CN109521335A - It is a kind of to take the high-voltage cable insulating state on-line detecting system that powered based on self-induction - Google Patents

It is a kind of to take the high-voltage cable insulating state on-line detecting system that powered based on self-induction Download PDF

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Publication number
CN109521335A
CN109521335A CN201811366925.2A CN201811366925A CN109521335A CN 109521335 A CN109521335 A CN 109521335A CN 201811366925 A CN201811366925 A CN 201811366925A CN 109521335 A CN109521335 A CN 109521335A
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China
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unit
cable
alarm
current
voltage
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Inventor
周红军
陈文�
胥峥
王鑫
吴楠
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Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
State Grid Corp of China SGCC
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Yancheng Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
State Grid Corp of China SGCC
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Priority to CN201811366925.2A priority Critical patent/CN109521335A/en
Publication of CN109521335A publication Critical patent/CN109521335A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

本发明提供了一种基于自感应取能供电的高压电缆绝缘状态在线检测系统，所述绝缘状态在线检测系统包括信号采集单元、信号调理单元、A/D转换单元、取能供电单元、中央控制处理单元、通信单元、按键单元、存储单元、显示单元、报警单元和监控中心；所述绝缘状态在线检测系统通过所述取能供电单元从所述被测电缆获取电能，通过对采集的信号进行分析计算，判断所述被测电缆工作状态。本发明提供一种基于自感应取能供电的高压电缆绝缘状态在线检测系统，采用现场自感应取能的方式获取检测系统现场所需电能，提高检测系统安全可靠性。

The present invention provides an online detection system based on the self -sensing high -voltage cable insulation status of the insulation state that can supply power. The online detection system of insulation status includes signal acquisition unit, signal conditioning unit, A/D conversion unit, power supply unit, central control control, central control Processing unit, communication unit, key unit, storage unit, display unit, alarm unit, and monitoring center; the insulation status online detection system obtains electrical energy from the tested cable through the obtained power supply unit, by conducting the collected signal to perform the collected signals Analyze the calculation and judge the working status of the cable measured. The present invention provides an online detection system based on the self -induction of high -voltage cable insulation status that can be used for power supply. It adopts the on -site self -induction energy method to obtain the power required by the detection system to improve the safety and reliability of the detection system.

Description

It is a kind of to take the high-voltage cable insulating state on-line detecting system that powered based on self-induction
Technical field
It is the invention belongs to technical field of electric power detection, in particular to a kind of to take the high-tension cable that powered exhausted based on self-induction Edge state on-line detecting system.
Background technique
With the continuous development of China's economy, demand of the people to electric energy is increasing, and society's entirety electricity consumption is continuous Rising.The rising of social entirety electricity consumption will lead to the increase of the pressure of national transmission line of electricity.In city, since soil provides Source is more and more in short supply, overhead transmission line can constitute potential threat and mixed and disorderly overhead transmission line to the appearance of the city to the Electrical Safety of citizen City's looks will cause influence, so more and more overhead transmission lines are substituted by buried cable.Cable installation is in underground, difference In overhead transmission line, it is easy to by the corrosion of destruction and environment from external force, and then lead to cable failure, insulation performance drop It is low.The quality of cable insulation is to influence the key factor of cable safe and reliable operation, needs to pay much attention to.
Power cable insulation state changes the variation that will lead to grounding circulation, is obtained by the situation of change of monitoring grounding circulation It, being capable of real-time detection failure to the state of insulation of cable, it is ensured that the safe and stable operation of power cable reduces inspection workload, And it can take timely measure and reduce grounding circulation harm caused by cable.Since cable laying route is longer, scene letter The equipment power supplies such as number acquisition, processing are unstable, thus it is existing using live self-induction take can by the way of obtain detection system and show Place needs electric energy, can be improved detection system security reliability.
Summary of the invention
The present invention provides a kind of high-voltage cable insulating state on-line detecting system that takes and can power based on self-induction, using existing Electric energy needed for field self-induction takes the mode of energy to obtain detection system scene, improves detection system security reliability.
