Overview
IEC 62032:2012 (Edition 2.0) - published under the IEC/IEEE dual-logo agreement and aligned with IEEE Std C57.135:2011 - is a guide for the application, specification and testing of phase‑shifting transformers (PSTs). The standard covers single‑phase and three‑phase, oil‑immersed PSTs and addresses theory of operation, factory and field testing, and PST‑specific design and control issues. It is explicitly limited to matters particular to PSTs and does not replace general power transformer standards or recommended practices.
Key topics and technical requirements
The guide organizes PST‑specific guidance around practical and technical themes, including:
- Theory of operation and application: basic principles of advancing and retarding phase angle to control power flow.
- PST behavior under load and power transfer: operational characteristics and how PST settings affect transmission network flows.
- Types and construction: single‑core, dual‑core and series/exciting unit arrangements; oil‑immersed construction considerations.
- On‑load tap changer (OLTC) features: special OLTC functions and controls unique to PSTs.
- Arrangements and design criteria: multi‑PST configurations and selection guidance to meet system objectives.
- Service conditions and protection: usual and unusual service environments, loading at non‑rated conditions, and protective requirements.
- Rating data and nameplate information: polarity, angular displacement, impedance, and required marking.
- Short‑circuit characteristics and testing: short‑circuit requirements and special tests applicable to PSTs.
- Control systems and test codes: control equipment, accessory requirements, and standardized test procedures for control systems.
- Factory and field testing: special tests for PSTs in addition to general transformer tests, plus tolerances and bid checklist items.
Practical applications
IEC 62032 is intended to support the specification, procurement and verification of PSTs used to:
- Control active power flow on transmission corridors
- Manage loop flows and congestion in interconnected networks
- Implement dynamic phase angle control for grid stability and market operations
The standard helps ensure PSTs are specified, tested and commissioned to achieve predictable performance in real power systems.
Who should use this standard
- Transmission system operators and utilities preparing PST specifications
- Transformer manufacturers and OEMs designing PSTs
- Test laboratories and commissioning teams performing factory and field testing
- Consulting engineers specifying system control strategies and protection schemes
Related standards
IEC 62032 focuses on PST‑specific matters; general power transformer requirements remain governed by other IEC/IEEE transformer standards and recommended practices (refer to national and IEC publications for general transformer design and safety requirements).
Keywords: IEC 62032, phase‑shifting transformers, PST, power flow control, IEEE C57.135, on‑load tap changer, OLTC, transformer testing, transmission system.