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Distribution transformer · on-load

SZ20 / SZ22 On-Load Oil-Immersed Transformer

SZ20, SZ22

S20 distribution transformer with an on-load tap changer that holds the LV voltage steady when the grid fluctuates.

Rated capacity
200–2500kVA
Tapping
±4×2.5%
No-load loss vs S13
−30–40%
Ratings and dimensions
SZ20 / SZ22 On-Load Oil-Immersed Transformer

Overview

The SZ20 on-load oil-immersed energy-saving transformer adds an on-load tap changer to the S20 design, so it can adjust the low-voltage output under load. When the grid voltage fluctuates widely it keeps the output stable, for unstable rural grids and industrial and mining enterprises that need long-term stable supply.

For stricter efficiency requirements, the SZ22 grade-1 efficiency on-load transformer is also available, with performance better than SZ20.

Ratings

SZ20 on-load oil-immersed transformer ratings

Rated capacity (kVA)No-load loss (W)Load loss (W)No-load current (%)Short-circuit impedance (%)
2002152185/20800.74.0
4003703615/34400.74.0
5004304330/41200.74.0
63051049600.64.5
80063060000.64.5
100074582400.64.5
125087096000.54.5
16001050116000.54.5
20001225146400.45.0
25001440169600.45.0

HV 6 / 6.3 / 10 / 10.5 / 11 kV, tapping ±4×2.5%, LV 0.4 kV, vector group Yyn0 or Dyn11.

Design and performance

Main features

Automatic regulation
On-load regulation keeps the voltage stable in real time.
Intelligent control
Optional intelligent on-load tap changer; voltage, current, active and reactive power and power factor viewable in a mobile app, with automatic tap adjustment.
Optimised core
Stacked core, step-lap 45°, five- or seven-step full-mitre joints without punched holes.
Energy saving
Compared with S13, no-load loss 30–40% lower and load loss 20–30% lower; SZ22 losses 10% better than SZ20.
Flexible selection
Other efficiency levels available on request.

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Send the capacity, voltage ratio, vector group, impedance and site conditions. Engineering confirms the design against the approved project specification.

Certificates and reports