CN111665418A - 一种检测电力传输线路中故障的方法 - Google Patents

一种检测电力传输线路中故障的方法 Download PDF

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CN111665418A
CN111665418A CN202010689911.5A CN202010689911A CN111665418A CN 111665418 A CN111665418 A CN 111665418A CN 202010689911 A CN202010689911 A CN 202010689911A CN 111665418 A CN111665418 A CN 111665418A
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transmission line
line
fault
error correction
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林立
黄思龙
吴宗洋
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New Three Technologies Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/185—Electrical failure alarms
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
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    • 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

本发明公开一种检测电力传输线路中故障的方法，(1)采用非接触线圈感应方式采集电力线路信号；(2)通过数字相关滤波处理采集到的信号数据，并计算相位，通过判定相位是否稳定来确定是否有线路故障；(3)若有线路故障，用无线电信号来传递报警信息，在通信中采用前向纠错方法。

Description

一种检测电力传输线路中故障的方法
技术领域
本发明涉及电力传输技术领域，具体涉及一种检测电力传输线路中故障的方法。
背景技术
快速、准确的故障诊断是迅速隔离故障和恢复供电的前提，对于维护传输电路的安全运行具有重要意义，而传输线路故障诊断是长期以来难以解决的课题。
目前检测电力线路故障常用的判定准则是检测的信号低于比较器设定门限，这种方法判定不准确，因为在电力线路负载比较小，或者存在比较强干扰时，或者使用电池供电时，在电池电压降低的过程中，会发生漏报、误报的情况。
发明内容
本发明旨在解决现有技术的缺陷，提供一种检测电力传输线路中故障的方法。
本发明的技术方案如下：
一种检测电力传输线路中故障的方法，包括以下步骤：
(1)采用非接触线圈感应方式采集电力线路信号；
(2)通过数字相关滤波处理采集到的信号数据，并计算相位，通过判定相位是否稳定来确定是否有线路故障；
(3)若有线路故障，用无线电信号来传递报警信息，在通信中采用前向纠错方法。
步骤(2)所述的计算相位的方法如下：
A＝∑e(k).sin(2kπ/n)
B＝∑e(k).cos(2kπ/n)
相位角
Figure BDA0002588957480000011
其中sin(2kπ/n)和cos(2kπ/n)是由软件产生的标准正弦、余弦信号。
步骤(3)所述的前向纠错方法采用里德所罗门编码，底层采用RS(15，11)码，然后交织，交织后用一个码间距为3可以纠正1bit错误的简单3bit编码，同时实现交织后的短编码和白化功能。
所述的前向纠错方法对传输的数据进行CRC校验，采用CRC-CCITT，其生成多项式为：g(x)＝X(16)+X(12)+X(5)+1。
本发明的有益效果在于：
1.本发明所述的方法，由于采集电力线路信号采用非接触线圈感应的方式，不用与线路接触，因此不受线路负载及干扰的影响；由于采用数字相关滤波处理，计算相位，通过判定相位是否稳定来确定是否有线路故障的方法，抗干扰能力强，灵敏度高，并且信号处理电路简单；同时利用无线电信号传递报警信息，在通信中采用前向纠错技术，提高了传输的稳定性，提高了通信距离，大大降低误报、漏报情况的发生。
具体实施方式
下面对本发明作进一步的说明。
一种检测电力传输线路中故障的方法，包括以下步骤：
(1)采用非接触线圈感应方式采集电力线路信号；
(2)通过数字相关滤波处理采集到的信号数据，并计算相位，通过判定相位是否稳定来确定是否有线路故障；相关滤波能够出去信号中的直流和高频分量，具有很好的抗干扰能力，在没有断线故障时，以20mS为周期，连续几次计算的相位结果是相近的，如果计算结果差别大，超过设定的误差范围，就可以判定为线路故障；
(3)若有线路故障，用无线电信号来传递报警信息，在通信中采用前向纠错方法。
步骤(2)所述的计算相位的方法如下：
A＝∑e(k).sin(2kπ/n)
B＝∑e(k).cos(2kπ/n)
相位角
Figure BDA0002588957480000021
其中sin(2kπ/n)和cos(2kπ/n)是由软件产生的标准正弦、余弦信号，直接将输入信号通过过零比较器变成包含噪声的50Hz数字脉冲，在密集采样时，相比模拟采样不会影响计算的结果。
步骤(3)所述的前向纠错方法采用里德所罗门编码，底层采用RS(15，11)码，然后交织，交织后用一个码间距为3可以纠正1bit错误的简单3bit编码，同时实现交织后的短编码和白化功能。
所述的前向纠错方法对传输的数据进行CRC校验，采用CRC-CCITT，其生成多项式为：g(x)＝X(16)+X(12)+X(5)+1；前向纠错方法的编码流程为：通过采集的原始数据计算CRC校验码，然后进行RS(15，11)编码，接着进行帧内交织，交织后纠正编码，然后向主控制器发送处理后的信号。
采用主控制器来接收和发射采集到的电力线路信号，用单片机作为主控制器，单片机处于休眠状态，看门狗定时器会去唤醒，然后打开信号采集电路工作，并同时进行相关计算，判定是否发生断线故障，如果有报警信息，主控制器将打开无线发射机的电源，通过无线方式传送报警信息给主机。
本发明所述的方法，由于采集电力线路信号采用非接触线圈感应的方式，不用与线路接触，因此不受线路负载及干扰的影响；由于采用数字相关滤波处理，计算相位，通过判定相位是否稳定来确定是否有线路故障的方法，抗干扰能力强，灵敏度高，并且信号处理电路简单；同时利用无线电信号传递报警信息，在通信中采用前向纠错技术，提高了传输的稳定性，提高了通信距离。

