Electronic Voltage Transformer Solution: The Ideal Choice for Extreme Environments, Long Life, and Minimal Maintenance

​

In demanding application scenarios such as Ultra High Voltage (UHV) power transmission, offshore wind power, and Gas-insulated Switchgear (GIS), reliability, safety, and operational lifespan requirements for voltage measurement equipment are unprecedented. Traditional electromagnetic voltage transformers (VTs) often fall short when faced with extreme temperatures, intense electromagnetic interference, high insulation requirements, and the need for long-term minimal maintenance. The Electronic Voltage Transformer (EVT) solution is born to overcome these challenges, utilizing revolutionary technology to ensure uncompromising power metering, protection, and monitoring for critical infrastructure.

​Challenges & Pain Points:​​

• ​Harsh Temperature Extremes:​​ Severe cold (e.g., high latitudes) and intense heat (e.g., deserts, offshore high temperatures) pose rigorous demands on equipment temperature resilience.
• ​Intense Electromagnetic Interference:​​ Strong EMI in GIS and UHV environments can lead to measurement errors or even device failure.
• ​Explosion & Overheating Hazards:​​ The risk of explosions or overheating in traditional oil/gas-insulated VTs constitutes a safety hazard.
• ​Demanding Insulation:​​ UHV applications require top-tier insulation performance to ensure system stability and personnel safety.
• ​High Maintenance Costs:​​ Equipment maintenance in remote or high-risk areas (e.g., offshore wind farms) is costly, driving the need for long-life, near-zero maintenance designs.
• ​Erosion of Operational Efficiency:​​ Ongoing costs for maintenance and replacement due to equipment aging continuously erode operational benefits.

​The Solution:​​
The EVT fundamentally redefines voltage measurement by replacing traditional iron-core coil structures with solid-state sensing principles such as optical sensing or precision resistive-capacitive voltage division:

• ​Solid-State Sensing Principle (Optical or Resistive-Capacitive):​​ Core sensing elements lack ferromagnetic materials, completely eliminating the risk of magnetic saturation.

​Core Advantages:​​

• ​Inherently Immune to EMI:​​ Provides stable and accurate measurement even in high-interference environments.
• ​Exceptional Insulation Performance:​​ Highly suited for UHV applications.
• ​Intrinsically Safe:​​ Eliminates risks associated with flammable materials or explosive gases.
• ​Ultra-Wide Operating Temperature Range (-40°C to +85°C+):​​ Ensures reliability across extreme climates.
• ​Extended Lifespan (>25 years) & Near-Zero Maintenance:​​ Drastically reduces lifecycle costs.

​Key Application Scenarios:​​

1. ​Gas-insulated Switchgear (GIS):​​ EVT's compact size, light weight, absence of oil/gas, and insulation integrity matching the GIS body itself make it the preferred choice for modern GIS designs with stringent space constraints and paramount safety requirements.
2. ​UHV Transmission (AC/DC):​​ At voltage levels exceeding one million volts, the EVT's superior insulation performance, EMI immunity, and measurement precision are critical pillars for ensuring the safe and economical operation of the power grid.
3. ​Offshore Wind Power:​​ Confronting salt spray corrosion, high-frequency vibration, wide temperature fluctuations, and exorbitant O&M costs, EVT's corrosion-resistant design, wide-temperature operation, minimal maintenance, and extended lifespan perfectly match these severe demands.
4. ​Arctic/High-Altitude Substations / High-Temperature Industrial Environments:​​ Reliable, stable performance across extreme temperatures ensures accurate and dependable operation where traditional equipment fails.