CN105277793A - Cable conductor alternating current resistance measuring method and system - Google Patents
Cable conductor alternating current resistance measuring method and system Download PDFInfo
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- CN105277793A CN105277793A CN201510795840.6A CN201510795840A CN105277793A CN 105277793 A CN105277793 A CN 105277793A CN 201510795840 A CN201510795840 A CN 201510795840A CN 105277793 A CN105277793 A CN 105277793A
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Abstract
The invention provides a cable conductor alternating current resistance measuring method and system. Two electric parameter measuring points are arranged at a to-be-measured cable conductor and the distance between the two electric parameter measuring points is measured; current is applied to the to-be-measured cable conductor and the temperature of the to-be-measured cable conductor is measured; when the temperature of the to-be-measured cable conductor reaches a steady state, the current temperature of the to-be-measured cable conductor is obtained; the voltage effective value, the current effective value and the phase angle of the to-be-measured cable conductor between the two electric parameter measuring points are measured; according to the voltage effective value, the current effective value, the phase angle of the to-be-measured cable conductor between the two electric parameter measuring points and the distance and according to an alternating current resistance calculation formula, the alternating current resistance at the current temperature of the to-be-measured cable conductor is calculated. In the whole process, complicated data calculation and processing are not needed; strict data collection and calculation are adopted to obtain the alternating current resistance at the current temperature of the to-be-measured cable conductor accurately.
Description
Technical field
The present invention relates to electric power network technical field, particularly relate to cable conductor AC resistance measuring method and system.
Background technology
Along with national economy increases and the development of urbanization fast, adopt the demand of high voltage power cable multi-line power transmission increasing.In city, cable line is easier because having the relative overhead transmission line of addressing, does not affect again the feature of urban and is widely used in urban power distribution network.Cable line current-carrying capacity is the important dynamic operation parameter by environmental baseline and loading effects during cable line runs, and its importance relates to the operation of safe and reliable, the economical rationality of transmission line of electricity and cable line can Long Service Life problem.Cable line can generate heat, especially the heat build-up and make insulation life greatly shorten and damage when underground ventilation condition is bad.
Power cable line current-carrying capacity is closely related with the temperature of cable conductor in operation, and conductor temp .-elevating amount determines cable conductor medial temperature, calculates the size that its thermal value just must know cable conductor AC resistance.Therefore, the calculating of power cable conductor AC resistance is the basis determining its current-carrying capacity, in order to make the safe and reliable operation of cable line, accurately determines that cable line AC resistance is highly significant and necessity.
At present, the conventional method that the conductor alternating current resistance in cable line carrying current calculation is determined first calculates the resistance delta caused by kelvin effect and proximity effect, then the direct current resistance recommendation that this increment and IEC standard provide is added, is AC resistance.Therefore when cable conductor dispatches from the factory, only measure direct current resistance, then calculate AC resistance, this computing method are comparatively complicated and result of calculation is accurate not.
Summary of the invention
Based on this, be necessary for existing cable conductor AC resistance measuring method measuring process complexity and the inaccurate problem of measurement result, provide a kind of measuring process simple and measurement result cable conductor AC resistance measuring method and system accurately.
A kind of cable conductor AC resistance measuring method, comprises step:
Cable under test conductor arranges at least two spaced measurement points, and choosing any two described measurement points is two electric parameter measurement points, and measures the spacing of described two electric parameter measurement points;
Electric current is applied to described cable under test conductor, detects described cable under test conductor temperature, when described cable under test conductor temperature reaches stable state, obtain the Current Temperatures of described cable under test conductor;
Measure the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value and phasing degree;
According to the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value, phasing degree and distance, according to AC resistance computing formula, calculate the AC resistance under described cable under test conductor Current Temperatures.
A kind of cable conductor AC resistance measuring system, comprising:
Distance-measurement module, for arranging at least two spaced measurement points on cable under test conductor, choosing any two described measurement points is two electric parameter measurement points, and measures the spacing of described two electric parameter measurement points;
Temperature-measuring module, for applying electric current to described cable under test conductor, detecting described cable under test conductor temperature, when described cable under test conductor temperature reaches stable state, obtaining the Current Temperatures of described cable under test conductor;
Electrical parameter measuring module, for measuring the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value and phasing degree;
Computing module, for the voltage effective value according to the described cable under test conductor between described two electric parameter measurement points, current effective value, phasing degree and distance, according to AC resistance computing formula, calculate the AC resistance under described cable under test conductor Current Temperatures.
Cable conductor AC resistance measuring method of the present invention and system, at cable under test conductor, two electric parameter measurement points are set, and measure the spacing of two electric parameter measurement points, electric current is applied to described cable under test conductor, detect described cable under test conductor temperature, when described cable under test conductor temperature reaches stable state, obtain the Current Temperatures of described cable under test conductor, measure the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value and phasing degree, according to the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value, phasing degree and distance, according to AC resistance computing formula, calculate the AC resistance under described cable under test conductor Current Temperatures.In whole process, the data without the need to complexity calculate and process, adopt rigorous data acquisition and calculating, accurately calculate the AC resistance under cable under test conductor Current Temperatures.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of cable conductor AC resistance measuring method of the present invention first embodiment;
Fig. 2 is the schematic flow sheet of cable conductor AC resistance measuring method of the present invention second embodiment;
Fig. 3 is the structural representation of cable conductor AC resistance measuring system of the present invention first embodiment;
Fig. 4 is the structural representation of cable conductor AC resistance measuring system of the present invention second embodiment.
Embodiment
Cable comprises the insulation course of conductor (core) and outside coating conductor, here, we need study be cable conductor (core) AC resistance measure.
As shown in Figure 1, a kind of cable conductor AC resistance measuring method, comprises step:
S100: arrange at least two spaced measurement points on cable under test conductor, choosing any two described measurement points is two electric parameter measurement points, and measures the spacing of described two electric parameter measurement points.
In practical operation, cable under test conductor length may be there is long, now, the cable conductor of random length can be intercepted as AC resistance measuring object on cable under test conductor.
S200: electric current is applied to described cable under test conductor, detects described cable under test conductor temperature, when described cable under test conductor temperature reaches stable state, obtain the Current Temperatures of described cable under test conductor.
Electric current is applied to cable conductor to be measured, can there is fever phenomenon in cable conductor, namely the temperature of cable conductor progressively raises within a certain period of time, when reaching point (being generally half an hour) sometime, cable conductor temperature will enter stable state, now measure the Current Temperatures of cable conductor.Cable conductor is applied to the electric current of varying strength, the higher limit that the temperature of cable conductor raises is different.In practical operation, temperature survey can adopt temperature sensor mode to detect, and in order to reduce the error measured, can adopt the mode that repetitive measurement is averaged, obtaining the Current Temperatures of cable under test conductor.
S300: measure the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value and phasing degree.
Power quality analyzer specifically can be adopted to measure the voltage effective value of cable under test conductor between two electric parameter measurement points, current effective value and phasing degree.The mode that repetitive measurement is averaged can be adopted in measuring process, to reduce error, improve the accuracy of measurement data.
S400: according to the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value, phasing degree and distance, according to AC resistance computing formula, calculate the AC resistance under described cable under test conductor Current Temperatures.
Specifically, AC resistance computing formula is specially:
In formula, R is cable conductor AC resistance, and U is voltage effective value, and I is current effective value, and d is the spacing of two electric parameter measurement points, and θ is phasing degree.
It is to be noted, in cable conductor AC resistance measuring method process of the present invention, can when applying same current to cable conductor to be measured, by selecting different measuring point as electric parameter measurement point, perform step S300 and step S400 respectively, obtain the AC resistance under multiple cable under test conductor Current Temperatures, calculate the mean value of the AC resistance under described multiple cable under test conductor Current Temperatures again, thus reduction error, improve the accuracy of cable conductor AC resistance measurement result.
