Precision Instrument for Power Transmission Systems

The LQHVF 250kV/400pF serves dual roles as a capacitor voltage divider and coupling capacitor, engineered for critical high-voltage applications in transmission and substation environments. With exceptional accuracy (<1%) and="" ultra-low="" partial="" discharge="">

• Accurate voltage measurement in test labs and field installations

• Secure signal coupling for power line carrier (PLC) communication

• Partial discharge monitoring during insulation tests

• Harmonic analysis at 50Hz fundamental frequency

Certified Performance

Meets IEC 60358-1 standards for coupling capacitors with ONAN cooling for thermal stability during 60-minute continuous operations at rated voltage.

Technical Specifications

Innovative Modular Design

Oil-Immersed Capacitors

Mineral oil insulation provides superior dielectric strength and thermal stability at 250kV.

Removable Corona Rings

Aluminum alloy rings for discharge suppression, detachable for compact transport.

Modular Arm Assembly

Separate LV and HV arms with standardized interfaces for flexible configurations.

Stabilized Base

Removable pedestal with anti-vibration mounting for field deployment.

Dual-Function Applications

As Voltage Divider

Precision measurement of transmission voltages with 1000:1 ratio and<1% error="" for:="">

• Dielectric withstand testing

• Power quality monitoring

• Protective relay calibration

As Coupling Capacitor

Signal injection/extraction for power line communication systems:

• SCADA data transmission

• Protection signaling

• Frequency-shift keying (FSK) communications

Operational Excellence

• 60-Minute Continuous Rating: Full-power operation for extended test sequences

• ONAN Cooling: Natural convection eliminates fan maintenance

• Corona-Free Operation: Integrated corona rings prevent RF interference

• Test Points: Built-in terminals for PD monitoring during operation

"The dual-function capability reduces substation footprint by 30% while providing laboratory-grade measurement accuracy - a breakthrough for compact switchyards."
               - Senior Engineer, Transmission Utility

Installation & Safety Protocol

1. Foundation: Install on level concrete pad (min. 3m² area)

2. Grounding: Connect dual ground cables to base terminals

3. Clearance: Maintain 5m minimum clearance to structures

4. Pre-Test: Verify PD levels at 175kV (70% Un) before full operation

5. Cooling: Ensure unobstructed airflow around tank surfaces

Compliance & Standards

Manufactured to global electrical standards:

IEC 60358-1                IEC 60044-7                IEC 60270                IEEE C57.13                ANSI C93.1

Third-party certified for partial discharge performance at KEMA and STL laboratories.