PQ
Power quality analyser
Instrument that measures and logs harmonics, flicker, dips, swells and unbalance at a point of the network.
SLD / Schematic
Symbols · PM
Multifunction power meter
Digital panel meter that measures voltage, current, power, energy and power factor from one set of CT and VT inputs.
In plain English
What does Multifunction power meter mean?
A multifunction power meter replaces separate ammeters, voltmeters, wattmeters and energy meters with one digital device. On single-line diagrams it is drawn as one block at a feeder or incomer with its CT and VT connections, and on schematics its terminals show current inputs, voltage inputs, auxiliary supply and communications.
A simple example
Listing the meter once hides how many quantities it provides. The drawing or schedule should state which values are used for billing, monitoring or control, and which communication protocol carries them, because those uses carry different accuracy requirements.
What the drawings help you do
Separate the CT inputs, VT inputs and auxiliary supply terminals. Check which values are sent over communications. A multifunction meter measures many quantities; a single-function instrument shows one.
This particular reference
Digital panel meter that measures voltage, current, power, energy and power factor from one set of CT and VT inputs. A multifunction meter measures many quantities; a single-function instrument shows one.
- Terminal
- An identified point where a conductor connects.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Rating
- A value stating the conditions for which equipment is specified.
Read the source: PowerLogic ION9000 user manual · Power and energy measurement quantities
SLD / Schematic · PM
What it represents
A multifunction power meter replaces separate ammeters, voltmeters, wattmeters and energy meters with one digital device. On single-line diagrams it is drawn as one block at a feeder or incomer with its CT and VT connections, and on schematics its terminals show current inputs, voltage inputs, auxiliary supply and communications.
Listing the meter once hides how many quantities it provides. The drawing or schedule should state which values are used for billing, monitoring or control, and which communication protocol carries them, because those uses carry different accuracy requirements.
How to read it
- Separate the CT inputs, VT inputs and auxiliary supply terminals.
- Check which values are sent over communications.
Information to show or reference
- Show CT and VT ratios
- State auxiliary supply
- Reference communications address
A distinction that matters
A multifunction meter measures many quantities; a single-function instrument shows one.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
PowerLogic ION9000 user manual
Public meter manual describing measurement, logging and recording features of a revenue and power-quality meter.
Power and energy measurement quantities
Public explanation of energy and power measurement quantities used by meters.
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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