CN103487727B - A high voltage cable sheath fault locating method of a power line - Google Patents

A high voltage cable sheath fault locating method of a power line Download PDF

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CN103487727B
CN103487727B CN 201310248193 CN201310248193A CN103487727B CN 103487727 B CN103487727 B CN 103487727B CN 201310248193 CN201310248193 CN 201310248193 CN 201310248193 A CN201310248193 A CN 201310248193A CN 103487727 B CN103487727 B CN 103487727B
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CN 201310248193
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CN103487727A (en )
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罗致远
詹威鹏
陈腾彪
吴彦志
周庆坚
江克宜
邬韬
魏前虎
李高峰
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深圳供电局有限公司
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Abstract

一种高压电力电缆外护套故障在线定位方法,高频方波信号从检测单元发出,通过同轴导线传输到金属电极上,然后过电容作用耦合到电缆金属护套上,因为电缆金属护套两端接地状态,所以高频脉冲信号通过电缆金属护套和大地形成一个回路,套在交叉互联线上的高频电流传感器,作为耦合高频脉冲信号的传感设备,耦合到高频脉冲信号,然后通过高频同轴电缆线传输到检测单元中进行采集分析,分析后的数据通过无线传输线,传送到后台服务器中,进行存储、显示。 A high voltage power cable outer jacket line fault location method, high-frequency square wave signal emitted from the detection unit, transmitted to the coaxial cable through the metal electrode, and then coupled to a capacitive effect through the cable sheath, because the cable metal sheath ends grounded state, a high-frequency pulse signal forming circuit and the ground via a cable metal sheath, sleeve in cross-connects the line frequency current sensor, a sensing device coupled to a high-frequency pulse signal, is coupled to the high frequency pulse signal and then transferred to the detection unit for acquisition and analysis by high-frequency coaxial cable, wireless data transmission line analysis, sent to the back-end server, storage, display. <pb pnum="1" /> <Pb pnum = "1" />

Description

一种高压电力电缆外护套故障在线定位方法 A high voltage cable sheath fault locating method of a power line

技术领域 FIELD

[0001] 本发明属于电力设备的在线监测技术领域,具体涉及一种高压电力电缆外护套故障在线定位方法。 [0001] Online Monitoring Technical Field The present invention belongs to the electrical equipment, and particularly relates to a high voltage power cable sheath outer line fault location method.

背景技术 Background technique

[0002] IIOkV及以上电压等级电力电缆一般为单芯设计,为了消除电缆金属护套上的感应电压过高而带来的感应电流过大,导致电缆外护套发热严重的现象。 [0002] IIOkV above voltage level of single-core power cables and general design, in order to eliminate the induced voltage on the cable metal sheath brought high induction current is too large, resulting in an outer cable jacket heating serious phenomenon. 在长距离传输时,一般采用三相电缆金属护套交叉互联换位方式实施,利用三相的相位相差120°来抵消或者减小护套上感应电压,避免外护套绝缘击穿,减小接地环流值。 At long distances, typically use phase cable metal sheath Cross Connection transposition embodiment mode, the phase difference of three-phase 120 ° to offset or reduce the induced voltage on the sheath, the outer sheath to avoid insulation breakdown, is reduced ground loops value. 电缆外护套是电力电缆最外层保护,是电缆的第一层的保护,也是最容易受外力破坏的位置,所以对电力电缆外护套的故障监测是非常重要的,特别是对于直埋式电缆。 An outer cable sheath is the outermost protective power cable, the cable is protected by the first layer, is most easily affected by external damage location, the monitoring of power failure the outer cable jacket is very important, especially for buried cable. 由于各种原因外护套遭破损后形成直接接地点,造成电缆的多点接地故障,从而导致金属护套的电流增加,电缆发热直接导致电缆负荷降低,也会导致主绝缘的老化,严重时可导致电缆击穿,本发明是为了及时发现此类故障并且对故障进行定位的一种方法。 Since the outer sheath were various reasons direct earthing point formed after damage, resulting in multi-point grounding cable fault, causing a current to the metal sheath increases, resulting in a direct cable heating cable loading decreases, the main insulation can also lead to aging, serious the cable can cause a breakdown, the present invention is to detect such a failure and a method for locating a fault.

[0003] 检索发现,对于电力电缆外护套故障在线监测及定位方法比较少,而对于电力电缆的主绝缘的监测和故障定位比较多,在《供用电》杂志中,第29卷第2期的《高压单芯电缆外护套故障查测及修补方法》中对单芯电力电缆外护套故障给出了一些测试方法,其中也列举了几种现场故障定位方法,如电桥平衡法,当三相都有故障时恒流源烧穿法和脉冲定位法,这些都是已经成熟的应用到现场的方法。 [0003] The search identified, the outer cable sheath power line monitoring and fault location method is relatively small, and the main power cable insulation monitoring and fault location more, the "power supply" magazine, Vol. 29, No. 2 "Single-core high-voltage cable outer sheath fault investigation and measurement method for repairing" of the outer sheath of the single-core power cable fault gives some test methods, which also include several field fault location method, such as bridge balance method when the three-phase faults both burn through and pulsed current source localization method, these are mature field applied to the method. 但是这些方法都是离线测试,并不适合在线测试,查找其他文献中提到方法,火花实验法,跨步电压法虽然是带电测试一种方法,但是毕竟是一种带电测试仪器,需要人员来操作。 However, these methods are tested offline, is not suitable for online testing and look for other methods mentioned in the literature, sparks experiment, although the step voltage method is a way to test live, but after all, is a live test equipment, personnel need to operating.

发明内容 SUMMARY

[0004] 为了克服上述现有技术的缺陷,本发明的目的在于提供一种高压电力电缆外护套故障在线定位方法,解决了直埋式单芯电缆外护套破损导致接地故障情况下进行在线定位的难题,无需复杂的现场人工操作,只需要远程控制定位系统,就可以利用软件算法定位出护套破损的位置。 [0004] In order to overcome the drawbacks of the prior art, an object of the present invention is to provide an external high voltage power line cable sheath fault location method, to solve the single conductor cable outer jacket Buried cause breakage of the case where a ground fault line positioning problem, without complex field manual operation, only the remote control positioning system, you can use software algorithms locate the jacket worn position.

[0005] 为了达到上述目的,本发明的技术方案为: [0005] To achieve the above object, the technical solution of the present invention is:

[0006] 一种高压电力电缆外护套故障在线定位方法,包括以下步骤: [0006] A high voltage power line cable sheath fault location method, comprising the steps of:

[0007] 步骤一、将一个完整的交叉互联段电路分成三段,每段长度在500米,每段都有A, B,C三相组成,其线芯1都是相连的,每两端段接头处电缆护套2是断开的,并在接头处通过交叉互联线7进行不同相位的交叉互联,交叉互联线7上套接有高频电流传感器5,交叉互联方式为:第一段A相金属护套层连接到B相第二段金属护套层,第一段B相金属护套层连接到C相第二段金属护套层,第一段C相金属护套层连接到A相第二段金属护套层,在第二组接头处,再进行交叉互联,最终,三段电缆通过两端的直接接地线8实现两端直接接地,粘贴在电缆护套2表层的金属电极4通过同轴导线3与检测单元9相连,高频电流传感器5通过同轴电缆线6与检测单元9相连;检测单元9与后台服务器10之间无线传输; [0007] Step a, to a full cross-section of the interconnection circuit is divided into three segments, each segment 500 meters in length, each have A, B, C composed of three phases, which are connected to the core 1, both ends of each of segment joints cable jacket 2 is turned off, and interconnected at a joint cross through different phases of cross-connects the line 7, line 7 cross connection sleeved high-frequency current sensor 5, cross connection way: the first A metal sheath is connected to the phase B phase metal sheath second segment, the first segment B phase C is connected to the metal sheath metal sheath with the second segment, the first segment C is connected to the metal sheath phase a metal sheath with the second segment, the second joint set, and then cross-connects, finally, three sections of the cable at both ends to achieve directly earthed at both ends by direct ground line 8, the metal electrode 2 attached to the surface of the cable sheath 4 is connected via coaxial cable 3 and the detection unit 9, a high-frequency current sensor 5 is connected via coaxial cable 6 and the detection unit 9; 9 wireless transmissions between the server and the background detection unit 10;

[0008] 步骤二、高频方波信号从检测单元9发出,通过同轴导线3传输到金属电极4上, 通过电容作用耦合电缆金属护套2上,信号变成高频脉冲型信号,因为屏蔽层两端都是接地状态,所以信号会沿电缆往两端传输,信号幅值与电极两边的等效阻抗成反比,此时高频脉冲电流传感器5上耦合到脉冲信号,此时信号为原波信号,当电缆金属护套2有破损故障时,因为电缆为直埋式电缆,会造成电缆金属护套2和土壤有接触,造成微接地,可以等效看成屏蔽层和大地连接的电阻,电阻的大小体现出接地故障的严重程度,此处为不匹配点, 所以高频信号在此处会产生分流,并有部分能量反射,当高频脉冲幅值足够大时,其反射波会通过交叉互联传输到另外一个接地处,此时在高频电流传感器5上耦合出反射波信号, 高频脉冲在接地故障点,产生反射波和电路分流 [0008] Step two, the high frequency square wave signal emitted from the detection unit 9, a transmission 3 through the coaxial cable to the metal electrodes 4, by the capacitive coupling effect of the cable metal sheath 2, a pulse-type signal into a high frequency signal, because both ends of the shield are grounded state, the signal will be transmitted along the cable to the two ends, the signal amplitude is inversely proportional to the equivalent impedance of the electrodes on both sides, this time the pulse signal is coupled to a pulse current sensor 5 at this time is the signal original wave signal, when the cable metal sheath 2 is damaged fault, because the cable is buried cable will cause the cable metal sheath and soil contact 2, resulting in micro-ground, can be seen as the equivalent of the shield layer and the ground connection resistance, the magnitude of the resistance reflects the severity of the ground fault point mismatch here, so the high-frequency signal shunting generated here, and some energy is reflected, when the high frequency pulse amplitude is sufficiently large, the reflected wave in addition to the ground will be a cross-transmission through the network, this time coupling the reflected wave signal in the high-frequency current sensor 5, a ground fault point of the high-frequency pulse, and a reflected wave occurs shunt circuit ,原波和反射波都会通过高频脉冲传感器5耦合到监测单元9中,在监测单元9中计算出原波和反射波的时间差,利用双脉冲时间差值来推算出故障点位置; , The original and reflected waves are coupled by a radio-frequency pulse sensor 5 to the monitoring unit 9 calculates the original and reflected waves in the time difference between the monitor unit 9, using a double pulse to calculate the time difference between the fault location;

[0009] 具体定位计算方法,假如脉冲信号在电缆的传输速度为V,原波与故障点的反射波时间差为Λ t,如下公式就可以计算出故障点到高频脉冲传感器距离X : [0009] DETAILED positioning calculation method, if the pulse signal cable transmission speed is V, the time of the original wave and the reflected wave fault point difference Λ t, the following equation can be calculated to a high frequency pulse sensor fault point distance X:

[0010] [0010]

Figure CN103487727BD00041

[0011] 在电缆导体中的波传输的速度V可以预先测试出来,再用一条已知长度的电缆, 在端部接入一个脉冲,然后在端部做接收端,测试出原波和反射波的时间差,就可以计算出波在电缆中的速度。 [0011] in the wave transmission velocity V cable conductors can be tested out in advance, and then a known length of cable, a pulse at the end of the access, then the receiving end do end, the test original and reflected waves the time difference can be calculated wave velocity in the cable.

