COGENERATION PLANT SWITCHGEAR REPLACEMENT IMPROVES SAFETY AND RELIABILITY WHILE MAINTAINING SERVICE TO CRITICAL LOADS
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1 COGENERATION PLANT SWITCHGEAR REPLACEMENT IMPROVES SAFETY AND RELIABILITY WHILE MAINTAINING SERVICE TO CRITICAL LOADS Rachel Mueller, Mayo Clinic Timothy Coyle, PCT, Inc. Presented to: Minnesota Power Systems Conference November 5, MFMER slide-1
2 Franklin Heating Station Statistics Established in KPH steam, 12,000 tons cooling, 16.1 MW generation One of two plants serving the 7.2 million square feet of Clinic campus buildings Generation: Condensing turbines TG1 and TG2: Backpressure turbine TG3: Dual-fuel engines DG6 and DG7: 2.5 MW each 6.3 MW 2.4 MW each Distribution: Approximately 4 MW to buildings via 13.8 kv and 2400V feeders Emergency/standby power from DG6 and DG MFMER slide-2
3 161 KV Line To Byron MVA 37.5 MVA 161 KV Line To Silver Lake RPU Crosstown Substation BUS 6 Ozmun DAHLC Harwick ~7MW BUS 7 BUS 8 G TG6 6.4 MW BUS 5 To SMH Prospect Utility Plant ~2.2MW Mayo ~4.3MW Gonda Hilton/Gugg RMH ~3.7MW Charlton/ Harwick ~6.5 MW Harwick ~1.4MW BUS 3 BUS 4 Franklin Heating Station G TG2 2.5 MW G TG3 6.3 MW G TG1 2.5 MW 2014 MFMER slide-3
4 2014 MFMER slide-4
5 Justification for Replacement Age and Condition Inadequate Working Clearance Short Circuit Ratings Exceeded Protection Shortcomings Many breakers in series Long current differential circuits Complex hard-wired load shedding scheme 2014 MFMER slide-5
6 Pre-Project Short Circuit Duties 2014 MFMER slide-6
7 Upgraded Short Circuit Duties 2014 MFMER slide-7
8 Design Constraints No Additional Space Available on Turbine Floor or in Proximity Maintain Crane Access to Basement through Grating in Front of Existing Switchgear Maintain Service to Loads and Generation Capacity During Installation and Commissioning Narrow Time Window for Taking TG3 Out of Service Highly Congested Cable Space Below Existing Switchgear 2014 MFMER slide-8
9 Selected Option: Three 13.8 kv Buses (Sync Bus) 2014 MFMER slide-9
10 161 KV Line To Byron MVA 37.5 MVA 161 KV Line To Silver Lake Charlton/Harwick ~6.5 MW BUS 6 Ozmun DAHLC Harwick ~7MW BUS 7 BUS 8 G TG6 6.4 MW BUS 5B BUS 5A To SMH ~2.2MW Mayo Prospect Utility Plant ~4.3MW Gonda Hilton/Gugg RMH ~3.7MW Proton ~2MW + Buildout Block 12 ~MW?? Sync BUS 3 BUS Z BUS 4 Franklin Heating Station Harwick ~1.4MW G TG2 2.5 MW G TG3 6.3 MW G TG1 2.5 MW 2014 MFMER slide-10
11 161 KV Line To Byron MVA 37.5 MVA 161 KV Line To Silver Lake Charlton/Harwick ~6.5 MW BUS 6 Ozmun DAHLC Harwick ~7MW BUS 7 BUS 8 G TG6 6.4 MW BUS 5B To SMH Block 12 ~MW?? ~2.2MW Mayo Prospect Utility Plant ~4.3MW Gonda Hilton/ Guggenheim Sync BUS 3 BUS Z BUS 4 RMH ~3.7MW Proton ~2MW + Buildout Franklin Heating Station BUS 5A Harwick ~1.4MW G TG2 2.5 MW G TG3 6.3 MW G TG1 2.5 M 2014 MFMER slide-11
12 Protection System Criteria Provide Primary and Backup Protection for all Buses and Circuits Provide Zoned Primary Protection of Buses and Tie Circuits Utilize Micro-Processor Based Relays Consistent with Existing Installed Base Provide Metering Data for All Circuits over Ethernet Implement Simplified Under-frequency Load Shedding 2014 MFMER slide-12
13 Protection System Design Based on GE UR Platform: F60, F35, G30 Protection Schemes: Buses: Traditional High Impedance Differential, MIB Tie Circuits: Directional Comparison Permissive Tripping with Backup Time Overcurrent, F60 Load Feeders: Time Overcurrent, F60 and F35 Generator: C with Redundant G30s IEC Communications for Tie Circuit Protection Redundant Fiber Optic Networks Monitoring at Engineering Workstation 2014 MFMER slide-13
14 Protection Network Diagram 2014 MFMER slide-14
15 Network Detail at Bus 3 and Bus Z 2014 MFMER slide-15
