CN105300557A - Cable conductor temperature measuring device and method - Google Patents
Cable conductor temperature measuring device and method Download PDFInfo
- Publication number
- CN105300557A CN105300557A CN201510766979.8A CN201510766979A CN105300557A CN 105300557 A CN105300557 A CN 105300557A CN 201510766979 A CN201510766979 A CN 201510766979A CN 105300557 A CN105300557 A CN 105300557A
- Authority
- CN
- China
- Prior art keywords
- cable
- temperature
- conductor
- voltage sampling
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention relates to a cable conductor temperature measuring device and method. The device comprises a temperature measuring module, a current detection module, a temperature signal conversion module, a current signal conversion module and a micro-control unit MCU processor. The temperature measuring module is used for measuring the temperature value of a cable connector. The current detection module is used for detecting load current of a cable line. The temperature signal conversion module is used for converting the temperature value of the cable connector into a first voltage sampling signal. The current signal conversion module is used for converting load current of the cable line into a second voltage sampling signal. The MCU processor is used for calculating the temperature value of a cable conductor by the first voltage sampling signal and the second voltage sampling signal. According to the device and the method, temperature of the cable conductor is calculated by measuring temperature of the cable connector and load current of the cable so that calculation is simple. Accidents caused by abnormal heating of the cable can be early warned so that the disaster accidents can be avoided.
Description
Technical field
The application relates to technical field of temperature measurement, particularly relates to a kind of temperature measurement of cable conductor device and method.
Background technology
In a power distribution system, controller switching equipment such as the equipment such as ring main unit, distribution box, case change, power cable have been used widely, especially city net, have substantially popularized and have put in place.In cable line During Process of Long-term Operation, because the factors such as the office that office puts, cable line self-defect causes that cable line is load unbalanced, cable termination defect causes puts, ageing equipment cause the cable line especially abnormal rising of cable line tie point position temperature, will switchgear be given, power cable brings potential safety hazard.Even can cause circuit, equipment explosion when temperature is too high, not only can cause device damage, even can cause personnel casualty accidents, the line outage accident simultaneously caused can bring very large economy to damage to power consumer, social influence very severe.Therefore how Real-Time Monitoring cable line running status, realize accident early warning and science is provided, active demand that the solution of fixing a breakdown efficiently has become power circuit operation management department.
The technology of current existence:
1) smoke transducer
Inside fire protection smoke transducer can be used for the fire that monitoring cable causes, but this Sensor monitoring is smokescope, when cable abnormal heating send smog cause sensor alarm time, fire occurs, and has caused certain loss.Therefore, although smoke transducer can carry out alarm to the fire occurred, early warning can not be carried out to disaster.
2) temperature sensing cable
Temperature sensing cable, by temperature sensing cable and cable parallelization, by arranging a definite value in advance to the temperature-sensitive steel wire be attached on cable, when the temperature inside cable reaches setting value, temperature sensing cable will be short-circuited, and temperature sensing cable just can reach the object of monitoring cable temperature by short-circuit signal.But temperature sensing cable is reported to the police and is only had Zone Alerts function, accurately cannot locate, can not measure the temperature of cable.
3) temperature sensor
Temperature sensor is fixed on monitoring point, directly measures the temperature of cable skin.Set a temperature threshold, when the cable skin temperature that temperature sensor detects exceedes temperature threshold, temperature sensor is reported to the police.This method parameter amount is large, calculation of complex, and easily occurs erroneous judgement and fail to judge.
Summary of the invention
The object of the application is to provide a kind of temperature measurement of cable conductor device and method, calculates cable conductor temperature by measurement temperature of cable junction and cable load current, and calculate simple, error is little.
For achieving the above object, first aspect, this application provides a kind of temperature measurement of cable conductor device, described device comprises:
Temperature-measuring module, current detection module, temperature signal modular converter, current signal modular converter, MCU processor;
Described temperature-measuring module, for measuring temperature of cable junction value, and sends to temperature signal modular converter by described cable skin temperature value;
Described current detection module, for detection streamer line load electric current, and sends to current signal modular converter by described cable line load current;
Described temperature signal modular converter, for described temperature of cable junction value is converted to the first voltage sampling signal, and sends to described MCU processor module by described first voltage sampling signal;
Described current signal modular converter, for described cable line load current is converted to the second voltage sampling signal, and sends to described MCU processor module by described second voltage sampling signal;
Described MCU processor, calculates cable conductor temperature value for utilizing described first voltage sampling signal and described second voltage sampling signal.
