CN111856216A - A kind of live test device and method for cross-connection metal sheath defect of high-voltage cable - Google Patents
A kind of live test device and method for cross-connection metal sheath defect of high-voltage cable Download PDFInfo
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Abstract
本发明公开了一种高压电缆交叉互联金属护套缺陷带电测试装置及方法，本发明利用直流电源对交叉互联段一组电缆保护接地侧的两相连接排施加直流电，利用直流电压测量装置测量两相连接排之间的电压，利用直流测试装置测量连接排两侧的电流，从而获得交叉互联段各金属护套的电阻，根据阻值判断出电缆金属护套是否连接缺陷，可在高压电缆线路带电状态下开展测试，时效性强、灵活，具有良好的应用前景。
The invention discloses a live test device and method for cross-connection metal sheath defects of high-voltage cables. The invention uses a direct-current power supply to apply direct current to two-phase connection bars on the protective grounding side of a group of cables in a cross-connection section, and uses a direct-current voltage measuring device to measure the two-phase connection. The voltage between the phase connection bars, the current on both sides of the connection bars is measured by a DC test device, so as to obtain the resistance of each metal sheath of the cross-connection section, and judge whether the cable metal sheath is connected defective according to the resistance value, which can be used in high-voltage cable lines. The test is carried out in a charged state, which is time-sensitive and flexible, and has a good application prospect.
Description
技术领域technical field
本发明涉及一种高压电缆交叉互联金属护套缺陷带电测试装置及方法，属于输变电设备技术领域。The invention relates to a live test device and method for cross-connecting metal sheath defects of high-voltage cables, and belongs to the technical field of power transmission and transformation equipment.
背景技术Background technique
高压电缆三相交叉互联段金属护套电气连接缺陷，极易引起电缆铝护套或电缆附件内部金属悬浮放电，引发电缆故障。由于电缆金属护套长度长，并与附件尾管、接头和接地箱铜排连接，电气连接复杂。传统检测方法仅能在线路停役时开展测试，需要线路停役、时效差且存在局限性。Defects in the electrical connection of the metal sheath of the three-phase cross-connection section of the high-voltage cable can easily lead to the suspension discharge of the metal in the aluminum sheath of the cable or the interior of the cable accessories, resulting in cable failure. The electrical connection is complicated due to the long length of the cable metal sheath and the connection with the accessory tail pipe, connector and grounding box copper bar. The traditional detection method can only carry out the test when the line is out of service, which requires the line to be out of service, has poor timeliness and has limitations.
发明内容SUMMARY OF THE INVENTION
本发明提供了一种高压电缆交叉互联金属护套缺陷带电测试装置及方法，解决了背景技术中披露的问题。The present invention provides a live test device and method for cross-connecting metal sheath defects of high-voltage cables, and solves the problems disclosed in the background art.
为了解决上述技术问题，本发明所采用的技术方案是：In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:
一种高压电缆交叉互联金属护套缺陷带电测试装置，包括直流供电电路、直流电压测量装置和直流测试装置；A live test device for cross-connection metal sheath defects of high-voltage cables, comprising a DC power supply circuit, a DC voltage measurement device and a DC test device;
直流供电电路的两端分别外接交叉互联段一组电缆保护接地侧的任意两相连接排，给连接排所连的金属护套施加直流电；Both ends of the DC power supply circuit are respectively connected to any two-phase connection bar on the protective grounding side of a group of cables in the cross-connection section, and DC power is applied to the metal sheath connected to the connection bar;
直流电压测量装置测量直流供电电路所连两相连接排之间的电压；The DC voltage measuring device measures the voltage between the two-phase connection bars connected to the DC power supply circuit;
直流测试装置测量直流供电电路所连连接排两侧的电流。The DC test set measures the current on both sides of the connected row to which the DC supply circuit is connected.
直流测试装置包括直流电流传感器以及与直流电流传感器连接的第一直流测量设备，直流电流传感器可拆卸式设于连接排一侧，通过调整直流电流传感器位置，测量接排两侧的电流。The DC test device includes a DC current sensor and a first DC measurement device connected to the DC current sensor. The DC current sensor is detachably arranged on one side of the connection row, and the current on both sides of the connection row is measured by adjusting the position of the DC current sensor.
