Precision Dual-Function Instrument for Critical HV Systems

The LQHVF 250kV/200pF sets new standards in high-voltage measurement with unprecedented partial discharge performance (<2pC @250kV). This dual-function instrument combines precision voltage division and power line coupling capabilities in a single oil-immersed package, delivering:

• Laboratory-grade accuracy (≤1%) in field conditions

• Ultra-clean signal coupling for protection relays

• 60-minute continuous operation at full rated voltage

• Modular design for rapid deployment

Breakthrough PD Performance

With PD levels below 2pC at 250kV - 60% lower than industry standards - enabling sensitive measurements in noisy substation environments per IEC 60270 Class II requirements.

Technical Specifications

Patented Modular Design

Oil-Immersed Capacitors

High-purity mineral oil provides superior dielectric strength and thermal conductivity at 250kV.

Quick-Disconnect Corona Rings

Tool-free aluminum alloy rings eliminate corona above 150kV, detachable in<90 seconds.="">

Interchangeable Arm System

Standardized HV/LV arm connections enable reconfiguration for different voltage classes.

Portable Base

Removable pedestal with forklift channels and seismic restraints for field deployment.

Dual-Function Applications

As Precision Voltage Divider

1000:1 ratio with ≤1% error for:

• Calibration of 220kV+ protection relays

• Dielectric response testing of transformers

• Harmonic analysis at 50Hz fundamental frequency

As Coupling Capacitor

200pF capacitance optimized for:

• Power line carrier (PLC) communication

• Directional comparison protection signaling

• Transient fault recording

Operational Advantages

• Zero PD Interference:

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• 60-Minute Thermal Stability: ONAN cooling maintains ±0.1% accuracy during extended tests

• Test-Ready Design: Pre-installed PD monitoring terminals

• Rapid Deployment: Field assembly in

  <30 minutes="">

The lt 2pC PD performance allows us to detect incipient insulation faults previously masked by measurement noise - a game-changer for predictive maintenance.
               - Chief Engineer, High-Voltage Laboratory

Installation & Safety Protocol

1. Site Preparation: Level concrete pad (min. 2m x 2m)

2. Grounding: Dual 35mm² copper cables to station grid

3. Corona Ring Assembly: Hand-tighten until alignment marks match

4. Pre-Energization Check: Verify oil level in sight glass

5. Operational Limit: Max 60 continuous minutes at 250kV

6. Decommissioning: 30-minute discharge cycle before disassembly

Compliance & Certifications

Third-party verified to international standards:

• IEC 60358-1: Coupling capacitors and capacitor dividers

• IEC 60270: Partial discharge measurements

• IEEE C57.13: Requirements for instrument transformers

• EN 60076: Power transformers

KEMA-certified test reports available for all production units.