TEDAŞ-MLZ/99-032.E Technical Specification for Hermetic MV/LV Distribution Power Transformers

Overview

This specification, issued by Türkiye Elektrik Dağıtım A.Ş. (TEDAŞ), is the purchasing specification for three-phase, oil-immersed, hermetic (no gas cushion) MV/LV distribution transformers. It covers units up to 36 kV and 25-2,500 kVA (clause 1.1). Turkish distribution companies and many private substations use it as the reference for rated power, losses, impedance, sound levels and tests.

The document is the fifth update, dated April 2017; the first issue was in January 1999. Section 2.2 gathers the technical requirements: rated powers, impedance, short-circuit withstand, insulation levels, sound power and losses. Temporary overloading is handled per TS 3215 / IEC 60076-7 (2.2.16). This content gives a practical starting point for transformer selection.

For losses (2.2.13), maximum values are given up to the 15.8 kV class: for 1,000 kVA, P0 770 W and Pk 7,600 W; for 1,600 kVA, 1,200 W and 12,000 W; for 2,500 kVA, 1,750 W and 18,500 W. No tolerance is applied to these values. No-load loss (P0) and load loss (Pk) are direct inputs to the energy model and to the transformer-room heat-load calculation.

The limit of the document is that it is a purchasing specification and does not replace manufacturer-specific data; actual losses should be verified against vendor test reports. Related documents named are IEC 60076-1, EU Ecodesign Regulation 548/2014 and TEDAŞ-MLZ/99-031.B. Non-hermetic and dry-type transformers are outside this specification.

Key points

1. Covers three-phase oil-immersed hermetic (no gas cushion) MV/LV distribution transformers up to 36 kV and 25-2,500 kVA.
2. Fifth update April 2017; first issue January 1999.
3. Maximum losses up to the 15.8 kV class: 1,000 kVA P0 770 W / Pk 7,600 W.
4. 1,600 kVA 1,200 W / 12,000 W; 2,500 kVA 1,750 W / 18,500 W; no tolerance is applied.
5. Temporary overloading follows TS 3215 / IEC 60076-7.
6. Sections cover rated powers, impedance, short-circuit withstand, insulation levels, sound power and losses.

Using it in design

• In the transformer catalogue (TR profile), preload hermetic transformer loss data (P0, Pk) by kVA from this specification as defaults.
• Use these values in the energy model and in the transformer-room heat-load calculation.
• Let users override the defaults with vendor test data.
• Evaluate load loss (Pk) together with the short-circuit and impedance checks.

Who should read it

Electrical engineers and procurement teams designing MV/LV substations and selecting transformers in Turkey.

Related standards

• IEC 60076-1
• EU Ecodesign Regulation 548/2014
• TEDAŞ-MLZ/99-031.B

Publication details

Authors

Türkiye Elektrik Dağıtım A.Ş. (TEDAŞ)

Publisher

Türkiye Elektrik Dağıtım A.Ş. (TEDAŞ)

Year

2017

Document number

TEDAŞ-MLZ/99-032.E

Document language

Turkish

Source type

Turkish regulation

Access

Free to read

Licence

Copyright retained; citation only — the publisher’s terms apply to the original document

Citation