GB/T 18891-2009
AbolishedIdentification by hour numbers of the phase conductors of 3-phase electric systems
三相电力系统相导体的钟时序数标识
Application Summary AI generated
GB/T 18891-2009 specifies a method for identifying phase conductors in three-phase electric systems using hour numbers (e.g., 1, 3, 5) to indicate phase sequence and timing relationships. It is applied in electrical engineering for the design, installation, and maintenance of power distribution systems, transformers, and switchgear to ensure consistent phase identification across equipment and wiring. This standard is particularly relevant for industrial and utility electrical systems where accurate phase alignment is critical for safe parallel operation and fault prevention.
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Transparency note: The application summary and key sentences on this page were automatically generated by AI from the standard's original text. This content has not been human-verified and should not be used for compliance or regulatory purposes. Always refer to the official standard document from the issuing authority.