IEC 60358-3:2013

Overview

IEC 60358-3:2013 is an international standard published by the International Electrotechnical Commission (IEC) that specifies requirements for AC or DC single-phase coupling capacitors used in harmonic-filter applications. Designed for use at voltages higher than 1,000 V, these capacitors are connected between a power line and ground, either permanently earthed or connected to a tuning device. The standard is particularly relevant for electrical engineers and manufacturers specifying power capacitors for harmonic filtering in high-voltage networks. IEC 60358-3:2013 supplements and modifies IEC 60358-1:2012 with additional guidance specific to filter applications.

Keywords: coupling capacitor, harmonic filter, high-voltage, AC capacitor, DC capacitor, IEC 60358-3, tuning device.

Key Topics

• Scope and Applicability

  • Applies to single-phase coupling capacitors with rated voltages above 1,000 V.
  • Relevant for both AC and DC applications involving harmonic filtering.
  • Describes connection configurations including permanent earthing or use with a tuning device.

• Design Requirements

  • Emphasizes construction for operation in high-voltage environments.
  • Details minimum insulation requirements.
  • Specifies design considerations for low voltage terminals and tuning devices.

• Testing and Performance Evaluation

  • Outlines types and frequencies of routine and type tests:
    • Routine electrical tests for capacitors and tuning devices.
    • Impedance and capacitance measurements at specified frequencies.
    • Impulse voltage withstand tests for tuning devices.
  • Includes requirements for high-frequency characteristics to ensure filter performance.

• Marking and Documentation

  • Sets standards for rating plate markings, including manufacturer, type, schema, and key operating parameters.

Applications

Coupling capacitors compliant with IEC 60358-3:2013 are essential components in high-voltage power systems, particularly where harmonic filtering is required. Typical uses include:

• Harmonic Filter Circuits: Reducing harmonic currents in power transmission and distribution networks to maintain power quality and equipment longevity.
• HVDC and HVAC Transmission Systems: Used in both high-voltage alternating current (HVAC) and high-voltage direct current (HVDC) installations for harmonic rejection.
• Industrial Power Installations: Improving power factor and reducing interference in large industrial facilities.
• Integration with Tuning Devices: Capacitors combined with passive components to target specific frequencies in filter banks.

By setting performance, testing, and construction benchmarks, IEC 60358-3:2013 enables engineers and manufacturers to specify and select reliable capacitors for critical power system applications.

Related Standards

For comprehensive understanding and correct application, IEC 60358-3:2013 should be used in conjunction with related IEC standards, including:

• IEC 60358-1:2012 - Coupling capacitors and capacitor dividers – Part 1: General rules (base requirements for all coupling capacitors and dividers).
• IEC 60358-2 - Specifications for AC or DC single-phase coupling capacitors for power line carrier-frequency applications.
• IEC 60060-1 & IEC 60060-2 - High-voltage test techniques, providing general definitions and test methods.
• IEC 60481 - Coupling devices for power line carrier systems.
• IEC 61869-5 - Instrument transformers, with additional requirements for capacitive voltage transformers.
• Additional guidance: IEC 62001, IEC 60633, and IEC/TR 62543 for HVDC systems and terminologies.

Conclusion:
IEC 60358-3:2013 provides a dedicated framework for evaluating and implementing coupling capacitors in harmonic-filter applications, helping to ensure system performance, safety, and compliance in high-voltage electrical networks. It is a critical reference for power engineers focused on network quality and harmonic mitigation.