Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

46PD

Protection functions

Phase-discontinuity protection

Uses current-sequence relationships to detect a phase-discontinuity condition.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEEE / ANSI / Manufacturer

A distinction that matters

ABB's 46PD application is phase discontinuity; a phase-order relay and an ordinary overcurrent element address different conditions.

Full reference

Protection functions

Current unbalance / negative sequence

Device function number 46 is associated with reverse-phase or phase-balance current protection. Manufacturer implementations often use negative-sequence or current-unbalance quantities. The implementation, measurement basis and protected equipment must be identified in the protection documentation.

Drawing use: SLD / Schematic
Application: Metering & protection
Reference family: IEEE / ANSI

A distinction that matters

Current unbalance and voltage phase-sequence or balance functions use different measured quantities. Identify the element explicitly.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.