CN101435734A - Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas - Google Patents

Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas Download PDF

Info

Publication number
CN101435734A
CN101435734A CNA2008102309832A CN200810230983A CN101435734A CN 101435734 A CN101435734 A CN 101435734A CN A2008102309832 A CNA2008102309832 A CN A2008102309832A CN 200810230983 A CN200810230983 A CN 200810230983A CN 101435734 A CN101435734 A CN 101435734A
Authority
CN
China
Prior art keywords
gas
oil
transformer
insulating oil
tap changer
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
Application number
CNA2008102309832A
Other languages
Chinese (zh)
Inventor
王俊良
曾定文
白慧芳
王振方
段利伟
郑俊阳
杨海峰
牛宇干
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pingdingshan Power Supply Co of State Grid Henan Electric Power Co Ltd
Original Assignee
Pingdingshan Power Supply Co of State Grid Henan Electric Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pingdingshan Power Supply Co of State Grid Henan Electric Power Co Ltd filed Critical Pingdingshan Power Supply Co of State Grid Henan Electric Power Co Ltd
Priority to CNA2008102309832A priority Critical patent/CN101435734A/en
Publication of CN101435734A publication Critical patent/CN101435734A/en
Pending legal-status Critical Current

Links

Abstract

The invention relates to a method for detecting leakage of insulating oil in an on-load tapping switch of a transformer by using SF6 gas, which comprises the following steps: firstly, calculating volume of the SF6 gas in the insulating oil added to the on-load tapping switch; adding the SF6 gas to the insulating oil for the on-load tapping switch according to a calculated value; selecting an oil sample of transformer body oil; and using a gas chromatograph to carry out chromatographic analysis for the selected oil sample of the transformer body oil. If the SF6 gas is detected out, which proves that the on-load tapping switch leaks the insulating oil; and if no SF6 gas is detected out, which proves that the on-load tapping switch does not leak the insulating oil. The method determines the problem of oil leakage of the on-load tapping switch by using an indirect method to avoid occurrence of misjudgment accidents, can judge failure property and approximate position inside equipment to provide reliable scientific basis for maintenance work, reduce unplanned power failure and limited loading time of a transformer, greatly reduce economic expenditure on manpower, physical resources and materials, and reduce labor intensity, insecurity factors and the like.