Cable conductor AC resistance measuring method of the present invention, at cable under test conductor, two electric parameter measurement points are set, and measure the spacing of two electric parameter measurement points, electric current is applied to described cable under test conductor, detect described cable under test conductor temperature, when described cable under test conductor temperature reaches stable state, obtain the Current Temperatures of described cable under test conductor, measure the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value and phasing degree, according to the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value, phasing degree and distance, according to AC resistance computing formula, calculate the AC resistance under described cable under test conductor Current Temperatures.In whole process, the data without the need to complexity calculate and process, adopt rigorous data acquisition and calculating, accurately calculate the AC resistance under cable under test conductor Current Temperatures.
Wherein in an embodiment, describedly on cable under test conductor, arrange at least two spaced measurement points, choosing any two described measurement points is two electric parameter measurement points, and the step measuring the spacing of described two electric parameter measurement points specifically comprises:
Two electric parameter measurement points are set respectively at the two ends of cable under test conductor, and between described two electric parameter measurement points, line is vertical with described cable under test conductors cross;
Measure the spacing of described two electric parameter measurement points.
Its area of section size of the cable conductor of different thicknesses is not identical, and such as family expenses common cable is 5mm
2, cross-section of cable area thick in electric power network can reach 2500mm
2.When two electric parameter measurement points are set respectively at the two ends of cable under test conductor, consider that electric parameter measurement point can produce error to measurement result at cross-section of cable diverse location.Here, two electric parameter measurement point positions are rationally set, to make line between two electric parameter measurement points vertical with cable under test conductors cross, namely guarantee that the distance that two electric parameter measurement points arrive cable conductor section edges is in the same direction identical.Effectively can avoid electric parameter measurement point position that difference is set like this and error is caused to measurement result, effectively improve the accuracy of whole cable conductor AC resistance measuring method.
As shown in Figure 2, wherein in an embodiment, described step S200 specifically comprises:
S220: the multiple point for measuring temperature of spaced set on described cable under test conductor, set temperature checkout equipment is in point for measuring temperature described in each respectively.
S240: electric current is applied to described cable under test conductor, detects the temperature at each point for measuring temperature place of described cable under test conductor.
S260: when the temperature at each point for measuring temperature place all reaches described stable state, calculate the mean value of all point for measuring temperature places temperature, is described cable under test conductor Current Temperatures.
General temperature measuring point is arranged between two electric parameter measurement points.In the present embodiment, the mode adopting repetitive measurement to average realizes the Measurement accuracy to cable conductor Current Temperatures to be measured.Specifically, spaced set 3 points for measuring temperature on cable under test conductor, respectively temperature measurer is set at 3 point for measuring temperature places, electric current is applied to cable conductor to be measured, detect the temperature of 3 point for measuring temperature place cable under test conductors, when the temperature of 3 point for measuring temperature place cable under test conductors all reaches stable state, calculate the mean value of 3 point for measuring temperature place temperature, this mean value is cable under test conductor Current Temperatures.
Wherein in an embodiment, the condition that the temperature of described cable under test conductor reaches stable state is:
The temperature variation of temperature in Preset Time of described cable under test conductor is not more than 0.5 DEG C.
Preset Time is half an hour.
Wherein in an embodiment, described AC resistance computing formula is specially:
In formula, R is cable conductor AC resistance, and U is voltage effective value, and I is current effective value, and d is the spacing of two electric parameter measurement points, and θ is phasing degree.
Specifically, the derivation of above-mentioned formula is as follows: the ratio of cable conductor both end voltage effective value U and current effective value I, the impedance Z of this section of cable conductor can be obtained, the cosine value of phasing degree θ is multiplied by again by the impedance Z of cable conductor, i.e. cos θ, the AC resistance of this section of cable conductor can be obtained, finally by it divided by electric parameter measurement dot spacing d, just can obtain the cable conductor AC resistance of unit length.
