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Engineered to comply with NOM-001-SEDE, NMX-J, and international IEC/IEEE standards, offering uncompromised metering accuracy and substation resilience across Mexican industrial regions.
Mexico's electrical infrastructure is currently undergoing an unprecedented expansion driven by the monumental "Nearshoring" industrial wave across northern and central states such as Nuevo León, Coahuila, Querétaro, Chihuahua, and San Luis Potosí. Global manufacturing giants, automotive Tier-1 suppliers, semiconductor assembly units, and heavy industrial plants are establishing extensive facilities requiring robust medium-voltage connections. In this dynamic landscape, the CT-VT Combined Instrument Transformer (often classified locally as Medidor Combinado de Transmisión / MOF - Measurement OutFit) plays an indispensable role as the primary boundary device for electricity billing, accurate revenue metering, and micro-second relay protection.
Operated strictly under the grid framework established by the Comisión Federal de Electricidad (CFE) and monitored by the Centro Nacional de Control de Energía (CENACE), electricity off-takers and private substation operators in Mexico require combined instrument transformers that eliminate metering disputes, withstand extreme thermal variations from the Sonoran Desert to humid coastal corridors, and reduce substation physical footprint by merging current and voltage sensing into a single, synchronized, factory-tested unit.
Our CT-VT combined units and primary power transformers are custom engineered to match Mexico's specific nominal medium voltage levels and harsh regional environments:
Combining Current Transformers (CT) and Potential Transformers (PT/VT) in a single integrated enclosure optimizes substation layout, halves procurement cycles, minimizes field cabling errors, and guarantees highest measurement synchronization.
Equipped with high-permeability amorphous and grain-oriented silicon steel cores, our combined CT-VT sets deliver class 0.2S accuracy down to 1% of rated primary current. This ensures maximum revenue protection and eliminates metering drift for Mexican commercial tariffs (Gran Demanda Media Tensión GDMTO/GDMTH).
Featuring specialized VT damping windings and vacuum pressure impregnation (VPI) or vacuum epoxy casting, our transformers prevent ferroresonant overvoltages during system switching or line-to-ground faults commonly encountered on long radial Mexican transmission feeds.
Engineered for high-altitude installation (>2,500m above sea level in Toluca, Puebla, and Mexico City) with increased creepage distances (Class IV heavy pollution rated) for corrosion resistance in coastal environments like Veracruz, Tamaulipas, and Campeche.
| Parameter / Specification | 13.8 kV System Class | 23 kV System Class | 34.5 kV System Class |
|---|---|---|---|
| Rated Frequency | 60 Hz (Standard Mexico Grid) | 60 Hz (Standard Mexico Grid) | 60 Hz (Standard Mexico Grid) |
| Nominal System Voltage (Un) | 13.8 kV (L-L) / 7.97 kV (L-N) | 23.0 kV (L-L) / 13.28 kV (L-N) | 34.5 kV (L-L) / 19.92 kV (L-N) |
| Basic Impulse Level (BIL) | 95 kV / 110 kV Peak | 125 kV / 150 kV Peak | 170 kV / 200 kV Peak |
| CT Accuracy Classes & Burden | 0.2S, 0.5S / 5VA to 30VA (5A or 1A secondary) | 0.2S, 0.5S / 5VA to 30VA (5A or 1A secondary) | 0.2S, 0.5S / 5VA to 30VA (5A or 1A secondary) |
| VT Accuracy Classes & Burden | 0.2, 0.5 / 15VA to 50VA (120V / 115V / 69.3V secondary) | 0.2, 0.5 / 15VA to 50VA (120V / 115V / 69.3V secondary) | 0.2, 0.5 / 15VA to 50VA (120V / 115V / 69.3V secondary) |
| Applicable Mexican & Global Standards | CFE G0000-48, CFE VE100-13, NMX-J-109-ANCE, NOM-001-SEDE, IEEE C57.13, IEC 61869-1/2/3/4 | ||
From renewable solar plants under the Plan Sonora to high-capacity automotive assembly clusters, our CT-VT combined units provide unmatched operational continuity.
Serving as official fiscal metering units at the Point of Common Coupling (PCC) between private industrial substations and the CFE distribution grid. Delivers tamper-proof secondary terminal boxes equipped with optical seal provisions and multi-ratio CT switching capabilities.
Solar inverters and wind generation blocks inject fluctuating harmonic profiles into collector systems. Our CT-VT units feature high thermal withstand and low phase displacement, accurately recording bidirectional real and reactive power flow (MWh/MVArh) for CENACE wholesale market compliance.
In high-vibration, dust-laden open-pit mining environments in Sonora, Zacatecas, and Durango, our rugged oil-immersed and cast resin units supply reliable currents and voltages for feeder differential relays, distance relays, and SCADA automation.
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.
For the Mexican market specifically, we maintain dedicated export logistics routes directly to major ports including Manzanillo, Lázaro Cárdenas, Veracruz, and Altamira, ensuring rapid customs clearing, seaworthy reinforced packaging, and complete compliance documentation (including routine test reports, type test certificates, and NOM conformity validation).
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.
Every single CT-VT combined transformer and distribution unit undergoes 100% routine factory testing in accordance with IEEE C57.13 and IEC 61869 specifications prior to packing. Our digital partial discharge screening guarantees levels under 5 pC at rated test voltages, ensuring over 30 years of trouble-free operational life in harsh commercial environments.
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.
Explore our full line of oil-immersed, dry-type, amorphous alloy, rectifier, and substation main power transformers tailored for Mexican electrical contractors and utilities.