Description

Utilize SF 6The method of gas detection transformer on-load tap changer insulating oil leakage
Technical field
The present invention relates to a kind of detection method, refer to a kind of SF of utilization especially 6The method of gas detection transformer on-load tap changer insulating oil leakage.
Background technology
The visual plant that transformer is regulated as electric pressure in the electric system, along with development of electric power industry, the above power transformer major part of 35kV has all been installed on-load tap changer, its action accurately rapidly, can reduce with the fluctuation of burning voltage, can force the distribution load electric current, thereby guarantee the power grid security reliability service.
But because some load ratio bridging switch has defective at aspects such as design, technology, material, installation, maintenances, its fault probability is increased, wherein the insulating oil in the shunting switch all has generation to transformer body seepage phenomenon at many power departments, easily cause accident illusions such as transformer internal discharge, brought many troubles for work about electric power person, correct judgement transformer internal operation situation caused have a strong impact on, influenced normal electric power safety production.The method of judging the transformer internal leak at present mainly is to adopt the method for the back manual detection breakthrough that has a power failure, and has not only increased unplanned frequency of power cut, has also increased corresponding maintenance cost.
Summary of the invention
The purpose of this invention is to provide the unplanned frequency of power cut of a kind of minimizing, avoid judging by accident disconnected generation, the differentiating transformer internal fault utilizes SF accurately 6The method of gas detection sub-connecting switch of transformer insulating oil leakage.
For achieving the above object, the technical solution used in the present invention is: a kind of SF that utilizes 6The method of gas detection transformer on-load tap changer insulating oil leakage, step is as follows:
Step 1, according to transformer body oil, on-load tap changer insulating oil weight in the transformer, according to SF 6Add SF in gas stable detection concentration 20 μ L/L and the insulating oil 6The maximum volume number percent of gas is 6%, is calculated as follows respectively to add SF in the on-load tap changer insulating oil 6The minimum volume of gas and maximum volume:
V=(M 1+M 2)÷0.89×20×10 -6
V′=M 2÷0.89×6%
In the formula: minimum volume, the L of unit of adding of V-SF6 gas;
M 1-be transformer body weight of oil, unit K g;
M 2-be transformer loaded switch weight of oil, unit K g;
Maximum volume, the L of unit of adding of V '-SF6 gas;
Step 2, select qualified, new SF for use 6Gas joins in the on-load tap changer insulating oil, and its addition is less than or equal to the maximum adding quantity that calculates in the step 1 greater than the minimum addition of calculating in the step 1;
Step 3,2 add SF set by step 6The transformer operation of gas was got the oil sample of transformer body oil after one month;
Step 4, the transformer body oil oil sample that step 3 is chosen carry out stratographic analysis;
When using gas chromatographic analysis, select the stainless-steel tube of long 2m, internal diameter 3mm for use, inner filling 60~80 purpose GDX~104 carriers are made into into SF 6The gas analysis chromatographic column; Select for use hydrogen to do carrier gas, use gas chromatograph to analyze.
Use liquid-phase chromatographic analysis, directly the sample oil sample is analyzed.
Step 5, judge according to the testing result of step 4:
If detect SF 6Gas illustrates on-load tap changer insulating oil leakage in transformer body oil, simultaneously according to detected SF 6Gas concentration can be judged the speed of seepage;
If do not detect SF 6Gas illustrates that on-load tap changer insulating oil does not leak in the transformer body oil.
The above-mentioned SF that utilizes 6The method of gas detection transformer on-load tap changer insulating oil leakage, the described SF of step 1 6Gas stable detection solubility 20 μ L/L determine as follows:
SF in a, the carrier gas 6Determining of minimum detectable concentration:
Choose the 100mL syringe of 7 smooth, cleanings, good seal, get hydrogen 100mL respectively, use the micro syringe of 10 μ L then, in 7 syringes, add the pure SF of 5 μ L, 4 μ L, 3 μ L, 2.5 μ L, 2 μ L, 1.5 μ L, 1 μ L respectively 6Gas, being mixed with concentration respectively is 50 μ L/L, 40 μ L/L, 30 μ L/L, 25 μ L/L, 20 μ L/L, 15 μ L/L, 10 μ L/L SF 6Sample gas extracts the gas sample of 0.5mL then respectively, and utilizing chromatograph to identify the minimum detection limit is 20 μ L/L.
