Engineered for precision across diverse frequency ranges, the LQHVF 700kV/1150pF system combines voltage measurement and coupling functions in a single, field-configurable unit. Designed for resonant testing, power quality analysis, and grid communication, this wideband solution operates from 25-300Hz with laboratory-grade accuracy and robust thermal management.

Technical Specifications

Electrical Parameters

• Rated Voltage: 700kV AC

• Capacitance: 1150pF ±4%

• Frequency Range: 25-300Hz

• Dividing Ratio: 2000:1 nominal

Performance Metrics

• Voltage Ratio Error: ≤±1% (RMS)

• Accuracy: ≤±1.5% full scale

• Dielectric Loss: <0.5%

• Insulation Withstand: 770kV (110%) for 60s

Advanced Engineering Features

Transport-Optimized System

• Quick-release aluminum corona rings

• Modular HV arm disassembly

• Compact shipping configuration

• N2-inerted oil preservation

Thermal & Frequency Management

• ONAN cooling with ±3°C stability

• Wideband capacitance linearity (25-300Hz)

• Low-inductance internal design (≤10nH)

Versatile Measurement System

Connection System

• Corona-free HV terminals (RIV <25dB)

• Variable frequency source integration

• Scalable connectors for GIS/transformer interfaces

• Low-noise measuring leads (shielded triple-core)

Stability & Safety Systems

Pedestal Design

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

• Ground-level measurement terminals

• Anti-tip locking mechanism

Dielectric Protection

• Zero discharge at 770kV withstand test

• Automatic PD cutoff at >5pC

• Oil quality monitoring sensors

Certifications & Industry Applications

International Standards

• IEC 60060-1: High-voltage testing

• IEC 60270: Partial discharge

• IEEE 4: Measurement techniques

• IEC 60358: Coupling capacitors

Critical Applications

• Resonant test systems for cables

• Power factor correction monitoring

• HVDC filter bank diagnostics

• Substation PLC communication

Operational Guidelines

1. Pre-test frequency sweep calibration (25-300Hz)

2. Dual-grounding verification (IEC 61936)

3. ONAN cooling activation 30 minutes pre-energization

4. Real-time dielectric loss monitoring

Safety Notice: Requires Class E4 PPE per IEC 61482 for all operations. Minimum clearance: 6 meters.