Understand the difference.

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

MSTI

Symbols

Microgrid synchronising timeout indication

Reports that the assigned synchronising process did not complete within its defined interval. Synchronising control compares two AC systems before their assigned connecting breaker closes. Voltage magnitude, frequency, phase relationship, breaker readiness and command authority are separate inputs to the closing decision.

Drawing use

Schematic

Application

Microgrid systems

Reference family

Manufacturer

A distinction that matters

The alarm should identify the unmet condition. 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

SYNC SCOPE

Symbols

Synchronoscope

A synchronoscope indicates the phase relationship and relative frequency behaviour of two AC sources. Its input connections identify which source is incoming and which is the reference.

Drawing use

SLD / Schematic

Application

Metering & protection

Reference family

IEC / Manufacturer

A distinction that matters

A synchronoscope provides indication; a synchronism-check relay provides a configured permissive output.

Full referenceAdd to legend

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