CN2570802Y - Device for monitoring dissolved gas in transformer oil online - Google Patents

Abstract

The utility model belongs to the technical field of transformer monitoring, which relates to an online monitoring device for dissolved gas in transformer oil. The online monitoring device for dissolved gas in transformer oil comprises an intelligent sensor for gas in oil, the intelligent sensor is installed at the place of an oil drain valve on the bottom of the transformer, and electrical signals of the intelligent sensor is accessed to an industrial computer through an RS232 interface and a cable transmission line, the industrial computer can be used for gas content display and data format conversion of the signals, and the industrial computer can be connected with a background diagnostic process computer. The utility model can be used for on-line continuous monitoring of the gas content in the transformer oil, and whether the gas content in the transformer oil is over a limit can be understood at any time. When the gas content in the transformer oil is over the limit, corresponding measures can be taken in time, and the transformer breakdown can be avoided.

Description

Transformer oil dissolved gas on-Line Monitor Device

Technical field

The utility model belongs to transformer is carried out monitoring technical field, relates to a kind of transformer oil dissolved gas on-Line Monitor Device.

Background technology

The insulation of 110kV and above electric pressure power transformer is oil-paper composite insulation structure,, heat, under the synergy of machinery equal stress, insulating oil, insulating material such as paper and cardboard will be degraded aging gradually, produce various low molecular weight gas thereby decompose, these gases will be dissolved in the transformer oil to a certain extent, utilize the described method of IEC567 publication, can from oil sample, isolate these dissolved gases, and can further utilize chromatographic technique that it is carried out quantitative test, Here it is dissolved gas analysis (Dissolved Gas Analysis, be called for short DGA), or be called the oil chromatography analysis.Oil dissolved gas has reflected the fault state of transformer to a certain extent, and therefore the result according to stratographic analysis can diagnose the type and the order of severity of fault.To one of conventional important detection means of using of oil immersion power equipment, effect is remarkable on inner latency fault of diagnosis transformer and development degree thereof as electric system at present for it.Conventional stratographic analysis test is drawn oil sample on the transformer at the scene, delivers to testing laboratory again and carries out stratographic analysis, and the test period is long, and measurement result is easy to generate deviation.Particularly for those speed of developments insulation fault faster, often be difficult to timely discovery, if can carry out on-the-spot on-line monitoring to the transformer oil dissolved gas, in advance before transformer breaks down, capture some fault tendency information timely, each power supply unit to operation power all is highly significant so.

Summary of the invention

Technical problem to be solved in the utility model is that a kind of transformer oil dissolved gas on-Line Monitor Device will be provided, can monitor out oil tank of transformer oil dissolved gas amount continuously, in time understand the inner latency fault of transformer, take preventive measures and avoid the generation of fault.

The technical scheme that solution the utility model technical matters is adopted is that this transformer oil dissolved gas on-Line Monitor Device comprises gas intelligence sensor in the oil that is installed in fuel outlet valve place, transformer bottom, the electric signal of intelligence sensor inserts through RS232 interface and cable transmission line and can show gas content and this signal is carried out the industrial computer of Data Format Transform, also industrial computer can be connected with backstage diagnostic process computing machine with coaxial cablet through coaxial network interface card afterwards.The utility model can carry out on-line continuous to Gas in Oil of Transformer content constantly monitors, and whether contained gas flow in the transformer oil is exceeded standard, and can understand at any time, can in time take corresponding measure when situation occurring exceeding standard, avoids the generation of transformer fault.

Description of drawings

Below in conjunction with the embodiment accompanying drawing the utility model is described in further detail.

Fig. 1 the utility model structural representation

Fig. 2 schematic block circuit diagram of the present utility model

Fig. 3 intelligence sensor installation diagram

Among the figure: the three-core shielding cable 9-gas semi-permeable diaphragm 10-heating of industrial computer 5-coaxial cablet 6-backstage, 1-transformer body, 2-intelligence sensor, 3-quad signal transmssion line, 4-foreground diagnostic process computing machine 7-oil tank of transformer bottom fuel outlet valve 8-RS232 joint, (burning) chamber 11-simulating signal regulating circuit plate, 12-single-chip microcomputer, 13-copper sleeve, 14-heating plate, 15-HYDRAM201 sensor 16-master touches part, (CPU) part 19-terminal box is touched in the 18-input and output of 17-RS232 interface

