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D1868-24 – Standard Test Method Technical Guide
The ASTM D1868-24 standard, formally under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials, establishes a definitive methodology for the detection and measurement of partial discharge (corona) pulses. It is specifically designed for evaluating insulation systems by determining partial discharge (PD) inception and extinction voltages as the test voltage is raised and lowered, alongside quantifying apparent charge, pulse repetition rate, average current, quadratic rate, and power. The standard is broadly applicable to insulation systems subjected to test voltages ranging in frequency from zero (direct voltage) to approximately 2000 Hz.
📐 Scope and Applicable Systems
This test method provides versatile coverage across various electrical apparatus configurations. It is directly applicable to simple two-terminal capacitor models and extends to complex distributed parameter systems. The user must carefully account for specific phenomena such as pulse attenuation and reflection in distributed systems and potential accuracy loss in multi-terminal inductive windings.
| 🟦 System Type | 📏 Applicability | ⚡ Key Considerations |
|---|---|---|
| Simple Two-Terminal Capacitor | Directly applicable as a fundamental model | Basic representation of an insulation system (Section 1.2) |
| Distributed Parameter Systems (Cables, Machines) | Applicable with specific considerations | Attenuation and reflection phenomena must be managed (Section 1.3) |
| Multi-Terminal Systems (Transformers) | Applicable, but with reduced accuracy | Accuracy loss is significant for inductive windings (Section 1.4) |
⚠️ High Voltage Safety Protocols: Per Section 1.5, the user is responsible for establishing appropriate safety, health, and environmental practices. Specific precaution statements critical to safe operation are given in Sections 8 and 14 of the standard.
⚙️ Measurement Procedure and Key Parameters
© 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence.