Power Quality

Power Quality,

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Power Quality (PQ) problem is “Any voltage, current, or frequency deviations that result in failure or deficient operation of the equipments primarily designed to consume or supply clean Power.” PQ issues are relatively new, as more and more non-linear loads and energy savings equipments are being used, more prevalent are these issues. It is only recently that the electrical engineers has had to deal with the analysis, diagnosis and solution of PQ problems. Evenif it has not become a major topic in the industry,engineers are being confrontedwithPQ issues on a daily basis. The problems related to PQ are often difficult to solve, and may allow different solutions, so the choice is not always simple for those engineers and professionals who are involved in this subject. The main reason is probably due to the fact that PQ is a complex area covering many different topics. The optimal solution to a PQ problem is usually a mix of solutions fora specific situation. In such a situation, it is necessary to identify that problem and proposedifferent solutions to allow the technicians to make the optimal choice.Evaluation of solutions is probably the key element in PQ problem solving, chieflyfor economic reasons. Our Solutions backed by equipment and engineering support from Electronicon Kondensatoren GmbH , System Electric GmbHand Janitza Electronics GmbHall German companies are up-to-date and at par with the solutions now being offered elsewhere. Our approach to Power Quality has four main pillars as shown below

Why is it necessary to have Power Quality Monitoring System? It is very important to note that a typical power system including generators, loads and coupling inductances is a single integrated and dynamic system- any change in voltage, current, impedance etc. at one point immediately brings about a change in every other point in the system. The industrial facilities are also very dynamic in nature, with new machines, technologies, changes in neighboring industries changes in the State Utility system, all cause different responses. Power Quality Phenomena thus resulting can be short time like transients or slightly longer duration like voltage outages. Therefore, it is extremely important to have a continuous recording of the Power Quality parameters so that all the events are registered and therefore analyzed. Finally, it is also very pertinent to have all the devices monitoring power quality be time synchronized. This is so that we can track the origination of the problem and also map the impact of the problem. This enables installation of appropriate solutions/management of the problems.

Integrating Power Quality and Energy Management Janitza Power Quality Monitors are not just Power Quality Monitors. These are devices that bring local Intelligence to the system. With different I/O possibilities and PLC like features using its programming language, different parameters of energy consumption can be monitored, controlled, calculated and then pre-programmed actions initiated. Actions include switching on/off devices, emails alerts, SMS etc. For example in the in the above graphic the connectivity with temperature, Steam; Flow of fluids; energy counts, light etc. is depicted. It is also possible to connect to other PLCs and have additional features built in the system. To illustrate further- in a factory with several furnaces a rise of temperature beyond a defined value can be indicative of leakage of heat, similarly for steam, HVAC systems. Or change in air pressure or vacuum can also signify leakage. Power Quality monitoring on the other hand ensures that the equipment has power quality within the specified levels of immunity. If the Power Quality is poor it is likely to deteriorate the life of the equipments which leads to Capital Expenditures (replacement of Equipment) and Operational Expenditures (replacement of Fuses, cables, connectors ...). Reactive Power Management solutions (Power Factor Correction; Passive Filtering) reduce the heat losses in the net and reduce the distortion (harmonics, notches) of the voltage and current, as a result there is reduction in electricity bill and improves performance of the system.

Typical Measuring Levels The PQ monitoring is built in a hierarchical structure. An example is shown below

With such a structure two important objectives are achieved- 1. Complete transperncy in the electrical system 2. The system can be built slowly and expanded with time

PQ Solutions LV MV

System Electric was founded in 1975 and is a well known expert in the field of Reactive Power management and Harmonic filtering. The modular solutions developed by them in 1970s are still very popular and have become a global standard. We are offering in India our APFC, Dynamic-APFC for fast switching applications, Detuned and Tuned Harmonic filter solutions, both in standalone as well as in modular construction.