CN101451899A - Water detecting and diagnosing method in filling transformer - Google Patents

Abstract

The invention relates to the field of oil-filled electrical transformer, specifically a detecting fault diagnosing method for the interior of oil-filled electrical transformer. The detecting fault diagnosing method compromises the use of gas chromatography detection of insulating oil in the concentration of hydrogen; gas chromatograph with tracking and measuring the concentration of other hydrocarbons: When the concentration of hydrogen than 1000ul/L, the measurement of CH4, C2H2, C2H4and C2H6 concentration; judgments: When the CH4, C2H2, C2H4and C2H6 concentration of the same or change slowly and the total gas volume of hydrogen 90%, the diagnosis of the transformer, there are a result of moisture into the water. As a result of the above-mentioned technical solution, the oil-filled transformers to resolve the causes of internal water detection problem, in order to correctly handle the internal transformer provides the basis for the water.

Description

The detection diagnostic method of filling transformer inner inlet

Technical field

The present invention relates to the filling transformer field, relate in particular to a kind of detection diagnostic method of filling transformer inner inlet.

Background technology

The sealing of some open filling transformer transformers is not ideal enough, can cause humid air to enter transformer-cabinet by all kinds of valves of transformer and the weld seam of heat radiator and the oiling part lid and all kinds of sealing place of conservator, forms moisture content.And when the oily situation of insulating oil did not have aging sign and demulsification ability strong, the water that enters humid air formation can accumulate in the bottom in bottom half (density difference).And fuel outlet valve is arranged on top, case bottom usually, so this part water can not can not put.Also filter with the method for vacuum oil strain and not go, main cause is because this part water does not participate in oil strain, and deposits at bottom half.

Transformer is inner in case water inlet can be quickened the aging of insulating oil oil, and the further emulsification of moisture content meeting is to insulating oil, and the emulsified water of insulating oil inside, can be adsorbed by solid insulation, further cause insulation low, thereby cause the discharge fault of transformer inside and damage.Therefore, whether detect filling transformer inside because the water inlet of above-mentioned reason is extremely important to the maintenance of transformer.

Summary of the invention

The objective of the invention is to solve the detection problem of the reason of above-mentioned filling transformer inner inlet, a kind of detection diagnostic method of filling transformer inner inlet is provided.

Realize that the object of the invention technical scheme is: a kind of detection diagnostic method of filling transformer inner inlet comprises the steps:

A, detect the concentration of hydrogen in the insulating oil with gas chromatograph;

B, with the concentration of other hydro carbons of gas chromatograph tracking measurement: when the concentration of hydrogen during, measure CH greater than 1000ul/L ₄, C ₂H ₂, C ₂H ₄And C ₂H ₆Concentration;

C, judgement: work as CH ₄, C ₂H ₂, C ₂H ₄And C ₂H ₆Concentration constant or change slowly and hydrogen accounts for 90% o'clock of total gas volume, the water because of making moist is into arranged in the diagnosis transformer.

Owing to adopted above-mentioned technical solution, solved the detection problem of the reason of filling transformer inner inlet, for the correct transformer inner inlet of handling provides foundation.

Embodiment

Below the present invention is described in further detail.

Transformer is in when operation, under effect of electric field, and the further ionization of water, chemical equation is as follows:

2H ₂O→2H ₂↑+O ₂↑

In insulating oil, dissolve H ₂And O ₂The H during dissolved gas analysis of insulating oil ₂Dense, be different from internal discharge and local discharge generation H ₂In case insulating oil has dissolved H ₂The dissolved gas of from insulating oil, deviating from, in gas chromatograph, analyze the plate theory of mixed gas through chromatographic column repeated dispensing balance between the two-phase of solid phase and moving phase, the component of final different volatile grade is separated from one another, what volatile grade was big flows out behind post at first, enter thermal conductivity cell detector and detect, just can be to H ₂Carry out qualitative and quantitative analysis, pass through again calibrating gas quantitatively, can be correctly to the paced work of all kinds of single components.

In case from the dissolved gas analysis of insulating oil, H ₂During 1000ul/L, and through trace analysis, H ₂Content constantly rises, and other hydro carbons such as C ₂H ₂Concentration does not have, C ₂H ₄And C ₂H ₆When concentration is constant, CH wherein ₄Increases slowly, wherein H ₂When volume accounted for other hydro carbons indexs 90%, can be diagnosed as transformer inside had moisture content.

Embodiment

Steelworks electric furnace unit continuous casting 1# transformer, manufacturer: Zhejiang San Men.Its major parameter is: voltage combination: 10/0.4kV; Capacity: 1000kVA.

This transformer is the important power-supply unit of electric furnace continuous casting, finds hydrogen content severe overweight in the oil in the controlled period sampling test, substantially exceeds the demand value of 150ul/L.Owing to be to carry out gas content detection in the oil first, can not judge definitely that to gas source in the oil oil strain processing is carried out at the requirement scene, and then the situation of change of observing gas content in the oil.

After oil strain was carried out at the scene, in short 5 months time, the 266.8ul/L when hydrogen content is from oil strain in the oil increased fast and reaches 2025ul/L, and its rate of rise is very fast, but in the oil other component content all in normal range, basic no change.Data are as follows:

Analyze:

After the oil strain processing, hydrogen still can not get effective control in the oil, illustrates that simple oil strain processing can not tackle the problem at its root.Whether gas data analysis from oil is considered transformer body watered and wetting and is caused.

Be generally the transformer body and contain moisture, the decomposition of water and with the reaction of iron be the result who produces hydrogen, so there is the water mark in diagnosis for transformer inside, suggestion is hung heart processing and is searched hidden danger.Subsequently, this transformer stops labour and hangs heart inspection, after insulating oil is extracted out, finds that there is the vestige of scale in the transformer tank bottom, proves the correctness of above-mentioned judged result.This equipment recovers normal operation after treatment.

Above-mentioned detection method repeatedly being verified in the practice, has all obtained right judgement.

Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique, under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.

Claims (1)

1, a kind of detection diagnostic method of filling transformer inner inlet is characterized in that, comprises the steps:

A, detect the concentration of hydrogen in the insulating oil with gas chromatograph;

B, with the concentration of other hydro carbons of gas chromatograph tracking measurement: when the concentration of hydrogen during, measure CH greater than 1000ul/L ₄, C ₂H ₂, C ₂H ₄And C ₂H ₆Concentration;

C, judgement: work as CH ₄, C ₂H ₂, C ₂H ₄And C ₂H ₆Concentration constant or change slowly and hydrogen accounts for 90% o'clock of total gas volume, the water because of making moist is into arranged in the diagnosis transformer.