A kind of Forecasting Methodology of the electric force compounded grease aging of current conversion station electrical contact junction
A kind of Forecasting Methodology of the electric force compounded grease aging of current conversion station electrical contact junction
 CN 107,290,268 A
 Filed: 04/11/2016
 Published: 10/24/2017
 Est. Priority Date: 04/11/2016
 Status: Active Application
First Claim
1. a kind of Forecasting Methodology of the electric force compounded grease aging of current conversion station electrical contact junction, it is characterised in that methods described bagInclude following steps：
 Step 1. sets up electric force compounded grease aging and accelerates forecast model；
Step 2. carries out the combined factor prediction experiment of electric force compounded grease aging；
Step 3. carries out multivariate linear equation according to result of the test to the electric force compounded grease aging acceleration model, obtains describedCurrent conversion station makes electrical contact with predicting the outcome for the electric force compounded grease aging of junction.
Chinese PRB Reexamination
Abstract
The present invention provides a kind of Forecasting Methodology of the electric force compounded grease aging of current conversion station electrical contact junction, and forecast model is accelerated by setting up electric force compounded grease aging；Carry out the combined factor prediction experiment of electric force compounded grease aging；According to result of the test, multivariate linear equation is carried out to electric force compounded grease aging acceleration model, the electric force compounded grease aging for obtaining current conversion station electrical contact junction predicts the outcome.Method proposed by the present invention considers three factors of thermoelectricity salt fog, more it is combined the actual environment condition that the change of current is just stood, so as to which the aging lifespan under the conditions of predicting electric force compounded grease in current conversion station thermoelectricity salt fog is laid a good foundation, it ensure that and change the electric force compounded grease that current conversion station makes electrical contact with junction aging in time, to avoid occurring accident because temperature rise is too high herein.

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Current Assignee

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10 Claims

1. a kind of Forecasting Methodology of the electric force compounded grease aging of current conversion station electrical contact junction, it is characterised in that methods described bagInclude following steps：

Step 1. sets up electric force compounded grease aging and accelerates forecast model； Step 2. carries out the combined factor prediction experiment of electric force compounded grease aging； Step 3. carries out multivariate linear equation according to result of the test to the electric force compounded grease aging acceleration model, obtains describedCurrent conversion station makes electrical contact with predicting the outcome for the electric force compounded grease aging of junction.


2. the method as described in claim 1, it is characterised in that the step 1 includes：

11. determine the change of current website junction electric force compounded grease aging factor and the electric force compounded grease aging factor itBetween relation； 12. is according to relation between the electric force compounded grease aging factor, and the aging for setting up the electric load accelerates prediction mouldType.


3. method as claimed in claim 2, it is characterised in that the step 11 includes：

Determine that the electric force compounded grease aging factor includes the heat ageing factor, the voltage ageing factor and salt fog aging factor； And relation is as follows between determining the electric force compounded grease aging factor： <
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is Weibull distribution characteristics life；
A is the heat ageing factor；
B is the voltage ageing factor；
C be salt fog aging becauseSon；
T is absolute temperature；
K is salt air corrosion coefficient；
A1, a2 are heat ageing factor a parameter value；
B1, b2 be voltage ageing becauseSub b parameter value；
C1, c2 are salt fog aging factor c parameter value；
The electric current that I is led to by experiment；
R is combined to be not coated with electric powerResistance value at the electrical connection of fat；
α
is the change value for applying resistance value at the electrical connection after electric force compounded grease.


4. method as claimed in claim 3, it is characterised in that the step 12 includes：

The test voltage U is made to be： U=I (1+ α
) R (2)Then have： Ln η
=(a_{1}+a_{2}U)+(b_{1}+b_{2}U)/T+(c_{1}+c_{2}U)/K (3)And then obtain the aging acceleration forecast model of the electric load under thermoelectricitysalt fog coupling： <
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B is the voltage ageing factor coefficient of model；
C is the salt fog aging of modelFactor coefficient；
A1 and A2 is A constant parameter；
B1 and B2 is B constant parameter；
C1 and C2 is C constant parameter.


