[go: up one dir, main page]

CN103364699B - Cable discharge failure detector - Google Patents

Cable discharge failure detector Download PDF

Info

Publication number
CN103364699B
CN103364699B CN201310313615.5A CN201310313615A CN103364699B CN 103364699 B CN103364699 B CN 103364699B CN 201310313615 A CN201310313615 A CN 201310313615A CN 103364699 B CN103364699 B CN 103364699B
Authority
CN
China
Prior art keywords
cable
voltage
power
capacitor
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201310313615.5A
Other languages
Chinese (zh)
Other versions
CN103364699A (en
Inventor
马国明
李成榕
江军
罗定平
李庆民
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North China Electric Power University
Original Assignee
North China Electric Power University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North China Electric Power University filed Critical North China Electric Power University
Priority to CN201310313615.5A priority Critical patent/CN103364699B/en
Publication of CN103364699A publication Critical patent/CN103364699A/en
Application granted granted Critical
Publication of CN103364699B publication Critical patent/CN103364699B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Testing Relating To Insulation (AREA)

Abstract

本发明公开了一种电缆放电故障检测装置。该电缆放电故障检测装置包括:直流电源,与断电电缆相连接,用于对断电电缆充电;电感,与直流电源相连接,并且与断电电缆相连接;开关,与电感和断电电缆形成LCR振荡回路,其中,在开关断开时,断电电缆充电,在开关闭合时,断电电缆放电;以及检测单元,与LCR振荡回路相连接,用于检测LCR振荡回路的脉冲波形。通过本发明,利于现场巡检电缆是否发生放电故障。

The invention discloses a cable discharge fault detection device. The cable discharge fault detection device includes: a DC power supply connected to the power-off cable for charging the power-off cable; an inductor connected to the DC power supply and connected to the power-off cable; a switch connected to the inductance and the power-off cable An LCR oscillating circuit is formed, wherein when the switch is turned off, the power-off cable is charged, and when the switch is closed, the power-off cable is discharged; and a detection unit is connected with the LCR oscillating circuit for detecting the pulse waveform of the LCR oscillating circuit. Through the invention, it is beneficial to on-site inspection whether discharge fault occurs in the cable.

Description

电缆放电故障检测装置Cable discharge fault detection device

技术领域technical field

本发明涉及电力检测领域,具体而言,涉及一种电缆放电故障检测装置。The invention relates to the field of electric power detection, in particular to a cable discharge fault detection device.

背景技术Background technique

随着社会对电力需求的不断增大,电力产业得到快速发展,大型输电网络的安全运行成为电力行业关注的重大问题。随着我国城市电网的不断改造,电缆作为电力电缆己经广泛应用于输电线路和配电网中,因此,对电缆的绝缘状态检测显得十分必要而且重要。With the society's increasing demand for electricity and the rapid development of the power industry, the safe operation of large-scale transmission networks has become a major concern of the power industry. With the continuous transformation of my country's urban power grids, cables have been widely used in transmission lines and distribution networks as power cables. Therefore, it is very necessary and important to detect the insulation status of cables.

为了检测电缆的绝缘状态,提高输电网络的安全性,在现有技术中提供了一种方案,在该方案中,采取给被测电缆提供交流电源以检测该被测电缆是否发生放电的方式来检测电缆的状态。这种技术方案所提供的交流电源带有笨重的变压器,因此不利于现场巡检。In order to detect the insulation state of the cable and improve the safety of the power transmission network, a solution is provided in the prior art. In this solution, AC power is provided to the cable under test to detect whether the cable under test is discharged. Check the status of the cable. The AC power provided by this technical solution has a bulky transformer, which is not conducive to on-site inspection.

针对相关技术中现场巡检电缆是否发生放电故障时不利于现场巡检的问题,目前尚未提出有效的解决方案。Aiming at the problem in the related art that when the on-site inspection cable has a discharge fault, it is not conducive to the on-site inspection, and no effective solution has been proposed so far.

发明内容Contents of the invention

本发明的主要目的在于提供一种电缆放电故障检测装置,以解决相关技术中现场巡检电缆是否发生放电故障时不利于现场巡检的问题。The main purpose of the present invention is to provide a cable discharge fault detection device to solve the problem in the related art that it is not conducive to on-site inspection when inspecting whether the cable has a discharge fault.

为了实现上述目的,根据本发明的一方面,提供了一种电缆放电故障检测装置。该电缆放电故障检测装置包括:直流电源,与断电电缆相连接,用于对断电电缆充电;电感,与直流电源相连接,并且与断电电缆相连接;开关,与电感和断电电缆形成LCR振荡回路,其中,在开关断开时,断电电缆充电,在开关闭合时,断电电缆放电;以及检测单元,与LCR振荡回路相连接,用于检测LCR振荡回路的脉冲波形。In order to achieve the above object, according to one aspect of the present invention, a cable discharge fault detection device is provided. The cable discharge fault detection device includes: a DC power supply connected to the power-off cable for charging the power-off cable; an inductor connected to the DC power supply and connected to the power-off cable; a switch connected to the inductance and the power-off cable An LCR oscillating circuit is formed, wherein when the switch is turned off, the power-off cable is charged, and when the switch is closed, the power-off cable is discharged; and a detection unit is connected with the LCR oscillating circuit for detecting the pulse waveform of the LCR oscillating circuit.

进一步地,电缆放电故障检测装置还包括:电容,电容与断电电缆相连接,用于调节LCR振荡回路的振荡频率以使LCR振荡回路的振荡频率接近工频。Further, the cable discharge fault detection device further includes: a capacitor connected to the power-off cable for adjusting the oscillation frequency of the LCR oscillating circuit so that the oscillating frequency of the LCR oscillating circuit is close to the power frequency.

进一步地,电容与断电电缆相并联。Further, a capacitor is connected in parallel with the power-off cable.

进一步地,开关为高压固体开关。Further, the switch is a high-voltage solid switch.

进一步地,直流电源、电感、开关和断电电缆设置在高压回路中,检测单元设置在低压回路中,电缆放电故障检测装置还包括:分压器,连接在高压回路和低压回路之间。Further, the DC power supply, inductor, switch and power-off cable are arranged in the high-voltage circuit, the detection unit is arranged in the low-voltage circuit, and the cable discharge fault detection device further includes: a voltage divider connected between the high-voltage circuit and the low-voltage circuit.

进一步地,分压器包括:分压器高压臂,分压器高压臂的第一端连接至高压回路;以及分压器低压臂,分压器低压臂的第一端连接至分压器高压臂的第二端。Further, the voltage divider includes: a high voltage arm of the voltage divider, the first end of the high voltage arm of the voltage divider is connected to the high voltage circuit; and a low voltage arm of the voltage divider, the first end of the low voltage arm of the voltage divider is connected to the high voltage of the voltage divider the second end of the arm.

进一步地,检测单元包括:耦合电容,耦合电容的第一端连接至高压回路;检测阻抗,检测阻抗的第一端连接至耦合电容的第二端;以及采集单元,采集单元的第一输入端连接至分压器低压臂的第一端和分压器高压臂的第二端之间,采集单元的第二输入端连接至耦合电容和检测阻抗之间。Further, the detection unit includes: a coupling capacitor, the first end of the coupling capacitor is connected to the high-voltage circuit; a detection impedance, the first end of the detection impedance is connected to the second end of the coupling capacitor; and an acquisition unit, the first input end of the acquisition unit It is connected between the first end of the low-voltage arm of the voltage divider and the second end of the high-voltage arm of the voltage divider, and the second input end of the acquisition unit is connected between the coupling capacitor and the detection impedance.

