CN2569160Y - On-line monitor for insulation property of transformer sleeve - Google Patents
On-line monitor for insulation property of transformer sleeve Download PDFInfo
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- CN2569160Y CN2569160Y CN 02277290 CN02277290U CN2569160Y CN 2569160 Y CN2569160 Y CN 2569160Y CN 02277290 CN02277290 CN 02277290 CN 02277290 U CN02277290 U CN 02277290U CN 2569160 Y CN2569160 Y CN 2569160Y
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Abstract
The utility model relates to an on-line monitor for an insulation property of a transformer sleeve, which comprises a capacitive core-through sensor, wherein, final-screen ground wires of a three-phase sleeve are respectively penetrated through the capacitive core-through sensor (CT), a voltage signal of the final-screen current of the three-phase sleeve can be inducted by the capacitive core-through sensor, the voltage signal is input into a conditioning circuit board for linearity conditioning, amplification (attenuation), and filtering processing, and the voltage signal is output as a final-screen current signal of the three-phase sleeve. Three-phase output signals are input into a three-phase voltage summing circuit simultaneously, and three-phase unbalance voltage U0 is obtained and is used as a fourth output signal which is accessed into a computer through a data collection card with the three signals, wherein, the computer is used for carrying out software filtering and smoothing processing on digital signals, converting the format of the digital signals, storing the digital signals to a specified position, and indicating the digital signals. Electrical signals which are sensed by the sensor are amplified and can be monitored in time, regulation measures can be carried out by people in time or automatic processing can be carried out by an automatic control system, and a fault can be avoided.
Description
Technical field
The utility model belongs to transformer is carried out monitoring technical field, relates to a kind of bushing shell for transformer insulating property on-Line Monitor Device.
Background technology
Along with the develop rapidly of national economy and improving constantly of living standards of the people, more and more higher to the requirement of electric system reliability service; And power transformer is the hinge equipment of electric system, and its reliability of operation is directly connected to the safety and stablization of electric system.How guaranteeing the safe operation of up to ten thousand main-transformers in the electrical network, is a main direction of studying of power industry operation department.In order to monitor the fault tendency of main-transformer in advance, people have taked a lot of ways to come trouble-saving generation.For example just stipulate clearly in the electric power safety operating standard that the qualification phase is carried out preventative maintenance (5 years turn(a)rounds, 10 years overhaul phases) to main-transformer per year.But in actual motion, along with the raising of the electric pressure of transformer, the increase of separate unit capacity, the weak point of the pre-method for testing that regularly has a power failure becomes increasingly conspicuous, and has been difficult to provide in time, exactly the information of equipment real conditions.The one, because power failure prerun regularly is difficult in time find the fault that development is very fast; The 2nd, the trial voltage that is applied during owing to power failure prerun may consequently be difficult to find delicately defective far below the working voltage of equipment; For example add direct current 1-5kV surveying insulation resistance, to add and exchange 10kV surveying dielectric loss, this is for the transformer of 110-500kV, even passed through the test low like this trial voltage under, also is difficult to accurately be reflected in the information of moving truth under the high voltage.Problematic like this main-transformer differs and overhauls surely, and great amount of manpower and material resources has been wasted in no problem main-transformer maintenance again, but also can bring some new problems (tide etc. of experiencing as device).So how people carry out long term monitoring to transformer in some index of run duration in research again, prevent the generation of transformer burst accident.By 240 transformer fault reasons are added up, find since capacitance of bushing dismiss edge disruptive discharge just have 17, since the end of sleeve pipe screen capacitance plate punctures or over the ground discharge just have 4, its failure rate has reached 8.75%, so from above data and data presentation, the state of bushing shell for transformer occupies an important position in the status monitoring of transformer, by timely monitoring to bushing shell for transformer insulating property state, can in time understand the transformer fault that will occur, prevent the generation of transformer burst accident.
Summary of the invention
Technical problem to be solved in the utility model is that a kind of bushing shell for transformer insulating property on-Line Monitor Device will be provided, and makes people can understand the sleeve pipe insulating property state of the transformer in the duty at any time, for the normal operation of control transformer provides foundation.
