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Dr.InPhase Edu Series – Video Tutorial on using Fluke 435 For Power Quality Measurement

Dear All,

Fluke 435 InPhase TutorialFurther to the overwhelming response to our tutorial on using Fluke 434 for Power Quality measurements we have now launched a new video tutorial. What is so special is that I have roped in Mr.Hasan Mydin a top notch power quality expert in the world. It is a twenty minute tutorial that outlines that covers end to end on the usage of Fluke for Power Quality measurement.

Topics Covered

  1. How to setup Fluke Meter
  2. Different configurations in which measurements can be obtained.
  3. Measurement topology
  4. Handling different site conditions
  5. User interface of Fluke 435
  6. Detail explanation on Operations of the meter

If you have not read our step by step tutorial on Fluke 434 Series for Power Quality. Please check it here. How to Use Fluke 434 For Power Quality measurement

Please do share your feed back after watching this video.

Happy learning and catch you soon with more news about Power Quality and much more.

Thanks for reading…if you have questions don’t forget to ask me. You could write to me to or call +919632421402

IInphaseLogo(300dpi) (1)nPhase Power is a Power Electronic Product company manufacturing products for Power Quality and Power Conversion. InPhase is manufacturer of Active Filter, Active Harmonic Filter, Solar Inverter. InPhase majors in power system design for power quality and conversion. Driven by a management that has a combined experience of over 60 years in power system and power electronics InPhase nurtures innovation and passion in this field.

InPhase Power Welcomes Kabali – Calls it a day off

Well, the Kabali fever is catching up fast.. Surprisingly many of our employees have started piling up request for a leave on the release of Kabali. So InPhase Power has decided to call it a day. Wait….Wait…Wait…It doesn’t stop there InPhase Power has also made it easy for our team to catch up Kabali by offering free tickets..


Here is the notice informing our employees on the arrangement

Kabali InPhase Notice

InPhaser’s enjoy Thalaivar on Screen

Note: For InPhase Customer comes first. The above statement will not affect our ongoing operations and any emergency support requested by our customers.

Team InPhase


Dr.InPhase Reading
Dear Readers, InPhase recently participated in India’s premiere event for Power Quality “CAPCIT2014“.(You can read more about it here). This blog is to share the abstract of the paper that we presented at CAPACIT2014. If you are interested in receiving the full version of this paper please email to info[@]






Natesh Mayavel, InPhase
Panna Lal Biswas, InPhase
Thiyaneswar MS, Inphase


Consumer electronics, Data Centers, HVAC systems and a large range of industrial applications, namely power electronics based, can cause high disturbances into the supplied electricity. The disturbances comprise of harmonic current generated by such loads, and the voltage distortion created by the harmonic currents. The main problem with the harmonic currents is that, they can cause overheating in the local supply distribution transformer and in the installation itself. Indian Electric utility companies are starting to be more concerned about harmonics in the transmission and distribution network, and imposing strict harmonic limits on consumers. Active harmonic filter is a potential solution to mitigate harmonics problems. The usage of active harmonic filter is expected to increase drastically in Indian industries, to meet utility requirements. This paper discusses technology variants of Active Harmonic Filter from different aspects, and their advantages and disadvantages.

Active harmonic filter; STATCOM; Active filter technology; Power quality; Harmonic currents; Voltage distortion; Electrical installations;

InPhase Active Harmonic Filter Technology Review

InPhase Active Harmonic Filter Technology Review

1. Introduction
2. Active Harmonic Filter Principle
3. Active Harmonic Filter in Electric Network
4. Technology Review
4.1 Control System Schemes
4.2 Control Mode
4.3 Speed of Response
4.4 Unbalance in Harmonics
4.5 Power Hardware
4.6 Input passive network
4.7 STATCOM Vs Active Harmonic Filter
4.8 Networking
5.0 Conclusion

If you are a Power Quality or Active Harmonic Filter enthusiast please contact us today at info[@] to receive the full copy of this paper.

Meet you again with a interesting read. until then bye bye!! from Dr.InPhase Power. Your Power Quality Partner.

Doctor welcome

At InPhase Power we are very serious about improving the power quality of the nation. Our products provide unmatched improvement in Power Quality by effectively curbing harmonics and maintaining steady power factor. Explore our Products Active Harmonic Filter(IPC150-AHF) and STATCOM (IPC150-SCOM) to find how they can improve your power quality.

