Bursa Transformer Periodic Inspection and Testing

Transformer periodic inspection is the process of examining and testing a facility's MV/LV power and distribution transformers, transformer room or transformer substation, transformer grounding installation and related MV/LV equipment at defined intervals according to the relevant legislation and standards. In practice, this service is referred to by different names such as transformer periodic inspection, transformer periodic examination, transformer room periodic inspection, transformer grounding installation periodic inspection, high-voltage transformer periodic inspection, transformer periodic tests or transformer periodic inspection report. The common purpose of all these terms is to verify that the transformer operates safely, continuously and in compliance with regulations. For related context, see Bursa Fire Detection Periodic Inspection.

Periodic inspection and periodic examination refer to the inspections, experiments and tests performed at defined intervals to determine whether work equipment endangers occupational health and safety. Transformer periodic inspection should not be confused with classic transformer maintenance services. Periodic maintenance covers operating and service activities mostly based on manufacturer recommendations, such as oil and filter replacement, connection tightening, cleaning and tap changer maintenance. Periodic inspection and examination, often mentioned under the heading of transformer periodic maintenance and inspection, is an independent test and examination activity required by the Regulation on Health and Safety Conditions in the Use of Work Equipment, and an official transformer periodic inspection report is issued at the end. Maintenance alone does not replace this report. For related context, see Bursa Electrical Contracting Services.

According to the relevant regulations, electrical installations, grounding systems, lightning protection systems, batteries, transformers and similar electrical equipment must be periodically inspected at least once a year. Therefore, unless a shorter period is defined in the standards or manufacturer instructions, the transformer periodic inspection interval is accepted as a maximum of one year. Regular transformer checks and measurements by authorized electrical/electronics engineers aim to reduce damage, fire and electric shock risks that may arise from lack of supervision and uncontrolled operation. In high-risk facilities where the probability of failure or fire is critical, such as hospitals, data centers and energy-intensive industrial facilities, the inspection interval should be shortened with interim checks. For related context, see Bursa High Voltage (HV) and Medium Voltage (MV) Services.

Our Bursa transformer periodic inspection service covers MV/LV power transformers, distribution transformers, oil-immersed and dry-type transformers, indoor and outdoor transformer substations, compact transformer substations and MV switchgear. Within this scope, transformer tank and protection equipment, tap changer, MV/LV busbar and cable connections, transformer grounding and equipotential system, transformer room architecture and ventilation are evaluated as a whole; high-voltage transformer periodic inspection tests are planned according to the site. For related context, see Bursa HV Operation Supervisor and High Voltage Responsibility.

Before arriving on site, transformer single-line and detailed projects, nameplate data, previous transformer inspection reports, commissioning tests, maintenance contracts, fault records and high-voltage operation responsibility contracts are reviewed. By considering the facility's power structure, redundant transformer-generator scenarios, short outage tolerances and operating conditions, a site-specific inspection plan is prepared for transformer periodic inspection.

During visual and mechanical examination, the transformer tank, conservator and expansion tank, radiators, cooling fans, bushings, connection clamps, tap changer mechanism, oil level and possible oil leaks, and corrosion conditions are checked. The wall and floor structure of the transformer room, locked doors, barriers, physical condition of MV switchgear, cable ducts, lighting, emergency exits and warning signs are also reviewed; deficiencies affecting life safety are noted with priority according to visual inspection criteria.

During electrical testing, the correctness of primary-secondary winding ratios is checked with the TTR test, winding integrity and connection quality are evaluated with winding DC resistance tests, and insulation levels between windings and between winding-earth are determined by insulation resistance measurements. In transformers where required, possible hidden faults are detected early through transformer oil dielectric strength tests, dissolved gas analysis (DGA), partial discharge checks, infrared thermal imaging, high-voltage withstand tests and no-load or load-loss tests under suitable conditions.

