220kV three-phase on-load tap-changer interconnection transformer

SSZ20-180000/220-NX2
This product is a 220kV three-phase oil-immersed on-load tap-changer tie transformer, independently developed and designed by TBEA. It is one of the key equipment in 220kV voltage level power transmission and transformation projects. Its function is to connect power grids of different voltage levels and meet the needs of the power system by adjusting the output voltage.

Product Advantages
Utilizing advanced simulation verification technology, it exhibits high resistance to short circuits.
Advanced magnetic flux leakage control measures are adopted to reduce load losses.
Equip with various online monitoring devices to meet intelligent requirements.
Safe and stable, with reliable operation.
Application Scenarios
This product can be applied to 220kV voltage level transmission and transformation lines, providing strong support for long-distance, cross-regional, and large-capacity energy transmission.
Technical Specifications

Product Model	–	SSZ20-180000/220-NX2
Rated capacity	KVA	180000/180000/90000
Rated voltage ratio	KV	(220±8×1.25%)/121/38.5
short-circuit impedance	%	L-M: 8%(±5%) H-M: 14%(±3%) L-H: 24%(±5%)
rated frequency	Hz	50
Connection group label	–	YNyn0d11
Insulation level	KV	SI750LI950AC395-LI400AC200 LI480AC200-LI325AC140 LI200AC85
cooling method	–	ONAN
No-load loss	KW	≤81
load loss	KW	≤538
Temperature Rise Limit	K	Top oil layer: 50 Winding hot spot: 60
Noise (sound pressure level)	dB(A)	≤65

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