High-Precision Oil-Impregnated Current Transformers (25–170kV )

Property Specification

Type: High-Precision Oil-Impregnated Top-Core Current Transformer (25 kV to 170 kV)

Features: Purpose-built for bi-directional energy measurement across broad dynamic current spans, this unit features a top-core, oil-immersed arrangement with shield-graded insulation engineered specifically for outdoor switchyards. A top-mounted hermetic gas cushion seals the interior to completely prevent ambient moisture ingress. It delivers exceptional accuracy stability across an ultra-wide current operating envelope  alongside field-proven reliability that significantly outperforms standard industry failure averages.

Applications: Bi-directional power exchange revenue metering for independent power generation assets, tie-point revenue or allocation measurement across zero-crossing current conditions, and high-accuracy billing applications for major critical industrial loads.

Description

Key Technical Performance Specifications

Technical Parameter / Specification Specification Rating / Capability
Deployment / Environment Outdoor
Structural Architecture / Construction Head (Top Core) Configuration
Dielectric Insulation Medium Oil-Impregnated Paper
Rated Maximum System Voltage 25 – 170 kV
Maximum Primary Current Capacity Up to 3400 A (up to 170 kV)
Short-Circuit Thermal Current Rating Up to 120 kA / 1 s
External Insulator Material Porcelain (Standard) / Silicone Rubber (Upon Request)
Specific Creepage Clearance ≥ 25 mm/kV (Extended distances upon request)
Operating Ambient Temperature Limits -40°C to +40°C (Standard)*
Standard Installation Altitude ≤ 1000 m (Standard)*