CN103293417B - The detection method of transformer degree of aging - Google Patents

Abstract

The detection method that the invention discloses a kind of transformer degree of aging, the method comprises the steps: 1) be V to volume_oil-sampleTransformer insulation oil oil sample vacuumize, the mist that makes to be dissolved in insulating oil separates with oily, after separating, the cumulative volume of mist place air chamber is V_gas; 2) from isolated mist, extract the sample gas of certain volume; 3) gas mixing in described sample gas is separated, isolate H₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Gas; 4) measure respectively H by gas sensor₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The concentration C of gas_gas-i-detect; 5), according to formula<maths num="0001"></maths>Calculate the concentration C of gas component i in tested oil sample_i-in-oil, wherein, η is stripping factor; Step 5), according to the concentration C of gas component i_i-in-oil, according to known method analysis with judge transformer degree of aging and fault type.

Description

The detection method of transformer degree of aging

Technical field

The present invention relates to a kind of detection method of transformer degree of aging, especially utilize and be dissolved inGas content in transformer insulation oil judges the method for transformer degree of aging.

Background technology

Component and the content of analyzing oil dissolved gas are to monitor oil-filled electric equipment safe operationOne of effective measures, utilize gc analysis oil dissolved gas to monitor oil-filled electricEquipment safety operation has had the use experience of more than 40 year in China. According to " GB/7252-2001Gases Dissolved in Transformer Oil is analyzed and is judged directive/guide " regulation, this measuring method need throughCross sampling, from oil, deviate from dissolved gas, gas sampling, gas separate, gas detects, knowSeven links such as calculation peak, peak, quantitative calculating, each link very important person, for participating in, easily causes mistakePoor, bring very big impact to test repeatability and accuracy.

The release of Dissolved Gases in Transformer Oil on-line monitoring method is several years only, from electric power areSystem operation department feedback obtains message, several thousand Gases Dissolved in Transformer Oils installing at homeThe ruuning situation of on-Line Monitor Device is also pessimistic, and problem is mainly that measure error is bigger than normal.

Summary of the invention

For problems of the prior art, the detection method of transformer degree of aging of the present inventionCarrying out a large amount of actual measurements, accumulating on a large amount of operating experience bases, working outA whole set of separates link from Oil-gas Separation link, mist quantitative sample injection link, mistCalculate the comprehensive study analyses such as link with tested gasometry, obtained a kind of based on chromatographic techniqueThe online of operating transformer insulating oil dissolved gas quantitatively detected and calculated, and then draw transformationThe method of device degree of aging.

To achieve these goals, the detection method of transformer degree of aging of the present invention, the methodComprise the steps:

Step 1) is V to volume_oil-sampleTransformer insulation oil oil sample vacuumize, makeThe mist being dissolved in insulating oil separates with oily, and after separating, mist place air chamber is totalVolume is V_gas；

Step 2), from isolated mist, extract the sample gas of certain volume;

Step 3), separates the gas mixing in described sample gas, isolates H₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Gas;

Step 4), measures respectively H by gas sensor₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The concentration C of gas_gas-i-detect；

Step 5), according to formula

$C_{i-\mathrm{in}-\mathrm{oil}}=\frac{C_{\mathrm{gas}-i-\det \mathrm{ect}}*V_{\mathrm{gas}}}{(1-\mathrm{\&eta;})*V_{\mathrm{oil}-\mathrm{sample}}}$

Calculate the concentration C of gas component i in tested oil sample_i-in-oil, wherein, η is degassed systemNumber;

Step 5), according to the concentration C of gas component i_i-in-oil, according to known method analysis andJudge transformer degree of aging and fault type.

Further, described in described step 4), gas sensor is measured H as follows₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The concentration C of gas_gas-i-detect：

1. step, is used the H of several variable concentrations₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Calibrating gas carries out C to gas sensor_i-xConcentration calibration, wherein, i is gas component, xBe in x kind concentration;

2. step, demarcates the H of rear variable concentrations₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Gas pairThe peak height of answering is H_i-x；

3. step, carries out Mathematical Fitting to the gas of each component respectively with Lagrangian method:C_gas-i-detect=f（H_i), and calculate the concentration value C of gas i_gas-i-detect；

Wherein, i is gas component, and x is x kind concentration.

Further, to described C_i-xWith described H_i-xSet up respectively ID table, every group of standard divided gasBody be divided into 10 grades by concentration, in described ID table, be arranged in order from low to high.

Detailed description of the invention

Below the specific embodiment of the present invention is elaborated.

Insulating oil dissolved gas of the present invention detects metering method online, and the method comprises the steps:

Step 1) is V to volume_oil-sampleTransformer insulation oil oil sample vacuumize, makeThe mist being dissolved in insulating oil separates with oily, and after separating, mist place air chamber is totalVolume is V_gas。

Step 2), from isolated mist, extract the sample gas of certain volume.

Step 3), separates the gas mixing in described sample gas, isolates H₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Gas.

