Schaffner is the international leader in the fields of electromagnetic compatibility and power quality and supports with its components solutions for an efficient and reliable use of electric energy. With its products and services, the Schaffner Group plays a key role in promoting technologies that support renewable energies, ensures the reliable functioning of electronic equipment and systems in compliance with all major quality and performance standards and meets the requirements for greater energy efficiency.

EMC Filters available at Westek

Westek Electronics is dedicated to the supply of high quality products and solutions and provide EMC filters from Schaffner to our Australian customers. We have a wide variety of EMC filters available:

• Single phase EMC Filter

• Three phase EMC Filter

• Open frame EMC Filter

Single Phase EMC/EMI Filters for chassis or DIN-rail mounting are key for EMC compliance of higher power office equipment and low to medium power industrial applications.

Three Phase EMC/EMI filters solutions are suitable for industrial applications like motor drives and machine tools. Furthermore, these types of EMC/EMI filters are also suitable for mainframe computer systems, large uninterrupted power supplies, medical equipment, wind turbine power stations and a vast array of other three-phase power electronics.

Open Frame EMC/EMI filters must often be installed in an electrical or electronic device or case together with other electrical components. As attention is paid to the smallest possible size, there is often insufficient space to integrate standard chassis filters. For this purpose, Schaffner can design internal filters according to your requirements.

Download the Schaffner Catalogue here for more information and product details.

To enquire about our range of Schaffner EMC Filters, please fill out our online contact form or call us on 03 9464 1300.

The post Increase Energy Efficiency With EMC Filters first appeared on Westek Electronics.

We take great pride in working with some of the world leaders in the industry.

Some of our major suppliers such as Schaffner, MTE and TESEQ, are all determined to provide nothing but the highest quality equipment, and are exceptionally committed to their customers. These companies contributes not only to the industry, but to the environment by working towards energy efficient solutions.

We supply power quality equipment from Schaffner, an international leader in the fields of electromagnetic compatibility and power quality and supports with its components solutions for an efficient and reliable use of electric energy. Schaffner leads the way toward greater energy efficiency and promoting technologies that support renewable energies. We supply power quality equipment from Schaffner, and we are confident that you will find a solution that will fit your requirements.

The Schaffner Group offers its expertise and services worldwide in the fields of development consultancy, EMC solutions, application support and production.

Another one of our major suppliers MTE, offer power quality and filter products for both input (line-side) and output (load-side) of variable frequency drives (VFDs) and power conversion equipment. MTE provides complete power quality solutions for automation in oil and gas, water/wastewater, HVAC and other industries. MTE strives to become a Global Market Leader of Power Quality solutions for drives and motor systems.

We are proud to offer EMC test systems from TESEQ, a company which strives to offer the most comprehensive range of EMC test systems for immunity and emission testing. They take pride in their world class research and development program, which makes them an industry leader.

“Our unique “modular” approach to EMC is focused on our customers’ business needs. By breaking down the barriers between traditionally separate test functions we can optimize the test process to help you bring products to market more quickly”, TESEQ states on their website.

To see our product range from these major suppliers, please contact us through our online form or refer to our website.

The post Westek and Our Suppliers first appeared on Westek Electronics.

Würth Elektronik is an innovative company and always strives to provide complete solutions to help customers to understand new technology in an easy way.

In May this year they became a full member of the Wireless Power Consortium (WPC), a consortium which brings together 210 technology companies from all over the worlds to work on a pioneering charging technology.

Würth Elektronik is part of this innovative and global network, and was one of the first component manufacturers to develop coils both for transmitters and for receivers.

Würth Elektronik can now continue its research and role as industry leader in the field of inductive component solutions for wireless power transfer.

Wireless Power transfer is one of the fastest growing technologies. It is finding the way in markets such as consumer, industrial, medical, automotive, and furniture.

There are three main standards: Wireless Power Consortium (WPC) commonly known as “Qi”, Alliance for Wireless Power (A4WP) and Power Matters Alliance (PMA). Würth Elektronik is member of WPC and A4WP.

“Our aim is to position ourselves in the wireless power market, which has strong growth potential, so that we can develop our lead over the competition”, one of Würth Elektronik site managers, Oliver Opitz, says.

Westek is proud to have Würth Elektronik as one of our suppliers. Great innovations and forward thinking are always valued traits in the industry.

For more information about our range from Würth Elektronik, please contact us today or enquire through our online form.

The post Wireless Power Transfer – The Future of Electronics first appeared on Westek Electronics.

The use of test equipment helps maintaining the proper function and efficiency of equipment and tools, and also ensures that machinery and tools meet certification standards in order for a company to remain in business.

