Industrial-Grade HV Instrument for Critical Systems

Engineered for 20kV applications, this dual-function device combines a 1000:1 voltage divider with PD coupling capabilities. The 500pF capacitance delivers:

• Accurate RMS voltage measurement with ≤±1% accuracy

• High-sensitivity partial discharge detection

• Harmonic analysis up to 20kHz bandwidth

• Dielectric loss monitoring in transformers and cables

Technical Specifications

Thermal-Managed Operation Cycle

Operation Phase

Duration: 60 minutes

Conditions: 100% rated voltage

Max ΔT: 65K (winding)

Cooling Phase

Duration: 60 minutes

Cooling: Natural convection

Max ΔT: 55K (winding-oil)

Daily Capacity

Cycles: 4 full operations

Total Runtime: 4 hours

Designed for 8-hour shifts

Thermal Advantage: Oil-immersed design maintains safe operating temperatures during intensive testing schedules.

Modular Structural Design

Top Corona Cover

Aluminum alloy

Prevents surface discharge

HV Arm

Removable connection

20kV rated

L Arm

Measurement interface

BNC output

Stabilized Base

Non-slip design

Leveling feet

• Oil-Immersed Construction: Mineral oil enhances heat dissipation and arc suppression

• Quick-Disconnect: Field assembly in under 10 minutes

• Corona-Free Design: Optimized geometry prevents RF interference

PD Measurement Capability

Compliance: Meets IEC 60270 Partial Discharge Standards

Coupling Configuration:

1. Connect HV terminal to test object

2. Route L-arm output to PD analyzer

3. Ground base to earth reference

4. Use 50Ω coaxial cable ≤2m length

Detection Advantage: 500pF capacitance provides optimal impedance for PD signal coupling in 20kV systems.

Compliance & Applications

Standards Compliance:

• IEC 60270:2000 (Partial Discharge Measurements)

• IEEE 4-2013 (High-Voltage Testing)

• EN 60076-11 (Dry-Type Transformers)

Critical Applications:

1. Factory acceptance testing of 20kV switchgear

2. On-line PD monitoring in industrial facilities

3. Dielectric loss measurement in power transformers

4. High-voltage research laboratories

Operational Protocol

1. Assembly: Connect modules in sequence (base → L-arm → HV arm → corona cover)

2. Grounding: Establish earth connection with ≥10mm² cable

3. Cooling Check: Verify oil level before energization

4. Operation Cycle:

• Max 60 minutes continuous at 20kV

• Follow with 60-minute cooling period

• Max 4 cycles per 8-hour shift

5. PD Measurement: Use shielded coaxial cable directly to analyzer

Safety Feature: Automatic discharge circuit activates when voltage drops below 50V