Equity benchmark Sensex dropped over 250 points in early trade on Friday tracking losses in banking and financial stocks amid negative cues from global markets.The 30-share BSE index was trading 281.86 points or 0.55 per cent lower at 51,042.83. Similarly, the broader NSE Nifty was quoting 87.25 points or 0.58 per cent down at 15,031.70.PowerGrid was the top loser in the Sensex pack, shedding around 3 per cent, followed by ICICI Bank, NTPC, Bajaj Auto, Maruti, Bajaj Finance and SBI. On the other hand, HUL, Reliance Industries, Bharti Airtel, L&T, M&M and HCL Tech were among the gainers.In the previous…