NLR ELECTRIC MURRAY HYDRO PLANT NORTH LITTLE ROCK, ARKANSAS

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1 NLR ELECTRIC MURRAY HYDRO PLANT NORTH LITTLE ROCK, ARKANSAS January, 2013 Infrared Inspection Report NLR Electric Murray Hydro Plant Company Contact James Bray Project: CHARTER OAK DRIVE, LITTLE ROCK, AR PHONE: & FAX:

2 ORDER OF REPORT CONTENTS 1: Data To Facilitate Understanding & Utilizing Scan Report 2: Scan Results Overview & Action Taken Form 3: Identified Faulting Conditions, Information & Photographs 4: List Of Facility Equipment Identified By The Customer Representative & Notations Of Faulting Conditions Found DISCLAIMER This report and the recommendations contained in it are based upon conditions and practices observed and information made available to United Spectrographics personnel. This report does not purport to list all hazards or faulty conditions. It is not intended to indicate that other hazards or faulty conditions do not exist. Severity ratings in the report are based on the criteria shown in this report and are intended as guidelines only. No responsibility is assumed for the control of the facility s condition, maintenance practices or correction of conditions indicated herein. By issuing this report, neither United Spectrographics nor any of its employees makes any warranty, expressed or implied, concerning the contents of this report. Furthermore, neither United Spectrographics nor any of its employees shall be liable in any manner (other than liability that may be expressed in any policy of insurance that may be issued by United Spectrographics) for personal injury or property damage or loss of any kind arising from or connected with this inspection or failure to inspect.

3 Utilizing Report Contents Included in this report are Photographs and Thermographs of problem areas found during our recent Infrared Inspection of your facility. Each problem area picture is accompanied by: Date Location Information Temperature Calculations Color-coded Temperature Intensity and/or Condition Significance Data A Brief Comment Relating The Item In The Photograph To Its Corresponding Thermograph Suggested Corrective Recommendations. In most cases, problems (faults) found will be listed according to the date and order that they were located, rather then by significance or priority, as we feel that you and/or your personnel can best judge this, keeping in mind circuit importance and thermograph intensity. Thermal intensity is indicated by use of a color-coded data inserts that locate a fault s position on the standard electrical failure curve. The color of the insert represents the temperature range of the hottest item, or a portion of the item's circuitry, pointed out in the thermograph. The temperature ranges which the colored inserts represent are grouped as follows: INSERT Red Orange Yellow Green Temperature Range 70ºC/126ºF and higher above Ambient Operating Temp. 40ºC/72ºF to 69ºC/124ºF above Ambient Operating Temp. 25ºC/45ºF to 39ºC/70ºF above Ambient Operating Temp. *10ºC/18ºF to 24ºC/43ºF above Ambient Operating Temp. ( * See page 4)

4 Determining Cost Effective Responses Electrical equipment failures generally follow a standard mechanical/electrical failure curve. Dividing the failure curve into temp. ranges and locating a problems position on the curve allows us to indicate the probable time to its failure. Knowing a problems probable time to failure allows you to make a cost effective response to the problem areas that we locate. Below is a depiction of the electrical fault failure curve with the thermal intensity ranges and the colors that we assign to faults detailed in our reports. STANDARD ELECTRICAL FAULT FAILURE CURVE (Does Not Include Area In Blue) MINOR INTERMEDIATE SERIOUS CRITICAL DEVICE TEMP IS AMBIENT, BUT DEVICE IS EITHER FAULTY OR UNSAFE. 10ºC * 18ºF 25ºC 45ºF 40 C 72ºF 70 C 126ºF AMBIENT TEMP YEARS MONTHS MONTHS TO WEEKS WEEKS TO NOW FAULTY EQUIP Built In Trend Monitoring When yearly scans are accomplished, report results allow you to trend monitor your electrical equipment without having to cross reference previous report findings. If a previous years problem is not repaired it will show up again in the current scan report and its current intensity range indicates a current effective response.

5 Defining Total Temperature and Ambient Operating Temperature And Explanation For Their Use Total Temperature: Total Temperature = Ambient Operating Temperature + Fault temperature Allows you, the customer, to evaluate possible damage to equipment. Leads fail between 90ºC/194ºF and 110ºC/230º Phenolic fails around 200ºC/392ºF Transformers and Motor Insulation failure temperature depends on insulation class rating. Contacts start to fail around 130ºC/266ºF Ambient Operating Temperature (AOT*) for Infrared Scanning Purposes: Temperature within a device container (Box or Cabinet) that is not directly affected by faulting component = Normal Equipment Operating Temperature Contained By Box or Cabinet. If there is no container (Example: Device mounted to a wall) it is the temperature adjacent to the device not affected by the fault. Allows you, the customer, to determine if device will operate at intended amperage. Most switchgear is rated to operate at approximately 40ºC/104ºF (Industrial) to 50ºC/122ºF (Marine) If AOT is enough above normal rated temperature, either of the following conditions can cause an unanticipated trip. 1. An intermittent high load. 2. A minor (Green) or intermediate (Yellow) fault. Report pages with photographs: PH stands for Visible Light Photograph TH stands for Infrared Light Thermograph * AOT stands for Ambient Operating Temperature Both black & white and color infrared thermographs are presented to better depict the fault condition.

