Pardon the pun, but why were the transformers connected WYE-WYE? Everything I have ever used was either Delta-WYE, or Delta-Delta. There are too many problems WYE-WYE which is why it is almost never used.
Sometimes, those high power gen-sets need to have a neutral grounding resistor installed to prevent that very problem. Most of my experience is with solid-state inverter units but the principals are still the same.
Harmonic currents make me think of rectifier-capacitor style power supplies - these generate a large current pulse just before the voltage crest as the filter capacitor charges. I suspect this is where the load-side 3rd harmonic current was actually coming from.
Today, we would install power factor corrected power supplies that force current to be in proportion to the voltage, and make the load (field winding power) appear almost purely resistive. A smaller field transformer would have worked quite well in that situation as there would have been little or no neutral current, even at full load.
Before PFC power supplies were common, oversized transformers or harmonic filters were just about the only way to deal with harmonic currents.
The company says it anticipates high-definition video for home security and other uses will be the next mature technology integrated into the IoT domain, hence the introduction of its MatrixCam devkit.
Siemens and Georgia Institute of Technology are partnering to address limitations in the current additive manufacturing design-to-production chain in an applied research project as part of the federally backed America Makes program.
Most of the new 3D printers and 3D printing technologies in this crop are breaking some boundaries, whether it's build volume-per-dollar ratios, multimaterials printing techniques, or new materials types.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.