IEC 60358-4:2018

Overview

IEC 60358-4:2018 is an international standard published by the International Electrotechnical Commission (IEC) that specifies requirements for DC and AC single-phase capacitor dividers. These capacitor dividers are connected between line and ground and are primarily used in manufacturing Voltage Transformers, among other applications. As part 4 of the IEC 60358 series titled Coupling capacitors and capacitor dividers, this standard must be used in conjunction with IEC 60358-1, which provides general rules. IEC 60358-4:2018 replaces the second edition IEC 60358 (1990) and introduces technical revisions ensuring alignment with modern manufacturing and application needs.

Key Topics

• Scope of Application: Covers single-phase capacitor dividers used between line and ground, designed for both DC and AC voltages. Focus is on their use in Voltage Transformer manufacturing and related applications.
• Type and Classification: Defines different types of capacitor dividers, such as capacitor voltage dividers (C-Divider), resistor-capacitor voltage dividers (R-C Divider, C-R Divider, R-C-R Divider) highlighting design variations involving capacitors and resistors.
• Voltage Ratings and Parameters: Specifies rated primary and secondary voltages, rated capacitances, as well as rated series and parallel resistances critical for manufacturing and testing.
• Design and Test Requirements: Details design rules, service conditions, and testing protocols including routine, type, and special tests relevant for performance evaluation and safety compliance.
• Terminology: Defines important terms such as voltage divider, rated primary/secondary voltage, and components within the divider including high-voltage and intermediate voltage capacitors to standardize communication.

Applications

IEC 60358-4:2018 plays a key role in ensuring the reliability and safety of voltage measurement systems by regulating single-phase capacitor dividers. Common applications include:

• Voltage Transformers Manufacturing: Capacitor dividers are integral in constructing voltage transformers that provide accurate voltage scaling and measurement in power systems.
• Power Quality and Monitoring: Used in equipment responsible for voltage measurement, capacitor dividers ensure precise monitoring of power systems for effective control and protection.
• Electrical Testing and Calibration: The standard facilitates industry-wide uniform testing, improving confidence in the accuracy and durability of devices employing capacitor dividers.
• High Voltage Equipment: Ensures capacitor dividers meet safety and performance requirements when installed in high voltage environments between line and ground.

Related Standards

• IEC 60358-1: General rules governing coupling capacitors and capacitor dividers; essential for comprehensive application of Part 4.
• IEC 60358-2: Addresses AC or DC single-phase coupling capacitors for power line carrier-frequency applications.
• IEC 60358-3: Applicable to AC or DC coupling capacitors used in harmonic-filter applications.
• IEC 61869 Series: Covers requirements for complete Voltage Transformers where capacitor dividers form a component.
• IEC 60050: Provides widely accepted electrotechnical vocabulary referenced within IEC 60358-4 for defining terms.

The IEC 60358-4:2018 standard improves the consistency of manufacturing and testing procedures for single-phase capacitor dividers, enhancing performance monitoring and operational safety in electrical power systems. Adhering to this standard ensures compliance with global best practices in voltage measurement instrumentation.