The 10kV NX3 cast-resin distribution transformer delivers verified low no-load and load losses with vacuum-cast foil windings, meeting rigorous efficiency requirements for indoor power distribution. Operating as an oil-free and fire-safe unit, it ensures reliable electrical performance across demanding industrial and commercial facilities.
Modern electrical distribution installations demand high efficiency, thermal stability, and low maintenance overheads, particularly within enclosed urban infrastructure where space and fire safety are critical constraints. This dry-type distribution transformer addresses core site challenges by eliminating combustible insulating oils and implementing advanced epoxy-resin vacuum casting. Rated from 100 kVA to 2500 kVA, the unit utilizes copper or aluminum conductor configurations with Dyn11 or Yyn0 vector groups to step down medium voltage to standard low-voltage 0.4 kV distribution levels. The integration of high-grade grain-oriented silicon steel cores significantly suppresses core loss and acoustic noise. Furthermore, its compliance with GB20052-2024 Energy Efficiency Grade 3 guarantees optimized long-term operational expenditure and reduced carbon footprints for facility managers.
Technical Specifications
Rated Capacity: 100 kVA - 2500 kVA @ 50 Hz / 60 Hz
Primary Voltage: 10 kV @ Rated Tap
Secondary Voltage: 0.4 kV @ No-Load
Vector Group: Dyn11 / Yyn0 @ Standard Configuration
Efficiency Grade: GB20052-2024 Grade 3 @ Reference Temperature 75°C
Cooling Method: AN / AF (Air Natural / Air Forced) @ Enclosed Operation
Winding Material: Copper or Aluminum @ Foil Winding Design
Insulation System: Class F / H @ Thermal Endurance
Partial Discharge Level: <= 10="" pc="">
Enclosure Protection Class: IP20 / IP21 / IP23 @ Indoor/Outdoor Selection
System Integration and Hardware Setup
The mechanical installation of this dry-type transformer utilizes a robust structural base equipped with bidirectional flat wheels for horizontal and vertical alignment, alongside foundation fixing bolt holes for permanent seismic anchoring. Enclosure protection classes range from indoor IP20 or IP21 to weather-resistant IP23 variants, preventing ingress of foreign objects and dripping water. High-voltage terminals feature open-type porcelain bushings or separable elbow cable connectors, while low-voltage terminals accommodate multiple parallel cables or rigid busbar connections. An off-circuit tap-link mechanism, adjustable at plus/minus 5% or plus/minus 2 times 2.5%, allows voltage ratio adaptation only when the equipment is entirely de-energized. Temperature control and monitoring interfaces incorporate PT100 platinum sensors embedded directly within the low-voltage windings, connected to an intelligent controller that provides alarm and trip relay outputs, optional RS485 communication ports, 4-20 mA analog transmission, and automated cooling-fan power supply control.
Substation room layout practices dictate that high-voltage cables enter via bottom cable trenches or top ceiling conduits, maintaining strict physical separation from low-voltage circuits. Power cables and temperature signal control wiring must be routed in independent metallic conduits using shielded twisted-pair cables to mitigate electromagnetic interference. Low-voltage busbars require flexible expansion links to absorb thermal expansion and vibration stress during load fluctuations, with mechanical strain-relief fittings installed at all terminal connection points. The metallic enclosure, magnetic core, and structural clamping frames must be reliably bonded to the facility grounding grid in compliance with international IEC and national electrical installation standards.
Working Principle and Performance Design
The high-voltage winding employs advanced foil conductors and high-grade insulating film layer-wound configurations, processed through vacuum-casting with epoxy resin inside a heated mold. Vacuum degassing eliminates microscopic air pockets to achieve exceptionally low partial discharge levels, while the matched thermal expansion coefficients of the conductor and cured resin enhance crack resistance under thermal cycling. The low-voltage winding utilizes continuous copper or aluminum foil strips with inter-layer insulation, oven-cured into a rigid monolithic cylinder that provides superior resistance to moisture and high mechanical dynamic forces during short-circuit events. Because the foil-winding structure results in a single turn per layer, the voltage gradient across adjacent turns remains exceptionally low, conferring superior impulse and power-frequency voltage withstand capabilities compared to traditional round-wire wound alternatives.
The performance design orientation relies heavily on the oil-free epoxy-cast structure, which inherently eliminates fire hazards, toxic gas emissions, and routine liquid sampling requirements. The combination of a multi-step mitered core built from grain-oriented silicon-steel laminations and precision foil windings minimizes harmonic losses and audible humming noise. The cooling configuration supports self-cooled air natural operation, with optional thermal-activated fans expanding overload capacity during peak demand cycles. Short-circuit impedance values and connection vector groups like Dyn11 facilitate stable parallel operation and harmonic current suppression. Energy efficiency progressions categorize loss levels sequentially, where Grade 3, Grade 2, and Grade 1 tiers provide structured reductions in total electrical losses for diverse operational mandates.
