CN103293417A - Detection method of transformer aging degree - Google Patents

Abstract

The invention discloses a detection method of transformer aging degree. The method includes: 1, evacuating a transformer insulating oil sample with the volume Voil-sample, separating mixed gas dissolved in the insulating oil to ensure total volume of the mixed gas in a gas chamber to be Vgas after separation; 2, extracting a certain volume of sample gas from the separated mixed gas; 3, separating the mixed gas from the sample gas to obtain H2, CO, CH4, C2H4, C2H6 and C2H2; 4, measuring the concentration Cgas-i-detect of each of the H2, CO, CH4, C2H4, C2H6 and C2H2 by a gas sensor; 5, calculating according to a formula to obtain the concentration Ci-in-oil of a gas component I in the measured oil sample, Eta being degassing coefficient; and 6, analyzing and determining transformer aging degree and fault type by known methods according to the concentration Ci-in-oil of the gas component i.

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 the gas content that is dissolved in the transformer insulation oil to judge the method for transformer degree of aging.

Background technology

Analyze the component of oil dissolved gas and content and be and monitor one of effective measures of oil-filled electrical equipment safe operation, utilize the gc analysis oil dissolved gas to monitor that oil-filled electrical equipment safe operation has had the use experience in more than 40 year in China.Regulation according to " GB/7252-2001 transformer dissolved gas analysis and judgement guide rule ", this measuring method need be separated through the dissolved gas of taking a sample, deviate from from oil, gas sampling, gas, gas detects, know the peak calculates seven links such as peak, quantitative calculating, each link very important person is for participating in, cause error easily, bring very big influence for test repeatability and accuracy.

The release of transformer oil dissolved gas on-line monitoring method is several years only, obtain message from Operation of Electric Systems department feedback, the ruuning situation of several thousand transformer oil dissolved gas on-Line Monitor Device of An Zhuaning is also pessimistic at home, and problem mainly is that measuring error is bigger than normal.

Summary of the invention

At problems of the prior art, the detection method of transformer degree of aging of the present invention is being carried out a large amount of actual measurements, accumulated on a large amount of operating experience bases, work out a whole set of and separated synthetic study analyses such as link and tested gasometry calculating link from gas-oil separation link, mixed gas quantitative sample injection link, mixed gas, obtained a kind ofly based on online quantitative detection and the calculating of chromatographic technique to operating transformer insulating oil dissolved gas, and then drawn the method for transformer degree of aging.

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

Step 1) is V to volume _Oil-sampleThe transformer insulation oil oil sample vacuumize, the mixed gas that is dissolved in the insulating oil is separated with oil, the cumulative volume that separates mixed gas place, back air chamber is V _Gas

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

Step 3) is separated the gas that mixes in the described sample gas, isolates H ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Gas;

Step 4) is measured H respectively by gas sensor ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The concentration C of gas _Gas-i-detect

Step 5) is according to formula

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

Calculate the concentration C of gas composition i in the tested oil sample _I-in-oil, wherein, η is stripping factor;

Step 5) is according to the concentration C of gas composition i _I-in-oil, according to known method analysis and judgement transformer degree of aging and fault type.

Further, gas sensor is measured H as follows described in the described step 4) ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The concentration C of gas _Gas-i-detect:

1. step uses the H of some kinds of variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Calibrating gas carries out C to gas sensor _I-xConcentration calibration, wherein, i is gas composition, x is in the x kind concentration;

2. step demarcates the H of back variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The peak height of gas correspondence is H _I-x

3. step carries out mathematics match: 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 composition, and x is x kind concentration.

Further, to described C _I-xWith described H _I-xSet up ID table respectively, what every group of standard divided gas is divided into 10 grades by concentration, is arranged in order from low to high in described ID table.

Embodiment

Below the specific embodiment of the present invention is elaborated.

The online detection metering method of insulating oil dissolved gas of the present invention, this method comprises the steps:

Step 1) is V to volume _Oil-sampleThe transformer insulation oil oil sample vacuumize, the mixed gas that is dissolved in the insulating oil is separated with oil, the cumulative volume that separates mixed gas place, back air chamber is V _Gas

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

Step 3) is separated the gas that mixes in the described sample gas, isolates H ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Gas.