直流供电电路包括串联的直流电源和第二直流测量设备，直流电压测量装置与直流供电电路并联，并联的两端均通过限流设备外接连接排。The DC power supply circuit includes a series-connected DC power supply and a second DC measurement device, the DC voltage measurement device is connected in parallel with the DC power supply circuit, and both ends of the parallel connection are connected externally through the current limiting device.
直流电源为蓄电池电源或输出电流波纹系数不超过0.1％的恒流源。The DC power source is a battery power source or a constant current source whose output current ripple factor does not exceed 0.1%.
限流设备为金属线圈或电阻。Current limiting devices are metal coils or resistors.
直流电压测量装置精度不低于0.2级，第一直流测量设备精度不低于0.2级，第二直流测量设备精度不低于0.5级。The accuracy of the DC voltage measurement device is not lower than 0.2, the accuracy of the first DC measurement device is not lower than 0.2, and the accuracy of the second DC measurement device is not lower than 0.5.
一种高压电缆交叉互联金属护套缺陷带电测试装置的方法，包括，A method for a live test device for cross-connection metal sheath defects of high-voltage cables, comprising,
遍历所有交叉互联段三相连接排的两两组合方式，通过直流供电电路对每种组合方式的两相连接排所连金属护套施加直流电，通过直流电压测量装置测量每种组合方式的两相连接排之间的电压，通过直流测试装置测量每种组合方式下直流供电电路所连连接排两侧的电流；Traverse all the pairwise combinations of the three-phase connection bars of all the cross-connected sections, apply DC power to the metal sheaths connected to the two-phase connection bars of each combination through the DC power supply circuit, and measure the two-phase of each combination by the DC voltage measuring device. For the voltage between the connecting rows, measure the current on both sides of the connecting row connected to the DC power supply circuit under each combination mode through a DC test device;
根据霍夫及欧姆定律，构建所有两相连接排之间的电压方程，计算交叉互联段各金属护套的电阻；According to Hough and Ohm's law, construct the voltage equation between all two-phase connection bars, and calculate the resistance of each metal sheath in the cross-connected section;
响应于金属护套电阻大于阈值，则判定相应金属护套连接缺陷。In response to the metal sheath resistance being greater than the threshold value, a corresponding metal sheath connection defect is determined.
响应于直流电压测量装置与串联的直流电源和第二直流测量设备构成的直流供电电路并联，并且并联的两端均通过限流设备外接连接排，直流电压测量装置测量两相连接排之间的电压与两限流设备电压之和，先根据第二直流测量设备测量的直流供电电路电流、两限流设备的电阻，计算两相连接排之间的电压，然后构建两相连接排之间电压的电压方程。In response to the DC voltage measurement device being connected in parallel with the DC power supply circuit formed by the series-connected DC power source and the second DC measurement device, and both ends of the parallel connection are connected to the external connection row through the current limiting device, the DC voltage measurement device measures the voltage between the two-phase connection rows. The sum of the voltage and the voltage of the two current-limiting devices, first calculate the voltage between the two-phase connection bars according to the current of the DC power supply circuit measured by the second DC measuring device and the resistance of the two current-limiting devices, and then construct the voltage between the two-phase connection bars voltage equation.
阈值为10Ω。The threshold is 10Ω.
本发明所达到的有益效果：本发明利用直流电源对交叉互联段一组电缆保护接地侧的两相连接排施加直流电，利用直流电压测量装置测量两相连接排之间的电压，利用直流测试装置测量连接排两侧的电流，从而获得交叉互联段各金属护套的电阻，根据阻值判断出电缆金属护套是否连接缺陷，可在高压电缆线路带电状态下开展测试，时效性强、灵活，具有良好的应用前景。The beneficial effects achieved by the present invention are as follows: the present invention utilizes a DC power supply to apply a DC power to the two-phase connection bars on the protective grounding side of a group of cables in a cross-connected section, uses a DC voltage measurement device to measure the voltage between the two-phase connection bars, and uses a DC test device to measure the voltage between the two-phase connection bars. Measure the current on both sides of the connection row to obtain the resistance of each metal sheath in the cross-connected section, and judge whether the cable metal sheath is connected to defects according to the resistance value. Has a good application prospect.
附图说明Description of drawings
图1为本发明装置的结构示意图；Fig. 1 is the structural representation of the device of the present invention;
图2为高压电缆线路交叉互联接地系统示意图；Figure 2 is a schematic diagram of a cross-connection grounding system for high-voltage cable lines;
图3为高压电缆接地交叉互联系统等效电路图；Figure 3 is an equivalent circuit diagram of a high-voltage cable grounding cross-connection system;
图4为电压和电流在等效电路图中的示意图；4 is a schematic diagram of voltage and current in an equivalent circuit diagram;
图5为构建的方程示意图。Figure 5 is a schematic diagram of the constructed equation.
具体实施方式Detailed ways
下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.
一种高压电缆交叉互联金属护套缺陷带电测试装置，包括直流供电电路、直流电压测量装置和直流测试装置。The utility model relates to a live test device for cross-connecting metal sheath defects of high-voltage cables, comprising a DC power supply circuit, a DC voltage measurement device and a DC test device.
直流供电电路的两端分别外接交叉互联段一组电缆保护接地侧的任意两相连接排，给连接排所连的金属护套施加直流电；直流电压测量装置测量直流供电电路所连两相连接排之间的电压；直流测试装置测量直流供电电路所连连接排两侧的电流。Both ends of the DC power supply circuit are connected to any two-phase connection bar on the protective grounding side of a group of cables in the cross-connection section respectively, and DC power is applied to the metal sheath connected to the connection bar; the DC voltage measurement device measures the two-phase connection bar connected to the DC power supply circuit. The voltage between them; the DC test device measures the current on both sides of the connected row to which the DC supply circuit is connected.
上述装置的具体结构如图1所示，直流供电电路、直流电压测量装置、直流测试装置、两限流设备和两线夹。The specific structure of the above device is shown in FIG. 1 , which includes a DC power supply circuit, a DC voltage measurement device, a DC test device, two current limiting devices and two wire clips.
其中，直流供电电路包括串联的直流电源和第二直流测量设备(两者的串联顺序可任意)，直流电压测量装置与直流供电电路并联，为了限制金属护套感应电压对于测试装备(即直流电压测量装置和直流测量设备)的影响，并联的两端均通过限流设备外接连接排，限流设备为金属线圈或电阻，阻值不小于10Ω，两限流设备具体通过两线夹接连接排。此时直流电压测量装置测量的是两相连接排之间的电压与两限流设备电压之和，因此在计算金属护套阻值之前，需要根据第二直流测量设备测量的直流供电电路电流、两限流设备的电阻，计算两相连接排之间的电压。Among them, the DC power supply circuit includes a series-connected DC power supply and a second DC measurement device (the sequence of the two can be arbitrary), and the DC voltage measurement device is connected in parallel with the DC power supply circuit. The influence of the measuring device and the DC measuring device), both ends of the parallel connection are connected to the external connection row through the current limiting device. The current limiting device is a metal coil or resistance, and the resistance value is not less than 10Ω. . At this time, the DC voltage measuring device measures the sum of the voltage between the two-phase connection bars and the two current-limiting equipment voltages. Therefore, before calculating the resistance value of the metal sheath, it is necessary to measure the current of the DC power supply circuit according to the second DC measuring device, The resistance of the two current limiting devices, calculate the voltage between the two phase connection bars.
直流测试装置包括直流电流传感器以及与直流电流传感器连接的第一直流测量设备，直流电流传感器可拆卸式设于连接排一侧，通过调整直流电流传感器位置，测量接排两侧的电流。假设连接排连接A1相金属护套和B2相金属护套，则将直流电流传感器可拆卸式设于A1相金属护套，可测量A1相金属护套的电流，将直流电流传感器可拆卸式设于B2相金属护套，可测量B2相金属护套的电流。The DC test device includes a DC current sensor and a first DC measurement device connected to the DC current sensor. The DC current sensor is detachably arranged on one side of the connection row, and the current on both sides of the connection row is measured by adjusting the position of the DC current sensor. Assuming that the connection bar is connected to the A1-phase metal sheath and the B2-phase metal sheath, the DC current sensor can be detachably installed on the A1-phase metal sheath to measure the current of the A1-phase metal sheath, and the DC current sensor can be detachably installed. For the B2 phase metal sheath, the current of the B2 phase metal sheath can be measured.
