Accredited laboratory
FMT Zaječar laboratory
The laboratory of the Factory of Measuring Transformers Zaječar is an accredited conformity assessment body in accordance with the requirements of SRPS ISO/IEC 17025:2017, with accreditation number 01-492 granted by the Accreditation Body of Serbia (ATS).
The scope of accreditation covers electrical and electronic testing of measuring transformers, carried out in the laboratory, as well as testing of low-voltage electrical installations and lightning protection systems, carried out on site.
The Accreditation Body of Serbia is a signatory of the EA MLA and ILAC MRA multilateral agreements in this field, which means that the test results of an accredited laboratory are recognised as equivalent in the signatory countries.
Laboratory contact
Stražilovska 57, 19000 Zaječar, Republic of Serbia
Phone/fax: +381 (0) 19 3413 536
E-mail: laboratorija@fmt.rs
Testing areas
Click an area to see the accredited methods, measuring ranges and reference documents.
Scope of accreditation
Detailed scope of accreditation according to the document issued by the Accreditation Body of Serbia. The scope of accreditation is valid only together with Accreditation Certificate No. 01-492.
| No. | Type of test / characteristic measured | Measuring range | Reference document |
|---|---|---|---|
| 1. Measuring transformers | |||
| 1.1 | Accuracy class test of current measuring transformers | 5 A to 3000 A | SRPS EN 61869-1:2010SRPS EN 61869-2:2014 |
| 1.2 | Accuracy class test of voltage measuring transformers | 6 kV to 35 kV | SRPS EN 61869-1:2010SRPS EN 61869-3:2012 |
| 1.3 | Winding resistance measurement | 30 µΩ to 500 kΩ | SRPS EN 60076-1:2012GSE 78:19911)IEEE Std. 57.152:2013 |
| 1.4 | Withstand voltage test on primary and secondary terminals and between sections | 0 kV to 100 kV | SRPS EN 61869-1:2010SRPS EN 61869-2:2014SRPS EN 61869-3:2012SRPS EN 60060-1:2012 |
| 1.5 | Verification of terminal markings and polarity test | – | SRPS EN 61869-1:2010SRPS EN 61869-2:2014SRPS EN 61869-3:2012 |
| 1.6 | Partial discharge measurement | 0 pC to 100 nC | SRPS EN 61869-1:2010SRPS EN 61869-3:2012 |
| No. | Type of test / characteristic measured | Measuring range | Reference document |
|---|---|---|---|
| 1. Low-voltage electrical installations | |||
| 1.1 | Measurement of the insulation resistance of the electrical installation | 0.01 Ω to 300 MΩ | SRPS HD 60364-6:2017 cl. 6.4.3.3PTN 28/951) Art. 195 |
| 1.2 | Continuity test of conductors (equipotential bonding) by electrical resistance measurement | 0 Ω to 9.99 kΩ | SRPS HD 60364-6:2017 cl. 6.4.3.2PTN 28/951) Art. 194PTN 37/951) Art. 8 |
| 1.3 | Verification of protection by automatic disconnection of supply by fault loop resistance measurement | 0.01 Ω to 9.99 Ω | SRPS HD 60364-6:2017 cl. 6.4.3.7PTN 28/951) Art. 197 a, b, v |
| 1.4 | Verification of protection by automatic disconnection of supply by checking the operation of the residual current device (RCD) | 5 ms to 1000 ms 3 mA to 650 mA | SRPS HD 60364-6:2017 cl. 6.4.3.7PTN 28/951) Art. 197 a, b, v |
| 1.5 | Verification of protection by automatic disconnection of supply by measuring the total earth electrode resistance | 0.15 Ω to 9.99 kΩ | SRPS HD 60364-6:2017 cl. 6.4.3.7PTN 28/951) Art. 197 a, b, v |
| 2. Lightning protection systems | |||
| 2.1 | Continuity test of the air-termination system, down-conductor system and earth-termination system | 0 Ω to 9.99 kΩ | SRPS EN 62305-3:2017SRPS HD 60364-6:2017SRPS IEC 1024-1:1996 |
| 2.2 | Measurement of the earth resistance of lightning protection earth electrodes | 0.15 Ω to 9.99 kΩ | SRPS EN 62305-3:2017SRPS HD 60364-6:2017SRPS IEC 1024-1:1996 |
| 2.3 | Equipotential bonding test | 0.01 Ω to 99.9 Ω | SRPS EN 62305-3:2017SRPS HD 60364-6:2017SRPS IEC 1024-1:1996 |
1) Reference documents legend
- GSE 78:1991 – Rulebook on the maintenance of power facilities of the transmission network of Yugoslavia; Association of Yugoslav Electric Power Industry, Belgrade, 1991.
- PTN 28/95 – Rulebook on technical standards for low-voltage electrical installations, Official Gazette of FRY 28/95.
- PTN 37/95 – Rulebook on technical standards for the protection of low-voltage networks and associated transformer substations, Official Gazette of FRY 37/95.
Test request
For testing of measuring transformers in the laboratory, or testing of electrical installations and lightning protection on site, send an inquiry to laboratorija@fmt.rs or call us at +381 (0) 19 3413 536.
Product quality control laboratory
The product quality control laboratory tests and checks the quality of measuring transformers during the various stages of the production process, and carries out their final testing before delivery.
In-process inspection
During in-process inspection, transformers are tested at key stages of production – after the windings are wound onto the core, and before and after the casting process. This allows any deviations to be detected in time and ensures that product quality is monitored throughout the entire production process.
Final testing
Final testing consists of routine tests in accordance with the requirements of the relevant standards, which include:
- power-frequency withstand voltage test on primary terminals;
- partial discharge measurement;
- power-frequency withstand voltage test between sections;
- power-frequency withstand voltage test on secondary terminals;
- accuracy test;
- verification of markings.
The laboratory's work is based on reliable measuring systems, defined procedures and the professional work of its staff, with the aim of ensuring a high and consistent level of quality for every transformer that leaves the production process.
Documents
Click a document to view it. You can download the PDF using the “Download PDF” button in the document viewer. The current edition of the scope of accreditation is also available at www.ats.rs.
Laboratory equipment
Measuring and test equipment of the laboratory. Click a photo to enlarge it.