Advanced Dual-Unit Design for Critical Measurements

The LQHVF 250kV/10000pF redefines high-voltage measurement accuracy with its innovative series-connected dual-capacitor design. Engineered for extended transformer testing applications, this solution features:

• Two 20,000pF units in series for 10,000pF equivalent capacitance

• Industry-leading partial discharge: ≤2pC @250kV

• Ultra-low dielectric loss (

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• 275kV/1min insulation withstand (110% rated voltage)

Synchronized Transformer Testing

Operates continuously "same with the transformer" - enabling extended temperature-rise and load tests with ≤±1% accuracy throughout the test cycle.

Technical Specifications

Flexible Configuration Options

Single-Stage Configuration

Voltage: 250kV
                   Application: Standard transformer tests
                   Setup: Single-unit deployment

Series Configuration

Voltage: 500kV
                   Application: EHV transformer testing
                   Setup: Two units in series

Seamless Switching

Proprietary HV corona-free connectors enable reconfiguration between modes in under 15 minutes without specialized tools.

Innovative Design Features

Dual ONAN Cooling System

Independent oil circulation in each unit maintains thermal stability during extended transformer tests.

Removable Corona Rings

Aerospace-grade aluminum alloy rings detach for compact transport and reassemble in minutes.

Stabilized Removable Base

Engineered pedestal with seismic restraints and forklift channels.

Synchronized Measurement

Phase-matched units maintain 2000:1 ratio within 0.05% variance across temperature range.

Transformer Testing Applications

Temperature Rise Testing

Continuous operation synchronized with transformer under load for 8+ hours with ≤±1% accuracy drift.

Impulse Withstand Verification

275kV/1min insulation withstand testing per IEC 60076-3 with PD monitoring ≤2pC.

Extended Duration Tests

72-hour induced voltage tests with continuous tanδ measurement at<0.2%.<>

Operational Advantages

• Extended Operation: Unlimited runtime when synchronized with transformer

• Ultra-Low PD: ≤2pC enables sensitive measurements during partial discharge tests

• Thermal Stability: ≤0.1% ratio drift during temperature transitions

• Scalable Voltage: 250kV single-stage or 500kV series configuration

"The dual-unit design maintained ±0.8% accuracy throughout our 18-hour temperature rise test - eliminating measurement uncertainty in transformer certification."
               - Chief Test Engineer, Power Transformer Manufacturer

Installation & Operation Protocol

1. Configuration Selection: Choose single-stage (250kV) or series (500kV)

2. Assembly: Secure corona rings using alignment markers

3. Grounding: Connect dual ground cables per unit

4. Measurement: Use shielded leads to VF power source

5. Synchronization: Connect monitoring to transformer test controller

6. Safety: Maintain 5m clearance during 275kV tests

7. Duration: No time limit when synchronized with transformer

Compliance & Standards

Certified to international transformer testing standards:

• IEC 60076-1/2/3: Power transformers

• IEEE C57.12.90: Standard test code for transformers

• IEC 60270: Partial discharge measurements

• IEC 60060-1: High-voltage test techniques

KEMA-certified for extended duration operation at 250kV.