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Explore high-durability transformer technologies and combined metering gear engineered to meet Brazilian ABNT/NBR grid compliance and industrial operational standards.
In Brazil's fast-evolving electrical transmission and distribution ecosystem—governed by the National Electric System Operator (ONS) and regulated by ANEEL (Agência Nacional de Energia Elétrica)—the demand for highly accurate, rugged, and space-saving metering and protection hardware has surged. Three-phase Current Transformer and Voltage Transformer (CT-VT) combined units, locally referred to in the Brazilian market as Transformadores Combinados de Medição (TCM) or Conjuntos de Medição em Média Tensão, represent the gold standard for high-precision revenue metering (Medição de Faturamento - CCEE), tariff demarcation, and substation feeder protection.
As Brazilian utility concessionaires such as Enel Brasil, Neoenergia, CPFL Energia, Cemig, Copel, and Equatorial accelerate their grid modernization initiatives, the integration of three-phase CT-VT units in medium-voltage classes (specifically 13.8 kV, 15 kV, 24.2 kV, 34.5 kV, and 36 kV at standard 60 Hz) has become indispensable. Integrating three single-phase current transformers (CTs) and three single-phase potential transformers (VTs/PTs) or a combined multi-core layout inside a single hermetically sealed, oil-immersed tank or cycloaliphatic epoxy resin casting drastically minimizes substation footprint, cuts installation labor by over 50%, and eliminates cross-wiring errors during field commissioning.
Engineered for Brazil's free energy market (Mercado Livre de Energia - ACL) and CCEE compliance, delivering ultra-precise measurement across low and full dynamic load curves.
High creepage insulation (>31 mm/kV) tailored for extreme humidity, salt spray along coastal Brazil (Santos, Suape, Rio), and intense solar UV radiation.
Multi-core secondary configurations accommodating high-precision metering windings (Class 0.2S/0.3) alongside dedicated relay protection cores (10P20 / 5P20).
The Brazilian electricity sector is experiencing an unprecedented structural transition driven by Law No. 14,300/2022 (Marco Legal da Micro e Minigeração Distribuída) and the complete liberalization of the Free Electricity Market (Mercado Livre de Energia - Portaria Normativa nº 50/2022). High-voltage and medium-voltage consumers (Group A consumers, encompassing commercial facilities, cold storage hubs, automotive factories, and metallurgical complexes) are migrating en masse from the regulated market (ACR) to the free market. This commercial migration mandates the installation of dedicated, certified revenue metering booths equipped with 0.2S accuracy class CT-VT combined metering sets that interface flawlessly with digital meters (such as ION and Elster protocols) communicating via SCADA/GPRS with CCEE servers.
Furthermore, Brazil is experiencing a monumental buildout of distributed solar photovoltaic (PV) plants across Minas Gerais, Bahia, Piauí, and Goiás, alongside utility-scale wind farms across the Northeast (Rio Grande do Norte, Ceará). In these solar generation plants, three-phase CT-VT units serve as the primary electrical interface at the point of common coupling (PCC), continuously measuring active and reactive power flow (P & Q), detecting reverse power currents, and guaranteeing bi-directional metering accuracy with high thermal short-time withstand ratings (Ith up to 31.5 kA / 1s).
Supplying power transformers and instrument transformers to the Brazilian market demands rigorous compliance with the Associação Brasileira de Normas Técnicas (ABNT) as well as the International Electrotechnical Commission (IEC). Our manufacturing facilities implement robotic continuous-winding, ultra-low loss laser-treated silicon steel cores, and automatic vacuum epoxy potting / vacuum oil-filling to ensure strict conformity with Brazilian utility technical norms.
