My experience with synchronizing to the grid is that solutions that somehow mimikry the behavior of a rotating mass work fine. This is robust against errors or short term disturbance. We implemented this as a three-phase PLL on 16 bit µC more than 25 years ago, but the concept was already...
For type 3 the stator winding is able to provide a significant SC current as described by wcaseyharman. However, this is not mandatory in most areas and it creates significant stress to the rotor side inverter, making its design challenging.
Look for the keywords "low voltage ride through" or "grid code". These regulation define how wind turbines have to behave during a fault. In general they have to stay online for a defined duration and feed in a little more than nominal current during that time.
Power from the turbine has to...
Fully agree to thermionic1. Askarel/PCB was by far more a curse than a benefit in regard to safety. But there are other fluids where at least no sever health or environmental risks are known although they are in use for several decades. I have worked on units of several 10 MVA using silicone oil...
You have to be aware that poor power factor can be caused by inductive load (lagging) or by capacitive load (leading). Unless you know your power factor without any capacitors connected you can`t decide.
Maybe you just pay the penalty for the capacitorys causing leading power factor.
Let me provide some background on disaster protection related to transformers.
- the usual liquid for cooling transformers is mineral oil as it provides excellent isolation and cooling - however this oil is flammable
- protection and regular maintenance, e.g. derived from regular oil analysis...
From your description of load there is no reason to use a capacitor bank.
Your (small) welder most probably uses power electronics may even provide power factor correction and the grinder has low power and might rune in worst case at a power factor of 0.6 or 0.7.
Power is proportional to the product of speed and torque. As for electric motors torque is given by the rotor dimensions, lower speed motors have lower ratings.
Green hydrogen is extremely important to achieve climate targets, but not for putting into lots of new applications, but to replace the hydrogen currently generated by steam reforming. Only when we have achieved this replacement we should start to think about hydrogen or hydrogen derivates for...
Such kind of power supplies is quite common for electroplating. Look for a "pulse plating power supply" and you may find something suitable for your application at reasonable cost.
A busbar joint is much more complex as commonly considered. The performance is a combination of busbar material, coating,clamping hardware and maximum temperature. I can confirm that in US silver is preferred, at least on Cu, whereas the rest of the world prefers other coatings. Some of our...
At 15hp drives rarely use IPMs. More likely the drive uses a PIM - a module containing all power semiconductors including the input rectifier. But often in this power class the driving circuit is not done by isolated drivers but by level shifters (similar like in a IPM, but outside the module)...
With 5800 kVA it is unlikely that these transformers power public distribution, lighting or drives. Maybe the load is some process equipment. In this case it is beneficial that with an ungrounded secondary there are no large fault currents in case of an insulation failure. However, insulation...
Please post the diameter of the pole face and the thickness of the package as well as the nameplate of the rectifier. With this information it is feasible to find an equivalent device.
Also consider regions outside Amercia: 690 V is common in European heavy industry. That is the reason why a lot of equipment is available for this voltage class, also from US-based suppliers.
Some more information:
Infineon will not discontinue all 2nd Gen. IGBTs in 62mm. One chip variant for fast switching is still marked as active:
FFXXXR12KS4 (XXX: nominal current in A)
See...
The device initially used in the Stromag servo drive is a first generation IGBT. Currently the manufacturers are selling 7th generation devices. The cross reference list from Semikron is helpful, but also the suggested replacements are already discontinued (2nd generation IGBTs). When buying...