How TNEB regulatory commission Tangedco determines Power Quality and harmonics

Doctor_Character-04-CompTANGEDCO the Tamilnadu regulatory commission for Electricity is the forerunner in power quality for Industries by setting a Harmonic limit and consequently a penalty for the same when exceeded. This initiative is the first in the country and many other states are sure to follow it.  Refer here on the tariff rates for Harmonics by TANGEDCO 

FLUKE the measurement meter companyof choice by TNEB for measuring Power Quality and harmonics has recently published about this in its international blog and covering how the TNEB audit is carried out. It is also worth to note that TNEB has purchased over 42 meters (Fluke 435 Series II Power Quality and Energy analyzer)  from Fluke to carry out this energy audit.

How TNEB measures / determines Power Quality and Harmonics at your site ?

Instrument to use: Instrument complying with Class A per IEC 61000-4-30

Measuring Point: At point of common coupling (PCC)

Measurement Cycle: Two operating cycles with large non-linear loads into operations; if continuous process then eight hours

Measurement Value: Ten minutes average values of THD for voltage; TDD for current and individual harmonics for voltage

Loading condition: 75 percent or higher than the last 12-month average load

Harmonic Limits: 98 percentile value needs to be less than 5 percent for voltage THD, 3 percent for individual harmonics, and 8 percent for current TDD

Fluke 435

InPhase_Doctor_Character-XrayAt InPhase we use Fluke 435 Series II Power Quality and Energy analyzer to carry out energy audits and have the tools to give you the Power Quality report in the shortest time.  It doesn’t end there but it just starts, with a whole range of Power Quality solutions in our product range like Active Harmonic Filter, STATCOM, APFC Panels, Detuned Filters, Line reactors we will give you the best and cost effective solution of choice to meet your power quality needs.

Contact our team today by dropping a mail at info[@] or call us at +919632421402


Article originally appeared in: Fluke US Blog

Dr.InPhase Edu Series – Active Harmonic Filter

Howdy!! Everyone

Active Harmonic Filter Education seriesIt is Dr.InPhase Power again. Our today’s edu series will focus on educating our readers better about Active Harmonic Filter. Our team has taken efforts to list down the 16 mostly asked question about Active Harmonic filter and the corresponding answers. I hope it gives you better understanding of harmonic filters. Should you have more questions we are happy to answer it mail us to info[@] I will be happy to answer.


  1. What are harmonics?

In an electrical circuit, when a fundamental AC sine wave gets distorted, it causes additional frequency which are integer multiple of fundamental frequency. As per Indian standards, fundamental frequency is 50Hz. So the frequency of the harmonics are as follows 150Hz (3rd order), 250Hz (5th order) and so on.

  1. Effects of Harmonics
  • Conductor over heating
  • Overload and premature ageing of Power Factor Correction capacitors
  • False or spurious operations of fuses and circuit breakers
  • Increase in iron and copper losses or eddy current due to stray flux losses at transformers
  • Operation instability at generators
  • Energy meters may record incorrectly resulting in excess billing to customers
  • Computer and its peripherals may experience interference or failure
  1. Which order harmonics has to be mitigated and monitored?

The most significant harmonic orders in three-phase distribution networks are the odd orders (3, 5, 7, 9, 11, 13 ….)
Triple-n harmonics (order multiple of 3) are present only in three-phase, four-wire systems, when single phase loads are connected between phase and neutral.
Utilities are mainly focusing on low harmonic orders (5, 7, 11, and 13).Generally speaking, harmonic conditioning of the lowest orders (up to 13) is sufficient. More comprehensive conditioning takes into account harmonic orders up to 25.Harmonic amplitudes normally decrease as the frequency increases. Sufficiently accurate measurements are obtained by measuring harmonics up to order 30.

  1. What are the different harmonic mitigation techniques?
    • Isolation transformers
    • Line reactors
    • Harmonic filters (Active harmonic filter and Passive harmonic filters)
  1. What is a  Active Harmonic Filter / Passive Filter? 

Passive Filters:
Based on the harmonic analysis or report.  A LC circuit is tuned and connected parallel to each non-linear loads to remove the respective harmonic orders. Thus preventing the harmonics to flow in the distribution network

Active Filters:
Power electronic conditioners are connected across each non-linear loads that produces harmonics. This filters injects in opposite phase the harmonics drawn by the non-linear loads resulting in pure sinusoidal current.

  1. Why active harmonic filter are preferred instead of passive filter
  • Active Harmonic Filter analyses the load by itself and one need not know the harmonic in the load as in case of passive harmonic filter.
  • Active Harmonic Filter is immune to the main frequency variation whereas the passive harmonic filter is very much sensitive to the frequency of the mains power.
  • Active Harmonic Filter can take care of the changes in the non-linearity of the load current whereas Passive Harmonic Filter can’t take care of the changes in the load current pattern.
  • Active Harmonic Filter can filter the harmonics up to 31st harmonic. The Passive Harmonic Filter is very difficult to tune as the harmonics beyond 11th. And it is ineffective in case of harmonics beyond 11th harmonic.
  1. A) How to detect harmonics in the electrical system

Occurrences like flickering of lights, alarms going off, or MCB’s, MCCB’s, RCD’s and Earth Leakage devices tripping for no apparent reason.

