utility paralleling

12:33 Jul 31, 2011 

"Paralleling usually mean bumpless changover between two infeeds." is self-contradictory and is not in any way related to parallel operation, which is the subject of this question. As for "the entire utility is synchronized by definition", that is simply untrue in many practical sitations.

04:07 Jul 31, 2011 

You'll be surprised how many big utility customers have more than one utility infeed. Phase synchronization is not a big problem - the entire utility is synchronized by definition. Paralleling usually mean bumpless changover between two infeeds.

00:40 Jul 31, 2011 

'utility' is reserved, by convention, for the public power network, not the company's internal systems. No industrial power user, including those who have their own power generation facilities, are allowed to connect two incoming 'utility' feeds in parallel. Simply because they don't have the resources necessary to ensure proper synchronisation of any such inter-connection.

00:36 Jul 31, 2011 

pero no veo por qué dos "utility sources" no pueden estar en paralelo. En cualquier país con una red nacional puede haber cientos de empresas de energía en paralelo, lo cual, por otra parte, es la única forma en la que pueden funcionar. En el sistema sobre el que habla el texto de Myriam, la "red" es genérica y tratándose de una gran planta de gas es la red eléctrica interna.
+ saludetes

22:55 Jul 30, 2011 

lo que quiere decir el texto es que el sistema DMC permite la conexión en paralelo de varios grupos entre sí y con la red (pública o privada, no importa).
Saludetes del Étor.

22:21 Jul 30, 2011 

'utility paralleling' most certainly does NOT mean "connects in parallel two separate power sources from the utility (national network)". It refers to the paralleling of the locally-generated power from the diesel powered generating sets mentioned in the same paragraph with ONE source of utility supply.
Paralleling 3000 kVA locally-generated power supplies with the grid is dangerous enough (even though one has control over the phasing of the local source); paralleling two utility sources would be downright lethal (and most likely illegal) since it could do untold damage to third-party installations.

21:40 Jul 30, 2011 

Is when one connects in parallel two separate power sources from the utility (national network) - i.e., two medium or high voltage lines coming over different paths (for redundancy).