Psm Module Description And Specifications - GE PACSystems RX3i User Manual

Chapter
1
GFK-2749

PSM Module Description and Specifications

The Power Sync and Measurement (PSM) system monitors two independent three-phase
power grids. It incorporates advanced digital signal processor (DSP) technology to
continuously process three voltage inputs and four current inputs for each grid.
Measurements include RMS voltages, RMS currents, RMS power, frequency, and phase
relationship between the phase voltages of both grids.
The PSM module performs calculations on each captured waveform, with the DSP
processing the data in less than two-thirds of a power line cycle. The PSM module can be
used with wye or delta type three-phase power systems or with single-phase power
systems.
The PSM system can be used for applications such as:

Electrical power consumption monitoring and reporting

Fault monitoring

Generator control features for generator to power grid synchronization

Demand penalty cost reduction/load shedding
The PSM system consists of:
 PSM module – A standard IC694 module that mounts in an RX3i main rack. The
PSM module provides the DSP capability.
 Terminal Assembly – A panel-mounted unit that provides the interface between the
PSM module and the input transformers.
Interface cables – Provide the GRID 1 and GRID 2 connections between the PSM

module and the Terminal Assembly.
PSM System Features

Uses standard, user-supplied current transformers (CTs) and potential transformers
(PTs) as its input devices.

Accurately measures RMS voltage and current, power, power factor, frequency,
energy, and total, three-phase, 15-minute power demand.

Provides two isolated relays that close when the voltage phase relationships
between the two monitored grids are within the specified ANSI 25 limits provided by
the RX3i host controller. These contacts can be used for general-purpose, lamp duty
or pilot duty loads. Voltage and current ratings for these load types are provided on
page 1-5.

Provides a cable monitoring function that indicates when the cables linking the PSM
module and Terminal Assembly are correctly installed.

Can be easily calibrated using the Proficy* Machine Edition (PME) software to enter
calibration constants for the PSM module and Terminal Assembly.

The PSM001 module supports hot swap (removal and replacement in an RX3i rack
that is under power).
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