procurement of carbon brush holders and different grade carbon brushes used in rotor ground fault detection and shaft grounding in bhel make generator at unit no . 5 , 1x500mw , at sgtps , mppgcl , birsinghpur . procurement of carbon brush holders and different grade carbon brushes used in rotor ground fault detection and shaft grounding in bhel make generator at unit no . 5 , 1x500mw , at sgtps , mppgcl , birsinghpur . , two-layer carbon brush used in ground fault detection for excitation field circuit of 500 mw generator . dimensions: 8 x ( 10+10 ) x 30 mm grade- asg1+hm100 ( with nylon holder ) , double layer carbon brush used in shaft grounding of generator rotor ( right ) side , grade- ag20+eg5u dimension- 8x ( 10+10 ) x32 mm , double layer carbon brush used in shaft grounding of generator rotor ( left ) side , grade- ag20+eg5u dimension- 8x ( 10+10 ) x32mm , double brush holder for 500mw generator ( model- ncbp-017 ) , brush holder for brushless exciter of 500 mw turbo generator ( model- ncbp-022 )