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1.发明公开A cable monitoring system with multiple branch terminations 失效Kabelüberwachungseinrichtungmit mehreren Verzweigungsendstellen
公开(公告)号：EP0748100A2
公开(公告)日：1996-12-11
申请号：EP96304177.7
申请日：1996-06-06
CPC分类号： H04M3/28 , G01R31/021
摘要： A novel method and apparatus are used for monitoring cables for wear and damage. The system is particularly applicable to a cable system with multiple branch terminations. The cables have detection conductors, for example the metal cable jackets (24) or other detection conductors extending the length of the cables (14). These are connected electrically at the splice points (16) in the system. At the end of each branch (14) and at the end of the main cable (12), the detection conductors (24) are each connected to a novel termination circuit (22). In the normal monitoring mode, the termination circuit (22) appears as an open circuit. A DC voltage is normally applied to the detection conductors. Any current is a result of current leakage at a resistive fault along the detection conductors. The termination circuits are activated by altering the DC voltage, e.g. by reversing the polarity and increasing the magnitude of the voltage. This causes the termination circuit (22) to perform a series of functional tests. These include a loop test which places a short across the end of the detection conductor for a timed period. The resulting high level loop current is used to calculate the total detection conductor resistance. A second test transmits a coded signal simulating a triggered splice sensor unit. The signal is detected and decoded to verify proper operation of end to end coded signaling after completing a test cycle, the termination circuit turns off and the next termination to be tested is addressed.
摘要翻译： 一种新颖的方法和装置用于监测电缆的磨损和损坏。 该系统特别适用于具有多个分支终端的电缆系统。 电缆具有检测导体，例如金属电缆护套（24）或延伸电缆（14）的长度的其它检测导体。 这些在系统中的接合点（16）处电连接。 在每个分支（14）的末端和主电缆（12）的末端，检测导体（24）各自连接到新的终端电路（22）。 在正常监视模式下，终端电路（22）显示为开路。 直流电压通常被施加到检测导体。 任何电流是沿着检测导体的电阻故障时的电流泄漏的结果。 通过改变直流电压来激活终端电路，例如， 通过反转极性并增加电压的大小。 这导致终端电路（22）执行一系列功能测试。 这些包括循环测试，其在检测导体的末端放置短时间段。 所得到的高电平回路电流用于计算总检测导体电阻。 第二测试发送模拟触发的接合传感器单元的编码信号。 在完成测试周期后，对信号进行检测和解码，以验证端到端编码信号的正常运行，终端电路关闭，下一个要测试的终端被寻址。
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2.发明公开A method for estimating the location of a cable break including means to measure resistive fault levels for cable sections 审中-公开用于估计电缆断开的位置和方法用于测量欧姆误差水平电缆件
公开(公告)号：EP1126283A1
公开(公告)日：2001-08-22
申请号：EP00301301.8
申请日：2000-02-18
发明人： Vokey, David E. , Loewen, Myron
IPC分类号： G01R31/08
CPC分类号： G01R31/088 , G01R31/026
摘要： A method and apparatus are used for locating cable breaks and resistive faults in cables, including fibre optic cables. The conductive shield or armour of the cable is divided into sections, usually at a splice. A step function voltage is applied to one end of the conductive shield. Remote sensors at the end of each section monitor the voltage and current as a function of time and at steady state. The measured data are encoded as current pulses and transmitted along the armour to the end of the cable. A computer at the cable end calculates from the measured voltages and currents the capacitance of each section of the shield. A broken section is identified by comparing the calculated and original capacitances of the sections and the distance along the broken section to the break is calculated from the calculated and original capacitances of the broken section. Resistive faults in the cable are located by calculating a fault resistance of each section of the shield from the measured steady state voltages and currents. A section containing a resistive fault is identified from the magnitude of the calculated fault resistance and the distance to the resistive fault is calculated from the measured steady state voltages and currents of the faulted section.
摘要翻译： 的方法和装置被用于定位电缆断裂和在电缆电阻故障，包括光纤电缆。 导电屏蔽体或电缆的铠装被分成部分底栖，通常在一个拼接。 甲阶跃函数电压被施加到导电屏蔽件的一端。 在每一部分的末端远程传感器监控的电压和电流作为时间的函数，并在稳定状态。 所测量的数据被编码为电流脉冲和反式沿铠装到电缆的端部mitted。 在电缆端部的计算机从所测量的电压和电流计算所述屏蔽件的每个部分的电容。 破碎的部分被识别通过比较所述部分的计算值和原始电容和沿虚线部分断裂的距离从原始和虚线部分的电容的计算计算值。 在电缆的电阻故障，通过计算由所测量的稳态电压和电流的屏蔽件的各部分的故障电阻位于。 含电阻性故障A节是从所计算的故障电阻的大小和到电阻故障的距离鉴定从测量的稳态电压和故障段的电流计算。
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公开(公告)号：EP1167986A3
公开(公告)日：2003-08-20
申请号：EP00309126.1
申请日：2000-10-17
发明人： Aminot, Gilles , Vokey, David E.
