CN202433479U - 一种大容量it电力并联回路接地故障定位装置 - Google Patents

一种大容量it电力并联回路接地故障定位装置 Download PDF

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CN202433479U
CN202433479U CN2011205087840U CN201120508784U CN202433479U CN 202433479 U CN202433479 U CN 202433479U CN 2011205087840 U CN2011205087840 U CN 2011205087840U CN 201120508784 U CN201120508784 U CN 201120508784U CN 202433479 U CN202433479 U CN 202433479U
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power
cable
fault
current
positioning device
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叶小松
王金全
邢鸣
丁建兴
唐友怀
徐晔
沈巍
崔陈华
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91053 Unit Of Chinese Pla
Wang Jinquan
Jiangsu Zhenan Power Equipment Co Ltd
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Jiangsu Zhenan Power Equipment Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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Abstract

一种大容量供电并联回路接地故障定位装置，供电系统的输电与受电两处之间的输电母排之间并联了n条相同规格的电缆，设有直流信号源、限流电抗L，直流信号源和限流电抗L串联至IT电力系统配电变压器的中性点，并在每条并联的电缆首端装设断路器QF，在并联的电缆末端装设负荷开关K和霍尔电流互感器CT。本实用新型通过提出的IT电力系统配电变压器的中性点和信号源的接入，对大容量IT电力系统并联回路接地故障定位，能对故障线路进行准确的定位，可靠性高并方便在不影响供电条件下更换故障电缆，在大功率IT电力系统中应用尤其重要。

Description

一种大容量IT电力并联回路接地故障定位装置
技术领域
本实用新型涉及一种大容量IT电力系统并联回路接地故障定位装置。
技术背景
当IT电力系统（供电行业内指无中心导体的常用供电系统）内负荷容量过大时，某段输电线路如果仅使用单条电缆，其载流量无法满足要求，必须将多条相同规格的电缆并联使用。如果在并联的多条电缆中有一条发生了接地故障，IT电力系统的绝缘监测装置能够报警，选线装置也可以指示出故障线路，但如何从多条电缆中选出故障的电缆是一项难题，目前未有专门技术的公开。
实用新型内容
本实用新型的目的是，提出一种大容量IT电力系统并联回路接地故障定位装置，即通过注入直流电流来查找故障线路与故障点。
本实用新型的技术方案是：大容量IT电力系统并联回路接地故障定位装置，IT电力系统的输电与受电两处之间的输电母排之间并联了n条相同规格的电缆，设有直流信号源、限流电抗L，直流信号源和限流电抗L串联至IT电力系统配电变压器的中性点，并在每条并联的电缆首端装设断路器QF，在并联的电缆末端装设负荷开关K和霍尔电流互感器CT。直流信号源DC用于提供故障回路电源，限流电抗L用来保护直流信号源，断路器QF和负荷开关K用来投切每一条电缆，霍尔电流互感器CT用于检测每条电缆上是否流过故障电流；直流注入源的投切、断路器QF的开合、霍尔电流传感器的检测均可通过现场总线结构在上位机集中控制。当n条电缆中第m条电缆发生接地故障时，注入的直流信号可通过限流电抗L——各线路上的阻抗——接地电阻R——大地构成故障回路，故障直流电流可流经每一条线路末端装设的CT，所有的霍尔电流互感器都能感应出故障电压，仅如此实施还不能指示出具体哪一条电缆故障。此时并联电缆中某条电缆发生接地故障，所有CT均感应出故障电压，指示故障。n常用4-10根。
断开QF1，检测CT1，CT1未感应出故障电压，证明电缆1无故障，闭合QF1；
断开QF2，检测CT2，CT2未感应出故障电压，证明电缆2无故障，闭合QF2；
直到依次断开QFn，检测CTn，CTn感应出故障电压，上位机指示电缆n故障，保持QFn断开；进一步断开故障电缆n末端的负荷开关Kn，此时故障电缆n已不再带电，靠其余的电缆保持系统IT电力供应，更换该电缆后再次闭合QFn和Kn，恢复第n条电缆工作。
本实用新型有益效果是：通过提出的IT电力系统配电变压器的中性点和信号源的加入，对大容量IT电力系统并联回路接地故障定位，能对故障线路进行准确的定位，可靠性高并方便在不影响供电条件下更换故障电缆，在大功率IT电力系统中应用尤其重要。
附图说明
图1本实用新型电路图。
具体实施方式
本实用新型实施方式如图所示，IT电力的输电和受电两处母排之间并联了n条相同规格的电缆。由IT电力系统和地之间接入的一直流源DC，设有保护直流信号源的限流电抗器L，安装与电缆首端的断路器QF，安装与电缆末端的的负荷开关K和霍尔电流互感器CT，控制上述设备的上位机等组成。
具体需要一个直流信号源，通过一个限流电抗L注入配电变压器的中性点，并在每条并联电缆的首端装设断路器QF，在电缆末端装设负荷开关K和霍尔电流互感器CT。直流信号源DC用于提供故障回路电源，限流电抗用来保护直流信号源，断路器QF和负荷开关K用来投切每一条电缆，电流互感器CT用于检测每条电缆上是否流过故障电流。直流注入源的投切、断路器QF的开合、霍尔直流传感器的检测均可通过现场总线结构在上位机集中控制。
当第n条电缆发生接地故障时，注入的直流信号可通过限流电抗L——各线路上的阻抗——接地电阻R——大地构成故障回路，故障直流电流可流经每一条线路末端装设的CT，所有的霍尔电流互感器都能感应出故障电压，仅如此实施还不能指示出具体哪一条电缆故障。该方法立足于逐条检测电缆上的接地故障，需要进一步保证本电缆故障时，本电缆末端的CT确实能可靠感应出故障电压，其具体实施流程如下(假设接地故障发生在第n条电缆电缆上)：
1.并联电缆中某条电缆发生接地故障，所有CT均感应出故障电压，指示故障；
2.断开QF1，检测CT1，CT1未感应出故障电压，证明电缆1无故障，闭合QF1；
3.断开QF2，检测CT2，CT2未感应出故障电压，证明电缆2无故障，闭合QF2；
……
n.断开QFn，检测CTn，CTn感应出故障电压，上位机指示电缆n故障，保持QFn断开；
当已经定位到故障电缆且需要更换电缆时，可进一步断开故障电缆n末端的负荷开关Kn，此时故障电缆n已不再带电，靠其余的电缆保持系统IT电力供应，更换该电缆后再次闭合QFn和Kn，恢复第n条电缆工作。本实用新型可检测并联电缆上的接地故障，并定位到具体的某根电缆上。
整个方案可在不切断系统供电的情况下正确指示故障，并排除故障，维持了IT电力系统供电可靠性高的优势。

Claims (1)

1.一种大容量供电并联回路接地故障定位装置，供电系统的输电与受电两处之间的输电母排之间并联了n条相同规格的电缆，其特征是设有直流信号源、限流电抗L，直流信号源和限流电抗L串联至IT电力系统配电变压器的中性点，并在每条并联的电缆首端装设断路器QF，在并联的电缆末端装设负荷开关K和霍尔电流互感器CT。
CN2011205087840U 2011-12-09 2011-12-09 一种大容量it电力并联回路接地故障定位装置 Expired - Lifetime CN202433479U (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105229885B (zh) * 2014-03-17 2017-06-09 三菱电机株式会社 电力供给控制装置及可编程逻辑控制器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105229885B (zh) * 2014-03-17 2017-06-09 三菱电机株式会社 电力供给控制装置及可编程逻辑控制器

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