Second aspect, this application provides a kind of temperature measurement of cable conductor method, described method comprises:
Measure temperature of cable junction value and cable line load current respectively;
Described temperature of cable junction value and described cable line load current are converted to the first voltage sampling signal and the second voltage sampling signal respectively;
Described first voltage sampling signal and described second voltage sampling signal is utilized to calculate cable conductor temperature value.
The temperature measurement of cable conductor device and method that the embodiment of the present application provides, calculates cable conductor temperature by measurement temperature of cable junction and cable load current, and calculate simple, error is little.The accident caused for cable abnormal heating can give warning in advance, and avoids disaster accident to occur.
Accompanying drawing explanation
The temperature measurement of cable conductor device schematic diagram that Fig. 1 provides for the embodiment of the present application one;
The temperature measurement of cable conductor method flow diagram that Fig. 2 provides for the embodiment of the present application one.
Embodiment
Below by drawings and Examples, the technical scheme of the application is described in further detail.
The temperature measurement of cable conductor device schematic diagram that Fig. 1 provides for the embodiment of the present application one.As shown in Figure 1, described device comprises: temperature-measuring module 10, current detection module 20, temperature signal modular converter 30, current signal modular converter 40, MCU processor 50.
Cable skin temperature value for measuring temperature of cable junction value, and is sent to temperature signal modular converter by temperature-measuring module 10.Temperature-measuring module 10 is specifically as follows temperature sensor, and temperature sensor, when measuring cable skin temperature, is close to cable splice place epidermis through conducting strip, accurately and timely can be monitored the temperature conditions at cable splice place.
Cable line load current for detection streamer line load electric current, and is sent to current signal modular converter by current detection module 20.The closed-loop path that current detection module 20 utilizes inductive coil and magnet to form, detection streamer line load electric current.
First voltage sampling signal for temperature of cable junction value is converted to the first voltage sampling signal, and is sent to described MCU processor module by temperature signal modular converter 30.
Described second voltage sampling signal for described cable line load current is converted to the second voltage sampling signal, and is sent to described MCU processor module by current signal modular converter 40.Current signal modular converter 40 is specifically as follows I-V change-over circuit.By electromagnetic induction principle, the load current of cable line is changed output second voltage sampling signal through I-V, the signal magnitude exported due to I-V is directly proportional to line load size of current, therefore, it is possible to realize the real-time detection to cable line load current.
MCU processor 50 calculates cable conductor temperature value for utilizing described first voltage sampling signal and described second voltage sampling signal.
Cable conductor temperature value θ=Δ θ+θ
ring, wherein, θ
ringfor temperature of cable junction value, be converted to the first voltage sampling signal through temperature signal modular converter; Δ θ is the temperature difference between cable conductor and insulation sheath
w
cfor every phase conductor loss W of every centimetre of cable
c=I
2r; I is cable line load current, is converted to the second voltage sampling signal through current signal modular converter; R is cable AC electric resistance; W
dfor the dielectric loss of every meter of cable length, T
1for thermal resistance between conductor and sheath.
Cable model is certain, and the phase voltage in power distribution network is certain, then T1, W
dfor definite value; I is known for cable line load current, and cable AC electric resistance R is definite value, according to formula W
c=I
2r, obtains W
c; According to formula
obtain Δ θ, and then obtain cable conductor temperature θ.
It should be noted that, the inner liner of cable, serving and extraneous medium affect less on cable conductor temperature, and the application, when calculating cable conductor temperature, affects little parameter ignorance to temperature and disregards, do not affect the accuracy of calculating.
MCU processor 50 also for judging whether cable temperature occurs exception according to cable conductor temperature value, when the temperature that the temperature of cable conductor is greater than default first threshold or cable conductor raise be greater than default Second Threshold time, determine that cable temperature is abnormal.
Wherein, first threshold and Second Threshold can be arranged according to actual conditions.
Described device also comprises alarm display module 60, information transmission modular 70, analyzes judge module 80 and power module 90.
When cable temperature occurs abnormal, abnormal information is sent to alarm display module 60 and information transmission modular 70 by MCU processor 50, alarm display module 60 carries out alarm display according to abnormal information, simultaneously, abnormal information sends to by information transmission modular 70 analyzes judge module 80, analyzes judge module 80 pairs of abnormal informations and carries out fault analysis.
When cable temperature is normal, cable conductor temperature value is sent to information transmission modular 70 by MCU processor 50, and cable conductor temperature value sends to by information transmission modular 70 analyzes judge module 80, analyzes judge module 80 and judges whether the three-phase temperature of cable balances.
Wherein, information transmission modular 70 is specifically as follows radio communication circuit, optical fiber communication circuit etc.
Power module 90 comprises automatic electricity getting circuit and storage unit;
Automatic electricity getting circuit is used for that electromagnetic induction signal is converted to electric energy and sends to storage unit;
When the load current on cable line is enough large, such as, when being greater than 10A, the electric energy that power module 90 obtains just can be powered for temperature-measuring module 10, MCU processor 50, information transmission modular 70.
Storage unit is specifically as follows super-capacitor device, rechargeable battery device etc.Storage unit is used for storage of electrical energy, for temperature-measuring module 10, MCU processor 50, information transmission modular 70 are powered.
The various piece of the temperature measurement of cable conductor device that the embodiment of the present application provides is sealed in insulation crust, and structure is simple, and volume is little, lightweight, flexibly easy for installation.
The temperature measurement of cable conductor device that the embodiment of the present application provides, calculates cable conductor temperature by measurement temperature of cable junction and cable load current, and calculate simple, error is little.The accident caused for cable abnormal heating can give warning in advance, and avoids disaster accident to occur.
The temperature measurement of cable conductor method flow diagram that Fig. 2 provides for the embodiment of the present application one.As shown in Figure 2, described method comprises:
Step 201, measures temperature of cable junction value and cable line load current respectively.
Step 202, is converted to the first voltage sampling signal and the second voltage sampling signal respectively by described temperature of cable junction value and described cable line load current.
Step 203, utilizes described first voltage sampling signal and described second voltage sampling signal to calculate cable conductor temperature value.
Further, utilize described first voltage sampling signal and described second voltage sampling signal to calculate cable conductor temperature value to be specially:
According to formula
calculate cable conductor temperature value; Wherein, Δ θ is the temperature difference between cable conductor and insulation sheath, W
cfor every phase conductor loss of every centimetre of cable, W
dfor the dielectric loss of every meter of cable length, T
1for thermal resistance between conductor and sheath.
Preferably, described method also comprises:
Judge whether cable temperature occurs exception according to cable conductor temperature value, when the temperature that the temperature of cable conductor is greater than default first threshold or cable conductor raise be greater than default Second Threshold time, determine that cable temperature is abnormal.
Preferably, described method also comprises:
When cable temperature occurs abnormal, fault analysis is carried out to described abnormal information;
When cable temperature is normal, judge whether the three-phase temperature of cable balances.
The temperature measurement of cable conductor method that the embodiment of the present application provides, calculates cable conductor temperature by measurement temperature of cable junction and cable load current, and calculate simple, error is little.The accident caused for cable abnormal heating can give warning in advance, and avoids disaster accident to occur.
Above-described embodiment; the object of the application, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the embodiment of the application; and be not used in the protection domain limiting the application; within all spirit in the application and principle, any amendment made, equivalent replacement, improvement etc., within the protection domain that all should be included in the application.
Claims (13)
1. a temperature measurement of cable conductor device, is characterized in that, described device comprises: temperature-measuring module, current detection module, temperature signal modular converter, current signal modular converter, micro-control unit MCU processor;
Described temperature-measuring module, for measuring temperature of cable junction value, and sends to temperature signal modular converter by described temperature of cable junction value;
Described current detection module, for detection streamer line load electric current, and sends to current signal modular converter by described cable line load current;
Described temperature signal modular converter, for described temperature of cable junction value is converted to the first voltage sampling signal, and sends to described MCU processor module by described first voltage sampling signal;
Described current signal modular converter, for described cable line load current is converted to the second voltage sampling signal, and sends to described MCU processor module by described second voltage sampling signal;
Described MCU processor, calculates cable conductor temperature value for utilizing described first voltage sampling signal and described second voltage sampling signal.
