CN-122015624-A - Cable length tester for power grid construction

Abstract

The invention discloses a cable length tester for power grid construction, which comprises a shell, at least two cable access ends, a measurement control unit, a display unit and a power supply unit, wherein the measurement control unit is used for calculating and determining a length measured value of a cable to be tested based on capacitance parameters and/or resistance parameters, the display unit is connected with the measurement control unit and used for displaying a measured result, and the power supply unit is used for supplying power to the cable length tester. The intelligent cable length data acquisition device has the advantages that the internal part is highly integrated, the external operation buttons are simple and convenient to operate, measurement information can be intelligently displayed, the cable length data can be quickly and accurately obtained through the conversion of a special algorithm in an impedance or capacitive reactance mode, the accurate cable length data can be obtained without manual measurement, the workload is reduced, the material loss and the waste caused by manual misoperation are prevented, the intelligent degree is high, the operation is simple and convenient, the display type is clear, the whole is small and exquisite, and the portable cable length data acquisition device is convenient to carry.

Inventors

• QIN XIANKUN
• ZHONG SHULIN
• Li Zhencan
• LI YANG
• LIN JIACHENG
• WANG JING
• ZHANG WENPENG
• CHEN XINGZHUO
• LI HAISHENG
• YANG XUEFEI
• OU JUNYAN
• LEI MING
• YE QING
• TIAN XIANGGUI
• LIU YOUQIANG
• Liang Chengning
• WU CHUNHONG

Assignees

• 中国南方电网有限责任公司超高压输电公司柳州局

Dates

Publication Date

20260512

Application Date

20260213

Claims (10)

1. 1. A cable length tester for power grid construction, comprising: A housing; At least two cable access terminals for connecting the cable to be tested; The measurement control unit is arranged in the shell and is configured to measure capacitance parameters and/or resistance parameters of the cable to be measured through the cable access end, and the length measurement value of the cable to be measured is calculated and determined based on the capacitance parameters and/or the resistance parameters; the display unit is connected with the measurement control unit and used for displaying measurement results; And the power supply unit is used for supplying power to the cable length tester.
2. 2. A cable length tester for power grid construction according to claim 1, wherein, The measurement control unit is configured to: Measuring capacitance parameters and resistance parameters of the cable to be tested through the cable access terminal; Based on a capacitance value and a resistance value of a unit length of a cable with a preset standard length, calculating to obtain a first length value and a second length value according to the capacitance parameter and the resistance parameter respectively; and calculating and determining the length measurement value of the cable to be measured according to the first length value and the second length value.
3. 3. A cable length tester for power grid construction according to claim 2, wherein the length measurement value of the cable under test is determined by an average value of the first length value and the second length value.
4. 4. The cable length tester for power grid construction according to claim 2, wherein the display unit is configured as a touch screen, the measurement control unit is further configured to measure and store the capacitance value per unit length and the resistance value per unit length using a standard cable of a known length based on a calibration instruction input from a user from the touch screen before performing the length measurement; Or the display unit is configured as a display screen and an operation panel, and the measurement control unit is further configured to measure and store the capacitance value per unit length and the resistance value per unit length using a standard cable of a known length based on a calibration instruction input from the operation panel by a user before performing the length measurement.
5. 5. The cable length tester for power grid construction according to claim 1, wherein the measurement control unit is specifically configured to perform the following operations to obtain the capacitance parameter: And respectively connecting the at least two cable access ends to two ends of the cable to be measured, and measuring to obtain the total capacitance value of the cable to be measured as the capacitance parameter.
6. 6. The cable length tester for power grid construction according to claim 1, wherein the measurement control unit is specifically configured to perform the following operations to obtain the resistance parameter: And shorting at least two conductors at one end of the cable to be tested, respectively connecting the shorting end and the corresponding conductor at the other end of the cable to the at least two cable access ends, and measuring to obtain the loop resistance value of the cable to be tested as the resistance parameter.
7. 7. The cable length tester for power grid construction according to claim 1, wherein the power supply unit comprises a rechargeable battery, and an external charging interface electrically connected with the rechargeable battery is arranged on the housing.
8. 8. The cable length tester for power grid construction of claim 1, wherein the cable access end cap has an insulating cap.
9. 9. The cable length tester for power grid construction according to claim 1, wherein the measurement control unit is configured as an integrated circuit board in which a capacitive reactance detection circuit and an impedance detection circuit are integrated, and a surface of the circuit board is provided with an anti-corrosion waterproof coating.
10. 10. The cable length tester for power grid construction of claim 1, wherein the housing is configured as a closed waterproof structure.

