CN112857622A - Temperature-sensitive cable performance detection device and method based on temperature resistance characteristic - Google Patents

Temperature-sensitive cable performance detection device and method based on temperature resistance characteristic Download PDF

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CN112857622A
CN112857622A CN202110095890.9A CN202110095890A CN112857622A CN 112857622 A CN112857622 A CN 112857622A CN 202110095890 A CN202110095890 A CN 202110095890A CN 112857622 A CN112857622 A CN 112857622A
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temperature
sensing cable
curve
resistance
temperature sensing
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CN112857622B (en
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谭风雷
张兆君
李义峰
朱超
曹勇
臧泽洲
赵宏飞
徐刚
吴兴泉
陈昊
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Maintenance Branch of State Grid Jiangsu Electric Power Co Ltd
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Abstract

The invention discloses a temperature-sensing cable performance detection device and method based on temperature-resistance characteristics, the device mainly comprises 3 parts of a main control system, a temperature control system and a detection structure, wherein the main control unit controls the temperature control system to heat the ambient temperature of a temperature-sensing cable to a target value, the detection structure monitors the ambient temperature of the temperature-sensing cable and the resistance value of the cable, a temperature-resistance characteristic curve is fitted through the resistance values of the cables at different temperatures, and the performance of the temperature-sensing cable is judged by utilizing the curve deviation rate, the number of large deviation points and the maximum change rate. The invention can set different cable heating modes according to different cable arrangement environments on site, conveniently evaluate the performance of the temperature sensing cable on site, and effectively prevent the damaged or low-quality temperature sensing cable from being used on site.

Description

Temperature-sensitive cable performance detection device and method based on temperature resistance characteristic
Technical Field
The invention relates to a temperature-sensitive cable performance detection device and method based on temperature resistance characteristics, and belongs to the technical field of transformer state detection.
Background
The temperature sensing cable applied to the electrical equipment in the transformer substation has the problem of mistakenly sending an alarm signal due to the lack of quantitative detection equipment suitable for the site.
Disclosure of Invention
The invention aims to provide a temperature-resistance characteristic-based temperature-sensitive cable performance detection device and method.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a temperature-sensitive cable performance detection device based on temperature resistance characteristics, which comprises: the system comprises a main control system, a temperature control system and a detection structure;
the main control system is used for controlling the temperature control system to heat the ambient temperature of the temperature sensing cable to a target value, fitting a temperature resistance characteristic curve based on the ambient temperature of the temperature sensing cable and the resistance value of the cable, and evaluating the performance of the temperature sensing cable;
the temperature control system is used for heating the temperature sensing cable;
the detection structure is used for monitoring the ambient temperature of the temperature sensing cable and the resistance value of the cable;
the temperature control system is wrapped outside the temperature sensing cable;
the detection structure is arranged on the stable control system;
the temperature control system and the detection structure are communicated with the master control system in a wireless mode.
Furthermore, the master control system comprises a master control unit, a communication module, a voltage and current monitoring module, a temperature resistance curve fitting module, an AD acquisition module and a photoelectric coupling module;
the communication module is used for communication between the main control system and the temperature control system and between the main control system and the detection structure;
the voltage and current monitoring module is used for sampling the voltage and the current of the temperature sensing cable resistance measuring loop;
the AD acquisition module is used for converting the ambient temperature of the temperature sensing cable into an electric signal which can be acquired by the main control unit;
the temperature resistance curve fitting module is used for fitting a temperature resistance characteristic curve according to the resistance and the temperature of the temperature sensing cable;
the main control unit is used for controlling the temperature control system to heat the temperature sensing cable, calculating the resistance of the temperature sensing cable according to the voltage and current electric signals, and judging the performance of the temperature sensing cable according to the temperature resistance characteristic curve;
the photoelectric coupling module is used for isolating input and output signals.
Further, in the above-mentioned case,
for the field non-detachable temperature sensing cable structure, the temperature control system adopts a cylindrical silica gel heating sheet;
for the detachable temperature sensing cable structure, the temperature control system adopts an accommodating type constant temperature bag.
Further, in the above-mentioned case,
the detection structure comprises a temperature sensor and a voltage and current sensor;
the temperature sensor is used for measuring the ambient temperature of the temperature sensing cable;
the voltage and current sensor is used for measuring the voltage and current of the temperature sensing cable resistance measuring loop.
