Electricity + Control

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DRIVES, MOTORS + SWITCHGEART AN FORME UBSTATIONS
Patrick Schuler has been working in the internet, telecom-
munications, smart grid, power electronics and power
utility sector for more than 15 years. Since joining LEM in
September 2014, Patrick has been responsible for defining
the global smart grid offering and managing smart grid
business development. As a smart grid expert, Patrick is a
member of the IEC’s world smart city community in Geneva
and was the former smart grid chairman at the China European Chamber of
Commerce in Beijing. Enquiries: Mervyn Stocks. Denver Technical Products.
Tel. +27 (0) 11 626 2023 or email
leads to the implementation of more current sensors
to allow control rooms to automate, monitor remotely
and share real-time data of equipment.With the aim to
bringmore harmonisation in the smart grid landscape,
the International Electrotechnical Commission (IEC)
builds foundations in every field to provide a strong,
resistant and secured electrical grid. Robust and accurate
sensors in this network are major challenges to respond to
this demanding environment. IEC 61869 [1] is the new perfor-
mance standard for sensors, replacing the old IEC 60044 [2] standard
for current transformers. ART Rogowski coils sensors are designed
and tested against a strict characterisation test plan established by
LEM experts to comply with and contribute to this evolution. Due
to its strong knowledge in accurate measurement, LEM guarantees
the measurement repeatability of all of its transducers and accuracy
of Class 1.0 according to IEC 61869-2 [1] for ART models for use in
future smart cities and their applications.
Reference
[1] IEC 61869. Standard for Instrument Transformers.
Part 1: General requirements.
Part 2: Additional requirements for Current Transformers.
take note
New 300 kHz to 200 MHz antenna and cable analyser
Bird Technologies, a provider of RF com-
ponents, subsystems, test equipment, and
services – represented locally by COMTEST
Solutions – has introduced their SiteHawk
SK-200-TC, a handheld antenna and cable
analyser that operates between 300 kHz and
200 MHz. The instrument simplifies detec-
tion of problems in coaxial transmission
lines and antenna systems, and pinpoints
their source using distance-to-fault meas-
urements.
The SiteHawk SK-200-TC provides all of
the measurement capabilities required to
evaluate the performance of a communica-
tion system’s transmission path, and has the
same features as its higher-frequency coun-
terpart, Bird’s SiteHawk SK-4000-TC, which
operates over a frequency range of 85 MHz
to 4 000 MHz. The SiteHawk SK-200-TC is
a rugged, compact instrument, measuring
only 18,2 x 9,6 x 4,8 cm and weighing 900 g,
that is easy to use by novices and veterans
alike. It has an intuitive user interface dis-
played on its high-resolutionTFT LCD color
display that is readable in bright sunlight,
and has 16 Gbytes of internal flash memory
for storing thousands of traces and meas-
urement setups.
The distance-to-fault measurement indi-
catesVSWR or return loss at various points
from the beginning of the transmission line
all the way to the antenna and identifies the
location of a problem with high resolution.
The cable loss function measures insertion
loss of the transmission line over a given
frequency range.
Enquiries:Tel. +27 (0) 10 595 1821 or
email
ROUND UP TRANSFORMERS + SUBSTATIONS
• A Rogowski coil has a lower in-
ductance than current transformers.
• It has a better frequency re-
sponse because it uses a non-
magnetic core material.
• It is highly linear, even with high
primary currents, because it has no
iron core that may saturate.
33 August ‘16 Electricity+Control