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PSL specialises in the manufacture
of instrumentation for power quality
monitoring and immunity.
Industrial Power Corruptors make bad
quality in order to test the
response of equipment, such as
protective relays, UPS systems, etc.
These IPC's take clean,
utility-grade power and add
carefully calibrated voltage sags
(dips), swells, and interruptions at
the touch of a trigger. The built-in
data acquisition system includes a
28-channel digital scope, and
optionally a complete harmonic and
power flow analyser. Ideal for
current inrush testing and standards
compliance, including SEMI F47, IEC
61000-4-11, 61000-4-34, CBEMA, ITIC,
IEEE-1100, and more.
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Power quality
relays
PQ1
The PQ1 power quality relay from
Power Standards Laboratory can
monitor voltage swells, sags,
interruptions and impulses as short
as 500 nanoseconds.
The PQ1 power quality relay's
normally-closed contacts open
for a minimum of 3 seconds each
time a disturbance is detected.
This provides an ideal interface
for counters, error logs, SCADA
systems, PLCs and building
management systems, creating a
history of voltage disturbance
events to which plant and
equipment have been subjected.
The contacts can also be used to activate
process related alarms and interlocks to
minimise product wastage. Latched LEDs give
a visual indication and maintain their state
during power failures.
The PQ1 is a single phase monitor that
connects directly to 100V rms to 240V rms
nominal supplies, or higher voltages using a
step-down transformer. Use three PQ1 units
to monitor a three phase power system.
PQube
The new PQube DIN-rail
mountable power and
disturbance monitoring relay
captures voltage
disturbances and
time-stamped waveforms,
storing captured information
on a plug-in 4 GB SD card
that provides exportable CSV
Excel-compatible and GIF
picture files. Information
can be exported via Ethernet
with e-mail, DHCP, FTP, and
SNTP options. Disturbance
monitoring covers voltages
ranging from 100 V to 600 V
at frequencies of 50, 60,
and 400 Hz for single phase,
split-phase and three-phase
delta- and star-connected
circuits. Parameters
analysed include dips,
swells, sags, interruptions,
waveform faults, frequency
variations, and impulse
detection. The PQube relay
can optionally monitor
current and power utilising
a maximum 20 Amp direct
input or 1- and 5-Amp CT
input. Other options include
kW, kVAR, power factor and
energy usage, harmonics and
flicker. Additionally
temperature and humidity
probes may be connected for
climate conditioning
monitoring applications and
the relay can be utilised in
control schemes by virtue of
DNP3 and Modbus protocol
options. The PQube complies
with performance criteria as
specified by IEC 61000-4-30,
safety requirements
according to TUV, ISA, CSA
and S-mark (Japan) and
emission standards EN 55022
and CISPR 22.
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