上述直流电源为蓄电池电源或输出电流波纹系数不超过0.1％的恒流源；直流电压测量装置精度不低于0.2级，第一直流测量设备精度不低于0.2级，第二直流测量设备精度不低于0.5级。The above-mentioned DC power source is a battery power source or a constant current source with an output current ripple factor of not more than 0.1%; the accuracy of the DC voltage measurement device is not lower than 0.2, the accuracy of the first DC measurement device is not lower than 0.2, and the accuracy of the second DC measurement device is not lower than 0.2. Not less than level 0.5.
上述高压电缆交叉互联金属护套缺陷带电测试装置的方法，包括以下步骤：The method of the above-mentioned high-voltage cable cross-connection metal sheath defect live test device includes the following steps:
步骤1，遍历所有交叉互联段三相连接排的两两组合方式，通过直流供电电路对每种组合方式的两相连接排所连金属护套施加直流电，通过直流电压测量装置测量每种组合方式的两相连接排之间的电压，通过直流测试装置测量每种组合方式下直流供电电路所连连接排两侧的电流；Step 1, traverse all the pairwise combinations of the three-phase connection bars of the cross-connected section, apply DC power to the metal sheaths connected to the two-phase connection bars of each combination through the DC power supply circuit, and measure each combination by the DC voltage measuring device. Measure the voltage between the two-phase connection row of the DC power supply circuit and measure the current on both sides of the connection row connected to the DC power supply circuit under each combination mode through the DC test device;
步骤2，根据霍夫及欧姆定律，构建所有两相连接排之间的电压方程，计算交叉互联段各金属护套的电阻；Step 2, according to Hough and Ohm's law, construct the voltage equation between all the two-phase connection bars, and calculate the resistance of each metal sheath in the cross-connection section;
步骤3，响应于金属护套电阻大于阈值，阈值为10Ω，则判定相应金属护套连接缺陷。Step 3, in response to the resistance of the metal sheath being greater than the threshold value, and the threshold value is 10Ω, determine the connection defect of the corresponding metal sheath.
若直流电压测量装置与串联的直流电源和第二直流测量设备构成的直流供电电路并联，并且并联的两端均通过限流设备外接连接排(即图1中的结构)，直流电压测量装置测量两相连接排之间的电压与两限流设备电压之和，先根据第二直流测量设备测量的直流供电电路电流、两限流设备的电阻，计算两相连接排之间的电压，然后构建两相连接排之间电压的电压方程。If the DC voltage measurement device is connected in parallel with the DC power supply circuit formed by the series-connected DC power supply and the second DC measurement device, and both ends of the parallel connection are connected externally through the current limiting device (ie, the structure in Figure 1), the DC voltage measurement device measures The sum of the voltage between the two-phase connection bars and the voltage of the two current-limiting devices, first calculate the voltage between the two-phase connection bars according to the current of the DC power supply circuit measured by the second DC measuring device and the resistance of the two current-limiting devices, and then construct The voltage equation for the voltage between the two-phase connection bars.
为了进一步说明上述方法，举例如下：To further illustrate the above method, an example is as follows:
图2为高压电缆线路交叉互联接地系统，交叉互联段为三段交叉互联，第一段为A1、B1、C1段(第一段的三相金属护套)，第二段A2、B2、C2(第二段的三相金属护套)，第三段为A3、B3、C3段(第三段的三相金属护套)，其中A1、A2、A3首段相连，并通过接地引线或大地与C1、C2、C3末端相连；A1-B2-C3段间相互连接，A2-B3-C1段间相互连接，A3-B1-C2段间相互连接；其等效电路如图3所示。Figure 2 shows the cross-connection grounding system of high-voltage cable lines. The cross-connection section is a three-stage cross-connection. The first section is A1, B1, and C1 (three-phase metal sheath of the first section), and the second section is A2, B2, and C2. (three-phase metal sheath of the second section), and the third section is A3, B3, and C3 sections (three-phase metal sheath of the third section), of which the first sections of A1, A2, and A3 are connected and connected through the grounding lead or the earth It is connected to the ends of C1, C2 and C3; the A1-B2-C3 segments are connected to each other, the A2-B3-C1 segments are connected to each other, and the A3-B1-C2 segments are connected to each other; the equivalent circuit is shown in Figure 3.
