500kVA 630kVA 800kVA 1250kVA Distribution Transformer Manufacturer

Product Description

Product Description

TSTY supplies a full lineup of distribution transformers with capacities starting at 30kVA up to 31,500kVA and higher. We provide both oil-immersed and dry-type transformers, suited for common distribution voltages: 6kV, 11kV, 22kV and 33kV.

Our transformers are built following IEC 60076 and GB/T 6451 specifications. Customization options cover voltage combinations, vector groups such as Dyn11, impedance voltage and protection classes. TSTY's equipment is shipped to more than 100 countries and territories. Widely deployed for grid upgrading, industrial zones, commercial premises and renewable energy initiatives.

Product Parameters

Rated Power	Economic load range	Typical application scenarios
100kVA	70-85kW	Small shops, rural power grid
250kVA	180-210kW	Small and medium-sized businesses and small factories
500kVA	300-380kW	Small and medium-sized factories and commercial complexes
630kVA	~500kW	Residential communities and prefabricated substations
800kVA	600-680kW	medium-sized factories, data centers
1250kVA	900-1060kW	Large factories and commercial complexes
1500kVA	1100-1270kW	Large-scale industrial and data center

1. 100KVA DISTRIBUTION TRANSFORMER

The 100kVA model is the starting capacity of our distribution transformer range, designed to meet low-volume power demand scenarios. Common use cases: Small retail stores, dining establishments, low-rise residential blocks, rural grid renovation, municipal street lighting and more.

Recommended operating load: Roughly 70-85 kW (calculated at 85% load factor). Rated current on the low-voltage side (0.4kV): Around 144 A.

Selection advice: The 100kVA transformer works perfectly for minor projects that have few electrical loads and modest total power requirements. If you plan to expand power capacity later, we suggest choosing 160kVA or 200kVA from the beginning. This helps prevent early replacement of the transformer.
 

2. 500KVA DISTRIBUTION TRANSFORMER

The 500kVA transformer is a widely used capacity model for power distribution in small and medium-sized industrial and commercial scenarios. It belongs to the small-sized transformer category, which generally covers all transformer capacities of 630kVA and below.

Typical application scenarios: Medium and small factories, commercial comprehensive buildings, distributed photovoltaic power stations, mine power supply systems and other projects.

Optimal operating load range: Approximately 300 to 380 kW.

Low-voltage side rated current (0.4kV): Approximately 722 A.

Selection note: 500kVA represents an important threshold in transformer sizing. One single 500kVA transformer can satisfy the power demand of most small and medium enterprises, capable of feeding several production lines as well as lighting and office loads. Where inductive loads like electric motors make up the bulk of consumption, it is advisable to upsize the transformer moderately or opt for a model with strong overload performance.
 

3. 630KVA DISTRIBUTION TRANSFORMER

630kVA stands out as a key benchmark capacity for distribution transformers. It defines the top end of the small transformer range and is also the advised maximum rating for oil-immersed transformers used in distribution substations.

Typical applications: Power supply for residential communities, commercial buildings, power & lighting loads of industrial and mining facilities, rural grid renovation, box substations, photovoltaic power stations, and so on.

Economic operating load range: Around 500kW

Low-voltage side rated current (0.4kV): Roughly 909A

Selection note: 630kVA is widely regarded as the typical maximum rating of oil-immersed transformers deployed in distribution substations. For residential estates, one 630kVA unit can cater to the power consumption of roughly 200-300 households, estimated on an allocation of 3-5kW per household. This capacity also delivers excellent cost efficiency when adopted for box-type substations.


4. 800KVA DISTRIBUTION TRANSFORMER

800kVA kicks off the medium-capacity segment for distribution transformers. Sitting between 630kVA and 1000kVA, this rating fits projects featuring heavier load densities and more stringent power supply reliability criteria.

Typical applications: Mid-sized manufacturing plants, large commercial plazas, data centers, municipal infrastructure facilities, etc.