CPC分类号： G01R31/021
摘要： Open circuit faults in a cable are located by applying a step function DC voltage to one end of a conductor along the cable, for example the metallic shield along a fibre optic cable. The DC current along the conductor is measured over a sampling period and integrated to determine the capacitive charge on the cable. The distance between the end of the conductor and the open circuit fault is computed from the calculated charge and the known capacitance per unit length of the conductor. The DC current in the conductor is measured by sampling the current at a predetermined sampling frequency. The sampling frequency is preferably an integral multiple of the local AC mains power frequency, either 60 Hz or 50 Hz to eliminate the effect of induced AC voltages in the calculations. To eliminate the effects of a resistive fault, the method may include the steps of determining the conductor resistance and subtracting from the calculation of capacitive charge a DC fault current that is calculated from the conductor resistance and the DC voltage. An apparatus for carrying out the method is also disclosed.
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公开(公告)号：EP0748100B1
公开(公告)日：2000-01-05
申请号：EP96304177.7
申请日：1996-06-06
CPC分类号： H04M3/28 , G01R31/021
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公开(公告)号：EP1167986A2
公开(公告)日：2002-01-02
申请号：EP00309126.1
申请日：2000-10-17
发明人： Aminot, Gilles , Vokey, David E.
IPC分类号： G01R31/08
CPC分类号： G01R31/021
摘要： Open circuit faults in a cable are located by applying a step function DC voltage to one end of a conductor along the cable, for example the metallic shield along a fibre optic cable. The DC current along the conductor is measured over a sampling period and integrated to determine the capacitive charge on the cable. The distance between the end of the conductor and the open circuit fault is computed from the calculated charge and the known capacitance per unit length of the conductor. The DC current in the conductor is measured by sampling the current at a predetermined sampling frequency. The sampling frequency is preferably an integral multiple of the local AC mains power frequency, either 60 Hz or 50 Hz to eliminate the effect of induced AC voltages in the calculations. To eliminate the effects of a resistive fault, the method may include the steps of determining the conductor resistance and subtracting from the calculation of capacitive charge a DC fault current that is calculated from the conductor resistance and the DC voltage. An apparatus for carrying out the method is also disclosed.
摘要翻译： 电缆中的开路故障是通过沿着电缆向导体的一端施加阶梯功能的直流电压，例如沿光纤电缆的金属屏蔽。 在采样周期内测量沿导体的直流电流，并将其集成以确定电缆上的电容电荷。 导体端部与开路故障之间的距离由计算的电荷和导体每单位长度的已知电容计算得出。 通过以预定的采样频率对电流进行采样来测量导体中的直流电流。 采样频率优选为60Hz或50Hz的局部AC市电电源频率的整数倍，以消除计算中感应AC电压的影响。 为了消除电阻性故障的影响，该方法可以包括确定导体电阻并从电容充电的计算中减去由导体电阻和直流电压计算的直流故障电流的步骤。 还公开了一种用于执行该方法的装置。
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6.发明公开A constant current termination for cable locating tones 审中-公开KonstantstromkabelendverschluszfürKabellokalisierendensignalen
公开(公告)号：EP1091218A2
公开(公告)日：2001-04-11
申请号：EP00303675.3
申请日：2000-05-02
CPC分类号： G01R31/083 , G01R31/021
摘要： A constant current termination is provided for cable locating tones on communication and control cables that may be buried or placed in underground duct structures. The constant current termination limits the current on each branch of the cable to that required for cable location, thus ensuring that branches furthest from the tone source have adequate current for location purposes. The termination is the same for each branch, regardless of its position along the cable system. This eliminates the need to calibrate and recalibrate termination distances for a cable on installation and when branches are added. It also allows the location of damaged cables where the tone signal strength on a damaged brat is less than that for which the termination was designed.