The present invention is specially a kind of high-voltage cable insulating state on-line detecting system that is taken and can be powered based on self-induction, described State of insulation on-line detecting system include signal acquisition unit, signal conditioning unit, A/D converting unit, take can power supply unit, in Centre control processing unit, communication unit, push-button unit, storage unit, display unit, alarm unit and monitoring center, the letter Number acquisition unit and the signal conditioning unit, the A/D converting unit, the central control processing unit, the communication unit First, described monitoring center is linked in sequence, it is described take can power supply unit respectively with the signal acquisition unit and the signal condition Unit, the A/D converting unit, the central control processing unit, the communication unit, the push-button unit, the storage Unit, the display unit, the alarm unit are connected, the central control processing unit also respectively with the key list First, the described storage unit, the display unit, the alarm unit are connected；The state of insulation on-line detecting system passes through It is described take can power supply unit from the tested cable obtain electric energy, by carrying out analytical calculation to the signal of acquisition, described in judgement Tested cable work state.
The signal acquisition unit is socketed on tested cable using Rogowski coil current sensor to cable loop current Signal is acquired, the low voltage signal of output and the directly proportional relationship of the loop current；Using the first temperature sensing Device acquires the temperature of the tested cable, using second temperature sensor collection site environment temperature.
The signal conditioning unit includes integrating circuit, amplifying circuit and the first filter circuit, and the integrating circuit uses Active analog integration method, including operational amplifier, first resistor device, second resistor and capacitor, when the signal of input passes through When the first resistor device is transmitted to again on the capacitor, it is equal to the capacitor and charges, the voltage on the capacitor The output voltage of the as described integrating circuit, the output voltage and the directly proportional relationship of the loop current；Described first Filter circuit can control the frequency of voltage signal within 50Hz working frequency, and filtration frequencies are greater than the signal of 50Hz, subtract Noise jamming caused by small high-frequency signal.
It is described take can power supply unit include taking energy coil, protection location, rectification circuit, the second filter circuit, battery, lead to It crosses the taking energy coil and obtains alternating voltage from the tested cable, by the protection location, the rectification circuit, described the The DC voltage of two filter circuit pressure stabilizing output smoothings carries out power storage or output using the battery；
The taking energy coil uses Open Type Electric Current Mutual Inductor；The protection location uses transient supression diode, prevents It is described that energy power supply unit is taken to induce very high surge voltage when the circuit-under-test breaks down, cause danger；The storage Battery used lithium battery.
The key-press input unit carries out parameter setting, the parameter packet in conjunction with the storage unit, the display unit Include electric current early warning value, electric current overload alarm value, current changing rate alarming value, cable temperature alarming value, environment temperature alarming value and Temperature rise alarming value, the electric current early warning value are less than the electric current overload alarm value；The key-press input unit is in conjunction with the storage Unit, the display unit can also help patrolman's progress field data to check.
The central control processing unit analyzes and determines the signal of input, by the electric current of real-time measurement and the electricity Stream early warning value and the electric current overload alarm value compare: if the result of the real-time measurement is less than the electric current early warning value, institute It is good to state tested cable insulation status；If the result of the real-time measurement is greater than the electric current early warning value, it is super to be less than the electric current Limiting alarming value, then the tested cable insulation status is deteriorated, state of insulation variation alarm signal is issued by the alarm unit, And failure report is issued to the monitoring center by the communication unit；If the result of the real-time measurement is greater than the electric current Overload alarm value, then insulation fault occurs for the tested cable, issues insulation fault alarm signal by the alarm unit, and Failure report is issued to the monitoring center by the communication unit；
The central control processing unit calculates the curent change trend, and compared with the current changing rate alarming value Compared with passing through the alarm unit and issue cable insulation status anomalous variation alarm signal if more than the current changing rate alarming value Number；
The cable temperature of measurement is compared judgement with the cable temperature alarming value by the central control processing unit, If the cable temperature of measurement is greater than the cable temperature alarming value, cable temperature abnormal alarm is issued by the alarm unit； The environment temperature of measurement is compared judgement with the environment temperature alarming value, if the environment temperature of measurement is greater than the environment Temperature alarming value issues environment temperature abnormal alarm by the alarm unit；According to the cable temperature and environment temperature of measurement Temperature rise is calculated, and is compared judgement with the temperature rise alarming value, it is single by the alarm if more than the temperature rise alarming value Member issues temperaturing lifting abnormality alarm；
The central control processing unit in conjunction with the storage unit carry out integral point data record, and formed data sheet, History curve, failure report carry out live access by the key-press input unit and the display unit, pass through the communication Unit is uploaded to the monitoring center.
Relevant information is transmitted to the monitoring center using the GPRS communication technology by the communication unit, helps monitoring personnel Long-range monitoring effective in real time is carried out to the tested cable, it can be timely when the tested cable insulation status is abnormal It takes appropriate measures；The monitoring center uses the gsm wireless communication technology by the data sheet, the history curve, institute It states failure report and is sent to associated mobile device, the associated mobile device is held by relevant staff.
Detailed description of the invention
Fig. 1 is a kind of structure that the high-voltage cable insulating state on-line detecting system that can be powered is taken based on self-induction of the present invention Schematic diagram.
Fig. 2 is a kind of integrating circuit knot that the high-voltage cable insulating state on-line detecting system that can be powered is taken based on self-induction Structure schematic diagram.
Fig. 3 takes taking for the high-voltage cable insulating state on-line detecting system that can be powered that can power singly to be a kind of based on self-induction Meta structure schematic diagram.
Specific embodiment
It is a kind of to the present invention with reference to the accompanying drawing that the high-voltage cable insulating state on-line checking that can be powered is taken based on self-induction The specific embodiment of system elaborates.
As shown in Figure 1, state of insulation on-line detecting system includes signal acquisition unit, signal conditioning unit, A/D conversion list Member takes energy power supply unit, central control processing unit, communication unit, push-button unit, storage unit, display unit, alarm unit And monitoring center, the signal acquisition unit and the signal conditioning unit, the A/D converting unit, at the central control Manage unit, the communication unit, the monitoring center be linked in sequence, it is described take can power supply unit respectively with the signal acquisition list It is first with the signal conditioning unit, the A/D converting unit, the central control processing unit, the communication unit, described press Key unit, the storage unit, the display unit, the alarm unit are connected, and the central control processing unit also divides It is not connected with the push-button unit, the storage unit, the display unit, the alarm unit；The state of insulation exists Line detection system takes energy power supply unit to obtain electric energy from the tested cable by described, by analyzing the signal of acquisition It calculates, judges the tested cable work state.
The signal acquisition unit is socketed on tested cable using Rogowski coil current sensor to cable loop current Signal is acquired, the low voltage signal of output and the directly proportional relationship of the loop current；Using the first temperature sensing Device acquires the temperature of the tested cable, using second temperature sensor collection site environment temperature.
The signal conditioning unit includes integrating circuit, amplifying circuit and the first filter circuit；As shown in Fig. 2, the product Parallel circuit uses active analog integration method, including operational amplifier 1, first resistor device 2, second resistor 3 and capacitor 4, when When the signal of input is transmitted on the capacitor 4 again by the first resistor device 2, it is equal to the capacitor 4 and charges, institute State the output voltage that the voltage on capacitor 4 is the integrating circuit, the output voltage and the loop current directly at Proportionate relationship；The frequency of voltage signal can be controlled the filtration frequencies within 50Hz working frequency by first filter circuit Signal greater than 50Hz reduces noise jamming caused by high-frequency signal.
As shown in figure 3, it is described take can power supply unit include taking energy coil, protection location, rectification circuit, the second filtered electrical Road, battery obtain alternating voltage from the tested cable by the taking energy coil, by the protection location, described whole The DC voltage of current circuit, the second filter circuit pressure stabilizing output smoothing, using the battery carry out power storage or Output；
The taking energy coil uses Open Type Electric Current Mutual Inductor；The protection location uses transient supression diode, prevents It is described that energy power supply unit is taken to induce very high surge voltage when the circuit-under-test breaks down, cause danger；The storage Battery used lithium battery.
The key-press input unit carries out parameter setting, the parameter packet in conjunction with the storage unit, the display unit Include electric current early warning value, electric current overload alarm value, current changing rate alarming value, cable temperature alarming value, environment temperature alarming value and Temperature rise alarming value, the electric current early warning value are less than the electric current overload alarm value；The key-press input unit is in conjunction with the storage Unit, the display unit can also help patrolman's progress field data to check.
