Introduction - modicme.files.wordpress.com€¦ · D 4788 Standard Test Method for Detecting Delaminations in Bridge Decks Using Infrared Thermography E 1186 Standard Practice for

Introduction

In order to classify the severity of the thermal anomalies recorded, the temperature

difference between similar components was used. Please note that with electrical

equipment, the measured temperature in degrees centigrade is likely to vary based on

the electrical load (amperes) on the equipment at that time, the surrounding ambient

temperature, and it’s emissivity value. It was beyond the scope of this study to

determine operating load levels at the time of our thermographic analysis.

The following criteria have been used to determine the priority of the corrective

maintenance scheduling required, based upon the temperature difference of like

components.

Temperature Rise Reference & Fault Category Table:

Fault Category Temperature Rise Recommendations

1 >50°C Must be repaired immediately

2 25-50°C Repair at the earliest opportunity

3 8-25°C Investigate during next scheduled maintenance

4 0.5C – 8C Advisory

Decisions on the priority, timing, and importance of repairing the thermal anomalies

found in the equipment that was scanned, is the responsibility of the end user and/or

his designated maintenance contractor. It is recommended that not only the

temperature rise be considered, in determining the prioritization of repairing the

thermal anomalies found, but also the criticality of the equipment/process.

Causes of Temperature Rise:

1. Loose or rusted contact.

2. Defective Materials, such as slag Cracks, excess porosity etc presented in materials.

3. Defective elements (while in manufacturing).

4. Dust, moisture and lack of proper ventilation.

5. Under rated wiring or material.

6. Excess operating Conditions than recommendations by manufacturer. etc..

7. Improper Design and Changes made in original design with out proper knowledge .

8.Phase Unbalance ,harmonics and noise etc ..

General Guidelines for Electrical Connections Inspection & maintenance :

1. Terminate power supply to the respected Electrical element and make sure there is no supply after power

termination.

2. Visual Inspect the Contacts or terminations for burns, scaling and loose contact etc.

3. Verify the element; it is as per the standard use like under rated, not as per the design or not as per the

manufacturer guidelines etc.

4. Remove the connection and clean with the Electrical contact cleaner and tighten well.

5. Verify the Current quality and Thermal signature after corrections made.

Recommended Practice : 1. Install and operate the Electrical equipments and its auxiliaries as per manufacturer guidelines.

2. Maintain proper ventilation, Heat sinks and House keeping.

3. Verify the product quality machine required while installation or change of elements.

4. Identify and monitor the electrical element life span and replace.

5. Make sure and Monitor Power Quality .

Equipment type Max. Time between inspections Transformers 12 months 440V motor control centers Air-conditioned 6-12 months Non-air conditioned or older 4-6 months Electrical distribution equipment 4-6 months Large motors* 12 months Smaller motors 4-6 months

References :

The following organizations publish infrared standards, infrared specifications and infrared

guidelines for performing infrared inspections and/or related testing.

American Society for Testing and Materials

100 Barr Harbor Drive, West Conshocken, PA 19428

Telephone: 610.832.9585 • Fax: 610.832.9555 • Website: www.astm.org

C 1060 Thermographic Inspection of Insulation Installations in Envelope Cavities of Frame Buildings

C 1153 Standard Practice for the Location of Wet Insulation in Roofing Systems Using Infrared Imaging

D 4788 Standard Test Method for Detecting Delaminations in Bridge Decks Using Infrared Thermography

E 1186 Standard Practice for Air Leakage Site Detection in Building Envelopes and Air Retarder Systems

E 1934 Standard Guide for Examining Electrical and Mechanical Equipment with Infrared Thermography

ANSI

11 West 42nd Street, New York, NY 10006

Telephone: 212.642.4900 • Fax: 212.302.1286

ISO 6781 Thermal Insulation – Qualitative Detection of Thermal Irregularities in Building Envelopes – Infrared Metho

