I bought a sd card with 32 gb for my phantom 3 standard it is a 10 as recommend with 80 speed but my drone says invalid card when installed. I tried to format it but say format failed and it don't initialize. What could b the problem?

There's been an ongoing issue with the Sandisk Ultra SD card. See these threads: Sandisk Ultra threads.

So that specific cards should be avoided. There are others that may not meet the Phantom requirements.

A few of the threads above show recommended/tested cards and this link also helps: Memory Cards from PhantomHelp

I am sorry but you might need another SD card since the current sd card is not compatible.