Specialists in high voltage harmonic mitigation

Ensuring adherence to strict power quality standards at the connection point to a wind farm consisting of more than 120 wind turbine generators, three 132 kV collector substations and transmission lines, and over 100 km of 33 kV cables, and delivering the necessary practical implementation requires the type of experience and specialist skills that NE are known for.

ONE performed detailed harmonic assessments, conceptual filter designs, rating calculations, specified, and then delivered and assisted with site installation and commissioning of two 132 kV 50 Mvar C-type harmonic filters at a large wind farm in Victoria. These filters are, at the date of publication, the largest and highest voltage C-type filters installed in Australia. 

Uninterrupted power quality

The Merus Uninterrupted Power Quality (UPQ) is an innovative concept, combining the functionalities of an active harmonic filter and a UPS into a single robust solution. UPQ protects mission critical processes from supply interruptions and voltage sags while maintaining supply voltage quality by compensating harmonic currents and the reactive power fluctuations of non-linear loads.

Merus UPQ has two operation modes. In secured supply conditions, it operates in power quality modes, performing active filtering of harmonic distortions as well as load balancing and flicker mitigation. When it detects a voltage sag or power outage in the supply network, it shifts to power protection mode to protect against critical loads. Merus UPQ is available from low up to medium voltage levels.

Statcom enables flexible grid connection for mine

We offer unmatched project time frames for statcom solutions. Optimised Network Equipment has proven performance in detailed system studies including harmonic impact studies, power quality analysis and fast transient network studies, and now we combine our skills with market leading solutions from Merus Power and our track record of delivering complete projects to all our customers in Australia and New Zealand. Solutions that are flexible enough to provide ultra-fast voltage support, balance network voltages, and act as a harmonic filter – all at the same time.

Read more in this application note about how we can improve overall power quality for our clients and the surrounding network.

Damped filter in a railway application

Mass rail transport systems in modern urban centres require reliable, safe, and high quality electrical energy. Urban rail systems include power supplies to rolling stock and to stations. Rolling stock is commonly supplied with direct current from rectifiers that generate significant harmonic distortion, and this distortion is distributed throughout the network. High voltage distortion can result in communication failures and malfunctioning electrical and electronic equipment, with consequent danger or inconvenience to passengers and rail personnel. High voltage distortion contribute to network losses and can also result in non-compliance with network supply arrangements and reduce equipment life.

This note describes an approach that ensures voltage distortion on sensitive loads is limited to within acceptable levels.

Choosing reactors for shunt capacitor banks

Shunt capacitor banks are installed for a variety of reasons in industrial, distribution and transmission systems. A common thread to all installations is the question of what, if any series reactor should be installed with the capacitor bank.

Series reactors are used with capacitor banks to limit the effect of transients during capacitor switching, and to control the natural frequency of the capacitor bank and system impedance to avoid resonance or to sink harmonic current.

Choosing between damping, detuning or tuning reactors in any capacitor application requires an understanding of the consequences of such a decision. This application note describes these consequences in the context of a practical example.

Visit our downloads area for much more information.

Reducing voltage sags during motor starting

Induction and synchronous motors draw starting current that is considerably more than nominal current. This can cause voltage sags that exceed permissible levels as determined by supply agreements, cause problems for equipment in the remainder of the plant, and in worst cases cause the motor to stall. Optimised Network Equipment can provide a solution based on rugged thyristor switched capacitor banks that has lower cost compared to other remedies such as variable speed drives, provides near full torque during starting and is very simple to install indoors or outdoors in a switchyard.

This example delivered by GE Grid Solutions to the Colonial Pipeline Company describes the typical problem, alternative remedies and a comparison of advantages and disadvantages for each. Refer to our downloads section for product information.

We can provide support in terms of dynamic system models that will identify potential starting voltage sages, quantify the problem and the details of the required solution. Please contact us for more information.

Application, design and protection of mechanically switched capacitors with damping networks

All our clients have access to the combination of excellent quality products backed by specialist local and international engineering skills to develop and deliver solutions at all levels of the energy business.

For example in this article design aspects of mechanically switched capacitors with damping networks (MSCDN), also called “C-type filters” are presented, with relevant information and recommendations regarding the specification and protection of the filter components. Innovative relaying schemes are presented to ensure reliability and sensitivity for internal faults on the components, in particular air-core reactors, in order to avoid major damage to them and allowing further analysis of the causes of faults.

The combination of our ability to model and understand your electricity network and the support of excellent engineering and production resources internationally provides our clients with un-equalled confidence in the solutions they implement. Contact us and experience it for yourself.

Specifying and designing medium voltage enclosed capacitor banks

We provide solutions based on strong technical merits and a professional approach to our business.  An example of our approach can be found in our solution for enclosed capacitor banks as described in this article. We understand that buyers, users and suppliers all have somewhat different histories and preferences, and we aim to provide a clear description of the most important things to look out for in the specification, procurement, design, manufacturing, delivery and operation of enclosed medium voltage capacitor banks. We would be delighted to discuss this in more detail with you.

Need active harmonic filters? We have the best.

What do you get when you combine the best performing active harmonic filter on the market with on-site evaluation and detailed application engineering support? The MaxSine Compact: it ticks all the boxes:

  • Modular design from 50 A to multiples of 100 A
  • Flexible mounting in OEM panels, wall or floor mounted cubicles
  • Several control options for fast and super fast (<1 ms) compensation
  • Neutral current compensation
  • Reactive power compensation
  • Powerful yet simple setup by means of web browser interface

Applications range from anywhere with electronic loads that are sensitive to power disturbances like hospitals and office blocks, to any fast changing linear or non-linear load.

Optimised Network Equipment has the necessary measurement equipment to evaluate your requirements on site, and can carry out efficient studies to confirm your exact requirements for harmonic filtering – active or passive – no matter what your location or application.