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

IEEE / ANSI

ANSI/IEEE Neutral-current measuring relay form

This reference locates neutral-current measuring relay in Autodesk's IEEE-oriented current protection relays family. This relay form is used where a CT is installed in a neutral conductor or in the earthing connection of a transformer or generator star point. Current there indicates earth faults or, in four-wire systems, heavy unbalance and triplen harmonic loading, depending on where the CT sits. The public library uses HCR1F32 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.

Drawing use: Schematic / SLD
Application: Metering & protection
Reference family: IEEE / ANSI / Manufacturer
Form evidence: In Neutral. Autodesk IEEE Symbol Preview: Current Protection Relays, block HCR1F32. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.

A distinction that matters

A neutral-current relay measures one neutral path; a residual connection sums the three phase CTs to derive the same quantity.

Full reference

Symbols

Neutral-current measuring relay

This relay form is used where a CT is installed in a neutral conductor or in the earthing connection of a transformer or generator star point. Current there indicates earth faults or, in four-wire systems, heavy unbalance and triplen harmonic loading, depending on where the CT sits.

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

A distinction that matters

A neutral-current relay measures one neutral path; a residual connection sums the three phase CTs to derive the same quantity.

Full reference

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