The invention also provides a temperature-sensitive cable performance detection method based on the temperature resistance characteristic, which comprises the following steps:
controlling a temperature control system to heat the temperature sensing cable to a target temperature according to the step length in sequence;
monitoring the ambient temperature and the resistance value of the temperature sensing cable at different target temperatures through the detection structure;
fitting a temperature resistance characteristic standard curve and a measurement curve of the temperature sensing cable according to the resistance values of the temperature sensing cable at different target temperatures;
and evaluating the performance of the temperature sensing cable based on a temperature resistance characteristic standard curve and a measurement curve of the temperature sensing cable.
Further, the fitting of the temperature-resistance characteristic standard curve and the measurement curve of the temperature-sensitive cable according to the resistance values of the temperature-sensitive cable at different target temperatures includes:
the temperature resistance characteristic curve of the temperature sensing cable between the ith measurement point and the (i + 1) th measurement point is expressed as follows:
Figure BDA0002913939370000021
wherein, fx (t)iA temperature-sensitive cable temperature-resistance characteristic measurement curve from the ith measurement point to the (i + 1) th measurement point is shown, one target temperature corresponds to one measurement point, RiMeasuring resistance, R, for the temperature sensing cable of the ith measuring pointi+1Measuring resistance value of the temperature sensing cable at the (i + 1) th measuring point, wherein T represents a target temperature value corresponding to the measuring point, and TGFor temperature separation of adjacent measurement points, NGThe total number of measurement points in the whole temperature range;
sequentially calculating to obtain temperature-resistance characteristic measurement curves of the temperature-sensing cables from all measurement points to adjacent measurement points, and obtaining the temperature-resistance characteristic measurement curve of the temperature-sensing cables in the whole temperature range;
similarly, the temperature resistance characteristic standard curve of the temperature sensing cable in the whole temperature range is obtained by calculating according to the standard resistance values of the temperature sensing cable at different target temperatures.
Further, the temperature range is selected from 20 ℃ to 120 ℃;
the total number of measurement points in the whole temperature range is calculated as:
Figure BDA0002913939370000022
further, the evaluating the performance of the temperature sensing cable based on the temperature resistance characteristic standard curve and the measurement curve comprises:
calculating the deviation rate and curve deviation score of the temperature-sensitive cable temperature-resistance curve, calculating the number of large deviation points of the temperature-sensitive cable temperature-resistance curve and calculating the maximum change rate of the temperature-sensitive cable temperature-resistance curve;
and establishing a temperature sensing cable evaluation system based on the temperature resistance characteristic curve deviation rate, the curve deviation score, the large deviation point number and the maximum change rate of the temperature sensing cable, and dividing the temperature sensing cable into three grades I, II and III according to the performance.
Further, the calculating the deviation rate of the temperature-resistance curve of the temperature-sensitive cable and the curve deviation score includes:
the curve deviation ratio is calculated as follows:
Figure BDA0002913939370000031
wherein e iszRepresenting the deviation ratio of the curve, RMtThe actual resistance value of the temperature sensing cable is obtained by a standard resistance measuring instrument when the target temperature is tTtThe resistance value R of the temperature sensing cable is measured when the target temperature is tCtC represents the standard resistance value of the temperature sensing cable when the target temperature is t, and c represents the temperature change quantity;
the curve deviation score is calculated as follows:
P＝∑Pt
Figure BDA0002913939370000032
Figure BDA0002913939370000033
wherein P represents the total curve deviation score of the temperature sensing cable, PtRepresents a curve deviation score when the target temperature of the temperature sensing cable is t, c1t、c2tTemperature indicationCoefficient of deviation score for cable temperature t, etThe resistance deviation ratio at temperature t is shown.
Further, the calculating the number of large deviation points of the temperature resistance curve of the temperature sensing cable includes:
when e istGreater than EmaxThe corresponding measuring point is a large deviation point, and the number N, E of the large deviation points is calculatedmaxIndicating a resistance deviation ratio preset threshold.
Further, the calculating the maximum rate of change of the temperature resistance curve of the temperature sensing cable includes:
Mmax＝max||RT(t+1)-RTt|-|RC(t+1)-RCt||
wherein M ismaxAnd the maximum change rate of the temperature resistance characteristic standard curve and the measurement curve of the temperature sensing cable is represented.
