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DFR: The New Standard in Transformer Testing

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We all know the single most effective way to prevent power failures and shortened equipment lifespan is by keeping moisture to a minimum, along with heat and oxygen. It's fair to say that most equipment failure and subsequent losses (time, resources, etc) could be mitigated, through routine insulation testing. 

When it comes to improving testing standards, the process is often long and expensive. Because of this, many industry players focus on improving test and measure equipment, which means we have very advanced tools that can often be let down by outdated regulations.

It also means when we do see updates to international standards, it's a very good thing and often welcome. One example is the adoption of DFR (Dielectric Frequency Testing) over traditional PF (Power Factor) and DF (Dissipation Factor), over 25 years after it was first introduced.

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Getting To Know Electric Vehicles: Charging | Connector Modes

Charging Electric Vehicles

As environmental awareness drives technology to new heights, the electricity industry is seeing its fair share of the disruption. Electric Vehicles are just one of the rising technologies that we need to adopt, yet it is one of the most pressing. For the purposes of this blog, when we say EV we mean a fully electric vehicle, not a hybrid of any sort.

Over the next few months we'll look at the different aspects of EVs, starting with the first one most of us will come across: Charging.

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Trends Using Industry Knowledge to Improve Your Business

Jan18 Trends

TL;DR: Equipment, legislation, knowledge, technology: these cornerstones to your income must be up-to-date and future ready. Are they? How much time do you spend on keeping up to date with current industry trends? Find out how to keep updated, what to ignore and when to make changes to your business based on what you learn.

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Time to Throw on the Summer PPE Gear

AVO Blog DEC18 01

While most of us (the ones who met their targets) will be taking a week or so to unwind and mentally prep for the new year. Those of us who didn’t get into Santas good books have been put on the skeleton shifts, to make sure the building doesn’t burn down and to keep the servicing up.

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Electric and hybrid vehicles are on the way

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Megger has you covered!

Electric and Hybrid Vehicles need a special testing regine 2Good news for the environment, but it does create challenges for garages and service agents. Now having to deal with electrical systems that work at much higher voltages than those found on traditional vehicles. One important consequence is that, in order to ensure safety and reliability, insulation testing will be a prime requirement.

 

MIT400 2Meggers new MIT400/2 series of Insulation resistance testers are the perfect solution:

  • MIT400/2 – 1000V Insulation test, CATIV Safety
  • MIT410/2 – As above but including PI/DAR/Timed testing
  • MIT420/2 – As above but including results storage
  • MIT430/2 – As above but including Bluetooth results download

Download Brochure ...

 

Q and A - high voltage circuit breakers

Q; What is the first trip test how is it used to evaluate my circuit breaker?

A: The first trip test uses small clamp-on current transformers that connect to the coil circuit and the load, or protection transformers on the circuit breaker while the breaker is still in service.The breaker is then tripped and the coil current is measured along with the voltage drop. The current extinction times of the three phases are also measured. The coil current trace and other parameters can be compared to previous measurements to see if the breaker is operating normally. This test ensures that no operation is left unmeasured and actually gives a picture of “real life” conditions and how the circuit breaker operates after remaining closed for months or even years.

Q: Since first trip evaluates “real life” conditions, do I still need to perform traditional offline timing on my circuit breaker?

A: Because first trip is relatively easy and quick, some people have tried to replace traditional timing tests with first trip testing. However, it is important to keep in mind that first trip testing complements but does not replace offline time and travel analysis. With first trip you are comparing previous measurements and trending, but time and travel analysis allows you to not only compare and trend results, but to actually verify that the circuit breaker is operating within manufacturer and IEEE/IEC specifications.

Q: You mention time and travel analysis, but connecting the transducer is often difficult. With this in mind, are travel measurements really necessary? Why can’t I just perform timing? 

A: Timing ensures that the three phases are synchronized and that the contacts are opening at the correct time, but travel measurements provide a lot more information on how the contacts are actually performing. Travel verifies the stroke of the circuit breaker, as well as the velocity of the contacts. The circuit breaker times can be out of specification, but as long as the velocity of the interrupter is correct it will still be able to clear the fault. Additionally, travel will reveal mechanical issues such as overtravel and over damping. In order to simplify transducer connections, Megger provides a variety of transducers and connection adapters that fit multiple circuit breakers.

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