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Arc flash detector

An arc flash, detector technology used in the use of electrical radiation detectors for photometry, electrical components, measurement circuits, etc.

Active Publication Date: 2011-01-05
ABB AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Also, most sensors become saturated at levels well below the levels that would emit an arc flash event

Method used

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Examples

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Embodiment Construction

[0024] Such as figure 1 As schematically shown in , an arc flash detector 100 according to an embodiment disclosed herein includes a light attenuating filter 110 , a light sensor 120 and a logic circuit 130 . Ambient light enters the light attenuating filter 110, which attenuates the ambient light by a predetermined percentage. The attenuated ambient light travels from the light attenuating filter 110 to the light sensor 120 . If the attenuated ambient light is of sufficient intensity to saturate the light sensor 120 , the light sensor 120 sends an output signal to the logic circuit 130 . Logic circuit 130 evaluates the output signal of light sensor 120 and generates its own output signal if it determines that an arc flash event has occurred. The output signal of logic circuit 130 is then used by another device to stop the arc flash, alert an operator and / or take other action. For example, the light sensor can be powered by a power source connected to it. Additionally, the...

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Abstract

The title of the invention is an arc flash detector. An arc flash detector (100) includes a light sensor (120), a light attenuating filter (110) in communication with the light sensor (120), a housing (140) disposed to support the light attenuating filter (110) and the light sensor(120), and a logic circuit (130) in communication with the light sensor (120). The logic circuit (130) is disposed to receive an output of the light sensor (120) and disposed to produce an output signal responsive to a predetermined intensity of light received by the light sensor (120). The light attenuating filter (110) is disposed to reduce the intensity of light received by the light sensor (120). The housing (140) is also disposed to retain the light sensor (120) and the light attenuating filter (110) at a fixed orientation.

Description

technical field [0001] The subject matter disclosed herein relates to arc flash detection and mitigation techniques, and in particular, detection devices used for this purpose. Background technique [0002] Power circuits and switchgear have conductors separated by insulation. In some areas, air spaces are often used as part or all of this insulation. Arcing can occur between conductors if the conductors are too close to each other, or if the voltage exceeds the insulation properties. The air or any insulation (gas or solid dielectric) between the conductors can become ionized, making it conductive, enabling arcing. Arc temperatures can reach as high as 20,000°C, vaporizing conductors and adjacent materials and releasing significant energy. [0003] An arc flash is the result of a rapid release of energy due to a phase-to-phase, phase-to-neutral, or phase-to-earth arcing fault. Arc flashes can produce high heat, intense light, pressure waves, and sound / shock waves. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/00
CPCH02H1/0023G01J1/22G01J1/44
Inventor G·W·罗斯克
Owner ABB AS
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