The central control processing unit analyzes and determines the signal of input, by the electric current of real-time measurement and the electricity Stream early warning value and the electric current overload alarm value compare: if the result of the real-time measurement is less than the electric current early warning value, institute It is good to state tested cable insulation status；If the result of the real-time measurement is greater than the electric current early warning value, it is super to be less than the electric current Limiting alarming value, then the tested cable insulation status is deteriorated, state of insulation variation alarm signal is issued by the alarm unit, And failure report is issued to the monitoring center by the communication unit；If the result of the real-time measurement is greater than the electric current Overload alarm value, then insulation fault occurs for the tested cable, issues insulation fault alarm signal by the alarm unit, and Failure report is issued to the monitoring center by the communication unit；
The central control processing unit calculates the curent change trend, and compared with the current changing rate alarming value Compared with passing through the alarm unit and issue cable insulation status anomalous variation alarm signal if more than the current changing rate alarming value Number；
The cable temperature of measurement is compared judgement with the cable temperature alarming value by the central control processing unit, If the cable temperature of measurement is greater than the cable temperature alarming value, cable temperature abnormal alarm is issued by the alarm unit； The environment temperature of measurement is compared judgement with the environment temperature alarming value, if the environment temperature of measurement is greater than the environment Temperature alarming value issues environment temperature abnormal alarm by the alarm unit；According to the cable temperature and environment temperature of measurement Temperature rise is calculated, and is compared judgement with the temperature rise alarming value, it is single by the alarm if more than the temperature rise alarming value Member issues temperaturing lifting abnormality alarm；
The central control processing unit in conjunction with the storage unit carry out integral point data record, and formed data sheet, History curve, failure report carry out live access by the key-press input unit and the display unit, pass through the communication Unit is uploaded to the monitoring center.
Relevant information is transmitted to the monitoring center using the GPRS communication technology by the communication unit, helps monitoring personnel Long-range monitoring effective in real time is carried out to the tested cable, it can be timely when the tested cable insulation status is abnormal It takes appropriate measures；The monitoring center uses the gsm wireless communication technology by the data sheet, the history curve, institute It states failure report and is sent to associated mobile device, the associated mobile device is held by relevant staff.
Finally it should be noted that only illustrating technical solution of the present invention rather than its limitations in conjunction with above-described embodiment.Institute The those of ordinary skill in category field is it is to be understood that those skilled in the art can repair a specific embodiment of the invention Change or equivalent replacement, but these modifications or change are being applied among pending claims.

Claims (7)

1.一种基于自感应取能供电的高压电缆绝缘状态在线检测系统，其特征在于，所述绝缘状态在线检测系统包括信号采集单元、信号调理单元、A/D转换单元、取能供电单元、中央控制处理单元、通信单元、按键单元、存储单元、显示单元、报警单元和监控中心，所述信号采集单元与所述信号调理单元、所述A/D转换单元、所述中央控制处理单元、所述通信单元、所述监控中心顺序连接，所述取能供电单元分别与所述信号采集单元与所述信号调理单元、所述A/D转换单元、所述中央控制处理单元、所述通信单元、所述按键单元、所述存储单元、所述显示单元、所述报警单元相连接，所述中央控制处理单元还分别与所述按键单元、所述存储单元、所述显示单元、所述报警单元相连接；所述绝缘状态在线检测系统通过所述取能供电单元从被测电缆获取电能，通过对采集的信号进行分析计算，判断所述被测电缆工作状态。