CN205301506U - Transformer partial discharge ultrasonic detection and fine positioning device - Google Patents
Transformer partial discharge ultrasonic detection and fine positioning device Download PDFInfo
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- CN205301506U CN205301506U CN201521063604.7U CN201521063604U CN205301506U CN 205301506 U CN205301506 U CN 205301506U CN 201521063604 U CN201521063604 U CN 201521063604U CN 205301506 U CN205301506 U CN 205301506U
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- 238000001514 detection method Methods 0.000 title abstract description 12
- 230000015654 memory Effects 0.000 claims abstract description 30
- 239000000523 sample Substances 0.000 claims abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000002604 ultrasonography Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 abstract description 14
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The utility model discloses a transformer partial discharge ultrasonic detection and fine positioning device connects sounding probe and the central controller who sets up on the oil tank lateral wall through the signal conversion channel board, and the signal conversion channel board is including the preamplifier, sampling holder, AD converter and the high -speed memory that cushions that connect gradually. Be applied to transformer tank's discharge detection with the sounding method, connect the sounding probe in parts such as central controller through the signal conversion channel board. The utility model discloses a device has clever lightness height, the degree of accuracy is high, and its testing process and result do not receive external disturbance's characteristics.
Description
Technical field
This utility model belongs to power transmission and transformation field, is specifically related to a kind of ultrasonic transmission characteristic utilizing and sending during shelf depreciation, detects and be accurately positioned the device of inside transformer shelf depreciation point.
Background technology
In large-scale power transformer, the measurement to partial discharge quantity is the inspection effective method of its insulation characterisitic. By measuring partial discharge quantity, it is possible to help engineers and technicians grasp the change procedure of the dielectric level of this equipment. But, it can not provide, to people, the position that its shelf depreciation occurs. In test at the scene, the position of shelf depreciation point is determined, is conducive to the correct judgement to some special shelf depreciation problem. It is known that in power transformer, the shelf depreciation that certain value occurs at some position is acceptable, but, major accident but can be caused to occur at certain key position. Therefore, in transformator, the determination of shelf depreciation point position, the result of measurement of partial discharge can not only be made good explanation, and, the maintenance tool of transformator defect is very helpful, may also help in the design improving transformator simultaneously.
Transformator ultrasound wave partial discharge monitoring method now, is utilize location at spherical surface method, hyperboloid location algorithm or other location algorithm to position. No matter adopt which kind of algorithm, during location adopt ultrasound wave at 20 DEG C of temperature in oil spread speed 1400m/s or other phase close values be calculated as constant. But ultrasound wave is transferred through the complex medias such as cardboard, oil, steel plate in inside transformer, the temperature of transformer oil differs widely also with ambient temperature, transformer load, the change of inside transformer diverse location, adopt a certain ultrasonic propagation velocity determined at temperature in oil to replace actual ultrasonic velocity to there is bigger error, but when detecting at the scene at present, do not have better way directly to determine the ultrasound wave equivalent velocity of wave in inside transformer unlike material and complicated temperature field.
Utility model content:
In order to overcome the defect of above-mentioned background technology, this utility model provides a kind of partial discharge of transformer ultrasound examination and accurate positioning device, utilize the ultrasound wave that field measurement obtains to calculate in the spread speed of inside transformer, and coordinate hyperboloid method to carry out being accurately positioned of inside transformer shelf depreciation point.
In order to solve above-mentioned technical problem adopted technical scheme of the present utility model it is:
A kind of partial discharge of transformer ultrasound examination and accurate positioning device, including central controller, and it is connected to microprocessor and the control panel of central controller, also include several sounding being arranged on oil tank of transformer sidewall probe, each sounding probe each connects a signal ALT-CH alternate channel plate, and each signal ALT-CH alternate channel plate is connected to central controller by bus; Amplifier that signal ALT-CH alternate channel plate includes being sequentially connected with, sampling holder, A/D converter, cache memory, the input of preamplifier is for from sounding probe received signal, and the outfan of cache memory is used for connecting central controller.
It is preferred that each sounding probe is connected to channel plate by harvester.
It is preferred that sounding probe is at least 6, each sounding probe is randomly provided on the sidewall of oil tank of transformer.
It is preferred that the outfan of microprocessor is connected to draft machine, disc unit and display.
It is preferred that cache memory is 128K memory, bus includes controlling bus, data/address bus and address bus.