Embodiment

Intelligence sensor (2) can adopt U.S. SERVERON company production and sales " gas chromatogram sensor in the oil " product, this sensor can detect eight kinds of gas markers of latent transformer fault, measurement range and precision are as follows: hydrogen (H2) 10-2,000PPM ± 10% acetylene (C2H2) 5-500PPM ± 1PPM or ± 10% second rare (C2H4) 7-2,000PPM ± 1PPM or ± 10% carbon monoxide (CO) 5-2,000PPM ± 1PPM or ± 10% methane (CH4) 70-2,000PPM ± 10% ethane (C2H6) 10-2,000PPM ± 10% oxygen (O2) 10-1,400PPM10% carbon dioxide (CO2) 5-7,000PPM ± 1PPM or ± 10%

Also adoptable another kind of intelligence sensor be Canadian SYPROTEC company produce and " Hydran201i gas monitoring system " equipment of sale in " intellectual transmitters of H201Ti " product (the Hydran201i gas monitoring system comprises several parts such as communication controller that are called the intellectual transmitters of H201Ti and are called H201Ci series, be exactly employed harvester hydran201Ti intellectual transmitters part in the utility model), Zong be used for the situation of appropriate hydrocarbon gas in the gas on-line monitoring transformer.Intellectual transmitters H201Ti among the Hydran201i, it has a little column type shell, this shell can directly install to the fuel outlet valve place of transformer by a brass connector, and a sensor, a sleeving temperature regulating system and a smart electronics forwarder that has microprocessor are housed in this shell.Also have terminal row in the shell for connecting AC power, the connector that a RS232 also is housed in the shell is connected with a quad signal transmssion line (3) with foreground industrial computer (4).The principle of work of H201Ti intellectual transmitters is summarized as follows: the inflammable gas in the transformer oil enters interior electrochemical gas detector---the heating chamber (10) of H201Ti intellectual transmitters by the film (9) that one deck has the selectivity ventilating performance, produces an electric signal that is directly proportional with reaction rate with the oxygen reaction in electrochemical gas detector.This electric signal is converted to digital signal by signal processing circuit (10) and the single-chip microcomputer (12) in the H201Ti intellectual transmitters.

Foreground industrial computer (4) is a data handling machine, adopt CPU:PIII850, there is backstage diagnostic process computing machine (6) to adopt CPU:PIII866, after being connected foreground industrial computer (4), (4) utilize the foreground capture program in the Foreground Data process computer, at first digital signal are carried out software filtering and smoothing processing, then according to the requirement of backstage diagnostic process computing machine (6) to the data form, digital signal is carried out format conversion, leave it in appointed positions at last.After backstage diagnostic process computing machine (7) is obtained needed data by coaxial cablet (5) to appointed positions, utilize independently developed comprehensive diagnos program, total hydrocarbon gas content electric signal and other desired signal are carried out overall treatment, provide diagnostic result at last.As when being judged as transformer operation overshoot scope, then send alerting signal, reminds people should be taked the generation of corresponding measure prevention transformer fault.Its course of work: the content (digital quantity of from transformer oil, measuring total appropriate hydrocarbon gas by Intelligence sensor (2), use the ppm value representation), by quad signal transmssion line (3) the THC gas flow (being digital signal this moment) that is measured is being transferred to this digital quantity by the RS232 serial ports in the Access database in the foreground industrial computer (4), software by establishment is shown by the industrial computer that is sent to the foreground after in the Access database of industrial computer (4) digital quantity of THC gas being read and this digital quantity is sent in the SQL database of foreground industrial computer, by coaxial network interface card (PCI-2029) transmission line to the SQL database of backstage diagnostic process computing machine (6), as the foundation of data analysis diagnosis.

Claims (1)

1, a kind of transformer oil dissolved gas on-Line Monitor Device, comprise and be installed in gas intelligence sensor (2) in the oil that transformer bottom fuel outlet valve (7) locates, the electric signal that it is characterized in that intelligence sensor (2) inserts through RS232 interface and cable transmission line (4) and can show gas content and this signal is carried out the industrial computer (4) of Data Format Transform, also industrial computer (4) can be connected with backstage diagnostic process computing machine (6) with coaxial cablet (5) through coaxial network interface card afterwards.

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