Cables getting hot, hot switchboards or overheating motors. Replacing motor’s bearings & insulation often is a strong indication of the presence of harmonics.

  1. B) What are the essential indicators of harmonic distortion and measurement principles?

Power Factor, Crest Factor, Harmonic spectrum and R.M.S

  1. Do Active power filter help in improving the power factor?

Real power is used to perform real work, but Inductive loads require Real and Reactive power of their operation. Utilities provide apparent power (Apparent Power = Real Power + Reactive Power) Reactive power performs no work. However, the flow of reactive current, a component of reactive power, does consume energy as it passes through resistive elements of the power system, thus reducing overall system efficiency. This reactive power is used to generate magnetic fields within motors, transformers, and other magnetic devices. Reactive power, combined with harmonic currents, contribute to poor power factor in electrical systems. The capacitors inherent in harmonic filters design, supply the necessary reactive power so the utility doesn’t have to. The reduction in harmonic currents further improves the ratio of active power to apparent power. This overall improvement to true power factor assists in the efficient operation of facilities and the avoidance of possible poor power factor.

  1. Why to improve Power Factor?
  • Reduction in cost of electricity
  • Reduction in cable size
  • Reduction in losses
  1. Can I use Active Harmonic Filter on multiple connected systems

Harmonic filters are designed to focus on drive-applied applications but can be sized for multiple motor systems as well. Caution must be taken to size the unit properly as well as to take all of the power system variables into consideration.

  1. Can I use Active Harmonic Filter when the loads are powered by the Generator?

You can use on generator power; however it is more critical to size the device properly. If the nonlinear load represents a great portion of the total generator load and the drive is very lightly loaded, the filter capacitance may cause the generator to experience voltage regulation issues. You may also contact the generator provider for their guidelines on the use of harmonic mitigation and capacitive equipment on their systems.

  1. Does Active harmonic filter available for 240V systems?

One can use a three phase reactor in a single phase circuit that will perform limited mitigation

  1. Why power factor analysis has to be done before installing capacitors?

Harmonic analysis has to be performed before installation of power factor improvement capacitor to ensure that resonance frequency (Harmonic Resonance) do  not correspond with prominent harmonics contained in current and voltage. It would affect / damage capacitor banks when offending frequency is large enough during resonant condition.There is high probability that other loads would also get damaged.

  1. Where to place the Active Harmonic Filter for harmonic mitigation?
    • At the load
    • At the transformer
    • At the primary distribution

The best place to remove harmonic currents is often at the nonlinear loads that generate harmonic currents or, alternately, at the sub-panels that supply the branch circuits. The object is to reduce harmonic current at a point that is as-close-as-possible to the harmonic generating nonlinear loads and also it depends on different applications. The reduction of harmonic current will result in the reduction of ‘penalty’ losses.

  1. What are the factors to consider when specifying an active harmonic filter?

Losses, harmonic compensation capacity, response speed, Inter harmonics, EMC, De-rating, physical footprint, modularity, commissioning software, HMI, Smart grid functionality, IP/NEMA class and water cooling, voltage

  1. What does K-Rating of a transformer mean?

K-Factor rating, applied to transformers, is an index of the transformer’s ability to supply harmonic content (%THDI) in its load current while operating within its temperature limits. K-Rated transformers are only intended to survive in a harmonic rich environment. They do not mitigate harmonic currents or voltages.

Meet you again with a interesting read. until then bye bye!! from Dr.InPhase Power. Your Power Quality Partner.Doctor welcome








At InPhase Power we are very serious about improving the power quality of the nation. Our products provide unmatched improvement in Power Quality by effectively curbing harmonics and maintaining steady power factor. Explore our Products Active Harmonic Filter(IPC150-AHF) and STATCOM (IPC150-SCOM) to find how they can improve your power quality.

Two reasons why “Make in India” is “Make My India” and Four ways SME’s can make it happen

Two reasons why “Make in India” is “Make My India” and Three ways to make it happen

Doctor Hi

Hello Readers, I’m Dr.InPhase again, here i bring on to our desk a important discussion on the recent make in India campaign. I hope you enjoy reading it.