Danish Technology Institute

Department of Energy Technology Grefersensvej, P. O. Box 141, DK-2630, Taastrup, Denmark

Telephone: 45.43.50.45.00 • Fax: 45.43.50.72.22

TTCTRAN.015 Guideline for Thermographic Inspection in Electrical Installations

https://www.astm.org/

InterNational Electrical Testing Association

3050 Old Centre Avenue – Suite 102, Portage, MI 49024

Telephone: 269-488-6382 • Fax: 269-488-6383 • Website: www.netaworld.org

NETA MTS-2001 Maintenance Testing Specification for Electrical Power Distribution Equipment and Systems

NETA ATS-1999 Acceptance Testing Specification for Electrical Power Distribution Equipment and Systems

International Organization for Standardization

Case Postale 56, CH-1211, Geneva, Switzerland

Website: www.iso.org

ISO Documents are available from ANSI please see their listing above.

National Fire Protection Association

1 Batterymarch Park, P. O. Box 9101, Quincy, MA 02269

Telephone: 800.344.3555 •Website: www.nfpa.org

NFPA 70B Recommended Practice for Electrical Equipment Maintenance NFPA 79 Electrical Standard for Industrial Machinery

http://www.netaworld.org/

http://www.iso.org/iso/home.html

http://www.nfpa.org/

AUTOCLAVE PUMP NO 2 CABLE CHAMBER

1/1

2/22/2017 10:23:40 AM °CSp1

Sp2

Sp3

Sp4

Sp5

Sp6

112.6

35.4FLIR0558.jpg FLIR E5 63947272

MeasurementsSp1 122.7 °C

Sp2 43.4 °C

Sp3 43.1 °C

Sp4 41.9 °C

Sp5 54.9 °C

Sp6 106.7 °C

ParametersEmissivity 0.95

Refl. temp. 20 °C

Distance 1 m

Atmospheric temp. 20 °C

Ext. optics temp. 20 °C

Ext. optics trans. 1

Relative humidity 50 %

2/22/2017 10:23:40 AM

FLIR0558.jpg FLIR E5 63947272

OBSERVATIONS & RECOMMENDATIONS :

*TEMPERATURE RAISE IN UPPER 3 -PHASE R - PHASE .

*TEMPERATURE RAISE IN LOWER 3-PHASE R-PHASE.

*IMMDIATE INSPECTION AND CORRECTION HAS TO BE DONE .

H.P COMPRESSOR

1/1

2/22/2017 10:18:15 AM °C

Sp1 Sp2

Sp3

84.7

35.0FLIR0547.jpg FLIR E5 63947272


Sp2 43.8 °C

Sp3 86.3 °C


Refl. temp. 20 °C

Distance 1 m





2/22/2017 10:18:15 AM



* B - PHASE TEMPERATURE HIGHER THAN OTHER PHASES .

* NEED TO BE INSPECTED AND CORRECT AS SOON AS POSSIBLE .

400A TP MOT MCCB TO PRINTING ROOM DRYER

1/1

2/23/2017 11:00:35 AM °C

Sp1

Sp2

Sp3

44.3

34.3FLIR0704.jpg FLIR E5 63947272


Sp2 41.6 °C

Sp3 40.6 °C


Refl. temp. 20 °C

Distance 1 m





2/23/2017 11:00:35 AM


OBSERVATIONS & RECOMMENDATIONS ;

* RAISE IN R - PHASE TEMPERATURE THAN OTHER PHASES .

* NEED TO CHECK AND CORRECT IN NEXT SCHEDULE MAINTENANCE .

SECONDARY PUMP 2

1/1

2/23/2017 2:50:01 PM °C

Sp1

51.2

29.8FLIR0777.jpg FLIR E5 63947272



Refl. temp. 20 °C

Distance 10 m





2/23/2017 2:50:01 PM



* MOTOR BODY TEMPERATURE IS NORMAL .