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What is the temperature of the dry-type transformer?
- Dry-type transformers are generally 130 ° C alarm.
Most dry-type transformers now use H-class insulation. Under normal circumstances, the normal operation of the transformer temperature control control settings: 80 ℃ automatic fan, 100 ℃ automatic fan, 130 ℃ high temperature alarm, 150 ℃ high temperature trip.
National standard "dry-type transformers" GB6450-1986 on the dry-type transformer temperature limit to make the provisions.
1, the dry-type transformer coil:
A. The use of A-class insulation material, the limit operating temperature at 105 ℃, the maximum temperature rise should be less than 60K;
B. When using E-class insulation material, the maximum working temperature at 120 ℃, the maximum temperature rise should be less than 75K;
C. When using B-class insulation material, the maximum working temperature at 130 ℃, the maximum temperature rise should be less than 80K;
D. When using F-class insulation material, the maximum working temperature at 155 ℃, the maximum temperature rise should be less than 100K;
E. When using H-class insulation material, the maximum working temperature at 180 ℃, the maximum temperature rise should be less than 125K;
F. When using C-class insulation material, the maximum working temperature at 220 ℃, the maximum temperature rise should be less than 150K.
2, the core, metal parts and adjacent materials, in any case, shall not appear to make the core itself, other parts or adjacent materials damaged by the temperature. Now most of the dry-type transformers are used H-class insulation material, it is generally said that the dry-type transformer temperature should be below 180 ℃.s
Stepdown Transformer 220V input 110V output.?
- I live in New Zealand. We use 240v 50Hz mains here too. USA uses 110/115v 60Hz. There is a 10Hz voltage frequency difference as well as the voltage difference. The stepdown transformer will be rated for 110v RMS(root-mean-squared). This is a kind of average, for want of a better description. The peak voltage is 0.707 times the RMS voltage. This is the peak on one half of the sine-wave(180'), therefore the complete sine-wave mains frequency represents 1.414 times the RMS voltage.(360' sine-wave cycle) Multiply 110v by 1.414, and you will get the peak-voltage, which is the maximum that the AC voltage can swing, both in the positive and negative parts of the sine-wave. 110v example: 110 x 1.414 155, therefore, the PEAK voltage for the States is 155v AC, or thereabouts. 240v example: 240 x 1.414 339, therefore, the PEAK voltage for Aus/NZ is 339v AC, or thereabouts. All mains voltages are a measure of averages(RMS), so a 10 or so volts either side of the stated voltage, should not prove to be a problem. Provided that the stepdown transformer can supply at least a few amps of current on the secondary(the 110v side), there will be no problems at all. Technically, the 10Hz frequency difference can make a slight difference, especially if you are trying to power some sound equipment from the States, as the Australian/New Zealand 50Hz frequency will mean that the motor will run slightly slower then the designed RPM. However, in your case, I don't think it will make one iota of difference. :)s
friedland d753 door bell transformer?
- Years ago 25+ Friedland bell transformers had two glass fuses 0.5amp,these very small glass fuses protected the transformer windings.These could be the fuses they are referring to,the main supply,as you have pointed out is fed from your circuit board. Isolate that breaker and remove the cover on your transformer and have a look for your fuses,these glass fuses are about half an inch long.Hope you are successful.s
Switching Transformer, Alternative to MPPT Charge Controller? (wind+solar)?
- Homemade okorders
Can the steel of a ferromagnetic transformer instead be fashioned as a set of windings, acting as a secondary?
- An AC transformer connects AmpereTurns in the Primary to AmpereTurns in the Secondary using the time varying magnetic field in the core. The maths for the size of the core is well established. If you double back on turns they do not count as part of your ampereturns - unless you shield the doubled bit. Such methods are used in shaded pole motors. The only way to lighten the Tx is to use higher frequencies in the core. This 'dumps' the magnetic energy into the secondary more often so you can use a smaller core (bucket of energy!) The magnetic field is always perpendicular to the current and hence so are the core loops (in a Vector Notation sense - not necessarily physically) If you introduce Iron windings in the windings space you will get bigger Ohmic Losses. I hope this helps - you obviously have a plan to make hyper-efficient Tx but they are already near 0.999 efficiency.s
Please could someone assist on electrical transformers?
- To improve the performance of a transformer, you have to:-  Reduce the copper losses, and  reduce the iron losses. Copper losses can be reduced by using copper wire of the highest purity; and by using copper wire that has the thinnest possible layer of insulating material on it. These measures, taken together, reduce the length of the wire and therefore its resistance. Iron losses are reduced by using magnetically soft iron in the laminations. This is the type of iron that has a tall and narrow hysteresis loop. Using copper wire with thin insulation (as mentioned above), keeps the windings close to the iron and so reduces magnetic leakage. A third measure is to use very thin laminations and to insulate them with very thin material as this will reduce eddy currents. It is very expensive to build a 99% efficient 250 MVA transformer. The losses in a 94% efficient version, are often cheaper to manage than the extra cost of making the 99% version.s
How to hook up a dimmer and transformer for a hot wire cutter?
- The number of wires on the transformer don't match with the stated voltages. The two blacks are probably the 120 volts input (assuming this is the US) but the 3 wires on the secondary imply you have a center-tap secondary, possibly 25 volts center tapped at 2 amps. I'm also assuming that the hot wire is sized to operate on 25 volts. The transformer should come with some sort of labels for the wires, if not take it back and get one that does. Once you get the transformer straightened out, here is a wiring list. AC hot from line cord black wire to one side of a 1 amp fuse holder AC neutral from line cord white wire to one of the line connections of the transformer AC ground from line cord green wire to transformer case and to case of dimmer (green) and to metal case this is all mounted in. Other side of fuse holder to one of black wires of dimmer Other black wire from dimmer to the second of the line connections of the transformer One of secondary wires on transformer to one side of the hot wire Other secondary wire on transformer to other side of the hot wire Tie the center tap of the secondary, if there is one, to ground. If not, tie one of the secondary wires to ground. You will note that I included a small 1 amp fuse. You can get a small metal box to mount this stuff in, or a electrical junction box. The latter is better as it has punchouts for cable in and out. Be sure to clamp the wires where they enter and leave the box.s
What is the reactive power compensation of the transformer?
- The use of capacitors to compensate for reactive power, improve the transformer's active power output capability.s
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