Applied to Equipment Instruction Number R Class-Group Generate Date: 11 March 2004

Size: px

Start display at page:

Download "Applied to Equipment Instruction Number R Class-Group Generate Date: 11 March 2004"

Katherine Foster
6 years ago
Views:

1 Page 1 of 7 Planned Maint. Type Turbo file - Job Group ZI Lead Trade Applied to Equipment Instruction Number R Class-Group Generate Date: 11 March 2004 Isolation Zone Supersedes References J:\PS\mep\Maintenance Program\Reliability Centered Maintenance\Revelstoke\Turbo Files\Turbo Today\REV RCMT V9.mdb Technical File # Prepared by: Revision History: Reviewed by: Accepted by: EOR: Work Performed by: Date: W.O. # REV - 5CB1-4 GAS SYSTEM Gas Pressure Low gas pressure will result in a flashover. age/vibration. - Check SF6 gas pressure. - Specified minimum = 490 kpa SAI: Low gas pressure SF6 _Found Left A kpa B kpa C kpa REV - 5CB1-4 HYD SYSTEM Oil Level and Leaks REV - 5CB1-4 HYD SYSTEM Pressure Gauge Reading Low oil level or leaks due to failure of seals. Effects are possible alarm and subsequent trip with low oil pressure. age/vibration/wear. Low pressure will cause an alarm and then a trip. Failing these, the breaker will open on its own. age/vibration/wear. - Check the oil level. Specified level beween lower 1/3 of site glass to 1/2 site glass - Check for significant leaks. SAI: low oil level or leaks - Check the oil pressure gauge reading while energized - Specified between 33.3 Mpa and 33.8 Mpa. SAI: Low oil pressure Oil level Found Left A B C A Mpa B Mpa C Mpa

2 Page 2 of 7 Brush Temperature Pit Humidity High friction or an exceeded brush current density limit will cause overheating. The effects are damage to the brushes and ultimate failure. Contamination/OL. Low humidity will result in pulverization of the brushes and too high a humidity will result in deterioration of the slip ring. Moisture (lack). - Complete temperature measurement for 5 brushes each on A, B, C, D rings and record the highest temperature on each ring. - Brush temperature should not exceed 115 deg C with maximum field current. SAI: Brush temp too high! - Check the humidity in the brush gear pit with hand held hygrometer. - Specified hygrometical conditions are between 6 and 15 g of H2O per cubic meter of air. SAI: Input Required Temp in deg C a b c d g water/cubic meter air Pit Temperature Temperature inside of the brushgear pit exceeds 50 deg C. The effects are damage to the ring insulation and insulation on the shunts. Friction. - Check the temperature of the brushgear pit with hand held thermometer. - Specified maximum is 60 deg C. - Check temperature differential between intake and outlet. - Specified differential temperature is deg C.\ - Check for brush Arcing and Sparking.. SAI: Input Required Brushgear pit temp. deg C Differential temp. deg C

3 Page 3 of 7 Slip Ring Temperature A deg C B deg C REV - GEN TERM EQU GROUND SWITCH 16GD1/2/3/4 - Operation Test High friction or an exceeded brush current density limit will cause overheating on the slip ring. Also, breakdown of patina on the slip ring will cause heating. The effects are damage to the brushes, slip ring and slip ring insulation and resulting in failure. failure. Contamination/OL. Will not operate. Fail to generate if the ground switch fails in the closed position. mechanical. - Complete temperature measurement of A, B, C, D rings and record the temperatures. - Ring temperature should not exceed 105 deg C with maximum field current. SAI: Input Required Before making adjustments and performing the inspection on the ground switches, the power springs must be blocked. See maintenance and instruction manual for the procedure. - Check that springs are securely attached before attempting to operate. - Close Operation - Open Operation Note that the handle has to be completely turned (full stroke) to make all 3 switches operate. Two switches may operate and not the 3rd. C deg C D deg C SAI: fails to operate REV - GENERATOR AIR COOLERS Radiators - Leaking / Mounting Tubes or header plate leaking water due to decreased wall thickness form corrosion. Corrosion. Visually inspect for evidence of leaks around each of the 8 radiators and associated piping. SAI: leaks found

4 Page 4 of 7 REV - GENERATOR LIFT PUMP SYSTEM Check Valve Worn out seal or broken spring causes valve to not be able to hold pressure allowing oil to flow backward. May cause thinner hydrodynamic oil wedge on bearing. Wear & Tear. - While generating unit is running (with lift pump off) check to see if the motor is turning backwards. - Check oil pressure while generating unit running. Alarm is set at 1000 psi. SAI: pump and motor are turning backwards. Running pressure psi REV - INTAKE GATES INTAKE HEATERS Hydraulic Piping Heat Tape REV - INTAKE GATES INTAKE HEATERS Space Heater & Thermostat BREATHER Piping/Dess Breather BREATHER Silica Gel CONSERVATOR Air Bag Gauge Reduced power from HPU caused by heat tape not operating and oil becoming less viscous. age, physical damage. low temperature in intake HPU room caused by heater or thermostat not operating age/vibration/fault. Broken pipes/valves Mechanical Stress. Change in colour from blue to pink. Moisture Content. Gauge shows air bag is empty. mechanical. Include in operators Zonal Inspection to feel tape in the winter months. SAI: Pipe not warm, heat tape not working Include in operators Zonal Found Left Inspection to check room temperature in the winter deg C months. Room temp setting should be xx deg. C SAI: room temperature too cold, heater does not work Visually inspect for broken pipe or breather. SAI: Broken pipe or breather. Visually check silica gel color with respect to original blue colour. Also check condition of the canister assembly. SAI: Colour change from blue to pink. - Check air bag gauge. SAI: air bag gauge not showing Reading: bag is empty A B C