The beneficial effects of the utility model are in that: sound detection is applied to the discharge examination of oil tank of transformer by device described in the utility model, and by signal ALT-CH alternate channel plate, sounding probe is connected to the parts such as central controller. Sound detection belongs to Non-Electricity Measurement, due to this Non-Electricity Measurement in the measurements not by extraneous electric interference, therefore has its clear advantage. According to hyperacoustic direction propagation characteristic, having certain direction propagation speed in certain medium, the position measuring shelf depreciation with it also has higher practical value. Having clever lightness height, accuracy height by device of the present utility model detection and orientation discharge source, its detection process and result be not by external interference.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram of this utility model embodiment;
Fig. 2 is the structural representation of this utility model embodiment signal ALT-CH alternate channel plate.
In figure: 1-central controller, 2-microprocessor, 3-control panel, 4-signal ALT-CH alternate channel plate, 5-preamplifier, 6-sampling holder, 7-A/D transducer, 8-cache memory, 9-draft machine, 10-disc unit, 11-display, 12-bus.
Detailed description of the invention
Below in conjunction with drawings and Examples, this utility model is described further.
The present embodiment provides a kind of partial discharge of transformer ultrasound examination and accurate positioning device, including central controller 1, and it is connected to microprocessor 2 and the control panel 3 of central controller 1, oil tank of transformer sidewall is provided with at least 6 sounding probes, each sounding probe random arrangement on the sidewall of described fuel tank.
Each sounding probe connects a signal ALT-CH alternate channel plate 4 each via a harvester, and each signal ALT-CH alternate channel plate 4 is connected to central controller 1 by bus 12; Preamplifier 5 that signal ALT-CH alternate channel plate 4 includes being sequentially connected with, sampling holder 6, A/D converter 7, cache memory 8, the input of preamplifier 5 is for from sounding probe received signal, and the outfan of cache memory 8 is used for connecting central controller 1. Cache memory 8 is 128K memory, and bus 12 includes data/address bus, data/address bus and address bus. The outfan of microprocessor 2 is connected to draft machine 9, disc unit 10 and display 11, is used for exporting and showing result of calculation.
Each signal ALT-CH alternate channel is all controlled by internal data bus by central controller 1, can gather signal simultaneously. The state of central controller 1 controls and some operational orders can be set by control panel 3 or controls to carry out by microprocessor 2.
Ultrasonic signal converts analogue signal to via harvester, analogue signal inputs to signal ALT-CH alternate channel plate 4, by the preamplifier 5 of signal ALT-CH alternate channel plate 4, it is amplified, A/D converter 7 converts digital signal to, and these digital signals are sent in the cache memory 8 of 128kB temporary under operation control. After analogue signal is changed, under the effect of central controller 1, state " will be write " and become reading state. Under reading state state, these digital signals being temporarily stored in 128K memory read successively repeatedly, D/A change-over circuit digital signal is become analog signal output.
Under the control of microprocessor 2, the digital signal under " reading " state state timesharing can enter microprocessor 2 internal memory. These digital signals can be analyzed processing by special software, its primary signal, and intermediate processing results and final process result all can send into disk non-recoverable storage, and these information can also recall in feeding 128K cache memory 8 when needed from disk.
Signal ALT-CH alternate channel plate 4 has been that analogue signal becomes digital signal and carries out the entity of information temporary storage, and it is made up of preamplifier 5, sampling holder 6, A/D converter 7, these several parts of cache memory 8.
Preamplifier 5 bandwidth of operation is DC:0��200kHz, AC:20��200kHz, has five grades of gain control, input voltage range is �� 0.1V, �� 0.3V, �� 1V, �� 3V, �� 10V, its input impedance, more than 1M ��, adopts high resistant isolation input mode. It is made up of two high speed integrated transporting dischargings.
Sampling holder 6 is one and has signal input, the circuit that the analog gate that signal output and external command control forms, it has two stable duties: (1) sampling tracking mode, during this period, it accepts input signal as quickly as possible and verily follows the tracks of it until receiving maintenance instruction; (2) keep state, be docked to and keep the front flashy signal of instruction to keep. In general, desirably sampling, maintenance not easily realize. In the sampling holder 6 of upper figure, have employed two high speed integrated transporting dischargings, with but as far as possible accelerate settling time, reduce the leakage of electric capacity, in order to reduce detection time and keep the sampling instants impact on A/D conversion accuracy, circuit have employed the way avoiding transition (spike) phase in sequential.
A/D converter 7 is critical component of the present utility model, and its fastest switching rate is 0.5 �� s, and the A/D conversion of ultrasound positioning system have employed method of successive comparison, and dominant frequency is 10MHz, and point ten beats complete sample conversion and dump the work of three links. Gradually comparand register have employed the high speed TTL integrated package of 74S series.
