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NSPCL O&M MEET-2019

NSPCL O&M MEET-2019. INSTALLATION OF MOTOR PROTECTION RELAY:- A CASE STUDY ON PERFORMANCE IMPROVEMENT & FAULT DIAGNOSIS. Samriddhi Singh Manager Electrical Maintenance NSPCL Rourkela. SINGLE LINE DIAGRAM AHP MCC. Supply from SSS-B. Supply from SSS-A. ASH HANDLING MCC-1. Incomer-2.

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NSPCL O&M MEET-2019

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  1. NSPCL O&M MEET-2019 INSTALLATION OF MOTOR PROTECTION RELAY:- A CASE STUDY ON PERFORMANCE IMPROVEMENT & FAULT DIAGNOSIS Samriddhi Singh Manager Electrical Maintenance NSPCL Rourkela

  2. SINGLE LINE DIAGRAM AHP MCC Supply from SSS-B Supply from SSS-A ASH HANDLING MCC-1 Incomer-2 Incomer-1 Bus Coupler Series-1 Series-4 Series-6 Series-2 Series-3 Series-5 Supply from U#1 USS Supply from U#2 USS ASH HANDLING MCC-2 Incomer-2 Incomer-1 Bus Coupler FAWP-1 BAWP-4 FAWP-6 FAWP-2 BAWP-3 FAWP-5

  3. SINGLE LINE DIAGRAM CT MCC CW TRF-A 6.6KV/415V CW TRF-B 6.6KV/415V Supply from CWPCC Sec-2 Supply from CWPCC Sec-1 Incomer-2 Incomer-1 Bus Coupler CTVF-5 CTVF-1 CTVF-2 CTVF-3 CTVF-4 CTVF-6 CTVF-7 CTVF-8 CT MCC-1 & 2

  4. PROBLEM • Motor NTS • Motor burnt and smell observed. • Motor tripped while running. • Smoke observed from MTB. • Flashover occurred in module • Power fuse blown. 70 such incidents in past 3 years from 2016-2018 making an average of around 23 incidents per year.

  5. ...AND THE BIGGEST PROBLEM Supply from SSS-A Supply from SSS-B INCOMER TRIPS...... ASH HANDLING MCC-1 Incomer-2 Incomer-1 Bus Coupler Series-1 Series-4 Series-6 Series-2 Series-3 Series-5 COOLING TOWER MCC Incomer-2 Incomer-1 Bus Coupler CT-1 CT-2 CT-3 CT-4 CT-5 CT-6 CT-7 CT-8 RISK OF UNIT TRIPPING.....

  6. Situation after tripping • Operation-parameters control,systemrevival, valve operation etc. • Maintenance-Accurate fault diagnosis , flashover, motor replacement and rewinding etc. • MTP person was also not in peace.

  7. REASON Only Protections available :- • Power Fuse • Thermal Overload Relay During Earth Fault /Single Phasing???........

  8. SOLUTION MOTOR PROTECTION RELAY PROCUREMENT:- • Inst. overcurrent protection • Thermal overload protection • Phase reversal • Current Unbalance • Earth Fault • Stall rotor • Locked Rotor • Phase loss protection.

  9. Drives Covered..... • Ash series pumps-Lower & upper deck • Fly ash water pumps • Cooling Tower fans • Seal air blower • Fire fighting pumps • Belt conveyors

  10. CHALLENGES DURING INSTALLATION Space constraint.

  11. CHALLENGES DURING INSTALLATION • Very limited period shutdown. • Modifications in control circuit wiring and bus bar. • Relay testing and setting at lab • Ensuring utmost safety.

  12. THE FINAL PICTURE.... 54 numbers of numerical relays in 2 months

  13. THE COST ECONOMICS.... L&T switchgear spare procurement- Rs. 10 Lakhs. Cost of one ash handling motor-Rs. 6 Lakhs(approx) Cost of rewinding one motor- Rs 0.5 Lakhs(approx) P PO NO. 4100003176 Dt. 02.02.2018 Supply of Relay,Current transformer & Retrofitting charges – Rs. 7,87,500/-

  14. ADVANTAGES • No. Of incidents. • Savings in procurement of spares. • Accurate fault diagnosis. • Ease of operation. • Reliability and availability.

  15. Core Values • Safety and Environment Sustainability. • Performance. • Integrity. • Respect and Trust. • Innovation and Excellence. • Team Work

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