| Technical Parameter | Standard Brazil MV Distribution | Heavy Industrial & Solar Substation | High Voltage Substation Interconnect |
|---|---|---|---|
| Rated Voltage (Ur) | 13.8 kV / 15 kV (60 Hz) | 24.2 kV / 34.5 kV / 36 kV (60 Hz) | 69 kV / 72.5 kV / 110 kV (60 Hz) |
| Insulation System | Cast Resin Epoxy / Mineral Oil | Cycloaliphatic Epoxy / Ester Fluid | Hermetically Sealed Oil-Immersed |
| Lightning Impulse (BIL / NBI) | 95 kV / 110 kV | 150 kV / 170 kV | 325 kV / 350 kV / 450 kV |
| CT Accuracy Class (Medição/Prot) | 0.2S, 0.5 for Metering; 10P20 Prot | 0.2S High-Precision Multi-Ratio | 0.2S (CCEE Standard) + 5P20 / TPX |
| VT Accuracy Class & Burden | 0.2 / 0.3 / 0.5 (25VA to 75VA) | 0.2 (50VA to 100VA) Thermal 300VA | 0.2 / 3P (75VA to 150VA) |
| Applicable Norms | ABNT NBR 6855 / NBR 6856 | ABNT NBR / IEC 61869-1, 2, 3, 4 | IEC 61869 / ANSI IEEE C57.13 / ONS |
Brazil exhibits vast climatic diversity, ranging from the semi-arid conditions of the Sertão to the high humidity and heavy lightning density of the Amazon Basin and the aggressive saline atmospheres of the Atlantic coast. Standard CT-VT units often succumb to partial discharges, tracking, and premature bushing degradation if not properly tropicalized. Our combined transformers utilize hydrophobic cycloaliphatic resin (HCEP) casting for outdoor dry-type units and anti-corrosive hot-dip galvanized steel tanks with C5-M marine-grade polyurethane paint coatings for oil-immersed variants. Primary terminals feature tinned brass or silver-plated copper pads compatible with Brazilian NBR standardized NEMA 2-hole and 4-hole terminal lugs.
Explore how our custom Three-Phase CT-VT Combined Transformers are engineered to solve specific operational challenges across Brazil’s major economic engines.
In high-capacity utility solar farms across Bahia and Piauí, our 34.5 kV CT-VT metering sets provide high harmonic tolerance (up to the 50th harmonic order) generated by central string inverters, safeguarding billing data integrity and enabling high-speed directional overcurrent relay trips.
Supporting mega grain elevators, soybean processing mills, and sugarcane ethanol refineries in Mato Grosso, Goiás, and São Paulo. These units handle heavy inductive motor starting loads, voltage sag monitoring, and neutral displacement protection in isolated delta networks.
Designed to withstand severe industrial dust, vibration from ball mills and crushers, and severe short-circuit stresses. Equipped with specialized thermal overload protection and dual secondary tap configurations for scalable plant expansion.
Compact modular dry-type and pad-mounted CT-VT units integrated into internal switchgear cubicles (Cubículos de Média Tensão) in metropolitan centers like São Paulo, Rio de Janeiro, and Curitiba, complying strictly with concessionaire norms (e.g., CPFL GED-13, Enel CNC-OMBR).
Today, XINSANHUAN’s products are exported to more than 30 countries and regions worldwide. Its international footprint spans Europe, Central Asia, Southeast Asia, Africa, and Latin America, with successful projects completed in countries such as Russia, Kazakhstan, Uzbekistan, Kyrgyzstan, Ethiopia, Zambia, Tanzania, Mexico, Honduras, and many others.
The company’s products are widely recognized for their excellent operational performance, high efficiency, durability, and adaptability to diverse climatic and grid conditions, making them ideal for the expanding Brazilian power transmission and distribution landscape.
Quality excellence and customer satisfaction remain the core values that guide every aspect of XINSANHUAN’s business operations. Through strict quality assurance, reliable delivery schedules, and comprehensive after-sales support, the company has earned the trust and long-term cooperation of customers around the world.
Its commitment to providing dependable products and professional services has established a strong reputation within the global power equipment industry, offering Brazilian EPC contractors, utilities, and engineering firms certified reliability backed by international type-test reports.
Looking toward the future, Hanzhong Xinsanhuan Transformer Co., Ltd. will continue to uphold its philosophy of integrity, innovation, quality, and customer focus. By leveraging its strong technical expertise, advanced manufacturing capabilities, and global market experience, the company is committed to building long-term partnerships with customers worldwide and contributing to the development of safe, efficient, and sustainable power infrastructure. Together with its partners, XINSANHUAN strives to create greater value and shape a brighter future for the global energy industry.
Discover our full portfolio of power distribution transformers, neutral grounding equipment, and oil/dry-type systems engineered for Brazilian commercial and industrial operations.