进一步地,电缆放电故障检测装置还包括:PC机,PC机的第一端与采集单元相连接,用于显示和分析采集单元采集到的结果,判断断电电缆的放电类型和放电位置;以及控制单元,控制单元的输入端与PC机第二端相连接,控制单元的第一输出端与直流电源相连接,用于控制直流电源的电压,控制单元的第二输出端与开关相连接,用于根据采集单元采集到的结果控制开关,其中,在采集单元未采集到电压波形时,控制开关断开。Further, the cable discharge fault detection device also includes: a PC, the first end of which is connected to the acquisition unit for displaying and analyzing the results collected by the acquisition unit, and judging the discharge type and discharge position of the power-off cable; and A control unit, the input end of the control unit is connected to the second end of the PC, the first output end of the control unit is connected to the DC power supply for controlling the voltage of the DC power supply, the second output end of the control unit is connected to the switch, It is used to control the switch according to the result collected by the collection unit, wherein, when the collection unit does not collect the voltage waveform, the control switch is turned off.

进一步地,电缆放电故障检测装置还包括:屏蔽单元,屏蔽单元包括:外壳;滤波器,滤波器与开关电源的输出端相连接,开关电源连接至控制单元的输出端和采集单元的输入端;以及屏蔽线缆,屏蔽线缆为控制单元的输出端的电缆和采集单元的输入端电缆。Further, the cable discharge fault detection device also includes: a shielding unit, the shielding unit includes: a housing; a filter, the filter is connected to the output end of the switching power supply, and the switching power supply is connected to the output end of the control unit and the input end of the acquisition unit; and a shielded cable, the shielded cable is an output cable of the control unit and an input cable of the acquisition unit.

通过本发明,采用直流电源,与断电电缆相连接,断电电缆在实际使用中可以等效成电容,直流电源用于对断电电缆充电;电感,与直流电源相连接,并且与断电电缆相连接;开关,与电感和断电电缆形成LCR振荡回路;以及检测单元,与LCR振荡回路相连接,用于检测LCR振荡回路的脉冲波形,解决了相关技术中现场巡检电缆是否发生放电故障时不利于现场巡检的问题,进而达到了利于现场巡检电缆是否发生放电故障的效果。Through the present invention, a DC power supply is used to connect with the power-off cable, which can be equivalent to a capacitor in actual use, and the DC power is used to charge the power-off cable; the inductance is connected to the DC power supply, and is connected to the power-off cable The cables are connected; the switch forms an LCR oscillating loop with the inductance and the power-off cable; and the detection unit is connected with the LCR oscillating loop to detect the pulse waveform of the LCR oscillating loop, which solves the problem of whether the on-site inspection cable is discharged in the related technology When a fault occurs, it is not conducive to the on-site inspection, and then achieves the effect of facilitating the on-site inspection of whether the cable has a discharge fault.

附图说明Description of drawings

构成本申请的一部分的附图用来提供对本发明的进一步理解,本发明的示意性实施例及其说明用于解释本发明,并不构成对本发明的不当限定。在附图中:The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

图1是根据本发明优选实施例的用振荡波检测电缆是否发生局部放电的电路图;以及Fig. 1 is the circuit diagram according to the preferred embodiment of the present invention whether partial discharge takes place in detecting cable with oscillating wave; And

图2是根据本发明实施例的屏蔽单元设置在采集单元的示意图。Fig. 2 is a schematic diagram of a shielding unit disposed in an acquisition unit according to an embodiment of the present invention.

具体实施方式detailed description

需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本发明。It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

根据本发明的实施例,提供了一种电缆放电故障检测装置,该装置用于对断电电缆的局部放电情况进行检测,该电缆放电故障检测装置包括直流电源、电感、开关和检测单元。According to an embodiment of the present invention, a cable discharge fault detection device is provided. The device is used for detecting partial discharge of a power-off cable. The cable discharge fault detection device includes a DC power supply, an inductor, a switch and a detection unit.

需要说明的是,在本发明的实施例中,对传输35kV及以下的电缆传输线路的检测,尤其是局部电缆的检测,都可以应用本发明的电缆放电故障检测装置。应用本发明的电缆放电故障检测装置对高压交联聚乙烯(XLPE)电缆进行放电故障检测检测尤为奏效。对电缆传输线路进行放电故障检测时,电缆传输线路处在离线状态,即电缆传输线路处在断电状态,因此,断电电缆是指处于离线状态的被测电缆,而直流电源与断电电缆相连接,用于对断电电缆充电,即用于对被测电缆充电。It should be noted that, in the embodiment of the present invention, the cable discharge fault detection device of the present invention can be applied to the detection of cable transmission lines with transmission of 35kV and below, especially the detection of local cables. It is particularly effective to use the cable discharge fault detection device of the invention to detect discharge faults of high-voltage cross-linked polyethylene (XLPE) cables. When the discharge fault detection is performed on the cable transmission line, the cable transmission line is offline, that is, the cable transmission line is in a power-off state. Therefore, the power-off cable refers to the cable under test in the offline state, and the DC power supply and the power-off cable It is used to charge the disconnected cable, that is, to charge the cable under test.

在本发明的实施例中,被测电缆在实际运行中可以等效成一个电容,因此,直流电源、电感以及被测电缆三者相连接可以形成一个充电回路,电感、开关以及被测电缆三者相连接可以形成一个LCR振荡回路。当开关断开时,在充电回路中,直流电源可以对被测电缆进行直流充电。In the embodiment of the present invention, the cable under test can be equivalent to a capacitor in actual operation. Therefore, the connection of the DC power supply, the inductor and the cable under test can form a charging circuit. Or connected to form an LCR oscillation circuit. When the switch is off, in the charging circuit, the DC power supply can charge the cable under test with DC.

电感,与所述直流电源相连接,并且与断电电缆相连接。直流电源、电感以及被测电缆三者相连接可以形成一个充电回路,电感、开关以及被测电缆三者相连接可以形成一个LCR振荡回路。An inductor is connected to the DC power supply and is connected to a power-off cable. The connection of the DC power supply, the inductor and the cable under test can form a charging circuit, and the connection of the inductor, switch and the cable under test can form an LCR oscillation circuit.

开关,与电感和断电电缆形成LCR振荡回路,其中,在开关断开时,断电电缆充电,在开关导通时,断电电缆放电。当开关断开时,在充电回路中,直流电源可以对被测电缆进行直流充电。在完成充电的基础上,当开关导通时,LCR振荡回路可以进行阻尼振荡。LCR振荡回路进行阻尼振荡可以产生振荡电压波,振荡电压波可以在被测电缆上产生振荡波电压。通过在被测电缆上施加振荡波电压可以激发出电缆潜在缺陷处的放电信号。The switch forms an LCR oscillating loop with the inductor and the power-off cable, wherein when the switch is turned off, the power-off cable is charged, and when the switch is turned on, the power-off cable is discharged. When the switch is off, in the charging circuit, the DC power supply can charge the cable under test with DC. After charging is completed, when the switch is turned on, the LCR oscillation circuit can perform damped oscillation. The damped oscillation of the LCR oscillating circuit can generate an oscillating voltage wave, and the oscillating voltage wave can generate an oscillating wave voltage on the cable under test. The discharge signal at the potential defect of the cable can be excited by applying an oscillating wave voltage on the cable under test.

检测单元,与LCR振荡回路相连接,可以用于检测LCR振荡回路的脉冲波形、LCR振荡回路是否有残压以及振荡回路的电压波形。检测单元可以同时检测LCR振荡回路的脉冲波形和电压波形。在检测单元同时检测到LCR振荡回路的脉冲波形和电压波形之后,可以完成对脉冲波形和电压波形的比对,从而确定脉冲波形发生在电压波形的具体位置,例如,可以确定脉冲波形发生在电压波形的波峰、波谷还是零点等位置。The detection unit is connected with the LCR oscillating circuit, and can be used to detect the pulse waveform of the LCR oscillating circuit, whether there is residual voltage in the LCR oscillating circuit, and the voltage waveform of the oscillating circuit. The detection unit can simultaneously detect the pulse waveform and the voltage waveform of the LCR oscillating circuit. After the detection unit simultaneously detects the pulse waveform and the voltage waveform of the LCR oscillating circuit, the comparison between the pulse waveform and the voltage waveform can be completed, so as to determine the specific position where the pulse waveform occurs in the voltage waveform. For example, it can be determined that the pulse waveform occurs at the voltage waveform The position of the peak, trough or zero point of the waveform.

