Dual-Purpose Solution for Power Systems

The LQHVF 250kV/100pF capacitor combines precision voltage measurement and power line coupling in a single oil-immersed unit. Engineered for 60Hz power systems, this innovative solution delivers:

• High-accuracy voltage division (1000:1 ratio, ≤1% error)

• Ultra-clean signal coupling (<5pC PD at 250kV)

• 60-minute continuous operation at full rating

• Modular design for rapid field deployment

Dual-Function Advantage

Eliminates the need for separate measurement and coupling devices - reducing substation footprint by 40% while maintaining laboratory-grade accuracy per IEC 60358-1 standards.

Technical Specifications

Dual-Function Capabilities

As Voltage Divider

• Precise measurement of transmission voltages

• Dielectric withstand testing up to 250kV

• Harmonic analysis at 60Hz fundamental

• Protective relay calibration

As Coupling Capacitor

• Power line carrier (PLC) communication

• Protection signaling for distance relays

• Transient fault recording

• SCADA data transmission

Modular Design Features

Oil-Immersed Construction

High-grade mineral oil insulation provides superior dielectric strength and thermal stability.

Removable Corona Rings

Aluminum alloy rings detach for compact transport and reassemble in minutes.

Interchangeable Arm System

Standardized HV/LV arm connections enable flexible configurations.

Stabilized Removable Base

Engineered pedestal with forklift channels for site mobility.

Industry Applications

Substation Monitoring

Simultaneously measures bus voltage while transmitting data via PLC for integrated grid monitoring.

Transmission Line Protection

Enables directional comparison protection schemes with accurate voltage reference and communication channel.

Operational Advantages

• Space Optimization: Single device replaces two traditional units

• Enhanced Accuracy: ≤1% voltage ratio error ensures reliable protection triggering

• Signal Integrity:

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• Extended Operation: 60-minute rating for commissioning tests

"The dual-function design reduced our substation CAPEX by 30% while improving protection scheme accuracy - a paradigm shift in HV engineering."
               - Senior Protection Engineer, Transmission Utility

Installation Protocol

1. Site Preparation: Level concrete pad with 3m clearance

2. Assembly: Secure corona rings to HV arm

3. Grounding: Connect dual 35mm² cables to station grid

4. Configuration:

• Voltage measurement: Connect to test set

• Coupling function: Terminate to PLC transmitter

5. Safety: Maintain 5m clearance during 250kV operation

Compliance & Standards

Certified to global electrical standards:

• IEC 60358-1: Coupling capacitors & capacitor dividers

• IEEE C57.13: Requirements for instrument transformers

• IEC 60270: Partial discharge measurements

• ANSI C93.1: Power line carrier coupling

KEMA-certified for dual-function performance at 250kV/60Hz.