Further, the temperature sensing cable evaluation system is established based on the deviation rate of the temperature resistance characteristic curve of the temperature sensing cable, the number of large deviation points and the maximum change rate, and the temperature sensing cable is divided into three grades I, II and III according to the performance, including:
the performance of the temperature sensing cable is an evaluation standard of I grade: rate of curve deviation ezLess than 5 or P > 80, and a maximum rate of change MmaxLess than 1 and no large deviation point;
the evaluation standard of the temperature sensing cable performance of level II is that the temperature sensing cable meets any condition as follows:
condition 1: rate of curve deviation ezLess than 5 or P > 80, and a maximum rate of change MmaxGreater than 1, but no large deviation point exists;
condition 2: rate of curve deviation ezMore than 5 or 60-80, and the maximum rate of change MmaxLess than 1, and the number N of large deviation points is less than or equal to 10;
the performance of the temperature sensing cable is the evaluation standard of grade III: rate of curve deviation ezGreater than 5 or P < 60, and maximum rate of change MmaxGreater than 1 and the number of large deviation points N is greater than 10.
The invention has the beneficial effects that:
the invention provides a temperature-sensitive cable performance detection device and method based on temperature-resistance characteristics. Has the following advantages: 1. the device can be applied to the quantitative detection of the temperature resistance characteristic of the temperature sensing cable. 2. The device can judge the performance level of the temperature sensing cable, can effectively prevent the damaged or low-quality temperature sensing cable from being used on site, and improves the reliability of a fire-fighting system of a transformer substation.
Drawings
Fig. 1 is a structural view of a temperature-sensitive cable detection device according to the present invention.
FIG. 2 is a flow chart of the detection of the temperature-sensitive cable according to the present invention.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The invention provides a temperature-sensitive cable performance detection device based on temperature resistance characteristics, which comprises 3 parts of a main control system, a temperature control system and a detection structure, as shown in figure 1.
The master control system is communicated with the temperature control system in a wireless mode.
The main control system is used for controlling the temperature control system, heating the ambient temperature of the temperature sensing cable to a target value, fitting a temperature resistance characteristic curve based on the ambient temperature of the temperature sensing cable and the resistance value of the cable, and evaluating the performance of the temperature sensing cable.
The temperature control system is used for heating the temperature sensing cable.
The detection structure is used for monitoring the ambient temperature of the temperature sensing cable and the resistance value of the cable.
Specifically, the main control system mainly comprises 6 parts of a main control unit, a communication module, a voltage and current monitoring module, a temperature resistance curve fitting module, an AD acquisition module and a photoelectric coupling module.
The communication module is used for communication between the main control system and the temperature control system and between the main control system and the detection structure.
The voltage and current monitoring module is used for sampling the voltage and the current of the temperature sensing cable resistance measuring loop;
the AD acquisition module is used for converting the temperature of the cylindrical silica gel heating sheet or the accommodating type constant temperature bag into an electric signal which can be acquired by the main control unit;
the temperature resistance curve fitting module is used for fitting a temperature resistance characteristic curve according to the resistance and the temperature of the temperature sensing cable;
the main control unit is used for calculating the resistance of the temperature sensing cable according to the voltage and current electric signals and judging the performance of the temperature sensing cable according to a temperature resistance characteristic curve;
the photoelectric coupling module is used for isolating input and output signals and realizing accurate control of temperature.
Specifically, for a field non-detachable structure, the temperature control system adopts a cylindrical silica gel heating sheet; to the structure that can conveniently dismantle, temperature control system adopts and holds the type constant temperature bag, can once only put into temperature sensing cable is whole, realizes temperature sensing cable constant temperature heating.
Specifically, detect the structural installation on temperature control system, detect the structure and adopt temperature sensor and voltage, current sensor, carry out temperature monitoring through temperature sensor, carry out resistance monitoring through voltage and current sensor.
The invention also provides a temperature-sensitive cable performance detection method based on temperature resistance characteristics, as shown in fig. 2, comprising:
heating the temperature sensing cable to a target value;
the ambient temperature and the resistance value of the temperature sensing cable are monitored in real time through the detection structure;
fitting a temperature resistance characteristic measurement curve of the temperature sensing cable according to the resistance values of the temperature sensing cable at different temperatures, and displaying the temperature resistance characteristic measurement curve on a screen of the detection device;
and evaluating the performance of the temperature sensing cable based on a temperature resistance characteristic standard curve and a measurement curve of the temperature sensing cable.
