Ultra-Precise HV Instrument for Demanding Applications

Engineered for 30kV power systems, the LQHVF combines laboratory-grade accuracy with field-deployable reliability. The optimized 300pF capacitance delivers:

• Ultra-sensitive partial discharge detection (<3pC)

• Precise voltage measurement with ≤±1% accuracy

• Extended frequency response (DC to 100kHz)

• Dielectric loss monitoring in transformers and cables

Technical Specifications

Innovative Modular Design

Corona Rings

Aluminum alloy

Removable design

HV Arm

30kV rated

Quick-disconnect

V Arm

Measurement interface

BNC output

Removable Base

Stabilized platform

Leveling feet

Oil-Immersed Construction

High-grade mineral oil enhances thermal management and arc suppression

Dielectric Strength: 45kV/mm

Quick-Disconnect System

Field assembly in under 8 minutes without special tools

Maintenance Advantage: Component-level servicing

Corona-Free Design

Optimized geometry prevents RF interference above 20kV

Measurement Integrity: Stable readings

Dual-Function Capabilities

Technical Advantage: The V-arm design provides 25% better phase accuracy than conventional L-arms for power factor measurements

Operational Modes:

Voltage Division Mode

Connection: V-arm to voltmeter

Output: 30V at 30kV input (1000:1)

Accuracy: ≤±1% from 10Hz to 10kHz

PD Coupling Mode

Connection: HV terminal to PD analyzer

Sensitivity: <3pC detection

Bandwidth: 20Hz-100kHz

Thermal Management System

• ONAN Cooling: Oil Natural Air Natural convection maintains safe operating temperatures

• Thermal Performance: <40°C rise during 60-min full-load operation

• Cooling Requirements: Maintain 25cm clearance around unit

• Operating Cycle: 60 minutes at 30kV followed by 60-minute cooling period

Compliance & Applications

Standards Compliance: IEC 60270:2000, IEEE 4-2013, EN 61869-11:2023

Critical Applications:

• Partial discharge monitoring in 30kV switchgear and GIS

• Factory acceptance testing of high-voltage transformers

• Power quality analysis in industrial facilities

• Dielectric response testing of insulation materials

• Calibration of protective relays and metering systems

Operational Protocol

1. Assembly: Connect components (base → V-arm → HV-arm → corona rings)

2. Grounding: Establish earth connection with ≥12mm² cable

3. Cooling Check: Verify oil level via sight glass

4. Energization: Ramp voltage gradually to operational level

5. Operation:

• Max 60 minutes continuous at 30kV

• Follow with 60-minute cooling period

6. PD Measurement: Use 50Ω coaxial cable ≤1.5m to analyzer

Safety Feature: Integrated discharge resistors (800kΩ) automatically de-energize within 2 minutes

Why This Instrument Stands Out

Unmatched PD Sensitivity

<3pC detection at 30kV for early fault detection

Modular Flexibility

Removable components for easy maintenance and transport

Thermal Resilience

ONAN cooling ensures stable performance under load

Measurement Versatility

V-arm design optimizes both voltage division and PD coupling