Electricity + Control August 2016

DRIVES, MOTORS + SWITCHGEAR T AN FORME UBSTATIONS

• 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.

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

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 denvertech@pixie.co.za

TRANSFORMERS + SUBSTATIONS

ROUND UP

New 300 kHz to 200 MHz antenna and cable analyser

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

Bird Technologies, a provider of RF com- ponents, subsystems, test equipment, and

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 sales@comtest.co.za

August ‘16 Electricity+Control

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