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surge protection device

A surge protection, power grid technology, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as the inability to control the continuous current of the power grid

Inactive Publication Date: 2015-09-30
PHOENIX CONTACT GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Conventional spark gaps have low arcing voltages and are therefore not able to control continuous grid current
[0010] These conventional spark gaps extinguish the arc at zero crossings of the AC voltage (mains voltage), but trigger backup fuses especially when used on high power mains

Method used

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Examples

Experimental program
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Embodiment Construction

[0047] figure 1 Displays the surge protective device (SPD).

[0048] The surge protection device SPD has a spark gap (SG) and a temperature-dependent resistance element R connected in series with the spark gap SG, the temperature-dependent resistance element R having a positive temperature coefficient.

[0049] The spark gap SG has a certain holding current.

[0050] On the one hand, the dimensioning of the resistive element R is such that when the switching temperature is reached, the current is limited so that the holding current of the spark gap is reduced and cut off. On the other hand, the dimensioning of the resistive element R is such that in the event of a transient event, the switching temperature is not reached.

[0051] Thanks to this embodiment, it is possible on the one hand to provide protection against transient events by using an effective spark gap SG and, on the other hand, to ensure grid continuous current extinguishing capability by using a properly sized...

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PUM

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Abstract

A surge protection device (SPD) includes a spark gap (SG) and in series to the spark gap (SG) a temperature-dependent resistance element (R) with positive temperature coefficient, wherein the spark gap (SG) has a certain holding current, wherein the resistance element (R) is sized such that when a switching temperature is reached, the current is limited such that the holding current of the spark gap is undercut and is switched off, and wherein the resistance element is sized such that in the case of a transient event, the switching temperature is not reached.

Description

technical field [0001] The invention relates to a surge protection device. Background technique [0002] Type 1 surge protective devices are typically used on sensitive power mains. [0003] These surge protection devices must divert most of the power from transient events (also known as overvoltage events). [0004] These transient events include, for example, lightning strikes. Transient events typically occur on a time scale of less than 1 ms. [0005] Transient events of this type are formally modeled as eg a 10 / 350 μs reference surge current in the kA range. [0006] Often varistors and / or spark gaps are used as surge protection. [0007] However, when using these varistors or spark gaps, there is also a grid follow current caused by a low impedance discharge path. [0008] However, surge protective devices are also used to prevent or limit and cut off such continuous grid currents without triggering of the surge protective device or the backup fuse of the protecte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02H02H5/04
CPCH02H9/048H02H9/042H02H9/041H02H9/04
Inventor J·塞尔尼T·梅耶斯R·迪尔斯
Owner PHOENIX CONTACT GMBH & CO KG