This setup will measure C phase resistance as well as the resistance of the jumper from B to C. If the jumpers are good quality and connected well, thats probably fine and wont change the results much. Its alot more effort, but whenever I test generator ISO-Phase bus (longer jumpers required to span the distance between phases), to test C phase, we would jumper A to C for current path, then jumper B to C for voltage measurement. This way it removes the resistance of the jumpers. The extra effort is from having to reconfigure the shorted end for each test.
That's a good point, the important thing would be to minimize that shorting resistance as much as possible. For larger isophase bus that is much more of a concern than smaller bus duct.
Agreed, in theory it should work, but in practice I've had mixed results. I usually test: Phase P1/C1 P2 C2 Jumpers A A C N C to A & N to A B B C N C to B & N to B C C A B A to C & B to C N N A B A to N & B to N G G A B A to G & B to G
This is a surprisingly difficult concept to explain and you did a great job on it. The one thing I'd suggest including is how to split the leads. I'm seeing it become increasingly common to test the insertion resistance of the plugs going into the bus taps. A follow up video showing that concept would be a good one. It seems simple until you have a bus row using every tap point and a client that wants a reading isolated to just one plug, meaning you cant read from plug 1 line side to plug 2 line side since that captures the insertion of both plugs.
That's a good idea for its own video! I think I would need better visual aids for that though, probably one I'd need to shoot with bus and plugs in hand. Next time that opportunity arises I'll do my best to make it happen.
In "How to test relays ep0" you said episode two would be PTs , CTs ,trip circuits and schematics (how the relay interact with the power system).... hope you are still going to post it.... Thank you for sharing.
Yeah, I have big ambitions, and then my plans change constantly! I'm working like a dog right now at day job, and this channel is down the priority list after family and stuff. I make as much content as I can, but some times timing videos has to flex around when I have parts, equipment, and patience available lol. That is certainly a topic I'm going to cover though!
I understand the reason for splitting the leads, but since your using A phase as I2, is the resistance of the A phase bus added to the resistance of C phase bus? And adding to the topic of measuring longer bus assemblies, what do you use/recommend for a situation where you would need ~100’ leads?
Since the DLRO uses the resistance between P1/P2, the voltage drop of the only phase with both a P and I leads connected is the only one being measured. This technique works any time the thing we're testing is longer than your leads, even cables!
![[LIVE] : ONE ลุมพินี 88 | คู่เอก "ป้อมเพชร vs อัสลามจอน"](http://i.ytimg.com/vi/1ZqTVVbMgbo/mqdefault.jpg)
This setup will measure C phase resistance as well as the resistance of the jumper from B to C. If the jumpers are good quality and connected well, thats probably fine and wont change the results much. Its alot more effort, but whenever I test generator ISO-Phase bus (longer jumpers required to span the distance between phases), to test C phase, we would jumper A to C for current path, then jumper B to C for voltage measurement. This way it removes the resistance of the jumpers. The extra effort is from having to reconfigure the shorted end for each test.
That's a good point, the important thing would be to minimize that shorting resistance as much as possible. For larger isophase bus that is much more of a concern than smaller bus duct.
Agreed, in theory it should work, but in practice I've had mixed results. I usually test:
Phase P1/C1 P2 C2 Jumpers
A A C N C to A & N to A
B B C N C to B & N to B
C C A B A to C & B to C
N N A B A to N & B to N
G G A B A to G & B to G
This is great, thank you for the video! Currently working in a data center and this is exactly what I needed.
Great to hear!
TRAY! Hahaha I’m testing the bus duct at Google in Omaha now
@@WillieCarpenter17 Yeahhhhh buddy!!
🤫 you're not supposed to call it google lol gotta use their code names.
@@testingtechtips Oopsie 😂
This is a surprisingly difficult concept to explain and you did a great job on it. The one thing I'd suggest including is how to split the leads.
I'm seeing it become increasingly common to test the insertion resistance of the plugs going into the bus taps. A follow up video showing that concept would be a good one. It seems simple until you have a bus row using every tap point and a client that wants a reading isolated to just one plug, meaning you cant read from plug 1 line side to plug 2 line side since that captures the insertion of both plugs.
That's a good idea for its own video! I think I would need better visual aids for that though, probably one I'd need to shoot with bus and plugs in hand. Next time that opportunity arises I'll do my best to make it happen.
In "How to test relays ep0" you said episode two would be PTs , CTs ,trip circuits and schematics (how the relay interact with the power system).... hope you are still going to post it.... Thank you for sharing.
Yeah, I have big ambitions, and then my plans change constantly! I'm working like a dog right now at day job, and this channel is down the priority list after family and stuff. I make as much content as I can, but some times timing videos has to flex around when I have parts, equipment, and patience available lol. That is certainly a topic I'm going to cover though!
@@testingtechtips THANKYOU for your time,,,,,
I understand the reason for splitting the leads, but since your using A phase as I2, is the resistance of the A phase bus added to the resistance of C phase bus? And adding to the topic of measuring longer bus assemblies, what do you use/recommend for a situation where you would need ~100’ leads?
Since the DLRO uses the resistance between P1/P2, the voltage drop of the only phase with both a P and I leads connected is the only one being measured.
This technique works any time the thing we're testing is longer than your leads, even cables!