SF in b, the insulating oil 6Determining of minimum detectable concentration:
Choose the 100mL syringe of 7 smooth, cleanings, good seal, get new insulating oil 100mL respectively, use the micro syringe of 10 μ L then, the concentration that adds 5 μ L, 4 μ L, 3 μ L, 2.5 μ L, 2 μ L, 1.5 μ L, 1 μ L respectively in 7 syringes is 10 6The pure SF of μ L/L 6Gas, being mixed with concentration respectively is 50 μ L/L, 40 μ L/L, 30 μ L/L, 25 μ L/L, 20 μ L/L, 15 μ L/L, 10 μ L/L SF 6Sample solution extracts the oil sample of 0.5mL then respectively, and utilizing chromatograph to identify the minimum detection limit is 20 μ L/L.
Add SF in the described insulating oil 6The maximum volume number percent of gas is 6% to be to determine according to following method: according to " transformer analysis and diagnosis " as can be known, the volume content of gas is about 10% of insulating oil volume in the oil; The volume ratio of gas content of oil of insulating after tested is 4%, determines the SF that adds in on-load tap changer insulating oil 6The volume of gas mostly is 6% most.
The above-mentioned SF that utilizes 6The method of gas detection transformer on-load tap changer insulating oil leakage is characterized in that: the described adding of step 2 SF 6The purity of gas 〉=99.99%.
The invention has the beneficial effects as follows:
Because SF 6Gas has good physicochemical property, not so, strong, the arc extinguishing ability height of not quick-fried, insulating capacity, and stable chemical performance, under red-hot temperature, do not react with other many materials such as oxygen, argon gas, aluminium, its decomposition temperature: 2000 ℃, being 19 times of 105 ℃ of insulating oil decomposition temperatures, is a kind of UHV (ultra-high voltage) insulating medium material of new generation that is better than the sky G﹠O.So SF 6Gas is the optimal gas of differentiating the load ratio bridging switch seepage.
Utilize SF 6The method of gas detection transformer internal leak defines the on-load shunting switch leakage problems, and electrical network economy, safe operation are had far reaching significance, can carry out under situation about not having a power failure, and is time saving and energy saving:
1, avoided the generation of the disconnected accident of erroneous judgement;
2, unplanned power failure of transformer and restriction duration of load application have been reduced;
3, greatly reduce the economy expenditure of human and material resources, material power;
4, labour intensity and unsafe factor etc. have been reduced.
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
Description of drawings
Fig. 1 is a process chart of the present invention
Fig. 2 is SF of the present invention 6Gas standard specimen stratographic analysis spectrogram
Fig. 3 is SF of the present invention 6Sample gas is prepared 20 μ L/L stratographic analysis spectrograms
Fig. 4 is SF of the present invention 6Sample solution is prepared 20 μ L/L stratographic analysis spectrograms
Embodiment
As shown in Figure 1, a kind of SF that utilizes 6The method of gas detection transformer on-load tap changer insulating oil leakage, step is as follows:
Step 1, according to transformer body oil, on-load tap changer insulating oil weight in the transformer, according to SF 6Add SF in gas stable detection concentration 20 μ L/L and the insulating oil 6The maximum volume number percent of gas is 6%, is calculated as follows respectively to add SF in the on-load tap changer insulating oil 6The minimum volume of gas and maximum volume:
V=(M 1+M 2)÷0.89×20×10 -6
V′=M 2÷0.89×6%
In the formula: minimum volume, the L of unit of adding of V-SF6 gas;
M 1-be transformer body weight of oil, unit K g;
M 2-be transformer loaded switch weight of oil, unit K g;
Maximum volume, the L of unit of adding of V '-SF6 gas;
Step 2, select qualified, new SF for use 6Gas joins in the on-load tap changer insulating oil, and its addition is less than or equal to the maximum adding quantity that calculates in the step 1 greater than the minimum addition of calculating in the step 1;
Step 3,2 add SF set by step 6The transformer operation of gas was got the oil sample of transformer body oil after one month;
Step 4, the transformer body oil oil sample that step 3 is chosen carry out stratographic analysis;
When using gas chromatographic analysis, select the stainless-steel tube of long 2m, internal diameter 3mm for use, inner filling 60~80 purpose GDX~104 carriers are made into into SF 6The gas analysis chromatographic column; Select for use hydrogen to do carrier gas, use gas chromatograph to analyze.
Use liquid-phase chromatographic analysis, directly the sample oil sample is analyzed.
