Oil-immersed and dry-type distribution transformers from 30 to 2500 kVA, plus PV combiner and grid-connection equipment.
We supply distribution transformers from 30 to 2500 kVA in oil-immersed and cast-resin dry-type versions, at 10 kV, 20 kV and 35 kV. Alongside them we build the PV-side equipment used in solar projects: DC and AC combiner boxes and anti-reverse grid-connection boxes.
Transformers can be supplied loose, or factory-fitted into a box-type substation as a complete package — which is usually the cheaper and faster route for a site installation.
Sealed-tank and conservator designs for outdoor and indoor substations — the standard choice for most distribution applications.
| Parameter | Unit | S11-M | S13-M | SH15 (amorphous) |
|---|---|---|---|---|
| Rated capacity | kVA | 30–2500 | 30–2500 | 30–2500 |
| HV voltage | kV | 10 / 10.5 / 11 (20, 35 available) | as S11 | as S11 |
| LV voltage | V | 400 / 415 / 433 | as S11 | as S11 |
| Vector group | — | Dyn11 (Yyn0 on request) | as S11 | as S11 |
| No-load loss, 630 kVA example | W | ≈ 810 | ≈ 570 | ≈ 320 |
| Load loss (75°C), 630 kVA example | W | ≈ 6200 | ≈ 6200 | ≈ 6200 |
| Impedance voltage | % | 4–4.5 | 4–4.5 | 4–4.5 |
| Tap changer | — | Off-circuit ±5% | Off-circuit ±5% | Off-circuit ±5% |
| Cooling | — | ONAN | ONAN | ONAN |
| Ambient temperature | °C | −25 to +40 | as S11 | as S11 |
| Standards | — | IEC 60076, GB 1094 | as S11 | as S11 |
Loss figures shown are indicative for 630 kVA units and vary with design and material. S13 and SH15 use lower-loss cores; SH15 uses amorphous alloy and gives the lowest no-load loss, which pays back fastest on lightly loaded or continuously energised transformers.
No oil, no fire load, no bund — the standard answer for indoor installations inside buildings, tunnels, hospitals and data centres.
| Parameter | Unit | SCB10 | SCB13 |
|---|---|---|---|
| Rated capacity | kVA | 30–2500 | 30–2500 |
| HV voltage | kV | 10 / 10.5 / 20 / 35 | 10 / 10.5 / 20 / 35 |
| LV voltage | V | 400 / 415 / 433 | 400 / 415 / 433 |
| Vector group | — | Dyn11 | Dyn11 |
| No-load loss, 1000 kVA example | W | ≈ 1550 | ≈ 1080 |
| Load loss (120°C), 1000 kVA example | W | ≈ 8800 | ≈ 8400 |
| Insulation class / temperature rise | — | Class F, rise ≤ 100 K | Class F, rise ≤ 100 K |
| Protection degree | — | IP00 / IP20 / IP23 | IP00 / IP20 / IP23 |
| Cooling | — | AN / AF (forced air optional) | AN / AF (forced air optional) |
| Standards | — | IEC 60076-11, GB 1094.11 | IEC 60076-11, GB 1094.11 |
Indoor rooms, basements and tunnels where an oil bund is impossible, or where fire load must be minimised. Also preferred in public buildings.
Outdoor and pole-mounted installations, higher capacities and where cost per kVA matters more than fire performance.
Temperature control with alarm and trip contacts, cooling fans, IP enclosure, flexible connections and vibration pads.
DC and AC side equipment for grid-tied solar plants — combiner, protection and connection.
| Product | Function | Typical configuration | Protection |
|---|---|---|---|
| DC combiner box | Combines PV strings before the inverter | 4 / 6 / 8 / 12 / 16 inputs, 1000 or 1500 V DC | String fuses, DC SPD, DC isolator, IP65 enclosure |
| AC combiner box (HLX-AC) | Combines inverter outputs before the transformer | 2–8 inputs, up to 630 A | MCCB, AC SPD, metering, IP65 |
| Anti-reverse grid connection box (BWX) | Prevents reverse power flow / controls export | Up to 630 A | Breaker, reverse-power relay, metering |
| PV step-up substation | Steps up to the grid connection voltage | Built into a box-type substation | HV switch, transformer, LV board |
Tell us the string voltage and current, inverter model and output rating, and we will configure the box — or supply it as part of a complete PV substation package.
Send capacity, voltages, vector group and winding material for transformers — or your string and inverter data for PV equipment. Firm price within 24 hours.
