PH LOSS
Phase-loss monitoring relay
A phase-loss relay supervises the presence of the specified phases in a three-phase system.
SLD / Schematic
IEEE / ANSI · PH LOSS
ANSI/IEEE Phase-loss monitoring relay form
IEEE-library form of phase-loss monitoring relay: a phase-loss relay supervises the presence of the specified phases in a three-phase system.
In plain English
What does ANSI/IEEE Phase-loss monitoring relay form mean?
This reference locates phase-loss monitoring relay in Autodesk's IEEE-oriented miscellaneous relays family. A phase-loss relay supervises the presence of the specified phases in a three-phase system. The drawing identifies the monitored source and output used by control or protection logic. The public library uses HCR1F42 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.
A simple example
Trace the measured quantity or initiating control signal separately from the output contacts. The device tag links the sensing or operating element to the controlled circuit; settings, reset behaviour and the actual terminal arrangement belong in the selected equipment documentation.
What the drawings help you do
Check whether phase sequence or voltage unbalance is also configured in the selected device. Phase loss is different from phase reversal or current unbalance. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.
This particular reference
IEEE-library form of phase-loss monitoring relay: a phase-loss relay supervises the presence of the specified phases in a three-phase system. Phase loss is different from phase reversal or current unbalance.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
- Coil
- A wound conductor that can produce a magnetic field when energised.
- Phase
- One of the related AC waveforms in a power system.
Read the source: Autodesk IEEE Symbol Preview: Miscellaneous Relays
IEEE / ANSI · Relay Sensing Lack of Phase in Three Phase System
Autodesk IEEE Symbol Preview: Miscellaneous Relays, block HCR1F42. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
SLD / Schematic · PH LOSS
What it represents
This reference locates phase-loss monitoring relay in Autodesk's IEEE-oriented miscellaneous relays family. A phase-loss relay supervises the presence of the specified phases in a three-phase system. The drawing identifies the monitored source and output used by control or protection logic. The public library uses HCR1F42 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.
Trace the measured quantity or initiating control signal separately from the output contacts. The device tag links the sensing or operating element to the controlled circuit; settings, reset behaviour and the actual terminal arrangement belong in the selected equipment documentation.
Check whether phase sequence or voltage unbalance is also configured in the selected device. Phase loss is different from phase reversal or current unbalance. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.
How to read it
- Check whether phase sequence or voltage unbalance is also configured in the selected device.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.
Information to show or reference
- Show phase measurement inputs
- State enabled functions
- Reference output logic
A distinction that matters
Phase loss is different from phase reversal or current unbalance.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEEE Symbol Preview: Miscellaneous Relays
Public IEEE-oriented Miscellaneous Relays table explicitly lists HCR1F42 as Relay Sensing Lack of Phase in Three Phase System. This supports the vendor convention context, not reproduction of the publisher graphic.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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