6 In addition to the corrective response time frame suggested below and the failure curve located on the previous page, you may want to consider using the military standard responses presented below. Military Standard For Evaluating Faults Located In Electrical Equipment Utilizing Temperature Data Obtained With Infrared Imaging Equipment: Temperatures rise above Ambient Operating Temperature: *10ºC/18ºF to 24ºC/43ºF component failure unlikely, but corrective measures required at next scheduled routine maintenance period or as scheduling permits. (Green Label) 25ºC/45ºF to 39ºC/70ºF component failure probable, unless corrected. (Yellow Label) 40ºC/72ºF to 69ºC/124ºF component failure almost certain, unless corrected. (Orange Label) 70ºC/126ºF and above component failure imminent. Immediately inform the person responsi ble for continued operation of equipment. (Red Label) Note: United Spectrographics uses a Blue Label to indicate faults that require attention due to either ambient temperature (Ex: Phase Not Operating), faulty equipment elements or unsafe conditions. * Note: Temperature conditions below 10ºC/18ºF rise above AOT are not considered significant enough to record and are usually not included in the reports. Fault Correction Recommendation When Our Source Assessment Is Inaccurate: When a fault is indicated in a connection or component and examination by your electrician does not turn up a loose connection or faulty component where we have indicated, a fault does exist. The electrician should continue to investigate the next connection or component to be found in the direction that the heat is coming from until a source is located. Example: If a molded case breaker line side lead connection lug is indicated as a fault source and is found to be secure, but not frozen in place, look for a loose connection or sign of over temp. in the lead holder lug.

7 SCAN RESULTS OVERVIEW PROMPT ATTENTION ITEMS: Because of: 1. The intensity or heat level indicated at the time of the scan. 2. Deterioration caused by excessive temperature not present at the time of the scan. 3. Physical condition irregularities observed at the time of the scan. We recommend that the following faults be given prompt attention: Faults: None Noted Items With Asterisks Have High Total or Ambient Operating Temperatures. United Spectrographics January, 2013

8 SUMMARY OF FINDINGS FAULTS BY CATEGORY NUMBER OF FAULTS FAULT NO./ITEM NO. MINOR 0 0 INTERMEDIATE 1 1/24 SERIOUS 0 0 CRITICAL 0 0 SERIOUS 0 0 Number of items located at facility: 144 Number of faults: 1

9 ACTION TAKEN NLR Electric Murray Hydro Plant North Little Rock, Arkansas January, 2013 Fault # Item # Category Repaired Monitor Date Name 1 24 Intermediate

10 PROJECT: CUST REP: Eddie SCAN REP: Russell Garner DATE: 01/17/13 LOCATION: Outside Control Room (Behind Switchgear #2) VFD Control Cabinet For: Unwatering Pump #2 Bottom Motor Control Contact Block PH # 1 > ITEM: SOURCE: TEMP: Cø of Contact Block Load side lead connection lugs. Temp. of connections and lugs range to: 47ºC / 116ºF Total Temp - 14ºC / 57ºF AOT = 33ºC / 59ºF above AOT. TH # 1 > COMMENTS Abnormal heat is being generated in motor control connections. See yellow arrows in PH#1 and TH#1. TH # 1 > Loose and/or corroded contact areas. Clean, inspect and re-secure. TEMPERATURE ABOVE AOT 33 C / 59 F

11 AREA/EQUIPMENT LIST Following is a list of the electrical equipment located at the NLR Electric Murray Hydro Plant, North Little Rock, Arkansas, facility and data relating to its operating condition at the time the scan was performed. NOTE: Items noted as visually inspected were not operational or show no visible load at the time of the inspection. No. Equipment Oper. Visually Inspected EQUIPMENT LIST Fault # CONTROL ROOM 1 Relay Panel 1 X 2 Relay Panel 2 X 3 Relay Panel 3 X 4 Relay Panel 4 X 5 Relay Panel 5 X 6 Relay Panel 6 X 7 Relay Panel 7 X 8 Control Panel 1 X 9 Control Panel 2 X 10 Control Panel 3 X 11 Control Panel 4 X 12 Control Panel 5 X 13 Control Panel 6 X 14 Control Panel 7 X OUTSIDE CONTROL ROOM 15 DC Battery Cabinets X /208 VAC Cabinet A X /280 VAC Cabinet B X 18 DC Cabinet A X 19 DC Cabinet B X 20 Lighting Panel X 21 LP2 From LP1 X

