clean earth, dirty earth, instrument earth

[ahlburuto]

anu bang pinag kaiba ng tatlo? nung naggawa kami ng mga panel eh magkahiwalay lagi yung electrical earth at instrument earth. tapos anu yung pinag kaiba technically ng clean earth sa dirty earth kung tawagin?

[ahlburuto]

 

 

[♪ ♫ ♫ ♪ ♪ ♪ ♫ ♫ ♫]

Ewan ko nga ba! dagdaggan ko pa, ang current daw flows from negative to positive yon daw talaga ang nangyayari, baliktad daw lahat yong conventional flow natin, dapat daw from negative to positive, hindi ko ma imagine papaano gagawa ng schematic na ganon eh! lalo na sa analogs...

[0b00000111]

agree ako jan, negative to positive ang flow...

pero ano ba yang clean earth at dirty earth? ngayon ko lang narinig yan ah...

[rommelpm]

 from experience:

clean earth - is an isolated grounding and is not connected to any existing electrical grounding or to the grounding of the building. usually, ibinabaon nang metal rod sa lupa then they measure the sorounding resistance at around 1 ohm. Yong signal ground nang panel should be connected to "clean earth"  while the Electrical ground should be connected to the building's grounding loop. The Equipment that requires this "clean earth"  are those that process data or information such as PABX, Firedetection Panels, Audio/Video system, Broadcasting equipments..etc.

dirty earth - is the building grounding loop, o ito yung earthing para sa buong building. Dirty ito dahil maraming ELECTRICAL NOISE which is emanated from different electrical equipment such as Electrical motors, Electronic Ballast, Electronic Transformers...etc   (So that is why we cannot use this grounding for our signal-ground)

Instrument Earth - Hmmm similar yata ito sa "Clean Earth".

 

[0b00000111]

from experience:

clean earth - is an isolated grounding and is not connected to any existing electrical grounding or to the grounding of the building. usually, ibinabaon nang metal rod sa lupa then they measure the sorounding resistance at around 1 ohm. Yong signal ground nang panel should be connected to "clean earth"  while the Electrical ground should be connected to the building's grounding loop. The Equipment that requires this "clean earth"  are those that process data or information such as PABX, Firedetection Panels, Audio/Video system, Broadcasting equipments..etc.

dirty earth - is the building grounding loop, o ito yung earthing para sa buong building. Dirty ito dahil maraming ELECTRICAL NOISE which is emanated from different electrical equipment such as Electrical motors, Electronic Ballast, Electronic Transformers...etc   (So that is why we cannot use this grounding for our signal-ground)

Instrument Earth - Hmmm similar yata ito sa "Clean Earth".

 

thanks for the info! pogi point for you!

[ahlburuto]

from experience:

clean earth - is an isolated grounding and is not connected to any existing electrical grounding or to the grounding of the building. usually, ibinabaon nang metal rod sa lupa then they measure the sorounding resistance at around 1 ohm. Yong signal ground nang panel should be connected to "clean earth"  while the Electrical ground should be connected to the building's grounding loop. The Equipment that requires this "clean earth"  are those that process data or information such as PABX, Firedetection Panels, Audio/Video system, Broadcasting equipments..etc.

dirty earth - is the building grounding loop, o ito yung earthing para sa buong building. Dirty ito dahil maraming ELECTRICAL NOISE which is emanated from different electrical equipment such as Electrical motors, Electronic Ballast, Electronic Transformers...etc   (So that is why we cannot use this grounding for our signal-ground)

Instrument Earth - Hmmm similar yata ito sa "Clean Earth".

 

thanks for the info... pogi points for you....

br

[ahlburuto]

point lang pala..... hindi points.... hehehehe...

meron kasing naging case dati nung nasa abroad ako. under commisioning yung isang turbina nun. nagtataka sila at bakit laging namamatay yung turbina, eh wala naman silang makitang fault nun. so ang napag diskitahan nila eh yung grounding nya. so ang ginawa nila eh binago nila yung grounding connection. dun ku nga narinig yung clean earth.... after nila na malipat yung grounding nun eh nag OK na yung takbo ng turbines....

salamat ulit sa info....

br

[0b00000111]

dirty earth pala kalimitan ng pinagkakabitan ko sa trabaho

[ahlburuto]