The technical scheme that solution the utility model technical matters is adopted is that this bushing shell for transformer insulating property on-Line Monitor Device comprises condenser type punching sensor (CT), the end screen ground wire of three-phase sleeve pipe passes condenser type punching sensor (CT) respectively, induce three voltage signals of three-phase bottom shielding of bushing electric current respectively through condenser type punching sensor, this voltage signal is imported the modulate circuit plate through 4 core shielded cables, carry out linearity conditioning by modulate circuit, amplify (decay), Filtering Processing, export as three-phase bottom shielding of bushing current signal, simultaneously the three-phase output signal is input to the three-phase voltage summing circuit, obtain its three-phase imbalance voltage U 0, as the 4th output signal, with first three signal, pass through data cable, be sent to modulus capture card (ADLINK PCI-9113), is digital signal through the modulus capture card with analog signal conversion, be sent to the foreground industrial computer, call the foreground capture program, digital signal is carried out software filtering and smoothing processing and digital signal carried out format conversion deposit in the computing machine of assigned address and demonstration.
Under cover pipe insulation normal operation, the plenary capacitance electric current of sleeve pipe is a milliampere level, and when sleeve pipe generation insulation fault, the plenary capacitance electric current can obviously increase.The electric signal that goes out through sensor senses can be come out by monitoring in time through amplifying, and makes people in time take regulation measure or is handled automatically by automatic control system, avoids the generation of fault.
Description of drawings
Fig. 1 structural principle block diagram of the present utility model
Fig. 2 schematic block circuit diagram of the present utility model
Fig. 3 analog signal conditioner circuit theory diagrams
Fig. 4 neutral point voltage summing circuit schematic diagram
Among the figure: 1,2,3-condenser type punching sensor, 4-bottom shielding of bushing electric current extension line connection terminal 5-analog signal conditioner circuit 6-three-phase imbalance voltage summing circuit 7-modulate circuit plate 8-DB37 shielded cable 9-Foreground Data process computer 10-coaxial cablet, 11-backstage diagnostic process computing machine 12-modulus capture card (PCI-9113), 13-transformer body, 14-transformer condenser-type terminal 15-4 core shielded cable 16-conditioning rack 17-linearity modulate circuit 18-photoelectric isolating circuit 19-amplification (decay) filtering circuit X, Y, Z-transformer three-phase Capacitor sleeve pipe R-resistance R
W-variable change resistance C-electric capacity U
X, U
Y, U
ZElectric signal LC-the photoelectrical coupler of-three-phase sleeve pipe induction (adopting A4N25) A-operational amplifier D-diode J-wire jumper GND-ground connection
Embodiment
The range of the condenser type punching sensor (1) that we select is 0-25mA, and model is YA-XX-E4.1, the conditioning of signal
Acquired signal is nursed one's health, be meant after sensor sensing goes out voltage signal, at first will transmit to conditioning rack (16) through 4 cores (just, bearing signal, ground) shielded cable (15); Then by modulate circuit plate (7) with input signal linearityization, filtering, denoising and processing and amplifying.Figure 3 shows that signal I
XModulate circuit, be output as U
XVoltage signal, I
Y, I
ZModulate circuit identical with it.
