Daily Shaarli
Yesterday - September 15, 2026
A negative sequence current arises when the voltage and current in a power system are unbalanced. This type of current produces a reverse rotating magnetic field in the air gap, which has a synchronous speed but rotates in the opposite direction to the rotor. This reverse rotating field is detected by points on the rotor surface and can cause damage to rotating machinery if left unchecked. It is important to have Negative Sequence Current Ratings for generators as it is expected that they will not be connected 100% Negative-Sequence all the time, with three statements about the power system needing to be true for this to occur. Excessive negative phase sequence current can cause excessive heating, vibration, and bearing wear, leading to long-term damage or even machinery failure.
negative sequence current
Before you discovered Zenni, when you paid 10 times more for glasses you bought at the local optical store, the optician adjusted them for you.
But you can do it yourself, by following these easy-to-understand instructions.
Don’t worry. Your frame can stand a little bending. And when you’ve been wearing them for a while and they get out of shape again, just repeat the adjustments, and you’re good to go!
Freedom to build what you want
FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters.
Create 3D from 2D & back
FreeCAD allows you to sketch geometry constrained 2D shapes and use them as a base to build other objects. It contains many components to adjust dimensions or extract design details from 3D models to create high quality production ready drawings.
For professional design needs...
FreeCAD is a powerful and evolving open-source parametric 3D modeler, well-suited for many professional and technical tasks. Each new release marks a milestone in stability and usability. FreeCAD puts you in control - no licensing fees, no vendor lock-in. It's not just cost-effective - it’s yours to adapt and build upon.
...And for everything else
Whether you're prototyping, 3D printing, designing furniture, or learning CAD, FreeCAD offers the tools to support your creativity. With a strong community, extensive documentation, and a growing ecosystem of add-ons, it’s a great place to start - and to grow. No sign-up, no paywall, no restrictions. Just open-source freedom at your fingertips.
What is pupillary distance?
Pupillary distance (PD) measures the distance between the centers of your pupils and is used to center a prescription lens accurately in your frames. Your optician will usually measure your PD or you can use our digital PD ruler to measure it quickly online.
From custom taskbars to secret productivity tweaks, Windhawk gives you complete control over your PC, no registry hacks required. //
Windhawk is a free and open-source tool that helps you tweak aspects of Windows and your apps in ways that Microsoft and developers would never allow, combining a sophisticated code injection technique with an intuitive interface. The project's developer, Michael Maltsev, says it now has 1.5 million users, and Microsoft employees are increasingly enthusiastic about it, too. March Rogers, partner director of design at Microsoft, recently called it "amazing."