CN105866564A - Cable core temperature inversion formula examination method and apparatus thereof - Google Patents
Cable core temperature inversion formula examination method and apparatus thereof Download PDFInfo
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- CN105866564A CN105866564A CN201610154377.1A CN201610154377A CN105866564A CN 105866564 A CN105866564 A CN 105866564A CN 201610154377 A CN201610154377 A CN 201610154377A CN 105866564 A CN105866564 A CN 105866564A
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- cable
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- retrieval formula
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Electric Cable Installation (AREA)
Abstract
The invention relates to a cable core temperature inversion formula examination method and an apparatus thereof. The method comprises the following steps of step (1), filling dry soil into a rectangle wooden box and laying a cable in the soil in the wooden box; step (2), using a thermocouple temperature measurement module to measure a temperature of the cable and measuring a cable core temperature and a cable surface temperature of the cable respectively; step (3), connecting the cable to a rated current I, and measuring temperature data of the cable core temperature T1 and the cable surface temperature T2 of the cable; step (4), through a computer, fitting I, T1 and T2 recording values through a thermal path parameter fitting procedure and obtaining an optimal fitting thermal parameter; step (5), calculating a cable core temperature T1' when the cable is in a zero original state under a current simulation laying environment and comparing an inversion calculating value T1' and the measured value T1. The method and the apparatus have advantages that temperature changes when the cable actually operates can be simulated and rationality of a cable core inversion method can be accurately and effectively verified.
Description
Technical field
The present invention relates to cable temperature fields of measurement, particularly relate to the inspection of a kind of cable conductor temperature retrieval formula
Method and device.
Background technology
Cable directly buried installation is common system of laying, and cable temperature is the straight of its current-carrying capacity of decision
Connect one of factor, when applying electric current and being too high, make cable operating temperature be higher than safety value, accelerate
Cable insulation aging, cause potential safety hazard.When applying electric current and being too low, cause cable and pass
The waste of defeated capacity.Calculate cable temperature and judge that transmission capacity is whether reasonable, to cable economy and
Safe operation is significant.Generally, the maximum transfer capacity of cable is by it
High that allow temperature decision, cable temperature highest point is positioned at cable core.But, the most current
For technology, it is difficult to directly measure the temperature of high-tension cable cable core.Therefore, solution is needed now badly
Be design a kind of cable conductor temperature retrieval research method and device.
Summary of the invention
Present invention aim to overcome that the deficiency of above prior art, propose a kind of cable conductor temperature retrieval public
The method of inspection of formula and device, specifically realized by techniques below scheme:
The method of inspection of described cable conductor temperature retrieval formula, including:
Step (1), loads dry soil, in a cuboid wooden case by cable laying in described wooden case
In soil；
Step (2) passes through thermocouple G1Measure the core temperature of cable, by thermocouple G2Measure cable surface
Temperature；
Cable is connected rated current, the core temperature T of record cable by step (3)1With cable surface temperature T2's
Temperature data；
Step (4) is passed through cable testing electric current I, T on computer1, T2Record value is intended by hot road parameter
Conjunction program matching, obtains optimal fitting thermal parameter；
Thermal parameter is brought in cable conductor inversion formula by step (5), tries to achieve present day analog and lays under environment
Cable is in cable conductor temperature during zero original state, and by T1' Inversion Calculation value T1' and measured value T1Work compares
Relatively, if error is less than 10%, then cable conductor inversion formula is correct.
The design further of the method for inspection of described cable conductor temperature retrieval formula is, described method is in step
(5) carrying out Test of accuracy experiment after, the experiment of described Test of accuracy includes
Underload experiment: apply the electric current less than rated current-carrying capacity 20% to cable, inspection cable is in state under load
Time, cable conductor temperature retrieval formula possesses accuracy；
Overload experiment: be applied more than the electric current of rated current-carrying capacity 20% to cable, inspection cable is in overload
Time, cable conductor temperature retrieval formula possesses accuracy.
The further design of the method for inspection of described cable conductor temperature retrieval formula is, described step 1) in cable
The system of laying of direct-burried is used in soil.
The design further of the method for inspection of described cable conductor temperature retrieval formula is, described step 2) in
When cable is measured temperature, measure the cable temperature in the middle part of wooden case.
The design further of the method for inspection of described cable conductor temperature retrieval formula is, described step 3) in
Every the core temperature T of cable of one minute record after cable runs 10h1With cable surface temperature T2Temperature
Degrees of data.
