TMG-1600 1600 kVA 10/0.4 kV transformer (S13-M-1600)

TMG-1600 (S13-M-1600) 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 46 % compared with the S13. For one 1600 kVA transformer this saves about 4730 kWh per year, because no-load loss is present the whole time the transformer is energised, regardless of the load.

Where a 1600 kVA transformer is used

A 1600 kVA unit is typically chosen to supply large industrial consumers: workshops with heavy motor drives, compressor and pumping stations, and auxiliary loads at mining and metallurgical sites. Another common application is large commercial and residential buildings with their own substation, such as shopping and office centres, hotels and housing complexes. In addition, 1600 kVA is the top of the American-type ZGS pad-mounted (KTPN) range, while the European-type YB (BKTP / GKTP) substations, which go up to 2500 kVA, cover this rating as well.

• Workshop substations at large industrial plants
• Auxiliary loads at mining and metallurgy sites
• Compressor, pumping and ventilation stations
• Large shopping, office and hotel complexes
• 1600 kVA YB (BKTP) prefabricated substations
• Two-transformer substations with mutual backup

How to choose a TMG-1600

Size the TMG-1600 for 70–80% loading: at cos φ 0.9 that is 1008–1152 kW of design load, leaving headroom for motor starting currents and load growth. If the design load fits into 1250 kVA with the same margin, the TMG-1250 is the better match and has a lower no-load loss. If the load stays above 1152 kW or a plant extension is planned, consider the TMG-2000 or TMG-2500, or splitting the load between two transformers. Also check the LV fault level: at the LV terminals of the TMG-1600 it is about 51.3 kA at nominal uk and an infinite supply; the uk tolerance and the IEC 60909 voltage factor can raise it by roughly 10%, while network and cable impedance lower it. Confirm the incoming breaker's breaking capacity with the project short-circuit calculation, or choose it with margin above 51.3 kA.

The vector group for a TMG-1600 depends on what it feeds. In a plant substation dominated by large three-phase motors, compressors and fans the neutral is lightly loaded, and the traditional Yyn0 is fully adequate. In a 1600 kVA shopping or office centre the share of single-phase UPS units, servers and LED drivers is large, so Dyn11 is chosen: it copes better with unbalance and third harmonics and gives a larger single-phase fault current for protecting long 0.4 kV feeders. The choice does not affect losses: load loss is 14500 W for both groups.

The choice between S13, amorphous SH15 and energy-efficient S-M-NX1 depends on the load profile. No-load loss runs 8760 hours a year regardless of loading, and the SH15-M-1600 cuts it by 46% compared with the S13-M-1600. That pays off where average loading is low: standby units, commercial buildings with deep night-time dips, seasonal plants. In round-the-clock operation at high loading, as is typical of mining and metallurgy, load loss dominates; it is the same for S13 and SH15, so the S13 remains a sound choice. If the project requires energy-efficiency grade 1 to GB 20052-2020, consider the S-M-NX1. The SH15 is built with Dyn11 as standard; with a three-phase three-limb core, the Yyn0 vector group can also be supplied on request, so state it in your inquiry if you need it.

Compact substation with a 1600 kVA transformer

The 1600 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