Metrological Specifications

Precision Characteristics

Electrical Performance

• Dielectric Loss: ≤0.2% @20±1°C

• Measurement Accuracy: ≤±1%

• Phase Defect: ≤0.008°

Operational Limits

• Duty Cycle: 1 hour ON / 1 hour OFF

• Cooling Method: ONAN

• Environment: Indoor (20±5°C)

Mechanical Construction

• Insulation System:

• Ultra-clean epoxy-oilpaper composite

• 8-layer capacitive grading

• 70mm nominal wall thickness

• Corona Control:

• Ø1000mm quadruple-ring electrode

• Surface field ≤12 kV/cm

• Mobility System:

• Motorized leveling base (±0.25° accuracy)

• Air-cushion transport system

• Vibration isolation pads

Installation Protocol

1. Facility Requirements:

• 8m minimum clearance to ground

• Controlled environment lab

• ±0.5° leveling mandatory

2. Measurement Setup:

• Use 75kV-rated triaxial measurement cable

• Double-guard shield connection

3. Pre-Test Verification:

• Step energization (50kV steps, 5min/step)

• Baseline PD measurement @200kV

Calibration & Maintenance