Electricity + Control July 2015

CONTROL SYSTEMS + AUTOMATION

ROUND UP

Multi-channel device circuit breaker boards

The new multi-channel device circuit breaker boards from Phoenix Contact are available with 4, 8, and 12 channels. The

equipment as part of Lucy’s after service care offering. The existing power distribu- tion network of ECG consisted of 48 439 km of 33 kV, 11 kV and low voltage overhead distribution lines. The initial phase of the project involved automating the network, which focused on the 33 kV radial overhead feeders across the regions of Bogoso and Tokuse, in addition to parts of the 11 kV underground network in the capital city of Accra.The automated field devices, such as the remotely controlled gas-enclosed load break switch (Rapier GX), were complete with fault passage indicators and retrofit with RMU actuators and interfacing Gemini RTUs/ communication modems. To give ECG full visual control and data accessibility to the network, Lucy Electric installed a standalone Gemini SCADA pack- age. A key benefit being that the system architecture can be upgraded to manage network expansion in the future. In addition to this, a Gemini DC (Data Concentrator) was installed, which would prevent server overloads and minimise communication traffic.To do this, secondary RTUs were integrated into the existing DMS/ SCADA systems to provide a centralised and boards are very versatile as they can be fitted individually with thermomagnetic or electronic circuit breakers. They are par- ticularly suitable for machine building and control and process technology. Owing to the central potential distribu- tion, up to four loads can be protected per channel. This reduces installation time to a minimum, while simultaneously saving space compared to conventional installa- tions. In addition to individual load protec-

tion, the boards give you the option to loop in safety-related relay contacts. As such, the affected circuits are integrated into the safety concept with minimal wiring. In do- ing so, the switch contacts of the enabling current paths are protected according to regulations. A supply of up to 60 A can be achieved thanks to the high current carry- ing capacity.

Enquiries:Tony Rayner. Email tonyr@phoenixcontact.co.za

Distribution network efficiency in Ghana

The Electricity Company of Ghana (ECG) is responsible for the distribution of electricity in the southern part of Ghana, namely the Ashanti, Central, Eastern, Greater Accra, Volta and Western Regions. ECG is owned by the government of Ghana and provides electricity to 2,5 million customers. With increasing demands on the network from its growing customer base, ECG felt compelled to improve resilience and cus- tomer service throughout its operations. Pressing issues for the ECG ranged from frequent customer outages to operational and maintenance costs, which ultimately re- sulted in common electricity revenue losses as well as being a significant burden on the impacted community and businesses, affecting the economy and potentially dis- rupting critical infrastructure. ECG approached Lucy Electric and the company created a tailored automation programme in which it would be able to deliver on ECG’s objectives, including the design work, manufacture and delivery of the equipment to Ghana from the UK, within six months. Lucy Electric also developed a bespoke training course to ensure that lo- cal engineers would be able to manage the

distributed data process.The installation of radio repeaters at strategic locations along the network provided an ideal solution ensuring that communication functioned correctly over tough terrain such as rocky and jungle areas. The high power radio communication links incorporated 'store and forward' techniques to enhance the distances covered.This system was helped by successful design, manufacture and delivery of power and distribution equip- ment to ECG. Enquiries:Visit www.lucyelectric.com

Compact modules for limited space TheAS-i M8modules from ifmelectronic are suitable for applications where space is limited.The units have been equipped with ecolink connection technology and the full potting ensures high shock and vibration resistance.The compact modules require little space due to their slim design.They are suitable for robotics, handling technology and assembly technology.The modules have a protection rating of IP67/IP68 and are quickly and easily installed via two fixing holes from the front or from the side.The ecolink technology mounts easily. An integratedmechanical end stop protects the O-ring fromdamage and rapid and secure installation is possible without a torque wrench. Enquiries:Tel. 012 450 0370 or email info.za@ifm.com

Electricity+Control July ‘15

16