Annual Report 2003-2004

NRIPower Systems Control & Dispatching Research CenterProject Title:Design and Implementation of fault-indicator for MV NetworksDepartment: Electronics & ControlProject Manager: B. AreziEmployer: Electronic AfzarAzma Co.Project Code: PCNAF01Project Staff: M. K.Hazrati, N.S. Manzar, B. Daneshkhah, H. BahadoriSummary:Fault Indicators have been very instrumental in firstly reducing the outage time (whenused to locate permanent faults) and secondly in reducing the number of faults per km(when used to locate momentary faults). This help utilities increase their quality ofsupply.Technical Specifications:1- General-Nominal Network Voltage : 11,20,33KV-Network Neutral : Earthed, Indirectly Earthed-Maximum Line Current: 800A2- Fault Detection-Earth Fault:10,20,30,40,50,60,80,100,120,140,160A-Over Current: 200,400,600,800A3- Sensing Time-60,100,200,300msec4-Output Contact Ratings (for scada)-250VAC/16A5-Power Supply-220VAC when MV exist-Internal Battery when Fault occurred (2.2 Ah)6- Environmental Conditions-Operating Temperature : -20 to 70°C-Storage Temperature: -40 to 85°C-Maximum Relative Humidity : 95%-EMI/RFI Protection : According to IEC-Protection Grade : IP237- Structure-Dimensions:-Weight: about 1kg-LED flashing frequency : 0.5Hz8-Reset-Manual: with push Button-Timer: 2,4 Hours- Voltage reset: 3 sec after MV Restoration78