Specifically, the temperature-resistance characteristic measurement curve fitting method of the temperature-sensing cable comprises the following steps:
setting the temperature interval of the measuring point of the temperature sensing cable performance detection device as TGThen the total number of measurement points NGCan represent that:
Figure BDA0002913939370000051
in the embodiment of the invention, each target value corresponds to one measuring point, and the measuring range is 20-120 ℃.
Let the temperature sensing cable of the ith measuring point measure the resistance value as RiThe resistance value of the temperature sensing cable of the (i + 1) th measuring point is Ri+1Then, the temperature-resistance characteristic curve of the temperature-sensing cable between the ith measurement point and the (i + 1) th measurement point can be represented as follows:
Figure BDA0002913939370000061
in the formula, fx (t)iAnd (3) a temperature-resistance characteristic measurement curve of the temperature-sensing cable between the ith measurement point and the (i + 1) th measurement point is represented, and t represents a target temperature value corresponding to the measurement point.
And sequentially calculating to obtain temperature resistance characteristic curves of the temperature sensing cables from all the measuring points to adjacent measuring points, and obtaining the temperature resistance characteristic measuring curve of the temperature sensing cables in the whole temperature range.
Similarly, a temperature resistance characteristic standard curve of the temperature sensing cable can be obtained according to the standard resistance value of the temperature sensing cable at different temperatures.
Specifically, the method for evaluating the performance of the temperature sensing cable by adopting the temperature resistance characteristic standard curve and the measurement curve of the temperature sensing cable comprises the following steps:
step 1: calculating the deviation rate of the temperature resistance curve of the temperature sensing cable and the curve deviation score,
according to the temperature resistance characteristic standard curve and the temperature resistance characteristic measurement curve of the temperature sensing cable, firstly, the deviation ratio of the two temperature resistance characteristic curves is calculated as follows:
Figure BDA0002913939370000062
in the formula, ezRepresenting the deviation ratio of the curve, RMtThe actual resistance value of the temperature sensing cable is obtained by a standard resistance measuring instrument when the target temperature is tTtThe resistance value of the temperature sensing cable is measured when the target temperature is t, and R is obtained by measurement of the deviceCtThe standard resistance value of the temperature sensing cable at the target temperature t is obtained from the factory test result of a temperature sensing cable manufacturer, and c represents the temperature change quantity.
Calculating the deviation ratio of the standard resistance value and the measured resistance value of the temperature sensing cable at a certain temperature, wherein the expression is as follows:
Figure BDA0002913939370000063
in the formula, etThe resistance deviation ratio at temperature t is shown.
Defining the temperature of the temperature sensing cable as t time deviation score, and the calculation formula is as follows:
Figure BDA0002913939370000064
in the formula, c1t、c2tA deviation score coefficient P representing the temperature of the temperature sensing cable as ttThe performance deviation score when the temperature of the temperature sensing cable is t is shown. c. C1tAnd c2tIs set artificially, c1tCan be selected from 15% to 30%, c2tThe value can be 30-45%.
Calculating performance deviation scores of t at 10 times of 20 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃, 120 ℃ and the like respectively to obtain deviation total scores of the temperature sensing cables:
P＝∑Pt (6)
in the formula, P represents a total curve deviation score of the temperature-sensitive cable.
Step 2: and calculating the number of large deviation points of the temperature resistance curve of the temperature sensing cable.
Definition when etGreater than EmaxFor large deviation points, the number of large deviation points N is calculated.
Wherein E ismaxIndicating a resistance deviation ratio preset threshold.
And step 3: and calculating the maximum change rate of the temperature resistance curve of the temperature sensing cable.
According to the temperature resistance characteristic standard curve and the measurement curve of the temperature sensing cable, the maximum change value of the temperature resistance characteristic curve with 1 ℃ as the minimum unit is calculated, and the calculation method is as follows:
Mmax＝max||RT(t+1)-RTt|-|RC(t+1)-RCt|| (7)
in the formula, MmaxAnd the maximum change rate of the temperature resistance characteristic standard curve and the measurement curve of the temperature sensing cable is represented.
