Jason Harchick, P.E. Sr. Manager, System Planning and Protection Ryan Young Manager, Substation Engineering

Transcription

1 DLC s Brady IIB Project Jason Harchick, P.E. Sr. Manager, System Planning and Protection Ryan Young Manager, Substation Engineering

2 Project Need In 2007, PJM and Duquesne Light Company (DLC) transmission studies identified and confirmed a potential transmission system reliability issue a second contingency or N-2 thermal overload could occur in 2012 and a single contingency or N-1 thermal overloads could occur in 2022 Violation of DLC planning criteria DLC s Proposed 3-Part Transmission Solution: Construct new Brunot Island-Brady-Carson underground 345kV line Build a new 345/138kV substation at Brady Street Loop existing Carson-Oakland 138kV into the new substation & recable Transmission details of DLC s Brady Project shared at the PJM s August 2007 Transmission Expansion Advisory Committee meeting Three Baseline projects approved by PJM Board of Managers in October

3 Evolving System Need In 2011, changes in system conditions and projected demand resulted in a revised scope for the project Brady Street Substation was tabled Brunot Island Carson 345kV circuit still required Converting and re-cabling 69kV to 138kV circuits still required Project required in-service date adjusted to 6/1/2016 Transmission details shared at PJM s September 2011 Transmission Expansion Advisory Committee meeting In 2013, the need for 345kV shunt reactors was identified to address high voltage Shunt reactors planned for Brunot Island Substation and tapped from the Brunot Island-Carson 345kV circuit Transmission details shared at PJM s May 2013 Transmission Expansion Advisory Committee meeting 3

4 Brady IIB DLC s Brady Project was broken into multiple phases Phase I - ISD: 6/1/2012 Convert Forbes substation from 69kV to 138kV and two (2) 69kV High Pressure Fluid Filled (HPFF) circuits to 138kV Phase IIA - ISD: 6/1/2013 Establish a Carson-Oakland 138kV circuit utilizing former 69kV HPFF circuit Phase IIB - ISD: 6/1/2016 Establish Brunot Island-Carson 345kV (302) circuit Install two (2) 200MVAR, 345kV shunt reactors 4

5 Brady IIB Circuit Route Underground: 9 miles Overhead: 1.3 miles 5

6 High Pressure Fluid Filled (HPFF) Circuits DLC began using HPFF circuits in the 1950s Brady Project maximized the use of DLC s HPFF circuits Benefits of HPFF Utilization of existing infrastructure Proven track record at DLC Small footprint Ratings can be increased through oil circulation and forced cooling 6

7 High Pressure Fluid Filled (HPFF) Circuits Smart Pig A Smart Pig was used to test the HPFF pipe before recabling Common inspection tool in the oil and gas industry Uses magnetic flux leakage to identify corrosion or variations in the pipe wall thickness 7

8 Shunt Reactors Certain contingencies resulted in voltage above acceptable limits in future studies DLC Operations Center was experiencing high voltage during valley load periods Similar operational challenges across PJM territory Reactors sized and located to support voltage ranges across all demands Transient study performed to identify negative transient and harmonic conditions Determination for Independent Pole Operated (IPO) breakers to switch shunt reactors Control scheme employed to eliminate resonance condition when cable is de-energized and eliminate zero miss condition during energization Additional bus capacitance added to reduce Transient Recovery Voltage (TRV) 8

9 Shunt Reactors Transient Study Results Current Through Carson 345kV Breaker When Energizing Cable from Carson with Line Reactor In-Service ( Zero Miss ) Source: Transients Analysis for the Brunot Island to Carson 345 kv Cable Final Report Mitsubishi Electric Power Products, Inc., February

10 Shunt Reactors Transient Study Results Voltage on De-energized Brunot Island - Carson 345kV Circuit with Shunt Reactor In-Service Source: Transients Analysis for the Brunot Island to Carson 345 kv Cable Final Report Mitsubishi Electric Power Products, Inc., February

11 Shunt Reactors Transient Study Results Voltage Across the Shunt Reactor Circuit Breaker with Various TRV Control Capacitances when Interrupting Reactor-Limited Fault Source: Transients Analysis for the Brunot Island to Carson 345 kv Cable Final Report Mitsubishi Electric Power Products, Inc., February

12 Engineering and Construction Overview Engineering/Construction: 5 years June 2011 to 2016 Project Cost: $83.8M Brady IIB: $65M Shunt Reactors: $19M Over 31,600 Duquesne Light Hours Brady IIB - 17,900 Reactors - 13,700 12

13 Engineering and Construction Overview Brunot Island Substation 345kV Yard Expansion Carson Substation 345kV Yard Expansion Tecumseh Substation Establishment Major Equipment Installed (2) 345kV Shunt Reactors (6 single phase units) + 1 spare unit 143,000 Linear Feet of 2500MCM (HPFF) 345kV cable (7) 345kV Gang Operated Breakers (2) 345kV IPO Breakers 13

14 Shunt Reactor Design Core Design Slate Discs Rods for Clamping Stacked Core Source: GE/Alston Active Part Process Submittal, December,

15 Shunt Reactor Design Core Design Insulation Around Core Lowering Winding Around Core Lowering Top Yoke Source: GE/Alston Active Part Process Submittal, December,

16 Shunt Reactor Design Shipping Configurations 16

17 Shunt Reactor Design Assembly in Process 17

18 Brunot Island Substation Pre-Construction No kv Bus 18 No kv 350 MVA Auto. Arsenal (306) Collier (304) CS 186a No kv Bus 325 #3-345 kv Bus Arsenal (305) # kv Bus #2-138 kv Bus Forbes (Z-46) Legend 345 kv Equipment 138 kv Equipment 324 Arsenal (305) Arsenal (306) 320 Crescent (331) Brunot Island 345 kv Substation

19 Brunot Island Substation Pre-Construction 19

20 Brunot Island Substation Post Construction No kv Bus 20 No kv 350 MVA Auto. Arsenal (306) CS 186a No kv Bus 325 #3-345 kv Bus # kv Bus #4-345 kv Bus 200 MVAR Shunt Reactor Arsenal (305) Arsenal (306) Carson (302) Crescent (331) Brunot Island 345 kv Substation 330 Collier (304) Arsenal (305) #2-138 kv Bus Forbes (Z-46) Carson (302) Legend 345 kv Equipment 138 kv Equipment 341

21 Brunot Island Substation Post Construction 21