例如,如果检测单元检测到LCR振荡回路有脉冲波形,则表明被测电缆有缺陷,从而判断出被测电缆存在局部放电现象。如果检测单元检测到LCR振荡回路没有脉冲波形,则表明被测电缆是完好的,从而判断出被测电缆不存在局部放电现象。如果检测单元检测到LCR振荡回路有残压,则表明高压固体开关没有导通或者导通不完全,需要先将LCR振荡回路进行彻底放电,然后再重新对充电回路进行充电。For example, if the detection unit detects that there is a pulse waveform in the LCR oscillating circuit, it indicates that the cable under test is defective, thereby judging that there is a partial discharge phenomenon in the cable under test. If the detection unit detects that there is no pulse waveform in the LCR oscillating circuit, it indicates that the cable under test is intact, thus judging that there is no partial discharge phenomenon in the cable under test. If the detection unit detects that there is residual voltage in the LCR oscillating circuit, it indicates that the high-voltage solid state switch is not turned on or is not completely turned on. It is necessary to completely discharge the LCR oscillating circuit first, and then recharge the charging circuit.

图1是根据本发明优选实施例的用振荡波检测电缆是否发生局部放电的电路图。Fig. 1 is a circuit diagram for detecting whether a partial discharge occurs in a cable by using an oscillating wave according to a preferred embodiment of the present invention.

如图1所示,在本发明的实施例中,用振荡波检测电缆是否发生局部放电的电路组成部件主要包括:被检测电缆,高压固体开关,电感,电容,直流电源,控制单元,耦合电容,检测阻抗,采集单元,分压器高压臂,分压器低压臂和PC机。As shown in Figure 1, in the embodiment of the present invention, the circuit components for detecting whether partial discharge occurs in the cable by oscillating waves mainly include: the detected cable, high-voltage solid switch, inductor, capacitor, DC power supply, control unit, and coupling capacitor , Detection impedance, acquisition unit, high-voltage arm of the voltage divider, low-voltage arm of the voltage divider and PC.

在本发明的实施例中,被测电缆在实际运行中可以等效成一个电容,因此,直流电源、电感以及被测电缆三者相连接可以形成一个充电回路,电感、开关以及被测电缆三者相连接可以形成一个LCR振荡回路。当开关断开时,在充电回路中,直流电源可以对被测电缆进行直流充电。在完成充电的基础上,当开关导通时,LCR振荡回路可以进行阻尼振荡。LCR振荡回路进行阻尼振荡可以产生振荡电压波,振荡电压波可以在被测电缆上产生振荡波电压。通过在被测电缆上施加振荡波电压可以激发出电缆潜在缺陷处的放电信号。In the embodiment of the present invention, the cable under test can be equivalent to a capacitor in actual operation. Therefore, the connection of the DC power supply, the inductor and the cable under test can form a charging circuit. Or connected to form an LCR oscillation circuit. When the switch is off, in the charging circuit, the DC power supply can charge the cable under test with DC. After charging is completed, when the switch is turned on, the LCR oscillation circuit can perform damped oscillation. The damped oscillation of the LCR oscillating circuit can generate an oscillating voltage wave, and the oscillating voltage wave can generate an oscillating wave voltage on the cable under test. The discharge signal at the potential defect of the cable can be excited by applying an oscillating wave voltage on the cable under test.

优选地,在本发明的实施例中,开关可以是高压固体开关(HVSolid-StateSwitch)。高压固体开关是指开关的绝缘物是固体的,并且开关可以用于控制高压回路的导通与断开。高压固体开关可以通过光纤连接至控制单元以采用光纤触发导通。高压固体开关接收到的导通信号为电信号。当高压固体开关接收到用于导通的电信号时,其可以先将电信号转变成光信号,光信号再通过光纤进行传播。与采用电缆触发导通的开关相比较,采用光纤触发导通的高压固体开关导通时可以避免电磁干扰的问题,也可以解决高压绝缘的问题。高压固体开关可以是由多级IGBT串联而成的,在导通状态下,它最大可以承受65kV的高压而不发生局部放电。Preferably, in the embodiment of the present invention, the switch may be a high-voltage solid-state switch (HVSolid-StateSwitch). A high-voltage solid switch means that the insulation of the switch is solid, and the switch can be used to control the on and off of the high-voltage circuit. The high-voltage solid-state switch can be connected to the control unit through optical fiber to trigger conduction with optical fiber. The conduction signal received by the high-voltage solid state switch is an electrical signal. When the high-voltage solid-state switch receives an electrical signal for conduction, it can first convert the electrical signal into an optical signal, and then the optical signal propagates through the optical fiber. Compared with the switch using cable trigger conduction, the high-voltage solid switch adopting optical fiber trigger conduction can avoid the problem of electromagnetic interference and can also solve the problem of high-voltage insulation. The high-voltage solid-state switch can be composed of multi-level IGBTs in series. In the on state, it can withstand a maximum high voltage of 65kV without partial discharge.

这样,通过在LCR振荡回路连接采用光纤触发导通的高压固体开关可以提高检测结果的准确性。采用光纤触发导通的高压固体开关的导通时间比较短,一般不超过1us。在导通状态下,采用光纤触发导通的高压固体开关导通时的等效电阻比较小,其值一般不超过10Ω。在断开状态下,采用光纤触发导通的高压固体开关断开时的等效电阻比较大,其值一般可以超过100MΩ。In this way, the accuracy of the detection result can be improved by connecting the high-voltage solid switch with optical fiber trigger conduction in the LCR oscillating circuit. The conduction time of the high-voltage solid-state switch triggered by optical fiber is relatively short, generally no more than 1us. In the conduction state, the equivalent resistance of the high-voltage solid switch that uses optical fiber to trigger conduction is relatively small, and its value generally does not exceed 10Ω. In the disconnected state, the equivalent resistance when the high-voltage solid switch is turned off using optical fiber triggering is relatively large, and its value can generally exceed 100MΩ.

优选地,电感可以是空心电感。空心电感的电感值可以为亨级别的电感值,其可以是不低于0.7H电感值。空心电感的直流电阻可以不高于20Ω。空心电感最大可以承受65kV的高压而不发生局部放电。Preferably, the inductor can be an air core inductor. The inductance value of the air-core inductor can be an inductance value of Heng level, which can be no less than 0.7H inductance value. The DC resistance of the air-core inductor can be no higher than 20Ω. Air-core inductors can withstand high voltages up to 65kV without partial discharge.

这样,空心电感的质量较小,可以减轻整个装置的质量,在对被测电缆进行现场巡检时,可以减小对电缆的损坏,从而达到有利于现场巡检电缆的放电故障的效果。In this way, the mass of the air-core inductor is small, which can reduce the mass of the entire device, and can reduce the damage to the cable when the cable is inspected on site, thereby achieving the effect of being conducive to the on-site inspection of the discharge fault of the cable.

