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Electrical circuit with incendive arc prevention

A circuit and arc technology, applied in the field of Ethernet systems, can solve problems such as infeasible Ethernet cables

Inactive Publication Date: 2010-12-22
PEPPERL FUCHS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As such, this means is not feasible for ethernet cables

Method used

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  • Electrical circuit with incendive arc prevention
  • Electrical circuit with incendive arc prevention
  • Electrical circuit with incendive arc prevention

Examples

Experimental program
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Embodiment Construction

[0064] First refer to image 3 , understanding that the arc will typically exhibit no less than twenty ohms, and no more than seventy ohms, during the first ten microseconds. Thus, the arc will not ignite for the first ten microseconds in most cases, although it will be larger in some cases and smaller in others.

[0065] Therefore, if an arc is to be extinguished, it must be detected and appropriate action taken within the first 10 microseconds or less. Figure 4 showed that the cable propagation delay to account for arc detection and arc exhaustion must be within 10 microseconds so the arc does not ignite. This puts the cable propagation length limit at five microseconds. Therefore, if a cable has a propagation time of six microseconds per kilometer, the length of the cable must be limited to 830 meters.

[0066] However, the electronic detection of arcs takes some time to operate effectively, and therefore in practice a cable length of four hundred meters is considered a...

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PUM

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Abstract

An electrical circuit comprising a power supply, a load, a first pair of parallel positive cables between the power supply and the load, a first pair of parallel negative cables between the load and the power supply, and incendive arc prevention means, in which the incendive arc prevention means comprises monitoring means adapted to monitor the first pair of positive cables and the first pair of negative cables, and to detect if the current and / or voltage in one of the first pair of positive cables deviates from the other, and if the current and / or voltage in one of the first pair of negativecables deviates from the other, and in which the incendive arc prevention means comprises a control means adapted to fully or partially isolate the power supply from the first pair of positive cablesand the first pair of negative cables if the monitoring means detects that the current and / or voltage of one of the first pair of positive cables has deviated from the other, or if the current and / orvoltage of one of the first pair of negative cables has deviated from the other.

Description

technical field [0001] The present invention relates to a circuit with ignition arc protection, particularly but not exclusively for use with intrinsically safe Ethernet systems. Background technique [0002] Traditional intrinsically safe electrical systems, as well as newer arc detection systems, use two wires for power and signal transmission, and use only these two wires for energy confinement and fault detection. [0003] US 5982594 in the name of KEVIN M HUCZKO discloses an intrinsically safe power supply unit that uses only two wires to transmit power. A direct output crowbar circuit and discrete impedance elements are used to dissipate and limit energy in the power supply unit that would otherwise cause external faults, and an adaptive cutoff circuit differentiates between rated load conditions including load changes from external faults. [0004] WO 2006 / 003445 in the name of PEPPERL AND FUCHS discloses a circuit using two wires for power and signal transmission. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/00H04L12/10
Inventor G·罗格尔R·基特切纳尔
Owner PEPPERL FUCHS GMBH