CN110069804A - A kind of hot-spot faulty physical defect detecting device - Google Patents
A kind of hot-spot faulty physical defect detecting device Download PDFInfo
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- CN110069804A CN110069804A CN201910023071.6A CN201910023071A CN110069804A CN 110069804 A CN110069804 A CN 110069804A CN 201910023071 A CN201910023071 A CN 201910023071A CN 110069804 A CN110069804 A CN 110069804A
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Abstract
The invention belongs to electric high pressure gas equipment operation condition on-line monitoring technique fields, and in particular to a kind of hot-spot faulty physical defect detecting device, including cylindrical shell；The nickel molybdenum aluminium heating wire of the heat source as POF physical imperfection in cylindrical shell is set；Shell of 304 stainless steels as thermode is chosen, while selecting K-type thermocouple as measurement POF physical imperfection model and SF6The temperature sensor of contact surface temperature；POF physical imperfection model stainless steel casing inner surface is fixed on using by the burial of K-type thermocouple；The present invention can be with Simulated GlS equipment inside contact hot-spot failure as caused by poor contact, for studying the fault characteristic of POF, carrying out the monitoring of POF On-line Fault and guaranteeing that safe operation of power system has far-reaching significance.
Description
Technical field
The invention belongs to electric high pressure gas equipment operation condition on-line monitoring technique fields, and in particular to a kind of hot-spot
Property faulty physical defect detecting device.
Background technique
With sulfur hexafluoride gas (SF6) as the gas-insulated of insulation and arc-extinguishing medium equipment (gas-insulated combined electric
GIS, gas-insulated transformer GIT, gas-insulated lines GIL etc.), rapidly develop and be widely used in the high pressure of electric system
With ultra-high/extra-high voltage field, become the preferred unit of modern substation.But work as SF6Gas-insulated equipment is internal to be existed as contacted
The defects of bad, magnetic saturation or when overload fault, the thermal stability of rejected region will be destroyed, SF6Gas-insulated equipment part
, there is hot-spot failure (Partial Overthermal Fault, POF) in overheat.
These early stage hot-spots Damage to insulation material, the damage of insulating materials can aggravate local mistake to some extent again
Heat, so that forming vicious circle, may finally lead to insulation breakdown or ablation to further speed up the deterioration of insulating materials,
It is likely to result in large-scale power failure, large effect will cause to the normal operation of power grid.Due to SF6Gas-insulated equipment
All-sealed structure make the execution of fault location and service work extremely difficult；Compared with other conventional equipments, after accident
The average interruption maintenance time it is longer, scope of power outage is bigger, is often related to non-faulting element.
The hot-spot failure (POF) for carrying out experiment simulation truth studies POF to SF6As insulation and arc extinguishing
The gas-insulated of medium equips the resolution characteristic under overheating fault, is that the monitoring of solution high voltage electric equipment overheating fault is asked
Topic, the only way of prevention POF development.The experimental provision that hot-spot failure (POF) is simulated in experimental study, is to grind
Study carefully the core apparatus of dielectric overheating fault characteristic and the difficult point of simulated experiment.
It is perfect not enough for simulating the experimental system research of POF failure both at home and abroad at present.Both at home and abroad to SF6Cross thermal decomposition
Phenomenal research is seldom, and only in the eighties in last century, external some scholars are to SF6Thermal stability and its decomposition product etc. carry out
It tentatively probes into, but is limited by detection technique at that time and experimental provision, the accuracy of many conclusions also needs further to be tested
Card.On the one hand, the SF as gas-insulated equipment primary insulation medium and heat eliminating medium6Gas and traditional paper oil insulation system
System is compared, and radiating condition is more severe, is designed according to E class B insulation, i.e., averagely allowing temperature rise is that (highest allows to run 80K
Temperature is 120 DEG C), the running temperature allowed is higher；On the other hand, as main conductor material in gas-insulated equipment
Material --- the fusing point of aluminium is 660 DEG C, in order to simulate SF6Resolution characteristic and its decomposition mechanism under the effect of POF localized hyperthermia,
Therefore, the physical imperfection model needs of designed simulation POF can generate the high-temperature effect (120 DEG C~660 DEG C) of POF.Together
When, also requirement cannot make overheat sealed gas chamber bulk temperature excessively high, avoid causing to overheat sealed gas chamber cavity inner wall and SF6Gas
Body reacts, therefore to the design requirement small volume of POF physical imperfection model, local specific to POF to generate with this
High-temperature effect.But if when POF physical imperfection model volume is too small, will lead to heating wire generation heat excessively concentrate and
Keep heating wire temperature excessively high and be finally blown, therefore, can not arbitrarily reduce the volume of POF physical imperfection model.This
Outside, the physical imperfection model for also requiring test used has certain tolerance high temperature capabilities, and enclosure material can simulate SF6Gas
Material (the silver-plated connector of aluminum largely used in the silicon steel material of such as GIT iron core, GIS and GIL at insulation equipment easily hair POF
Deng), while can also real-time and accurate measurement POF physical imperfection model and SF6The actual temperature of direct contact surface.So if
A set of suitable POF physical imperfection model for meeting requirements above is counted, for studying the fault characteristic of POF, carries out POF failure
It monitors on-line and guarantees that safe operation of power system has far-reaching significance.