Step 5, judge according to the testing result of step 5:
If detect SF 6Gas illustrates on-load tap changer insulating oil leakage in transformer body oil, simultaneously according to detected SF 6Gas concentration can be judged the speed of seepage;
If do not detect SF 6Gas illustrates that on-load tap changer insulating oil does not leak in the transformer body oil.
The described SF of step 1 6Gas stable detection solubility 20 μ L/L determine as follows:
SF in a, the carrier gas 6Determining of minimum detectable concentration:
Choose the 100mL syringe of 7 smooth, cleanings, good seal, get hydrogen 100mL respectively, use the micro syringe of 10 μ L then, in 7 syringes, add the pure SF of 5 μ L, 4 μ L, 3 μ L, 2.5 μ L, 2 μ L, 1.5 μ L, 1 μ L respectively 6Gas, being mixed with concentration respectively is 50 μ L/L, 40 μ L/L, 30 μ L/L, 25 μ L/L, 20 μ L/L, 15 μ L/L, 10 μ L/L SF 6Sample gas; Extract the gas sample of 0.5mL then respectively, utilizing chromatograph to identify the minimum detection limit is 20 μ L/L.
SF in b, the insulating oil 6Determining of minimum detectable concentration:
Choose the 100mL syringe of 7 smooth, cleanings, good seal, get new insulating oil 100mL respectively, use the micro syringe of 10 μ L then, the concentration that adds 5 μ L, 4 μ L, 3 μ L, 2.5 μ L, 2 μ L, 1.5 μ L, 1 μ L respectively in 7 syringes is 10 6The pure SF of μ L/L 6Gas, being mixed with concentration respectively is 50 μ L/L, 40 μ L/L, 30 μ L/L, 25 μ L/L, 20 μ L/L, 15 μ L/L, 10 μ L/L SF 6Sample solution; Extract the oil sample of 0.5mL then respectively, utilizing chromatograph to identify the minimum detection limit is 20 μ L/L.
Add SF in the described insulating oil 6The maximum volume number percent of gas is 6% to be to determine according to following method: according to " transformer analysis and diagnosis " as can be known, the volume content of gas is about 10% of insulating oil volume in the oil; The volume ratio of gas content of oil of insulating after tested is 4%, determines the SF that adds in on-load tap changer insulating oil 6The volume of gas mostly is 6% most.
The described adding of step 2 SF 6The purity of gas 〉=99.99%.
Determine to add in the transformer insulation oil SF 6Gas is to realize prerequisite of the present invention to the influence of oil and the amount of adding, for implementing the present invention, at first determines SF in the insulating oil 6Gas partition coefficient, gas chromatograph are to SF 6The minimum detection limit of gas sample is identified to add SF simultaneously 6Gas is to the oil of insulating oil.
At first as follows to SF in the insulating oil 6The partition factor of gas is measured:
1, gets new insulating oil 500mL as blank oil.
2, draw blank oily 20mL, the SF of the 20mL that reinjects with the 100mL syringe 6Gas is placed in constant temperature and is in 50 ℃ the shaker, after the vibration balance, takes out whole balanced gas, and analyzes SF 6Gas concentration sees table one for details.
3, after first time balance, inject the 20mL pure hydrogen in the syringe oil sample and do carrier gas, be placed in constant temperature and be in 50 ℃ the shaker and carry out vibration second time, after the balance of vibrating, take out whole balanced gas, and read gas volume accurately, analyze SF then 6Gas concentration sees Table one mutually.
4, measure formula according to gas partition coefficient in the insulating oil in the GB/T 17623-1998 gas Chromatographic Determination method and calculate SF 6Gas is partition factor in insulating oil, sees table one for details.
SF in table one insulating oil 6The mensuration table of gas partition coefficient
According to different SF 6Gas concentration is measured gas chromatograph to SF 6The minimum detection limit of gas sample:
According to law:
(1) equivalent theorem: M 1V 1=M 2V 2
(2), gas molecule diffusion theory: as can be known by molecular motion of material, because the molecule of the object that is in contact with one another is irregularly to move, so these molecules will be crossed the contact of object naturally and infiltrate each other, spontaneously mix up mutually, form diffusion phenomena.
(3) distribution law: when solute is dissolved in two kinds of immiscible or mixing materials of mixing hardly simultaneously respectively, its concentration ratio in the solvent of two kinds of liquid has a definite value or approaches a definite value, this definite value approximates the ratio of solute solubleness in two kinds of liquid fluxs, wherein said proportionate relationship is called partition factor.
With reference to Fig. 2
Determine the SF of purity 〉=99.99% with SP-3430 type gas chromatograph 6The appearance time of gas, go out peak area and concentration.