2. device according to claim 1, is characterized in that, described MCU processor, specifically for according to formula
calculate cable conductor temperature value; Wherein, Δ θ is the temperature difference between cable conductor and insulation sheath, W
cfor every phase conductor loss of every centimetre of cable, W
dfor the dielectric loss of every meter of cable length, T
1for thermal resistance between conductor and sheath.
3. device according to claim 1, it is characterized in that, according to cable conductor temperature value, described MCU processor is also for judging whether cable temperature occurs exception, when the temperature that the temperature of cable conductor is greater than default first threshold or cable conductor raise be greater than default Second Threshold time, determine that cable temperature is abnormal.
4. device according to claim 1, is characterized in that, described device also comprises: alarm display module;
Described alarm display module is used for carrying out alarm display according to abnormal information.
5. device according to claim 1, is characterized in that, described device also comprises: analyze judge module;
Described analysis judge module is used for, when cable temperature occurs abnormal, carrying out fault analysis to described abnormal information;
When cable temperature is normal, judge whether the three-phase temperature of cable balances.
6. device according to claim 1, is characterized in that, described device also comprises: information transmission modular;
Described information transmission modular is used for, when cable temperature occurs abnormal, described abnormal information being sent to analysis judge module;
When cable temperature is normal, described cable conductor temperature value is sent to analysis judge module.
7. device according to claim 1, is characterized in that, described MCU processor also for:
When cable temperature occurs abnormal, described abnormal information is sent to information transmission modular and alarm display module;
When cable temperature is normal, described cable conductor temperature value is sent to information transmission modular.
8. device according to claim 1, is characterized in that, described device also comprises: power module, and described power module comprises automatic electricity getting circuit and storage unit;
Described automatic electricity getting circuit is used for that electromagnetic induction signal is converted to electric energy and sends to storage unit;
Described storage unit is used for storage of electrical energy, for described temperature-measuring module, described MCU processor, described information transmission modular are powered.
9. device according to claim 1, is characterized in that, described current detection module specifically for: utilize the closed-loop path that inductive coil and magnet are formed, detection streamer line load electric current.
10. a temperature measurement of cable conductor method, is characterized in that, described method comprises:
Measure temperature of cable junction value and cable line load current respectively;
Described temperature of cable junction value and described cable line load current are converted to the first voltage sampling signal and the second voltage sampling signal respectively;
Described first voltage sampling signal and described second voltage sampling signal is utilized to calculate cable conductor temperature value.
11. methods according to claim 10, is characterized in that, described described first voltage sampling signal and the described second voltage sampling signal calculating cable conductor temperature value of utilizing is specially:
According to formula
calculate cable conductor temperature value; Wherein, Δ θ is the temperature difference between cable conductor and insulation sheath, W
cfor every phase conductor loss of every centimetre of cable, W
dfor the dielectric loss of every meter of cable length, T
1for thermal resistance between conductor and sheath.
12. methods according to claim 10, is characterized in that, described method also comprises:
Judge whether cable temperature occurs exception according to cable conductor temperature value, when the temperature that the temperature of cable conductor is greater than default first threshold or cable conductor raise be greater than default Second Threshold time, determine that cable temperature is abnormal.
