Please understand what the test is actually telling you.
An insulation resistance measurement is determining the resulting dielectric capability of an insulation system as a result of absorbed moisture INSIDE the insulating material, AND the presence of conductive SURFACE contaminant. Both of...
1. One cannot be "on a visa" with an expired passport. When the passport expires, THE VISA EXPIRES THE SAME DAY. Note: most of the time one CAN renew their passport during the period of a visa, if two requirements are met - first, the visa allows it and second, the renewal can be accomplished...
For P1-9 I would :
1. Create the cylinder (67 mm length by 54 MM diameter)
2. Add on the 45 x 45 x 33 mm rectangle at one end
3. Locate the correct position and add the two rectangular feet below the cylinder
4. Locate and remove material from the first rectangle to mimic the 20 mm diameter...
The P1-17 image has two chamfers.
The one at the bottom of the bolt (0.75 x 45 deg) can be created using either a known intersection and an angle (0.75 from end of bolt for example), or by chamfering between two known intersections (each 0.75, since the angle is 45).
The one at the top on the...
See another thread that is currently under discussion ...
https://www.eng-tips.com/threads/two-winding-transformer-equivalent-from-a-three-winding-transformer.528343/
How small is small?
The physical casing surrounding a rotating machine that meets IP67 or 68 is going to impose some limitations on minimum volume because to meet the ingress protection rating requires that there is no effective air exchange between the exterior and interior of the casing...
Take P1-11 as a simple example.
There is a solid cylinder with 20 mm diameter and 45 mm length.
Inside the cylinder is a rectangular cutout that runs parallel to the axial center of the cylinder. It is 10 mm wide.
Note that there are two assumptions made:
1. the rectangle is actually square...
The reason for "direct testing" of direct-axis reactances is that it IS pretty much a direct measurement from the data that can be physically tested for.
There is also some fairly well-known relationships between the direct axis and quadrature axis values, as there is between positive (direct...
Most OEMs who manufacture "standard" ratings will have a very capable ability to calculate the expected synchronous, transient, and subtransient reactances for their generator internal geometries and "normal" ratings.
Proof of performance is accomplished during the factory acceptance testing...
Since your post hinted that you're basing comparison or viability on financial criteria (payback period, Net Present Value, Internal Rate of Return) instead of environment (once-through system, for example) then you need to also define a specific duration BEFORE making the comparison.
For...
You're sure about that?
500 in/hr = 1270 cm/hr = 0.35 cm/s.
Gravel is one of the more useful materials and ranges between 0.1 and 100 cm/s.
Clean sand can get you somewhere in the 0.001 to 1.0 cm/s range.
See the wiki table from the following link...
First - what kind of motor? Squirrel cage induction, wound rotor induction, synchronous, or direct current? Or something else?
Chances are the machines are not going to perform exactly the same due to tolerance buildup in material properties and geometry, so there will be some inability to...
Go to the Siemens relay configurator and copy/paste both product codes into the <search> bar.
Step through the configurator and the last page will tell you what the specific sequence means, in (relatively) plain English.
If the two descriptions match, chances are good that the relays can replace...
One of the overlooked factors in wind power is the duration of a fault. Until the rotor comes to a complete stop - regardless of whether the breaker opens to isolate the stator from the grid - the fault will continue to be fed from the moving rotor. Most modern DFIG gens use a "power take off"...
The point I was getting at is that your "improvement" is based on a specific group of data inputs. The data that you get is related to the question I asked initially.
Look at the home security systems in your country - are they all the same? Or do some work better than others (in terms of...
1. How far away can the subject be before facial recognition is compromised?
2. What happens if the subject is not directly facing the sensor? (Note that this is pretty common for visitors who don't realize they need to be "scanned" to avoid tripping an alarm - and equally common for those...
A couple of questions to be sure we understand what you're asking:
1) Is the filter acting on the drive output (between drive and motor, for example) or on the drive input (between drive and utility, for example)?
2) How much load (current) is being applied - both in actual amperes and in per...
Subtransient reactance impacts the ability of a generator to work as much like a utility as possible so system loads can work normally when running on a generator set. The objective of an alternator selection process is to get as close to a utility capability as possible. From a generator...