Step 4), measures respectively H by gas sensor₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The concentration C of gas_gas-i-detect, concrete detecting step is: the H that 1. uses 10 kinds of variable concentrations₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Calibrating gas carries out C to gas sensor_i-xConcentration calibration,Set up concentration ID table from low to high, in table 1; 2. the H of variable concentrations after demarcating₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The peak height that gas is corresponding is H_i-x, set up H_i-xID table, seeTable 2, wherein, i is gas component, x is in x kind concentration; 3. use Lagrangian methodRespectively the gas of each component is carried out to Mathematical Fitting: C_gas-i-detect=f（H_i), and calculateDraw the concentration value C of gas i_gas-i-detect。

Step 5), according to formula

$C_{i-\mathrm{in}-\mathrm{oil}}=\frac{C_{\mathrm{gas}-i-\det \mathrm{ect}}*V_{\mathrm{gas}}}{(1-\mathrm{\&eta;})*V_{\mathrm{oil}-\mathrm{sample}}}$

Calculate the concentration C of gas component i in tested oil sample_i-in-oil, wherein, η is degassed systemNumber.

Step 5), according to the concentration C of gas component i_i-in-oil, according to State Grid's standardThe event of the proposition in GBT7252-2001 " Gases Dissolved in Transformer Oil analysis and judge directive/guide "Barrier type judgement method, analyzes and judges transformer degree of aging and fault type.

The corresponding concentration of table 1 gas with various component (unit: ppm)

Gas	H2	CO	CH4	C2H4	C2H6	C2H2
							1	2.07	4.78	0.5	0.5	0.51	0.51
2	8.28	19.10	2.00	2.00	2.02	20.2
							3	18.97	40.65	6.97	5.48	4.98	5.13
4	59.28	127.03	21.78	17.13	15.58	16.03
							5	128.03	274.37	47.03	36.99	33.64	34.61
6	237.10	508.10	87.10	68.50	62.30	64.10
							7	809.37	1502.24	289.70	229.11	208.83	256.36
8	1380.69	2562.64	494.19	390.83	356.24	437.32
							9	2332.89	4329.98	835.01	660.37	601.92	738.92
10	3856.41	7157.73	1380.32	1091.64	995.64	1221.48

The corresponding peak height of table 2 variable concentrations gas component (unit: uv)

Embodiment 1

The transformer insulation oil oil sample that step 1) is 45ml to volume vacuumizes, and makes moltenThe mist of solution in insulating oil separates with oily, and after separating, mist place air chamber is overallAmass as 18.47ml.

Step 2), from isolated mist, extract the sample gas of certain volume.

Step 3), separates the gas mixing in described sample gas, isolates H₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Gas.

Step 4), measures respectively H by gas sensor₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The concentration C of gas_gas-i-detectConcrete detecting step is: the H that 1. uses 10 kinds of variable concentrations₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Calibrating gas carries out C to gas sensor_i-xConcentration calibration,Set up concentration ID table from low to high, in table 1; 2. the H of variable concentrations after demarcating₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The peak height that gas is corresponding is H_i-x, set up H_i-xID table, seeTable 2, wherein, i is gas component, x is in x kind concentration; 3. use Lagrangian methodRespectively the gas of each component is carried out to Mathematical Fitting: C_gas-i-detect=f（H_i), and calculateDraw the concentration value C of gas i_gas-i-detect, in table 3.

Step 5), according to formula

$C_{i-\mathrm{in}-\mathrm{oil}}=\frac{C_{\mathrm{gas}-i-\det \mathrm{ect}}*V_{\mathrm{gas}}}{(1-\mathrm{\&eta;})*V_{\mathrm{oil}-\mathrm{sample}}}$

Calculate the concentration C of gas component i in tested oil sample_i-in-oil, in table 3, wherein, η isStripping factor.

Table 3

Step 5), by the concentration C of gas component i_i-in-oilAccording to State Grid's standardThe event of the proposition in GBT7252-2001 " Gases Dissolved in Transformer Oil analysis and judge directive/guide "Barrier type judgement method, knows C₂H₂/C₂H₄，CH₄/H₂，C₂H₄/C₂H₆Ratio be 0.48,0.13,7.33, be encoded to 1,0,2, can judge measurand is the aging of transformerDegree and fault type are low energy electric discharge.

Embodiment 2

The transformer insulation oil oil sample that step 1) is 45ml to volume vacuumizes, and makes moltenThe mist of solution in insulating oil separates with oily, and after separating, mist place air chamber is overallAmass as 18.47ml.

Step 2), from isolated mist, extract the sample gas of certain volume.

Step 3), separates the gas mixing in described sample gas, isolates H₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Gas.

Step 4), measures respectively H by gas sensor₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The concentration C of gas_{gas-H2-detect}-concrete detecting step is: the H that 1. uses 10 kinds of variable concentrations₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Calibrating gas carries out C to gas sensor_i-xConcentration calibration,Set up concentration ID table from low to high, in table 1; 2. the H of variable concentrations after demarcating₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The peak height that gas is corresponding is H_i-x, set up H_i-xID table, seeTable 2, wherein, i is gas component, x is in x kind concentration; 3. use Lagrangian methodRespectively the gas of each component is carried out to Mathematical Fitting: C_gas-i-detect=f（H_i), and calculateDraw the concentration value C of gas i_gas-i-detect, in table 4.