With reference to Fig. 3, table two
SF to variable concentrations 6The gas sample carries out stratographic analysis:
Choose the 100mL syringe of 7 smooth, cleanings, good seal, get hydrogen 100mL respectively, use the micro syringe of 10 μ L then, in 7 syringes, add the pure SF of 5 μ L, 4 μ L, 3 μ L, 2.5 μ L, 2 μ L, 1.5 μ L, 1 μ L respectively 6Gas, being mixed with concentration respectively is 50 μ L/L, 40 μ L/L, 30 μ L/L, 25 μ L/L, 20 μ L/L, 15 μ L/L, 10 μ L/L SF 6Sample gas.Extract respectively then in the gas sample injecting chromatograph of 0.5mL, identifying the minimum detection limit is 20 μ L/L.
The SF6 gas sample stratographic analysis of table two variable concentrations is table as a result
By table two and Fig. 3 as can be seen:
1, SF 6The data deviation that gas sample concentration and chromatograph test out is bigger.According to the gas molecule diffusion theory as can be known, the object molecule that is in contact with one another can infiltrate each other, spontaneously mix up mutually, but because SF 6Molecular weight gas is big, easily sinks, and works as SF 6When gas and diluents mix up mutually, the skewness phenomenon will occur, and cause the test figure deviation.
2, the minimum detection limiting concentration of SF6 gas sample should be 20 μ L/L.
With reference to Fig. 4, table three
SF to different volumes concentration 6The insulating oil sample solution carries out stratographic analysis:
Choose the 100mL syringe of 7 smooth, cleanings, good seal, get new insulating oil 100mL respectively, use the micro syringe of 10 μ L then, in 7 syringes, add the pure SF of 5 μ L, 4 μ L, 3 μ L, 2.5 μ L, 2 μ L, 1.5 μ L, 1 μ L respectively 6(concentration is 10 to gas 6μ L/L), being mixed with concentration respectively is 50 μ L/L, 40 μ L/L, 30 μ L/L, 25 μ L/L, 20 μ L/L, 15 μ L/L, 10 μ L/L SF 6Sample solution.Extract respectively then in the oil sample injecting chromatograph of 0.5mL, identifying the minimum detection limit is 20 μ L/L.
The SF of table three different volumes concentration 6The insulating oil sample solution carries out the stratographic analysis result
By table three and Fig. 4 as can be seen:
1, SF 6Sample solution concentration and chromatograph are analyzed data error and are met the guide rule regulation, and this illustrates SF 6Gas is in solvable and the insulating oil.
2, as shown in Table 3: SF 6The minimum detection limit of gas sample should be 20 μ L/L.
According to the test result of above gas sample and oil sample, can determine that gas chromatograph is to SF 6The minimum detection limiting concentration of gas sample is about 20 μ L/L.
The SF of variable concentrations 6The oily situation of oil sample sees Table four:
Table four: the oily situation of the SF6 oil sample of variable concentrations
By the oily test figure of table four as can be known: the SF that in oil, mixs up variable concentrations 6During gas, its SF 6Oil sample meets the requirement of insulating oil GB.
Embodiment 1
With 50 tons of transformer body oil, shunting switch insulating oil is example for 500 kilograms:
Step 1, determine the SF that in load ratio bridging switch, adds 6Gas flow:
According to SF 6Add SF in gas stable detection solubility 20 μ L/L and the insulating oil 6The maximum volume number percent of gas is 6%, is calculated as follows SF in the on-load tap changer insulating oil respectively 6The minimum volume of gas and maximum volume:
V=(M 1+M 2)÷0.89×20×10 -6
=(50000+500)÷0.89×20×10 -6=1.1(L)
V′=M 2÷0.89×6%=500÷0.89×6%=33.7(L)
In the formula: minimum volume, the L of unit of adding of V-SF6 gas;
M 1-be transformer body weight of oil, unit K g;
M 2-be transformer loaded switch weight of oil, unit K g;
Maximum volume, the L of unit of adding of V '-SF6 gas;
Owing to add the SF of minimum volume in the on-load tap changer insulating oil 6During gas, the insulating oil in the load ratio bridging switch all leaks in the transformer body oil, SF in the transformer body oil 6The volumetric concentration of gas is 20 μ L/L, but this in practice situation is impossible, therefore, in real work, adds SF 6To be far longer than the minimum volume amount during gas, general near or equal the maximum volume amount.
Add 33.7L SF in the 500kg loaded tap switch oil 6During gas, its concentration is: 60000 μ L/L.
Step 2, to select qualified purity for use be 99.99% new SF 6Gas adds 33.7L in on-load tap changer insulating oil;
Step 3,2 add SF set by step 6The transformer operation of gas was got the oil sample of transformer body oil after one month; And according to one month serial sampling interval time 3 times;
Determine that how many times are leakage be, chromatograph just has response: promptly: the transformer of 50 tons of transformer body oil, and needing how many mL content of seepage is the shunting switch oil of 60000 μ L/LSF6, chromatograph just has response:
According to equivalent law M 1V 1=M 2V 2Can calculate minimum leakage V 1:
60000×V1=20×50000÷0.89
Minimum leakage V 1=18.7L
So when load ratio bridging switch oil seepage amount was 18.7 liters, chromatograph just had response, that is to say in 18.7 liters of transformers that are dissolved in 50 tons of oil the SF of 50 tons of oil 6Content is 20 μ L/L, sampling this moment, and chromatograph can detect SF 6Content determines that shunting switch has breakthrough.
Step 4, select the stainless-steel tube of long 2m, internal diameter 3mm for use, inner filling 60~80 purpose GDX~104 carriers are made into into SF 6The gas analysis chromatographic column; Select for use hydrogen to do carrier gas, use gas chromatograph, the transformer body oil oil sample that step 3 is chosen carries out gas chromatographic analysis;
Earlier chromatograph is demarcated, to the oil sample degassing of vibrating, after the vibration balance, taken out whole balanced gas, and read gas volume accurately again, get 0.5mL gas sample injecting chromatograph then,, differentiate SF by thermal conductance assessor at last through chromatographic column 6Whether gas exists, and calculates SF accurately 6Content.
Serial sampling 3 times, analysis result is: 0 μ L, 0 μ L, 15 μ L;
Step 5, judge according to the testing result of step 4:
The result of the testing result of step 4 shows: all do not detect SF preceding twice 6Gas illustrates that on-load tap changer insulating oil does not have or SF is seldom arranged 6Gas permeation detects SF the 3rd time in transformer body oil 6Gas illustrates on-load tap changer insulating oil leakage in transformer body oil, in case detect SF from transformer body oil 6Gas just needs to shorten the sample interval, and one month the time interval changes 10 days into takes a sample once or took a sample once in 1 day, analyzes the speed of determining seepage.
Embodiment 2
Select 110kV to build transformer station, the transformer model is: SFZLB-31500/110, appearance is numbered: 818L06-1.This transformer put into operation from 8 or three years, found that at run duration the heavy 400kg of the oil of load ratio bridging switch suspects that the loaded tap switch oil chamber is toward the body seepage;
Step 1: determine SF 6The addition of gas:
The volume of load ratio bridging switch: 400 * 0.89=449L
The addition of SF6 gas: 449 * 6%=27L
Step 2: the SF that in loaded tap switch oil, injects 27L 6Gas:
Selecting purity is 99.99% SF 6Gas and minute adjustment valve connect with stainless-steel tube, an edge joint SF 6The reduction valve delivery outlet, Yi Bian link to each other with the gas relay deflating valve of load ratio bridging switch.Regulate accurate needle-valve, make SF 6Gas flow rate is controlled at 125ml/min, is convenient to SF 6Gas slowly is dissolved in the oil uniformly.Continuous charge 4 hours reaches SF 6The quantitative really 27L of gas.
Step 3: gather oil sample, prepare SF 6Gas permeation is analyzed, and injects SF 6Gas begins sampling after one day, according to one day time interval serial sampling 10 times;
Step 4: make SF 6The gas analysis chromatographic column; The transformer body oil sample that step 3 was gathered in continuous 10 days carries out gas chromatographic analysis, and concrete analysis the results are shown in following table:
Date of test 2008. 03.04—10 2008. 03.11 2008. 03.12 2008. 03.13
SF6 gas content μ L/L 0 Trace Trace 13.6
Step 5: by the analysis result of step 4 as can be known, the on-load tap changer insulating oil of transformer is seepage in transformer body oil.
The present invention utilizes round-about way to define the on-load shunting switch leakage problems, and electrical network economy, safe operation are had far reaching significance: avoided the generation of erroneous judgement accident; Can be according to test data, judgment device internal fault character and Position Approximate are for service work provides reliable scientific basis; Unplanned power failure of transformer and restriction duration of load application have been reduced; Greatly reduce the economy expenditure of human and material resources, material power; Labour intensity and unsafe factor etc. have been reduced.
Along with improving constantly of gas chromatographic analysis precision, utilize SF 6The minimum detectable concentration of the method for gas detection transformer on-load tap changer insulating oil leakage will be reduced gradually by 20 μ L/L, and so, the mensuration of the minimum leakage of on-load tap changer insulating oil will reduce.Even if a small amount of seepage is arranged also can be measured.More help of the present invention applying.

