IEC 62823:2015

Overview

IEC 62823:2015 is an international standard published by the International Electrotechnical Commission (IEC) that specifies the electrical testing requirements for thyristor valves used in Thyristor Controlled Series Capacitors (TCSC). This standard outlines the routine and type tests essential to ensure the operational safety and performance of air-insulated thyristor valves, which are critical components in AC power transmission systems. These valves operate primarily in capacitive boost or bypass modes within TCSC installations.

The document provides comprehensive guidelines on test conditions, procedures, and criteria for evaluating the electrical performance and robustness of TCSC thyristor valves. IEC 62823:2015 supports manufacturers, testing laboratories, and electrical utilities in validating equipment reliability under normal and fault conditions, helping to enhance grid stability and efficiency.

Key Topics

• Scope of Testing: Defines routine and type testing methodologies specific to TCSC thyristor valves, emphasizing electrical tests for dielectric strength, switching performance, and fault tolerance.

• Valve Operation and Waveforms: Details the operational modes of thyristor valves-including capacitive boost mode and bypass mode-and analyzes the characteristic current and voltage waveforms to inform testing parameters.

• Dielectric Testing: Specifies AC dielectric tests and impulse tests between valve terminals and enclosures to verify insulation integrity and resistance to overvoltages.

• Operational Tests: Includes requirements for firing and extinction behavior tests to ensure reliable valve switching and control during normal and transient conditions.

• Fault Current Tests: Defines testing under fault conditions with and without subsequent blocking to validate valve endurance and fault handling capabilities.

• Electromagnetic Disturbance Immunity: Establishes test procedures to assess valve insensitivity to electromagnetic interference, which is crucial for stable operation in high-voltage environments.

• Routine and Visual Inspections: Covers routine quality assurance checks such as visual inspection, connection verification, partial discharge testing, and cooling system pressure tests.

• Test Criteria and Performance Documentation: Provides criteria for successful testing outcomes at both valve level and overall assembly, along with guidelines for reporting and documenting test results.

• Annexes: Supplementary information on TCSC operating conditions, rating considerations, power oscillation damping, subsynchronous resonance mitigation, and fault tolerance of valve components.

Applications

IEC 62823:2015 is essential for:

• Manufacturers of Thyristor Valves and TCSC Systems: To perform standardized testing ensuring compliance and quality control before releasing equipment to market.

• Utility Companies and Power Transmission Operators: For verifying equipment reliability, maintenance planning, and approvals needed for integration of TCSC solutions to improve grid stability and reactive power compensation.

• Testing Laboratories: Providing accredited electrical testing services aligned with international standards for TCSC thyristor valves.

• Consulting Engineers and System Designers: To design and specify TCSC equipment meeting recognized performance and safety criteria necessary for high-voltage AC transmission systems.

Using this standard mitigates risks associated with electrical faults, enhances equipment lifespan, and supports the deployment of advanced reactive power control technologies in modern electrical grids.

Related Standards

• IEC 60146 Series: Semiconductor converters, including guidelines for thyristor valve assemblies used in power electronics.

• IEC 61000 Series: Electromagnetic compatibility (EMC) standards relevant for disturbance immunity tests.

• IEC 60871: Series capacitors for AC power systems, providing complementary requirements.

• IEC 62052-11: Electricity metering equipment testing, applicable for monitoring TCSC control systems.

• IEC 60480: Guide on the selection of insulating oils for electrical equipment, relevant for maintenance of valve insulation.

By aligning with IEC 62823:2015 and related standards, stakeholders ensure comprehensive assessment, reliable performance, and international acceptance of thyristor valves for TCSC applications in power transmission.