[0012] 本发明首先往单芯电缆非直接接地端接头处的金属护套层和大地之间,接入周期性高频脉冲信号,根据电力电缆连接方式,信号会沿着电缆金属护套传播,最终和大地形成一个回路。 [0012] The present invention is firstly to between the metal sheath and the earth ground joint at the single-core cables not directly access a periodic high frequency pulse signal, the power cable is connected, the signal will propagate along the cable metal sheath final and the earth form a loop. 系统通过高频电流传感器耦合回路上的高频脉冲信号,利用信号的原波和在故障点的反射波时间差来计算出故障的位置。 A sensor system coupled back via a high-frequency current path frequency pulse signal, using the signal of the original wave and the reflection wave time difference calculated fault point location of the fault.

[0013] 本发明首先往单芯电缆非直接接地端接头处的金属护套层和大地之间,接入周期性高频脉冲信号,根据电力电缆连接方式,信号会沿着电缆金属护套传播,最终和大地形成一个回路。 [0013] The present invention is firstly to between the metal sheath and the earth ground joint at the single-core cables not directly access a periodic high frequency pulse signal, the power cable is connected, the signal will propagate along the cable metal sheath final and the earth form a loop. 系统通过高频电流传感器耦合回路上的高频脉冲信号,利用信号的原波和在故障点的反射波时间差来计算出故障的位置。 A sensor system coupled back via a high-frequency current path frequency pulse signal, using the signal of the original wave and the reflection wave time difference calculated fault point location of the fault.

附图说明 BRIEF DESCRIPTION

[0014] 图1是单芯电缆交叉互联情况下护套故障定位系统图。 [0014] FIG. 1 is a system diagram sheath fault location where the single core cable cross-connects.

[0015] 图2是A相电力电缆金属护套接地故障在线定位脉冲流示意图。 [0015] FIG. 2 is a schematic view of the A-phase pulse streams metal jacket locating a ground fault line.

[0016] 图3是电力电缆金属护套故障定位等效线路图。 [0016] FIG. 3 is a metal jacket equivalent circuit diagram fault location.

[0017] 图4是电力电缆金属护套故障定位计算方法。 [0017] FIG. 4 is a metal jacket fault location calculation method.

[0018] 图5是电力电缆金属护套故障定位系统原始数据显示界面。 [0018] FIG. 5 is a power cable metal sheath fault location system display interface of the original data.

[0019] 图6是电力电缆金属护套接地故障在线定位系统图。 [0019] FIG. 6 is metal jacket line ground fault location system of FIG.

具体实施方式 detailed description

[0020] 下面结合附图对本发明工作做详细叙述。 [0020] The following detailed description of the drawings do work in conjunction with the present invention.

[0021] -种高压电力电缆外护套故障在线定位方法,包括以下步骤: [0021] - species of high-voltage power line cable sheath fault location method, comprising the steps of:

[0022] 步骤一、参照图1,将一个完整的交叉互联段电路分成三段,每段长度在500米,每段都有A,B,C三相组成,其线芯1都是相连的,每两端段接头处电缆护套2是断开的,并在接头处通过交叉互联线7进行不同相位的交叉互联,交叉互联线7上套接有高频电流传感器5,交叉互联方式为:第一段A相金属护套层连接到B相第二段金属护套层,第一段B相金属护套层连接到C相第二段金属护套层,第一段C相金属护套层连接到A相第二段金属护套层,在第二组接头处,再进行交叉互联,最终,三段电缆通过两端的直接接地线8实现两端直接接地,粘贴在电缆护套2表层的金属电极4通过同轴导线3与检测单元9相连,高频电流传感器5通过同轴电缆线6与检测单元9相连;检测单元9与后台服务器10之间无线传输; [0022] Step a, with reference to FIG. 1, a full cross-section of the interconnection circuit is divided into three segments, each segment 500 meters in length, each have A, B, C composed of three phases, which are connected to the core 1 each end sections of the cable connector 2 is disconnected from the jacket, and cross joints interconnected by cross-connects different phase lines 7, line 7 cross connection sleeved high-frequency current sensor 5 is a cross interconnection mode : the first phase A metal sheath is connected to the second segment B phase metal sheath, with metal sheath first section B is connected to the second segment C-phase metal sheath, with metal sheath first section C a jacket is connected to the metal sheath relative to the second segment, the second joint set, and then cross-connects, finally, three sections of the cable by directly across the ground line 8 implemented directly earthed at both ends, affixed to the cable sheath 2 metal electrodes 4 are connected through the surface layer 3 and the coaxial cable detection unit 9, a high-frequency current sensor 5 is connected via coaxial cable 6 and the detection unit 9; 9 wireless transmissions between the server and the background detection unit 10;

[0023] 步骤二、参照图2,高频方波信号从检测单元9发出,通过同轴导线3传输到金属电极4上,通过电容作用耦合电缆金属护套2上,信号变成高频脉冲型信号,因为屏蔽层两端都是接地状态,所以信号会沿电缆往两端传输,信号幅值与电极两边的等效阻抗成反比, 此时高频脉冲电流传感器5上耦合到脉冲信号,此时信号为原波信号,当电缆金属护套2有破损故障时,因为电缆为直埋式电缆,会造成电缆金属护套2和土壤有接触,造成微接地, 可以等效看成屏蔽层和大地连接的电阻,电阻的大小体现出接地故障的严重程度,此处为不匹配点,所以高频信号在此处会产生分流,并有部分能量反射,当高频脉冲幅足够值够大时,其反射波会通过交叉互联传输到另外一个接地处,此时在高频电流传感器5上耦合出反射波信号,具体定位算法就是应用脉冲的时间差来 [0023] Step two, referring to FIG. 2, the high-frequency square wave signal emitted from the detection unit 9, a transmission 3 through the coaxial cable to the metal electrodes 4, by the capacitive coupling effect of the metal cable sheath 2, the high-frequency pulse signal becomes type signal, since both ends of the shield are grounded state, the signal will be transmitted along the cable to the two ends, the electrode signal amplitude is inversely proportional to the equivalent impedance on both sides, this time the pulse signal is coupled to the high-frequency pulse current sensor 5, At this time, the original signal is a wave signal, when the cable metal sheath 2 is damaged fault, because the cable is buried cable will cause the cable metal sheath and soil contact 2, resulting in micro-ground, the shield layer can be regarded as the equivalent and a resistor connected to earth, the magnitude of the resistance reflect the severity of the ground fault point mismatch here, so the high-frequency signal shunting generated here, and some energy is reflected, when the high frequency pulse width value is sufficiently large enough , the reflected wave will be transmitted through the cross-connects to another ground, the reflected wave signal is coupled out at this time in the high-frequency current sensor 5, the specific location algorithm is the pulse application time difference 实现,具体实现方式如下图3所示:高频脉冲在接地故障点,产生反射波和电路分流波,原波和反射波都会通过高频脉冲传感器5 耦合到监测单元9中,在监测单元9中计算出原波和反射波的时间差,利用双脉冲时间差值来推算出故障点位置。 Achieve the specific implementation shown in Figure 3 as follows: the ground fault point radio-frequency pulse generating circuit shunt wave and reflected wave, the original and reflected waves are coupled into the monitor unit 9 through high-frequency pulse sensor 5, the monitoring unit 9 calculated original and reflected waves of the time difference, the time difference between the use of the double pulse to calculate the fault location.

