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IT (isolé côté production)

English translation: Impedance grounded

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
French term or phrase:IT (isolé côté production)
English translation:Impedance grounded
Entered by: Eutychus
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09:36 Sep 6, 2006
French to English translations [PRO]
Tech/Engineering - Energy / Power Generation
French term or phrase: IT (isolé côté production)
I understand there to be three types of earthing, TT (terre-terre) T-N (terre neutre) and IT... Wikipedia says this is "isolé côté production". Would that be "Insulated Neutral earthing"?
Eutychus
Local time: 08:50
Impedance grounded
Explanation:
From my notes:
Described below are five recognized power grounding schemes. In international terminology, the Grounding Conductor (G) is termed the “Protective Earth Conductor (PE)”.
TN (Terra Neutral) Power Systems are those systems having one point directly connected to Ground (Earth) by Protective Earth Conductors. There are three types of TN power systems:
TN-S (Terra Neutral-Separate) - Separate Neutral and Protective Earth conductors exist throughout the system.
TN-C-S (Terra Neutral-Combined-Separate) – Neutral and Protective Earth functions are combined in a single conductor in part of the system.
TN-C (Terra Neutral-Combined) – Neutral and Protective Earth functions are combined in a single conductor throughout the system.
TT (Terra Terra) Power Systems are those having one point directly connected to Ground (Earth), but the exposed conductive parts of the installation are connected to grounding electrodes independent of the grounding electrodes of the power system.
IT (Impedance Terra) Power Systems have no direct connection to Ground (Earth), the exposed conductive parts of the installation are directly connected to Ground. Also called an impedance grounded system."
[www.itic.org/technical/ite_grnd.pdf]


Impedance grounded systems have a resistor between the neutral point of the source and ground. The idea is to limit the current of a ground fault to a low value, typically less than 10 amps, so that a ground fault can be indicated and located, but the system can continue to operate. Neutrals are prohibited in impedance grounded systems in North America. They are permitted in some European countries (IT-AN systems). Figure 4 illustrates an impedance grounded source (sometimes called high impedance grounded).

http://www.activepower.com/files/products/CSUPS_Grounding_Pr...
Selected response from:

xxxBourth
Local time: 08:50
Grading comment
thanks Bourth
4 KudoZ points were awarded for this answer

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Summary of answers provided
4Impedance groundedxxxBourth


  

Answers


19 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5
Impedance grounded


Explanation:
From my notes:
Described below are five recognized power grounding schemes. In international terminology, the Grounding Conductor (G) is termed the “Protective Earth Conductor (PE)”.
TN (Terra Neutral) Power Systems are those systems having one point directly connected to Ground (Earth) by Protective Earth Conductors. There are three types of TN power systems:
TN-S (Terra Neutral-Separate) - Separate Neutral and Protective Earth conductors exist throughout the system.
TN-C-S (Terra Neutral-Combined-Separate) – Neutral and Protective Earth functions are combined in a single conductor in part of the system.
TN-C (Terra Neutral-Combined) – Neutral and Protective Earth functions are combined in a single conductor throughout the system.
TT (Terra Terra) Power Systems are those having one point directly connected to Ground (Earth), but the exposed conductive parts of the installation are connected to grounding electrodes independent of the grounding electrodes of the power system.
IT (Impedance Terra) Power Systems have no direct connection to Ground (Earth), the exposed conductive parts of the installation are directly connected to Ground. Also called an impedance grounded system."
[www.itic.org/technical/ite_grnd.pdf]


Impedance grounded systems have a resistor between the neutral point of the source and ground. The idea is to limit the current of a ground fault to a low value, typically less than 10 amps, so that a ground fault can be indicated and located, but the system can continue to operate. Neutrals are prohibited in impedance grounded systems in North America. They are permitted in some European countries (IT-AN systems). Figure 4 illustrates an impedance grounded source (sometimes called high impedance grounded).

http://www.activepower.com/files/products/CSUPS_Grounding_Pr...


xxxBourth
Local time: 08:50
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 472
Grading comment
thanks Bourth
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