And 4, step 4: and establishing an evaluation system of the temperature sensing cable.
The method adopts a temperature sensing cable evaluation system which takes the deviation rate of a temperature resistance characteristic curve of the temperature sensing cable as a basis and takes the large deviation point quantity and the maximum change rate as auxiliary criteria, and divides the temperature sensing cable into three grades I, II and III according to the performance, wherein the specific evaluation mode is as follows:
1. the performance of the temperature sensing cable is an evaluation standard of I grade: rate of curve deviation ezLess than 5 or a deviation score greater than 80, maximum rate of change MmaxLess than 1, no large deviation point.
2. The evaluation standard of the temperature sensing cable performance of level II is that the temperature sensing cable meets any condition as follows:
condition 1: rate of curve deviation ezLess than 5 or a deviation score greater than 80, maximum rate of change MmaxGreater than 1, but no large deviation point exists.
Condition 2: rate of curve deviation ezGreater than 5 or a deviation score less than 80 but greater than or equal to 60, maximum rate of change MmaxLess than 1, and the number of large deviation points N is less than or equal to 10.
3. The performance of the temperature sensing cable is the evaluation standard of grade III: rate of curve deviation ezGreater than 5 or deviation score less than 60, maximum rate of change MmaxGreater than 1, the number of large deviation points N is greater than 10.
According to the evaluation standard of the temperature sensing cable, the performance is defined as follows:
the I-grade temperature sensing cable has good performance and is suggested to be continuously applied.
The II-grade temperature sensing cable is qualified in performance, can be used or replaced, and can be continuously used if needed, and corresponding parameters of the temperature sensing cable terminal box are required to be adjusted according to field conditions, so that the over-temperature state can be sensitively monitored.
The III-grade temperature sensing cable is unqualified in performance and needs to be replaced in time so as to avoid the situation of false alarm or fire alarm rejection.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (12)

1.一种基于温阻特性的感温电缆性能检测装置，其特征在于，包括：主控系统、温控系统和检测结构；1. a temperature sensing cable performance detection device based on temperature resistance characteristics, is characterized in that, comprises: main control system, temperature control system and detection structure; 所述主控系统用于控制温控系统将感温电缆周围温度加热至目标值，以及，用于基于感温电缆周围温度和电缆阻值拟合温阻特性曲线，以及对感温电缆性能进行评价；The main control system is used for controlling the temperature control system to heat the surrounding temperature of the temperature sensing cable to a target value, and for fitting the temperature resistance characteristic curve based on the surrounding temperature of the temperature sensing cable and the resistance value of the cable, and performing the performance evaluation of the temperature sensing cable. Evaluation; 所述温控系统用于对感温电缆进行加热；The temperature control system is used for heating the temperature sensing cable; 所述检测结构用于监测感温电缆周围温度和电缆阻值；The detection structure is used for monitoring the temperature around the temperature sensing cable and the resistance value of the cable; 所述温控系统包裹于所述感温电缆外部；the temperature control system is wrapped outside the temperature sensing cable; 所述检测结构安装于所述稳控系统上；The detection structure is installed on the stability control system; 所述温控系统和检测结构均通过无线方式与主控系统通信。Both the temperature control system and the detection structure communicate with the main control system wirelessly. 2.