Summary of the invention
The purpose of the present invention is in the experiment of existing POF fault simulation, in order to which researching high-temperature acts on lower SF6Point
Characteristic and its decomposition mechanism are solved, the temperature of entire gas chamber is controlled, guarantees the complete of other devices such as gas tank, conducting wire and experiment
Electrical equipment hot-spot failure is simulated in safety, is realized the accurate control to POF, is studied the mistake thermal characteristics of dielectric.
Basis is provided for the monitoring of POF On-line Fault.
The technical scheme is that
A kind of hot-spot faulty physical defect detecting device, feature include:
In order to simplify influence factor, the shell shape of physical imperfection model is using cylindrical.
Heat source of the nickel molybdenum aluminium heating wire as POF physical imperfection is selected, has many advantages, such as that heating power is big, fusing point is high；
Shell of 304 stainless steels as thermode is chosen, while selecting K-type thermocouple as measurement POF physical imperfection mould
Type and SF6The temperature sensor of contact surface temperature.K-type thermocouple has detection range wide, and heat-resisting ability is strong, detection accuracy
The advantages that high.
In order to improve to POF physical imperfection model and SF6The response speed and detection accuracy of contact surface temperature measurement, are adopted
POF physical imperfection model stainless steel casing inner surface is fixed on by the burial of K-type thermocouple.
It is filled inside physical imperfection model with the magnesia (MgO) of chemical property stabilization, high temperature resistant, good heat-transfer, two
End is packaged again with the stable ceramics of chemical property, to guarantee leakproofness.
Physical imperfection model diameter 6mm, the long 60mm of designed simulation POF.The physical imperfection model is electroplated
Processing can simulate crossing at unlike material i.e. different faults point and thermally decompose, such as silver-plated to be connect with Simulated GlS and GIL because of contact
Touching bad fever leads to SF6It decomposes.
Suitable heating power is selected, avoids sealed gas chamber cavity due to temperature is excessively high and SF6React is entirely to be
The needs of system consider the problems of emphatically.Here is the heating power and outer dimension and sealed gas chamber to POF physical imperfection model
The calculating that relationship between cavity temperature carries out.
The present invention can be with Simulated GlS equipment inside contact hot-spot failure as caused by poor contact, for grinding
Study carefully the fault characteristic of POF, carry out the monitoring of POF On-line Fault and guarantees that safe operation of power system has far-reaching significance.
Detailed description of the invention
Fig. 1 is POF physical imperfection model internal structure schematic diagram.
Specific embodiment
The maximum operating temperature for taking sealed gas chamber cavity to allow is 70 DEG C, under the maximum operating temperature, both can guarantee close
Chamber of holding one's breath body not with SF6Gas chemically reacts, while also ensuring the safety of experimenter.To guarantee testing
The temperature of sealed gas chamber cavity is no more than 70 DEG C in journey, needs to guarantee that the heat radiation power of sealed gas chamber chamber outer wall is higher than POF
The maximum heat radiation power of physical imperfection model.Since sealed gas chamber main body uses cylindrical structure, for convenience of calculating, ignore close
It holds one's breath the influence of each interface on room, the cylinder placed vertically can be reduced to.Due to during the experiment, testing closed
The radiation processes of gas chamber and POF physical imperfection model are all solid dielectrics to ambient enviroment (gas) dissipated heat, which dissipates
Mistake process mainly includes heat loss through radiation and heat loss through convection, below to the heat loss through radiation and heat loss through convection power under both of these case
Carry out theoretical calculation.