Sa abroad ku nga lang ito na encounter eh. dito sa local eh iba naman tawag. papano kaya ang electrical plan nito? parang mahirap ata ah.... kung tutuusin eh isa lang din naman yun, sa lupa din bagsak.... hehehehe

[0b00000111]

meron kasing naging case dati nung nasa abroad ako. under commisioning yung isang turbina nun. nagtataka sila at bakit laging namamatay yung turbina, eh wala naman silang makitang fault nun. so ang napag diskitahan nila eh yung grounding nya. so ang ginawa nila eh binago nila yung grounding connection. dun ku nga narinig yung clean earth.... after nila na malipat yung grounding nun eh nag OK na yung takbo ng turbines....

i want to learn something about this, ano daw ang cause bakit nagkaganoon?

[ahlburuto]

parang ang naging findings nila eh sobrang daming noise sa pinagkabitan nung electrical gounding ng turbina. mashado kasing sophisticated yung turbina na yun eh. rolce royce ata pa yung engine nun...

di ku lang alam kung pano nila nalaman yun.... ang tanda ku lang nun pa eh madami kaming load na motor nun. 30hp or 20hp ata ang isa eh 30-40pcs nun. sa oil refinery yun. sa mismong process..

[0b00000111]

i see... siguro sobrang grabe ng noise para di siya gumana....

[rommelpm]

i see... siguro sobrang grabe ng noise para di siya gumana....

Most of the time the main cause of noisy circuit is how the grounding path are being executed.

If you happen to have 5 devices that needs common grounding connection, each of the 5 devices should be terminated independently with each other to a common grounding (meaning kailangan mong mag batak nang cable from each device all the way to a common ground). This resembles a star configuration. Avoid a daisy chain-like grounding connection coz this is the main culprit!

Even in PCB designs, the grounding paths of each area should have an independent route all the way to the common point. Groundings for the signal, Load and Power should also have each separate routing...else suffer the consequences

[ferdie444]

from experience:

clean earth - is an isolated grounding and is not connected to any existing electrical grounding or to the grounding of the building. usually, ibinabaon nang metal rod sa lupa then they measure the sorounding resistance at around 1 ohm. Yong signal ground nang panel should be connected to "clean earth"  while the Electrical ground should be connected to the building's grounding loop. The Equipment that requires this "clean earth"  are those that process data or information such as PABX, Firedetection Panels, Audio/Video system, Broadcasting equipments..etc.

dirty earth - is the building grounding loop, o ito yung earthing para sa buong building. Dirty ito dahil maraming ELECTRICAL NOISE which is emanated from different electrical equipment such as Electrical motors, Electronic Ballast, Electronic Transformers...etc   (So that is why we cannot use this grounding for our signal-ground)

Instrument Earth - Hmmm similar yata ito sa "Clean Earth".

 

just an additonal info mga m8's:clean earth-normally used for low voltage devices,dirty earth -normally used for high voltage devices and instrument earth-normally used for instrument control system(all shielded wires twisted and connected together) .thanks and more power.......

[tony]

anu bang pinag kaiba ng tatlo? nung naggawa kami ng mga panel eh magkahiwalay lagi yung electrical earth at instrument earth. tapos anu yung pinag kaiba technically ng clean earth sa dirty earth kung tawagin?

ang instrument earth, or clean earth ay kadalansan gamit sa mga instrumento sa planta, gaya ng mga marshaling cabinets, interface panels na bahagi ng DCS, merong mga intrument loops na tinatawag, galing sa mga instruments sa field, patungo sa mga interface at marshalling panels, kadalasan ang invilved dyan ay yung mga instrumentation cables...

yung dirty earth or electrical earth naman ay para sa mga chassis ng panels, switchgears, transformers, or generators, or simpleng mga electrical panels, dito rin ikinakabit ang protective earthing cores ng mga power calbes.....

doon sa mga nagnanais makapag abroad bilang electrical or instrument technicians, importante na matutuhan ninyo ito.....

[dan.enriquez]

Ewan ko nga ba! dagdaggan ko pa, ang current daw flows from negative to positive yon daw talaga ang nangyayari, baliktad daw lahat yong conventional flow natin, dapat daw from negative to positive, hindi ko ma imagine papaano gagawa ng schematic na ganon eh! lalo na sa analogs...

ELECTRON flow - from negative to positive.
CONVENTIONAL flow - from positive to negative.