PQM POWER QUALITY METER – INSTRUCTION MANUAL
1–1
PQM Power Quality Meter
Chapter 1: Overview
GE Consumer & Industrial
Multilin
823 8 A4 CDR
STATUS
COMMUNICATE
RELAYS
VALUE
MESSAGE
ACTUAL
SETPOINT
RESET
STORE
SIMULATION
ALARM
SELF TEST
PROGRAM
TX2
TX1
RX2
RX1
AUX2
ALARM
AUX3
AUX1
PQM
Power Quality Meter
g
Ia = 100 Ib = 102
Ic = 100 AMPS
Overview
1.1
Introduction
1.1.1
Description
The GE Multilin PQM Power Quality Meter is an ideal choice for continuous monitoring of a
single or three-phase system. It provides metering for current, voltage, real power, reactive
power, apparent power, energy use, cost of power, power factor, and frequency.
Programmable setpoints and four assignable output relays allow control functions to be
added for specific applications. This includes basic alarm on over/under current or voltage,
unbalance, demand based load shedding, and capacitor power factor correction control.
More complex control is possible using the four switch inputs; these can also be used for
status information such as breaker open/closed, flow information, etc.
As a data gathering device for plant automation systems that integrate process,
instrument, and electrical requirements, all monitored values are available via one of two
RS485 communication ports running the Modbus protocol. If analog values are required
for direct interface to a PLC, any of the monitored values can output as a 4 to 20 mA (or 0
to 1 mA) signal to replace up to 4 separate transducers. A third RS232 communication port
connects to a PC from the front panel for simultaneous access of information by other
plant personnel.
With increasing use of electronic loads such as computers, ballasts, and variable
frequency drives, the quality of the power system is important. With the harmonic analysis
option, any phase current or voltage can be displayed and the harmonic content
calculated. Knowledge of the harmonic distribution allows action to be taken to prevent
overheated transformers, motors, capacitors, neutral wires, and nuisance breaker trips.
Redistribution of system loading can also be determined. The PQM can also provide
waveform and data printouts to assist in problem diagnosis.
Economical system monitoring or control is possible by selecting the non-display chassis
model as a system component and adding required options to obtain the desired level of
functionality.
Содержание Multilin PQM
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