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Three phase 35kv 400kVA dry type grounding transformer direct supplier

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Product Details

Key attributes

Usage:Power

Phase:Three

Coil Structure:TOROIDAL

Coil Number:AUTOTRANSFORMER

Place of Origin:China

Model Number:DKSC10-400/35

Rated capacity:400kVA

Off-load loss:1500W

Zero sequence impedance (Zn):170

Neutral point current:20A

Products Description
1.The earthing transformer are commonly used to provide an artificial system of grounding point can take loads of neutral point, for grounding system to use, this product neutral point connected to the arc suppression coil or resistance, and then ground. The earthing transformer can carry secondary winding of continuous rated capacity as power supply for a station. 2.The main use areas: substation, user distribution substation 35kv and below power system, etc. Main Technical Specification: 1.Rated capacity: 100 ~ 5500kVA; Rated voltage: 35kV and below 2.Insulation class: F Standard: IEC60076
Product Introduction
When the system is delta connection or star connection with the neutral point can not be drawn out, the earthing transformer can draw out the neutral point to add arc suppression coil or resistance. This kind of transformer adopts Z type connection (or zigzag type connection), which is different from the ordinary transformer: the coils of each phase are divided into two groups and wound on the magnetic column in the opposite direction. The advantage of this connection is that the zero-sequence magnetic flux can circulate along the magnetic column, while the zero-sequence magnetic flux of the ordinary transformer is along the leakage magnetic flux. Therefore, the zero sequence impedance of the Z-type earthing transformer is very small (about 10), while the zero sequence impedance of the ordinary transformer is much larger. According to regulations, when ordinary transformers with arc suppression coils are used, their capacity shall not exceed 20% of the transformer capacity. Z-type transformers can be equipped with 90% to 100% capacity arc suppression coils. Besides, earthing transformers can also carry secondary loads, which can replace station transformers to save costs.
Technical Parameter
DKSC10-400/35 Earthing Dry Type Transformer 
Technical Specification Data
Rated capacity (kVA)
400
Off-load loss (W)
1500
Zero sequence impedance (Zn)
170
Neutral point current
20A
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