In order to guarantee the versatility and the interference free performance of analog signal conditioner circuit (5), require the output signal of all the sensors (1,2,3) to unite, be defined as the signal of 0-12V.Below conditioning circuit board (7) is carried out system description:
Analog signal conditioner circuit (5) comprises linearity modulate circuit (17). photoelectric isolating circuit (18). and amplify (decay) filtering circuit (19), the function that need finish has: signal linearization, electrical isolation, amplification (decay), filtering and function such as power supply is provided.Photoelectric isolating circuit (18)
Because measuring-signal is from the higher transformer of voltage, so must carry out electrical isolation.Proper through considering to use photoelectrical coupler.The design has satisfied the function of electrical isolation.1) amplifies (decay) filtering circuit (19)
Amplification (decay), filtering circuit are designed to the link that can regulate enlargement factor according to the gain situation of front stage circuits, adopt traditional activated amplifier, wave filter.2. neutral point voltage summing circuit:
To amplify the output U of (decay) filtering circuit (19)
x.U
y.U
zBe input to the neutral point voltage summing circuit (6) among Fig. 4, at first form differential filtering circuit input signal is carried out Filtering Processing, carry out phase adjusted by the two-stage rheostat then, make three-phase (U by operational amplifier
x.U
y.U
z) output phase each differ from 120 degree, after the summation filtering circuit three-phase signal is sued for peace and Filtering Processing, and as neutral point unbalance voltage signal (U
0) output.3. analog to digital conversion and data processing
With front end simulating signal U
x.U
y.U
z, U
0Being sent to the modulus capture card (12) that is arranged in Foreground Data process computer (9) by DB37 shielded cable (8), is digital signal by the modulus capture card with analog signal conversion; Then, calling corresponding software by Foreground Data process computer (9) carries out software filtering and smoothing processing and digital signal is carried out format conversion being stored in assigned address and showing at Foreground Data process computer (9) to digital signal; Connect backstage diagnostic process computing machine (11) then.Modulus capture card (12) adopts ADLINKPCI-9113, Foreground Data process computer (9) adopts CPU:PIII 850, backstage diagnostic process computing machine (11) adopts CPU:PIII 866, in Foreground Data process computer (9), utilize independently developed foreground capture program, at first digital signal is carried out software filtering and smoothing processing, then according to the requirement of backstage diagnostic process computing machine (11) to the data form, digital signals format is converted to the desired storage format of SQL server database, leaves it in appointed positions at last.After backstage diagnostic process computing machine (11) is obtained needed data to appointed positions, utilize independently developed comprehensive diagnos program, the signal of three-phase casing current signal and three-phase imbalance voltage signal and other introducings is carried out overall treatment, provide diagnostic result at last.
Claims (3)
1. bushing shell for transformer insulating property on-Line Monitor Device, comprise condenser type punching sensor (1), the end screen ground wire that it is characterized in that this three-phase sleeve pipe passes condenser type punching sensor (CT) respectively, induce three voltage signals of three-phase bottom shielding of bushing electric current respectively through condenser type punching sensor, this voltage signal is imported the modulate circuit plate through 4 core shielded cables, carry out linearity conditioning by modulate circuit, amplify or decay, Filtering Processing, export as three-phase bottom shielding of bushing current signal, simultaneously the three-phase output signal is input to the three-phase voltage summing circuit, obtain its three-phase imbalance voltage U 0, as the 4th output signal, with first three signal, be sent to the modulus capture card by data cable, is digital signal through the modulus capture card with analog signal conversion, then digital signal is carried out software filtering and smoothing processing and digital signal is carried out format conversion deposit in the computing machine of assigned address and demonstration.
2. bushing shell for transformer insulating property on-Line Monitor Device according to claim 1 is characterized in that analog signal processing circuit comprises linearity modulate circuit (17), photoelectricity coupled circuit (18), amplifies (decay) filtering circuit (19).
