2022 High quality Winding Surge Arrestor Core - High Quality Winding Mov Surge Arrestor Core Eci Have Own Manufacturing Plan & Supply Globally – EC Insulators

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2022 High quality Winding Surge Arrestor Core - High Quality Winding Mov Surge Arrestor Core Eci Have Own Manufacturing Plan & Supply Globally – EC Insulators Detail:

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Main technical data for 10kA ZnO varistor inner core

Figure No.	ZnO varistor inner core specification	Rated Voltage (kV)	MCOV(kV)	Impulse current residual voltage			2ms Rectangular current impulse withstand (A)	4/10us High current impulse withstand (kA)
Figure No.	ZnO varistor inner core specification	Rated Voltage (kV)	MCOV(kV)	1/4us Lightning impulse current（kV）	8/20 us Lightning impulse current（kV）	30/60us Lightning impulse current（kV）	2ms Rectangular current impulse withstand (A)	4/10us High current impulse withstand (kA)
1	Φ44×90	3	2.55	11.3	9	8.9	250	100
2	Φ44×120	6	5.1	22.6	18	16.8	250	100
3	Φ44×120	9	7.65	33.7	27	23.8	250	100
5	Φ44×150	10	8.4	36	30	23	250	100
6	Φ44×150	11	9.4	40	33	27	250	100
7	Φ44×150	12	10.2	42.2	36	30	250	100
8	Φ44×180	15	12.7	51	45	38.5	250	100
9	Φ44×210	18	15.3	61.5	54	46.2	250	100
10	Φ44×240	21	17	71.8	63	54.2	250	100
11	Φ44×270	24	19.5	82	72	62	250	100
12	Φ44×300	27	22	92	81	69.8	250	100
13	Φ44×330	30	24.4	102	90	79	250	100
14	Φ44×330	33	27.5	112	99	86.7	250	100
15	Φ44×360	36	29	123	108	92.4	250	100

Note: We can design and make products according to customer’s specific requirements.

Over voltages in power system may occur due to lightning or switching operation. These overvoltages could reach dangerous amplitudes for power system apparatus. To protect the system electrical equipment and to guarantee an economic and reliable operation, surge arresters are applied in almost all types of electrical power network. Gapless zinc oxide (ZnO) surge arresters are widely used. The surge arresters are usually connected between the phase and ground terminals. They limit the voltage level in equipments such as transformers below the withstand voltage level.

The time axis is divided into the range of lightning overvoltage in microsecond, switching overvoltage in millisecond and temporary overvoltage in second. In the lightning overvoltage and switching overvoltage range, the magnitude of overvoltage can reach several per unit if the system is without arrester protection. Arrester could limit overvoltage below withstand voltage of equipment. This phenomenon clearly shows the importance of arresters for lightning overvoltage protection.
Construction of Zinc Oxide Surge / Lightening Arrester:
The construction of ZnO Lightening Arresters is very simple. They consist of an insulating housing which is made of porcelain and the inner column is made of the ZnO blocks as shown in Figure below.

ZnO block provide the Voltage- Current non-linear characteristics which serves the main purpose for the protection from overvoltage. Thus we can say that ZnO block has non-liner resistivity.

Voltage Current Characteristics of Zno Block:

Figure below shows the V-I characteristics of ZnO element which are divided into three regions, being low current region (A), operating region (B) and high current region (C).

p-d-1

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18kv 10ka Surge Arrestor