Step 4) is measured H respectively by gas sensor ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The concentration C of gas _Gas-i-detect, specifically detect step and be: the H that 1. uses 10 kinds of variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Calibrating gas carries out C to gas sensor _I-xConcentration calibration is set up concentration ID table from low to high, sees Table 1; 2. demarcate the H of back variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The peak height of gas correspondence is H _I-x, set up H _I-xID table, see Table 2, wherein, i is gas composition, x is in the x kind concentration; 3. respectively the gas of each component is carried out mathematics match: C with Lagrangian method _Gas-i-detect=f(H _i), and calculate the concentration value C of gas i _Gas-i-detect

Step 5) is according to formula

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

Calculate the concentration C of gas composition i in the tested oil sample _I-in-oil, wherein, η is stripping factor.

Step 5) is according to the concentration C of gas composition i _I-in-oil, according to the fault type determination methods of the proposition among the standard GBT7252-2001 of State Grid " transformer dissolved gas analysis and judgement guide rule ", analyze and judgement transformer degree of aging and fault type.

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

Gas	H 2	CO	CH 4	C 2H 4	C 2H 6	C 2H 2
							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 composition (unit: uv)

Embodiment 1

Step 1) is that the transformer insulation oil oil sample of 45ml vacuumizes to volume, and the mixed gas that is dissolved in the insulating oil is separated with oil, and the cumulative volume that separates mixed gas place, back air chamber is 18.47ml.

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

Step 3) is separated the gas that mixes in the described sample gas, isolates H ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Gas.

Step 4) is measured H respectively by gas sensor ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The concentration C of gas _Gas-i-detectThe concrete step that detects is: the H that 1. uses 10 kinds of variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Calibrating gas carries out C to gas sensor _I-xConcentration calibration is set up concentration ID table from low to high, sees Table 1; 2. demarcate the H of back variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The peak height of gas correspondence is H _I-x, set up H _I-xID table, see Table 2, wherein, i is gas composition, x is in the x kind concentration; 3. respectively the gas of each component is carried out mathematics match: C with Lagrangian method _Gas-i-detect=f(H _i), and calculate the concentration value C of gas i _Gas-i-detect, see Table 3.

Step 5) is according to formula

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

Calculate the concentration C of gas composition i in the tested oil sample _I-in-oil, see Table 3, wherein, η is stripping factor.

Table 3

Step 5) is with the concentration C of gas composition i _I-in-oilAccording to the fault type determination methods of the proposition among the standard GBT7252-2001 of State Grid " transformer dissolved gas analysis and judgement guide rule ", know C ₂H ₂/ C ₂H ₄, CH ₄/ H ₂, C ₂H ₄/ C ₂H ₆Ratio be 0.48,0.13,7.33, be encoded to 1,0,2, degree of aging and the fault type that can judge measurand and be transformer are the low energy discharge.

Embodiment 2

Step 1) is that the transformer insulation oil oil sample of 45ml vacuumizes to volume, and the mixed gas that is dissolved in the insulating oil is separated with oil, and the cumulative volume that separates mixed gas place, back air chamber is 18.47ml.

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

Step 3) is separated the gas that mixes in the described sample gas, isolates H ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Gas.

Step 4) is measured H respectively by gas sensor ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The concentration C of gas _{Gas-H2-detect}-specifically detect step and be: the H that 1. uses 10 kinds of variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Calibrating gas carries out C to gas sensor _I-xConcentration calibration is set up concentration ID table from low to high, sees Table 1; 2. demarcate the H of back variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The peak height of gas correspondence is H _I-x, set up H _I-xID table, see Table 2, wherein, i is gas composition, x is in the x kind concentration; 3. respectively the gas of each component is carried out mathematics match: C with Lagrangian method _Gas-i-detect=f(H _i), and calculate the concentration value C of gas i _Gas-i-detect, see Table 4.

Step 5) is according to formula

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

Calculate the concentration C of gas composition i in the tested oil sample _I-in-oil, show that as table 4 wherein, η is stripping factor.