优选地,在本发明的实施例中,可以在LCR振荡回路中接入电容,该电容可以有电极引出接头,在本发明的实施例中,其可以承受65kV的高压而不发生局部放电,其容值可以为0.1uF。电容可以用来调节LCR振荡回路的总电容。电容可以是一个或者多个。一个或者多个电容与LCR振荡回路中的被测电缆相连接,根据LCR振荡回路对总电容的要求,其连接方式可以是多样的。Preferably, in the embodiment of the present invention, a capacitor can be connected to the LCR oscillating circuit, and the capacitor can have an electrode lead connector. In the embodiment of the present invention, it can withstand a high voltage of 65kV without partial discharge, which The capacitance can be 0.1uF. Capacitors can be used to adjust the total capacitance of the LCR tank. There can be one or more capacitors. One or more capacitors are connected to the cable under test in the LCR oscillating circuit. According to the requirements of the total capacitance of the LCR oscillating circuit, the connection methods can be various.

例如,接入LCR振荡回路的电容可以包括第一电容和第二电容。在LCR振荡回路中,连接方式一,第一电容、第二电容和被测电缆三者并联;连接方式二,第一电容、第二电容和被测电缆三者串联;连接方式三,第一电容、第二电容和被测电缆三者混联。For example, the capacitor connected to the LCR oscillating circuit may include a first capacitor and a second capacitor. In the LCR oscillating circuit, in the first connection mode, the first capacitor, the second capacitor and the tested cable are connected in parallel; in the second connection mode, the first capacitor, the second capacitor and the tested cable are connected in series; in the third connection mode, the first The capacitor, the second capacitor and the cable under test are connected in parallel.

这样,通过在LCR振荡回路中接入一个或者多个电容,可以调节LCR振荡回路的总电容。尤其是在被测电缆较短的情况下,通过调节LCR振荡回路的总电容,可以达到调节LCR振荡回路的振荡频率的目的。通过调节LCR振荡回路的振荡频率可以使振荡频率接近工频,即接近频率值为50Hz的频率。在振荡频率接近工频的情况下对被测电缆进行缺陷激发比较接近被测电缆的实际工作环境,因此,检测结果会更加准确。在一般情况下,根据实际被测电缆的长度可以调节接入LCR振荡回路的电容的个数,从而可以调节LCR振荡回路的振荡频率的频率值在20Hz到300Hz之间。In this way, by connecting one or more capacitors in the LCR oscillating circuit, the total capacitance of the LCR oscillating circuit can be adjusted. Especially in the case of a short cable to be tested, the purpose of adjusting the oscillation frequency of the LCR oscillating circuit can be achieved by adjusting the total capacitance of the LCR oscillating circuit. By adjusting the oscillating frequency of the LCR oscillating circuit, the oscillating frequency can be made close to the power frequency, that is, close to the frequency with a frequency value of 50 Hz. When the oscillation frequency is close to the power frequency, the defect excitation of the tested cable is closer to the actual working environment of the tested cable, so the detection result will be more accurate. In general, the number of capacitors connected to the LCR oscillating circuit can be adjusted according to the actual length of the cable to be tested, so that the frequency value of the oscillating frequency of the LCR oscillating circuit can be adjusted between 20Hz and 300Hz.

进一步优选地,一个或者多个电容可以与被测电缆同时并联。Further preferably, one or more capacitors can be connected in parallel with the cable under test at the same time.

这样,通过一个或者多个电容与被测电缆同时并联,既可以达到调节LCR振荡回路的振荡频率的目的,又便于电容在现场巡检电缆时接入电路,从而达到有利于现场巡检电缆的放电故障的效果。In this way, by connecting one or more capacitors in parallel with the cable under test at the same time, the purpose of adjusting the oscillation frequency of the LCR oscillating circuit can be achieved, and it is also convenient for the capacitor to be connected to the circuit when the cable is inspected on site, so as to facilitate the on-site inspection of the cable. The effect of discharge failure.

例如,在本发明的实施例中,在LCR振荡回路中可以接入n个电容与被测电缆并联。假设n个电容的电容值相等,其值为C0,单位为F(法拉),被测电缆的等效电容值为Ccable,单位为F(法拉),L表示空心电感的电感值,单位为H(亨特),R表示LCR振荡回路的总电阻的阻值,单位为Ω(欧姆),则LCR振荡回路的振荡频率fosc可根据下式计算得到:For example, in the embodiment of the present invention, n capacitors can be connected in the LCR oscillating circuit and connected in parallel with the cable under test. Assuming that the capacitance values of n capacitors are equal, its value is C 0 , the unit is F (Farad), the equivalent capacitance value of the tested cable is C cable , the unit is F (Farad), and L represents the inductance value of the air-core inductor, the unit is H (Hunter), R represents the resistance value of the total resistance of the LCR oscillating circuit, the unit is Ω (ohm), then the oscillation frequency f osc of the LCR oscillating circuit can be calculated according to the following formula:

ff oseose == 11 -- RR 22 (( CC cablecable ++ nno CC 00 )) 44 LL // 22 ππ LL (( CC cablecable ++ nno CC 00 ))

根据实际被测电缆的长度来确定接入的电容的个数,即n的值,一般情况下接入的电容的个数最多不超过4个。通过接入这些电容,可以调节LCR振荡回路的振荡频率fosc。通过调节LCR振荡回路的振荡频率fosc可以使振荡频率fosc接近工频。振荡频率fosc的取值范围可以达到20Hz到300Hz,例如,其可以是50Hz。The number of connected capacitors, that is, the value of n, is determined according to the actual length of the cable under test. Generally, the number of connected capacitors does not exceed 4 at most. By connecting these capacitors, the oscillation frequency f osc of the LCR oscillation circuit can be adjusted. By adjusting the oscillation frequency f osc of the LCR oscillating circuit, the oscillation frequency f osc can be made close to the power frequency. The value range of the oscillation frequency f osc can reach 20 Hz to 300 Hz, for example, it can be 50 Hz.

在本发明的实施例中,直流电源可以设置在直流电源、电感以及被测电缆三者相连接可以形成一个充电回路。在开关断开时,直流电源可以用来对被测电缆进行直流充电。直流电源的输出电压可以调节和控制,其加压速度也可以调节和控制。直流电源的最大输出直流电压可以是65kV的直流电压,其最大输出直流电流可以是不小于3mA的直流电流。通过改变直流电源的电压可以为被测电缆提供不同的电压环境。例如,通过改变直流电源的电压可以为被测电缆提供65kV及以下的电压环境,从而达到模拟现实情况下电缆传输电力时可能承受的电压。直流电源可以有过流保护和急停保护功能。In the embodiment of the present invention, the DC power supply can be set so that the DC power supply, the inductance and the cable under test are connected to form a charging circuit. When the switch is open, the DC power source can be used to DC charge the cable under test. The output voltage of the DC power supply can be adjusted and controlled, and its pressurization speed can also be adjusted and controlled. The maximum output DC voltage of the DC power supply may be a DC voltage of 65kV, and its maximum output DC current may be a DC current not less than 3mA. Different voltage environments can be provided for the cables under test by changing the voltage of the DC power supply. For example, by changing the voltage of the DC power supply, a voltage environment of 65kV and below can be provided for the cable under test, so as to simulate the voltage that the cable may withstand when transmitting power in reality. The DC power supply can have over-current protection and emergency stop protection functions.

这样,在开关断开时,通过采用直流电源为被测电缆进行直流充电,在开关导通时,LCR振荡回路可以进行阻尼振荡,产生振荡波。通过LCR振荡回路的阻尼振荡产生的振荡波可以为检测被测电缆是否发生放电故障提供振荡波电压。通过LCR振荡回路的阻尼振荡产生的振荡波这种无源谐振技术可以减轻整个装置的质量,这样,在现场巡检时,整个装置可以方便携带,也可以减少对被测电缆的损坏,从而达到有利于现场巡检电缆的放电故障的效果。In this way, when the switch is turned off, the DC power supply is used to charge the cable under test with DC, and when the switch is turned on, the LCR oscillation circuit can perform damped oscillation and generate oscillation waves. The oscillating wave generated by the damped oscillation of the LCR oscillating circuit can provide an oscillating wave voltage for detecting whether a discharge fault occurs in the cable under test. The passive resonant technology of passive resonance technology, such as the oscillating wave generated by the damped oscillation of the LCR oscillating circuit, can reduce the mass of the entire device, so that the entire device can be easily carried during on-site inspections, and can also reduce the damage to the cable under test, thereby achieving It is beneficial to the effect of on-site inspection of the discharge fault of the cable.