The design further of the method for inspection of described cable conductor temperature retrieval formula is, described step 3) in
Direct-burried time cable rated current-carrying capacity be about 700A.
The method of inspection of cable conductor temperature retrieval formula as mentioned, it is provided that a kind of cable conductor temperature retrieval is public
The verifying attachment of formula, including:
Rising current transformer, for regulating the electrical current of cable；
Pressure regulator, for regulating the voltage of cable；
Switch cubicle, is connected to form controlling brancher by pressure regulator with controlling rising current transformer, is used for controlling, protecting inspection
Device；
Wooden case, internal reservoir has soil, and described soil is used for cabling, laying during to simulate actual cable direct-burried
Situation；
Thermocouple temperature measurement module, is connected with cable in being located at wooden case, measures the cable core of cable and the temperature of cable surface；
Current transformer, obtains the test current of cable；
Control system, adjusts the voltage electric current with control cable loop of pressure regulator, and real time record temperature measurement module obtains
Cable temperature summation current transformer obtain electric current.
The further design of the verifying attachment of described cable conductor temperature retrieval formula is, described experiment wooden case in
Cuboid, a length of 2.4 meters, a width of 0.8 meter, a height of 1.2 meters, the soil aggregate depth in case 0.7 meter, cable
Deep 0.3 meter of the soil in bottom.
The design further of the verifying attachment of described cable conductor temperature retrieval formula is, also includes for stable
The compensation electric capacity of verifying attachment, described compensation electric capacity is connected between pressure regulator and switch cubicle, is used for compensating described control
Branch road processed.
Advantages of the present invention is as follows:
1. the method for the present invention is reasonable in design, it is possible to temperature change during dummycable actual motion, accurately and effectively
The reasonability of checking cable conductor inversion method.
2. assembly of the invention is simple to operate, it is simple to the multiple authentication of cable conductor inversion method.
3. assembly of the invention volume is little, powerful, it is easy to mobile, measures accurately.
4. assembly of the invention can simulate the actual motion temperature change of cable under different soils, extensively fits
For verifying the cable conductor inversion method under different soils.
Accompanying drawing explanation
The schematic diagram of the verifying attachment of Fig. 1 cable conductor temperature retrieval formula.
Fig. 2 cable scheme of installation.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail, it is noted that described embodiment only purport
It is being easy to the understanding of the present invention, and it is not being played any restriction effect.
The method of inspection of the cable conductor temperature retrieval formula of the present embodiment, specifically includes following steps:
Cable is placed in the wooden case of long 2.4m, wide 0.8m, high 1.2m by step (1), built-in at wooden case
Fill out the soil of dry In Yichang Area, Hubei Province, laying state during simulation actual cable direct-burried.In wooden case, soil is total
Deep 0.7m, the deep 0.3m of soil bottom cable, cable mounting means is as shown in Figure 2.
Step (2) uses thermocouple temperature measurement module to measure cable temperature, wherein thermocouple T1Measure electricity
The core temperature of cable, T2Measure cable surface temperature.Less by ectocine, with electricity in view of in the middle part of wooden case
Actual conditions during cable direct-burried are more closely, measure the cable temperature in the middle part of wooden case when testing.
Step (3) passes to rated current to cable, the core temperature T of cable after cable operation 10h1And cable
Surface temperature T2Basically reach stable state.A temperature data is recorded during this period every one minute.This enforcement
Example is set as 700A.
Step (4) on the computer that CPU is Pentium 2.0GHz by test current I, T1, T2Record
Value rated current, by the parameter fit-procedure matching of hot road, obtains optimal fitting thermal parameter.
Thermal parameter is brought in cable conductor inversion formula by step (5), tries to achieve cable when being in zero original state,
That is simulated in laboratory lays under environment, cable conductor temperature T1', and by Inversion Calculation value T1' and measured value T1
Make comparisons.
Step (6) carries out underload experiment to test platform, applies the electricity less than rated current-carrying capacity 20% to cable
Stream, i.e. 500A carry out cable underload temperature rise experiment, inspection cable when underload, cable conductor temperature retrieval
The accuracy of formula.
Step (7) carries out overload experiment to test platform, is applied more than the electricity of rated current-carrying capacity 20% to cable
Stream, i.e. 850A carries out the temperature rise experiment of cable overload, and during inspection cable overload, cable conductor temperature retrieval is public
The validity of formula.
