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Explore our flagship transmission, grounding, and distribution apparatus deployed across provincial and state grid substations for optimized voltage conversion, instrument precision, and transient protection.
Current Transformers (CT) and Potential/Voltage Transformers (PT/VT), collectively known as Instrument Transformers, serve as the indispensable sensory nerve system of electrical substations across State Grid transmission and regional distribution nodes.
State Grid substations handle massive cross-regional energy bulk transfers requiring 0.2S and 0.1 class accuracy. CTs and PTs scale massive megavolt and kiloampere parameters down to standardized 100V/110V and 1A/5A signals without phase shift or ratio distortion.
During severe short-circuit faults, CTs must avoid magnetic core saturation under high transient asymmetric currents (5P20, 10P30, and TPX/TPY/TPZ transient cores) to guarantee microsecond differential protection tripping and prevent cascading blackouts.
Modern State Grid transformations utilize Electronic Voltage and Current Transformers (EVT/ECT) coupled with Merging Units (MU) transmitting sampled values (SV) over optical fiber process buses, eliminating electromagnetic interference and copper cabling hazards.
In high-voltage transmission substations (110kV, 220kV, 330kV, 500kV) and medium-voltage distribution networks (10kV, 20kV, 35kV), CT and PT transformers operate under stringent environmental, mechanical, and dielectric stresses. The architectural topology of transmission and distribution demands distinct transformer behaviors:
Engineered in compliance with IEC 61869-1/2/3/5, GB/T 20840, and State Grid Corporation of China (SGCC) corporate procurement guidelines, ensuring resilient dielectric strength, thermal capacity, and measurement stability.
| System Voltage Class | Apparatus Type | Insulation Medium | Accuracy Class (Metering / Protection) | Short-Time Thermal Current (Ith) | Key Application Scenario |
|---|---|---|---|---|---|
| 110kV – 220kV | Inverted Oil-Immersed / Gas-Insulated CT | Mineral Oil / SF6 Gas / Optical | 0.2S, 0.1 / 5P20, 5P30, TPY | 40kA – 63kA (3s) | High-Voltage Transmission Busbars & Lines |
| 110kV – 220kV | Capacitor Voltage Transformer (CVT) | Dielectric Paper-Oil + Capacitor Stack | 0.2, 0.5 / 3P, 6P / Carrier PLC | Continuous Overvoltage 1.9 Un | Grid Revenue Metering & PLC Telecommunication |
| 35kV – 66kV | Cast Resin / Oil Immersed CT & PT | Epoxy Resin / High-Grade Mineral Oil | 0.2S, 0.5 / 5P10, 10P20 | 25kA – 31.5kA (3s) | Regional Substations & Wind/Solar Step-Up Stations |
| 10kV – 20kV | Epoxy Dry-Type CT/PT Unit (JLS/JDZ) | Vacuum Cast Cycloaliphatic Resin | 0.2S, 0.5S / 10P15 / Zero-Seq | 16kA – 20kA (1s) | Distribution Ring Main Units (RMU) & Feeder Automation |
The global transition toward carbon neutrality and smart grid modernization has triggered rapid technological advancements in instrument and power transformer design. Today's State Grid operators require transformers equipped with digital diagnostics, condition-based maintenance (CBM), and eco-friendly insulating media.
1. Non-Conventional Instrument Transformers (NCIT): Optical Current Sensors utilizing the Faraday magneto-optic effect and Fiber-Optic Voltage Sensors based on the Pockels electro-optic effect are replacing traditional iron-core units. These optical systems exhibit zero magnetic saturation, wide dynamic bandwidth from DC to megahertz, and complete galvanic isolation.
2. AI-Powered Online Partial Discharge (PD) & DGA Monitoring: Through integrated ultra-high frequency (UHF) sensors, acoustic emission detectors, and Dissolved Gas Analysis (DGA), artificial intelligence models analyze real-time phase-resolved partial discharge (PRPD) patterns to predict insulation degradation before catastrophic breakdown occurs.
3. Eco-Friendly Ester Fluids & Non-SF6 Technologies: To minimize greenhouse gas emissions and explosion risks, synthetic and natural ester biodegradable fluids are gaining rapid adoption in both main power transformers and oil-filled instrument transformers across sensitive municipal and watershed regions.
Hanzhong Xinsanhuan Transformer Co., Ltd. is a professional transformer manufacturer located in Hanzhong City, Shaanxi Province, China—a renowned historical and cultural city known for its strategic geographical location at the heart of the country. Since its establishment, the company has been dedicated to the research, development, design, manufacturing, and service of high-quality power transmission and distribution equipment, providing reliable solutions to customers across domestic and international markets.
The company specializes in the production of power transformers up to 110kV, rectifier transformers, amorphous alloy transformers, oil-immersed distribution transformers, dry-type transformers, compact prefabricated substations, and other customized transformer solutions. With years of industry experience and continuous technological innovation, XINSANHUAN has developed a comprehensive product portfolio capable of meeting the diverse requirements of power utilities, industrial facilities, renewable energy projects, infrastructure developments, and commercial applications.
To ensure the highest standards of product quality and performance, the company has invested heavily in advanced manufacturing equipment, modern production lines, and comprehensive testing facilities. Supported by a highly qualified engineering and technical team, XINSANHUAN maintains strict quality control throughout every stage of production, from design and raw material procurement to manufacturing, testing, and final delivery. The company’s robust research and development capabilities enable it to continuously improve product efficiency, reliability, and environmental performance in response to evolving market demands.
Since 2006, Hanzhong Xinsanhuan Transformer Co., Ltd. has established a comprehensive management system and obtained a series of internationally recognized certifications, including ISO 9001 Quality Management System Certification, ISO 14001 Environmental Management System Certification, and ISO 45001 Occupational Health and Safety Management System Certification. The company has also received Energy-Saving Product Certification and has been honored with the title of Green Factory, reflecting its commitment to sustainable manufacturing practices and environmental responsibility.
As a recognized High-Tech Enterprise, XINSANHUAN places strong emphasis on technological advancement and intellectual property development. The company has obtained numerous national patents covering product design, manufacturing processes, and technical innovations. In addition, its products have achieved CE certification, enabling compliance with European market requirements and facilitating exports to a broader international customer base. The company also holds independent import and export rights, ensuring efficient global trade operations and responsive customer service.
Explore our full line of 110kV/35kV/20kV/10kV power transformers, distribution solutions, and grounding devices engineered for superior efficiency, short-circuit withstand, and long-term grid endurance.