Economic operating load range: Approximately 600-680kW

Low-voltage side rated current (0.4kV): Around 1155A

Selection tip: 800kVA is often used in scenarios requiring more capacity than 630kVA but not quite reaching the 1000kVA load level. In box-type substation projects, 800kVA units are frequently paired with 630kVA and 1000kVA units to create tiered power supply solutions. For medium-sized factories experiencing rapid load growth, an 800kVA transformer offers more ample redundancy.


4. 1250KVA DISTRIBUTION TRANSFORMER

1250kVA is widely recognized as an optimal capacity choice for industrial and commercial power distribution of medium and small scale. It works exceptionally well for projects expecting fast load rise, high peak power draw, and reserved capacity for future expansion.

Typical application scenarios: Electronic manufacturing workshops, mechanical processing factories, food production plants, commercial complexes, hotels, hospitals, data centers, EV charging hubs, new energy power stations, etc.

Economic operating load range: Approximately 900-1060 kW

Low-voltage side rated current (0.4 kV): Roughly 1804 A


Selection Tip: The 1250kVA model is ideal for industrial projects where a single production line requires 500-800 kW, and the total demand-including office and lighting loads-falls within the 800-1500 kVA range. It handles peak loads effectively while maintaining a 15%-20% redundancy margin, preventing the awkward situation of needing an upgrade immediately after commissioning. It is also a common choice for commercial complexes and hotels-buildings where air conditioning and elevators account for a significant portion of the load and peak demand fluctuations are pronounced.

 

Customer Case

After-sales service

1. Our company offers project and process design services. We can customize product design and fabrication in line with your equipment procurement schedule and unique requirements, and deliver technical and operational training for your staff.
2. For newly delivered units, we supply online support during installation and commissioning. Lifelong service is available for all products. Should any faults arise under normal operation, we will propose solutions within one working day upon receipt of your report, and make every effort to restore equipment operation promptly. Our professional technicians will also conduct periodic follow-up visits to guarantee long-term safe and reliable operation.
3. We adopt genuine high-quality raw materials and carry out production in strict accordance with ISO9001:2000 international quality management standards, to ensure superior product quality and hassle-free installation.

 

Packaging & Shipping

Company Profile

 

• 180 core patents, covering international certification systems such as IEC, UL, CE, and GOST
• Led or participated in the formulation of 8 IEC international standards
• 95% automation rate with micron-level machining precision
• 40% faster response time for product customization; delivery cycles shortened to 15-20 days
• Workforce of 600 employees, including a technical R&D team of over 200 specialists
• Production energy consumption 15% lower than the industry average, helping customers achieve carbon neutrality goals
• Product first-pass yield exceeding 99%; overseas failure rate 90% lower than the industry average
• Comprehensive full-lifecycle services for power equipment, including O&M, engineering support, and digital management capabilities

TSTY delivers more than just a transformer; we deliver a comprehensive quality commitment-spanning raw materials to factory dispatch and design to O&M-that is quantifiable, traceable, and verifiable.

FAQ
Q: Who are we?
A:We are a big professional manufacturer of oil immersed transformer, dry type transformer, transformer substation,HV and LV switchgear, established in 2011 year .

Q: Why should you buy from us not from other suppliers?
A:As an enterprise specializing in transformer production for 12 years. ISO9001-2008, OHSAS 18001:2007, ISO4001:2004L .CE,CCC,UL,CSA,TYPE TEST REPORT,etc certificates,Products match IEC, IEEE, ANSI, , GOST standard, we have high quality, fast delivery,guarantee after-sales service and factory price.

Q: How do transformers been shipped?
A: Transformers always been delivered by ship,train or truck for oversea,which with main active body in bulk and accessories in wooden cases.

Q: Can your product be customerized? 
A: Considering differences in voltage, frequency and other speciality of transformer product in different countries and
regions,our product can be customerized according to your requirements.

Q: Do you offer guarantee for the products? 
A: Yes. We offer at least two years guarantee for all of our transformers. 

Q: Do you accept FAT(Factory Acceptance Test)? 
A: Yes. It's available. We are responsible for each set transformer's testing. 

Q: Do you assign engineer for after-sale service?
A: Yes. For our products,we all show after-sale guide installation adn question inquiry.