transformers (CSP), stepper voltage regulators, three-phase stepper voltage regulators, etc., cover specialized distribution, fine voltage regulation, outdoor harsh environment power supply and other segmented scenarios, forming a product matrix covering all categories and scenarios.

General technical characteristics and environmental adaptability

（1） Core technological advantages

Energy saving: The entire series of products adopt low loss design, and the iron core is made of high magnetic conductivity cold-rolled silicon steel sheets (amorphous alloy core series uses soft magnetic materials). The coil winding process is optimized, and the no-load loss and load loss are at the leading level in the industry. Long term operation can significantly reduce energy consumption costs.

Reliability: Key components (iron core, coil, oil tank, seals) have undergone strict selection and testing, with complete redundancy design, strong short-circuit resistance, excellent sealing performance (oil immersed products can effectively prevent oil leakage and oxidation), and long service life.

Compatibility: Parameters such as voltage level, connection group, and short-circuit impedance are compatible with mainstream global power grid standards, and can be used in conjunction with different brands of high and low voltage electrical equipment, with strong interchangeability.

Maintenance convenience: The structural design is reasonable, and oil immersed products are equipped with maintenance components such as oil level gauges, thermometers, oil drain valves, and lifting ears. Dry products do not require oil maintenance, and the daily operation and maintenance workload is small.

（2） Environmental adaptability parameters

Temperature range: Most outdoor products operate at temperatures ranging from -30 ℃ to+40 ℃, some products (such as dry-type transformers) operate at temperatures ranging from -5 ℃ to+40 ℃, and storage temperatures range from -40 ℃ to+70 ℃.

Altitude requirement: default ≤ 1000m, temperature rise and other parameters need to be corrected if exceeding 1000m. Some products (such as CSP transformers) support altitudes ≤ 2000m.

Humidity conditions: Working humidity ≤ 90% RH (25 ℃, no condensation), to avoid internal moisture damage to the product.

Installation environment: It should be installed in a location free from corrosive gases, obvious pollution, and severe vibrations and impacts. Outdoor products should have wind, rain, and dust resistance capabilities.

Application scenarios and typical cases

（1） Core application areas

In the field of energy and power: power plants, substations, regional distribution networks, and new energy power stations (photovoltaic, wind power), undertake the core tasks of increasing voltage transmission and decreasing voltage distribution of electrical energy.

Industrial production fields: steel plants, chemical plants, metallurgical plants, calcium carbide plants, electrolysis plants, precision manufacturing parks, suitable for industrial scenarios such as smelting, electrolysis, traction, and precision power supply.

In the field of livelihood architecture: residential communities, commercial centers, high-rise buildings, schools, hospitals, data centers, providing terminal power distribution and secure power supply guarantee.

Infrastructure field: urban road lighting, rural power distribution network, remote area power supply, temporary construction sites, adapted to distributed and mobile power distribution needs.

（2） Typical installation case

220kV transformer: High voltage transmission system in steel plants, large regional substations.

35kV transformer: supporting equipment for steel plant furnaces and mining power distribution systems.

20kV transformer: distributed power supply for mines and distribution for industrial parks.

Photovoltaic integrated substation: a centralized photovoltaic industrial park grid connected system.