在本发明的实施例中,被检测电缆,高压固体开关,电感,电容和直流电源连接在高压回路中,可以用来为检测被测电缆是否存在放电故障问题提供振荡波电压条件。控制单元,PC机,检测阻抗,采集单元和分压器低压臂,连接在低压回路中,可以用来检测被测电缆是否存在放电故障问题。分压器高压臂和耦合电容连接在高压回路和低压回路之间。分压器高压臂可以用来对高压回路的高压进行分压。耦合电容可以是高压耦合电容,高压耦合电容可以用来将高压回路的高压耦合到检测阻抗上。In the embodiment of the present invention, the tested cable, high-voltage solid state switch, inductor, capacitor and DC power supply are connected in the high-voltage circuit, which can be used to provide oscillatory wave voltage conditions for detecting whether there is a discharge fault in the tested cable. The control unit, the PC, the detection impedance, the acquisition unit and the low-voltage arm of the voltage divider are connected in the low-voltage circuit, and can be used to detect whether there is a discharge fault in the cable under test. The high voltage arm of the voltage divider and the coupling capacitor are connected between the high voltage loop and the low voltage loop. The high voltage arm of the voltage divider can be used to divide the high voltage of the high voltage circuit. The coupling capacitor can be a high-voltage coupling capacitor, and the high-voltage coupling capacitor can be used to couple the high voltage of the high-voltage circuit to the detection impedance.

在本发明的实施例中,控制单元可以包括输出模拟信号的输出端和输出数字信号的输出端。模拟信号输出端与直流电源相连接,可以用来调节和控制直流电源的电压。数字信号输出端与高压固体开关相连接,可以用来调节和控制高压固体开关。控制单元的输入端与PC机的输出端相连接,用于接收PC机发出的控制命令。控制单元对直流电源和高压固体开关的控制动作可以依赖于PC机发出的相应的控制指令,其还可以受到检测单元的影响。In an embodiment of the present invention, the control unit may include an output terminal for outputting an analog signal and an output terminal for outputting a digital signal. The analog signal output terminal is connected with the DC power supply and can be used to adjust and control the voltage of the DC power supply. The digital signal output terminal is connected with the high-voltage solid switch, and can be used to adjust and control the high-voltage solid switch. The input end of the control unit is connected with the output end of the PC, and is used for receiving the control commands sent by the PC. The control action of the control unit on the DC power supply and the high-voltage solid switch can depend on the corresponding control commands sent by the PC, which can also be affected by the detection unit.

例如,当检测单元检测到LCR振荡回路没有电压波形时,PC机可以发出报警指令。当PC机发出报警指令时,控制单元可以发现其控制动作是错误的。当控制单元发现其控制动作是错误的时,PC机可以重新发送控制命令给控制单元,以实现控制单元对直流电源和开关的正确控制。For example, when the detection unit detects that there is no voltage waveform in the LCR oscillating circuit, the PC can issue an alarm command. When the PC sends an alarm command, the control unit can find that its control action is wrong. When the control unit finds that its control action is wrong, the PC can resend the control command to the control unit, so as to realize the correct control of the DC power supply and the switch by the control unit.

模拟信号输出端调节和控制直流电源的电压可以是步进式的调节和控制直流电源电压的增大。The analog signal output terminal can adjust and control the voltage of the DC power supply in a stepwise manner to adjust and control the increase of the voltage of the DC power supply.

这样,通过调节和控制直流电源电压的增大可以达到满足整个检测过程对电压环境的要求。模拟信号输出端调节和控制直流电源的电压也可以是调节和控制直流电源的加压速度。In this way, by adjusting and controlling the increase of the DC power supply voltage, the requirements for the voltage environment of the entire detection process can be met. Regulating and controlling the voltage of the DC power supply at the analog signal output terminal can also adjust and control the pressurization speed of the DC power supply.

在本发明的实施例中,检测单元输入端与LCR振荡回路相连接,用于检测LCR振荡回路的脉冲波形。检测单元的输出端与PC机的输入端相连接,用于发送采集到的信号波形给PC机。通过检测LCR振荡回路的脉冲波形情况,可以推断出被测电缆的放电故障情况。In an embodiment of the present invention, the input end of the detection unit is connected to the LCR oscillating circuit for detecting the pulse waveform of the LCR oscillating circuit. The output end of the detection unit is connected with the input end of the PC, and is used to send the collected signal waveform to the PC. By detecting the pulse waveform of the LCR oscillating circuit, the discharge fault of the cable under test can be deduced.

例如,如果检测单元检测到LCR振荡回路有脉冲波形,则表明被测电缆有缺陷,,从而判断出被测电缆存在局部放电现象。如果检测单元检测到LCR振荡回路没有脉冲波形,则表明被测电缆是完好的,从而判断出被测电缆不存在局部放电现象。For example, if the detection unit detects that there is a pulse waveform in the LCR oscillating circuit, it indicates that the tested cable is defective, and thus it can be judged that the tested cable has a partial discharge phenomenon. If the detection unit detects that there is no pulse waveform in the LCR oscillating circuit, it indicates that the cable under test is intact, thus judging that there is no partial discharge phenomenon in the cable under test.

检测单元可以包括高压耦合电容、检测阻抗和采集单元。采集单元可以包括采集卡和信号放大器。高压耦合电容一端与高压回路相连接,另一端与检测阻抗相连接。高压耦合电容将高压回路的高电压耦合到检测阻抗上,高电压耦合到检测阻抗上之后变成低电压。这样,如果被测电缆存在局部放电故障,则检测阻抗上就存在脉冲波形,检测单元就可以检测到检测阻抗上存在的脉冲波形。高压耦合电容与检测阻抗相连接,用于检测LCR振荡回路是否存在脉冲波形以检测被测电缆是否存在放电故障。The detection unit may include a high-voltage coupling capacitor, a detection impedance and an acquisition unit. The acquisition unit may include an acquisition card and a signal amplifier. One end of the high-voltage coupling capacitor is connected to the high-voltage circuit, and the other end is connected to the detection impedance. The high-voltage coupling capacitor couples the high voltage of the high-voltage circuit to the detection impedance, and the high voltage becomes a low voltage after being coupled to the detection impedance. In this way, if the cable under test has a partial discharge fault, there is a pulse waveform on the detection impedance, and the detection unit can detect the pulse waveform on the detection impedance. The high-voltage coupling capacitor is connected to the detection impedance, and is used to detect whether there is a pulse waveform in the LCR oscillating circuit to detect whether there is a discharge fault in the cable under test.

优选地,检测单元还可以包括分压器。分压器可以包括分压器高压臂和分压器低压臂。分压器高压臂和分压器低压臂可以用于将高压回路的电压进行分压。Preferably, the detection unit may further include a voltage divider. The voltage divider may include a high voltage divider arm and a low voltage divider arm. The high-voltage arm of the voltage divider and the low-voltage arm of the voltage divider can be used to divide the voltage of the high-voltage circuit.

这样,通过分压器高压臂和分压器低压臂对高压回路的电压进行分压,从而可以获取低压回路可用的低电压。In this way, the voltage of the high-voltage circuit is divided by the high-voltage arm of the voltage divider and the low-voltage arm of the voltage divider, so that the available low voltage of the low-voltage circuit can be obtained.

