Iec 60815-2 Pdf -
IEC 60815-2 is the international standard that gives procedures for selecting and testing insulators used on overhead power lines, focusing on how to evaluate pollution performance and determine the necessary electrical stress (power-frequency withstand, switching impulse, etc.) for long-term service in polluted environments. Part 2 specifically covers laboratory and site test methods and guidance for assessing pollution severity and how to apply those results to insulator selection.
IEC 60815-2 defines four main Site Pollution Severity (SPS) classes for AC:
| SPS Class | Typical Environment | ESDD (mg/cm²) | Recommended USCD (mm/kV) | |-----------|---------------------|---------------|--------------------------| | a – Light | No industrial, inland, low density housing | < 0.03 | 16 – 20 | | b – Medium | Industrial areas, moderate coastal | 0.03 – 0.10 | 20 – 25 | | c – Heavy | Heavy industry, high coastal salt, desert with dust | 0.10 – 0.60 | 25 – 31 | | d – Very Heavy | Desert with salt/conductive dust, sea spray, high ESDD | 0.60 – 2.0 | 31 – 43+ |
Note: For very severe cases (>2.0 mg/cm² ESDD), custom dimensioning or mitigation (e.g., washing, coating) is required.
IEC 60815-2: Selection and use of surge arresters - Part 2: Selection and use of surge arresters for HV power systems
IEC 60815-2 is a standard published by the International Electrotechnical Commission (IEC) that provides guidelines for the selection and use of surge arresters for high-voltage (HV) power systems. The standard is part of the IEC 60815 series, which deals with the selection and use of surge arresters.
Scope
The scope of IEC 60815-2 is to provide recommendations for the selection and use of surge arresters for HV power systems, including:
Key aspects of the standard
The standard covers the following key aspects:
Benefits of using IEC 60815-2
The use of IEC 60815-2 provides several benefits, including:
Who should use IEC 60815-2?
IEC 60815-2 is relevant to a wide range of stakeholders, including:
By following the guidelines and recommendations outlined in IEC 60815-2, users can ensure that surge arresters are selected and used effectively to protect HV power systems against overvoltages and surge events.
IEC/TS 60815-2 is a technical specification for the selection and dimensioning of high-voltage ceramic and glass insulators used in a.c. systems exposed to polluted environments. It complements the general principles in Part 1 to help designers calculate exact creepage distances and evaluate insulator profiles. Core Objectives The standard provides a structured method for engineers to:
Determine RUSCD: Calculate the Reference Unified Specific Creepage Distance (RUSCD) based on the site's pollution severity (SPS).
Apply Correction Factors: Adjust dimensions for insulator shape, diameter, altitude, and mounting position.
Evaluate Profiles: Assess the suitability of different shed designs (e.g., standard, fog, or open profiles) for specific pollution types.
Define Test Parameters: Establish methods to verify performance through natural or artificial pollution tests. Key Technical Parameters
The specification uses Site Pollution Severity (SPS) classes to determine the required creepage distance: Pollution Level Basic RUSCD (mm/kV) Very Light Light Medium Heavy Very Heavy iec 60815-2 pdf
Note: These values are based on the phase-to-earth voltage ( Recent Revisions (2025 Edition)
The 2025 update (Edition 2.0) introduces several technical refinements:
Updated Definitions: Revised terms for USCD, nominal creepage distance, and insulator trunk.
Revised Correction Factors: Improved calculations for altitude, diameter, and the number of parallel insulators.
Simplified Suitability: A more streamlined approach for evaluating ceramic and glass profile suitability. Practical Resources Revising IEC/TS 60815 Series & IEC 62217 - - INMR
The IEC 60815-2 standard is a critical technical framework for the selection and dimensioning of high-voltage insulators intended for use in polluted conditions. As part of a larger series, Part 2 specifically focuses on glass and porcelain insulators for AC systems, providing the engineering community with standardized methods to ensure electrical grid reliability. The Purpose of IEC 60815-2
In high-voltage engineering, pollution is a primary cause of insulator flashover, which can lead to catastrophic grid failures. When salt, dust, or industrial particulates accumulate on an insulator surface and become moist (due to fog or light rain), they form a conductive layer. IEC 60815-2 provides the methodology to determine the "Site Pollution Severity" (SPS) and subsequently choose an insulator design—specifically its Unified Specific Creepage Distance (USCD)—that can withstand these environmental stresses. Key Components of the Standard
The essay of this technical standard revolves around three pillars:
Pollution Characterization: It defines five classes of pollution severity, ranging from "Very Light" to "Very Heavy." This allows engineers to categorize a substation or transmission line location based on measured data like Equivalent Salt Deposit Density (ESDD) or directional dust moisture.
Insulator Profiles: Unlike generic guidelines, Part 2 provides detailed analysis of porcelain and glass shapes. It evaluates how different "shed" profiles (the disc-like parts of an insulator) perform under specific types of pollution, such as desert sand versus coastal salt spray. IEC 60815-2 is the international standard that gives
Dimensioning Logic: The standard moves away from older "rule of thumb" measurements. It utilizes the USCD, which is the total creepage distance divided by the highest operating voltage, to provide a precise requirement for the insulator’s length and surface area. Impact on Grid Reliability
The adoption of IEC 60815-2 has transformed how utilities manage infrastructure. By using the standard's formalized "Selection and Dimensioning" process, engineers can:
Reduce Maintenance: Properly dimensioned insulators require less frequent washing or silicone coating.
Optimize Costs: It prevents "over-engineering" where insulators are unnecessarily large and expensive, while ensuring they aren't so small that they risk frequent outages.
Standardize Procurement: It provides a common language for manufacturers and utility providers to ensure that components meet the specific environmental demands of the installation site. Conclusion
IEC 60815-2 is more than a technical manual; it is a foundational document for modern electrical infrastructure. By bridging the gap between environmental science and electrical engineering, it ensures that porcelain and glass insulators—the silent guardians of our power lines—remain resilient against the unpredictable challenges of the natural world. AI responses may include mistakes. Learn more
Since I cannot provide a direct PDF download of the copyrighted standard, I have prepared a comprehensive technical report summarizing the key concepts, scope, and methodology defined in IEC 60815-2.
The IEC 60815-2 PDF is not just a technical document; it is a critical risk management tool for every utility, railway, or industrial facility that operates high-voltage AC equipment in less-than-ideal environments. By providing a clear, stepwise methodology—from pollution classification to creepage distance selection and correction factors—it ensures that your insulators will withstand the harshest combination of salt, dust, and fog.
Do not rely on outdated rules of thumb or unauthorized copies. Purchase the official iec 60815-2 pdf from the IEC Webstore or your national body. Then, integrate its tables and formulas into your design workflow. Whether you are protecting a 33 kV distribution line or a 765 kV backbone, this standard is your ultimate guide to preventing the next costly flashover.
IEC 60815-2 provides a modern, scientifically refined methodology for dimensioning ceramic and glass insulators in polluted AC environments. Its introduction of SPS classes with ESDD ranges, shape factors, and voltage corrections makes it far more accurate than the 1986 version. For any utility or engineer designing outdoor HV AC lines or substations in polluted areas, compliance with this standard is essential to prevent flashovers and ensure long-term reliability. Note: For very severe cases (>2