两线夹分别连接A1-B2之间的连接排和A2-B3之间的连接排，施加直流电后，可获得如图4所示的U(A1-A2)、IA11、IA21、IB11、IB21，因此可构建图5所示的方程U(A1-A2)＝RA1*IA11+RA2*IA21＝(RB2+RC3)*IB21+(RB3+RC1)*IB31。The two clips are respectively connected to the connection row between A1-B2 and the connection row between A2-B3. After applying DC power, U(A1-A2), IA11, IA21, IB11, IB21 as shown in Figure 4 can be obtained, The equation U(A1-A2)=RA1*IA11+RA2*IA21=(RB2+RC3)*IB21+(RB3+RC1)*IB31 can thus be constructed as shown in FIG. 5 .
同理两线夹分别连接A2-B3之间的连接排和A3-B1之间的连接排，A1-B2之间的连接排和A3-B1之间的连接排，B1-C2之间的连接排和B2-C3之间的连接排，B1-C2之间的连接排与B3-C1、B2-C3之间的连接排和B3-C1之间的连接排。In the same way, the two clips connect the connection row between A2-B3 and the connection row between A3-B1, the connection row between A1-B2 and the connection row between A3-B1, and the connection between B1-C2. The row and the connection row between B2-C3, the connection row between B1-C2 and B3-C1, the connection row between B2-C3 and the connection row between B3-C1.
共获得如表1所示的数据。The data shown in Table 1 were obtained.
如表1测量数据Measurement data as shown in Table 1
共构建以下方程：The following equations are constructed:
U(A1-A2)＝RA1*IA11+RA2*IA21＝(RB2+RC3)*IB21+(RB3+RC1)*IB31U(A1-A2)=RA1*IA11+RA2*IA21=(RB2+RC3)*IB21+(RB3+RC1)*IB31
U(A1-A3)＝RA1*IA12+RA3*IA32＝(RB2+RC3)*IB22+(RB1+RC2)*IB12U(A1-A3)=RA1*IA12+RA3*IA32=(RB2+RC3)*IB22+(RB1+RC2)*IB12
U(A2-A3)＝RA2*IA23+RA3*IA33＝(RB3+RC1)*IB33+(RB1+RC2)*IB13U(A2-A3)=RA2*IA23+RA3*IA33=(RB3+RC1)*IB33+(RB1+RC2)*IB13
U(C1-C2)＝RC1*IC14+RC2*IC24＝(RB3+RA1)*IB34+(RB1+RA3)*IB14U(C1-C2)=RC1*IC14+RC2*IC24=(RB3+RA1)*IB34+(RB1+RA3)*IB14
U(C1-C3)＝RC1*IC15+RC3*IC35＝(RB3+RA1)*IB35+(RB2+RA1)*IB25U(C1-C3)=RC1*IC15+RC3*IC35=(RB3+RA1)*IB35+(RB2+RA1)*IB25
U(C2-C3)＝RC2*IC26+RC3*IC36＝(RB1+RA3)*IB16+(RB2+RA1)*IB26U(C2-C3)=RC2*IC26+RC3*IC36=(RB1+RA3)*IB16+(RB2+RA1)*IB26
代入数据得到如下参数：Substitute the data to get the following parameters:
25.5＝RA1*1.1+RA2*88.9＝(RB2+RC3)*28.4+(RB3+RC1)*59.525.5=RA1*1.1+RA2*88.9=(RB2+RC3)*28.4+(RB3+RC1)*59.5
33.9＝RA1*1.4+RA3*118.6＝(RB2+RC3)*37.9+(RB1+RC2)*79.333.9=RA1*1.4+RA3*118.6=(RB2+RC3)*37.9+(RB1+RC2)*79.3
14.6＝RA2*66.7+RA3*33.3＝(RB3+RC1)*66.7+(RB1+RC2)*33.314.6=RA2*66.7+RA3*33.3=(RB3+RC1)*66.7+(RB1+RC2)*33.3
19.1＝RC1*18.9+RC2*99.6＝(RB3+RA1)*0.7+(RB1+RA3)*119.319.1=RC1*18.9+RC2*99.6=(RB3+RA1)*0.7+(RB1+RA3)*119.3
15.9＝RC1*15.8+RC3*83＝(RB3+RA1)*0.6+(RB2+RA1)*99.415.9=RC1*15.8+RC3*83=(RB3+RA1)*0.6+(RB2+RA1)*99.4
