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How a power facility reduced 40% of calibration time

Many facilities, such as power plants or production facilities, depend on a strong preventive maintenance program. These programs are essential to keep processes running safely and efficiently. Performing accurate and consistent pressure calibration on process instrumentation is an integral...

Electrical Power Explained – Part 4: Unbalanced three-phase AC power

In our last blog, we described how balanced three-phase AC systems act like three independent single-phase systems. There's no neutral current, and the total active and reactive powers are just the sum of the active and reactive phase powers....
three-phase AC power

Electrical Power Explained – Part 3: Balanced three-phase AC power

Large three-phase motors and the equipment they drive should consume power equally from each of the three mains phases. However, that often doesn’t happen. Unbalance and harmonics can cause instability, with motor vibration that reduces both efficiency and lifetime....

Why does cable length between VFDs and motors matter?

It is an undeniable fact that frequency inverters provide the most benefits of the many methods of controlling induction electric motors. However, in some cases the use of a frequency inverter can have a negative effect on the motor....

Choosing the right current clamp

Many users of an energy logger, power logger or power quality analyzer usually use the tool’s supplied current clamp in their application. Since the supplied clamp has a specific measurement range, it’s very well possible that it doesn’t fit...

Why is there an arrow on your current clamp?

As you can see in the images above, on all current clamps and current clamp accessories there is an arrow placed on there, close to the beak or inside the beak opening. So what should we do...

Current Clamps; AC, DC or Rogowski… what is the difference?

Since explaining the difference between these three separate ways of measuring current needs to include the principles of measurement, this blog is a little longer than normal. Nevertheless, it is worth reading to get the difference and avoid making...

The surest way to diagnose high-voltage surge arresters

Surge arresters play a key role in protecting electrical devices and equipment in high-voltage electrical substations. Like other devices, they must be periodically diagnosed. The most common method is visual inspection: checking that the arrester has no visible external...

Electrical Power Explained – Part 2: Single-phase AC power

You need a thorough grounding in single-phase power before you can understand the three-phase supplies used in large industrial and commercial facilities. That means understanding the relationships between the sinewave voltage supplied by your utility and the resultant non-sinewave...
Harmonics

Harmonics – where do they come from?

Harmonics can cause all sorts of problems: tripped relays, failed transformers, damaged capacitor banks and even cracked motor shafts. But where do they come from, and how do you cure them? Non-linear loads like low-energy lights, VSDs, switched-mode power supplies...

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How to setup the 173x series energy logger

Most of us work in tech support departments and one of the most frequently asked questions we receive is: how to set up a energy...

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