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27.5kV Gapless Lightning Porcelain Surge Arrester Metal Oxide

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27.5kV Gapless Lightning Porcelain Surge Arrester Metal Oxide

Country/Region	china
Categories	Lightning Rod

Product Details

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.

Porcelain surge arrester is of high mechanical strength, longer creepage distance, excellent electrical insulation performance, strong dielectric strength, tracking resistance, high- and low-temperature resistance and sandstorm resistance. The multi-sealing structure of the housing provides high sealing performance and long service life.

Porcelain surge arresters have been widely used in power distribution systems, substations, and other high-voltage applications. They are known for their mechanical strength, excellent electrical insulation properties, and resistance to environmental factors such as moisture, UV radiation, and pollution. Porcelain housing provides robust and durable protection for the internal surge suppression elements.

Shendian takes lead of SA in China, its product is widely used in State Grid Corporation of China (SGCC) and China Southern Power Grid (CSG), among them including many extraordinary projects: (1) 1,000kV UHV Southeast Shanxi Substation of 1,000kV Southeast Shanxi - Nanyang - Jingmen UHVAC Pilot Demonstration Project, (2) Extension Works of 1,000kV Nanyang Switching Station of 1,000kV Southeast Shanxi - Nanyang - Jingmen UHV AC Pilot Demonstration Project, (3) South Hami Converter Station of ±800kV Hami- Zhengzhou UHVDC Electricity Transmission Project, (4) 750kV Qinghai Qaidam Substation and 500kV Baoji - Deyang DC Electricity Transmission Project, as well as (5) DC Project of 500kV Hechi Substation of CSG, (6) DC Project of 500kV Anshun Substation of Guizhou Power Grid Company and 330kV Sanxing Substation in Xi'an High-tech Zone.

Advantage:

1/ High mechanical strength;

2/ Longer creepage distance;

3/ High dielectric insulation level;

4/ Tolerance to high/low temperature;

5/ Anti-corrosion and anti-aging;

Standard Technical Data:

Below info. only for your reference, all data shall be specified and determined by technical specification and customer demand.

A: Nominal system voltage ≤55kV

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
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
15	- Minimum creepage distance	mm/kV	25/31	25/31	25/31
16	- HV terminal		hot zip screw	hot zip screw	hot zip screw
16	- 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