[0024] 具体定位计算方法,如图4所示,假如脉冲信号在电缆的传输速度为V,原波与故障点的反射波时间差为Λ t,如下公式就可以计算出故障点到高频脉冲传感器距离X : [0024] DETAILED positioning calculation method, shown in Figure 4, the pulse signal if the transmission speed of the cable is V, the time of the original wave and the reflected wave fault point difference Λ t, the following equation can be calculated to a high frequency pulse fault point sensor distance X:

[0025] [0025]

Figure CN103487727BD00051

[0026] 由于在电缆导体中的波传输的速度V可以预先测试出来,测试方式比较简单,用一条已知长度的电缆,在端部接入一个脉冲,然后在端部做接收端,测试出原波和反射波的时间差,就可以计算出波在电缆中的速度。 [0026] Since the transmission speed of the wave in the cable conductor V out may be pre-test, the test is relatively simple manner, with a known length of cable, a pulse at the end of the access, then the receiving end do end, the test the time difference between the original and reflected waves, the wave velocity can be calculated in the cable.

[0027] 需要说明两点:首先接入信号电极4两端电缆的定位方式相同,就会造成确定了距离,但是不确定是那个段电缆造成的反射波,关于故障点在那一段判定,比较简单,只需要测试相邻两段的交叉互联线上电流值和直接接地电流值即可;其次在线路的不连续处都可能发生反射,包括交叉互联段连接处和两端接地处部分,在此处的反射都是固定已知的反射,在对电缆做第一次测试时,就发现这种反射,并作记录,在长期在线运行时,如果发现有新的反射点,应该是电缆外护套故障造成的。 [0027] Note two things: First, access to the same manner as the signal electrode 4 positioned at both ends of the cable, will cause the determined distance, it is uncertain that the reflected wave caused by the cable segments, on the point of failure is determined in that period, the comparison simple, only two interconnect lines intersecting ground current value and the current value directly to adjacent test requires; second reflection may occur at the discontinuity line, interconnecting segments comprising a cross-connections and grounded at both end portions, in here are fixed reflection reflection known, at the time of the cable to do the first test, we found that this reflection, and for the record, in the long run when online, if you find a new reflection point, it should be outside the cable sheath failure.

[0028] 高频方波信号从检测单元9发出,通过同轴导线3传输到金属电极4上,然后过电容作用耦合到电缆金属护套2上,因为电缆金属护套两端接地状态,所以高频脉冲信号通过电缆金属护套2和大地形成一个回路,套在交叉互联线7上的高频电流传感器5,作为耦合高频脉冲信号的传感设备,耦合到高频脉冲信号,然后通过高频同轴电缆线6传输到检测单元9中进行采集分析,分析后的数据通过无线传输线,传送到后台服务器10中,进行存储、显示。 [0028] The high frequency square wave signal emitted from the detection unit 9, a transmission 3 through the coaxial cable to the metal electrode 4, and then coupled to a capacitive effect through the metallic cable sheath 2 because both ends of the ground state of the cable sheath, so frequency pulse signal through the cable metal sheath and the earth forms a loop 2, set in the high-frequency lines 7 cross-connects current sensor 5, a sensing device coupled to a high-frequency pulse signal, is coupled to the high frequency pulse signal, then high-frequency coaxial transmission line 9 to the detection unit 6 acquisition and analysis is performed, the data analysis through the wireless transmission line 10 is transmitted to the back-end server, storage, display.

[0029] 实验室验证: [0029] Lab Validation:

[0030] 本发明的试验室验证,在实验室用三根500米50-3型号同轴电缆线模拟电力电缆,组建成图2的结构,在第一段与第二段交汇处把电极贴在电缆的表面,用普通导线连接两端之间的屏蔽层,每段的线芯部分空接,把高频电流传感器卡在第一段和第二段的连接线上,两端在不同地方接入大地。 [0030] The test chamber of the invention is verified in a laboratory with three 500 meters 50-3 simulation models the coaxial cable power cables, to the formation of the structure of FIG. 2, at the junction of the first section and second segment electrodes to the surface of the cable, the shield layer between the common wire connecting the two ends, each connected to the air core part, a high frequency current is connected to the sensor card in the first and second sections of the line, connect both ends at different places into the earth. 连接好定位系统的检测单元和后台数据服务器部分,先将方波信号输入到电极上,同时采集高频电流传感器的信号,本系统采样率为lOOMS/s,可采集完整的脉冲波形,包括原波和反射波波形,采集显示如图5所示,整个连续采样长度为20ms,采样的原始数据进行显示,原波和反射波都可以在时域显示区内进行显示。 Connect the detection unit and the positioning system portion of the background data server, the square wave signal is input to the first electrode, while the high-frequency current sensor signal acquisition, the system sampling rate lOOMS / s, the pulse waveform can be collected complete, including the original wave and the reflected waveform, acquisition and display shown in Figure 5, the entire length of the continuous sampling of 20ms, the raw data samples for display, the original and reflected waves can be displayed within the display area in the time domain. 试验时在第二段的315米处对地连接一个IK Ω电阻,模拟接地故障,运行系统进行采集和分析后,波形如图6所示,设定波速为v=169m/us由试验计算出,软件可测出原波和反射波时间Λ t=3. 72us由此可计算故障点距离传感器位置为315. 485米,与预设的缺陷相吻合,表明系统在试验内精度较为准确,由于在线运行电力电缆环境比较复杂,所以系统必须添加一些抗干扰的手段,包括:硬件滤波、软件滤波和小波滤波等手段,滤除现场检测各种干扰因素。 315 meters after the second section is connected to the test a IK Ω resistor to ground, analog ground fault, acquisition and analysis system operation, the waveform shown in Figure 6, is set a velocity of v = 169m / us calculated from the test , original software can be measured and reflected waves time Λ t = 3. 72us thereby calculate the distance sensor fault point location 315.485 m, coincides with a preset defect, in the test system indicates that the accuracy is more accurate, since the online operation of the power cable environment is more complex, so the system must add some anti-jamming means, including: hardware filtering, filtering and wavelet filtering software and other means to filter out interference field testing a variety of factors.

Claims (2)