3. bushing shell for transformer insulating property on-Line Monitor Device according to claim 1, it is characterized in that digital signal carried out software filtering and smoothing processing and digital signal is carried out format conversion that to deposit the computing machine of assigned address and demonstration (9) be the Foreground Data process computer, after connect backstage diagnostic process computing machine (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02277290 CN2569160Y (en) | 2002-09-18 | 2002-09-18 | On-line monitor for insulation property of transformer sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02277290 CN2569160Y (en) | 2002-09-18 | 2002-09-18 | On-line monitor for insulation property of transformer sleeve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2569160Y true CN2569160Y (en) | 2003-08-27 |
Family
ID=33740931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02277290 Expired - Fee Related CN2569160Y (en) | 2002-09-18 | 2002-09-18 | On-line monitor for insulation property of transformer sleeve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2569160Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100399036C (en) * | 2004-07-06 | 2008-07-02 | 特变电工沈阳变压器集团有限公司 | Transformer cannula test device and its test method |
| CN101793936A (en) * | 2010-02-11 | 2010-08-04 | 河南省电力公司商丘供电公司 | Insulation state online monitoring method for condenser type bushings |
| CN102346230A (en) * | 2011-09-21 | 2012-02-08 | 山东五岳电器有限公司 | Method and device for online detection of transformer sleeve |
| CN101846719B (en) * | 2009-11-25 | 2012-05-09 | 西安博源电气有限公司 | Transformer insulation state on-line monitoring device |
| CN102628905A (en) * | 2012-04-20 | 2012-08-08 | 北京诺德威电力技术开发有限责任公司 | Fault recognition device of high-voltage capacitance type equipment and application device thereof |
| CN104122455A (en) * | 2014-08-19 | 2014-10-29 | 国家电网公司 | Transformer paper oil insulation frequency domain dielectric response testing device with shield drivers |
| CN104297592A (en) * | 2014-10-09 | 2015-01-21 | 广西电网公司电力科学研究院 | Three-phase split transformer insulation monitoring signal centralized sampling device |
| CN110308378A (en) * | 2019-07-31 | 2019-10-08 | 保定河软机器人科技有限公司 | Railway locomotive high pressure pipe sleeve Insulation monitoring sensor |
| CN117970181A (en) * | 2024-03-27 | 2024-05-03 | 南方电网科学研究院有限责任公司 | Transformer bushing end screen ground fault detection device |
-
2002
- 2002-09-18 CN CN 02277290 patent/CN2569160Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100399036C (en) * | 2004-07-06 | 2008-07-02 | 特变电工沈阳变压器集团有限公司 | Transformer cannula test device and its test method |
| CN101846719B (en) * | 2009-11-25 | 2012-05-09 | 西安博源电气有限公司 | Transformer insulation state on-line monitoring device |
| CN101793936A (en) * | 2010-02-11 | 2010-08-04 | 河南省电力公司商丘供电公司 | Insulation state online monitoring method for condenser type bushings |
| CN102346230A (en) * | 2011-09-21 | 2012-02-08 | 山东五岳电器有限公司 | Method and device for online detection of transformer sleeve |
| CN102346230B (en) * | 2011-09-21 | 2014-04-09 | 山东五岳电器有限公司 | Method and device for online detection of transformer sleeve |
| CN102628905A (en) * | 2012-04-20 | 2012-08-08 | 北京诺德威电力技术开发有限责任公司 | Fault recognition device of high-voltage capacitance type equipment and application device thereof |
| CN104122455A (en) * | 2014-08-19 | 2014-10-29 | 国家电网公司 | Transformer paper oil insulation frequency domain dielectric response testing device with shield drivers |
| CN104297592A (en) * | 2014-10-09 | 2015-01-21 | 广西电网公司电力科学研究院 | Three-phase split transformer insulation monitoring signal centralized sampling device |
| CN110308378A (en) * | 2019-07-31 | 2019-10-08 | 保定河软机器人科技有限公司 | Railway locomotive high pressure pipe sleeve Insulation monitoring sensor |
| CN110308378B (en) * | 2019-07-31 | 2021-01-05 | 保定河软机器人科技有限公司 | Insulation detection sensor for high-voltage pipe sleeve of railway locomotive |
| CN117970181A (en) * | 2024-03-27 | 2024-05-03 | 南方电网科学研究院有限责任公司 | Transformer bushing end screen ground fault detection device |
| CN117970181B (en) * | 2024-03-27 | 2024-05-28 | 南方电网科学研究院有限责任公司 | Transformer bushing end screen ground fault detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: TEBIAN ELECTRIC APPARATUS STOCK CO., LTD. Free format text: FORMER NAME OR ADDRESS: XINJIANG TBEA ELECTRICAL CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Patentee after: Tebian Electrician Co., Ltd. Patentee before: Tebian Electrotechnical Co., Ltd., Xinjiang |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |