Genijalni matematičar opet odbija milion dolara

Isak666: ^^
Evo i Mrletov antipod.

mmix: Nije napredniji, samo je u to doba bio prakticniji za distribuciju.

Ivan Dimkovic: Pa nista to ne bi vredelo da iza toga nije stao Westinghouse.

I Beta je tehnicki bolji standard od VHS-a, pa opet - nije sama tehnologija preovladala.

A sto kaze mmix, nije AC nista napredniji, vec je samo u tom momentu bio efikasniji za distribuciju. Danas bi bilo daleko efikasnije koristiti DC, i eliminisati gomilu nepotrebnih konverzija sa gubitcima, a postoje i vrlo efikasni metodi prenosa high-voltage DC stuje.

Disadvantages

The disadvantages of HVDC are in conversion, switching, control, availability and maintenance.

The required static inverters are expensive and have limited overload capacity. At smaller transmission distances the losses in the static inverters may be bigger than in an AC transmission line. The cost of the inverters may not be offset by reductions in line construction cost and lower line loss. With two exceptions, all former mercury rectifiers worldwide have been dismantled or replaced by thyristor units. Pole 1 of the HVDC scheme between the North and South Islands of New Zealand still uses mercury arc rectifiers, as does Pole 1 of the Vancouver Island link in Canada.

In contrast to AC systems[citation needed], realizing multiterminal systems is complex, as is expanding existing schemes to multiterminal systems. Controlling power flow in a multiterminal DC system requires good communication between all the terminals; power flow must be actively regulated by the inverter control system instead of the inherent impedance and phase angle properties of the transmission line.[13] Multi-terminal lines are rare. One is in operation at the Hydro Québec - New England transmission from Radisson to Sandy Pond.[14] Another example is the Sardinia-mainland Italy link which was modified in 1989 to also provide power to the island of Corsica.[15]

HVDC is less reliable and has lower availability than AC systems, mainly due to the extra conversion equipment. Single pole systems have availability of about 98.5%, with about a third of the downtime unscheduled due to faults. Fault redundant bipole systems provide high availability for 50% of the link capacity, but availability of the full capacity is about 97% to 98%.[16]

High voltage DC circuit breakers are difficult to build because some mechanism must be included in the circuit breaker to force current to zero, otherwise arcing and contact wear would be too great to allow reliable switching.

Operating a HVDC scheme requires many spare parts to be kept, often exclusively for one system as HVDC systems are less standardized than AC systems and technology changes faster.

boxxter: Nije tako. Moram da priznam da ne mogu da se ne divim ljudima koji su pravi komunisti. Cenim tu odanost ideji, ti ljudi nemaju ni trun poboznosti u sebi, ne slave slavu, i uvek me je fasciniralo kad vidim petokraku na nekom grobu. To je znak da je ta odanost jaca i od smrti. Ne mogu da se ne divim tome.

mrle 011:

mozda si ti i na dobrom putu da jednog dana shvatis da izvorno hriscanstvo i komunizam pocivaju na istim idejama, koje nemaju veze sa zadriglim popovima u dzipovima i "domacinima" koji zidaju krstace od 100 metara dok narod nema sta da jede.

... niti pa i te slave imaju veze sa hriscanstvom, vec su zaostali paganski obicaji jos iz predhriscanskog doba.

nego ti lepo sutra preskoci jutarnje citanje kragujevackih pogleda, to je za budale, pa procitaj na primer ovo ...