16 Tie Feeder Protection Logic (F60 - Z5) 2014 MFMER slide-16
17 Load Shed System Design Implemented from RPU ties at Buses 7 and 8 through Bus 5B to Bus Z Manual Enable/Disable switch at FHS Separate from RPU at Buses 7 and 8 on UF and RCOF Arm feeder load shedding at each plant based on separation from RPU and Enable/Disable switch position Shed plant chiller load and feeders based on underfrequency setpoints IEC Signals: Enable/Disable status from Bus Z to Bus 7 Separation from RPU from Bus 7 to Bus Z Separation from RPU from Bus 5B to Bus Z 2014 MFMER slide-17
18 Load Shed System Design 161 KV Line To Byron MVA 37.5 MVA 161 KV Line To Silver Lake Breaker R4 or R5: Trip for f <= Hz AND df/dt > Hz/s Shed Plant Load at f <= Hz G TG6 BUS 7 BUS 8 No Shed at Bus 5B BUS 5B Shed Plant Load at f <= Hz Mayo Hilton/ Guggenheim RMH Harwick Block 12 Sync BUS 3 BUS Z BUS 4 Shed Feeders at Staggered Frequencies G TG2 2.5 MW G TG3 6.3 MW G TG1 2.5 M 2014 MFMER slide-18
19 Bus 7 Load Shed Logic Trip RPU Tie 2014 MFMER slide-19
20 Bus 7 Load Shed Logic: Shed Plant Loads 2014 MFMER slide-20
21 Bus Z Load Shed Logic 2014 MFMER slide-21
22 Bus Z Load Shed Logic 2014 MFMER slide-22
23 DEMOLITION, INSTALLATION AND COMMISSIONING Reliability Expectations Tasks What led to things going smoothly? 2014 MFMER slide-23
24 Mayo Clinic Campus Utility Expectations Zero Electrical or Utility Outages 6 Week Turbine Outage Plant Staff expected to Maintain Plant Operations New Gear but Existing Infrastructure 3 Phases of Project Required Temporary Connections 2014 MFMER slide-24
25 TASKS End to End Relay Testing Electrical Switching Procedures Operation of Electrical System 2014 MFMER slide-25
26 End-to-End Relay Testing TYPICAL INSTALLATION REMOTE BUS OUR INSTALLATION REMOTE BUS GOAL: Function test system components simultaneously Settings Communication Fiber Optics Network Coordination GPS PLANT PLANT 2014 MFMER slide-26
27 TEST STATION Created Test Stations to Simulate End-to-End Installation REMOTE BUS TEST STATION Tested Protective Relaying Elements Tested Load Shed Signals Verified Functionality and Operation of Gear PLANT 2014 MFMER slide-27
28 On-Line Live Verification using GE UR Software At project completion we used On Line Monitoring to verify Remote I/O 2014 MFMER slide-28
29 Electrical Switching Procedures Live-Transfer Switching Done Off Hours (night/weekend) Procedures Allowed Safer Practice for Switching Load Insured Safety of Personnel - LOTO Updated Procedure Led to Zero Switching Outages 2014 MFMER slide-29
30 Electrical Switching Procedures 2014 MFMER slide-30
31 TIME AND EFFORT DRAFT PROCEDURE WRITING 1 PERSON ~4 HOURS WALKDOWN 3 PERSON ~1 HOUR FINAL PROCEDURE AND REVIEW 1 PERSON ~ 1 HOUR 21 PROCEDURES = 336 HOURS DEDICATED TO WRITING AND PERFORMING SAFE SWITCHING PERFORMING SWITCHING PROCEDURE 4 PERSON ~ 1 HOUR before 4 PERSON ~ 1 HOUR after 2014 MFMER slide-31
32 Operation of the Electrical System Configuration was Complex During the Installation Process Electrical System was Changing Daily and was Difficult to Operate Management Utilized Tools to Protect from Operation Error 2014 MFMER slide-32
33 Simplified One-Lines 2014 MFMER slide-33
34 What led to things going smoothly? PRIORITIZING Safety First Reliability PLANT PREPARATION Utilized other project opportunities to prepare Field verification CULTURE Communicate openly Team 2014 MFMER slide-34
35 NEW GEAR 2014 MFMER slide-35
36 NEW GEAR Bus Diff CT 2014 MFMER slide-36
37 What Happened? We Got Comfortable Started with a Schedule Change. We Didn t Allow for any Mistakes to Occur Failed to Plan for Human Error 2014 MFMER slide-37
38 Questions? 2014 MFMER slide-38
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