As shown in Figure 3, a kind of cable conductor AC resistance measuring system, comprising:
Distance-measurement module 100, for arranging at least two spaced measurement points on cable under test conductor, choosing any two described measurement points is two electric parameter measurement points, and measures the spacing of described two electric parameter measurement points;
Temperature-measuring module 200, for applying electric current to described cable under test conductor, detecting described cable under test conductor temperature, when described cable under test conductor temperature reaches stable state, obtaining the Current Temperatures of described cable under test conductor;
Electrical parameter measuring module 300, for measuring the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value and phasing degree;
Computing module 400, for the voltage effective value according to the described cable under test conductor between described two electric parameter measurement points, current effective value, phasing degree and distance, according to AC resistance computing formula, calculate the AC resistance under described cable under test conductor Current Temperatures.
Cable conductor AC resistance measuring system of the present invention, distance-measurement module 100 arranges two electric parameter measurement points at cable under test conductor, and measure the spacing of two electric parameter measurement points, temperature-measuring module 200 applies electric current to described cable under test conductor, detect described cable under test conductor temperature, when described cable under test conductor temperature reaches stable state, obtain the Current Temperatures of described cable under test conductor, electrical parameter measuring module 300 measures the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value and phasing degree, computing module 400 is according to the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value, phasing degree and distance, according to AC resistance computing formula, calculate the AC resistance under described cable under test conductor Current Temperatures.In whole process, the data without the need to complexity calculate and process, adopt rigorous data acquisition and calculating, accurately calculate the AC resistance under cable under test conductor Current Temperatures.
Wherein in an embodiment, described distance-measurement module 100 specifically comprises:
Electric parameter measurement point setting unit, arranges two electric parameter measurement points respectively for the two ends at cable under test conductor, and between described two electric parameter measurement points, line is vertical with described cable under test conductors cross;
Distance measuring unit, for measuring the spacing of described two electric parameter measurement points.
As shown in Figure 4, wherein in an embodiment, described temperature-measuring module 200 specifically comprises:
Temperature measuring point setting unit 220, arrange two electric parameter measurement points respectively for the two ends at cable under test conductor, set temperature checkout equipment is in point for measuring temperature described in each respectively;
Detecting unit 240, for applying electric current to described cable under test conductor, detects the temperature at each point for measuring temperature place of described cable under test conductor;
Temperature averages computing unit 260, for when the temperature at each point for measuring temperature place all reaches described stable state, calculates the mean value of all point for measuring temperature places temperature, is described cable under test conductor Current Temperatures.
Wherein in an embodiment, the condition that the temperature of described cable under test conductor reaches stable state is:
The temperature variation of temperature in Preset Time of described cable under test conductor is not more than 0.5 DEG C.
Wherein in an embodiment, described AC resistance computing formula is specially:
In formula, R is cable conductor AC resistance, and U is voltage effective value, and I is current effective value, and d is the spacing of two electric parameter measurement points, and θ is phasing degree.
In order to the technical scheme of further explaining cable conductor AC resistance measuring method of the present invention and system in detail and the effect brought thereof, below by employing instantiation and binding tests data be described.
Subjects: the section of choosing cross section is 240mm
2high pressure list core is test cable conductor.
Process of the test:
Step one: arrange an electric parameter measurement point at test cable two ends respectively, guarantee that the line of two electric parameter measurement points is perpendicular to cable conductor xsect, the distance between two electric parameter measurement points is d=8.8m.
Step 2: equidistantly between two electric parameter measurement points get three points for measuring temperature, then getting place's punching to cable core respectively, the punching degree of depth will try one's best identical and will be guaranteed to punch the degree of depth to cable core place.
Step 3: lay a thermopair respectively at three points for measuring temperature, and be connected with temperature measurer.
Step 4: 300A/500A/700A tri-sections of electric currents are loaded respectively to test cable, every section of current load 2.5 hours.
