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Engineered to withstand severe electrical stress, transient surges, and demanding environmental conditions in utility-scale state grid networks.
Navigating the rapid expansion of Extra-High-Voltage (EHV) and Ultra-High-Voltage (UHV) transmission networks worldwide.
In contemporary high-voltage (HV), extra-high-voltage (EHV), and ultra-high-voltage (UHV) electrical networks ranging from 110kV, 220kV, to 750kV and above, the Capacitive Potential Transformer (CPT), also universally recognized as the Coupling Capacitor Voltage Transformer (CCVT) or Capacitive Voltage Transformer (CVT), represents a core cornerstone of grid instrumentation. Unlike traditional electromagnetic potential transformers (which become prohibitively bulky, heavy, and costly at voltage levels above 110kV), capacitive potential transformers deliver an optimal balance of economic viability, precise step-down transformation, and dual-purpose telecommunications capability.
Within national state grid infrastructures, CPTs step down high primary transmission line voltages into standardized, highly accurate secondary voltages (typically 100V, 110V, $\sqrt{3}$ scaled outputs). These calibrated signals are fed directly into revenue-grade fiscal energy meters, distance protection relays, automatic synchronizers, and digital disturbance fault recorders (DFRs). Concurrently, the integrated capacitive divider serves as a high-frequency coupling capacitor, facilitating Power Line Carrier (PLC) telecommunication channels for supervisory control and data acquisition (SCADA) telemetry and inter-substation protective relay tripping commands.
Delivers continuous Class 0.2 and 0.5 accuracy under fluctuating thermal conditions, ensuring strict fiscal settlement compliance across cross-regional power interchanges and bulk wholesale nodes.
Provides ultra-fast transient voltage responses during line faults, preventing directional relay blind spots and activating breaker trip coils within milliseconds to protect main substation power transformers.
Acts as the bridge coupling medium for high-frequency tele-protection and grid monitoring signals (50kHz to 500kHz) superposed on overhead transmission lines without requiring extra fiber rollouts.
Uncompromising engineering designed for electrical resilience, harmonic mitigation, and long-term thermal endurance.
A high-performance Capacitive Potential Transformer comprises two fundamental sub-assemblies: the capacitive voltage divider (consisting of high-voltage capacitor $C_1$ and intermediate-voltage capacitor $C_2$ hermetically sealed within porcelain or composite silicone rubber housings) and the base electromagnetic unit (EMU). The primary line voltage is divided across $C_1$ and $C_2$, presenting an intermediate tap voltage (typically 10kV to 20kV) to the intermediate voltage transformer (IVT).
To eliminate phase angle errors caused by the internal capacitive reactance at power frequencies (50Hz / 60Hz), a high-precision inductive compensation reactor is tuned in series with the intermediate transformer primary winding. Furthermore, because non-linear inductive saturation can interact with the capacitive stack during switching surges or clearing line faults, modern state-grid-grade CVTs incorporate active or passive Ferroresonance Suppression Circuits (FSC) across the tertiary auxiliary damping winding, quenching subharmonic oscillations within fractions of a cycle.
Deploying robust measurement and protective voltage instrumentation across diversified grid topographies.
Installed directly on overhead incoming and outgoing transmission bays. Provides real-time voltage magnitude, phase angle, and frequency signals to supervisory busbar differential relays, synchro-check systems, and automated line reclosers.
Interfaces renewable energy farm collector busses with regional utility grids. Effectively captures harmonic distortions, rapid voltage fluctuations, and transient voltage sags caused by inverter switching and variable atmospheric generation.
Maintains ultra-low dielectric dissipation factors ($\tan \delta
Coupled with modern optical Merging Units (MU) to convert analog intermediate secondary signals into digitized Sampled Measured Values (SMV), enabling fiber-optic substation LAN interoperability and centralized digital protection.
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.
With cutting-edge manufacturing facilities, computerized core winding technology, and rigorous quality inspection protocols, XINSANHUAN continues to provide robust power solutions tailored for severe climates, industrial loads, and modern power utility demands.
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.
Empowering world-class grid reliability through strict quality control, research, and advanced testing.
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. All equipment is subjected to thorough routine, type, and special testing—including lightning impulse withstand, partial discharge measurement (
Globally compliant management systems and certified product quality ensuring seamless market access.
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.
Pioneering the transition toward eco-friendly insulation, intelligent sensor fusion, and digital twins.
Embedded online dielectric loss monitoring, micro-water sensing, and automated capacitance drift analysis enable predictive maintenance and integration with Substation Asset Management Systems.
Adoption of synthetic and natural ester dielectric liquids, solid epoxy cast resin formulations, and SF6 gas alternatives to substantially reduce greenhouse gas impacts and carbon footprints.
Integration of low-power electronic voltage transformers (LPVT) with traditional capacitive divider stacks, delivering dual broadband harmonic measurement up to the 50th harmonic order.
Browse our complete catalog of certified power, distribution, earthing, and specialized substations equipment.