Table 4

Step 5) is with the concentration C of gas composition i _I-in-oilAccording to the fault type determination methods of the proposition among the standard GBT7252-2001 of State Grid " transformer dissolved gas analysis and judgement guide rule ", know C ₂H ₂/ C ₂H ₄, CH ₄/ H ₂, C ₂H ₄/ C ₂H ₆Ratio be 0.20,3.63,9.85, be encoded to 1,2,2, can judge measurand and be the degree of aging of transformer and fault type and be that the low energy discharge is held concurrently is overheated.

Embodiment 3

Step 1) is that the transformer insulation oil oil sample of 45ml vacuumizes to volume, and the mixed gas that is dissolved in the insulating oil is separated with oil, and the cumulative volume that separates mixed gas place, back air chamber is 18.47ml.

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

Step 3) is separated the gas that mixes in the described sample gas, isolates H ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Gas.

Step 4) is measured H respectively by gas sensor ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The concentration C of gas _{Gas-H2-detect}-specifically detect step and be: the H that 1. uses 10 kinds of variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Calibrating gas carries out C to gas sensor _I-xConcentration calibration is set up concentration ID table from low to high, sees Table 1; 2. demarcate the H of back variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The peak height of gas correspondence is H _I-x, set up H _I-xID table, see Table 2, wherein, i is gas composition, x is in the x kind concentration; 3. respectively the gas of each component is carried out mathematics match: C with Lagrangian method _Gas-i-detect=f(H _i), and calculate the concentration value C of gas i _Gas-i-detect, see Table 5.

Step 5) is according to formula

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

Calculate the concentration C of gas composition i in the tested oil sample _I-in-oil, show that as table 5 wherein, η is stripping factor.

Table 5

Step 5) is with the concentration C of gas composition i _I-in-oilAccording to the fault type determination methods of the proposition among the standard GBT7252-2001 of State Grid " transformer dissolved gas analysis and judgement guide rule ", know C ₂H ₂/ C ₂H ₄, CH ₄/ H ₂, C ₂H ₄/ C ₂H ₆Ratio be 0.49,6.21,0.82, be encoded to 1,2,0, can judge measurand and be the degree of aging of transformer and fault type and be that the low energy discharge is held concurrently is overheated.

Above-mentioned example just is used for explanation the present invention, and embodiments of the present invention are not limited to these examples, and the various embodiments that meet inventive concept that those skilled in the art make are all within protection scope of the present invention.

Claims (3)

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

Step 1) is V to volume _Oil-sampleThe transformer insulation oil oil sample vacuumize, the mixed gas that is dissolved in the insulating oil is separated with oil, the cumulative volume that separates mixed gas place, back air chamber is V _Gas

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

Step 3) is separated the gas that mixes in the described sample gas, isolates H ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Gas;

Step 4) is measured H respectively by gas sensor ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The concentration C of gas _Gas-i-detect

Step 5) is according to formula

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

Calculate the concentration C of gas composition i in the tested oil sample _I-in-oil, wherein, η is stripping factor.

Step 5) is according to the concentration C of gas composition i _I-in-oil, according to known method analysis and judgement transformer degree of aging and fault type.

2. the detection method of transformer degree of aging as claimed in claim 1 is characterized in that, gas sensor is measured H as follows described in the described step 4) ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The concentration C of gas _Gas-i-detect:

1. step uses the H of some kinds of variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂Calibrating gas carries out C to gas sensor _I-xConcentration calibration, wherein, i is gas composition, x is in the x kind concentration;

2. step demarcates the H of back variable concentrations ₂, CO, CH ₄, C ₂H ₄, C ₂H ₆, C ₂H ₂The peak height of gas correspondence is H _I-x

3. step carries out mathematics match: 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 composition, and x is x kind concentration.

3. the detection method of transformer degree of aging as claimed in claim 2 is characterized in that, to described C _I-xWith described H _I-xSet up ID table respectively, what every group of standard divided gas is divided into 10 grades by concentration, is arranged in order from low to high in described ID table.