Step 5: measure the voltage effective value U between two measurement points with power quality analyzer, current effective value I, phasing degree θ, continuous coverage three times, data measured is as following table 1; Record the temperature of three points for measuring temperature on temperature measurer simultaneously, the mean value getting three temperature values as the temperature T of this section of cable conductor under this stable state, as following table 2.
Table 1 loads measurement data when different electric current reaches stable state
Table 2 loads temperature measuring data when different electric current reaches stable state
Step 6: according to AC resistance computing formula, calculates the AC resistance obtaining test cable conductor.Concrete outcome is as shown in table 3.
Conductor alternating current resistance under table 3 different temperatures compares
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a cable conductor AC resistance measuring method, is characterized in that, comprises step:
Cable under test conductor arranges at least two spaced measurement points, and choosing any two described measurement points is two electric parameter measurement points, and measures the spacing of described two electric parameter measurement points;
Electric current is applied to described cable under test conductor, detects described cable under test conductor temperature, when described cable under test conductor temperature reaches stable state, obtain the Current Temperatures of described cable under test conductor;
Measure the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value and phasing degree;
According to the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value, phasing degree and distance, according to AC resistance computing formula, calculate the AC resistance under described cable under test conductor Current Temperatures.
2. cable conductor AC resistance measuring method according to claim 1, it is characterized in that, described at least two spaced measurement points are set on cable under test conductor, choosing any two described measurement points is two electric parameter measurement points, and the step measuring the spacing of described two electric parameter measurement points specifically comprises:
Two electric parameter measurement points are set respectively at the two ends of cable under test conductor, and between described two electric parameter measurement points, line is vertical with described cable under test conductors cross;
Measure the spacing of described two electric parameter measurement points.
3. cable conductor AC resistance measuring method according to claim 1 and 2, it is characterized in that, described to described cable under test conductor applying electric current, detect the temperature of described cable under test conductor, when the temperature of described cable under test conductor reaches stable state, the step obtaining cable under test conductor Current Temperatures specifically comprises:
The multiple point for measuring temperature of spaced set on described cable under test conductor, set temperature checkout equipment is in point for measuring temperature described in each respectively;
Electric current is applied to described cable under test conductor, detects the temperature at each point for measuring temperature place of described cable under test conductor;
When the temperature at each point for measuring temperature place all reaches described stable state, calculate the mean value of all point for measuring temperature places temperature, be described cable under test conductor Current Temperatures.
4. cable conductor AC resistance measuring method according to claim 1 and 2, is characterized in that, the condition that the temperature of described cable under test conductor reaches stable state is:
The temperature variation of temperature in Preset Time of described cable under test conductor is not more than 0.5 DEG C.
5. cable conductor AC resistance measuring method according to claim 1 and 2, is characterized in that, described AC resistance computing formula is specially:
In formula, R is cable conductor AC resistance, and U is voltage effective value, and I is current effective value, and d is the spacing of two electric parameter measurement points, and θ is phasing degree.
6. a cable conductor AC resistance measuring system, is characterized in that, comprising:
Distance-measurement module, for arranging at least two spaced measurement points on cable under test conductor, choosing any two described measurement points is two electric parameter measurement points, and measures the spacing of described two electric parameter measurement points;
Temperature-measuring module, for applying electric current to described cable under test conductor, detecting described cable under test conductor temperature, when described cable under test conductor temperature reaches stable state, obtaining the Current Temperatures of described cable under test conductor;
Electrical parameter measuring module, for measuring the voltage effective value of the described cable under test conductor between described two electric parameter measurement points, current effective value and phasing degree;
Computing module, for the voltage effective value according to the described cable under test conductor between described two electric parameter measurement points, current effective value, phasing degree and distance, according to AC resistance computing formula, calculate the AC resistance under described cable under test conductor Current Temperatures.
7. cable conductor AC resistance measuring system according to claim 6, it is characterized in that, described distance-measurement module specifically comprises:
Electric parameter measurement point setting unit, arranges two electric parameter measurement points respectively for the two ends at cable under test conductor, and between described two electric parameter measurement points, line is vertical with described cable under test conductors cross;
Distance measuring unit, for measuring the spacing of described two electric parameter measurement points.
