Oil-Immersed Transformer

S13-M Series Oil-Immersed Distribution Transformer

The S13-M oil-immersed distribution transformer uses a grain-oriented silicon-steel core to reduce no-load losses during continuous operation. The product datasheet reports an average reduction of about 30% compared with the S11 series. A sealed corrugated tank houses the active parts and accommodates normal changes in oil volume.

The standard range covers 30 to 1,600 kVA for 6–11 kV networks, with a 0.4 kV secondary. Dyn11 or Yyn0 connections and two tapping options support utility, industrial and building distribution schemes. Larger capacities are available on request.

Technical Specifications

Rated Capacity	30 – 1600 kVA (larger on request)
HV Voltage	6 / 6.3 / 10 / 10.5 / 11 kV
LV Voltage	0.4 kV
Vector Group	Dyn11 / Yyn0
Tap Range	±5% or ±2×2.5%
Short-Circuit Impedance	4.0% (30–500 kVA) / 4.5% (630–1600 kVA)
Core Material	Grain-oriented silicon steel
Tank Construction	Fully sealed
Standards	GB 1094 / GB 20052 / GB/T 6451-2015 / IEC 76

Key Features

Around 30% lower no-load loss on average than S11.
Sealed corrugated tank helps reduce routine maintenance.
Dyn11 or Yyn0 connection options.
Off-circuit tapping at ±5% or ±2×2.5%.

Typical Applications

Industrial parks and manufacturing plants
Commercial complexes and residential developments
Urban distribution substations

Installation & Aftercare

Prepare the site, plan routine checks and keep service records.

What needs to be ready before installation?

Check foundation size, load capacity and terminal positions against the outline drawing, especially when reusing cables or busbars.
Keep the delivery and replacement route clear. Allow cooling space and access to bushings, earthing and fitted accessories; provide oil containment and weather protection for the site.

What should operators check during routine rounds?

Look for oil seepage around tank seams and bushings, damaged seals and corrosion.
Record load, unusual noise and fitted temperature indications; keep cooling surfaces clear of dirt and obstructions.

How should maintenance be scheduled?

During planned outages, qualified personnel inspect terminals and earthing, clean contaminated insulation and check tank coatings.
Set service and oil-test intervals from the supplied manual, operating history and oil-condition trends. Investigate leaks, seal damage or unexplained heating promptly.

Customization Options

Define the electrical configuration and the details needed for your site.

Capacity & voltage: 30–1,600 kVA in the published range; 6 / 6.3 / 10 / 10.5 / 11 kV to 0.4 kV. Larger capacities and other voltage combinations can be reviewed on request.
Connection & taps: Dyn11 or Yyn0 vector group; off-circuit tapping at ±5% or ±2×2.5%, selected for the network.
Losses & impedance: Specify the required loss values and short-circuit impedance for the selected rating, including compatibility with any units operating in parallel.
Site & installation: Request an arrangement for the available footprint and cable connections. Declare altitude, ambient temperature, dust, humidity and coastal exposure for engineering review.
Monitoring & finish: Discuss temperature or oil-level indication, alarm contacts, corrosion protection, paint colour and nameplate language when ordering.

Project-specific options and accessories are confirmed in the quotation and approved drawings.