27.5kV Gapless Lightning Porcelain Surge Arrester Metal Oxide

27.5kV Railway Porcelain Gapless Surge Arrester

Product introduction:

Normally there are 2 kinds of DC SA for railway system:

1/ 750V, Ur=1.0kV, 8/20μs residual voltage at 20kA: 2.4kV;

2/ 1500V, Ur=2.0kV, 8/20μs residual voltage at 20kA: 4.8kV.

A porcelain surge arrester is a type of surge arrester that features a housing made of porcelain, a ceramic material. This type of surge arrester is also known as a ceramic surge arrester. 

Porcelain surge arresters are designed to protect electrical equipment and systems from voltage surges or transients caused by lightning strikes, switching operations, or other transient events. The porcelain housing provides mechanical support and insulation to the internal components of the surge arrester.

Item	Description		Offered	Offered	Offered
1	Manufacture/ Country of Origin		Xi'an Shendian/ China
2	Model		Y5WT-42/105	Y5WT-42/110	Y5WT-42/120
3	Applicable standard		IEC 60099-4	IEC 60099-4	IEC 60099-4
4	Type		Outdoor, ZnO, gapless
5	Norminal voltage of system	kV	27.5	27.5	27.5
6	Earthing system		Effectively earthed
7	Rated frequency	Hz	50/60	50/60	50/60
8	Rated voltage of SA	kV	42	42	42
9	Maximum continuous operating voltage	kV	31.5	31.5	34
10	Power frequency reference voltage	kV	58	60	65
11	- at reference current of Note: State peak value or rms.	mA (D.C)	1	1	1
12	Nominal discharge current	kA	5	5	5
13	(a) Lightning impulse	kV	≤105	≤110	≤120
	(b) Steeping impulse	kV	≤118	≤127	≤138
	(c) Switching impulse	kV	≤89	≤94	≤98
14	Material employed in series non-linear resistor		ZnO etc.	ZnO etc.	ZnO etc.
15	- Material		Brown Porcelain	Brown Porcelain	Brown Porcelain
	- Minimum creepage distance	mm/kV	25/31	25/31	25/31
16	- HV terminal		hot zip screw	hot zip screw	hot zip screw
	- earth terminal		hot zip screw	hot zip screw	hot zip screw
17	Diameter of bushing sheds	mm	232	232	232
18	Height	mm	995	995	995

 

 

Schematic diagram:

 

 

 

Reference:

1/ Shendian MOA is widely used in China EHV (Extra hight voltage) projects of State Grid, Southern Power Grid.

2/ Supplied MOA to ABB/Siemens/Schneider more than 20 years, as well as other capacitor/switchgear manufacturers.

3/ Shendian MOA has been exported to more than 30 counties all over the world.