Outdoor Rated 0.2 Class Dry Measurement Potential Transformer For Voltage Measurement

The JDZW-35R is a high-performance, outdoor-rated Potential Transformer (PT) designed for voltage measurement and relay protection in 35kV (up to 40.5kV) power systems. Unlike traditional oil-filled units, the JDZW-35R utilizes a fully encapsulated dry-type design, featuring high-grade epoxy resin casting that provides superior insulation and weather resistance.

This unit is specifically engineered for high-precision utility metering (0.2 Class) and as a reliable power supply for high-voltage circuit breaker operating mechanisms. Its rugged "R" series construction ensures stable performance in high-pollution environments, making it the preferred choice for 35kV substations and outdoor power distribution networks.

• High-Precision Metering (Class 0.2/0.5): Engineered to provide extreme accuracy for revenue metering and grid monitoring, ensuring precise data for utility billing and system analysis.

• Maintenance-Free Dry-Type Design: The vacuum-cast epoxy resin eliminates the risk of oil leakage and fire, significantly reducing O&M costs and environmental impact.

• Anti-Pollution & UV Resistant: The outer shell features a large creepage distance "umbrella" skirt design, providing exceptional resistance to surface tracking, UV degradation, and salt-spray corrosion.

• Robust Dielectric Strength: Rated for a power frequency withstand voltage of 95kV and a lightning impulse withstand of 200kV, ensuring safety during grid surges.

• Integrated Fuse Protection (Optional): Available with a built-in primary fuse to protect the transformer and the rest of the grid from internal faults.

1. Grid Revenue Metering: Providing high-accuracy voltage signals for commercial utility billing at 35kV connection points.

2. Outdoor Substations: Voltage sensing for protective relaying (Over/Under voltage) in 33kV and 35kV transmission networks.

3. Circuit Breaker Power Supply: Serving as a reliable power source for the operating motors and control units of high-voltage outdoor breakers.

4. Renewable Energy Hubs: Voltage monitoring for the medium-voltage side of wind and solar farm collection substations.

• Total Environmental Endurance: Our epoxy resin formula is specifically modified for thermal stability, preventing cracking during extreme temperature swings from -25°C to +50°C.

• Compact Footprint: The dry-type architecture allows for a significantly lighter and smaller unit than oil-immersed PTs, simplifying installation on poles or steel structures.

• Silver-Plated Terminals: All secondary terminals are silver-plated to ensure low contact resistance and prevent oxidation over decades of outdoor exposure.

• Rigorous Factory Routine Testing: Every unit undergoes a partial discharge test (kept below 10pC) and an accuracy verification test across the full range of rated burden before shipment.

Q: Can this PT be used as a Power Transformer for small loads?

A: While primarily for measurement, it can provide a small amount of auxiliary power (VA) for protection devices or breaker motors. However, for higher power loads, a dedicated Station Service Transformer (SSVT) is recommended.

Q: What is the benefit of "Class 0.2" over "Class 0.5"?

A: Class 0.2 means a maximum error of 0.2% in voltage measurement. This is typically required for "Revenue Grade" metering where financial transactions occur based on the readings.

Q: Is the unit resistant to "Ferroresonance"?

A: Our JDZW-35R is designed with high-quality silicon steel cores that offer excellent saturation characteristics, helping to mitigate the risk of ferroresonance in the grid.