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Yes when you delegate steem power (SP) that shows up as a negative value in your steem power delegation and so that amount of steem power is not part of your voting power as long as it is delegated. However I believe minnow booster is currently paying about 45% yearly interest and you receive SBD payments on a daily basis. There's also about 1 week waiting period to get the SP back when your delegation contract ends. Similar to a real world CD (Certificate of Deposit) Account.

Thx for the info, I 've got some SP delegated at minnowbooster.

How can I delegate steem power.

You can delegate steem power to minnowbooster here:
https://www.minnowbooster.net/delegate
You can lease steem power from minnowbooster here:
https://www.minnowbooster.net/lease

good to know, thnk you

Thanks allot