16.6＝RC2*40+RC3*80＝(RB1+RA3)*40+(RB2+RA1)*8016.6=RC2*40+RC3*80=(RB1+RA3)*40+(RB2+RA1)*80
计算出RA1、RA2、RA3、R(B2+C3)、R(B3+C1)以及R(B1+C2)分别为20 000mΩ、80mΩ、80mΩ、160mΩ、160mΩ、160mΩ；计算得RC1、RC2、RC3、R(B3+A1)、R(B1+A3)以及R(B2+A1)分别为80mΩ、80mΩ、80mΩ、20080mΩ、160mΩ、20080mΩ。Calculated RA1, RA2, RA3, R(B2+C3), R(B3+C1) and R(B1+C2) are 20 000mΩ, 80mΩ, 80mΩ, 160mΩ, 160mΩ, 160mΩ respectively; calculated RC1, RC2, RC3 , R(B3+A1), R(B1+A3) and R(B2+A1) are 80mΩ, 80mΩ, 80mΩ, 20080mΩ, 160mΩ, and 20080mΩ, respectively.
由于R(B2+C3)＝RB2+RC3；R(B3+C1)＝RB3+RC1；R(B1+C2)＝RB1+RC2；代入RA1、RA2、RA3及RC1、RC2、RC3，得RB1、RB2、RB3分别为80mΩ、80mΩ、80mΩ。Since R(B2+C3)=RB2+RC3; R(B3+C1)=RB3+RC1; R(B1+C2)=RB1+RC2; substitute RA1, RA2, RA3 and RC1, RC2, RC3 to get RB1, RB2 and RB3 are respectively 80mΩ, 80mΩ, and 80mΩ.
将RB1、RB2、RB3及RA1、RA2、RA3代入如下公式：Substitute RB1, RB2, RB3 and RA1, RA2, RA3 into the following formula:
R(B3+A1)＝RB3+RA1、R(B1+A3)＝RB1+RA3、R(B2+A1)＝RB2+RA1、进行验证，等式相等表明计算正确。R(B3+A1)=RB3+RA1, R(B1+A3)=RB1+RA3, R(B2+A1)=RB2+RA1, to verify, the equality of the equations indicates that the calculation is correct.
根据计算结果发现RA1＝20欧，大于10欧，判断电缆金属护套连接缺陷。According to the calculation results, it is found that RA1 = 20 ohms, which is greater than 10 ohms, and the connection defect of the cable metal sheath is judged.
本发明利用直流电源对交叉互联段一组电缆保护接地侧的两相连接排施加直流电，利用直流电压测量装置测量两相连接排之间的电压，利用直流测试装置测量连接排两侧的电流，从而获得交叉互联段各金属护套的电阻，根据阻值判断出电缆金属护套是否连接缺陷，可在高压电缆线路带电状态下开展测试，时效性强、灵活，具有良好的应用前景。The present invention utilizes the direct current power supply to apply direct current to the two-phase connection row on the protective grounding side of a group of cables in the cross-connected section, uses the DC voltage measuring device to measure the voltage between the two-phase connection rows, and uses the DC testing device to measure the current on both sides of the connection row, In this way, the resistance of each metal sheath of the cross-connection section is obtained, and whether the cable metal sheath is connected is defective according to the resistance value. The test can be carried out in the live state of the high-voltage cable line, which has strong timeliness and flexibility, and has a good application prospect.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和变形，这些改进和变形也应视为本发明的保护范围。The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.
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