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ONDCE-4350/25P-U2 traction transformer

ONDCE-4350/25K-U2 type traction transformer designed for freight electric locomotives ES5K, 2ES5K, 3ES5K and 4ES5K operating on AC electrified railways (25 kV, 50 Hz). The transformer converts overhead contact line voltage into supply voltages for traction motors, excitation windings and auxiliary systems of the locomotive. It also supports reverse (inverting) operation, enabling energy conversion from traction motors back to the contact line, as well as supplying excitation and auxiliary circuits.

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Description

Transformer symbols

O – Single-phase
NDC – Forced air and oil circulation with directed oil flow
E – Designed for electric rolling stock applications
4350 – Rated power, kVA
25 – Line winding nominal voltage, kV
P – Suspended design
U2 – Climatic category and installation type in accordance with GOST 15150

Characteristic

Traction transformers — ONDCE-4350/25P-U2
Parameter	Value
Transformer type	ОНДЦЭ-4350/25 П-У2
Rated power of line winding, kV∙A	4345
Rated voltage of line winding, kV	25
Supply frequency, Hz	50
Rated voltage of traction winding terminals, V	а₁-х₁ а₂-х₂ 1260
	а₁-2, 2-х₁, а₂-4, 4-х₂ 630
	а₁-1, 1-2, а₂-3, 3-4 315
Rated power of auxiliary winding, kV∙A	205
Rated voltage of auxiliary winding terminals, V	а₄-х₄ 401
Rated voltage of auxiliary winding terminals, V	а₄-6 229
Rated power of excitation winding, kVA	112
Rated voltage of excitation winding terminals, V	а₃-5 86
Rated voltage of excitation winding terminals, V	5-х₃ 86
Rated power of heating winding, kVA	-
Rated voltage of heating winding terminals, V	-
Total transformer losses, kW	60,5
Winding connection diagramand vector group	1/1-1-1-1-0-0-0-0
Oil weight, kg	1450
Total weight, kg	7500