Lightning Arresters and Their Application

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Presentation transcript:

Lightning Arresters and Their Application (System Reliability Enhancement) 2011 SWEDE Conference Steve Brewer Hubbell Power Systems/Ohio Brass SWEDE Conference - April 2011

SWEDE Conference - April 2011 Outline Disconnector Reliability Line Insulator Protection Practical/Safety Topics Track Resistant Bracket SWEDE Conference - April 2011

Disconnector Reliability SWEDE Conference - April 2011

Proper Isolator Operation Ground lead separated Normal overcurrent sequence Protection operates System re-energized Voltage holds Service to end user restored Visual indication of failure SWEDE Conference - April 2011

Improper Isolator Operation Ground lead remains intact Normal overcurrent sequence Protection operates System re-energized System trips until lock-out occurs Service to end user NOT restored No visual indication of failure SWEDE Conference - April 2011

Resistor Graded Disconnector Time-Current Curve SWEDE Conference - April 2011

Capacitor Graded Disconnector Time-Current Curve SWEDE Conference - April 2011

Line Insulator Protection SWEDE Conference - April 2011

SWEDE Conference - April 2011 The Enemy SWEDE Conference - April 2011

Traveling Wave/ Overvoltage Protection Lightning hits mid-span Current divides and then propagates V = I x R

Surge Arresters - Concept Surge causes traveling voltage wave Voltage would be enough to flash-over insulation Surge arrester high resistance at L-G voltage Surge arrester low resistance at surge voltage Surge is diverted to ground Surge arrester high resistance again after surge Conduction time is too short for breakers to react

SWEDE Conference - April 2011 Case Histories SWEDE Conference - April 2011

SWEDE Conference - April 2011 National Grid Champion International Paper Co. Operates 363 days/year, 24 hours/day One interruption costs $50-100k No. 2 line - 115 kV, 70 years old Hired PTI Installed new OHSW Improved footing resistances SWEDE Conference - April 2011 10

National Grid 115 kV Line without Surge Arresters SWEDE Conference - April 2011

National Grid 115 kV Line with Surge Arresters SWEDE Conference - April 2011

Suspended Line Arrester Configuration

Typical Dead-End Line Arrester Configuration SWEDE Conference - April 2011

Practical/Safety Topics SWEDE Conference - April 2011

Practical Issues Too large as bad a too small Must use right rating and type Too large as bad a too small Lead length affects protection Conductor Size - Min. # 6 AWG Ground lead must be flexible Reuse of arresters Not recommended Testing of Arresters Thermal Imaging holds most promise DOT shipping considerations

Safety Issues Porcelain arresters Disconnector operation Most dangerous if do not blow up Disconnector operation Brings line voltage to base of unit

Track Resistant Bracket SWEDE Conference - April 2011