采集卡可以包括第一输入端和第二输入端。采集卡第一输入端连接至分压器高压臂和分压器低压臂之间,用于检测LCR振荡回路是否带电。如果直流电源对充电电路充电成功,则LCR振荡回路带电。如果LCR振荡回路带电,则采集卡可以采集到LCR振荡回路的振荡波形。采集卡的第二输入端连接至高压耦合电容和检测阻抗之间,用于采集LCR振荡回路的脉冲波形。如果LCR振荡回路中的被测电缆存在放电故障,则采集卡可以采集到LCR振荡回路的脉冲波形。采集卡的第一输入端和第二输入端的采集速率均可以为100MS/s。采集卡的第一输入端采集到的振荡波形和第二输入端集到的脉冲波形为时间同步的电压波形。采集卡采集到的LCR振荡回路的脉冲信号十分微弱,而微弱信号不利于观察和分析,因此,采集卡与信号放大器相连接,可以用于将微弱的脉冲信号进行信号放大,从而获取利于观察和分析的较强的脉冲信号。信号放大器可以根据实际需要进行增益调节,其增益调节范围可以是0dB到40dB。The capture card may include a first input terminal and a second input terminal. The first input terminal of the acquisition card is connected between the high-voltage arm and the low-voltage arm of the voltage divider to detect whether the LCR oscillation circuit is charged. If the DC power supply successfully charges the charging circuit, the LCR oscillating circuit is charged. If the LCR oscillating circuit is charged, the acquisition card can collect the oscillation waveform of the LCR oscillating circuit. The second input terminal of the acquisition card is connected between the high-voltage coupling capacitor and the detection impedance, and is used for acquiring the pulse waveform of the LCR oscillating circuit. If the cable under test in the LCR oscillating circuit has a discharge fault, the acquisition card can collect the pulse waveform of the LCR oscillating circuit. Both the acquisition rate of the first input end and the second input end of the acquisition card may be 100 MS/s. The oscillation waveform collected by the first input terminal of the acquisition card and the pulse waveform collected by the second input terminal are time-synchronized voltage waveforms. The pulse signal of the LCR oscillating circuit collected by the acquisition card is very weak, and the weak signal is not conducive to observation and analysis. Analysis of stronger pulse signals. The gain of the signal amplifier can be adjusted according to actual needs, and its gain adjustment range can be 0dB to 40dB.

这样,采集卡通过采集两路波形,即电压波形和脉冲波形,可以获取更加详细准确的检测结果。例如,如果采集卡采集到了脉冲波形,则可以对两路波形进行对比,从而可以获取脉冲波形是发生在电压波形的波谷位置、波峰位置还是零点位置等。In this way, the acquisition card can obtain more detailed and accurate detection results by acquiring two waveforms, namely the voltage waveform and the pulse waveform. For example, if the acquisition card collects the pulse waveform, the two waveforms can be compared to obtain whether the pulse waveform occurs at the trough, peak or zero position of the voltage waveform.

在本发明的实施例中,PC机与检测单元的采集单元相连接,PC机上可以有整套的控制程序,能够进行项目管理。PC机上也可以有故障模式库,用来存储所有的故障类型。采集单元可以将集到的脉冲波形上传到PC机,在脉冲波形上传到PC机之后,PC机可以获取该脉冲波形的指纹信息。PC机在获取到该脉冲波形的指纹信息后,可以结合存储在故障模式库中的所有的故障类型对实际测得局部放电故障类型进行标准校准,从而可以识别被测电缆的局部放电故障的类型,并且可以分析被测电缆的局部放电的趋势,进而可以对电缆的缺陷状态进行评估并预测其使用寿命。在脉冲波形上传到PC机之后,PC机可以根据脉冲波形在电缆中传播的行波原理完成脉冲对的匹配。PC机在完成脉冲对的匹配之后,可以根据时间差算法准确计算故障所在的位置,从而完成对故障的定位。PC机还可以与控制单元相连接,用于给控制单元发送控制命令,从而使控制单元控制直流电源进行加压。In the embodiment of the present invention, the PC is connected with the acquisition unit of the detection unit, and there may be a whole set of control programs on the PC for project management. There may also be a failure mode library on the PC to store all failure types. The acquisition unit can upload the collected pulse waveform to the PC, and after the pulse waveform is uploaded to the PC, the PC can obtain the fingerprint information of the pulse waveform. After the PC obtains the fingerprint information of the pulse waveform, it can combine all the fault types stored in the fault mode library to carry out standard calibration on the actual measured partial discharge fault type, so that the type of partial discharge fault of the tested cable can be identified , and can analyze the partial discharge trend of the tested cable, and then can evaluate the defect state of the cable and predict its service life. After the pulse waveform is uploaded to the PC, the PC can complete the matching of the pulse pair according to the traveling wave principle of the pulse waveform propagating in the cable. After the PC completes the matching of pulse pairs, it can accurately calculate the location of the fault according to the time difference algorithm, thereby completing the location of the fault. The PC can also be connected with the control unit to send a control command to the control unit, so that the control unit can control the DC power supply to pressurize.

优选地,在本发明的实施例中,还可以包括屏蔽单元。屏蔽单元可以设置在低压回路中控制单元的输出端和采集单元的输入端。屏蔽单元可以包括电磁屏蔽外壳、滤波器和屏蔽线缆。电磁屏蔽外壳可以是导电材料或者导磁材料。Preferably, in the embodiment of the present invention, a shielding unit may also be included. The shielding unit can be arranged at the output end of the control unit and the input end of the acquisition unit in the low-voltage circuit. The shielding unit may include an electromagnetic shielding shell, a filter, and a shielding cable. The electromagnetic shielding shell can be made of conductive material or magnetic permeable material.

这样,电磁屏蔽外壳通过采用导电导磁的金属材料可以封装整个检测单元与控制单元,从而减小缝隙,达到提高屏蔽电磁干扰的效果,最终达到减小外界干扰以提高检测结果的准确度的效果。In this way, the electromagnetic shielding shell can encapsulate the entire detection unit and control unit by using conductive and magnetic metal materials, thereby reducing the gap, improving the effect of shielding electromagnetic interference, and finally achieving the effect of reducing external interference and improving the accuracy of detection results .

进一步优选地,外壳可以是金属材料。Further preferably, the casing can be made of metal material.

这样,金属材料既可以导电又可以导磁,并且其导电导磁性能好。In this way, the metal material can be both conductive and magnetic, and its conductive and magnetic properties are good.

进一步优选地,外壳可以是钣金外壳。Further preferably, the housing may be a sheet metal housing.

这样,钣金材料不仅导电导磁性能好,而且坚韧性好、机械强度高。In this way, the sheet metal material not only has good electrical and magnetic properties, but also has good toughness and high mechanical strength.

优选地,外壳可以是矩形外壳。Preferably, the housing may be a rectangular housing.

这样,通过采用矩形外壳,在现场巡检时,可以利于其安装。In this way, by adopting a rectangular shell, it can facilitate its installation during on-site inspection.

滤波器可以是EMI滤波器。滤波器可以滤除外界干扰信号。采集单元的输入端和控制单元的输出端可以采用屏蔽线缆以降低外界信号的干扰。The filter may be an EMI filter. The filter can filter out external interference signals. The input end of the acquisition unit and the output end of the control unit can use shielded cables to reduce the interference of external signals.

图2是根据本发明实施例的屏蔽单元设置在采集单元的示意图。Fig. 2 is a schematic diagram of a shielding unit disposed in an acquisition unit according to an embodiment of the present invention.

如图2所示,在本发明的实施例中,屏蔽单元可以设置在采集单元的输入端。屏蔽单元可以包括电磁屏蔽外壳1、滤波器2和屏蔽线缆。As shown in FIG. 2, in the embodiment of the present invention, the shielding unit may be arranged at the input end of the acquisition unit. The shielding unit may include an electromagnetic shielding shell 1, a filter 2 and a shielded cable.

