Systems and apparatus for fault detection in dc power sources using ac residual current detection

A technology of residual current and fault detection circuit, applied in the field of power system, which can solve problems such as environmental pollution, ground fault, operation and safety problems

Active Publication Date: 2014-04-09
EATON INTELLIGENT POWER LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ground faults may occur in such systems due to environmental contamination, electrolyte le

Method used

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  • Systems and apparatus for fault detection in dc power sources using ac residual current detection
  • Systems and apparatus for fault detection in dc power sources using ac residual current detection
  • Systems and apparatus for fault detection in dc power sources using ac residual current detection

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Embodiment Construction

[0019] Specific embodiments of the subject matter of the invention will now be described with reference to the accompanying drawings. The inventive subject matter, although it may be embodied in many different forms, should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and The scope of the inventive subject matter is fully conveyed to those skilled in the art. In the figures, the same numerals indicate the same elements. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0020] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be...

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PUM

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Abstract

A fault in a DC power source, such as a battery string or a string of photovoltaic cells, is identified by detecting a change in an AC component of a residual current of the DC power source. In some embodiments, the DC power source is coupled to at least one DC bus and he methods further include generating an AC voltage on the at least one DC bus. For example, the DC power source may be coupled to a modulated DC bus of an uninterruptible power supply (UPS) system comprising an inverter having an input coupled to the DC bus. The inverter may be configured to generate an AC output voltage and the AC component has a frequency that is a harmonic of a fundamental frequency of the AC output voltage, such as a third harmonic of the fundamental frequency of the AC output voltage.

Description

technical field [0001] The subject matter of the present invention relates to power systems and methods, and more particularly to fault detection in power systems using DC power sources. Background technique [0002] A power conversion system for serving AC loads typically includes an inverter that generates an AC output from a DC voltage provided by a power source. For example, uninterruptible power supply (UPS) systems used to provide uninterrupted power in critical applications typically use batteries or other DC Provide backup power. Converters used to connect photovoltaic panels to AC power distribution systems also typically include inverters that operate on the DC power provided by the photovoltaic panels. Some UPS systems can also be designed to provide power from photovoltaic panels to AC loads, for example, as described in US Patent Application Serial No. 12 / 779,522, filed May 13, 2010. [0003] In many such applications, the DC power supply can also be operated...

Claims

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Application Information

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IPC IPC(8): G01R31/40
CPCG01R31/025G01R31/40G01R31/52H02S50/00Y02E10/50
Inventor G·W·小奥顿Y·刘D·达斯P·S·泰梅拉B·L·康普顿
Owner EATON INTELLIGENT POWER LIMITED
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