{"id":6432,"date":"2026-10-12T13:52:16","date_gmt":"2026-10-12T10:52:16","guid":{"rendered":"https:\/\/aesinn.com\/zpkr05-transformator-1-36-kv-periyodik-kontrol-raporu-ve-kriterleri\/"},"modified":"2026-10-12T13:52:16","modified_gmt":"2026-10-12T10:52:16","slug":"zpkr05-transformator-1-36-kv-periyodik-kontrol-raporu-ve-kriterleri","status":"publish","type":"post","link":"https:\/\/aesinn.com\/en\/zpkr05-transformator-1-36-kv-periyodik-kontrol-raporu-ve-kriterleri\/","title":{"rendered":"Transformer 1-36 kV Visual Inspection and Grounding Periodic Inspection Report (ZPKR05) and Criteria (ZPKK05): Ministry Format"},"content":{"rendered":"

Ministry of Labor and Social Security, Transformer 1-36 kV visual inspection and grounding.<\/strong> a mandatory report format for periodic inspectionsZPKR05<\/strong>) and control criteria document (ZPKK05<\/strong>(published. The documents were published on July 18, 2025; 01.09.2025<\/strong> From [date] onwards, the complete use of this format, both in form and content, is mandatory. The format is based on Article 14\/B of the Work Equipment Regulation; the main headings and their order remain unchanged, while the size and layout of the content may be adapted. This page summarizes, based on the documentation, what the criteria are looking for and the sections the report consists of.<\/p>\n\n\n\n

Scope and report preparation rules<\/h2>\n\n\n\n
  • This document covers the periodic inspections of equipment in installations with voltages between 1-36 kV, as defined in the Electrical Installations High Current Installations Regulation (as written in the document).<\/li>
  • The inspection report must be prepared separately for each piece of equipment (Transformer-Circuit Breaker-Substation).<\/li>
  • The findings of non-conformity can be illustrated with photographs as an appendix to the report.<\/li>
  • The report format includes three regulations regarding the method and scope of periodic inspections: the Regulation on Health and Safety Requirements in the Use of Work Equipment, the Regulation on Grounding in Electrical Installations, and the Regulation on High Voltage Electrical Installations.<\/li>
  • In facilities with a large number of points, multiple forms may be used, or only Section 5 of the form may be duplicated.<\/li>
  • The evaluation was conducted as \u201cSuitable\u201d, \u201cNot Suitable\u201d, and \u201cNot Applicable\u201d (statement in the report format).<\/li>
  • The report is prepared with the number of copies indicated in both words and numbers (\u201cThis report has been prepared in \u2026\u2026\u2026\u2026 (words (numbers)) copies.\u201d).<\/li><\/ul>\n\n\n\n

    Control criteria (ZPKK05)<\/h2>\n\n\n\n
    No<\/th>Criterion<\/th>What is checked?<\/th>Rest<\/th><\/tr><\/thead>
    2.1<\/td>Danger of death\/Warning sign check<\/strong><\/td>Safety control devices affecting work equipment must be clearly visible and identifiable, and appropriately marked where necessary.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 2.1.1 (Annex I)<\/td><\/tr>
    2.2<\/td>Electrical hazard signs<\/strong><\/td>All power devices, measuring transformers, measuring instruments, and fuses must have indelible, durable, and visible markings.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 19<\/td><\/tr>
    2.3<\/td>Plastic chain checks<\/strong><\/td>Work equipment must have appropriate safety devices to eliminate risks of parts flying off or falling from its components.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 2.5<\/td><\/tr>
    2.4<\/td>Checking the locks and lock lugs.<\/strong><\/td>When work equipment or hazardous parts are stopped, the power supply that powers them must also be switched off. Maintenance and repair of equipment with special risks should only be carried out by specially qualified personnel.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 2.3, Article 8(1)(b)<\/td><\/tr>
    2.5<\/td>Security barriers<\/strong><\/td>Except in cases of necessity, control devices should be located outside of hazardous areas and their use should not create an additional hazard.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 2.1.2<\/td><\/tr>
    2.6<\/td>Work equipment inventory check<\/strong><\/td>Work equipment must be adequately documented with written information and instructions, and these instructions must be kept with the equipment.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 10<\/td><\/tr>
    2.7<\/td>Periodic maintenance records<\/strong><\/td>Inspection results must be recorded and stored properly for review by authorities.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 7(1)(c)<\/td><\/tr>
    2.8<\/td>Emergency stop systems<\/strong><\/td>Depending on the hazard of the work equipment and the normal downtime, emergency stop systems must be in place when necessary.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 2.4<\/td><\/tr>
    2.9<\/td>Cutting controls<\/strong><\/td>Each distribution transformer must have a thermal-magnetic circuit breaker at its low-voltage output.<\/td>Regulation on High Voltage Electrical Installations \u2013 Article 38<\/td><\/tr>
    2.10<\/td>Differential controls<\/strong><\/td>Every power transformer must be equipped with secondary protection circuit breakers on both the primary and secondary sides.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 39<\/td><\/tr>