The method of inspection of the cable conductor temperature retrieval formula of the present embodiment is reasonable in design, it is possible to dummycable is actual
Temperature change during operation, verifies the reasonability of cable conductor inversion method accurately and effectively.
As the method for inspection of cable conductor temperature retrieval formula, it is provided that a kind of cable conductor temperature retrieval formula
Verifying attachment, this verifying attachment is mainly by rising current transformer, pressure regulator, switch cubicle, wooden case, thermocouple temperature measurement
Module, current transformer and control system composition.Rising current transformer, for regulating the electrical current of cable.
Pressure regulator, for regulating the voltage of cable.Switch cubicle, is connected to form with controlling rising current transformer by pressure regulator
Controlling brancher, is used for controlling, protecting verifying attachment.Wooden case, internal reservoir has soil, soil to be used for laying electricity
Cable, to simulate laying state during actual cable direct-burried.Thermocouple temperature measurement module, connects with cable in being located at wooden case
Connect.Thermocouple temperature measurement module is by thermocouple G1With thermocouple G2Composition, thermocouple G1Measure the cable core temperature of cable
Degree, G2Measure cable surface temperature.Current transformer, obtains the test current of cable.Control system, adjusts
The voltage of whole pressure regulator with control cable loop electric current, and real time record temperature measurement module obtain cable temperature and
The electric current that current transformer obtains.
Concrete combination Fig. 1, the region one in figure is high-voltage operation region, including rising current transformer, pressure regulator,
Compensate electric capacity, switch cubicle.Region two, for low voltage control measured zone, including experiment wooden case, thermocouple temperature measurement
Module, current transformer and control system.
Further design is, tests the rectangular body of wooden case, a length of 2.4 meters, a width of 0.8 meter, a height of 1.2
Rice, the soil aggregate depth in case 0.7 meter, deep 0.3 meter of soil bottom cable.
In order to increase the stability of test platform voltage, the present embodiment additionally uses the benefit for stability checking device
Repay electric capacity.This compensation electric capacity is connected between pressure regulator and switch cubicle, is used for compensating controlling brancher.
The verifying attachment of the cable conductor temperature retrieval formula of the present embodiment is simple to operate, it is simple to cable conductor inversion method
Multiple authentication.On the other hand, this device volume is little, powerful, it is easy to mobile, measures accurately, it is possible to
Simulation actual motion temperature change of cable under different soils, is widely used in verifying the cable under different soils
Cable core inversion method.
Claims (9)
1. the method for inspection of a cable conductor temperature retrieval formula, it is characterised in that including:
Step (1), loads dry soil, by cable laying in institute in a cuboid wooden case
State in the soil in wooden case；
Step (2) passes through thermocouple G1Measure the core temperature of cable, by thermocouple G2Survey
Amount cable surface temperature；
Cable is connected rated current, the core temperature T of record cable by step (3)1And cable
Surface temperature T2Temperature data；
Step (4) is passed through the test current I, T of cable on computer1, T2Record value passes through
The parameter fit-procedure matching of hot road, obtains optimal fitting thermal parameter；
Thermal parameter is brought in cable conductor inversion formula by step (5), tries to achieve present day analog and applies
If the cable under environment is in cable conductor temperature T during zero original state1', and by Inversion Calculation
Value T1' and measured value T1Making comparisons, if error is less than 10%, then checking cable conductor inverting is public
Formula is correct.
The method of inspection of cable conductor temperature retrieval formula the most according to claim 1, its feature
Being that described method carries out Test of accuracy experiment after step (5), described accuracy is examined
Test experiment to include
Underload experiment: apply the electric current less than rated current-carrying capacity 20% to cable, at inspection cable
When state under load, cable conductor temperature retrieval formula possesses accuracy；
Overload experiment: be applied more than the electric current of rated current-carrying capacity 20% to cable, at inspection cable
When overload, cable conductor temperature retrieval formula possesses accuracy.
The method of inspection of cable conductor temperature retrieval formula the most according to claim 1, its feature
Be described step 1) in cable in soil, use the system of laying of direct-burried.
The method of inspection of cable conductor temperature retrieval formula the most according to claim 1, its feature
Be described step 2) in time cable is measured temperature, measure the cable temperature in the middle part of wooden case.
The method of inspection of cable conductor temperature retrieval formula the most according to claim 1, its feature
Be described step 3) in run after 10h the cable every cable of one minute record at cable
Core temperature T1With cable surface temperature T2Temperature data.
The method of inspection of cable conductor temperature retrieval formula the most according to claim 1, its feature
Be described step 3) in direct-burried time cable rated current-carrying capacity be about 700A.
