# Talk:Extra high tension

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## Limit of the voltage?

Can anyone check if the limit of the voltage is 25000 or 380000 volts? The one I encountered in high-school only goes to 5000 volts as maximum. Thanks. --Lemontea 12:51, 9 October 2005 (UTC)

Answer from Lucian Toma (Romania) - Assistant Professor, at University "Politehnica" of Bucharest, in the field of Power Systems
It is not correct to say tension for voltage. Tension is used for mechanical force and voltage for electromotive force.
The voltage levels are classified as follows:
low voltage : less than 1000 V
medium voltage : it depends from country to country; the nominal voltages in Romania are: 6 kV, 10 kV, 20 kV and 35 kV. The limits of 35 kV for overhead electrical lines and 6-10 kV for underground electrical lines are specific for networks with isolated neutral. However, due to the expanding of distribution networks, grounded neutral networks via resistor or arc-suppression coil have been developed.
So, in Romania medium voltage ranges from 1 kV to 35 kV
High voltage : from 35 kV up to 275 kV, including the nominal voltages 110 kV and 220 kV (differs from country to country)
Extra high voltage : higher than 275 kV (in Romania the nominal voltages are 400 kV and 750 kV, and in UCTE - Europe - the common voltage is 380 kV)
Thanks for your answer, two things: a)Correct me if I'm wrong, but my physics textbook did use the term "Extra High Tension" (New Physics at Work, Book 2-Electromagnetism and Atomic Physics, Oxford University Press), though I admit I feel odd upon seeing that and attempted to check the fact here. Anyway to confirm that? b)How're we going to merge this information into the article? --Lemontea 10:35, 24 January 2006 (UTC)
Evidence that, according to the US Dept. of Agriculture, EHV is 345 - 765 kV with UHV (Ultra HIgh Voltage) beyond that: [1].
Andy G 18:18, 15 November 2006 (UTC)

## Removed

Contributed 12 October 2006 by 61.10.12.224:

It is an apparatus in laboratory.

Contributed 10 November 2006 by 59.93.240.220:

needs of EHT
----------------
EHT is needed in colour and B/W tv.eht is applied at a point on the aquadag's coating at the output of picture tube.this EHT (18kv for B/W & 25kv for colour tv) provides electron beams from electron gun enough speed to strike and excite phosphor dot.

## CRTs?

I don't believe CRTs should be classified as EHV/EHT device. I've never heard them described that way, and they violate the definition of a EHV supply as given in the article, that is, they do not put out more than 275 KV.

24.18.249.218 04:27, 11 October 2007 (UTC) Shane

EHT is the normal acronym for the accelerator supply to a television or CRO CRT. Agree it doesn't conform to the power engineering usage. Andrewa (talk) 22:59, 6 July 2011 (UTC)

## Reinstated

Not sure whether to mark this as a stub or as a DAB. Either way it needs work, but the merge that saw it made a redirect didn't work and valuable material just disappeared. Andrewa (talk) 23:13, 6 July 2011 (UTC)

## Merge proposal

• Support - But only if all information is included in the merge, so other editors can then use it in the new article (i.e. - add references, expand, improve). Northamerica1000(talk) 13:50, 10 January 2012 (UTC)