Sparks Electrical News October 2017

MOTOR CONTROL CENTRES AND MOTOR PROTECTION

16

FIT-FOR-PURPOSE VARIABLE SPEED DRIVES

A ltivar™ Easy 610 Variable Speed Drives (VSDs) improve equipment performance – particularly fans and pumps – and re- duce operating costs by optimising energy con- sumption and enhancing user comfort. Fit-for-purpose Altivar Easy 610 VSDs are IP 20 frequency inverters for controlling three phase synchronous motors, with a power range from 0,75 to 160 kW and a main voltage range of between 380 and 415 V. “The Altivar Easy 610 VSD has been designed especially for fan and pump applications in diverse industries, including water and wastewater, oil and gas, process and machine control, as well as building management. The robust system can withstand operation in harsh environments and is able to adapt to various levels of thermal stress,” says Brian Howarth, managing director, the Magnet Group. “The VSDs are designed for use in two operating modes that optimise the drive’s nominal rating according to the system constraints. “The two modes of overload - normal duty (ND) mode for applications requiring a slight overload and heavy duty (HD) mode for a significant

overload, ensure efficient operation in variable and constant torque applications associated with pumps, fans, compressors and conveyors.” Altivar Easy 610 VSDs have a communication module (Fieldbus embedded: Modbus) available for seamless integration into the main automation design. The drives feature various configurable I/O option modules as standard to facilitate adaptation to specific applications. The control terminal features analogue input and output, as well as digital input and relay output. This plug and play system, where parameters are pre-set in the factory to specific configurations, saves process control and operating time. Integrated radio interference input EMC C3- level filters create leakage current to ground and integrated dc chokes reduce harmonic distortion. The VSDs can operate safely in a temperature range of between -15˚C and +60 ˚C. Cooling air flow is separate from the printed circuit board to avoid dust and oil corrosion. Other protective features include a protective coating on the electronic cards and busbars have a plating to prevent chemical gas corrosion. A plain text terminal or optional remote

Altivar™ Easy 610 VSDs improve equipment performance and reduce operating costs.

enhanced by contactors and circuit breakers, which protect the drive’s power cables against short circuits. The system has been designed for simple installation, low maintenance requirements and efficient operating costs. Magnet supports Schneider’s Altivar range with a technical advisory and installation service throughout Southern Africa.

graphic display terminal, is used to control, adjust and configure the drive. The terminal displays current values and is able to download and store several configuration files. Removable terminals, with an LCD backlight screen, can be connected and mounted on the front of the drive or mounted on an enclosure door, using a remote mounting accessory. Coloured control circuit terminals prevent misuse. Performance of the Altivar Easy 610 is

Enquiries: +27 (0)31 274 1998

SAFEGUARDING OPERATIONAL LIFE OF SWITCHGEAR AT POWER PLANTS

ABB offers an enhanced solution using the VD4G vac- uum generator circuit breaker to extend the safe opera- tional life of electrical power plants. The solution can be used to modernise both ABB or non-ABB installed base. It can be used to extend the existing OneFit concept with new ratings, and covers generator protection applications to meet the demand of aging switchgear assets. ABB is launching the newgenerator application as part of the type-tested OneFit solution to retrofit the installed base. It is a cost competitive solution as normally only a few generator breakers are needed in a hydro, combined heat or power generator plant. OneFit provides a solution and at the same time gives all the retrofill advantages, such as enhanced safety and modernisation. It is also suitable for onshore application in oil and gas and heavy industry using combined generation. This new release covers the brown field requirements of generator applications and it combines OneFit with the standard VD4G vacuum generator circuit breaker up to 15 kV operating voltage with 17.5 kV rated insulation class, up to 100 MVA. OneFit is available in different versions, for narrow and wide panels, to provide the most convenient solution to meet different application requirements. The range has been extended to generator application with higher rated and short circuit current values. It is type tested by using dual logo IEC/IEEE 62271-37-013 withdrawable VD4G circuit breakers. VD4G standard breaker on-board the OneFit is the preferred option in generator application, offering a fully qualified solution, safety upgrade by closed door operation and remote motorized racking. ABB Service offers the application analysis service that is needed for the retrofit. Enquiries: www.abb.com MULTILIN M60 MOTOR PROTECTION SYSTEM

T he M60 motor protection system offers compre- hensive protection and control solutions for medi- um to large-sized three-phase motors. The M60 provides superior protection, control, and diagnostics that include thermal model with RTD and current unbalance biasing, stator differential, reverse and low forward power, external RRTD module, two-speed motors, reduced volt- age starting and broken rotor bar detection. Key benefits include: • Improved protection sensitivity through a flexible and powerful thermal model including standard, custom, and voltage dependent overload curves. • Simplified programming with the EnerVista™ M60 motor settings autoconfigurator. • Application flexibility with multiple I/O options in- cluding high density I/O, programmable logic, modu-

larity, and specific customisation. • High-end fault and disturbance recording. • Reduced relay-to-relay wiring and associated costs through high-speed inter-relay communications. The system is ideal for automation or process control functionality, the protection of medium to large synchro- nous motors when paired with the SPM and as stand- alone protection or component in automated substation control systems.

www.gegridsolutions.com

SPARKS ELECTRICAL NEWS

OCTOBER 2017