Dual-Function Precision Instrument

The LQHVF series serves as both a high-accuracy voltage divider and signal coupling capacitor, engineered for 10kV power systems. With 100:1 ratio and ≤1% accuracy, it enables:

• Partial discharge (PD) monitoring in transformers and switchgear

• Harmonic analysis in modern power grids

• Calibration of protection relays per IEC 60255

• Dielectric loss tangent measurements

Technical Specifications

Innovative Structural Design

Patented Modular Architecture: Enables field maintenance without oil replacement

• Oil-Immersed Construction: Mineral oil insulation enhances thermal dissipation and arc resistance

• Removable Corona Rings: Optimized geometry reduces surface gradients

• Tri-Component System: L-arm, HV arm, and base allow component-level servicing

• Compact Dimensions: 65mm × 90mm × 420mm (fits confined substation spaces)

Critical Applications

Industry Insight: 300pF capacitance provides optimal balance for PD detection and power frequency measurement

1. Partial Discharge Monitoring: Detect insulation weaknesses in cables and GIS

2. Power Quality Analysis: Measure harmonics up to 5kHz bandwidth

3. Protective Relay Testing: Generate precise reference signals

4. Research & Development: Characterize dielectric materials under HV stress

Compliance & Safety

Engineered to global standards for HV equipment:

• IEC 61869-11:2023 (Instrument Transformers)

• IEEE C57.13-2016 (Accuracy Classes)

• EN 50191 (Installation Requirements)

• CAT IV 600V safety rating

Safety Feature: Integrated pressure-relief diaphragm prevents oil leakage during faults.

Operational Protocol

1. Pre-Use Check: Verify oil level in sight glass before energization

2. Grounding: Connect base to earth ground with ≥6mm² cable

3. Cooling: Maintain 0.5m clearance for air circulation

4. Calibration: Perform biannual dielectric loss tests per IEEE 4-2013