1. A high-voltage cable insulation state on-line detection system based on self-induction power supply, characterized in that, the insulation state on-line detection system includes a signal acquisition unit, a signal conditioning unit, an A/D conversion unit, an energy-taking power supply unit, Central control processing unit, communication unit, key unit, storage unit, display unit, alarm unit and monitoring center, the signal acquisition unit and the signal conditioning unit, the A/D conversion unit, the central control processing unit, The communication unit and the monitoring center are sequentially connected, and the energy-taking power supply unit is respectively connected with the signal acquisition unit, the signal conditioning unit, the A/D conversion unit, the central control processing unit, and the communication unit. unit, the key unit, the storage unit, the display unit, and the alarm unit, and the central control processing unit is also connected with the key unit, the storage unit, the display unit, the The alarm unit is connected; the insulation state online detection system obtains electric energy from the cable under test through the energy-taking power supply unit, and judges the working state of the cable under test by analyzing and calculating the collected signal. 2.根据权利要求1所述的一种基于自感应取能供电的高压电缆绝缘状态在线检测系统，其特征在于，所述信号采集单元采用罗氏线圈电流传感器套接在被测电缆上对电缆环流电流信号进行采集，输出与所述环流电流直接成比例关系的低压电压信号；采用第一温度传感器采集所述被测电缆的温度，采用第二温度传感器采集现场环境温度。2. A high-voltage cable insulation state online detection system based on self-induction energy harvesting and power supply according to claim 1, wherein the signal acquisition unit uses a Rogowski coil current sensor to be socketed on the cable under test to control the cable circulation The current signal is collected, and a low-voltage voltage signal directly proportional to the circulating current is output; the first temperature sensor is used to collect the temperature of the cable under test, and the second temperature sensor is used to collect the on-site ambient temperature. 3.根据权利要求2所述的一种基于自感应取能供电的高压电缆绝缘状态在线检测系统，其特征在于，所述信号调理单元包括积分电路、放大电路和第一滤波电路，所述积分电路采用有源模拟积分法，包括运算放大器、第一电阻器、第二电阻器和电容器，当输入的信号通过所述第一电阻器再传递到所述电容器上时，等于向所述电容器充电，所述电容器上的电压即为所述积分电路的输出电压，所述输出电压与所述环流电流直接成比例关系；所述第一滤波电路能够将电压信号的频率控制在50Hz工作频率以内，过滤频率大于50Hz的信号，减小高频信号造成的噪声干扰。3. An online detection system based on the insulation state of high -voltage cables that can be powered by self -induction based on claim 2, which is characterized by the signal conditioning unit The circuit adopts the active simulation points, including the operational amplifier, the first resistor, the second resistor, and the capacitor. When the input signal is passed on the container through the first resistor, it is equivalent to charging the capacitor The voltage on the capacitor is the output voltage of the integral circuit, which is directly proportional to the circular current of the output voltage; Signals with a frequency of filtration are greater than 50Hz, reducing noise interference caused by high -frequency signals. 4.根据权利要求3所述的一种基于自感应取能供电的高压电缆绝缘状态在线检测系统，其特征在于，所述取能供电单元包括取能线圈、保护单元、整流电路、第二滤波电路、蓄电池，通过所述取能线圈从所述被测电缆获取交流电压，经过所述保护单元、所述整流电路、所述第二滤波电路稳压输出平滑的直流电压，再经过所述蓄电池进行电能存储或输出；4. An online detection system based on the self -induction of high -voltage cable insulation status based on the self -induction of power supply can be used. Circuit and batteries, through the obtaining capacity of the tested cable, obtained the AC voltage from the measured cable, passed the smooth DC voltage of the protection unit, the rectification circuit, and the second filter circuit. Perform electric energy storage or output; 所述取能线圈采用开启式电流互感器；所述保护单元采用瞬变抑制二极管，防止当所述被测电路发生故障时，所述取能供电单元感应出很高的冲击电压，造成危险；所述蓄电池采用过锂电池。The energy harvesting coil adopts an open current transformer; the protection unit adopts a transient suppression diode to prevent the energy harvesting power supply unit from inducing a very high impulse voltage when the circuit under test breaks down, causing danger; The battery has been lithium batteries. 5.根据权利要求4所述的一种基于自感应取能供电的高压电缆绝缘状态在线检测系统，其特征在于，所述按键输入单元结合所述存储单元、所述显示单元进行参数设定，所述参数包括电流预警值、电流超限报警值、电流变化率报警值、电缆温度报警值、环境温度报警值和温升报警值，所述电流预警值小于所述电流超限报警值；所述按键输入单元结合所述存储单元、所述显示单元还能够帮助巡查人员进行现场数据查看。5. A kind of high-voltage cable insulation status online detection system based on self-induction energy harvesting and power supply according to claim 4, characterized in that, the key input unit combines the storage unit and the display unit for parameter setting, The parameters include current warning value, current over-limit alarm value, current rate of change alarm value, cable temperature alarm value, ambient temperature alarm value and temperature rise alarm value, and the current early-warning value is less than the current over-limit alarm value; The key input unit of the key can help inspectors to conduct on -site data viewing combined with the storage unit and the display unit. 6.