Mobius Institute Category 1Chapter 2

Mobius Institute Category 1Chapter 2

Infrared Thermography

Electric Motor Testing

Oil Analysis

Wear Particle Analysis

Condition MonitoringInfrared Thermography

Infrared Thermography

Infrared Thermography

Concept

Devices

• Spot Radiometer

• Infrared Camera

Application

• Mechanical Equipment

• Electrical Equipment

Heat Transfer Modes

Conduction

Convection

Radiation

Radiation

Conduction

Convection

Infrared Camera

Infrared Camera

1. Emitted

Heat

2. Reflected

Heat

3. Transmitted

Heat

Conclusion

Conclusion

Reliable measurement

Advantage/disadvantag

e

CONDITION MONITORINGELECTRIC MOTOR TESTING

ELECTRIC MOTOR TESTING

MOTOR LISTRIK : energi listrik ---> energi mekanik

Tujuan dilaksanakannya electric motor testing umumnya adalah untuk

memastikan kondisi kesehatan dari mesin tersebut.

1. mendeteksi kondisi insulation.

2. mendeteksi electrical imbalances.

detect electrical condition

1. static/off-line test

2. dynamic/on-line test

Static/off-line test

Static/off-line test :

Performed when motor off or shutdown

Usually performed once a year.

Quality assurance tool.

New base-line of future trending.

Troubleshooting

Off-line test include :

Traditional test method

Insulation resistance testing (meg-ohm)

Polarization index

High potential resistance testing

Surge comparison testing.

Static/off-line

test

Traditional test

method

Insulation

resistance

testing

Polarization

index

High potential

resistance

testing

Surge

comparison

testing

• Memerlukan aplikasi tegangan

yang signifikan

• Menekan sistem insulation

• Tes insulation menggunakan

dc voltage

• Mengukur resistansi pada

insulation

• Variasi dari tes IR

• PI= R10/R1

• Polarization current

Tes resistansi menggunakan arus

DC tegangan rendah, tujuan

utamanya mendeteksi high

resistance joints, loose

connection, broken connection,

dan direct short

• Memonitor kondisi belitan dan

insulasi.

• Tes turn-to-turn, coil-to-coil,

phase-to-phase insulation.

DYNAMIC/ON-LINE TEST

On-line test :

Performed when motor still on or operating

Can be performed daily, weekly, or monthly.

Condition monitoring.

Digunakan untuk mendeteksi

Winding shorts between conductor and coil

Winding contamination

Insulation to ground faults

Air gap faults, including eccentric motor

Rotor faults

Current analysis with current clamp.

Flux coil.

DYNAMIC/ON-LINE TEST

Current spectra.

Collecting current data on each power leg at the panel using current clamp.

Comparing the current from each leg.

Current spectrum can detect probability of broken rotor bars, uneven air gap, bowed rotor.

Flux coil

Used on the motor.

Collect data of the flux field generated by motor.

Indicate potential problems at the windings.

CONDITION MONITORINGOil analysis and Wear particle analysis

Oil Analysis

Oil Analysis adalah tes yang dilakukan untuk mengetahui kondisi dari pelumas. Dan untukmengetahui apakah terdapat kontaminasi pada pelumas tersebut.

- Apakah masih bisa melakukan tugasnya dengan baik?

- Apakah ada kandungan air atau kotoran?

- Apakah ada logam atau unsur lain yang memberikan peringatan dini dari keausan.

Tes yang dapat ditambahkan :

- Visual Analysis

- Smell

Oil Analysis

Advantages

Dapat menentukan kondisi bahan aditif

pada pelumas.

Dapat mendeteksi adanya kontaminasi

dari fluida lain.

Dapat membaca adanya keausan partikel

sampai 6 mikron.

Disadvantage

s

Tidak dapat membaca adanya “Abnormal

Wear Particle”

Tidak dapat menentukan sumber dari

keausan.

Wear Particle analysis

Corrosive Wear

Sliding Wear

Cutting Wear

Oil Analysis vs Wear Particle Analysis