根据权利要求1所述的一种基于温阻特性的感温电缆性能检测装置，其特征在于，所述主控系统包括主控单元、通讯模块、电压电流监测模块、温阻曲线拟合模块、AD采集模块和光电耦合模块；2. A temperature sensing cable performance detection device based on temperature resistance characteristics according to claim 1, wherein the main control system comprises a main control unit, a communication module, a voltage and current monitoring module, a temperature resistance curve fitting module, AD acquisition module and photoelectric coupling module; 所述通讯模块用于主控系统与温控系统之间，以及主控系统与检测结构之间进行通信；The communication module is used for communication between the main control system and the temperature control system, and between the main control system and the detection structure; 所述电压电流监测模块用于采样感温电缆电阻测量回路的电压和电流；The voltage and current monitoring module is used for sampling the voltage and current of the temperature sensing cable resistance measurement loop; 所述AD采集模块用于将感温电缆周围温度转化为主控单元可采集的电信号；The AD acquisition module is used to convert the temperature around the temperature sensing cable into an electrical signal that can be collected by the main control unit; 所述温阻曲线拟合模块用于根据感温电缆电阻和温度拟合温阻特性曲线；The temperature-resistance curve fitting module is used for fitting a temperature-resistance characteristic curve according to the temperature-sensing cable resistance and temperature; 所述主控单元用于控制温控系统对感温电缆进行加热，以及用于根据电压和电流电信号计算感温电缆电阻，以及用于根据温阻特性曲线判别感温电缆性能；The main control unit is used for controlling the temperature control system to heat the temperature sensing cable, and for calculating the resistance of the temperature sensing cable according to the voltage and current electrical signals, and for judging the performance of the temperature sensing cable according to the temperature resistance characteristic curve; 所述光电耦合模块用于隔离输入输出信号。The photoelectric coupling module is used for isolating input and output signals. 3.根据权利要求1所述的一种基于温阻特性的感温电缆性能检测装置，其特征在于，3. a kind of temperature sensing cable performance detection device based on temperature resistance characteristic according to claim 1, is characterized in that, 对于现场不可拆卸感温电缆结构，所述温控系统采用圆筒状硅胶加热片；For the non-removable temperature sensing cable structure on site, the temperature control system adopts a cylindrical silicone heating sheet; 对于可拆卸感温电缆结构，所述温控系统采用容纳型恒温袋。For the detachable temperature sensing cable structure, the temperature control system adopts an accommodating thermostatic bag. 4.根据权利要求1所述的一种基于温阻特性的感温电缆性能检测装置，其特征在于，4. a kind of temperature sensing cable performance detection device based on temperature resistance characteristic according to claim 1, is characterized in that, 所述检测结构包括温度传感器和电压、电流传感器；The detection structure includes a temperature sensor and a voltage and current sensor; 所述温度传感器用于测量感温电缆周围温度；The temperature sensor is used to measure the temperature around the temperature sensing cable; 所述电压和电流传感器用于测量感温电缆电阻测量回路的电压和电流。The voltage and current sensors are used to measure the voltage and current of the temperature sensing cable resistance measurement loop. 5.一种基于温阻特性的感温电缆性能检测方法，其特征在于，包括：5. A temperature sensing cable performance detection method based on temperature resistance characteristic, is characterized in that, comprises: 按步长依次控制温控系统将感温电缆加热至目标温度；Control the temperature control system in turn according to the step length to heat the temperature sensing cable to the target temperature; 通过检测结构监测不同目标温度下感温电缆周围温度和阻值；Monitor the surrounding temperature and resistance value of the temperature sensing cable at different target temperatures through the detection structure; 根据不同目标温度下感温电缆阻值拟合感温电缆温阻特性标准曲线和测量曲线；Fit the standard curve and measurement curve of the temperature resistance characteristic of the temperature sensing cable according to the resistance value of the temperature sensing cable at different target temperatures; 基于感温电缆温阻特性标准曲线和测量曲线对感温电缆性能进行评价。Based on the standard curve and measurement curve of the temperature resistance characteristic of the temperature sensing cable, the performance of the temperature sensing cable is evaluated. 6.根据权利要求5所述的一种基于温阻特性的感温电缆性能检测方法，其特征在于，所述根据不同目标温度下感温电缆阻值拟合感温电缆温阻特性标准曲线和测量曲线，包括：6. a kind of temperature-sensing cable performance detection method based on temperature resistance characteristic according to claim 5, is characterized in that, described according to the temperature-sensing cable resistance value fitting temperature-sensing cable temperature-resistance characteristic standard curve and Measurement curves, including: 第i个测量点到第i+1个测量点间感温电缆温阻特性曲线表示为：The temperature resistance characteristic curve of the temperature sensing cable between the i-th measurement point and the i+1-th measurement point is expressed as:
Figure FDA0002913939360000021
Figure FDA0002913939360000021
 其中，fx(t)i表示第i个测量点到第i+1个测量点间感温电缆温阻特性测量曲线，一个目标温度对应一个测量点，Ri为第i个测量点感温电缆测量阻值，Ri+1为第i+1个测量点感温电缆测量阻值，t表示测量点所对应的目标温度值，TG为相邻测量点温度间隔，NG为整个温度范围内测量点总数；Among them, fx(t) i represents the temperature resistance characteristic measurement curve of the temperature-sensing cable between the i-th measurement point and the i+1-th measurement point, one target temperature corresponds to one measurement point, and R i is the i-th measurement point temperature-sensing cable Measure the resistance value, R i+1 is the measured resistance value of the temperature sensing cable at the i+1th measurement point, t represents the target temperature value corresponding to the measurement point, T G is the temperature interval between adjacent measurement points, and N G is the entire temperature range The total number of internal measurement points; 依次计算得到所有测量点到相邻测量点间的感温电缆温阻特性测量曲线，即得到整个温度范围内的感温电缆温阻特性测量曲线；Calculate the temperature resistance characteristic measurement curve of the temperature sensing cable from all the measurement points to the adjacent measurement points in turn, that is, obtain the temperature resistance characteristic measurement curve of the temperature sensing cable in the whole temperature range; 同理，根据不同目标温度下感温电缆的标准阻值计算得到整个温度范围内的感温电缆温阻特性标准曲线。In the same way, according to the standard resistance value of the temperature-sensing cable at different target temperatures, the standard curve of the temperature-resistance characteristic of the temperature-sensing cable in the entire temperature range is obtained. 7.根据权利要求6所述的一种基于温阻特性的感温电缆性能检测方法，其特征在于，所述温度范围选取20℃～120℃；7 . The method for detecting the performance of a temperature-sensing cable based on temperature resistance characteristics according to claim 6 , wherein the temperature range is selected from 20° C. to 120° C.; 8 . 所述整个温度范围内测量点总数计算为：The total number of measurement points over the entire temperature range is calculated as:
Figure FDA0002913939360000022
Figure FDA0002913939360000022
 8.根据权利要求5所述的一种基于温阻特性的感温电缆性能检测方法，其特征在于，所述基于感温电缆温阻特性标准曲线和测量曲线对感温电缆性能进行评价，包括：8. The method for detecting the performance of a temperature-sensing cable based on a temperature-resistance characteristic according to claim 5, wherein the performance of the temperature-sensing cable is evaluated based on a standard curve and a measurement curve of the temperature-sensing cable's temperature-resistance characteristic, comprising: : 计算感温电缆温阻曲线偏差率和曲线偏差得分，计算感温电缆温阻曲线大偏差点数量以及计算感温电缆温阻曲线最大变化率；Calculate the deviation rate and curve deviation score of the temperature-sensing cable temperature resistance curve, calculate the number of large deviation points of the temperature-sensing cable temperature-resistance curve, and calculate the maximum change rate of the temperature-sensing cable temperature-resistance curve; 基于感温电缆温阻特性曲线偏差率，曲线偏差得分，大偏差点数量和最大变化率建立感温电缆评价体系，将感温电缆按性能划分为Ⅰ、Ⅱ和Ⅲ三个等级。Based on the deviation rate of the temperature resistance characteristic curve of the temperature sensing cable, the curve deviation score, the number of large deviation points and the maximum change rate, a temperature sensing cable evaluation system is established, and the temperature sensing cable is divided into three grades: I, II and III according to performance. 9.根据权利要求8所述的一种基于温阻特性的感温电缆性能检测方法，其特征在于，所述计算感温电缆温阻曲线偏差率和曲线偏差得分，包括：9. A temperature-sensing cable performance detection method based on temperature resistance characteristics according to claim 8, wherein the calculating the temperature-resistance curve deviation rate and the curve deviation score of the temperature-sensing cable comprises: 曲线偏差率计算如下：The curve deviation rate is calculated as follows:
Figure FDA0002913939360000031
Figure FDA0002913939360000031
