Engineered for precision across diverse testing scenarios, the LQHVF 700kV/2500pF system combines dual-ratio voltage measurement and coupling functions in a single, field-configurable unit. Designed for resonant testing facilities, power grid monitoring, and HV laboratory applications, this wideband solution operates from 20-300Hz with laboratory-grade accuracy and robust thermal management.

Technical Specifications

Electrical Parameters

• Rated Voltage: 700kV AC

• System Capacitance: 2500pF ±5%

• Stage Configuration: 2×350kV (5000pF per stage)

• Frequency Range: 20-300Hz

Performance Metrics

• Dividing Ratios: 1000:1 & 2000:1 selectable

• Accuracy: ≤±1% full scale

• Dielectric Loss: <0.3%

• Partial Discharge: ≤5pC at 700kV

• Insulation Withstand: 770kV (110%) for 1min

Advanced Engineering Design

Modular Transport System

• Quick-release aluminum corona rings

• Stage-separable construction (2×350kV units)

• Compact shipping dimensions

• N2-inerted oil preservation (O₂ <0.5%)

Thermal & Frequency Performance

• ONAN cooling with ±2°C stability

• Wideband capacitance stability (±2% 20-300Hz)

• Low-inductance design (≤8nH)

Versatile Measurement System

Connection System

• Corona-free HV terminals (RIV <28dB)

• Variable frequency source integration (20-300Hz)

• Scalable connectors for GIS/bushing interfaces

• Triple-shielded measuring leads

Stability & Safety Systems

Pedestal Design

• Removable seismic-rated base (IEC 60068-3 Class 2)

• Ground-level measurement terminals

• Interlocking stability feet

Dielectric Protection

• Zero discharge at 770kV withstand test

• Automatic PD cutoff at >5pC

• Real-time oil quality monitoring

Certifications & Industry Applications

International Standards

• IEC 60060-1: High-voltage testing

• IEC 60270: Partial discharge measurement

• IEEE 4: Measurement techniques

• IEC 60358: Coupling capacitors

Critical Applications

• Resonant test systems for transformers

• EHV cable partial discharge mapping

• HVDC converter station diagnostics

• Substation PLC communication

Operational Guidelines

1. Pre-test frequency calibration (20-300Hz sweep)

2. Dual-grounding verification (IEC 61936)

3. Cooling system activation 30 minutes pre-energization

4. Continuous dielectric loss monitoring

5. Annual recertification per IEC 60480

Safety Notice: Requires Class E4 PPE per IEC 61482. Minimum clearance: 6.5 meters for 700kV operations.