1) heat loss through radiation power
Arbitrary objects can be by this spy fence-Boltzmann law (Stefan-Boltzmann to the radiant power of ambient enviroment
Law it) calculates:
Qr=ε σ AT4
In formula, QrFor the radiant power of thermal objects；ε is thermal objects surface heat rate, and value range is 0~1；σ
For this special fence-Boltzmann constant, value is 5.6697 × 10-8W/(m2·K4)；A is the surface area of thermal objects.
2) heat loss through convection power
When the projecting environment temperature of object temperature, Natural Heat Convection mistake will be carried out between ambient enviroment
Journey, the heat loss through convection power can be obtained by theoretical calculation.It can be calculated the qualitative temperature t of high temp objects by formulam:
In formula, tsFor high temp objects surface temperature, t∞For object local environment temperature.Then pass through inquiry gas physical property
Table determines the gas physics value of high temp objects local environment, further calculates the Grashof number G that can obtain environmental gasrm, meter
Calculate formula are as follows:
In formula, νmFor viscosity, unit m2/s；G represents acceleration of gravity；β is the coefficient of expansion of gas.So
The free convection average heat transfer coefficient N of high temp objectsumAre as follows:
Num=C (GrmPrf)M
Wherein, the value of C, M can be by tabling look-up to obtain.And then high temp objects surface heat loss through convection power Q can be obtainedcAre as follows:
In formula, λmFor the thermal coefficient of environmental gas, unit is W/ (mK).
When calculating heat radiation power of the sealed gas chamber to ambient enviroment, since sealed gas chamber content is gas, experiment
When, gas chamber upper temp outline is higher than temperature of lower, to simplify the calculation, it is believed that sealed gas chamber chamber outer surface temperature is along axial
Even variation, by the surface state of sealed gas chamber cavity material, taking its surface heat rate ε is 0.3, when sealed gas chamber top is
At 70 DEG C of maximum temperature, the radiant power Q under a series of above-mentioned hypothesis is obtained by calculationrFor 76.4W.In other words, exist
In the case of above-mentioned hypothesis, when sealed gas chamber operating temperature reaches maximum operating temperature, its heat loss through radiation power is
76.4W。
Assuming that during the experiment, constant environment temperature is 25 DEG C (298K).So the temperature range of sealed gas chamber with
It is 25 DEG C~70 DEG C known to i.e..Once experiment, the temperature of sealed gas chamber will be above 25 DEG C, and therefore, sealed gas chamber cavity will
Due to the projecting environment temperature of its outside wall temperature, there are free convection cooling procedures between ambient enviroment.For convenience
It calculates, taking sealed gas chamber operating temperature is 47.5 DEG C of its average operating temperature, and then can obtain its tmFor 36.3 DEG C (309.3K),
Under normal temperature and pressure conditions, the Grashof number G of airrmIt is 7.525 × 107, and Grm×Prm=5.795 × 107.By tabling look-up
The value for obtaining C, M is respectively as follows: C=0.59, M=0.25, so as to obtain Num=50.28, it can further obtain the convection current of sealed gas chamber
Heat radiation power QcFor 22.7W.And then sealed gas chamber is obtained to the heat radiation power of ambient enviroment, i.e. Qb=Qr+Qc=99.1W.
Since the heat of sealed gas chamber cavity is all from POF physical imperfection model, thus, it is ensured that sealed gas chamber
The temperature of containment portion is no more than 70 DEG C, then Q of the heat radiation power Q of POF physical imperfection model no more than sealed gas chamberbIt dissipates
Thermal power 99.1W.When designed POF physical imperfection model radius be 3mm, length 60mm, take its surface heat rate ε
It is 0.1, when fever temperature is 660 DEG C (933K, as designed highest simulated failure temperature), POF physical imperfection mould
The heat loss through radiation power of type is 5.35W.