It’s important to evaluate your processes to ensure your measurement practices provide the greatest results. Benchmarking is a good way to ensure your practises are optimal, through gathering and comparing data and comparing it to an accepted standard, or to future conditions. By ensuring the test equipment is of high quality, you can be confident higher standards are being upheld. Having the right test equipment will facilitate your benchmarking, and make it easier to evaluate other aspects of the testing procedures.

Another factor that needs to be taken into account is the appropriateness of your test equipment. If you don’t have the right equipment suited your needs, you cannot expect to achieve the desired results. The selected equipment need to meet the measurement requirements of the process, not only on the day it’s delivered new, but also for the time between calibrations. It is therefore critical to gather all information regarding an instrument before approving it for a process. Our team at Westek is happy to provide advice and make recommendations based on your needs and our product range.

Our test equipment division offers quality test instrumentation, such as AC and DC power supplies, EMI/EMC test equipment, power and energy analysers, electrical engineering test equipment, bench top test and measurement, and hand held test equipment. We supply from industry leading companies such as Sorensen, Elgar, TESEQ and Frankonia.

Please view our test equipment products today and enquire through our online enquiry form for a commitment free quote.

The post The Importance of High Quality Test Equipment first appeared on Westek Electronics.

DC-DC Converter

The new Powerstax ND0111 DC to DC converter is suited to a wide range of tasks and in particular for rolling stock, providing full isolation for primary as well as secondary from ground.
The Powerstax ND0111 provides 12 volt DC output for a range of input voltages from 30 to 120 volt DC, and with a very high efficiency of typically 90%.
Convection cooling applies for a 90 watt continuous rating and fan cooling for the 110 watt rating.
The Powerstax ND0111 DC to DC converters are characterised by a very compact footprint 2” x 5” (50.8 mm x 127 mm).
Reversed input protection and low inrush current provide a high degree of ruggedness.
The Powerstax ND0111 meets EN501555, EN60950-1, and EN55022, as well as safety standards UL/EN/IEC60601, and IEC60571.
Voltage isolation is up to 1500 volts rms on both input and output, and 500 volts DC to ground on both input and output.
Protection features include overload and short circuit (hiccup mode with auto recovery). For further information, please contact us on 1800WESTEK or click on the link below to lodge an enquiry.

The post New DC-DC Converter from Powerstax first appeared on Westek Electronics.

The results of not assessing loads correctly can be very costly to the contractor required to bear the cost for correcting the harmonics contribution, generally to comply with AS/NZS point of common coupling (pcc) harmonic voltage distortion limits.

Contractors involved with commercial installations have to deal with the harmonics contribution of mechanical services, lighting, and IT equipment. All too often the mechanical services switchboard is a given, and the contractor is required to incorporate harmonic mitigation for the whole installation. And – surprise, surprise – the power authority comes along and fails the installation because the mechanical services side has insufficient or no mitigation.

For industrial installations, there are often further issues: inter-harmonics caused by heavy loads switching in, burst and phasefired power control (gluing, moulding, heat treatment, etc), highly variable harmonic contributions from welders, CNCs, etc. As always, the devil is in the detail. It is critical to do a take-out, and getting it right, first off involves good estimation of harmonic loads (electronic ballasts, magnetic ballasts, “guesstimation” of likely of personal computer loads), and making sure that harmonic loads for mechanical services, etc. are taken account of and mitigated at their own switchboards. For commercial installations this might be simpler than for a large manufacturing plant. The scope of this article is limited, but software is available to help out (see Fig. 1)

Figure 1 – In planning harmonic mitigation, predictive software is of great value. In this case, a large industrial installation is ‘mapped out’ prior to size selection of the active filters to be employed.

For many installations, a combination of active and passive filters is generally the solution. Passive filters are good for steady loads, but if required on cycling loads (eg inverter driven chillers, cool room compressors and fans etc) they need to be able to handle the variation in harmonic content (see Fig. 2). Large capacity chillers were driven by 12-pulse or even 18-pulse drives but this sort of complexity can be entirely avoided by the right choice of filter. In Figure 2, the mauve coloured line graph indicates a performance (5 per cent THID) equivalent to a 12-pulse drive.

Figure 2 – The graph shows the kind of performance (mauve coloured) that a good passive filter should be capable of. The Matrix AP filter is suitable for use with standby generators – many filters have leading power factor problems.

For installations incorporating server rooms and other large IT equipment, passive filters should be chosen with an eye to their behaviour when operating with a standby generator. Leading power factor due to capacitor filtering elements should be avoided. The response of the filter in Figure 2 can be adjusted and also works well with a standby generator.

A combination of passive and active harmonic filters in large commercial buildings usually provides, if intelligently planned, a satisfactory outcome. The benefits are both now and in the future. For most installations, whether commercial or industrial, the main switchboard is the often the most sensible location for the active filtering, although from a minimum conductor energy loss aspect, filtering is best done as close to the loads as possible. However, sensible wiring schemes including separate circuit neutrals can compensate a great deal, and any increase in copper cost can be offset by the avoidance of filtering, for example at the sub-distribution boards.

Active filtering at the switchboard improves power factor, and therefore provides futureproofing in that expansion of the electrical reticulation does not have to involve upgrades. It is remarkable how many switchboards operate with doors open, and fans blowing into them in an effort to prevent excessive temperature – all caused by harmonics. The prediction of additional harmonic load current in new installati ons is generally done badly. Engineering specifications are oft en deficient and are likely to devolve the responsibility onto the electrical contractor for harmonic mitigati on ass ess ment, costing and installation. Additionally, depending on the choice of active filter, displacement power factor can also be corrected as well as phase balancing.

The use of three-level inverter active filters and adaptive-passive harmonic filters (avoidance of leading power factor) are central to effective harmonics mitigation. As is explained further on, the active filter technology provides effective harmonics mitigation under very high peak current conditions, something that is often not sufficiently taken into account.

A feature of three-level inverter technology is the ability to faithfully mimic the load current. This is particularly important when inter-harmonics, commutation and flicker noise are resent – and when is that not the case? The pretty pictures of harmonics in brochures and text books don’t occur in real life. The response time of an active filter and the voltage level of the DC link are therefore very important. Basically an active filter is an inverter fed by a DC link. In order to provide proper functioning when high peak currents are involved, the DC link must be able to
accommodate these. Instead of thinking in terms of a fundamental with sinusoidal harmonics superimposed, think of the timelapse picture of load current, and what happens when there are large inrush currents involved such as large magnetising currents drawn by switched transformer loads and motors.

Apart from the individual rms current contributions of the third, fifth and seventh and higher harmonics, the inter-harmonics caused by frequently switched loads, etc. Harmonics make for a lot of rubbish riding on top of the useful fundamental rms current. Response time in active filters is critical in dealing with the totality of everything that isn’t the fundamental current.

Hardware selection has to be governed by practicality. The active filters selected ought to be modular so that expansion is easy. Housing at least to IP 54 standards is also important because switchboards generally do not have spare room or whatever is provided over and above switchgear and metering is taken up with capacitor banks for displacement power factor correction. Modularity is key because whatever the design considerations indicated, the proof of the pudding is in the eating – and it would be too bad if it turns out a new frame size is needed to accommodate unplanned harmonic levels.

For further information, please contact us.

The post Harmonics will cost you money unless you plan for them first appeared on Westek Electronics.

• Uses fewer capacitors while maintaining 99%+ efficiency, only one capacitor up to 103 Amps
• Compatible with generator systems
• No resistors required
• Generates less heat / no fans required
• More consistent power factor across the load range
• Improves C/L ratio which decreases potential resonance
• Reduces energy costs
• Lowers capacitance resulting in less voltage rise at no load, at PCC (Point of Common Coupling) and on the DC Bus
• Extends service life of electrical equipment
• Helps eliminate system downtime
• Helps meet IEEE-519 Requirements (5% THID) when used at lighter loads
• Guarantees THID performance of 8% MAX at 30% load, 5% MAX at full load

For further information, please contact us.

The post Adaptive-Passive Harmonics Filters by Westek Electronics first appeared on Westek Electronics.

Soft supply–problematic tap changing in distribution transformers

The TSi voltage regulators should be used in areas of soft (high impedance) supply systems and also in areas where distribution transformer tap changers cannot keep up with the voltage regulation due to peaking demand. Therefore the voltage regulators find application both in rural as well as in metropolitan regions. Under-voltage sags and over-voltage swells are often harmful. Over-voltage can cause burn out (a 10% increase in voltage can cause a 21% increase in power). Under-voltage can cause loss of torque (a 10% decrease can drop motor torque 19%).

Rural areas-SWER supply systems

In many rural areas supply is via single wire earth return (SWER). The SWER supply system can be subject to large voltage regulation. Voltage sags are due to the relatively high line impedance (compared to metropolitan supplies). Voltage swells can be due to the Ferranti effect. The line is then affected when lightly loaded by its capacitance to earth. Large voltage swings that can result in SWER supplies can cause serious damage to motors.

Protection of motors against brown-outs

As to motor damage, take the example of a motor driving a high inertia load. A large voltage drop might cause the motor control contactor to drop out. When voltage comes back after a brief sag, the rotor is still spinning and not necessarily much below synchronous speed. The combination of the rotor back-emf working against the supply voltage, the two no longer in phase, can cause a catastrophic motor failure, damaging its insulation beyond repair.