Application Scenarios and Selection Guide
Suitable deployment environments include data centers, hospitals, commercial complexes, and modern office towers, where strict limitations on acoustic noise, fire containment, and proximity to occupied spaces dictate equipment selection. Industrial manufacturing plants, rail transit networks, and port facilities utilize compact prefabricated substations housing this transformer alongside medium-voltage switchgear to minimize physical footprint requirements. Specialized applications such as wind turbine towers, marine vessels, and offshore platforms demand customized corrosion-resistant coatings and vibration-damped mountings. Selection parameters must carefully evaluate local noise emission ceilings, required ingress protection ratings, building dimensional constraints, and regional energy efficiency mandates.
The systematic selection process proceeds by first matching the primary system voltage tier, determining the precise kVA capacity rating, and selecting the mandatory energy efficiency grade based on lifecycle economic evaluations. Engineers must specify enclosure protection types, indoor or outdoor installation layouts, ambient temperature profiles, and altitude derating factors before finalizing technical requisites. Applicable compliance standards include international IEC specifications, national electrical codes, and GB20052-2024 energy efficiency certifications, backed by routine factory type tests covering lightning impulse, temperature rise, and short-circuit mechanical strength. Optional customization items such as specialized tap changers, integrated electrostatic shields, or dual low-voltage outputs remain available for specialized project specifications. When planning complex distribution upgrades, technical teams can collaborate with Beijing Zhongping Technology to acquire detailed cross-reference selections and verified stock availability.
Frequently Asked Questions (FAQ)
1. What is the current stock availability and delivery lead time for standard ratings?
Standard capacities are maintained within regional warehouse inventories to support immediate dispatch, while customized configurations require scheduled manufacturing timeframes provided by Beijing Zhongping Technology.
2. What warranty coverage and RMA procedures apply to this distribution transformer?
The unit is backed by a comprehensive 12-month operational warranty covering manufacturing defects, supported by factory test documentation and technical service coordination through Beijing Zhongping Technology.
3. What are the nominal primary and secondary voltage ratings for this model?
The transformer operates at a rated primary voltage of 10 kV and steps down to a standard secondary voltage of 0.4 kV under no-load conditions.
4. What vector group configurations and short-circuit impedance values are supported?
Standard configurations utilize Dyn11 or Yyn0 vector groups with optimized impedance percentages designed to support stable parallel operations and fault-current limitations.
5. What environmental protection ratings and temperature limits apply during operation?
Enclosures are available in IP20, IP21, and IP23 ratings, designed to operate continuously within standard ambient temperature limits ranging from -25°C to 40°C.
6. What mechanical installation guidelines govern foundation fixing and busbar connection?
The base frame includes fixing bolt slots and swivel wheels for precise alignment, while low-voltage terminals require flexible copper links to prevent mechanical stress from thermal expansion.
7. What routine maintenance procedures are recommended to ensure long-term reliability?
Routine upkeep involves periodic dust removal from winding surfaces using dry compressed air, inspection of temperature controller connections, and verification of enclosure grounding integrity.
8. How does the epoxy vacuum-casting technology improve partial discharge suppression?
Vacuum degassing during the resin-casting process eliminates trapped air voids within the insulation matrix, resulting in partial discharge levels below 10 pC under rated operating voltage.
FAQ
1.Who are We?
Beijing Zhongping Technology Co., LTD., is a global industrial electrical automation service provider, is a scientific research, design, marketing, technical services, industrial Internet, international import and export services as one of the science and technology companies.
2.What can you buy from us?
PLC, inverter, human-machine interface, hydraulic products, low-voltage power distribution, industrial robots and core components
3.Is the item in stock or need to be purchased from another supplier?
We have a large inventory of goods and have our own warehouse.
4.What advantages do we have over other suppliers?
Our company has a large amount of inventory and a number of warehouses, but also in the country's important industrial provinces and cities with offices and a number of overseas service points. To provide you with intelligent manufacturing one-stop comprehensive services, save efforts, labor and cost.
5.Can you provide 100% new original authentic products?
We only sell new original genuine, no renovation, no fake, only for the original factory original!
6.How long is the delivery time?
If there is a stock, it will take 2-3 working days to ship, if the quantity is large, it will take 5-7 working days after receiving the payment, if it is not a conventional model, it will take some time, we will inform you of the specific delivery time.
7.Is there technical support available?
Of course, we have a professional technical team that can help you solve technical problems.
8.How do we guarantee quality?
We have three processes to control the quality of goods.
1) Our engineers will inspect the production and quality control in the factory regularly.
2) Incoming materials shall be inspected by experienced purchasing engineers before they can be stored.
3) At least 2 people in the logistics department cross-check the goods to be sent before delivery.
9.Can you guarantee the safe and reliable delivery of your products?
Yes, we strictly adopt the international standard packing. We also use special packaging for dangerous goods, and refrigerated shipping for items with temperature requirements. Special item packaging and general cargo standard packaging requirements may incur additional costs.
10.How about the freight?
The cost depends on how you choose to get the goods. Express is usually the fastest but also the most expensive way. Sea freight is the best solution for large quantities of goods. The exact shipping cost depends on the purchase amount、quantity and weight of your order. Please feel free to contact us for more information.
+86 010-64225983
+8613811814778
Building 26, Liyuan Community, Chaoyang District, Beijing, China