在本发明的实施例中,电磁屏蔽外壳1设置在滤波器2、直流开关电源3、信号放大器4和采集卡5的外围,可以用于屏蔽外界的电磁等干扰信号,以降低外界干扰信号对检测结果的影响,从而达到提高检测结果的准确性的效果。屏蔽外壳1可以是矩形的钣金外壳,矩形的钣金外壳利于工程安装。In an embodiment of the present invention, the electromagnetic shielding shell 1 is arranged on the periphery of the filter 2, the DC switching power supply 3, the signal amplifier 4 and the acquisition card 5, and can be used to shield external electromagnetic interference signals, so as to reduce the impact of external interference signals on The impact of the detection results, so as to achieve the effect of improving the accuracy of the detection results. The shielding case 1 may be a rectangular sheet metal case, which is convenient for engineering installation.

在本发明的实施例中,滤波器2可以是EMI滤波器。滤波器2可以包括一个或者多个。直流开关电源3也可以包括一个或者多个。在实际应用中,EMI滤波器可以连接至电力系统的市电供电端口处。电力系统的市电供电电压为交流(AC)220V的电压。EMI滤波器,也可以连接在所有直流开关电源3的输出端,从而切断干扰信号沿着信号线和电源线的传播途径,减少干扰信号对检测结果的影响,从而达到提高检测结果的准确性的效果。直流开关电源3连接至检测单元输入端和控制单元的输出端。In an embodiment of the present invention, filter 2 may be an EMI filter. Filter 2 may include one or more. The DC switching power supply 3 may also include one or more. In practical applications, the EMI filter can be connected to the mains power supply port of the power system. The mains power supply voltage of the power system is the voltage of alternating current (AC) 220V. The EMI filter can also be connected to the output terminals of all DC switching power supplies 3, thereby cutting off the propagation path of the interference signal along the signal line and the power line, reducing the influence of the interference signal on the detection result, thereby achieving the purpose of improving the accuracy of the detection result Effect. The DC switching power supply 3 is connected to the input end of the detection unit and the output end of the control unit.

在本发明的实施例中,屏蔽线缆可以连接在信号放大器4和采集卡5之间,以切断干扰信号在采集单元的传播途径,减少干扰信号对检测结果的影响,从而达到提高检测结果的准确性的效果。In an embodiment of the present invention, the shielded cable can be connected between the signal amplifier 4 and the acquisition card 5, so as to cut off the propagation path of the interference signal in the acquisition unit, reduce the influence of the interference signal on the detection result, and thereby achieve the goal of improving the detection result. The effect of accuracy.

这样,通过采用屏蔽单元设置在采集单元的输入端,可以减少电磁干扰信号对整个检测过程的干扰,从而达到提高检测结果的精确度的效果。In this way, by setting the shielding unit at the input end of the acquisition unit, the interference of the electromagnetic interference signal on the entire detection process can be reduced, thereby achieving the effect of improving the accuracy of the detection result.

在本发明的实施例中,应用本发明的电缆放电故障检测装置可以准确检测0.1km到10km长度范围内的35kV及以下的电缆的局部放电情况。例如:应用本发明的电缆放电故障检测装置可以准确检测高压交联聚乙烯(XLPE)电缆的局部放电情况,该装置单次检测局部放电量最大可以为50nC。In the embodiment of the present invention, the application of the cable discharge fault detection device of the present invention can accurately detect the partial discharge of cables of 35kV and below within the length range of 0.1km to 10km. For example: the application of the cable discharge fault detection device of the present invention can accurately detect the partial discharge of high-voltage cross-linked polyethylene (XLPE) cables, and the maximum partial discharge detected by the device can be 50nC.

从以上的描述中,可以看出,本发明实现了如下技术效果:From the above description, it can be seen that the present invention achieves the following technical effects:

根据本发明的实施例,通过采用振荡波的电缆放电故障检测装置达到了利于现场巡检电缆是否发生放电故障的效果。According to the embodiment of the present invention, the cable discharge fault detection device using oscillating waves achieves the effect of facilitating on-site inspection of whether the cable discharge fault occurs.

以上所述仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1.一种电缆放电故障检测装置,其特征在于,包括:1. A cable discharge fault detection device, characterized in that, comprising: 直流电源,与断电电缆相连接,用于对所述断电电缆充电;a DC power supply connected to the power-off cable for charging the power-off cable; 电感,与所述直流电源相连接,并且与所述断电电缆相连接;an inductor connected to the DC power supply and connected to the power-off cable; 开关,与所述电感和所述断电电缆形成LCR振荡回路,其中,在所述开关断开时,所述断电电缆充电,在所述开关闭合时,所述断电电缆放电;a switch forming an LCR oscillating loop with the inductor and the power-off cable, wherein when the switch is open, the power-off cable is charged, and when the switch is closed, the power-off cable is discharged; 检测单元,与所述LCR振荡回路相连接,用于检测所述LCR振荡回路的脉冲波形;以及a detection unit, connected to the LCR oscillating circuit, for detecting the pulse waveform of the LCR oscillating circuit; and 电容,所述电容与所述断电电缆相连接,用于调节所述LCR振荡回路的振荡频率以使所述LCR振荡回路的振荡频率接近工频,a capacitor, the capacitor is connected to the power-off cable, and is used to adjust the oscillation frequency of the LCR oscillation circuit so that the oscillation frequency of the LCR oscillation circuit is close to the power frequency, 其中,所述电容包括第一电容和第二电容,所述第一电容、所述第二电容和所述断电电缆三者并联,或者所述第一电容、所述第二电容和所述断电电缆三者串联,或者所述第一电容、所述第二电容和所述断电电缆三者混联。Wherein, the capacitor includes a first capacitor and a second capacitor, and the first capacitor, the second capacitor and the power-off cable are connected in parallel, or the first capacitor, the second capacitor and the The three power-off cables are connected in series, or the first capacitor, the second capacitor and the power-off cable are connected in parallel. 2.根据权利要求1所述的电缆放电故障检测装置,其特征在于,所述开关为高压固体开关。2. The cable discharge fault detection device according to claim 1, wherein the switch is a high-voltage solid switch. 3.根据权利要求1所述的电缆放电故障检测装置,其特征在于,3. cable discharge fault detection device according to claim 1, is characterized in that, 所述直流电源、所述电感、所述开关和所述断电电缆设置在高压回路中,The DC power supply, the inductor, the switch and the power-off cable are arranged in a high-voltage circuit, 所述检测单元设置在低压回路中,The detection unit is arranged in the low-voltage circuit, 所述电缆放电故障检测装置还包括:The cable discharge fault detection device also includes: 分压器,连接在所述高压回路和所述低压回路之间。A voltage divider is connected between the high-voltage circuit and the low-voltage circuit. 4.根据权利要求3所述的电缆放电故障检测装置,其特征在于,所述分压器包括:4. The cable discharge fault detection device according to claim 3, wherein the voltage divider comprises: 分压器高压臂,所述分压器高压臂的第一端连接至所述高压回路;以及a high voltage arm of a voltage divider, the first end of which is connected to the high voltage circuit; and 分压器低压臂,所述分压器低压臂的第一端连接至所述分压器高压臂的第二端。The low voltage arm of the voltage divider, the first end of the low voltage arm of the voltage divider is connected to the second end of the high voltage arm of the voltage divider. 5.根据权利要求4所述的电缆放电故障检测装置,其特征在于,所述检测单元包括:5. The cable discharge fault detection device according to claim 4, wherein the detection unit comprises: 耦合电容,所述耦合电容的第一端连接至所述高压回路;a coupling capacitor, the first end of which is connected to the high voltage circuit; 检测阻抗,所述检测阻抗的第一端连接至所述耦合电容的第二端;以及detection impedance, the first end of the detection impedance is connected to the second end of the coupling capacitor; and 采集单元,所述采集单元的第一输入端连接至所述分压器低压臂的第一端和所述分压器高压臂的第二端之间,所述采集单元的第二输入端连接至所述耦合电容和所述检测阻抗之间。An acquisition unit, the first input end of the acquisition unit is connected between the first end of the low-voltage arm of the voltage divider and the second end of the high-voltage arm of the voltage divider, and the second input end of the acquisition unit is connected between the coupling capacitor and the sense impedance. 6.根据权利要求5所述的电缆放电故障检测装置,其特征在于,还包括:6. The cable discharge fault detection device according to claim 5, further comprising: PC机,所述PC机的第一端与所述采集单元相连接,用于显示和分析所述采集单元采集到的结果,判断所述断电电缆的放电类型和放电位置;以及PC, the first end of the PC is connected to the acquisition unit, used to display and analyze the results collected by the acquisition unit, and judge the discharge type and discharge position of the power-off cable; and 控制单元,所述控制单元的输入端与所述PC机第二端相连接,所述控制单元的第一输出端与所述直流电源相连接,用于控制所述直流电源的电压,所述控制单元的第二输出端与所述开关相连接,用于根据所述采集单元采集到的结果控制所述开关,其中,在所述采集单元未采集到电压波形时,控制所述开关断开。A control unit, the input end of the control unit is connected to the second end of the PC, the first output end of the control unit is connected to the DC power supply, and is used to control the voltage of the DC power supply, the The second output terminal of the control unit is connected to the switch, and is used to control the switch according to the result collected by the acquisition unit, wherein, when the acquisition unit does not collect the voltage waveform, control the switch to turn off . 7.根据权利要求6所述的电缆放电故障检测装置,其特征在于,还包括:屏蔽单元,所述屏蔽单元包括:7. The cable discharge fault detection device according to claim 6, further comprising: a shielding unit, the shielding unit comprising: 外壳;shell; 滤波器,所述滤波器与开关电源的输出端相连接,所述开关电源连接至所述控制单元的输出端和所述采集单元的输入端;以及a filter, the filter is connected to the output terminal of the switching power supply, and the switching power supply is connected to the output terminal of the control unit and the input terminal of the acquisition unit; and 屏蔽线缆,所述屏蔽线缆为所述控制单元的输出端的电缆和所述采集单元的输入端电缆。A shielded cable, the shielded cable is the output cable of the control unit and the input cable of the acquisition unit.
CN201310313615.5A 2013-07-19 2013-07-19 Cable discharge failure detector Expired - Fee Related CN103364699B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310313615.5A CN103364699B (en) 2013-07-19 2013-07-19 Cable discharge failure detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310313615.5A CN103364699B (en) 2013-07-19 2013-07-19 Cable discharge failure detector

