Power transformer · split winding
Oil-Immersed Split-Winding Transformer
SZ-50000/110 (example)
Multi-winding transformer whose low-voltage winding is split into equal branches to limit short-circuit current.
- Example rating
- 50MVA
- Split factor
- ≥ 3.4
- Through impedance
- 10.5%
Overview
Split-winding transformers are increasingly used to limit short-circuit current and save investment. Because breaker interrupting capacity is limited, station-service transformers of large power stations supply two branches, so split transformers are widely used there.
The low-voltage winding is split into several branches of equal capacity with no electrical connection and only weak magnetic coupling between them.
Design and performance
Main features
- Three operating modes
- Through, half-through and split operation.
- Two split methods
- Radial split and axial split.
- Fault ride-through
- When one LV branch is short-circuited, the other can still run at close to 90% voltage.
- Economy
- Low manufacturing cost and smaller volume for the same capacity.
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Send the capacity, voltage ratio, vector group, impedance and site conditions. Engineering confirms the design against the approved project specification.