D. Insulation Testing

1. Methods and Procedures ^{2, 3, 4}

Employ methods and procedures for insulation tests and analyze results

Basic Knowledge ²

Advanced Knowledge ^{3, 4}

Essential Reading

• Electrical Power Equipment Maintenance and Testing ^2 3 4
  - Chapter 2: Direct-Current Voltage Testing of Electrical Equipment
  - Chapter 3: Power Factor and Dissipation Factor Testing Methods
• NFPA 70B: Chapter 11.9 Insulation Testing ^2 3 4
• The Complete Guide to Electrical Insulation Testing ³
• A Guide To Diagnostic Insulation Testing Above 1 kV

Insulation Resistance

• What is Insulation Testing?
• The Basics of Insulation Resistance Testing
• Understanding Insulation Resistance Testing
• Understanding Your Insulation Tester: Safety Standards and Testing Alerts
• How Do I Choose the Right Insulation Tester?
• Kilohm Range: What is It?
• How do I select test voltage for an insulation test?
• Fluctuating Insulation Testing Readings: What is the actual measurement?
• Voltage Regulation in Insulation Testing
• Can Multiple-Use Testers be used for Insulation Testing?
• The ‘G’ terminal…and it doesn’t mean ground
• Preparing for Insulation Resistance Tests
• Insulation resistance testing: How and why?
• The Value of Insulation Resistance Testing
• Measuring Field Winding Insulation Resistance
• Insulation Resistance Profile (IRP) for assessing insulation systems

Overpotential / Hipotential Testing

• Should I use a high-pot or a megohmmeter?
• The Basics of HIPOT Testing (Dielectric Strength Test)
• Overpotential test voltage for low-voltage switchgear
• What does a rise in leakage current indicate?

Power-factor/dissipation-factor testing

• The do’s and don’ts of insulation power factor testing – Part 1
• The do’s and don’ts of insulation power factor testing – Part 2
• The do’s and don’ts of insulation power factor testing – Part 3
• The do’s and don’ts of insulation power factor testing – Part 4
• Power Factor Testing Application Guide
• 3 Basic Modes of Power Factor Testing
• The Value of Power Factor Testing
• What is Dissipation Factor?
• High Voltage Bushing Maintenance Explained
• Power Factor Testing of Bushings
• Expanding the Diagnostic Impact of Power Factor Testing - Interpretation of Narrow Band Dielectric Frequency Response
• Diagnostic testing of bushings

2. Partial Discharge ^{3, 4}

Demonstrate understanding of Partial Discharge Testing in accordance with ANSI/NETA standards

Basic Understanding ³

• IEC 60270 Partial Discharge Measurements
• The Basics of Partial Discharge Testing
• Advances in Partial Discharge Monitoring

Advanced Understanding ⁴

• Megger Q&A: Partial discharge testing
• The Lights are Still On!
• Preventing underground cable failure with partial dicharge testing

Last Update: Feb 02, 2025