Publications (2)

Publication Number Publication Date
CN103364699A CN103364699A (en) 2013-10-23
CN103364699B true CN103364699B (en) 2016-03-09

Family

ID=49366490

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310313615.5A Expired - Fee Related CN103364699B (en) 2013-07-19 2013-07-19 Cable discharge failure detector

Country Status (1)

Country Link
CN (1) CN103364699B (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103852697B (en) * 2014-02-20 2015-05-13 广州供电局有限公司 Cable partial discharge detection device
CN105334442A (en) * 2014-08-08 2016-02-17 国家电网公司 Cable partial discharge measuring circuit and device
CN104808121A (en) * 2015-04-13 2015-07-29 国家电网公司 Distributing cable partial discharge test method based on oscillatory wave test
CN104777386A (en) * 2015-04-22 2015-07-15 西南石油大学 Failure analyzing and detecting system for cable accessories
CN106443370A (en) * 2016-08-30 2017-02-22 合肥智博电气有限公司 Cable insulation detection device based on oscillatory wave test
CN108254659A (en) * 2017-12-25 2018-07-06 国网电力科学研究院武汉南瑞有限责任公司 The shelf depreciation of cable and the combined detection system of leakage current and method under high direct voltage
CN108037418A (en) * 2017-12-29 2018-05-15 国网北京市电力公司 FLU Fault Location Unit, method and device
CN107957540A (en) * 2017-12-29 2018-04-24 广州供电局有限公司 The production method of electric cable stoppage transition joint and the detection device of cable local discharge
CN108614199A (en) * 2018-04-26 2018-10-02 广州供电局有限公司 Power cable defect model test platform
CN108736459A (en) * 2018-06-05 2018-11-02 云南电网有限责任公司普洱供电局 A kind of charge discharge device of high-tension cable
CN108828408B (en) * 2018-07-11 2023-06-06 江阴市华能电热器材有限公司 Device and method for nondestructively measuring buried skin effect electric tracing high-resistance grounding fault
CN109884444A (en) * 2019-01-18 2019-06-14 国网山东省电力公司临沂供电公司 An intelligent monitoring system and method for cable running state
CN109802490A (en) * 2019-02-21 2019-05-24 国网山东省电力公司临沂供电公司 A kind of intelligent platform of substation's electrification fortune inspection
CN109765461A (en) * 2019-02-21 2019-05-17 国网山东省电力公司临沂供电公司 Transmission line monitoring system and method based on temperature monitoring

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4216262C2 (en) * 1992-05-16 1998-01-15 Pmk Mess Und Kommunikationstec Meter connector for probe cable
CN2748927Y (en) * 2004-08-06 2005-12-28 华北电力大学(北京) Local discharging ultrahigh frequency online fault positioning device for gas insulation transformer station
CN202770953U (en) * 2012-07-24 2013-03-06 江苏省电力公司电力科学研究院 Partial discharge detector for oscillating wave of crosslinked cable

Also Published As

Publication number Publication date
CN103364699A (en) 2013-10-23

Similar Documents

Publication Publication Date Title
CN103364699B (en) Cable discharge failure detector
CN103852697B (en) Cable partial discharge detection device
CN102798782B (en) High-voltage insulation resistance monitoring alarm
CN103675624B (en) A kind of spark gap working-frequency voltage test device and test method
CN105785156A (en) Transformer station intelligent electronic device multi-source anti-interference degree characteristic testing method
CN107390081A (en) It is a kind of to be used for the device and method being monitored powered to deformation of transformer winding
CN105486987A (en) Partial discharge detection system
CN108646125B (en) Method, device and system for testing capacitance current
CN107544044A (en) GIS built-in ultrahigh frequency transducer sensitivity on-site calibration devices and method of calibration
CN103076587A (en) Sensor receiving performance calibration method and system and ultrasonic pulse generator
CN205374670U (en) A tunable frequency oscillating wave circuit for power cable partial discharge detector
CN103207355B (en) Cable local discharge signal detection system and method
CN204256111U (en) Partial discharge detecting system
CN204241625U (en) A kind of withstand voltage distance measuring equipment exchanged based on ultralow frequency
CN103149518B (en) Partial discharge test circuit
CN108776290A (en) A kind of cable Sasser testing equipment and its application method
CN111562475A (en) Circuit for detecting partial discharge amount of variable frequency power supply for high-voltage test and evaluation method
CN111505557B (en) A portable lightning arrester online monitoring device and on-site calibration method
CN202351421U (en) Error detection device for current transformer
CN210604856U (en) Oscillation wave partial discharge detection device without detection blind zone
CN117289098A (en) Offline partial discharge testing device and method for medium-voltage long-distance cable
CN108548983B (en) Method, device and system for testing capacitance current
CN207281235U (en) A kind of partial discharge intensity's detection circuit based on series process
CN201548607U (en) Substation resonance overvoltage analysis system
CN203950010U (en) Cable local discharge detection device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160309