Claims (4)

1.一种检测电力传输线路中故障的方法，其特征在于包括以下步骤：
(1)采用非接触线圈感应方式采集电力线路信号；
(2)通过数字相关滤波处理采集到的信号数据，并计算相位，通过判定相位是否稳定来确定是否有线路故障；
(3)若有线路故障，用无线电信号来传递报警信息，在通信中采用前向纠错方法。
2.如权利要求1所述的检测电力传输线路中故障的方法，其特征在于，步骤(2)所述的计算相位的方法如下：
A＝∑e(k).sin(2kπ/n)
B＝∑e(k).cos(2kπ/n)
相位角
Figure FDA0002588957470000011
其中sin(2kπ/n)和cos(2kπ/n)是由软件产生的标准正弦、余弦信号。
3.如权利要求1所述的检测电力传输线路中故障的方法，其特征在于，步骤(3)所述的前向纠错方法采用里德_所罗门编码，底层采用RS(15,11)码，然后交织，交织后用一个码间距为3可以纠正1bit错误的简单3bit编码，同时实现交织后的短编码和白化功能。
4.如权利要求3所述的检测电力传输线路中故障的方法，其特征在于，所述的前向纠错方法对传输的数据进行CRC校验，采用CRC-CCITT，其生成多项式为：g(x)＝X(16)+X(12)+X(5)+1。
CN202010689911.5A 2020-07-17 2020-07-17 一种检测电力传输线路中故障的方法 Pending CN111665418A (zh)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140347065A1 (en) * 2013-05-23 2014-11-27 Pentair Thermal Management, Llc Sub-Harmonic Arc Fault Detection System and Method
CN105067948A (zh) * 2015-07-15 2015-11-18 山东泰景电力科技有限公司 一种小电流接地选线装置及单相接地检测方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140347065A1 (en) * 2013-05-23 2014-11-27 Pentair Thermal Management, Llc Sub-Harmonic Arc Fault Detection System and Method
CN105067948A (zh) * 2015-07-15 2015-11-18 山东泰景电力科技有限公司 一种小电流接地选线装置及单相接地检测方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
郝为民,李建岐,周琰,王洪: "输配电线路断线故障检测的一种新方法", 《河北电力技术》 *

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Application publication date: 20200915