TMG-1000 1000 kVA 10/0.4 kV transformer (S13-M-1000)

TMG-1000 (S13-M-1000) 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 1000 kVA transformer this saves about 3329 kWh per year, because no-load loss is present the whole time the transformer is energised, regardless of the load.

Where a 1000 kVA transformer is used

A 1000 kVA transformer is typically chosen to supply industrial plants with large motors and process lines, as well as large shopping and business centres. The TMG-1000 is also commonly installed in pairs in two-transformer 2×1000 kVA substations, where two independent incoming supplies provide redundancy for critical and essential loads. The S13-M-1000 has passed type testing and holds a type-test certificate, which helps when the design has to be approved by the client.

• Industrial plants and in-plant substations
• Large shopping and business centres
• Two-transformer 2×1000 kVA substations
• ZGS and YB compact substations
• Pumping and compressor stations
• Logistics hubs and warehouse terminals

How to choose a TMG-1000

Size the transformer on the calculated load with a margin: at the recommended 70–80% loading the TMG-1000 supplies 630–720 kW at cos φ 0.9. If the load is well below that range and no growth is planned, the TMG-630 is more economical; if it exceeds 720 kW or the plant will expand, consider the TMG-1250. Compensating reactive power to cos φ 0.95 raises the active power available at full load to 950 kW and sometimes lets you stay with a 1000 kVA unit. In a 2×1000 kVA substation each unit is loaded so that, if one is switched off, the other can take over the critical loads.

The TMG-1000 is available with vector group Yyn0 or Dyn11. Yyn0 is the traditional choice where the load is evenly spread across the phases and the neutral is lightly loaded, for example in production halls dominated by three-phase motors. In shopping centres with many single-phase consumers, LED lighting and IT equipment with switch-mode power supplies, Dyn11 is preferable: it copes better with unbalanced load and third-harmonic currents and gives a larger single-phase fault current, which matters for protection sensitivity at the 1443 A incomer and on the 0.4 kV outgoing feeders. The amorphous SH15-M-1000 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.

Choose the series by the load profile. Present in all 8760 hours of the year, the S13-M-1000 no-load loss of 830 W adds up to about 7271 kWh. The amorphous SH15-M-1000 cuts it by 46% to 450 W, with the same 10300 W load loss. With low average loading, as in a 2×1000 kVA pair or a shopping centre with a deep night-time dip, SH15 is the better fit. At a plant with high round-the-clock loading, load losses dominate and SH15 does not reduce them, so S13 remains a sound choice; to cut total losses further or meet energy-efficiency grade 1 to GB 20052-2020, consider the lower-loss S-M-NX1.

Compact substation with a 1000 kVA transformer

The 1000 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