I have already seen a transformer on the pole in Germany. The 3 HV lines go in at the top and four lines (L1, L2, L3, N) come out at the side. The output is a wye configuration.
In few materials I have read, the single, thin wire above the 3-phase HV wires is just for lightning protection. It either go directly to the local ground (pole ground), or through a resistor to go to the ground. In those articles, they never said it serves as neutral wire as well.
A lot of buildings around me only bring in two phases. The larger transformer connects to one phase and it has a center tapped secondary for a neutral. The smaller transformer connects to the other phase and is simply a 120 volt transformer. Every 3rd breaker is a high leg with respect to neutral. Do you have a video on this? I do understand how the voltages work out, but I don’t understand how a 3 phase compressor or motor can run on two phases like this without needing a run capacitor. The rotating magnetic field that the 3 phases would provide is broken in this configuration. Line 1 is perfectly in phase with line 2. Line 3 is 120* out of phase with line 2. And then line 1 is 240* out of phase with line 3. Seems like this would destroy the motor.
Excellent video, I finally learned the basics behind the power wires in my neighborhood, thank you ! One question I have is why the three phase power lines that run from the substation to the transformers on the poles changed from horizontal array to vertical array and back to horizontal array ? What is the difference and why not horizontal all the way ? Thanks again.
most likely clearance/right of way issues. I rural locations, right of ways can be wider allowing horizontal arms to support the conductors. In more dense locations, narrower right of ways force vertical arrangement of the conductors. As long as the distance between each phase is maintained, either way works. I'm sure there are maintenance pros and cons. Also, note the higher the voltage, the larger the distance between each phase. 765kV transmission towers are massive with the widest right-of-ways.
Can a three phase three wire DELTA distribution system (no neutral back to the substation) be connected to a SINGLE PHASE one bushing transformer which would CASE GROUNDED to earth at the pole? (meaning no neutral back to the substation)? thank you
@@RR42636Thank you. Would the NEV (neutral to earth voltage) still be measurable when only multi point grounding at each pole? Again, no parallel neutral back to the substation. Thank you
The word guy or stay is interchangeable. Guy wire, stay wire or aerial guy are the terms I have commonly heard but generally you would use the terms guy wire or stay wire when the wire goes from pole to ground and aerial guy/stay when its bracing pole to pole. A stay or guy provide support to the pole/structure. A guide wire is used in other various applications and industries to "guide" objects along the length of the wire. Best look up the definitions of these three words, guy, stay and guide wires.
Excellent explanation but is it just me or is there something about the way he says vOLtage. It’s like he is being shocked with some voltage when he says the o in vOLtage. Like stewy and the way he said cool Whip
Can you please tell me how to calculate, the fuses in the primary for a transformer 600 volts, 3 phases, 75 KVA? Primary Delta and secondary Why. Thanks.
very good explanation and graphic presentation. thanks a lot sir
Thank you for subscribing. Keep watching and learning. Please do spread the word so others can learn too.
A lesson for somewhat advanced learners. thank you
Thanks for this compact explanation of wye/delta configs.
I have already seen a transformer on the pole in Germany.
The 3 HV lines go in at the top and four lines (L1, L2, L3, N) come out at the side.
The output is a wye configuration.
In few materials I have read, the single, thin wire above the 3-phase HV wires is just for lightning protection. It either go directly to the local ground (pole ground), or through a resistor to go to the ground. In those articles, they never said it serves as neutral wire as well.
It won't. Dangerous as crew would have to work above primary to establish neutral connections
For a Wye distribution line, the neutral is generally below the hot wires, at the level of the bottom of the transformer.
Excellent presentation. Thank you for sharing your knowledge.
A lot of buildings around me only bring in two phases. The larger transformer connects to one phase and it has a center tapped secondary for a neutral. The smaller transformer connects to the other phase and is simply a 120 volt transformer. Every 3rd breaker is a high leg with respect to neutral. Do you have a video on this? I do understand how the voltages work out, but I don’t understand how a 3 phase compressor or motor can run on two phases like this without needing a run capacitor. The rotating magnetic field that the 3 phases would provide is broken in this configuration. Line 1 is perfectly in phase with line 2. Line 3 is 120* out of phase with line 2. And then line 1 is 240* out of phase with line 3. Seems like this would destroy the motor.
Excellent video, I finally learned the basics behind the power wires in my neighborhood, thank you ! One question I have is why the three phase power lines that run from the substation to the transformers on the poles changed from horizontal array to vertical array and back to horizontal array ? What is the difference and why not horizontal all the way ? Thanks again.
most likely clearance/right of way issues. I rural locations, right of ways can be wider allowing horizontal arms to support the conductors. In more dense locations, narrower right of ways force vertical arrangement of the conductors. As long as the distance between each phase is maintained, either way works. I'm sure there are maintenance pros and cons. Also, note the higher the voltage, the larger the distance between each phase. 765kV transmission towers are massive with the widest right-of-ways.
What’s the negative side of Delta not having a neutral? Symptoms?
Thanks, Austin
At 4:58 , instead of saying phase to phase , saying line to line voltage would make the concept more clear , I guess
Agreed! «Phase» is a very confuting word. May denote a voltage, a wire or a phase angle.
EE EIT, that was awesome! Thank you!
Really loved your channel and subbed it today.. I am studying electrical engineering and it is gold
Thank you :) very good info
Thank you for subscribing.
Me watching this video: beautiful explanations - I understand what’s going on here but what does a turban have to do with this?
He mentioned turbines, but I think he really means generators (which the turbines will spin and is the part that generates the electricity).
Thanks a lot and I need more videos
Good job
Can you please have a video about tap changer in transformer?. Thank you.
00p0000ppppppp}p}ppppp000000😊😊
Super
Interesting that I haven’t seen any pole mounted transformers in Singapore (obviously) and Malaysia!
What’s going on?
underground to hide from typhoons
Or mounted at ground level in water proof transformer vault.
How is load balanced across phases for transmission?
Can a three phase three wire DELTA distribution system (no neutral back to the substation) be connected to a SINGLE PHASE one bushing transformer
which would CASE GROUNDED to earth at the pole? (meaning no neutral back to the substation)? thank you
yes
@@RR42636Thank you. Would the NEV (neutral to earth voltage) still be measurable
when only multi point grounding at each pole? Again, no parallel neutral back to the substation. Thank you
Serious question. Is it “guy wire” or “guide wire”? @ 17:27
The word guy or stay is interchangeable. Guy wire, stay wire or aerial guy are the terms I have commonly heard but generally you would use the terms guy wire or stay wire when the wire goes from pole to ground and aerial guy/stay when its bracing pole to pole.
A stay or guy provide support to the pole/structure. A guide wire is used in other various applications and industries to "guide" objects along the length of the wire. Best look up the definitions of these three words, guy, stay and guide wires.
Excellent explanation but is it just me or is there something about the way he says vOLtage. It’s like he is being shocked with some voltage when he says the o in vOLtage.
Like stewy and the way he said cool Whip
Wire guard on pole not conduit
a vOOOLt meter
Can you please tell me how to calculate, the fuses in the primary for a transformer 600 volts, 3 phases, 75 KVA? Primary Delta and secondary Why.
Thanks.