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Ensure your business's energy security in accordance with legal and technical standards.

Transformers are critical equipment in the conversion and distribution of electrical energy, and any malfunction can completely halt production processes and cause significant financial losses for businesses. Transformer inspection is a comprehensive control and testing process that ensures these critical pieces of equipment operate safely, efficiently, and in accordance with standards.


How to Inspect a Transformer: Comprehensive Test Protocol
The answer to the question of how transformer inspection is performed is a systematic protocol encompassing visual inspection, electrical tests, and chemical analysis. The professional inspection process is carried out in accordance with national and international standards (TS EN 60076, IEC 60060).

How to Inspect a Transformer: Comprehensive Test Protocol

Visual Inspection and Physical Examination

  • External Structure and General Physical Condition Inspection: The tank's integrity, paint and corrosion condition, and whether there are any oil leaks are inspected.
  • Bushing, Terminals and Grounding Check:
    The condition of the bushings (broken/cracked), connection terminals, and grounding connections is evaluated.
  • Inspection of Oil and Cooling Systems:
    Oil level, conservator-expansion tank, silica gel condition, radiators and cooling fans are checked.
  • Inspection of Protective and Indicator Equipment:
    The Buchholz relay, pressure relay, thermometers, and emergency situations such as abnormal sounds/odors/heating are checked.
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Ensure the safety and efficiency of your transformers with professional inspection!

Transformer inspections are vital for ensuring your business's uninterrupted power supply, employee safety, and compliance with legal obligations. Don't take risks, get your periodic inspections done. TURKAK accredited Entrust it to the professionals! AES Innovation's expert engineering team is there for you with standard-compliant test protocols and annual maintenance contracts.

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Transformer Periodic Inspection Period and Legal Requirements

The periodic inspection period for transformers is determined by the Regulation on Health and Safety Conditions in the Use of Work Equipment, which is based on the Occupational Health and Safety Law No. 6331. The regulation mandates that electrical internal installation components undergo periodic inspection at least once a year by TÜRKAK-accredited Type A inspection bodies.
Under normal operating conditions, comprehensive inspections of transformers every 12 months is standard practice. However, for transformers operating in sectors with high energy consumption, such as heavy industry, petrochemicals, and automotive manufacturing, or in extreme environmental conditions (high humidity, dust, temperature), the inspection period can be reduced to 6 months. Furthermore, in transformer substations without technical personnel, a simple visual inspection every 6 months is also required by regulation.


TURKAK Accredited Transformer Inspection: Reliability and Validity

The periodic inspection period for transformers is determined by the Regulation on Health and Safety Conditions in the Use of Work Equipment, which is based on the Occupational Health and Safety Law No. 6331. The regulation mandates that electrical internal installation components undergo periodic inspection at least once a year by TÜRKAK-accredited Type A inspection bodies.
Under normal operating conditions, comprehensive inspections of transformers every 12 months is standard practice. However, for transformers operating in sectors with high energy consumption, such as heavy industry, petrochemicals, and automotive manufacturing, or in extreme environmental conditions (high humidity, dust, temperature), the inspection period can be reduced to 6 months. Furthermore, in transformer substations without technical personnel, a simple visual inspection every 6 months is also required by regulation.

Frequently Asked Questions

Contact us today for transformer inspection, TTR testing, oil analysis, DGA, and standard format reporting services. Secure your business's energy safety and prevent sudden failures and production losses!

Transformer inspection is a comprehensive protocol that includes visual inspection, electrical testing, and chemical analysis. Visual inspection examines the tank, bushings, oil level, radiators, and connections. Electrical testing includes tests of the TTR transformation ratio, insulation resistance, winding resistance, and applied voltage. Oil analysis includes dielectric strength, moisture, acidity, and dissolved gas analysis (DGA).

According to the Regulation on Health and Safety Conditions in the Use of Work Equipment, transformers must be inspected at least once a year by TÜRKAK-accredited inspection bodies. In heavy industry and adverse environmental conditions, this period can be reduced to 6 months. In transformer substations without technical personnel, a simple visual inspection should also be carried out every 6 months.

Yes, transformer inspection is a legal requirement under Law No. 6331 on Occupational Health and Safety. Failure to conduct periodic inspections increases employer liability in case of workplace accidents, prevents the payment of insurance compensation, and results in administrative fines during inspections by the Ministry of Labor. The use of standard report formats has also become mandatory from September 1, 2025.

TÜRKAK accredited transformer inspection demonstrates that the technical competence of the inspection body, the expertise of its personnel, and the calibration of its testing equipment have been verified according to the TS EN ISO/IEC 17020 standard. Non-accredited reports are not accepted in official audits and insurance applications. TÜRKAK accreditation guarantees the reliability and legal validity of the inspection results.

The TTR (Transformer Turn Ratio) test is a critical test that checks whether the voltage ratio between the primary and secondary windings conforms to the design value. The test is performed separately for each phase using a special TTR device and verifies the connection group. If the ratio deviation exceeds %0.5, it means there is a winding fault, short circuit bends, or connection errors.