    2.11<\/td>Protection relay checks<\/strong><\/td>Overload protection relays should be installed on the secondary side, and load disconnecting protective devices should be present at the low-voltage feeder outputs.<\/td>Regulation on High Voltage Electrical Installations \u2013 Article 38<\/td><\/tr>
    2.12<\/td>Current transformer checks<\/strong><\/td>Current transformers for energy measurement must be Class 0.5, and for protection applications, they must be at least Class 3.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 19<\/td><\/tr>
    2.13<\/td>Voltage transformer checks<\/strong><\/td>Voltage transformers for energy measurement must be Class 1, and for protection applications, they must be at least Class 3.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 19<\/td><\/tr>
    2.14<\/td>Bar connections<\/strong><\/td>Active parts must be out of reach to prevent accidental contact, and safety distances must be maintained.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 5<\/td><\/tr>
    2.15<\/td>Grounding connections<\/strong><\/td>All high-current electrical equipment and protective enclosures with metal casings must be connected to grounding conductors.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 18<\/td><\/tr>
    2.16<\/td>Transformer housing checks<\/strong><\/td>Equipment with safety requirements depending on installation and assembly conditions should be inspected by qualified personnel before first use and after major maintenance\/repairs.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 7(1)(a)<\/td><\/tr>
    2.17<\/td>Oil level checks<\/strong><\/td>Oil level indicators are mandatory and should generally be marked at a reference temperature of 25\u00b0C. The oil level should be maintained above the radiator inlet level.<\/td>Regulation on High Voltage Electrical Installations \u2013 Article 37 (relevant technical requirements)<\/td><\/tr>
    2.18<\/td>Temperature indicators<\/strong><\/td>Oil temperature gauges should have dial-type displays and single or double electrical contacts for alarm\/trip functions.<\/td>Regulation on High Voltage Electrical Installations \u2013 Article 37 (relevant technical requirements)<\/td><\/tr>
    2.19<\/td>Buchholz relay<\/strong><\/td>Buchholz relays are mandatory for oil-filled transformers above 500-750 kVA, and they must have gas detection and oil level monitoring functions.<\/td>Regulations on High Voltage Electrical Installations \u2013 Articles 38-39 (protection systems)<\/td><\/tr>
    2.20<\/td>Pressure relief devices<\/strong><\/td>Pressure relief valves are necessary to protect against internal pressure build-up and must provide automatic relief when pre-set limits are exceeded.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 40<\/td><\/tr>
    2.21<\/td>Cooling systems<\/strong><\/td>Transformers must have adequate ventilation measures. If natural ventilation is not possible, forced or customized ventilation must be used.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 37<\/td><\/tr>
    2.22<\/td>Transformer room lighting<\/strong><\/td>HV switchboards and LV panel rooms must be illuminated with a minimum of 250 lux, transformer rooms with a minimum of 150 lux, and all compartments must have battery-powered emergency lighting.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 37<\/td><\/tr>
    2.23<\/td>Star point grounding<\/strong><\/td>Transformers require both protective and operational grounding. The operational grounding resistance should be less than 1 \u03a9.<\/td>Regulations on Grounding in Electrical Installations \u2013 Article 4 and related technical requirements.<\/td><\/tr>
    2.24<\/td>Tank grounding<\/strong><\/td>All electrical equipment with metal casings must be grounded, and the protective grounding must be connected to the environmental grounding system.<\/td>Regulations on Grounding in Electrical Installations \u2013 Article 4 (Definition of protective grounding)<\/td><\/tr>
    2.25<\/td>Grounding resistance measurement<\/strong><\/td>Periodic measurements should be taken once a year in industrial and commercial facilities, and at maximum intervals of one year in humid and wet workplaces.<\/td>Regulations on Grounding in Electrical Installations \u2013 Annex P (Test frequencies)<\/td><\/tr>
    2.26<\/td>Maintenance and Testing Requirements<\/strong><\/td>Maintenance and repairs must be carried out at the intervals specified in the technical documentation, and proper documentation and record keeping are mandatory.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 27<\/td><\/tr>
    2.27<\/td>Isolation tests<\/strong><\/td>All operational equipment (insulating rods, safety pliers, insulating gloves, platforms) must be tested at standard intervals.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 26<\/td><\/tr>
    2.28<\/td>Hermetic protection systems<\/strong><\/td>Equipment that poses a risk of gas, vapor, liquid, or dust release must be equipped with suitable systems to contain or remove these substances at their source.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 2.5.1<\/td><\/tr>
