Engineered for precision in extra-high-voltage systems, the LQHVF 700kV/1000pF unit combines coupling and measurement functions in a single, field-configurable system. Designed for power transmission monitoring, substation communication, and HV laboratory testing, this dual-ratio solution delivers exceptional accuracy at 50Hz operations with 60-minute continuous rating.

Technical Specifications

Electrical Parameters

• Rated Voltage: 700kV AC

• Capacitance: 1000pF ±3%

• Frequency: 50Hz (60Hz optional)

• Dividing Ratio: 1000:1 or 2000:1 selectable

Performance Metrics

• Accuracy: ≤±1% full scale

• Dielectric Loss: <0.2%

• Partial Discharge: ≤5pC at 700kV

• Continuous Operation: 60 min at 100% rating

Modular Field Design

Transport-Optimized Components

• Quick-release aluminum corona rings

• Sealed oil-immersed insulation system

• N2-inerted tank (oxygen <0.5%)

Thermal Management

• ONAN cooling (Oil Natural Air Natural)

• Temperature stability: ±3°C at full load

• Real-time oil dielectric monitoring

Advanced Measurement System

Connection System

• Corona-free HV terminals (RIV <30dB)

• Low-inductance measuring leads (≤3nH/m)

• Variable frequency source compatibility

• Scalable connectors for transformer/GIS interfaces

Rigorous Safety Standards

Insulation Verification

• 770kV (110% rated) withstand for 1 minute

• Zero abnormal discharge at test voltage

• Annual dielectric strength validation

Stability Features

• Removable seismic-rated pedestal

• Anti-vibration locking mechanism

• Ground-level measurement terminals

Certifications & Industry Applications

International Standards

• IEC 60358: Coupling capacitors

• IEC 60060-1: HV test techniques

• IEEE 4: Measurement standards

Critical Applications

• EHV transmission line monitoring

• Power line carrier communication

• Transformer impulse testing

• Substation SCADA integration

Operational Guidelines

1. Pre-test insulation resistance verification (>10GΩ)

2. Grounding confirmation (dual-point)

3. Cooling system activation before energization

4. Continuous PD monitoring during operation

Safety Notice: Requires Class E4 PPE per IEC 61482 for all operations. Minimum clearance: 7 meters.