Anyone help me in electrical engineering stuff ??

[Quasar44]

This is super confusing

What is 3 phase 6 pulse vs 12 pulse ??

What is voltage ripple ??



omg

 

[Quasar44]

Ok I get that rectifier converts AC to DC

A 6 pulse gives you more stable DC flow

 

[JohnDB]

This is super confusing

What is 3 phase 6 pulse vs 12 pulse ??

What is voltage ripple ??



omg

"Pulse" sounds more like the hertz or frequency of the generator/alternator.

A generator/alternator will pulse + or - volts for each phase. A 6 pulse will have 2 pulses (one positive and one negative) per phase and a 12 will have 4 per second. These pulses can be multiplied by using a transformer and separate windings. Or you can use a VFD in which high AC wattage is turned into DC and then transistors pulse out positive and negative Current to simulate a sine wave.

Current and voltage is generated by the RELATIVE motion of a coil passing through a magnetic field. (Meaning actual, physical motion is not required....just an increasing and decreasing magnetic field)

 

[Thunk]

A voltage nipple?

WTF are you studying? How to torture people?

Next you'll ask how bad it hertz.

 

[JohnDB]

Voltage ripple is a reference (most likely) to harmonics on a circuit. This comes from coils or inductive resistance. (Florescent light balasts and motors) which draw current until the demands draw to the knee of the transformers capabilities and the ripple from these sorts of coils send harmonic waves through the neutral into the transformer. (Seen a lot on delta/wye transformers) These harmonics are usually harmless until they reach triple the frequency (180hz, 360hz and etc)
Their frequency keeps them hidden from meters but they are often caught by thermal breakers which measure current and not voltage.)

 

[mudwhistle]

Voltage ripple is a reference (most likely) to harmonics on a circuit. This comes from coils or inductive resistance. (Florescent light balasts and motors) which draw current until the demands draw to the knee of the transformers capabilities and the ripple from these sorts of coils send harmonic waves through the neutral into the transformer. (Seen a lot on delta/wye transformers) These harmonics are usually harmless until they reach triple the frequency (180hz, 360hz and etc)
Their frequency keeps them hidden from meters but they are often caught by thermal breakers which measure current and not voltage.)

I was studying this back in the early 80s.

That and truth tables for microchips and Boolean algebra.

 

[JGalt]

This is super confusing

What is 3 phase 6 pulse vs 12 pulse ??

What is voltage ripple ??



omg

Voltage ripple is a voltage variation in rectified DC voltage. That would most likely indicate faulty components in the rectifier stage, such as filter capacitors or possibly the rectifier diode. DC voltage should have a completely stable and flat voltage level, as opposed to AC voltage which constantly changes polarity.

 

[JohnDB]

Voltage ripple is a voltage variation in rectified DC voltage. That would most likely indicate faulty components in the rectifier stage, such as filter capacitors or possibly the rectifier diode. DC voltage should have a completely stable and flat voltage level, as opposed to AC voltage which constantly changes polarity.

View attachment 1051294

I've never heard of a diode only going partly bad before. They either work or they don't.
Possibly some leakage voltages from dirt but with those high voltages it's to be expected. You can't filter all the air. And why should you?

Demand getting into the knee of a transformer? OH YEAH.....happens quite often.

 

[Moonglow]

Ok I get that rectifier converts AC to DC

A 6 pulse gives you more stable DC flow

Is it sawtooth rectification?

 

[Moonglow]

Me too fro the TOW

I was studying this back in the early 80s.

That and truth tables for microchips and Boolean algebra.

Me too for the TOW/DRAGON anti-armor missile systems maintenance course

 

[JGalt]

I've never heard of a diode only going partly bad before. They either work or they don't.
Possibly some leakage voltages from dirt but with those high voltages it's to be expected. You can't filter all the air. And why should you?

Demand getting into the knee of a transformer? OH YEAH.....happens quite often.

I was referring to vacuum tube rectifiers.

I guess I showed my age.

 

[mudwhistle]

Me too fro the TOW

Me too for the TOW/DRAGON anti-armor missile systems maintenance course

I was trying to learn it in college.

They always tell you that you need to know this......then they tell you after you spent months learning it that you'll rarely use it.

 

[Moonglow]

I was trying to learn it in college.

They always tell you that you need to know this......then they tell you after you spent months learning it that you'll rarely use it.

I used it in 1990-1992 when I calibrated weighscales.

 

[JGalt]

I was trying to learn it in college.

They always tell you that you need to know this......then they tell you after you spent months learning it that you'll rarely use it.

As a previous electronics tech, I never once used algebra, trigonometry, or calculus.

And thank God for handheld calculators.

 

[JohnDB]

I was referring to vacuum tube rectifiers.

I guess I showed my age.

They still use those for Diodes and Transisters for really high voltage or current situations. (I literally can't remember which at the moment) But it's not like you will see them very often. Even at the powdered steel plant they didn't use those. It was either at the television station or Bell South that used them....I can't remember which.

 

[Arlette]

This is super confusing

What is 3 phase 6 pulse vs 12 pulse ??

What is voltage ripple ??



omg

Thoughts and prayers

 

[Arlette]

Quasar44 is gonna flunk.

 

[JohnDB]

As a previous electronics tech, I never once used algebra, trigonometry, or calculus.

And thank God for handheld calculators.

Pipe runners (conduit bending) you use these things constantly if you are going to be any good. For big pipe 4"-8" conduits you really need the mathematics and trig. Basically you only have so much room to work with and a monster sized pipe to bend which has a bend radius...meaning a 2" offset is going to be so small an angle you likely won't see it.

 

[mudwhistle]

I used it in 1990-1992 when I calibrated weighscales.

I never applied it hands-on. I was learning theory.

I was living in CA and was always broke. CA is a bad place to live if you're broke, unless you don't mind being on welfare.

So I went into the Army and went to 36L school at Fort Gordon. By the late 80s I was in the Q Course.

I kindof moved around a lot until I was stationed at 5th Group here at Ft Campbell in 91'.

SGM Simms asked me if I wanted to go to school or go to a team when he first interviewed me.

I told the SGM to send me to a team. This was right after the ground war started in Kuwait.

 

[mudwhistle]

Ok I get that rectifier converts AC to DC

A 6 pulse gives you more stable DC flow

Capacitors do the same thing.

Usually when your condenser goes bad on your HVAC unit....you condenser fan won't come on.