UPS system reliability

Mission-critical loads are usually supplied by UPS systems. The double conversion on-line UPS is generally used for ratings higher than 10 kVA. Although a sophisticated technology capable of delivering high power quality output voltage, it is subject to the effects of voltage regulation on the input. Large sags will bring on the battery bank but smaller voltage drops depending on their duration, may do the same, and therefore, almost surreptitiously, lower the amp-hour capacity of the battery bank.

Auxiliary generators, etc

Generator supplied loads, therefore including those backed up by an auxiliary generator, may well require a voltage regulator. The relatively high sub-transient reactance of generator windings are much affected by poor power factor. Therefore loads sharing circuits with heavy electrical gear such as large motors, may well need their own voltage regulator.

TSi Technology

The TSi technology is based on an IGBT converter-inverter operating on a in-line, buck-boost transformer. There are two powerstacks, one being the converter supplying DC to the inverter which provides correcting AC voltage to the buck-boost winding. A microprocessor circuit compares the output voltage against an internal reference, and alters the pulse width modulation to the inverter. The TSi VRP voltage regulators include surge protection on the input side and have noise reduction input and regulated output filters.

The TSi technology compare very favourably with servo voltage regulators (these typically have a response time of 200 milliseconds) and electronic tap changers, which have settling times of the order of 50 milliseconds. TSi VRP voltage regulators have a response time of 20 milliseconds.

Wide range of ratings

The TSi VRP voltage regulators cover ratings from 1 kW, single phase to 50 kW, three phase. Features include automatic bypass in the unlikely event of equipment failure, low insertion impedance, low weight per kW rating because of judicious selection of magnetic components, caster mounting and low emitted noise.

TSi VRP voltage regulators in brief
The TSi VRP precision voltage regulators are designed for indoor use and suit applications including mobile phone cells, microwave relaying stations, remote telemetry, etc. and a variety of other industrial and commercial as well as scientific duties. The VRP microprocessor-based voltage regulators employ IGBT-based 20 kHz PWM-converter-inverters and buck-boost transformer to provide very low distortion precision-regulated voltage with less than 3% variation as well as very fast response to step changes within 20 milliseconds. An automatic bypass provides assurance that in the unlikely event of equipment failure, voltage for mission critical applications is still being supplied. The VRp voltage regulators are designed to meet IEC60950 and to provide excellent surge protection. In addition a noise filter is provided for the regulated output. For further information, please contact us.

The post TSi AC Voltage Regulators first appeared on Westek Electronics.

The PMM 9010F fast, digital EMI receiver provides gapless conducted interference measurement from 10 Hz to 30 MHz in full compliance with CISPR 16-1-1. The receiver can be upgraded to 30 MHz – 3 GHz; 30 MHz – 6 GHz; and 6 – 18 GHz, providing a long-term investment value.

The PMM 9010F fast, digital EMI receiver with FFT reduces full compliance testing significantly from the traditional hours involved, scanning the conducted spectrum under 25 seconds with a hold time of only one second for CISPR detectors including Q-Peak, C-RMS, and C-Avg (utilising an effective ¼ resolution bandwidth step). The PMM 9010F EMI receiver is equipped with Peak, Quasi-Peak, RMS, RMS-avg, and C-avg detectors.

The PMM 9010F receiver has a high contrast, backlit display with a large range of display units to choose from. Built-in display limits include CISPR 11, 14, and 22 limits, and also shows battery status. The I/O interfaces include RS232, USB, high speed optical, and a user port driving accessories.

Important options available for the PMM 9010F fast, digital EMI receiver with FFT include MIL-STD-441 resolution bandwidth filters, a full-compliance, click analyser function (to CISPR 14-1), and a RS232 to BlueTooth converter.

The PMM 9010F fast, digital EMI receiver with FFT advanced design confers a very low noise floor, eg:-7dB?V in the A band (9 – 150 kHz) and 5dB?V in the B band (0.15 – 30 MHz). When higher sensitivity is required, the noise floor can be reduced to –24dBmV in the A band, and –7dBmV in the B band.

PMM’s software package (PES) is suitable for real-time analysis, saving, recalling, editing settings, limits, scans, etc. The software also drives ancillaries such as PMM’s LISN and RF switches.

Ancillary equipment includes a 3-axis loop antenna suitable for CISPR 15 (EN551015), rod antenna (9-30 kHz), bi-conical antenna (30 – 200 MHz), and double-ridged antenna (6 – 18 GHz), and an extensive range of LISNs for single phase and three-phase supplies.

For further information, please contact us.

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