SG(Z)(B)11 10kV non-encapsulated H-class dry power transformer
Brand: Henan Mingkong
Model: SG(Z)(B)11
Product Type: Indoor NOMEX Insulated Air-cooled On-load Regulation Dry Distribution Transformer
Rated Voltage: High Voltage 6kV / 10kV; Low Voltage 0.4kV, Adjustable range: 6~10±2×2.5%
Rated Capacity: 30kVA ~ 2500kVA
Core Feature : UL-certified NOMEX H-class insulation, open non-encapsulated air cooling coil structure, flame retardant, non-toxic & self-extinguishing, zero partial discharge, fully comply with GB6450 & IEC international power equipment standards
Key Advantage: Class 11 ultra-low loss, excellent heat dissipation and strong short-circuit resistance; supports 120% continuous overload & 140% 3-hour overload. Built-in on-load tap-changer for non-stop voltage adjustment, optional foil low-voltage winding, easy inspection & maintenance. Equipped with Dyn11/Yyn0 connection groups and 4.0%/6.0%/8.0% graded short-circuit impedance to fit various grids.
Application: Coastal grid upgrade, industrial substations, mines, underground pipe galleries, commercial complexes, new energy storage stations, high-temperature desert projects, tunnels & underground fire-proof power supply.
Introduction
A: Product Overview
SG(Z)(B)11 10kV non-encapsulated H-class dry power transformer, a three-phase dry-type power transformer, integrates outstanding safety, reliable operation, energy-saving performance, flame retardant and explosion-proof properties. It releases no toxic gas and causes zero environmental pollution, paired with effortless daily maintenance.
Boasting advanced structural layout, rational mechanical design and sleek exterior, all core performance indicators surpass GB6450 and IEC international standards. The transformer retains stable electrical and mechanical performance over its full service lifespan.
It is the ideal power distribution solution for scenarios with strict fire safety rules, volatile load fluctuations, dusty, humid or corrosive surroundings, including high-rise buildings, airports, transport terminals, subway tunnels, hospitals, power plants, metallurgical workshops, commercial malls, residential complexes, petrochemical factories and nuclear power stations.
B: Model meaning
C: Features
- High and low voltage coils are made of Nomex insulation material, and are impregnated with international advancedagent-free varnish by VPl vacuum pressure equipment. The external high-strength H-grade insulation material issealed and cured at high temperature to ensure no partial discharge under operating conditions
- High-voltage coils have high mechanical strength and good heat dissipation conditions (high and low voltage coils usea continuous structure of Nomex insulation materials that can be used for more than 200°C for a long time), whichavoids high voltage between layers of multi-layer cylindrical coils and poor heat dissipation. It has the disadvantagesof easy thermal breakdown and low mechanical strength, thus improving the reliability of product operation.
D: Technical Parameters
E: Long-Standing Difficulties Faced by Global B-End Purchasers & Targeted Technical Solutions
After analyzing the SG(Z)(B)11 model coding diagram and complete technical parameter table, global engineering contractors, mineral resource developers, new energy investors and factory procurement teams have long encountered four typical operational and procurement challenges. All these difficulties can be fully resolved through the standardized design and complete parameter configuration of our SG(Z)(B)11 non-encapsulated dry type power transformer.
Difficulty 1: Ambiguous model coding triggers incorrect specification selection and project schedule delays
Most overseas project teams do not equip full-time professional electrical engineers. Complicated transformer model symbols tend to create misjudgment on rated capacity, voltage class and winding structure. Once mismatched products are ordered, cross-border re-delivery and customs return will generate substantial extra logistics expenses and stall overall construction progress.
Corresponding Solution: Standard SG(Z)(B)11 model symbol interpretation diagram
The classification chart fully explains the definition of each letter and number in SG(Z)(B)11: S stands for three-phase, G for air-cooled dry type, (Z) for on-load voltage regulation, (B) for low-voltage foil winding, 11 for Class 11 ultra-low energy loss, followed by rated capacity and voltage grade.
Procurement personnel can rapidly confirm the model matching local 10kV grid specifications, eliminating repeated cross-border communication errors.
Difficulty 2: Fluctuating regional grid voltage leads to frequent equipment breakdown and production suspension
Numerous regional power grids feature dramatic voltage fluctuation between peak and off-peak consumption periods. Conventional dry transformers require power cut for manual tap adjustment, which results in factory production shutdown and power generation loss of photovoltaic energy storage stations. Abrupt voltage surges will burn supporting PLC, distribution cabinets and other core electrical devices.
Corresponding Solution: Integrated (Z) on-load voltage regulation module
The SG(Z)(B)11 series adopts standard 6~10±2×2.5%/0.4kV voltage combination, enabling real-time voltage adjustment without power interruption. Two mainstream connection groups (Yyn0, Dyn11) are compatible with most regional power distribution systems, stabilizing output voltage all year round and avoiding equipment damage caused by unstable power supply.
Difficulty 3: Excessive transformer operating loss raises long-term operational expenditure
Traditional dry transformers come with high no-load loss and load loss, imposing persistent power consumption pressure on industrial parks, open-pit mines and energy storage power stations. Meanwhile, local power regulatory authorities implement strict energy efficiency filing standards; transformers failing to meet loss indicators cannot pass official acceptance and tender review.
Corresponding Solution: Full-capacity Class 11 low-loss parameter specification sheet
Our technical table covers all models ranging from 30kVA to 2500kVA, with accurate classified data of no-load loss, load loss and no-load current. Class 11 high energy efficiency design effectively reduces long-term power waste. All performance indicators comply with IEC international standards, and printed parameter sheets can be directly applied to local energy efficiency certification and bidding documents.
Difficulty 4: Mismatched short-circuit impedance brings latent safety hazards to power systems
Improper short-circuit impedance will cause coil burnout and full-system collapse under sudden short-circuit current surges, which is a prominent hidden risk for power grids with weak power supply capacity. Non-standard customized impedance fails to match regional grid short-circuit capacity, lifting post-installation maintenance and component replacement costs.
Corresponding Solution: Graded standardized short-circuit impedance options
The parameter table clearly marks three fixed impedance grades: 4.0%, 6.0% and 8.0%, corresponding to different capacity segments of SG(Z)(B)11 dry transformers. The standardized anti-short-circuit structure delivers reliable protection for downstream power equipment, cutting long-term operational failure costs for project owners.
F: Value Guidance for Global Purchasers
We operate as a direct factory manufacturer and exporter of SG(Z)(B)11 Non-encapsulated H-class dry power transformer. Complete model coding diagrams, full technical parameter sheets and official factory test certificates are delivered alongside every shipment.
Customizable voltage grades, capacity and insulation configurations are available for mining facilities, coastal industrial zones, urban grid renovation and new energy storage substations, with comprehensive remote technical guidance for overseas on-site installation and daily operation.
If you require complete SG(Z)(B)11 technical datasheets or customized project quotations, our professional sales team is available for consultation at any time.
