Metrological Specifications

Precision Characteristics

Electrical Performance

• Dielectric Loss: ≤0.2% @20±1°C

• Temp Coefficient: <15 ppm/°C

• Phase Defect: ≤0.01°

Operational Limits

• Duty Cycle: 1 hour ON / 1 hour OFF

• Daily Cycles: 3 maximum

• Recovery Time: 2 hours after 275kV test

Mechanical Construction

• Insulation System:

• Ultra-low loss epoxy-oilpaper composite

• 7-layer capacitive grading

• 60mm nominal wall thickness

• Corona Control:

• Ø800mm triple-ring electrode

• PD <0.5pC @250kV

• Mobility System:

• 6-point hydraulic leveling base

• Air-ride transport suspension

• Vibration isolation mounts

Installation Protocol

1. Site Preparation:

• 6m minimum clearance to ground

• ±0.5° leveling requirement

• Controlled environment (20±2°C)

2. Measurement Setup:

• Use supplied 60kV-rated triaxial cable

• Guard ring connection mandatory

3. Pre-Test Conditioning:

• 60kV step-up procedure (5min/step)

• Baseline tanδ measurement @100kV

Calibration & Maintenance