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Zone selective interlocking (ZSI) power distribution systems and methods of operating a zsi power distribution system

一种区域选择性、联锁系统的技术，应用在电力系统领域，能够解决多个电路或负载失去服务等问题

Active Publication Date: 2015-06-17
ABB AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multiple circuits or loads may be unnecessarily out of service if breakers are higher in the hierarchy trip

Method used

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  • Zone selective interlocking (ZSI) power distribution systems and methods of operating a zsi power distribution system
  • Zone selective interlocking (ZSI) power distribution systems and methods of operating a zsi power distribution system

Examples

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Embodiment Construction

[0032] Exemplary embodiments of a power distribution system and methods of operating a power distribution system are described in this specification. An exemplary power distribution system includes a plurality of circuit protection devices arranged in multiple layers in a zone selective interlock (ZSI) configuration. One or more downstream (eg, in a lower layer) circuit protection device is operable to output a blocking signal to one or more an upstream (for example, in a higher layer) circuit protection device. The circuit protection device is thus able to anticipate a current exceeding the protection threshold and may output a blocking signal before the current exceeds the threshold.

[0033] figure 1 Is a schematic block diagram of a portion of an exemplary ZSI power distribution system 100 showing a plurality of circuit protection devices 102 .

[0034] Each circuit protection device 102 is configured to control delivery of power from one or more power sources 104 to on...

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Abstract

Power distribution systems and methods are described. In one example, a method of determining by a first circuit protection device in a zone selective interlocking (ZSI) system whether to output a blocking signal to a second circuit protection device in the ZSI system is described. The method includes detecting, by a current rate of change sensor, a rate of change of a current flowing through the first circuit protection device. A trip unit receives a current rate of change signal from the current rate of change sensor. The current rate of change signal is proportional to the detected rate of change of the current flowing through the first circuit protection device. The trip unit determines whether to output the blocking signal to the second circuit protection device based, at least in part, on the current rate of change signal.

Description

technical field [0001] The present application relates generally to electric power systems, and more particularly, to zone selective interlocking (ZSI) power distribution systems and methods of operating and / or testing ZSI power distribution systems. Background technique [0002] Known power distribution systems include a plurality of switchgear lineups including circuit breakers each connected to one or more loads. The circuit breaker generally includes a trip unit that controls the circuit breaker based on the sensed current flowing through the circuit breaker. More specifically, the trip unit causes interruption of current flow through the circuit breaker if the current flow is outside acceptable conditions. [0003] For example, at least some known circuit breakers are programmed with one or more current thresholds (also referred to as "pickup" thresholds) that identify undesirable current levels for the circuit breaker. For example, if a fault draws current in excess ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/30H02H3/08H02H3/44H02H7/262H02H7/263
Inventor M. E. 瓦尔德斯
Owner ABB AS
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