Engineered for precision in ultra-high-voltage systems, the LQHVF 720kV/2500pF dual-ratio capacitor delivers unmatched flexibility in measurement applications. Featuring switchable 2000:1 and 3600:1 outputs, this two-stage solution enables laboratory-grade accuracy in substation monitoring, transformer testing, and grid diagnostics at 50Hz operations.

Technical Specifications

Electrical Parameters

• Rated Voltage: 720kV AC (2×360kV stages)

• System Capacitance: 2500pF ±4%

• Stage Capacitance: 5000pF per stage

• Frequency: 50Hz

Performance Metrics

• Dividing Ratios: 2000:1 & 3600:1 selectable

• Accuracy: ≤±1% full scale

• Dielectric Loss: <0.3%

• Partial Discharge: ≤10pC at 720kV

• Insulation Withstand: 792kV (110%) for 1min

Advanced Engineering Features

Dual-Ratio Measurement System

• 2000:1 for standard voltage measurement

• 3600:1 for high-sensitivity applications

• Field-switchable without recalibration

Thermal & Dielectric Management

• ONAN cooling (Oil Natural Air Natural)

• Temperature stability: ±2°C at full load

• N2-inerted oil preservation system

Precision Measurement Capabilities

Partial Discharge Performance

• ≤10pC at 720kV (system verified)

• Ultra-low noise measurement circuits

• IEC 60270 compliant detection

Safety & Reliability Systems

Insulation Verification

• 792kV withstand for 60 seconds

• Zero discharge during test protocol

• Automatic PD cutoff at >10pC

Structural Integrity

• Dual-stage seismic reinforcement

• Corona-free HV connections

• Removable transport components

Certifications & Industry Applications

International Standards

• IEC 60060-1: High-voltage test techniques

• IEC 60270: Partial discharge measurements

• IEEE 4: Measurement standards

• IEC 60358: Coupling capacitors

Critical Applications

• EHV transformer ratio verification

• Switchgear partial discharge mapping

• HVDC converter station monitoring

• Substation PLC communication

Operational Guidelines

1. Pre-test ratio selection calibration

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 720kV operations.