5 Page 5 of 7 CONSERVATOR Conservator level Low oil level Leaking. Reading: A B C EXTERIOR (VISUAL) Audible Inspection EXTERIOR (VISUAL) Visual Inspection GAS RELAY Gas Accumulation HV BUSHING Oil Level OIL - INSUL. Oil Temp Excessive or change in noise level vibration. Oil or water leak, discoloured external paint, fluid leaking on transformer from other source. heat/vibration. Relay shows gas accumulation. Arcing/Winding Breakdown. Low oil level. Could result in tracking, hydrogen generation leading to bushing failure and possible explosion. Leaking. Oil temp not consistent with other phases; Problem with gauge or high oil temp. mechanical. Zonal inspection by an operator of the conservator oil level gauge. SAI: Low oil level in the conservator. - Operator to walk around each unit and listen for abnormal or excessive noise. SAI: Abnormal or excessive noise. Walk around each of the three phases and complete visual inspection. SAI: oil or water leak, discoloured paint, fluid leaking form other source. - Checks and record gas accumulation in gas relay. SAI: Gas accumulation is high > 200 cc. - Check oil level. SAI: Oil level low -Check oil temperature gauge on the unit. Normal temperature is 25 deg C. SAI: Oil temp gauge reading is not consistent with other two phases. Temperature: A deg C B deg C C deg C

6 Page 6 of 7 OIL PUMPS Inspect Run Lights OIL PUMPS Oil Pumps PIPING/VALVES Piping/valves/coupling TANK Main Tank WINDINGS Winding Temp Display WINDINGS Winding Temp Gauge One of 2 run lights are not lit on front cover of control panel, when unit in operation. loss of pump/bulb failure. Unusual noise from oil pump bearings age/heat. Leaks in piping, at valves or couplings. Vibration/Wear. Leaks or major rupture. Age/Fault. Winding RTD temperature reading is not consistent across 3 phases. Calibration/Mechanical Failure. Winding temperature reading is not consistent across 3 phases. Calibration/Mechanical Failure. - Check that the two red run lights (PL1/2) on the front of the control panel are lit when the transformer is in operation. The run light will not be lit if either the bulb is burned out or there is no oil flow (differential contoller 80Q1 or 80Q2). There should be a cooler trouble alarm if there is no oil flow in either of the coolers. SAI: One of two lights not lit on running unit. - Complete audible inspection of the oil pumps. SAI: excessive noise - Inspect couplings, piping, and valves for leaks. SAI: leaks - Inspect tank. SAI: - Leak or Rupture (visual); low conservator level alarm. Check RTD winding temperature (26WT) in the control room. Normal winding temperature is 40 deg C. SAI: Winding RTD temperature not consistent with other 2 phases. Check winding temperature at the transformer (49WA). Normal winding temperature is 40 deg C. SAI: Winding temperature not consistent with other 2 phases. Oil Pump: #1_ _#2 A B C Temperature: A deg C B deg C C deg C Temperature: A deg C B deg C C deg C

7 Page 7 of 7 AIR BLOWER Air Blower Operation Operator zonal inspection - check if blower operates when it is supposed to (50-70%) Rough load zone operation_ Yes No Incorrect operation of blower causes excessive unit vibration during rough load zone operation. Adjustment/malfunction. AIR BLOWER Butterfly Valve DRAFT TUBE Draft tube door & beam hatches SHAFT SEAL Cooling Water (S/C) Leaky valve causing increased S/C make-up air. Blower would turn backwards from air/water mixture leaking through leaking valve. Wear & Tear. Water leaking from door/hatches due to damaged seal. Likely due to: adjustment, dirt, seal failure, wear. Overheated carbon seal due to inadequate cooling water flow during sync-condense operation. dirt/debris. During Unit S/C operation, check that blower is not turning backward intermittently. Consider monitoring SAC runtime during unit S/C on OI. SAI: Increasing S/C compressor run time trend Operator Zonal inspection. Inspect door and beam hatches for leakage. SAI: Poor seal, leaking. Check cooling water flow set to 42 USGPM. Part of Operator daily check sheet. SAI: clogged strainer Evidence of leaking Yes No REV - GOVERNOR CONTROLS Distributing Valve Hunting REV - GOVERNOR CONTROLS RPM Gauge Governor hunting leads to increased servomotor, distributing valve wear, increase jockey pump run time. Adjustment/age/malfunction. Incorrect indication of unit RPM Adjustment/malfunction. Visual inspection of distributing valve oscillations. - Check gauge while unit is operating, should read 100%. SAI: off by more than +/- 2%

REVELSTOKE - 1 YEAR DOWN. Applied to Equipment Instruction Number R Class-Group Generate Date: 11 March 2004

REVELSTOKE - 1 YEAR DOWN. Applied to Equipment Instruction Number R Class-Group Generate Date: 11 March 2004 Page 1 of 7 Planned Maint. Type Turbo file - Job Group 1Y-DOWN Lead Trade Applied to Equipment Instruction Number R Class-Group Generate Date: 11 March 2004 Isolation Zone Supersedes References J:\PS\mep\Maintenance