Sunday Aug 20 2017

T & T Inspection And Engineering Sdn Bhd

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Electrical anomaly / failure symptom will become catastrophic if left unattended. Electrical failure symptom will causes electrical short circuit (phase to phase, phase to ground) power tripping / interruption, discoloration / burn mark / sting smell at the electrical component, high electrical billing and production disturbance; more over a catastrophic electrical power failure will lead to, fire, damage to equipment and property, or loss of life.

The introduction of the predictive maintenance via NDT technologies (infrared thermography, acoustic ultrasound, EMF partial discharge locating, power quality measurement, high & low frequency vibration monitoring, power solution and etc) are able to detect, monitor and trigger for an appropriate time to repair / countermeasure on a specific equipment to reduce the total system failure and loss, maximize the usage and economic value of the equipment, provide sufficient time management for proper schedule shut down / repair, as well as, to reduce the repair and resuming cost of the related equipment.

A.    High Voltage Electrical Equipment (over 1000V AC)

  • a. Type of Equipment:
    i. Circuit breaker – Vacuum (VCB), SF6 Gas (GIS), Oil (OCB)
    ii. Ring Main Unit – SF6 Gas, Oil
    iii. Power Transformer – 6.6kV, 11kV, 22kV, 33kV, 132kV, etc
    iv. High voltage cable – 11kV, 33kV, 132kV, etc
    v. Overhead line and pole, etc
  • b. Failure mode
    i. Corona partial discharge
    ii. Tracking partial discharge
    iii. Arcing partial discharge
    iv. Partial discharge causes by high moisture / acidic environment
    v. Insulation component damage / crack / aging
    vi. Overloading / under rating
    vii. Mechanical vibration due to looseness
    viii. Power quality issue – harmonics / swell & sag, flicker
    ix. Poor workmanship / improper material
    x. Etc.

B.    Low Voltage Electrical Equipment (50V~1000V AC)

  • a.    Type of Equipment
    i. Main switch board (MSB), Sub-switch board (SSB), distribution board (DB), sub-distribution board (Sub-DB)
    ii. Circuit breaker – Air circuit breaker (ACB), molded circuit breaker (MCCB), mini circuit breaker (MCB), ELCB, RCCB, etc.
    iii. Thermal overload relay / timer control
    iv. Contact switch / control
    v. Capacitor bank / reactor
    vi. Low voltage transformer / Auto Transformer
    vii. Cable and wiring
    viii. Etc.
  • b.    Failure mode
    i. Bad connection / contact
    ii. Overloading / under rating
    iii. Malfunction / crack / damage due to aging
    iv. Oxidization due to high moisture condition / low quality component
    v. Power quality issue – harmonics / swell & sag, flicker
    vi. Poor workmanship
    vii. Etc.

C.    Extra Low Voltage Electrical Equipment (< 50V AC)

  • a.    Type of Equipment:
    i. Electronic Printed Circuit Board Assembly (PCB)
    ii. Battery Bank
    iii. Integrated Circuit Board (IC)
    iv. Resistor
    v. Jumper & wiring
    vi. Etc.
  • b.    Failure mode
    i. Defective component
    ii. Bad connection
    iii. Low voltage battery
    iv. Overloading / under rating
    v. Poor workmanship
    vi. Etc.

Samples of Electrical Failure – Infrared Thermography

Samples of Electrical Infrared Thermography
Faulty at breaker cast resin potential transformer

Bad connection Electrical Wiring
Infrared Thermography Infrared Thermography
Bad connection at transformer bushing connection

Bad cable connection Infrared Thermography
Bad cable bushing connection at switchgear

Bad cable connection Infrared Thermography Services
Bad cable connection at breaker’s cable compartment

Burn control cable connection Infrared Thermography Services
Burn control cable connection

Burn control cable connection Infrared Thermography Services
Burn cable at the air-cond panel thermal overload relay

Samples of Electrical Failure – Ultrasound

Partial discharge due to insulation deterioration

Partial discharge due to high moisture environment

Samples of Electrical Failure – Partial Discharge Locating

Partial discharge mapping
 

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