Feature of HYB (W) -12/0.4 Outdoor Box Type Transformer Substation/Voltage Transformer (American) 
HYB(W)-12/0.4 box type transformer substation/Voltage Transformer is the compact distributing equipment comprising high voltage switchgear, distributing transformer, low voltage distributing equipment and electric energy measurement equipment, etc. Which are arranged into an organic whole according to the certain circuit scheme. This equioment is the complete transformer substation used for receiving and distributing electric energy at three-phase AC system of rated voltage 10/0.4 KV in the following fields such as urban public distribution, tall bulding and so on.

Item	On the side of high voltage	Transformer	On the side of low voltage
Rated working capability		50-1250 KVA
Rated working voltage	10 KA	10/0.4 KV	0.4 KV
Rated working current	400-630 A		630-2500 A
Rated short-circuit breaking current	50 KA		2.5-4 KA
Rated making current	40 KA
Rated thermal stability current (virtual value)	16 KA/2 s		15 30 KA/1 s
1 min power frequency withstand voltage	To earth 42 KV	Dry type 28 KV	2.0 KV 2.5 KV
	Between open contacts 48 KV	Oil immersed 35 KV
Lightning impulse withstand voltage	To earth 75 KV	75KV
	Between open contacts 85 KV
Protection level	IP3X	IP2X	IP3X
Noise	Oil immersed transformer 55dB Dry type transformer 65dB