    2.29<\/td>Istanka control<\/strong><\/td>Insulating rods used in electrical work must have adequate insulation properties against electric current and must be tested periodically.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 9(1)(d)<\/td><\/tr>
    2.30<\/td>Isolated table control<\/strong><\/td>Insulated stands used for electrical safety must have the appropriate insulation level and be checked regularly.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 9(1)(d)<\/td><\/tr>
    2.31<\/td>Insulated carpet inspection<\/strong><\/td>Insulating mats used in front of electrical panels must provide protection against electric current and be checked for physical damage.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 9(1)(d)<\/td><\/tr>
    2.32<\/td>Electrical glove inspection<\/strong><\/td>Electrical gloves must be of the appropriate class for the operating voltage level, undergo visual inspection, and be periodically electrically tested.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 9(1)(a)<\/td><\/tr>
    2.33<\/td>Safety belt\/safety rope<\/strong><\/td>Safety harnesses and ropes used in work at height must meet appropriate standards and be regularly inspected.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 9(1)(e)<\/td><\/tr>
    2.34<\/td>Helmet and safety glasses<\/strong><\/td>Helmets and safety glasses used in electrical work must provide an appropriate level of protection and be in undamaged condition.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 9(1)(c)<\/td><\/tr>
    2.35<\/td>First aid supplies<\/strong><\/td>Sufficient and up-to-date first aid supplies should be available and easily accessible in the workplace.<\/td>Regulation on Health and Safety Requirements in the Use of Work Equipment \u2013 Article 11<\/td><\/tr>
    2.36<\/td>Fire extinguishers<\/strong><\/td>Appropriate class fire extinguishers (CO\u2082, dry chemical powder) must be available in electrical installations and their maintenance must be carried out periodically.<\/td>Regulations on High Voltage Electrical Installations \u2013 Article 25<\/td><\/tr>
    3.0<\/td>Preparation<\/strong><\/td>General information about the facility to be measured, such as the measurement date, weather conditions, and soil conditions, should be checked. Installation information, including whether a grounding project exists for the facility, should also be inquired about. Measurements should be performed without de-energization in areas with high electromagnetic interference, as measurement uncertainty will increase. The measurement is carried out under the supervision and with the knowledge of the transformer operator.<\/td>Regulations on Grounding in Electrical Installations, TS EN 50522 (Grounding of power installations exceeding 1 kV AC)<\/td><\/tr>
    3.1<\/td>Measurement point<\/strong><\/td>In protective grounding measurements, the measurement is taken from the strip bar that runs around the high-voltage cells. In operational grounding measurements, the measurement is taken from the main neutral busbar of the main distribution panel.<\/td>Regulations on Grounding in Electrical Installations \u2013 Appendix C<\/td><\/tr>
    3.2<\/td>Protection area mm\u00b2<\/strong><\/td>The suitability of the protective conductor cross-section is determined according to the earth short-circuit current.<\/td>Regulations on Grounding in Electrical Installations \u2013 Appendix C<\/td><\/tr>
    3.3<\/td>The suitability of the grounding voltage generated by the measured protective grounding.<\/strong><\/td>RB is operational grounding, RE is protective grounding; tE is the current setting for the circuit breaker tripping time to ground, UTP is taken from Figure 6 of the ETTY depending on the tE circuit breaker tripping time, IE is the ground short-circuit current calculated according to the RN resistance on the secondary side of the 154 kV \/ 34.5 kV transformer. UE = IE.RE; if UE < 2.UTP, compliance is granted; if UE < 4.UTP, compliance is granted after checking the measures M specified in the Grounding Regulation. Additional measures: if UE < 2.USTP, compliance is granted; if UE < 4.USTP, compliance is granted after checking the measures Annex-M specified in the ETTY.<\/td>Regulations on Grounding in Electrical Installations \u2013 Annex-C, Figure-6, Annex-M<\/td><\/tr>
    3.4<\/td>Suitability of grounding voltage when operational and protective grounding are combined.<\/strong><\/td>Grounding voltage conditions in combined grounding: If the LV side TN and PEN are grounded at a single point, UE < UTP; if the LV side TN and PEN are grounded at multiple points, UE < 2.UTP; if the LV side TT, U2 = UE + 0.23 kV and U2 < 1.2 kV.<\/td>Regulations on Grounding in Electrical Installations \u2013 Annex-M<\/td><\/tr>
    3.N<\/td>Notes section<\/strong><\/td>Corrosion, rupture, and cross-sectional problems observed in the grounding system are noted in the notes section, and recommendations are made; the system is evaluated according to the nature of the defect. The full names, signatures, professional titles, diploma numbers, date and number, project approval validity period, etc., of those who approved the project will be included.<\/td>Regulations on Grounding in Electrical Installations<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Limit values and thresholds in the document<\/h2>\n\n\n\n