Sparks Electrical News August 2017

MOTOR CONTROL CENTRES AND MOTOR PROTECTION

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SHAW CONTROLS DELIVERS CONTAINERISED SOLUTION TO DRIVE MILL

Moss says that the ability to extract the most relevant data and provide this in an intuitive and simplified format allows both operational and service personnel to monitor the requisite parameters. This project made use of a WEG MVW01 VSD with 6,6 kV output. The input solution makes use of a 36 pulse rectifier and corresponding phase shift transformer. Moss explains that this combination was selected as the best option to minimise harmonics. The WEG MVW01 VSD range is available in 3.3 kV and 6.6 kV versions. This is a neutral point clamped (NPC) topology and makes use of 6,5 kV IGBTs. These VSDs are engineered with few components translating into high efficiencies and optimal reliability. Also available is the WEG MVW3000 which is available in 3.3 kV and 6,6 kV, and more recently in an 11 kV version. This is a cascaded H-bridge (CHB) topology which makes use of low voltage IGBTs. This has low voltage power cells with built-in redundancy (optional) which allows a faulty power cell to be automatically bypassed with a loss of performance.

SHAW CONTROLS, a Zest WEG Group company, reports the successful completion of its contract to supply a containerised electrical solution to a gold mine in West Africa. Kirk Moss, medium voltage manager at Shaw Controls, says the containerised solution will supply power to drive a mill on this new mine. “Containerised electrical solutions are becoming increasingly popular as these allow for speed of installation and are a particularly cost effective option for mine and plants operating in Africa,” Moss says. The custom engineered sub-station comprises a medium voltage (MV) WEG Variable Speed Drive (VSD) and a dry type phase shift transformer driving a 2 000 kW, 6 pole, 6,6 kV squirrel cage WEG electric motor. The VSD is housed in the container while the oil cooled transformer is housed outside of it to facilitate heat dissipation. Moss says that ShawControls has an established reputation for engineering and manufacturing quality bespoke containerised solutions at its Johannesburg facility. The extensive facility of over 12 000 m 2 is manned by a team of skilled technical personnel and having the whole construction take SPECTRA* SERIES 8000 LINE M otor control centres provide a conveni- ent, centralised means of protecting and controlling all of a facility’s motor loads. In many facilities today, these motor loads often are precision HVAC systems responsible for cooling sensitive electronic equipment - servers, routers, switches, PCs, etc. Any power outage or fault event could damage this equipment and ultimately bring all operations to a halt-resulting in financial losses. Since 1940, GE Motor control centres have been designed and manufactured with demanding appli- cations in mind. Built using Six Sigma quality guide- lines, GE MCCs offer application flexibility while adhering to stringent industry standards. These rugged steel-enclosed motor control cen- tres can be outfitted with an incredible number of electrical devices - including all of the following: • Solid state reduced voltage starters • AC adjustable speed drives • Meters • PLCs

place in one facility makes it easier for customers to do all quality and functional checks in one place. This solution underwent testing at Shaw Controls prior to being dispatched to site. “What is particularly interesting about the solution provided is that it has been specifically engineered for this particular application and utilises specialised software for frozen charge protection,” says Moss. The software, which interfaces with the VSD, allows the objective detection of a frozen charge condition by making use of torque measurements already being monitored by the VSD. “With the addition of an encoder fitted to the electricmotor,we are now able tomonitor mill angle. And with the torque and angle measurements it is possible to detect if cascading has occurred within the mill,” he explains. Another innovative feature of this solution is the supply of a human machine interface (HMI) in the form of an interactive touch screen which has been configured to allow different levels of access. This has been done in a user-friendly manner to ensure ease of use and also allow simple access to relevant data.

Shaw Controls’ product line includes MV switchgear and LV withdrawable MCCs – locally manufactured products that are independently certified in accordance with the IEC 62271-200 and IEC 61439-1/2 standards. According to IEC specifications, LV covers applications up to 690 V, while the MV range is from 1 kV up to 52 kV. All products carry ISO 9001 accreditation from Bureau Veritas. The custom engineered sub-station supplied by Shaw Controls to a mine in Mali.

