Ultra-Stable Solution for Critical Power Systems

The LQHVF 300kV/1000pF sets new standards in high-voltage stability with its exceptional 5×10⁻⁵ %/°C temperature coefficient and dual-function capability. Engineered for precision measurement and communication in demanding environments, this solution delivers:

• Industry-leading temperature stability (5 ppm/°C)

• Ultra-low partial discharge: <5pC @300kV, <3pC @240kV

• Laboratory-grade accuracy (≤±1%)

• 330kV insulation withstand (110% rated voltage)

Breakthrough Thermal Performance

Maintains ≤0.1% ratio drift across -40°C to +85°C range - critical for outdoor substations and extreme environments.

Technical Specifications

Partial Discharge Performance

300kV (100% Un)

<5pC

Tested per IEC 60270

240kV (80% Un)

<3pC

With transformer load

Precision Design Features

Oil-Immersed Stability

High-grade mineral oil provides consistent dielectric properties across temperature variations.

Temperature-Optimized Materials

Special dielectric formulation achieves 5×10⁻⁵ %/°C thermal coefficient.

Removable Corona Rings

Aerospace aluminum alloy rings prevent discharge at 300kV+.

Modular Arm System

Separable LV/HV arms with standardized interfaces for maintenance.

Dual-Function Operation

As Precision Voltage Divider

1000:1 ratio with ≤±1% error for:

               - Protective relay calibration

               - Harmonic distortion measurement

               - Transient overvoltage recording

As Coupling Capacitor

1000pF capacitance optimized for:

               - Secure protection signaling

               - Power line carrier communication

               - SCADA data transmission

Thermal Stability Verification

Rigorous Temperature Testing

Each unit undergoes thermal cycling with performance validation at:

1. -40°C (Arctic conditions)

2. +25°C (Standard lab)

3. +85°C (Desert environment)

Certified ratio variation <0.1% across full operational range.

Operational Advantages

• Extreme Environment Ready: -40°C to +85°C operation

• Ultra-Low PD: <3pC at 240kV ensures noise-free operation

• Measurement Precision: ≤±1% accuracy at 60Hz

• Safety Assurance: 330kV/1min insulation withstand

"The temperature stability eliminated seasonal recalibration - we maintain ≤±1.1% accuracy year-round in our mountain substation (-30°C to +40°C)."
               - Chief Engineer, High-Altitude Substation

Installation & Safety Protocol

1. Site Preparation: Level surface with 5m clearance

2. Assembly: Secure corona rings using thermal alignment markers

3. Grounding: Dual 35mm² cables to independent ground grid

4. Pre-Test:

• Verify dielectric loss <0.2% at ambient temperature

• Perform 240kV PD test (<3pC verification)

5. Operation:

• 300kV: Max 60 minutes continuous

• Monitor base stability during thermal transitions

Compliance & Standards

Certified to international standards:

• IEC 60358-1: Coupling capacitors & capacitor dividers

• IEEE C57.13: Instrument transformer requirements

• IEC 60068-2: Environmental testing

• IEC 60270: Partial discharge measurements

• MIL-STD-810: Environmental engineering considerations

Includes NIST-traceable temperature stability certification.