  1. 1. 一种高压电力电缆外护套故障在线定位方法,其特征在于,包括w下步骤: 步骤一、将一个完整的交叉互联段电路分成=段,每段长度在500米,每段都由A,B,C =相组成,其线忍(1)都是相连的,每两端段接头处电缆金属护套(2)是断开的,并在接头处通过交叉互联线(7)进行不同相位的交叉互联,交叉互联线(7)上套接有高频脉冲电流传感器(5),交叉互联方式为:第一段A相金属护套层连接到B相第二段金属护套层,第一段B相金属护套层连接到C相第二段金属护套层,第一段C相金属护套层连接到A相第二段金属护套层,在第二组接头处,再进行交叉互联,最终,立段电缆通过两端的直接接地线(8) 实现两端直接接地,粘贴在电缆金属护套(2)表层的金属电极(4)通过同轴导线(3)与检测单元(9)相连,高频脉冲电流传感器(5)通过同轴电缆线(6)与检测单 1. A high voltage cable sheath fault locating method of a power line, characterized by comprising the w steps: Step 1, a complete circuit is divided into sections interconnected = cross section, each 500 meters in length, each being formed a, B, C = phase which tolerance lines (1) are connected, each of the end sections of the cable connector metal sheath (2) is open, and cross-connects through line (7) at the joints cross connection different phases, cross-connects the line (7) is mounted a pulse current sensor (5), cross-connects way: the first phase a metal sheath is connected to the second segment B phase metal sheath the first section B is connected to the metal sheath with the C-phase metal sheath second segment, the first segment C is connected to phase A metal sheath metal sheath with the second segment, the second set of joints, cross Connection then, ultimately, to achieve vertical cable segment directly earthed at both ends by direct ground connection (8) at both ends, attached to the metal jacket (2) of the surface layer of the metal electrode (4) by a coaxial cable (3) and the detection means (9) is connected to a high-frequency pulse current sensor (5) through a coaxial cable (6) and the detection unit (9)相连;检测单元(9)与后台服务器(10)之间无线传输; 步骤二、高频方波信号从检测单元(9)发出,通过同轴导线(3)传输到金属电极(4)上, 通过电容作用禪合电缆金属护套(2)上,信号变成高频脉冲型信号,因为屏蔽层两端都是接地状态,所W信号会沿电缆往两端传输,信号幅值与电极两边的等效阻抗成反比,此时高频脉冲电流传感器(5)上禪合到脉冲信号,此时信号为原波信号,当电缆金属护套(2)有破损故障时,因为电缆为直埋式电缆,会造成电缆金属护套(2)和±壤有接触,造成微接地,等效看成屏蔽层和大地连接的电阻,电阻的大小体现出接地故障的严重程度,此处为不匹配点, 所W高频信号在此处会产生分流,并有部分能量反射,当高频脉冲幅值足够大时,其反射波会通过交叉互联传输到另外一个接地处,此时在高频脉冲电流传感器 (9) is connected; wireless transmissions between the detecting unit (9) with a backend server (10); two step, high-frequency square wave signal sent from the detecting unit (9), transmitted through the coaxial cable (3) to the metal electrode (4 a), by the capacitive effect Zen bonded metal jacket (2), a pulse-type signal into a high frequency signal, because both ends of the shield are grounded state, the W signal will be transmitted along the cable to the two ends, the amplitude of the signal both sides of the equivalent impedance is inversely proportional to the electrode, then the pulse current sensor (5) is bonded to Zen pulse signal, the original signal is a wave signal at this time, when the cable metal sheath (2) is damaged failure because the cable is a buried cable will cause the cable metal sheath (2) and ± soil contact, causing micro-ground, the equivalent size as the shield layer and the ground connection resistance, which reflect the severity of a ground fault, where point of mismatch, W high-frequency signal generated here split, and some energy is reflected, when the high frequency pulse amplitude is sufficiently large, the reflected wave will be transmitted through the cross-connects to ground at another, in this case pulse current sensors 5)上禪合出反射波信号,高频脉冲在接地故障点,产生反射波和电路分流波,原波和反射波都会通过高频脉冲电流传感器(5)禪合到检测单元(9)中,在检测单元(9)中计算出原波和反射波的时间差, 利用双脉冲时间差值来推算出故障点位置。 5) closing the Zen reflected wave signal, a high frequency ground fault point pulse generating circuit shunt wave and reflected wave, the original and reflected waves are (5) laminated to Zen detection unit (9) by a pulse current sensor calculate the original and reflected waves of the detection unit (9) in the time difference, the time difference between the use of the double pulse to calculate the fault location.
  2. 2. 根据权利要求1所述的一种高压电力电缆外护套故障在线定位方法,其特征在于, 利用双脉冲时间差值来推算出故障点位置,具体定位计算方法如下:脉冲信号在电缆的传输速度为V,原波与故障点的反射波时间差为At,按W下公式计算出故障点到高频脉冲传感器距离X : The high-pressure one of said power line cable sheath fault location method as claimed in claim, characterized in that the double pulse using the time difference to calculate the fault location, specific targeting calculated as follows: pulse signal cable transmission speed is V, the time of the original wave and the reflected wave fault point difference at, calculated according to the formula W-frequency pulses to the fault point sensor distance X:
    Figure CN103487727BC00021
    用一条已知长度的电缆,在端部接入一个脉冲,然后将该端部作为接收端,测试出原波和反射波的时间差,计算出脉冲信号在电缆的传输速度为V。 With a known length of cable, a pulse at the end of the access portion and the end portion as a receiver to test the original and reflected waves of the time difference, calculates the transmission speed pulse signal cable is V.
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