氧化锌电阻片Ф25

氧化锌电阻片Ф25

氧化锌避雷器是目前国际最先进的过电压保护器。其核心元件电阻片主要采用一氧化锌为主配方制成,与传统碳化硅避雷器相比,大大改善了电阻片的伏安特性。提高了过电压通流能力,起到了对线路的保护作用。

当避雷在正常工作电压下,流过避雷器的电流仅微安级,当遭受过压时,避雷器优异的非线性发挥作用,流过避雷器瞬间增大到数千安培以下,避雷器处于导通状态,释放过电压能量,从而有效地限制了过压对输变设备的损害。 用途特点:氧化锌避雷器用保护交流电力和设备遭大所过电压和操作过电压损坏。

氧化锌电阻片技术参数

Zinc Oxide Varistor Technical Parameters

 

型号

 

 

标称放电电流

 

电位梯度

 

最大残压比(U5KA/D.C U1mA

电流耐受能力

老化系数

Current impulse with stand capability

Type

Nominal discharge current

 Potential gradient

Max.ratio of residual voltage

Current impulse with stand capability

Kct

4/10us

2ms

kA

V/mm

kA

A

Ф35×3.5

2.5

220±10

1.9

10

100

/

Ф30×25~31

5

225±10

1.85

65

100

1.05

Ф32×25~31

5

225±10

1.85

65

100

1.05

Ф35×25~31

5

225±10

1.85

65

150

1.05

Ф40×25~31

10

220±10

1.83

100

250

1.03

Ф42×25~25

10

220±10

1.83

100

250

1.03

Ф48×25~25

10

215±10

1.8

100

400

1.03

Ф56×21

10

210±10

1.75

100

600

1.02

Ф72×21

10

205±5

1.68

100

800

1.02

Ф85×21

20

200±5

1.65

100

1000

1.02

Ф115×21

20

190±5

1.63

100

1500

1.02

• Wide voltage range selection – from 14 VRMS to 680 VRMS.
This allows easy selection of the correct component for
the specific application.
• High energy absorption capability with respect to size of
component.
• Response time of less than 20 ns, clamping the transient
the instant it occurs.
• Low stand-by power – virtually no current is used in the
stand-by condition.
• Low capacitance values, making the varistors suitable for
the protection of digital switching circuitry.
• High body insulation – an ochre coating provides
protection up to 2500 V, preventing short circuits to
adjacent components or tracks.
• Available on tape with accurately defined dimensional
tolerances, making the varistors ideal for automatic
insertion.
• Approved to UL 1449 edition 3 (file number: E332800) and
manufactured using UL approved flame retardant
materials.
• Completely non flammable, in accordance with IEC, even
under severe loading conditions.
• Non porous lacquer making the varistors safe for use in
humid or toxic environments. The lacquer is also resistant
to cleaning solvents in accordance with IEC 60068-2-45.