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Transformer Testing

When a transformer fails, it’s a massive let-down, considering the severe consequences on operating costs and labour. However, most failures can be prevented, if steps are taken in advance, which also helps maximize its lifespan. Our TransCARE® program can help assess the health of your transformer and predict faults well in advance.

TransCARE®

Transformer Condition and Reliability Evaluation Program

TransCARE® is a comprehensive diagnostic procedure merging our knowledge from testing 500+ transformers of up to 250 MVA with all relevant IEC, IEEE and ISO standards.

Why choose TransCARE®?

TransCARE® can predict practically any electrical or mechanical fault well in advance. It offers several USPs like
Safe operational period for a transformer is specified
Incipient defects are identified, along with their severity
Corrective actions are recommended and can be planned in advance
Healthy transformers are identified so that unnecessary overhauls are avoided
All tests and results are in accordance with relevant standards

TransCARE® can detect all
possible failure modes in transformers like

TransCARE® can detect all possible failure modes in transformers like

On-Line TransCARE®

Loose or corroded connections

Insulation defects

Temperature related defects

Off-Line TransCARE®

LEVEL I

Moisture ingress

Contamination

Loose or corroded connections

Interturn shorts

Increased losses

Bushing faults

Insulation aging

Insulation defects

LEVEL II

Moisture ingress location - paper or oil

Contamination

Interstrand shorts

Insulation aging

Insulation defects

Mechanical deformation

OLTC defects

Key technologies used in TransCARE®

On-Line TransCARE®

Acoustic Partial Discharge Analysis

Thermal Imaging

Off-Line TransCARE®

LEVEL I

IR And PI

Winding Resistance

Turns Ratio

Excitation Current

Tan Delta And Capacitance Analysis

LEVEL II

Short Circuit Impedance

Electrical Partial Discharge Analysis

Sweep Frequency Response Analysis

Dielectric Frequency Response Analysis

Frequency Response For Stray Losses

Dynamic Contact Resistance

What is the process of deploying TransCARE®?

For Power
Transformers

On-Line TransCARE® and Off-Line TransCARE® Level I are performed.

Off-Line TransCARE® Level II is performed for baseline purposes.

On-Line TransCARE® and Off-Line TransCARE® Level I are repeated based on the safe operational period specified.

In case of any abnormality observed above or if DGA results are abnormal), specific tests from Off-Line TransCARE® Level II are performed to investigate the fault condition.

For Distribution
Transformers/CTs/CVTs

Off-Line TransCARE® Level I is performed.

The same is repeated based on the safe operational period specified.

Perform DFRA if tan delta is poor.

Perform PD test if DGA shows high levels of hydrogen or acetylene.