12 No. Equipment Oper. Visually Inspected 22 (2) Lighting Transformers X Fault # 23 Unwatering Pump 1 Control Cabinet X 24 Unwatering Pump 2 Control Cabinet X 1 SWITCHGEAR 1 & 750 KVA Transformer 25 Compartment 1A X 26 Compartment 1B X 27 Compartment 1C X 28 Blank X 29 Compartment 2A X 30 Compartment 2B X 31 Compartment 2C Diesel Generator X MCC-1 32 Blank X 33 Draft Tube Unwatering Pump 1 X 34 Fire Pump #1 X 35 Fire Pump #2 X 36 Service Air Compressor X 37 Generator Space Heater Unit 1 X 38 Service Water Pump 1 X 39 Welding Receptacles X 40 MISC Power and Lighting XFMR A X 41 Generator Step Up Transformer Cooling Supply 1 X 42 Governor Oil Pump 1A X 43 Cooling Water Pump 1 X 44 Stairway Supply Fan SF 1 X 45 Lube Oil Transfer Pump 1 X 46 Unit 1 Generator Bearing Oil Circulation Pump X 47 Supply Fan SF 1A X

13 No. Equipment Oper. Visually Inspected 48 Waste Water Pump 1 X 49 Exhaust Fan EF 1 X 50 Governor Air Compressor 1 X 51 Supply Fan SF 3 X 52 Hub Oil Tank Pump X 53 Guide Bearing Oil Lift Pump X 54 Welding Receptacles X 55 Battery Charger X 56 Governor Oil Pump 2B X 57 Powerhouse Sump Pump 1 X 58 Duct Heater DH 3 X 59 Duct Heater DH 1 X 60 Oil Separator X 61 Control Room AC 1 X 62 Elevator Breaker X 63 Crane 1 X 64 Deck Hoist X 65 Jockey Fire Pump X 66 Governor Oil Pump 2C X 67 Service Water Strainer 1 X 68 Blank X 69 Blank X 70 Crane Intake X 71 Sewage Grinder X 72 Speed Increaser Oil Circulation Pump X Fault # SWITCHGEAR 2 & 750KVA TRANSFORMER 73 Compartment 1A X 74 Compartment 1B X 75 Compartment 1C X 76 Blank X

14 No. Equipment Oper. Visually Inspected 77 Compartment 2A X Fault # 78 Compartment 2B X 79 Compartment 2C X 80 Compartment 2D X MCC-2 81 Blank X 82 Draft Tube Unwatering Pump 2 X 83 Service Air Compressor 2 X 84 Generator Space Heater Unit 2 X 85 Guide Bearing Oil Lift Pump X 86 Governor Oil Pump 2A X 87 GSU XFMR Cooling Supply 2 X 88 MISC Power and Lighting XFMR B X 89 Welding Receptacles X 90 Crane 2 X 81 Unit 2 Service Water Pump X 92 Unit 2 Cooling Water Pump X 93 Cooling Water Pump Standby X 94 Lube Oil Transfer Pump 2 X 95 Sump Pump 2 X 96 Emergency Oil Skimmer X 97 Exhaust Fan EF 2 X 98 Battery Charger 2 X 99 Welding Receptacles X 100 Duct Heater DH 4 X 101 Duct Heater DH 2 X 102 Chilled Water Pump #1 X 103 Control Room AC 2 X

15 No. Equipment Oper. Visually Inspected 104 Governor Air Compressor 2 X Fault # 105 Supply Fan SF 2 X 106 Waste Water Pump 2 X 107 Service Water Strainer 2 X 108 Supply Fan SF 1B X 109 Generator Bearing Oil Circulation Pump 2 X 110 Hub Oil Tank Pump X 111 Spare X 112 Spare X 113 Governor Oil Pump 1B X 114 Governor Oil Pump 1C X 115 Fire Pump 2 X 116 Fire Pump 1 X 117 Future X 118 Speed Increaser Oil Circulation Pump 2 X 119 Blank X LOWER LEVEL 120 Unit 1 SCR Cabinet X 121 Unit 2 SCR Cabinet X 122 Unit 1 Gen. Breaker X 123 Unit 2 Gen. Breaker X 124 Fire Cabinet 2 X 125 Fire Cabinet 1 X 126 Cooling Water Control Cabinet X 127 Elevator Control Cabinet X 128 Unit 1 Lube Oil Pump X 129 Unit 2 Lube Oil Pump X

16 No. Equipment Oper. Visually Inspected 130 Service Air Compressor Control Cabinet 1 X Fault # 131 Service Air Compressor Control Cabinet 2 X 132 Waste Water Control Panel X 133 Unit 1 Governor Pump Motor Control X 134 Unit 2 Governor Pump Motor Control X 135 Unwater Pumps Control Cabinet X 136 Sump Pump Local Control Cabinet X 137 Sewage Grinding Control Cabinet X 138 Generator Crane Disconnect (Left) X 139 Turbine Crane Disconnect (Right) OUTSIDE 140 Unit 1 GOAB X 141 Unit 2 GOAB X 142 Unit 1 Bus Work X 143 Unit 2 Bus Work X /115KV Transformer X