IEC 61954:2021

Overview

IEC 61954:2021 - Static VAR compensators (SVC) - Testing of thyristor valves - defines the framework for type, production and optional tests on thyristor valves used in TCR (thyristor controlled reactors), TSR (thyristor switched reactors) and TSC (thyristor switched capacitors) that form part of static VAR compensators (SVC) for power system use. The standard applies to both single-valve (one phase) and multi-valve units. Clauses 4–7 specify type tests, Clause 8 covers production tests, and Clauses 9–10 list optional tests. This edition (3.0, 2021) includes important clarifications to multiple clauses and incorporates the June 2024 corrigendum.

Key Topics

• Scope and objectives: Verification that valve design and manufacture meet performance, safety and dielectric requirements for power-system SVC applications.
• Type tests (design validation): Dielectric testing (AC, AC–DC, lightning and switching impulse), operational testing (periodic firing/extinction, minimum AC voltage, temperature rise), electromagnetic interference (EMI) tests and overcurrent/short-duration tests.
• Production tests (manufacturing quality control): Visual inspection, connection checks, voltage-dividing/damping circuit checks, voltage withstand, auxiliary checks, firing checks, cooling system pressure tests and partial discharge measurement.
• Optional tests: Overcurrent (with/without blocking), positive voltage transient during recovery, non-periodic firing tests and other tests requested by purchaser or specified in project contracts.
• Test conditions and documentation: Requirements for valve temperature at test, permissible component failures during type testing, and contents of type test reports to support certification and acceptance.
• Electromagnetic compatibility: Procedures to assess EMI and switching transients that may affect grid equipment and communications.

Applications

• Type approval and qualification of thyristor valves for SVC projects.
• Factory production control and routine acceptance testing to ensure conformity with design and safety requirements.
• Site acceptance testing for SVC installations in substations and transmission systems.
• Design verification and R&D for manufacturers developing new valve configurations or multi-valve units.
• Procurement and specification: Buyers and utilities use IEC 61954 to define test requirements in contracts and tender documents.

Who uses this standard

• SVC and power-electronics manufacturers
• Independent testing laboratories and certification bodies
• Transmission/distribution utilities and substation engineers
• System integrators, consultants and procurement teams

Related Standards (if applicable)

Refer to other IEC and industry standards for complementary requirements on high-voltage testing, power-electronics equipment, and electromagnetic compatibility when specifying or applying IEC 61954:2021.