Enquiries: +27 (0)11 723 6000

DOUBLE DOOR ENCLOSURE RANGE WITH UPGRADED PROTECTION DEGREE

UDP wall mounted enclosures in fibre-glass reinforced polyester are an affordable alternative to stainless steel cabinets for installations in challenging conditions. Eldon has replaced its entire UDP range of double door enclosures with upgraded units offering an increased protection degree. Every upgrade developed aims to help customers stay ahead in a dynamic industrial market. While the previous UDP double door wall mounted enclosure complied with IP54, the new version complies with IP65, enabling users to install the cabinets in even more demanding conditions. Designed for environments such as public utilities, oil refineries, the marine industry, photovoltaic energy, and the petrochemical industry, UDP double door polyester enclosures provide customers with an accessible and efficient alternative to stainless steel enclosures.

UDP wall mounted enclosures have double insulation to offer users maximum safety. Different modular enclosures can be combined to achieve larger configurations. Customer advantages: • Increased protection degree, now IP65. • Suitable for demanding environments. • Accessible and efficient alternative to stainless steel enclosures. • Double insulation for maximum user safety. Please note that there is also a change in the part code. The N has been removed, thus UDP125100N becomes UDP125100.

Enquiries: +27 (0)11 383 8300

SWITCHGEAR FOR ROSH PINAH

MOTOR PROTECTIVE CIRCUIT BREAKERS

inventory and transport-related costs. • Short-circuit proof up to 100 kA (400 V) up to 32 A 50 kA (400 V) to 65 A: short-circuit calculations and prefusing are unnecessary. • Plug-in trip blocks up to 65 A: enhance service-friendliness. • Accessories from PKZM0: minimise design engineering requirements and provides flexibility. • Incorporation into the system SmartWire-DT: increases the levels of system availability by the transfer of process-relevant data. SmartWire-DT Using the system SmartWire-DT, the measurement and status data of the PKE can be sent directly to the control for further processing, or directly to an HMI for visualisation of the motor output circuit data. The integration of the PKE into the system SmartWire-DT can be undertaken both for the individual PKE as well as for the PKE motor starter combinations MSC-DEA.

PKE motor-protective circuit-breakers with electronic wide-range overload protection offer an interesting alternative to the bimetal solution for motor currents up to 65 A. PKE motor-protective circuit- breakers complement the PKZ device family. Features: • Wide adjustment ranges • Low heat losses • Tripping classes greater than Class 10 • Precise and extremely long-time sta- ble tripping characteristic curves The benefits of the PKE can be imple- mented in the motor-protective circuit- breaker even more efficiently by the modular design. The PKE has versatile, approved accessories available from the PKZM0 system for safe and rational control panel construction. An interface to SmartWire-DT also incorporates the option for integration into the world of automation. • Reduction of the number of variants with its wide adjustment ranges: simplifies product selection, reduces

J B Switchgear Solutions was recently awarded a contract by DRA Global for the design, manufacture and supply of containerised motor control centres destined for an upgrade project at Rosh Pinah Zinc in Namibia. The multi-million Rand contract includes JB Switchgear’s specially-developed and compact ‘Eagle’ series container panel which allows two rows of motor control on opposite sides of the container whilst still maintaining the minimum measurement of 1.2 m (as specified in the Mines Health and Safety Act) between the opposing fronts of the motor control centres. The design’s advantages include space saving, cost savings, and the benefit of full functional testing before the container substation is dispatched to site. Busbars are easily accessible for installation, maintenance and subsequent additions and/or modifications. JB Switchgear’s ‘Eagle’ series carries a comprehensive type test certification and has proven to be reliable, robust and user- friendly. More than 31 000 tiers of this design have been installed in various countries around the globe. The mining sector into Africa has proven to be a very successful deployment focus for containerised substations and is expected to grow even further in the future. In this particular case, there are a large number of direct-on-line starters and variable speed drives ranging from 0.1 kW to 90 kW.

• Control relays • TVSS devices • Lighting panelboards

• Distribution panelboards • Distribution transformers • GE power management control systems • Equipment ground fault protection • Spectra RMS circuit breakers

Enquiries: www.geindustrial.com

Enquiries: +27 (0)11 027 5804

Enquiries: www.eaton.co.za

SPARKS ELECTRICAL NEWS

AUGUST 2017