5. method as claimed in claim 4, it is characterised in that the step 2 includes：

21. is by the ln η
in formula (3) as dependent variable, it is determined that the independent variable parameter in formula (3), including：
U、
T、
K、
U/TAnd U/K；22. determines the measuring apparatus of the independent variable parameter； Wherein, independent variable parameter T measuring apparatus be exchange 4000A and direct current 6000A strong current generator, outer temperature measurer,Hinder contact type temperature sensor and high sensitivity resistance meter；
Independent variable parameter K measuring apparatus is saltmist corrosion tester；Independent variable parameter U, U/T and U/K are tried to achieve according to T and K； 23. connects the pilot system of the combined factor prediction experiment of electric force compounded grease aging according to the measuring apparatus； 24. carries out the combined factor prediction experiment of electric force compounded grease aging with the pilot system, obtains result of the test, describedResult of the test includes each independent variable the parameter T and K measured value.


6. method as claimed in claim 5, it is characterised in that the step 23 includes：

A. the electrical contact connection test specimen for scribbling electric force compounded grease is placed in the salt air corrosion experimental box of closing, the salt fog is rottenCorrosion test case is furnished with salt fog generator； B. the strong current generator and Synthesis Data Collection System Based are arranged on outside the salt air corrosion experimental box, and by instituteThe two ends and the strong current generator for stating electrical connection test specimen connect, and form loop； C. the measuring point of the electrical connection test specimen is connected with being arranged in the Synthesis Data Collection System Based, to monitor the measuring pointTemperature, the measuring point is provided with contact type temperature sensor； D., exterior measuring temperature instrument and high sensitivity resistance meter are set outside the salt air corrosion experimental box.


7. method as claimed in claim 6, it is characterised in that the step 24 includes：

E. the salt fog generator is opened, and is detected by the Synthesis Data Collection System Based in the salt air corrosion experimental boxConcentration of saline fog COEFFICIENT K； F, the unlatching strong current generator, and the electrical connection test specimen is tested in regulation by the Synthesis Data Collection System BasedHigh current effect under, the temperature of the measuring point and the contact resistance of electric force compounded grease； G. the electric current of connection is increased so that electric force compounded grease aging accelerates, while Synthesis Data Collection System Based monitoring temperature T； H. when flex point occurs in the temperature risingtime change in data collecting system, i.e., when temperature rise accelerates change, experiment, record are stoppedMeasuring point temperature T, the resistance value R of electric force compounded grease, test current I and salt spray test COEFFICIENT K.


8. method as claimed in claim 7, it is characterised in that the step 3 includes：

31. tries to achieve the value of all independent variable parameters according to result of the test； 32. carries out multivariate linear equation to the electric force compounded grease aging acceleration model, obtained according to the independent variable parameterThe current conversion station makes electrical contact with predicting the outcome for the electric force compounded grease aging of junction.


9. method as claimed in claim 8, it is characterised in that the step 31 includes：
Bring temperature T, the resistance value R of electric force compounded grease, electric current I and the salt spray test COEFFICIENT K in the result of the test into formula(2) U, U/T and U/K parameter value, are obtained.

10. method as claimed in claim 9, it is characterised in that the step 32 includes：

I. line translation is entered to formula (3), obtained： Ln η
=a_{1}+a_{2}U+b_{1}/T+c_{1}/K+b_{2}U/T+c_{2}U/K+ε
(5)In formula (5), ε
is residual error；J. all independent variable parameters are brought into formula (5) and returned with the multiple linear of MATLAB programming realization model parametersReturn estimation, obtain a_{1}、
a_{2}、
b_{1}、
b_{2}、
c_{1 and}c_{2}Parameter value, and then draw the specific table of electric force compounded grease accelerated ageing forecast modelUp to formula.

Specification(s)