Instrument names at beginning of staves

[liang seng]

Hi, I would like to know how to lengthen the horizontal distance between 
instrument names at the beginning of staves from the left part of the 
staves? The instrument names overlap the braces generated by "GrandStaff". I 
tried inserting spaces after the instrument names like so
\set Staff.instrument = "Instrument      " but it doesn't work. Is there a 
solution to this?
Thank you.
Yours sincerely,
Seng Liang.