Metrological Specifications

Precision Characteristics

Electrical Performance

• Dielectric Loss: ≤0.2% @20±0.5°C

• Measurement Accuracy: ≤±1%

• Phase Defect: ≤0.005°

Operational Limits

• Duty Cycle: 1 hour ON / 1 hour OFF

• Recovery Time: 3 hours after 792kV test

• Environment: 20±2°C, <50% RH

Mechanical Construction

• Insulation System:

• Ultra-low-loss epoxy-oilpaper composite

• 10-layer capacitive grading

• 120mm nominal wall thickness

• Corona Control:

• Ø1500mm multi-stage corona ring

• Surface gradient ≤8 kV/cm @720kV

• Mobility System:

• Motorized hydraulic leveling (±0.1° accuracy)

• Active vibration cancellation

• Rail-guided transport system

Installation Protocol

1. Facility Requirements:

• 12m minimum clearance to ground

• Class 10000 cleanroom environment

• ±0.2° leveling mandatory

2. Measurement Setup:

• Use 100kV-rated quadruple-shielded cable

• Triple-guard shield connection

3. Energization Procedure:

• 50kV steps (10min/step)

• PD monitoring at each step

• Baseline tanδ @360kV

Calibration & Maintenance