Description

Cable length tester for power grid construction Technical Field The invention relates to the technical field of power grid construction, in particular to cable length testing equipment. Background With the acceleration of new urbanization process and continuous upgrade of smart power grids, ground cable laying, network cable layout and daily maintenance work of substations and distribution stations become a normalization task of power grid operation and maintenance. As a core carrier for communicating power transmission and signals, accurate control of the cable length is a key link for guaranteeing construction quality. If the cable length is too short, new cables need to be cut again and connected, the current construction flow can be directly interrupted, the stability of a power supply line can be reduced due to an additionally increased connector, and potential threat is formed to the safe operation of a regional power grid. At present, the measurement and shearing of the cable length in the industry still generally depends on the traditional manual tape operation mode. The method is low in efficiency, in complex environments with narrow and moist ground, dense pipelines and plant stations, measurement can be finished by cooperation of multiple persons, labor input and workload are greatly increased, errors are easily caused by influence of multiple factors, on one hand, the skill level of the person is different from the operation standardization, the judgment standard of the reserved length is not uniform, on the other hand, the reading deviation is easily caused by dim light, the tool stability is interfered by strong electromagnetic environment, and finally the problems of shearing errors and shearing missing frequently occur. The method not only causes direct waste of raw materials such as high-specification power cables, but also can disturb the whole construction plan due to reworking and material supplementing, and seriously slow down project progress. Therefore, a tool for facilitating rapid cable length measurement is needed to reduce workload, improve working efficiency and reduce material waste. Disclosure of Invention The invention aims to provide a cable length tester for power grid construction, which aims to solve the problems that the existing cable length measuring technology is large in workload and low in working efficiency, and the construction progress is influenced due to material waste caused by error easily. In order to achieve the above purpose, the invention adopts the following technical scheme: A cable length tester for power grid construction, comprising: A housing; At least two cable access terminals for connecting the cable to be tested; The measurement control unit is arranged in the shell and is configured to measure capacitance parameters and/or resistance parameters of the cable to be measured through the cable access end, and the length measurement value of the cable to be measured is calculated and determined based on the capacitance parameters and/or the resistance parameters; the display unit is connected with the measurement control unit and used for displaying measurement results; And the power supply unit is used for supplying power to the cable length tester. Further, the measurement control unit is configured to: Measuring capacitance parameters and resistance parameters of the cable to be tested through the cable access terminal; Based on a capacitance value and a resistance value of a unit length of a cable with a preset standard length, calculating to obtain a first length value and a second length value according to the capacitance parameter and the resistance parameter respectively; and calculating and determining the length measurement value of the cable to be measured according to the first length value and the second length value. Further, the length measurement value of the cable to be measured is determined by an average value of the first length value and the second length value. Further, the display unit is configured as a touch screen, and the measurement control unit is further configured to measure and store the capacitance value per unit length and the resistance value per unit length using a standard cable of a known length based on a calibration instruction input from the touch screen by a user before performing the length measurement; Or the display unit is configured as a display screen and an operation panel, and the measurement control unit is further configured to measure and store the capacitance value per unit length and the resistance value per unit length using a standard cable of a known length based on a calibration instruction input from the operation panel by a user before performing the length measurement. Further, the measurement control unit is specifically configured to perform the following operations to obtain the capacitance parameter: And respectively connecting the at least two cable access ends to two ends of the cabl