CN105445586A - Load temperature rise test method for power cable for thermonuclear fusion - Google Patents

Load temperature rise test method for power cable for thermonuclear fusion Download PDF

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Publication number
CN105445586A
CN105445586A CN201510882309.2A CN201510882309A CN105445586A CN 105445586 A CN105445586 A CN 105445586A CN 201510882309 A CN201510882309 A CN 201510882309A CN 105445586 A CN105445586 A CN 105445586A
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China
Prior art keywords
load
power cable
conductor
temperature
equipment
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Pending
Application number
CN201510882309.2A
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Chinese (zh)
Inventor
阳文锋
陈善求
王瑞琪
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Gold Cup Electric Hengyang Cable Co Ltd
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Gold Cup Electric Hengyang Cable Co Ltd
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Application filed by Gold Cup Electric Hengyang Cable Co Ltd filed Critical Gold Cup Electric Hengyang Cable Co Ltd
Priority to CN201510882309.2A priority Critical patent/CN105445586A/en
Publication of CN105445586A publication Critical patent/CN105445586A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

Abstract

The invention discloses a load temperature rise test method for a power cable for thermonuclear fusion. The load temperature rise test method comprises the steps: utilizing load equipment to test a power cable which requires to be tested, wherein the power cable includes a conductor, and an insulating layer, a metal braid over braid shielding layer and an external protective layer are successively arranged at the periphery of the conductor; during the testing process, utilizing four groups of temperature displays to monitor the temperatures of the conductor, the insulating layer, the external protective layer and the environment, and utilizing two groups of time relays to perform switch control of the load equipment, wherein one group of time relays are set as 1000s and are under the equipment-on state and the other group of time relays are set as 2600s and are under the equipment-off state; and utilizing a pulse circulation method of the load 1800A, the load time 1000s and the zero load 2600s to carry out the test. The load temperature rise test method can accurately detect the stable performance shown by the power cable in the high temperature resistant and current impact resistant environment, and is suitable for a small sun project thermonuclear fusion system.

Description

A kind of load temperature-raising experimental method of thermofusion power cable
Technical field
The present invention relates to the load temperature-raising experimental method of thermofusion power cable.
Background technology
The plan of International Thermonuclear reactor experiment formally started on November 21st, 2006, and this plan is called as the maximum hope that the mankind finally solve energy crisis.EAST is much less in scale than International Thermonuclear reactor experiment, but both full superconduction on-circular cross-section tokamak devices.The successful operation of EAST, will make significant contribution for the plan of International Thermonuclear reactor experiment.This kind of thermofusion power cable need apply the operating mode of pulse current impact to cable, to cable load 1800A, duration of load application 1000s, unloaded 2600s, iterative cycles like this, so this type of cable needs to have the performances such as excellent high temperature resistant, anti-current impact, and show stable performance in the environment that must impact at high temperature resistant, anti-current, by current stabilization within the specific limits.Correlation technique is only studied stable current-carrying capacity, periodically current-carrying capacity before this, and in process of the test, testing precision is not very high, and this kind of pulse current impacts current-carrying capacity without correlative study.
Summary of the invention
The object of the invention is to the deficiency for existing method of testing and defect, provide a kind of load temperature-raising experimental method of thermofusion power cable, to solve the problem.
Technical matters solved by the invention can realize by the following technical solutions:
A load temperature-raising experimental method for thermofusion power cable, is characterized in that, comprise the steps:
Load equipment is utilized to test needing the power cable of test, power cable comprises conductor, insulation course is disposed with in conductor periphery, metallic braid screen layer and outer jacket, simulation is to power cable load 1800A, duration of load application 1000s, unloaded 2600s, during test, four groups of temperature indicators are utilized to monitor conductor respectively, insulation course, outer jacket and environment temperature, two groups of time relays are utilized to carry out switch control rule to load equipment, one group of time relay is set as 1000s, for opening of device state, another group time relay is set as 2600s, for device shutdown state, utilize load 1800A, duration of load application 1000s, the pulse cycle method of unloaded 2600s is tested.
In a preferred embodiment of the invention, load equipment and power cable junction are provided with four groups of contact resistance protective devices, to reduce the heat that contact resistance produces, avoid temperature distortion.
Owing to have employed technical scheme as above, the present invention accurately can detect in the environment that cable impacts at high temperature resistant, anti-current and show stable performance, is suitable for Sunny engineering thermofusion system.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, setting forth the present invention further below.
A load temperature-raising experimental method for thermofusion power cable, comprises the steps:
Load equipment is utilized to test needing the power cable of test, power cable comprises conductor, insulation course is disposed with in conductor periphery, metallic braid screen layer and outer jacket, simulation is to power cable load 1800A, duration of load application 1000s, unloaded 2600s, during test, four groups of temperature indicators are utilized to monitor conductor respectively, insulation course, outer jacket and environment temperature, two groups of time relays are utilized to carry out switch control rule to load equipment, one group of time relay is set as 1000s, for opening of device state, another group time relay is set as 2600s, for device shutdown state, utilize load 1800A, duration of load application 1000s, the pulse cycle method of unloaded 2600s is tested.
In order to reduce the heat that contact resistance produces, avoid temperature distortion, load equipment and power cable junction are provided with four groups of contact resistance protective devices.
Test sample preparation: get a finished cable 2-15m, two ends end peels off insulation and sheath 100mm expose conductor, in order to connecting electrode respectively; In the cable, equidistant 100mm place reserves cable conductor, insulation, sheath respectively in order to mounting temperature sensor, and coated closely for position similar insulation and the sheath material inserting sensor, contact firm.Then according to step below:
A. the cable prepared is put on the support of chamber, make cable unsettled.Cable is connected to load test tester two ends, and temp probe is placed in cable conductor, insulation, jacket surface and environment respectively, each point initial temperature.
B. transformer current is adjusted to 1800 (+100 ,-0), load time relay is adjusted to 1000s, and idle time, relay was adjusted to 2600s, counter O reset.Gauge tap is adjusted to external control simultaneously.
C. power switch is started, when recording each time relay redirect, cable conductor, insulation, sheath, environment temperature.
Following method is adopted to test:
Complete load 1800A, duration of load application 1000s, the theoretical and experimental investigations that unloaded 2600s pulse current changes cable temperature rise, set up pulse current model:
1. conductor temperature (ignoring heat dispersal situations) after first load
Temperature is identical and equal environment temperature everywhere to suppose cable, conductor temperature when calculating end-of-pulsing according to insulating model:
θf1=θ0+(I2Rt/ΣCM)
In examination: θ f1 is conductor initial temperature, I load cable,
R conductor resistance, t duration of load application, C material thermal capacitance, M material weight.
2. calculate the front conductor temperature of second pulse arriving
Cable is by after initial pulse, and conductor no longer produces new heat, and start outwards to dispel the heat, conductor temperature declines, and sets up single order Transient Thermal Circuit model according to lumped parameter method.
Equivalent thermal resistance: Teq=T1+T2+T3+T4
Equivalence thermal capacitance: Qeq=3Qc+0.5 × (Qi+Qs+Qj)
Thermal time constant: τ=Teq × Qeq
Corresponding according to cable single order hot road zero condition, bring calculating into: θ L1=θ 0+ θ f1e-t/ τ
In examination: θ 0 is environment temperature, temperature when θ f1 is this end-of-pulsing, T1, T2, T3, T4 are respectively insulation, inner sheath, sheath, environment thermal resistance, and Qc, Qi, Qs, Qj are respectively conductor, insulation, inner sheath, sheath thermal capacitance.
3. iterative computation solves steady temperature
Double counting the 2nd time, 3 times, 4 times and even n subpulse are changed by rear cable temperature according to the method described above, until θ L and θ f restrains and stationary value substantially.
4., by calculating, as table 1, θ L and θ f stablizes at 59.4 DEG C and 42.1 DEG C of convergences
Concrete test findings can see table 1
Table 1
Can be obtained by above-mentioned table 1, can be learnt in the environment that thermofusion power cable impacts at high temperature resistant, anti-current by test method of the present invention and show stable performance, by current stabilization within the specific limits, stablize at 59.4 DEG C and 42.1 DEG C of convergences, be suitable for Sunny engineering thermofusion system.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.