 其中，ez表示曲线偏差率，RMt表示目标温度为t时感温电缆实际阻值，采用标准电阻测量仪得到，RTt表示目标温度为t时感温电缆测量阻值，RCt表示目标温度为t时感温电缆标准阻值，c表示温度变化数量；Among them, ez represents the curve deviation rate, R Mt represents the actual resistance value of the temperature sensing cable when the target temperature is t, obtained by using a standard resistance measuring instrument, R Tt represents the measured resistance value of the temperature sensing cable when the target temperature is t, and R Ct represents the target temperature When the temperature is t, the standard resistance value of the temperature sensing cable, c represents the number of temperature changes; 曲线偏差得分计算如下：The curve deviation score is calculated as follows: P＝∑Pt P=∑P t
Figure FDA0002913939360000032
Figure FDA0002913939360000032
Figure FDA0002913939360000033
Figure FDA0002913939360000033
 其中，P表示感温电缆的曲线偏差总得分，Pt表示感温电缆目标温度为t时的曲线偏差得分，c1t、c2t表示感温电缆温度为t时偏差得分系数，et表示温度为t时阻值偏差率。Among them, P represents the total curve deviation score of the temperature sensing cable, P t represents the curve deviation score when the target temperature of the temperature sensing cable is t, c 1t and c 2t represent the deviation score coefficient when the temperature sensing cable temperature is t, and e t represents the temperature is the resistance deviation rate at t. 10.根据权利要求9所述的一种基于温阻特性的感温电缆性能检测方法，其特征在于，所述计算感温电缆温阻曲线大偏差点数量，包括：10. The method for detecting the performance of a temperature sensing cable based on a temperature resistance characteristic according to claim 9, wherein the calculating the number of large deviation points in the temperature resistance curve of the temperature sensing cable comprises: 当et大于Emax时对应的测量点为大偏差点，计算得到大偏差点数量N，Emax表示阻值偏差率预设阈值。When e t is greater than E max , the corresponding measurement point is a large deviation point, and the number N of large deviation points is obtained by calculation, and E max represents the preset threshold value of resistance deviation rate. 11.根据权利要求9所述的一种基于温阻特性的感温电缆性能检测方法，其特征在于，所述计算感温电缆温阻曲线最大变化率，包括：11. The method for detecting the performance of a temperature sensing cable based on a temperature resistance characteristic according to claim 9, wherein the calculating the maximum rate of change of the temperature resistance curve of the temperature sensing cable comprises: Mmax＝max||RT(t+1)-RTt|-|RC(t+1)-RCt||M max =max||R T(t+1) -R Tt |-|R C(t+1) -R Ct || 其中，Mmax表示感温电缆温阻特性标准曲线与测量曲线的最大变化率。Among them, M max represents the maximum rate of change between the standard curve and the measurement curve of the temperature resistance characteristic of the temperature sensing cable. 12.根据权利要求11所述的一种基于温阻特性的感温电缆性能检测方法，其特征在于，所述基于感温电缆温阻特性曲线偏差率，大偏差点数量和最大变化率建立感温电缆评价体系，将感温电缆按性能划分为Ⅰ、Ⅱ和Ⅲ三个等级，包括：12. A method for detecting the performance of a temperature-sensing cable based on a temperature-resistance characteristic according to claim 11, wherein the temperature-sensing cable is based on the deviation rate of the temperature-resistance characteristic curve of the temperature-sensing cable, the number of large deviation points, and the maximum rate of change to establish the sensor. The temperature cable evaluation system divides temperature sensing cables into three grades: I, II and III according to their performance, including: 感温电缆性能为Ⅰ级的评价标准：曲线偏差率ez小于5或者P＞80，且最大变化率Mmax小于1，且The performance of the temperature-sensing cable is the evaluation standard of class I: the curve deviation rate e z is less than 5 or P > 80, and the maximum change rate M max is less than 1, and 无大偏差点；No big deviation point; 感温电缆性能为Ⅱ级的评价标准为满足下述任意条件：The evaluation standard of the temperature-sensing cable performance of class II is to meet any of the following conditions: 条件1：曲线偏差率ez小于5或者P＞80，且最大变化率Mmax大于1，但不存在大偏差点；Condition 1: The curve deviation rate ez is less than 5 or P>80, and the maximum change rate Mmax is greater than 1, but there is no large deviation point; 条件2：曲线偏差率ez大于5或者60≤P＜80，且最大变化率Mmax小于1，且大偏差点数量N小于等于10；Condition 2: The curve deviation rate ez is greater than 5 or 60≤P <80, and the maximum change rate Mmax is less than 1, and the number of large deviation points N is less than or equal to 10; 感温电缆性能为Ⅲ级的评价标准：曲线偏差率ez大于5或者P＜60，且最大变化率Mmax大于1，且大偏差点数量N大于10。The performance of the temperature sensing cable is the evaluation standard of class III: the curve deviation rate e z is greater than 5 or P < 60, and the maximum change rate M max is greater than 1, and the number of large deviation points N is greater than 10.
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