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Noise propagation immunity of multi-string arc fault detection device

An arc and current sensor technology, applied in the direction of measuring devices, circuit devices, emergency protection circuit devices, etc., to achieve the effect of enhancing reliability

Active Publication Date: 2015-06-24
SENSATA TECHNOLOGIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, heretofore known systems and methods for detecting arcs in power systems generally do not have the ability to separate series arcs, parallel arcs, ground fault arcs, etc. Differentiate between noise generated by DC load switches, DC-AC load switches, DC disconnect switches, radio frequency (RF) pickups, DC power line communications, and more

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  • Noise propagation immunity of multi-string arc fault detection device
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  • Noise propagation immunity of multi-string arc fault detection device

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Embodiment Construction

[0027] U.S. Patent Application 13 / 836,345, filed March 15, 2013, entitled "HOME RUN ARC DETECTION AT THE PHOTOVOLTAIC STRING LEVEL USING MULTIPLE CURRENT SENSORS," and filed November 16, 2012, entitled "SYSTEMS AND METHODS OF DISCRIMINATING DC ARCS AND LOAD SWITCHING NOISE", the entire disclosure of US Patent Application 13 / 679,039 is hereby incorporated by reference.

[0028] Figure 1a A typical DC power system, in particular, a photovoltaic (PV) system 100 is depicted. Such PV systems have increasingly been used in domestic and industrial applications ranging from charging batteries to providing power to the AC grid. PV system 100 includes a plurality of PV modules (eg, solar panels) 101 . Such as Figure 1a As shown, PV modules 101.1-101.n are connected in series to form first PV string 102.1, PV modules 103.1-103.n are connected in series to form second PV string 102.2, and PV modules 105.1-105.n are connected in series to form second PV string 102.1. Three PV strings 1...

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Abstract

Systems and methods of detecting arcing in a DC power system that can provide improved noise propagation immunity. The system includes at least two current sensors for monitoring at least two current outputs, respectively. The current sensors have reverse polarities, and are configured and arranged in parallel to provide a combined current output signal. The current sensors monitor the respective current outputs, which are provided for monitoring by the current sensors over at least two adjacent conductors. If arcing occurs at a location on a first conductor, then arcing (adjacent conductor crosstalk), having an arc current signature like that of the arcing on the first conductor, can occur at a location on the other adjacent conductor. The system can effectively cancel out such adjacent conductor crosstalk within a photovoltaic (PV) system, thereby improving the capability of an arc fault detection device for detecting arcing at the PV string level.

Description

[0001] Cross References to Related Applications [0002] This patent application is a continuation-in-part (CIP) of U.S. Patent Application 13 / 836,345, filed March 15, 2013, entitled "HOME RUN ARC DETECTION AT THE PHOTOVOLTAIC STRING LEVEL USING MULTIPLE CURRENT SENSORS," which 13 / 836,345 is the CIP of US Patent Application 13 / 679,039, filed November 16, 2012, entitled "SYSTEMS AND METHODS OF DISCRIMINATING DC ARCS AND LOAD SWITCHING NOISE." technical field [0003] The present application relates generally to detecting arcs in electrical circuits, and more particularly to systems and methods for improving noise propagation immunity in arc fault detection devices for use in PV systems having multiple photovoltaic (PV) strings. Background technique [0004] In recent years, direct current power systems, such as photovoltaic (PV) systems, have been increasingly employed in domestic and industrial applications ranging from charging batteries to providing power to alternating c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272G01R31/40H02H1/0015H02H3/445H02S50/00H02S50/10Y02E10/50
Inventor 康建宏C·V·佩隆L·马丁K·W·卡瓦特
Owner SENSATA TECHNOLOGIES INC
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