Claims (2)

1. a load temperature-raising experimental method for thermofusion power cable, is characterized in that, comprise the steps:
Load equipment is utilized to test needing the power cable of test, power cable comprises conductor, insulation course is disposed with in conductor periphery, metallic braid screen layer and outer jacket, simulation is to power cable load 1800A, duration of load application 1000s, unloaded 2600s, during test, four groups of temperature indicators are utilized to monitor conductor respectively, insulation course, outer jacket and environment temperature, two groups of time relays are utilized to carry out switch control rule to load equipment, one group of time relay is set as 1000s, for opening of device state, another group time relay is set as 2600s, for device shutdown state, utilize load 1800A, duration of load application 1000s, the pulse cycle method of unloaded 2600s is tested.
2. the load temperature-raising experimental method of a kind of thermofusion power cable as claimed in claim 1, is characterized in that, load equipment and power cable junction are provided with four groups of contact resistance protective devices.
CN201510882309.2A 2015-12-03 2015-12-03 Load temperature rise test method for power cable for thermonuclear fusion Pending CN105445586A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510882309.2A CN105445586A (en) 2015-12-03 2015-12-03 Load temperature rise test method for power cable for thermonuclear fusion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510882309.2A CN105445586A (en) 2015-12-03 2015-12-03 Load temperature rise test method for power cable for thermonuclear fusion

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CN105445586A true CN105445586A (en) 2016-03-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110208627A (en) * 2019-06-20 2019-09-06 应急管理部四川消防研究所 A kind of overcurrent ignition source prevention and control device fire prevention and control aptitude tests method

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CN103336023A (en) * 2013-06-04 2013-10-02 华南理工大学 Calculation method of thermal resistance of power cable
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CN101887769A (en) * 2010-06-30 2010-11-17 无锡市明珠电缆有限公司 Cable for high-power pulse source
CN201868135U (en) * 2010-12-07 2011-06-15 衡阳恒飞电缆有限责任公司 Seabed optical fiber composite high-voltage cable with detecting function
CN103336023A (en) * 2013-06-04 2013-10-02 华南理工大学 Calculation method of thermal resistance of power cable
CN105044571A (en) * 2015-07-10 2015-11-11 西安交通大学 Distribution cable comprehensive condition online monitoring system and method with self-powered function
CN204855025U (en) * 2015-07-16 2015-12-09 河北省电力勘测设计研究院 Be used for cable intermediate head temperature field measuring temperature measurement testing system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110208627A (en) * 2019-06-20 2019-09-06 应急管理部四川消防研究所 A kind of overcurrent ignition source prevention and control device fire prevention and control aptitude tests method

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