7. the method for inspection of the cable conductor temperature retrieval formula as described in any one of claim 1-6
The verifying attachment of a kind of cable conductor temperature retrieval formula, it is characterised in that including:
Rising current transformer, for regulating the electrical current of cable；
Pressure regulator, for regulating the voltage of cable；
Switch cubicle, is connected to form controlling brancher by pressure regulator with controlling rising current transformer, be used for controlling,
Protection verifying attachment；
Wooden case, internal reservoir has soil, and described soil is used for cabling, straight to simulate actual cable
Laying state when burying；
Thermocouple temperature measurement module, is connected with cable in being located at wooden case, measures cable core and the cable meter of cable
The temperature in face；
Current transformer, obtains the test current of cable；
Control system, adjusts the voltage electric current with control cable loop of pressure regulator, and real time record is surveyed
The electric current that the cable temperature summation current transformer that temperature module obtains obtains.
The verifying attachment of cable conductor temperature retrieval formula the most according to claim 7, its feature
It is the described rectangular body of experiment wooden case, a length of 2.4 meters, a width of 0.8 meter, a height of 1.2 meters,
Soil aggregate depth in case 0.7 meter, deep 0.3 meter of soil bottom cable.
The verifying attachment of cable conductor temperature retrieval formula the most according to claim 7, its feature
Being also to include the compensation electric capacity for stability checking device, described compensation electric capacity is connected to pressure regulator
And between switch cubicle, it is used for compensating described controlling brancher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610154377.1A CN105866564A (en) | 2016-03-17 | 2016-03-17 | Cable core temperature inversion formula examination method and apparatus thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610154377.1A CN105866564A (en) | 2016-03-17 | 2016-03-17 | Cable core temperature inversion formula examination method and apparatus thereof |
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| Publication Number | Publication Date |
|---|---|
| CN105866564A true CN105866564A (en) | 2016-08-17 |
Family
ID=56625502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610154377.1A Pending CN105866564A (en) | 2016-03-17 | 2016-03-17 | Cable core temperature inversion formula examination method and apparatus thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044167A (en) * | 2018-10-12 | 2020-04-21 | 维谛技术有限公司 | Method and device for determining temperature of capacitor core |
| CN112462202A (en) * | 2021-01-26 | 2021-03-09 | 湖北鑫英泰系统技术股份有限公司 | Power grid load early warning method and system based on high-voltage passive temperature measurement |
| CN115758047A (en) * | 2022-11-18 | 2023-03-07 | 西南交通大学 | Method for calculating temperature of directly-buried 10kV cable core based on electric heat conversion coefficient |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044167A (en) * | 2018-10-12 | 2020-04-21 | 维谛技术有限公司 | Method and device for determining temperature of capacitor core |
| CN111044167B (en) * | 2018-10-12 | 2021-10-26 | 维谛技术有限公司 | Method and device for determining temperature of capacitor core |
| CN112462202A (en) * | 2021-01-26 | 2021-03-09 | 湖北鑫英泰系统技术股份有限公司 | Power grid load early warning method and system based on high-voltage passive temperature measurement |
| CN115758047A (en) * | 2022-11-18 | 2023-03-07 | 西南交通大学 | Method for calculating temperature of directly-buried 10kV cable core based on electric heat conversion coefficient |
| CN115758047B (en) * | 2022-11-18 | 2024-03-12 | 西南交通大学 | Calculation method for temperature of cable core of direct-buried 10kV cable based on electrothermal conversion coefficient |
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Legal Events
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| CB02 | Change of applicant information |
Address after: 210008 No. 215, Shanghai Road, Nanjing, Jiangsu Applicant after: NANJING ELECTRIC POWER ENGINEERING DESIGN CO., LTD. Applicant after: ECONOMIC AND TECHNOLOGY RESEARCH INSTITUTE, STATE GRID JIANGSU ELECTRIC POWER COMPANY Applicant after: China Three Gorges University Applicant after: State Grid Corporation of China Address before: 210008 No. 215, Shanghai Road, Nanjing, Jiangsu Applicant before: NANJING ELECTRIC POWER ENGINEERING DESIGN CO., LTD. Applicant before: Jiangsu Electric Power Company Economic Research Institute Applicant before: China Three Gorges University Applicant before: State Grid Corporation of China |
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| COR | Change of bibliographic data | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160817 |
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| RJ01 | Rejection of invention patent application after publication |