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D2275-22 – Standard Test Method Technical Guide
ASTM D2275-22 determines the voltage endurance of solid electrical insulating materials under surface corona at commercial power frequencies. This test method is designed for comparative evaluation of materials subjected to prolonged AC stress (Scope 1.1). Values are stated in SI units, with inch-pound conversions provided for information (Scope 1.2).
📐 Specimen Conditioning and Electrode Interface
Specimens are conditioned per Practice D618 to ensure uniformity. The electrode configuration produces corona at the edge of the interface, defined as visible partial discharges in gases adjacent to a conductor (Terminology D1711).
⚙️ Test Procedure and Corona Stress
The test applies alternating voltage stress at commercial power frequencies in the presence of corona. Corona, used here instead of “partial discharge,” is a visible glow at the electrode interface (Note 1). Voltage endurance is measured as time to failure under these conditions.
📊 Key Terminology and Definitions
The following table summarizes critical definitions from the standard:
| 🟦 Term | 📏 Definition | 🎯 Reference |
|---|---|---|
| Surface Corona | Corona that exists in the electrically stressed gas where electrodes are near insulation surfaces. | Section 3.2.1 |
| Threshold Voltage | That voltage below which failure will not occur under the test conditions irrespective of the duration of the test. | Section 3.2.2 |
| Voltage Endurance | The time that an insulating material can withstand a prolonged alternating voltage stress under the action of surface corona. | Section 3.2.3 |
⚠️ Safety Precautions: Refer to Section 7 for specific hazard statements. Establish appropriate safety practices per regulatory limits (Section 1.3).
💡 Comparative Use: This method is optimized for relative ranking of materials under prolonged AC corona stress.
❓ Frequently Asked Questions
🔍 What is the purpose of ASTM D2275?
To determine voltage endurance of solid insulating materials under corona at power frequencies.
💡 How is corona defined?
As visible partial discharges in gases adjacent to a conductor, per Terminology D1711.
⚡ What is threshold voltage?
The voltage below which failure does not occur regardless of test duration (Section 3.2.2).
📌 What conditioning practice is used?
Practice D618 for conditioning plastics before testing.