13. methods according to claim 12, is characterized in that, described method also comprises:
When cable temperature occurs abnormal, fault analysis is carried out to described abnormal information;
When cable temperature is normal, judge whether the three-phase temperature of cable balances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510766979.8A CN105300557A (en) | 2015-11-11 | 2015-11-11 | Cable conductor temperature measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510766979.8A CN105300557A (en) | 2015-11-11 | 2015-11-11 | Cable conductor temperature measuring device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105300557A true CN105300557A (en) | 2016-02-03 |
Family
ID=55198075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510766979.8A Pending CN105300557A (en) | 2015-11-11 | 2015-11-11 | Cable conductor temperature measuring device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105300557A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105890796A (en) * | 2016-06-14 | 2016-08-24 | 东莞市联洲知识产权运营管理有限公司 | Cable conductor temperature measuring device |
| CN109115278A (en) * | 2018-10-18 | 2019-01-01 | 国网山东省电力公司应急管理中心 | A kind of fine early warning system of GIS power grid based on cable sensor |
| CN112834066A (en) * | 2020-12-30 | 2021-05-25 | 深圳供电局有限公司 | Cable temperature detection device, system and method |
| CN112985644A (en) * | 2021-05-18 | 2021-06-18 | 深圳市共济科技股份有限公司 | Bus duct abnormal temperature rise early warning method and system |
| CN113011015A (en) * | 2021-03-04 | 2021-06-22 | 国网浙江省电力有限公司嘉兴供电公司 | Safety control method for dynamic capacity increase of power transmission and transformation line |
| CN114202875A (en) * | 2021-12-09 | 2022-03-18 | 江苏业力科技有限公司 | Fire early warning method based on logarithm inverse time limit principle |
-
2015
- 2015-11-11 CN CN201510766979.8A patent/CN105300557A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105890796A (en) * | 2016-06-14 | 2016-08-24 | 东莞市联洲知识产权运营管理有限公司 | Cable conductor temperature measuring device |
| CN109115278A (en) * | 2018-10-18 | 2019-01-01 | 国网山东省电力公司应急管理中心 | A kind of fine early warning system of GIS power grid based on cable sensor |
| CN112834066A (en) * | 2020-12-30 | 2021-05-25 | 深圳供电局有限公司 | Cable temperature detection device, system and method |
| CN113011015A (en) * | 2021-03-04 | 2021-06-22 | 国网浙江省电力有限公司嘉兴供电公司 | Safety control method for dynamic capacity increase of power transmission and transformation line |
| CN112985644A (en) * | 2021-05-18 | 2021-06-18 | 深圳市共济科技股份有限公司 | Bus duct abnormal temperature rise early warning method and system |
| CN114202875A (en) * | 2021-12-09 | 2022-03-18 | 江苏业力科技有限公司 | Fire early warning method based on logarithm inverse time limit principle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105300557A (en) | Cable conductor temperature measuring device and method | |
| CN106291201B (en) | Lightning monitoring and degradation state monitoring system and method for lightning protection box | |
| US10203293B2 (en) | Method for lightning stroke identification and location on optical fiber composite overhead ground wire | |
| CN103576052A (en) | System and method for determining direct-current system fault branch circuits needing to be in in-series connection with alternating currents | |
| CN102411119B (en) | Intelligent monitoring device for temperature and insulation state of 330KV high-voltage cable in hydropower station | |
| CN101533060B (en) | Power system fault pre-alarming method based on traveling wave electric amount measurement | |
| CN202815147U (en) | System for determining fault branch in which alternating current is connected in direct current system | |
| CN203894317U (en) | Online monitoring device used for leakage current of high-voltage cables | |
| CN103398740A (en) | Real-time on-line monitoring device for monitoring abnormal operation of switch cabinet | |
| CN103606909A (en) | Protecting system and method for power distribution network circuit | |
| CN104714142A (en) | CT and PT wire break detection method suitable for intelligent/digital transformer substation | |
| CN103941138A (en) | OPGW whole-wire monitoring and diagnosing system and method | |
| CN105628250A (en) | Power cable fault monitoring method based on grey GM(1,1) model | |
| CN205622318U (en) | Power consumption monitoring system and distribution network | |
| JP2014089998A (en) | Monitor system for photovoltaic power generation equipment | |
| CN103323119A (en) | Online temperature measuring system of high-voltage switch cabinet of transformer substation | |
| CN103779834B (en) | One is applied to distributed power generation grid integration counterflow-preventing intelligent detecting method | |
| CN206378569U (en) | A kind of voltage relay abnormal detector | |
| CN105241564A (en) | Bus temperature grading warning device | |
| CN105162409A (en) | Distributed photovoltaic grid-connected modularized power generation system embedded electricity stealing prevention device | |
| CN204498067U (en) | The insulation tester of photovoltaic DC cabinet | |
| CN205209644U (en) | Hierarchical alarm device of generating line temperature | |
| CN204374371U (en) | A kind of D.C. isolation monitoring device detects the failure alarm circuit of electric bridge | |
| CN103308770A (en) | Network system for power supply line impedance loss type electrical failure fire hazard detector | |
| CN209560060U (en) | Wall current monitoring device based on comprehensively control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160203 |
|
| WD01 | Invention patent application deemed withdrawn after publication |