根据权利要求5所述的一种基于自感应取能供电的高压电缆绝缘状态在线检测系统，其特征在于，所述中央控制处理单元对输入的信号进行分析判断，将实时测量的电流与所述电流预警值和所述电流超限报警值比较：若所述实时测量的结果小于所述电流预警值，则所述被测电缆绝缘状态良好；若所述实时测量的结果大于所述电流预警值，小于所述电流超限报警值，则所述被测电缆绝缘状态变差，通过所述报警单元发出绝缘状态变差报警信号，并通过所述通信单元向所述监控中心发出故障报表；若所述实时测量的结果大于所述电流超限报警值，则所述被测电缆发生绝缘故障，通过所述报警单元发出绝缘故障报警信号，并通过所述通信单元向所述监控中心发出故障报表；6. A kind of high-voltage cable insulation state online detection system based on self-induction energy harvesting power supply according to claim 5, characterized in that, the central control processing unit analyzes and judges the input signal, and compares the current measured in real time with the The current warning value is compared with the current over-limit warning value: if the real-time measurement result is less than the current warning value, the insulation state of the tested cable is good; if the real-time measurement result is greater than the current If the warning value is less than the current over-limit alarm value, the insulation state of the cable under test will deteriorate, and an alarm signal of insulation state deterioration will be sent through the alarm unit, and a fault report will be sent to the monitoring center through the communication unit ; If the result of the real-time measurement is greater than the current over-limit alarm value, an insulation fault occurs in the cable under test, an insulation fault alarm signal is sent through the alarm unit, and an alarm signal is sent to the monitoring center through the communication unit Failure report; 所述中央控制处理单元计算所述电流变化趋势，并与所述电流变化率报警值相比较，若大于所述电流变化率报警值，通过所述报警单元发出电缆绝缘状态异常变化报警信号；The central control processing unit calculates the current change trend and compares it with the current change rate alarm value, and if it is greater than the current change rate alarm value, an alarm signal for abnormal change of the cable insulation state is sent by the alarm unit; 所述中央控制处理单元将测量的电缆温度与所述电缆温度报警值进行比较判断，若测量的电缆温度大于所述电缆温度报警值，通过所述报警单元发出电缆温度异常报警；将测量的环境温度与所述环境温度报警值进行比较判断，若测量的环境温度大于所述环境温度报警值，通过所述报警单元发出环境温度异常报警；根据测量的电缆温度和环境温度计算出温升，并与所述温升报警值进行比较判断，若大于所述温升报警值，通过所述报警单元发出温升异常报警；The central control processing unit compares the measured cable temperature with the cable temperature alarm value, and if the measured cable temperature is greater than the cable temperature alarm value, an abnormal cable temperature alarm is issued by the alarm unit; the measured environment Temperature is compared and judged with the ambient temperature alarm value, if the measured ambient temperature is greater than the ambient temperature alarm value, an abnormal ambient temperature alarm is sent through the alarm unit; the temperature rise is calculated according to the measured cable temperature and ambient temperature, and compared with the The comparison of the warning values of the temperature rise is better than the alarm value of the warming alarm. 所述中央控制处理单元结合所述存储单元进行整点数据记录，并形成数据报表、历史曲线、故障报表，通过所述按键输入单元和所述显示单元进行现场查阅，通过所述通信单元上传至所述监控中心。The central control processing unit combines the storage unit to record the whole point data, and forms data reports, historical curves, and fault reports, which are checked on-site through the key input unit and the display unit, and uploaded to The monitoring center. 7.根据权利要求6所述的一种基于自感应取能供电的高压电缆绝缘状态在线检测系统，其特征在于，所述通信单元采用GPRS通信技术将相关信息传输至所述监控中心，帮助监控人员对所述被测电缆实行实时有效的远程监控，当所述被测电缆绝缘状态发生异常时能够及时采取相应的措施；所述监控中心采用GSM无线通信技术将所述数据报表、所述历史曲线、所述故障报表发送到相关联的移动设备，所述相关联的移动设备为相关工作人员所持有。7. A high-voltage cable insulation state online detection system based on self-induction energy harvesting and power supply according to claim 6, wherein the communication unit uses GPRS communication technology to transmit relevant information to the monitoring center to help monitor The personnel carry out real-time and effective remote monitoring on the cable under test, and can take corresponding measures in time when the insulation state of the cable under test is abnormal; The curve and the fault report are sent to the related mobile devices, which are held by relevant staff.
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