TMG-160 160 kVA 10/0.4 kV transformer (S13-M-160)

TMG-160 (S13-M-160) technical data

Rated current and permissible load

Losses, efficiency and comparison with amorphous SH15

The amorphous-alloy core of the SH15 cuts the no-load loss by 50 % compared with the S13. For one 160 kVA transformer this saves about 876 kWh per year, because no-load loss is present the whole time the transformer is energised, regardless of the load.

Where a 160 kVA transformer is used

A 160 kVA rating is typically chosen for a group of private houses in a mahalla, a filling station, a small workshop or production shop, or a cold store. The unit is usually installed in a separate transformer substation or as part of a compact substation close to the consumers, which keeps the 0.4 kV lines short. The oil is filled into the sealed corrugated tank under vacuum and stays out of contact with the surrounding air.

• Group of private houses in a mahalla
• Fuel and gas filling stations
• Small workshops and production shops
• Cold stores and refrigerated warehouses
• Small retail and service premises
• Pad-mounted compact substations (KTPN)

How to choose a TMG-160

Size the transformer by the calculated load, taking the diversity factor into account. At 70–80 % loading the TMG-160 delivers 101–115 kW at cos φ 0.9, which leaves headroom for compressor starting currents and seasonal peaks such as summer refrigeration and air conditioning. If the load already exceeds 115 kW, or new houses are planned in the mahalla, take the TMG-250 from the start. If the load fits comfortably within 70–80 % of 100 kVA and no growth is expected, the TMG-100 is enough: an oversized transformer carries a higher no-load loss all year round.

For houses and other single-phase consumers Dyn11 is the preferred vector group. It copes better with unbalanced phase loading and with third-harmonic currents from LED lighting, inverter air conditioners and switch-mode power supplies, and it gives a larger single-phase fault current on the 0.4 kV side, which helps protection operate at the far end of long lines. Yyn0 is the traditional choice where the neutral is lightly loaded, for example in a workshop dominated by three-phase motors. Note that the load loss of the TMG-160 depends on the vector group: 2310 W for Dyn11 and 2200 W for Yyn0.

The choice between S13, amorphous SH15 and the energy-efficient S-M-NX1 depends on the load profile. No-load loss runs all 8760 hours a year regardless of loading, and the SH15-M-160 halves it: 100 W against 200 W for the S13-M-160. For mahalla household load, with an evening peak and low average loading, the SH15 wins on this difference; its load loss equals that of the S13-M-160 in Dyn11 (2310 W). The SH15's standard vector group, and the recommended one for housing, is Dyn11; with a three-phase three-limb core, the Yyn0 vector group can also be supplied on request, so state it in your enquiry if you need it. For a cold store running at high load most of the time, load loss decides, so compare the S13 with the S-M-NX1, which has lower losses of both kinds.

Compact substation with a 160 kVA transformer

The 160 kVA transformer is also supplied as part of a compact substation: ZGS American-type pad-mounted substation (KTPN), up to 1600 kVA, or YB European-type substation (BKTP / GKTP), up to 2500 kVA. The substation is assembled and tested at the factory, so the site work mainly comes down to setting it in place and connecting the cables.

Other TMG (S13) ratings