Prime minister Narendra Modi’s “Make in India” campaign is a echelon call to the much needed revival of manufacturing sector in India. As a young and energetic manufacturing company InPhase truly reflects the ideology behind “Make in India”.Here are a few thoughts how we could “Make in India” campaign turns us in to the start-up nation.

Make In India

1.”Made in India” is “Made for world”

India has the most rugged test conditions, a product that is designed and developed for India meets global conditions much easily be it the rugged weather, harsh roads or fluctuating power Indian test conditions are unique and challenging. This is why GE’s through it’s reverse engineering t process makes devices for India and turns it in to a global product. At InPhase this enabled us to create products that work at high ambient temperatures and fluctuating power which means they perform much better and stable in western countries. So Make in India to Make for the world.

2. Manufacturing is a Ecosystem:

Manufacturing unlike IT service business will nurture a ecosystem. Every manufactured product requires a range of allied services like so when manufacturing and product needs like sub components, job work, distribution, channel etc. thrives it nurtures a ecosystem altogether, striking a stark contrast with IT services. Manufacturing getting better also uplifts a whole lot of other supporting business indirectly.

These are just two good reasons why “Make in India” when happening can be a big game changer than the IT revolution, coming down to a four ideas that worked for us as a SME and that could also work for others

Before kicking in it is important to clarify a huge misconception and  it is that “manufacturing is putting things together” leading to a a downside view of manufacturing. Yourstory the countries leading start-up magazine not having a single manufacturing start-up in its top 30 start-ups to watch is a indication of this claim. Here is what we think what it takes to change this culture,

1. Institutionalize R&D:

R&D has become a big misnomer in the manufacturing sector. Majority of the R&D set ups are used to run mundane customer projects rather working on what comes tomorrow. Industries lack ties with institutions,they choose to walk the time tested path of what they have been doing time to time again. Industries must deepen their ties with institution and in fact co-locate their R&D team in the institute. Innovation is about constantly being aware of what is changing around and how best you adopt to it. So the first step is to create a true R&D team that works like a institution but benefit the business.

2.Leverage IT services:

Manufacturing enterprises specially those in the SME bother a little about how IT can be a value addition. IT is not a mere thing to automate your finance or manufacturing process but can significantly by change the way you work and cut time when applied. At InPhase with simple automation like the power quality report we were able to cut down a task that took 5 man days every time to 30 minutes. This just didn’t reduce our work but also increased our throughput and capability to serve more customer.

3.Raise the quality keep the price:

Most Indian manufactures see dropping the price as the only means to win business against big giants overtime this makes requires use of sub stand quality products to keep the price lower and so declining performance. The alternate is to raise the quality while retaining the price. This really triggers the competition while keeping the business sustainable for longer run and also helps generating funds for the R&D investments.

4.Revice the startup culture:

Innovation must drive business and not just volumes. Only when innovation is a routine a organisation learns to sustain and expand. Go back to the roots of where your organisation come from,”the startup days”.Rekindle the feelings and ensure that they aren’t going away. embed it in culture.Even when you grow big its essential that you stay at heart like few people startup.

Let’s join hands to Make in India bigger success as “Make in India” will “Make My India”.

Doctor - Thumbs up


At InPhase Power we are very serious about improving the power quality of the nation. Our products provide unmatched improvement in Power Quality by effectively curbing harmonics and maintaining steady power factor. Explore our Products Active Harmonic Filter(IPC150-AHF) and STATCOM (IPC150-SCOM) to find how they can improve your power quality.

InPhase features in Asia Power Quality Initiative portal APQI

InPhase features in Asia Power Quality Initiative portal APQI

InPhase is constantly in an endeavour to offer the best of power quality to the nation and APQI is another such initiative that has been set up with the sole purpose of actively promoting Power Quality in India and the world. APQI jointly promoted by Leonarda energy and International Copper Association of India has been making many fruitful efforts in making the Indian industry power quality aware through webinars, articles, deep insights and statistics. Here is a recent couple of seminars that might be of interest to you on power quality

APQI – Power Quality and Industrial Benefits

Today in our effort to step up power quality we have our company featured in the APQI portal. This will help our products and solution reach broader customer base eventually leading to a better power quality. Thanks to APQI for considering to feature us in their portal.


Lots of interesting things have been happening recently with InPhase and power quality so I’ll meet you all soon again with more good news.

Until then bye and Happy Power Quality!! from Dr.InPhase Power

Doctor Hi

At InPhase Power we are very serious about improving the power quality of the nation. Our products provide unmatched improvement in Power Quality by effectively curbing harmonics and maintaining steady power factor. Explore our Products Active Harmonic Filter(IPC150-AHF) and STATCOM (IPC150-SCOM) to find how they can improve your power quality.