Since POF physical imperfection model is located in sealed gas chamber cavity, internal punching is with the SF of 0.4Mpa6, in design pole
Under the conditions of limit, i.e., when defect model surface temperature is 660 DEG C (933K), environment temperature is 25 DEG C (298K), then its qualitative temperature
For tmFor 342.5 DEG C (615.5K), by can be calculated SF at this time6The G of gasrmIt is 2.758 × 1010, thus Grm×Prm
=1.933 × 1010；By tabling look-up to obtain the value of C, M are as follows: C=0.1, M=1/3, to obtain N under this conditionumFor
268.38, further obtaining its heat loss through convection power is 54.55W.Therefore, designed POF physical imperfection model is designed
Maximum operating temperature under be 59.9W to the heat radiation power of ambient enviroment, the limit less than sealed gas chamber chamber outer wall radiates
Power, because can satisfy requirement of experiment without making sealed gas chamber cavity temperature more than 70 DEG C of maximum permissible temperature.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention
The technical staff in field can make various modifications or additions to the described embodiments or by a similar method
Substitution, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (3)
1. a kind of hot-spot faulty physical defect detecting device characterized by comprising cylindrical shell；It is arranged in circle
The nickel molybdenum aluminium heating wire of the heat source as POF physical imperfection in cylindrical outer cover；
Choose shell of 304 stainless steels as thermode, at the same select K-type thermocouple as measurement POF physical imperfection model with
SF6The temperature sensor of contact surface temperature；POF physical imperfection model stainless steel casing is fixed on using by the burial of K-type thermocouple
Inner surface；
It is filled inside detection device with the magnesia (MgO) of chemical property stabilization, high temperature resistant, good heat-transfer, both ends are again to change
It learns the stable ceramics of property to be packaged, to guarantee leakproofness.
2. a kind of hot-spot faulty physical defect detecting device according to claim 1, which is characterized in that designed
Simulation POF physical imperfection model diameter 6mm, long 60mm；The physical imperfection model is subjected to electroplating processes, can be simulated not
Crossing at same material, that is, different faults point thermally decomposes, and such as silver-plated can be generated heat with Simulated GlS and GIL because contact is bad causes
SF6It decomposes.
3. a kind of hot-spot faulty physical defect detecting device according to claim 1, which is characterized in that selection is closed
Suitable heating power avoids sealed gas chamber cavity due to temperature is excessively high and SF6React is that whole system needs to resit an exam
The problem of worry；Here is between heating power and outer dimension and sealed gas chamber cavity temperature to POF physical imperfection model
The calculating that relationship carries out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910023071.6A CN110069804A (en) | 2019-01-10 | 2019-01-10 | A kind of hot-spot faulty physical defect detecting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910023071.6A CN110069804A (en) | 2019-01-10 | 2019-01-10 | A kind of hot-spot faulty physical defect detecting device |
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| CN110069804A true CN110069804A (en) | 2019-07-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112765861A (en) * | 2020-12-30 | 2021-05-07 | 广东电网有限责任公司电力科学研究院 | Method and system for acquiring temperature characteristic curve of overheating defect of high-voltage switch equipment |
| CN113237920A (en) * | 2021-05-17 | 2021-08-10 | 西南交通大学 | Method for detecting fault heat source of valve-side sleeve of extra-high voltage converter transformer |
| CN114035005A (en) * | 2021-11-18 | 2022-02-11 | 国网重庆市电力公司电力科学研究院 | Gas insulation equipment local overheating decomposition simulation experiment device and use method thereof |
| CN117233545A (en) * | 2023-08-10 | 2023-12-15 | 中国长江电力股份有限公司 | Hydropower station GIL equipment operation condition simulation device and method |
-
2019
- 2019-01-10 CN CN201910023071.6A patent/CN110069804A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112765861A (en) * | 2020-12-30 | 2021-05-07 | 广东电网有限责任公司电力科学研究院 | Method and system for acquiring temperature characteristic curve of overheating defect of high-voltage switch equipment |
| CN112765861B (en) * | 2020-12-30 | 2023-06-20 | 广东电网有限责任公司电力科学研究院 | Temperature characteristic curve acquisition method and system for overheat defect of high-voltage switch equipment |
| CN113237920A (en) * | 2021-05-17 | 2021-08-10 | 西南交通大学 | Method for detecting fault heat source of valve-side sleeve of extra-high voltage converter transformer |
| CN113237920B (en) * | 2021-05-17 | 2022-04-22 | 西南交通大学 | Method for detecting fault heat source of valve-side sleeve of extra-high voltage converter transformer |
| CN114035005A (en) * | 2021-11-18 | 2022-02-11 | 国网重庆市电力公司电力科学研究院 | Gas insulation equipment local overheating decomposition simulation experiment device and use method thereof |
| CN117233545A (en) * | 2023-08-10 | 2023-12-15 | 中国长江电力股份有限公司 | Hydropower station GIL equipment operation condition simulation device and method |
| CN117233545B (en) * | 2023-08-10 | 2024-05-10 | 中国长江电力股份有限公司 | Hydropower station GIL equipment operation condition simulation device and method |
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Application publication date: 20190730 |