摘要翻译： 为通信和控制电缆上的电缆定位音提供恒定电流端接，可以将其埋在或放置在地下管道结构中。 恒定电流终端将电缆每个分支上的电流限制为电缆位置所需的电流，从而确保离音源最远的分支具有足够的电流用于位置目的。 无论沿着电缆系统的位置如何，每个分支的终止是相同的。 这样就不需要校准和重新校准电缆在安装时以及添加分支时的终端距离。 它还允许损坏的电缆的位置，其中损坏的母线上的音调信号强度小于终端设计的音调信号强度。
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公开(公告)号：EP0751386B1
公开(公告)日：1999-06-23
申请号：EP96202432.9
申请日：1993-04-08
CPC分类号： G01M11/083 , G01M3/047
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公开(公告)号：EP0751386A3
公开(公告)日：1997-01-08
申请号：EP96202432.9
申请日：1993-04-08
IPC分类号： G01M11/00
CPC分类号： G01M11/083 , G01M3/047
摘要： The invention provides a monitor for monitoring the condition of fibre optic communication cables. The system employs one or more of the optical fibres of a cable to monitor the cable structure for damage or kinks. By using two separate laser sources and simultaneously monitoring the optical losses at two distinct and separate wavelengths, the loss signature of the monitored fibre is determined, analyzed and related to the mechanical condition of the cable structure.
摘要翻译： 本发明提供了用于监视光纤通信电缆状态的监视器。 该系统使用一根或多根电缆的光纤来监视电缆结构是否损坏或扭结。 通过使用两个独立的激光源并同时监测两个截然不同的波长的光损耗，监测光纤的损耗特征被确定，分析并与光缆结构的机械条件相关。
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公开(公告)号：EP1091218A3
公开(公告)日：2003-04-09
申请号：EP00303675.3
申请日：2000-05-02
CPC分类号： G01R31/083 , G01R31/021
摘要： A constant current termination is provided for cable locating tones on communication and control cables that may be buried or placed in underground duct structures. The constant current termination limits the current on each branch of the cable to that required for cable location, thus ensuring that branches furthest from the tone source have adequate current for location purposes. The termination is the same for each branch, regardless of its position along the cable system. This eliminates the need to calibrate and recalibrate termination distances for a cable on installation and when branches are added. It also allows the location of damaged cables where the tone signal strength on a damaged brat is less than that for which the termination was designed.
摘要翻译： 为通信和控制电缆上的电缆定位音提供恒定电流终端，这些通信电缆和控制电缆可能埋入或放置在地下管道结构中。 恒流终端将电缆每个分支上的电流限制到电缆位置所需的电流，从而确保离音源最远的分支具有足够的电流用于定位目的。 无论沿着电缆系统的位置如何，每个分支的终端都是相同的。 这消除了在安装和添加分支时校准和重新校准电缆终端距离的需要。 它还允许受损电缆的位置，其受损小孩的音频信号强度低于终端设计的音调信号强度。
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10.发明公开Tone transmission over cable sheaths for cable location 审中-公开TonübertragungüberKabelmantel zur Lokalisierung des Kabels
公开(公告)号：EP1107023A1
公开(公告)日：2001-06-13
申请号：EP99309710.4
申请日：1999-12-02
发明人： Vokey, David E.
IPC分类号： G01V3/06
CPC分类号： G01V3/06
摘要： A transmission enhancement system is used for strengthening low frequency cable locating signals on the metallic shields of long underground cables. The system includes equalization circuits on the cable armour or shield (10) at regular intervals, for example at splice locations. The equalization circuits includes an inductor (20) that significantly reduces the rate of attenuation of the low frequency tone signal and greatly enhances the strength of the signal at distances where the signal would otherwise be very weak or unusable. The equalization circuit may be a resonant circuit having a capacitor (24) connected in parallel with the inductor. The capacitor compensates for the inductor's attenuation of high frequency tones for local location purposes. The preferred embodiments of the equalization circuit include a surge arrestor (26) coupled in parallel with the inductor and capacitor.
摘要翻译： 传输增强系统用于加强长地下电缆金属屏蔽层上的低频电缆定位信号。 该系统包括例如在接合位置处的规则间隔的电缆护套或屏蔽件（10）上的均衡电路。 均衡电路包括电感器（20），其显着降低低频音调信号的衰减速率，并且大大增强信号在信号否则将非常弱或不可用的距离处的强度。 均衡电路可以是具有与电感器并联连接的电容器（24）的谐振电路。 电容器补偿电感器对高频音调的衰减，用于本地定位。 均衡电路的优选实施例包括与电感器和电容器并联耦合的浪涌抑制器（26）。
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