Step 5), according to formula

$C_{i-\mathrm{in}-\mathrm{oil}}=\frac{C_{\mathrm{gas}-i-\det \mathrm{ect}}*V_{\mathrm{gas}}}{(1-\mathrm{\&eta;})*V_{\mathrm{oil}-\mathrm{sample}}}$

Calculate the concentration C of gas component i in tested oil sample_i-in-oil, as table 4 shows, wherein,η is stripping factor.

Table 4

Step 5), by the concentration C of gas component i_i-in-oilAccording to State Grid's standardThe event of the proposition in GBT7252-2001 " Gases Dissolved in Transformer Oil analysis and judge directive/guide "Barrier type judgement method, knows C₂H₂/C₂H₄，CH₄/H₂，C₂H₄/C₂H₆Ratio be 0.20,3.63,9.85, be encoded to 1,2,2, can judge measurand is the aging of transformerDegree and fault type are that low energy electric discharge is double overheated.

Embodiment 3

The transformer insulation oil oil sample that step 1) is 45ml to volume vacuumizes, and makes moltenThe mist of solution in insulating oil separates with oily, and after separating, mist place air chamber is overallAmass as 18.47ml.

Step 2), from isolated mist, extract the sample gas of certain volume.

Step 3), separates the gas mixing in described sample gas, isolates H₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Gas.

Step 4), measures respectively H by gas sensor₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The concentration C of gas_{gas-H2-detect}-concrete detecting step is: the H that 1. uses 10 kinds of variable concentrations₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Calibrating gas carries out C to gas sensor_i-xConcentration calibration,Set up concentration ID table from low to high, in table 1; 2. the H of variable concentrations after demarcating₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The peak height that gas is corresponding is H_i-x, set up H_i-xID table, seeTable 2, wherein, i is gas component, x is in x kind concentration; 3. use Lagrangian methodRespectively the gas of each component is carried out to Mathematical Fitting: C_gas-i-detect=f（H_i), and calculateDraw the concentration value C of gas i_gas-i-detect, in table 5.

Step 5), according to formula

$C_{i-\mathrm{in}-\mathrm{oil}}=\frac{C_{\mathrm{gas}-i-\det \mathrm{ect}}*V_{\mathrm{gas}}}{(1-\mathrm{\&eta;})*V_{\mathrm{oil}-\mathrm{sample}}}$

Calculate the concentration C of gas component i in tested oil sample_i-in-oil, as table 5 shows, wherein,η is stripping factor.

Table 5

Step 5), by the concentration C of gas component i_i-in-oilAccording to State Grid's standardThe event of the proposition in GBT7252-2001 " Gases Dissolved in Transformer Oil analysis and judge directive/guide "Barrier type judgement method, knows C₂H₂/C₂H₄，CH₄/H₂，C₂H₄/C₂H₆Ratio be 0.49,6.21,0.82, be encoded to 1,2,0, can judge measurand is the aging of transformerDegree and fault type are that low energy electric discharge is double overheated.

Above-mentioned example is just for illustrating the present invention, and embodiments of the present invention are not limited to theseExample, the various detailed description of the invention of inventive concept that what those skilled in the art made meetAll within protection scope of the present invention.

Claims (2)

1. the detection method of transformer degree of aging, is characterized in that, the method comprises the steps:

Step 1), be V to volume_oil-sampleTransformer insulation oil oil sample vacuumize, the mist that makes to be dissolved in insulating oil separates with oily, after separating, the cumulative volume of mist place air chamber is V_gas；

Step 2), from isolated mist, extract the sample gas of certain volume;

Step 3), the gas mixing in described sample gas is separated, isolate H₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Gas;

Step 4), measure respectively H by gas sensor₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The concentration C of gas_gas-i-detect；

Step 5), according to formula

Calculate the concentration C of gas component i in tested oil sample_i-in-oil, wherein, η is stripping factor;

Step 6), according to the concentration C of gas component i_i-in-oil, according to the fault type determination methods of the proposition in the standard GBT7252-2001 of State Grid " Gases Dissolved in Transformer Oil analysis and judge directive/guide ", analyze and judge transformer degree of aging and fault type;

Wherein, described step 4) described in gas sensor measure as follows H₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The concentration C of gas_gas-i-detect：

1. step, is used the H of several variable concentrations₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂Calibrating gas carries out C to gas sensor_i-xConcentration calibration, wherein, i is gas component, x is x kind concentration;

2. step, demarcates the H of rear variable concentrations₂、CO、CH₄、C₂H₄、C₂H₆、C₂H₂The peak height that gas is corresponding is H_i-x；

3. step, carries out Mathematical Fitting: C to the gas of each component respectively with Lagrangian method_gas-i-detect＝f(H_i), and calculate the concentration value C of gas i_gas-i-detect；

Wherein, i is gas component, and x is x kind concentration.

2. the detection method of transformer degree of aging as claimed in claim 1, is characterized in that, to described C_i-xWith described H_i-xSet up respectively ID table, the calibrating gas of every component is divided into 10 grades by concentration, in described ID table, is arranged in order from low to high.