Understand the difference.

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

TVB

Symbols

Time-alignment validation boundary

Identifies the source and client timing points included in the defined synchronization assessment. A station time system provides a shared time reference for protection records, measurements and automation. Different devices can use different timing protocols, so the time source, distribution path and quality information must remain identifiable.

Drawing use

Schematic

Application

Metering & protection

Reference family

Manufacturer

A distinction that matters

The drawing does not establish measured timing performance. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

Full referenceAdd to legend

SOE

Symbols

Sequence-of-events recorder

A sequence-of-events recorder monitors breaker auxiliary contacts, protection trip outputs, alarms and other binary signals, and stores each change with an accurate timestamp. After an incident the list shows which device operated first, which is often impossible to tell from alarms alone.

Drawing use

Schematic

Application

Metering & protection

Reference family

Manufacturer

A distinction that matters

An SOE recorder logs binary changes in time order; a disturbance recorder captures analogue waveforms.

Full referenceAdd to legend

Follow the full entry for source drawings and the appropriate standard or selected product. Equipment previews show a manufacturer drawing where available, otherwise a 3D thumbnail.