In transformer grounding installation periodic inspection, transformer body grounding, MV switchgear grounding, neutral point grounding, protective conductors and equipotential bars are checked. Grounding continuity measurements and, when required, soil resistivity measurements are performed to ensure that touch and step voltages remain within limit values. The application is carried out according to methods specified in the relevant TS EN grounding and power transformer standards and criteria in the Regulation on Health and Safety Conditions in the Use of Work Equipment; results are included in the transformer grounding installation periodic inspection report.

Within transformer room periodic inspection, natural and/or mechanical ventilation capacity, temperature values, oil pit and oil collection arrangements, fire resistance of cabling and cable penetrations, presence of fire detection and extinguishing systems, emergency lighting and emergency stop buttons, distances between MV switchgear and transformer and barriers are examined. Thus, electrical risks and fire / explosion risks are evaluated holistically.

The transformer periodic inspection report consists of inspection date, transformer substation and facility information, transformer brand/model and rating, brand/model and calibration information of test devices used, visual and mechanical examination results, measured electrical values such as TTR, insulation resistance, winding resistance and grounding values, additional tests performed, detected nonconformities and their severity levels, and conclusion-recommendations. The report is prepared in accordance with the mandatory periodic inspection report format and criteria published by the Ministry of Labor and Social Security for electrical-group work equipment and is signed by the relevant engineer so that it can be used in official audits.

Nonconformities detected during inspection are evaluated in terms of life safety, fire risk, energy continuity, regulatory compliance and maintenance needs. Findings that create critical risk are reported with priority, corrective action recommendations are written clearly, and a practical action list is created so the business can follow maintenance, repair or renewal decisions.

Transformer periodic inspection should be carried out by authorized electrical/electronics engineers who are EMO members and periodic inspection specialists registered in the EKİPNET system. The EKİPNET registration number ensures the regulatory conformity and auditability of the inspection; the transformer reports we prepare can be used as supporting documents for records entered into EKİPNET and for occupational health and safety processes managed through OHS-KATIP, such as risk assessment, annual plan and emergency plan.

When choosing among transformer periodic inspection companies in Bursa, you should consider not only price, but also the company's EKİPNET registration status, the report format's conformity with the criteria specified in the regulation for electrical-group work equipment, calibration certificates of the test devices used, referenced organized industrial zones and facilities, and the ability to provide transformer maintenance, testing and high-voltage operation responsibility services together when necessary.

We plan Bursa transformer periodic inspection works for production facilities, energy-intensive factories, shopping centers, hospitals, hotels, business centers, logistics warehouses and public facilities, especially in Nilufer OSB, NOSAB, DOSAB, Kestel, Gursu, Inegol, Hasanaga, Kayapa, Demirtas, TOSAB and Bursa Free Zone. The inspection program is prepared according to the facility's production schedule and tolerance for energy interruption.

Bursa transformer periodic inspection pricing is determined according to the number of transformers, transformer rating, oil-immersed or dry-type design, number of MV switchgear cubicles, number of transformer rooms, facility location, requested test scope, need for oil analysis and thermal imaging, reporting language and site working conditions. After the single-line diagram, transformer nameplate data and previous inspection reports are reviewed, comprehensive or narrower proposal options can be prepared.

We can plan Bursa transformer periodic inspection services in an integrated manner with regular transformer maintenance, high-voltage operation responsibility, transformer maintenance and operation contracts, MV/LV panel maintenance and your other electrical periodic inspections. In this way, production outage times are reduced and all critical equipment such as transformers, generators, electrical installations, grounding and lightning protection installations can be inspected in the same period.

You can plan transformer periodic inspection together with your other electrical periodic inspections when needed. For detailed information, you can also review our Bursa electrical installation periodic inspection, Bursa grounding installation periodic inspection, Bursa lightning protection periodic inspection, Bursa generator periodic inspection, Bursa battery periodic inspection and, for detailed maintenance-test content, our Bursa transformer maintenance and testing services pages.