8. the cable conductor AC resistance measuring system according to claim 6 or 7, it is characterized in that, described temperature-measuring module specifically comprises:
Temperature measuring point setting unit, arrange two electric parameter measurement points respectively for the two ends at cable under test conductor, set temperature checkout equipment is in point for measuring temperature described in each respectively;
Detecting unit, for applying electric current to described cable under test conductor, detects the temperature at each point for measuring temperature place of described cable under test conductor;
Temperature averages computing unit, for when the temperature at each point for measuring temperature place all reaches described stable state, calculates the mean value of all point for measuring temperature places temperature, is described cable under test conductor Current Temperatures.
9. the cable conductor AC resistance measuring system according to claim 6 or 7, is characterized in that, the condition that the temperature of described cable under test conductor reaches stable state is:
The temperature variation of temperature in Preset Time of described cable under test conductor is not more than 0.5 DEG C.
10. the cable conductor AC resistance measuring system according to claim 6 or 7, is characterized in that, described AC resistance computing formula is specially:
In formula, R is cable conductor AC resistance, and U is voltage effective value, and I is current effective value, and d is the spacing of two electric parameter measurement points, and θ is phasing degree.
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| CN108344898A (en) * | 2018-01-31 | 2018-07-31 | 华南理工大学 | A kind of preformed armor rods incision position contact resistance experimental measurement method based on heat to electricity conversion |
| CN108931690A (en) * | 2018-07-23 | 2018-12-04 | 秦国锋 | Embedded AC resistance measuring system based on ARM |
| CN110082601A (en) * | 2019-05-23 | 2019-08-02 | 中国电力科学研究院有限公司 | It is a kind of for measuring the device and method of the AC resistance of cable conductor |
| CN110320409A (en) * | 2019-06-26 | 2019-10-11 | 国网冀北电力有限公司唐山供电公司 | A kind of big section XLPE cable conductor AC resistance measurement method |
| CN111239493A (en) * | 2020-02-06 | 2020-06-05 | 张军 | Method for measuring resistance of power transmission cable |
| CN111239519A (en) * | 2020-02-06 | 2020-06-05 | 张军 | Electric energy monitoring method |
| CN111239492A (en) * | 2020-02-06 | 2020-06-05 | 张军 | Power transmission cable resistance measurement method and system |
| CN113238096A (en) * | 2021-04-29 | 2021-08-10 | 国网新疆电力有限公司电力科学研究院 | Wire and cable direct current resistance parameter measuring device |
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| CN102759665A (en) * | 2011-04-27 | 2012-10-31 | 上海市电力公司 | Device for detecting alternating-current resistance of high-pressure cable split conductor |
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| CN102759665A (en) * | 2011-04-27 | 2012-10-31 | 上海市电力公司 | Device for detecting alternating-current resistance of high-pressure cable split conductor |
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| CN108344898A (en) * | 2018-01-31 | 2018-07-31 | 华南理工大学 | A kind of preformed armor rods incision position contact resistance experimental measurement method based on heat to electricity conversion |
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| CN110320409A (en) * | 2019-06-26 | 2019-10-11 | 国网冀北电力有限公司唐山供电公司 | A kind of big section XLPE cable conductor AC resistance measurement method |
| CN111239493A (en) * | 2020-02-06 | 2020-06-05 | 张军 | Method for measuring resistance of power transmission cable |
| CN111239519A (en) * | 2020-02-06 | 2020-06-05 | 张军 | Electric energy monitoring method |
| CN111239492A (en) * | 2020-02-06 | 2020-06-05 | 张军 | Power transmission cable resistance measurement method and system |
| CN113238096A (en) * | 2021-04-29 | 2021-08-10 | 国网新疆电力有限公司电力科学研究院 | Wire and cable direct current resistance parameter measuring device |
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Application publication date: 20160127 |
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