Claims (3)

1, a kind of SF that utilizes 6The method of gas detection transformer on-load tap changer insulating oil leakage is characterized in that: step is as follows:
Step 1, according to transformer body oil, on-load tap changer insulating oil weight in the transformer, according to SF 6Add SF in gas stable detection concentration 20 μ L/L and the insulating oil 6The maximum volume number percent of gas is 6%, is calculated as follows respectively to add SF in the on-load tap changer insulating oil 6The minimum volume of gas and maximum volume:
V=(M 1+M 2)÷0.89×20×10 -6
V′=M 2÷0.89×6%
In the formula: minimum volume, the L of unit of adding of V-SF6 gas;
M 1-be transformer body weight of oil, unit K g;
M 2-be transformer loaded switch weight of oil, unit K g;
Maximum volume, the L of unit of adding of V '-SF6 gas;
Step 2, select qualified, new SF for use 6Gas joins in the on-load tap changer insulating oil, and its addition is less than or equal to the maximum adding quantity that calculates in the step 1 greater than the minimum addition of calculating in the step 1;
Step 3,2 add SF set by step 6The transformer operation of gas was got the oil sample of transformer body oil after one month according to certain time interval;
Step 4, the transformer body oil oil sample that step 3 is chosen carry out stratographic analysis;
Step 5, judge according to the testing result of step 5:
If detect SF 6Gas illustrates on-load tap changer insulating oil leakage in transformer body oil, simultaneously according to detected SF 6Gas concentration can be judged the speed of seepage;
If do not detect SF 6Gas illustrates that on-load tap changer insulating oil does not leak in the transformer body oil.
2, according to the described SF that utilizes of claim 1 6The method of gas detection transformer on-load tap changer insulating oil leakage is characterized in that: the described SF of step 1 6Gas stable detection solubility 20 μ L/L determine as follows:
SF in a, the carrier gas 6Determining of minimum detectable concentration:
Choose the 100mL syringe of 7 smooth, cleanings, good seal, get hydrogen 100mL respectively, use the micro syringe of 10 μ L then, in 7 syringes, add the pure SF of 5 μ L, 4 μ L, 3 μ L, 2.5 μ L, 2 μ L, 1.5 μ L, 1 μ L respectively 6Gas, being mixed with concentration respectively is 50 μ L/L, 40 μ L/L, 30 μ L/L, 25 μ L/L, 20 μ L/L, 15 μ L/L, 10 μ L/L SF 6Sample gas extracts the gas sample of 0.5mL then respectively, and utilizing chromatograph to identify the minimum detection limit is 20 μ L/L;
SF in b, the insulating oil 6Determining of minimum detectable concentration:
Choose the 100mL syringe of 7 smooth, cleanings, good seal, get new insulating oil 100mL respectively, use the micro syringe of 10 μ L then, the concentration that adds 5 μ L, 4 μ L, 3 μ L, 2.5 μ L, 2 μ L, 1.5 μ L, 1 μ L respectively in 7 syringes is 10 6The pure SF of μ L/L 6Gas, being mixed with concentration respectively is 50 μ L/L, 40 μ L/L, 30 μ L/L, 25 μ L/L, 20 μ L/L, 15 μ L/L, 10 μ L/L SF 6Sample solution extracts the oil sample of 0.5mL then respectively, and utilizing chromatograph to identify the minimum detection limit is 20 μ L/L;
Add SF in the described insulating oil 6The maximum volume number percent of gas is 6% to be to determine according to following method: according to " transformer analysis and diagnosis " as can be known, the volume content of gas is about 10% of insulating oil volume in the oil; The volume ratio of gas content of oil of insulating after tested is 4%, determines the SF that adds in on-load tap changer insulating oil 6The volume of gas mostly is 6% most.
3, according to the described SF that utilizes of claim 1 6The method of gas detection transformer on-load tap changer insulating oil leakage is characterized in that: the described adding of step 2 SF 6The purity of gas 〉=99.99%.
CNA2008102309832A 2008-11-11 2008-11-11 Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas Pending CN101435734A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2008102309832A CN101435734A (en) 2008-11-11 2008-11-11 Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2008102309832A CN101435734A (en) 2008-11-11 2008-11-11 Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas

Publications (1)

Publication Number Publication Date
CN101435734A true CN101435734A (en) 2009-05-20

Family

ID=40710289

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2008102309832A Pending CN101435734A (en) 2008-11-11 2008-11-11 Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas

Country Status (1)

Country Link
CN (1) CN101435734A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101799458A (en) * 2010-03-25 2010-08-11 广东电网公司电力科学研究院 Method for analyzing decomposition products of SF6 in electrical device
CN103398830A (en) * 2013-08-12 2013-11-20 贵州长征电力设备有限公司 Oil chamber sealing leak detection device and method of on-load tap-changer
CN107314860A (en) * 2016-04-27 2017-11-03 上海金艺检测技术有限公司 The chromatogram diagnostic method of oil-filled transformer loaded switch seepage
CN110887617A (en) * 2019-11-30 2020-03-17 国网辽宁省电力有限公司锦州供电公司 Method for quantitatively judging leakage oil of on-load tap-changer by additive detection method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101799458A (en) * 2010-03-25 2010-08-11 广东电网公司电力科学研究院 Method for analyzing decomposition products of SF6 in electrical device
CN101799458B (en) * 2010-03-25 2013-06-19 广东电网公司电力科学研究院 Method for analyzing decomposition products of SF6 in electrical device
CN103398830A (en) * 2013-08-12 2013-11-20 贵州长征电力设备有限公司 Oil chamber sealing leak detection device and method of on-load tap-changer
CN103398830B (en) * 2013-08-12 2016-01-20 贵州长征电气有限公司 A kind of grease chamber's sealing leak hunting method of load ratio bridging switch
CN107314860A (en) * 2016-04-27 2017-11-03 上海金艺检测技术有限公司 The chromatogram diagnostic method of oil-filled transformer loaded switch seepage
CN110887617A (en) * 2019-11-30 2020-03-17 国网辽宁省电力有限公司锦州供电公司 Method for quantitatively judging leakage oil of on-load tap-changer by additive detection method
CN110887617B (en) * 2019-11-30 2021-08-06 国网辽宁省电力有限公司锦州供电公司 Method for quantitatively judging leakage oil of on-load tap-changer by additive detection method

Similar Documents

Publication Publication Date Title
CN104076102B (en) Mobile insulation dissolved gas analysis instrument and detection method thereof
CN101435734A (en) Method for detecting transformer on-load tap changer insulating oil leakage by SF6 gas
CN102353750B (en) Crude oil low-temperature oxidation experimental device for light oil reservoir air-injection oil extraction
CN106370746A (en) Gas-dissolved-in-vegetable-insulating-oil analyzer with oil-gas separation function and detecting method
CN103424486A (en) System and method for detecting performance of transformer oil chromatography online monitoring device
CN102914456A (en) Oil gas concentration sampling detection device, use method and application thereof
CN103149345A (en) Detecting method and detecting device for intelligent dissolved gas-in-oil component
CN107102085A (en) The sample-pretreating method of methanol content measuring in a kind of insulating oil
CN101762655A (en) Method for detecting internal fault of SF6 electrical equipment by using gas chromatograph
CN110231550A (en) The experimental simulation device and method of gas insulated electric apparatus Arcing fault
CN103472177B (en) A kind of gas phase chromatographic device fluoridizing sulfonyl for detecting sulfur hexafluoride decomposition product
CN105223295A (en) Regenerable sorbent suction/desorption performance detection method
CN102967671A (en) Device and method for detecting sulfur hexafluoride gas in oil immersed transformer
CN206032280U (en) Outer floating top storage tank's initiative safety protection and vapor recovery system device
CN106872613B (en) Transformer standard oil sample preparation device and operation method thereof
CN106093228A (en) A kind of transformer station on-line chromatograph monitor device does not shut down method of calibration
CN104634898B (en) Test method and the device of transformer oil aerogenesis trend is evaluated under electric heating mixing field
CN105158164A (en) Method for detecting oil-gas concentration of oil tank with passive laser
CN104655570A (en) Method for achieving passive laser detection on oil-gas mixed gases under various conditions
CN105136917A (en) Qualitative and quantitative analytic method of multiple sulfides in transformer oil
CN210071754U (en) Detection C4F7N and CO2Device for mixing decomposition products of gas
CN104614594A (en) Device and method for detecting compatibility and gas generation features of solid material and liquid material
CN203465246U (en) System for detecting performance of transformer oil chromatograph on-line monitoring device
CN106370764A (en) Refilling type sulfur hexafluoride decomposition product chromatography online detector
CN205404503U (en) Simulation system for chromatographic on -line detection of transformer oil gas

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
WD01 Invention patent application deemed withdrawn after publication

Open date: 20090520

C02 Deemed withdrawal of patent application after publication (patent law 2001)