* Dollar index <.DXY> slides to 3 1/2-mth low of 76.812
* High oil prices likely to keep Fed policy loose
* Expectations of a hawkish ECB supports euro
(Adds quote, detail, updates prices)
By Naomi Tajitsu
LONDON, Feb 28 (Reuters) - The dollar hit a 3-1/2-month low versus a currency basket on Monday on speculation the Federal Reserve will lag other central banks in raising interest rates to counter inflation risks stoked by rallying oil prices.
The dollar index, which tracks the greenback's performance against a basket of major currencies, skidded to 76.812 <.DXY>, its lowest level since Nov. 9.
Traders said the move below the February trough of 76.881 had triggered fresh-selling by "model" accounts, which are based on computer-generated trading recommendations.
Analysts said the dollar would stay under selling pressure ahead of Congressional testimony from Fed Chairman Ben Bernanke on Tuesday and Wednesday.
Investors suspect he will stick to his recent economic assessment that the recovery is strengthening but still not enough to bring about a significant improvement in the jobs market, suggesting the time is not ripe for U.S. rates to rise.
This would contrast with the European Central Bank, whose policymakers have been warning against inflation risks. The ECB holds a policy meeting this week, and some say it may suggest it is preparing to exit its ultra-loose policy, opening the way to raising rates.
"The Fed has singled itself out among the major central banks in deciding to maintain very accommodating monetary policy despite improving data," said Adam Myers, senior currency strategist at Credit Agricole.
"The market is anticipating Bernanke will maintain his line from his testimony two weeks ago. If that's the case, it would put the Fed in a very different light to all other G10 central banks, and that is the main dollar driver."
While ECB officials have focussed on the impact of higher inflation, the Fed is keeping an eye on growth and have set a high bar for tweaking their $600 billion bond buying program.
The euro <EUR=> rose around 0.6 percent versus the dollar to $1.3845, its strongest since the start of the month. Technical analysts said a break of the euro's year-to-date high at $1.3862 was needed for added momentum.
Traders said a UK clearer was a heavy buyer of euros through the morning, while offers were cited ahead of an option barrier at $1.3850.
Along with the view that rock-bottom U.S. rates will tarnish the appeal of U.S. assets, the dollar has been stung by rising oil prices as investors fret the U.S. economy is more vulnerable to higher energy costs, given its strong reliance on consumer spending for growth.
Oil prices rose more than $1 per barrel on Monday as protests in Oman fuelled wider concern about security of supply from the Middle East after uprisings in Libya dramatically reduced exports from North Africa. [
]"The ECB sees rising crude as an upside risk to inflation rather than the Fed's view that it will be negative for growth. This is increasing the risks of a near-term overshoot for the euro," said Lee Hardman, currency analyst at BTM-UFJ.
High inflation risks were highlighted by data showing final euro zone inflation data for January came in at 2.3 percent year-on-year, slightly softer than estimates but hovering at a 27-month high. [
]"The dollar is likely to stay weak for now as investors expecting central banks to hike rates in response to higher oil prices favour the euro, pound and Swedish krona," said UBS FX analysts in a note.
Still, an ongoing rise in the euro could make the single currency susceptible to profit-taking as the latest data showed currency speculators had boosted bets in favour of the euro to the highest since October in the week ended Feb. 22. [
]The dollar was flat against the Swiss franc at 0.9285 francs <CHF=>, near a record low of 0.9229 hit on EBS last week.
The safe-haven Swiss currency has rallied this month on concerns that uprising in Egypt and Libya could spread to other countries in the Middle East the North Africa.
The dollar was steady at 81.88 yen <JPY=>. Traders reported a layer of strong bids down to 81.00 cushioning the dollar. (Additional reporting by Neal Armstrong; Editing by Ron Askew)