Cache memory 8,128K memory is the buffering of A/D, A/D often completes once to change, just transformation result is sent into this 128K cache memory 8, under the control of bus 12, except A/D result can being sent into memory, it is possible to the data sent by computer are sent into this memory or storage signal is read in computer. The data exchange rate of computer and memory is up to 100kB/s.
Each channel plate shares data/address bus, data/address bus and address bus, and time sequential pulse and operational order that these buses 12 are found by central controller 1 and microprocessor 2 respectively control
Central controller 1 forms the central hub of instrument sequential and control command, controlled state with panel control switch.
Being arranged at the timing sequencer of control panel 3 for being supplied to the various operating impulse of A/D converter 7, A/D converter 7 completes sampling under the control of these clock pulses and keeps the overall process of conversion storage. The work that sequential occurs is controlled to carry out by clock and frequency dividing chronotron, and the dominant frequency of clock is 10MHz, and frequency dividing chronotron is made up of four decade computers, and initial value manually can be arranged by the dialing dish on panel. During by " always clear ", the predetermined value on dialing dish squeezes into enumerator, and this setting value is delay time. After delay time squeezes into enumerator, if frequency dividing duty under, must also by frequency dividing the time by same driver chuck, preset separately. When instrument startup work, sampling rate is then undertaken by number preset on dial.
Be arranged at control panel 3 preposition/the optional Signal trigger mode two kinds different of delay switch. Initial status, namely preserves the information of some sampled points before signal arrives, and the number of preservation can be determined by software. Under initial status, the triggering mode of signal is mutually trigger between passage, and the door that signal triggers manually can be set by " triggering level " knob. When signal Zhong Mou road, road signal is beyond when triggering door, signal amplitude descriminator sends a negative pulse makes signal condition indicator overturn, and notifies computer by interrupt mode. Before signal arrives; system conversion is carrying out; now the address sequence of memory is it is believed that a ring (loop), and after computer obtains interrupt signal, computer is fetched in address when being arrived by signal immediately; after the lead time computing of this address and software set; stopper is beamed back comparator, and when memory address is consistent with stopper, a halt instruction then sent out by comparator; make complete machine stop A/D conversion, complete and trigger the startup working cycle under preposition mode. When Time-delayed trigger state is to be started by external synchronization signal, just start system starts. All switches arrange whole programme-control.
The cache memory 8 of each signal ALT-CH alternate channel plate 4 can be written and read operation by computer respectively, and memory has three kinds of working method (1) A/D buffer memorys; (2) computer read-write; (3) D/A output.
The sound detection of the present embodiment application belongs to Non-Electricity Measurement, due to this Non-Electricity Measurement in the measurements not by extraneous electric interference, therefore has its clear advantage. Due to modern age efficiency of electro-acoustic transducer raising and the development of electronics amplifying technique, the sensitivity of sound detection improves a lot, and now for the test product of high capacitance, such as the power capacitor of more than �� F, its sensitivity is low unlike electrical measuring method. It addition, according to hyperacoustic direction propagation characteristic, certain medium has certain direction propagation speed, it is possible to measure the position of shelf depreciation with it. Current sound detection has obtained practical application in the Partial Discharge Detection of the electrical equipment such as power capacitor, power transformer.
It should be appreciated that for those of ordinary skills, it is possible to improved according to the above description or converted, and all these are improved and convert the protection domain that all should belong to this utility model claims.
Claims (5)
1. a partial discharge of transformer ultrasound examination and accurate positioning device, including central controller (1), and it is connected to microprocessor (2) and the control panel (3) of described central controller (1), it is characterized in that: also include several sounding being arranged on described oil tank of transformer sidewall probe, each described sounding probe each connects signal ALT-CH alternate channel plate (4), and each described signal ALT-CH alternate channel plate (4) is connected to described central controller (1) by bus (12);Preamplifier that described signal ALT-CH alternate channel plate (4) includes being sequentially connected with, sampling holder (6), A/D converter (7), cache memory (8), the input of described preamplifier (5) is for from described sounding probe received signal, and the outfan of described cache memory (8) is used for connecting described central controller (1).
2. a kind of partial discharge of transformer ultrasound examination according to claim 1 and accurate positioning device, it is characterised in that: each described sounding probe is connected to described channel plate by harvester.
3. a kind of partial discharge of transformer ultrasound examination according to claim 1 and accurate positioning device, it is characterised in that: described sounding probe is at least 6, and each described sounding probe is randomly provided on the sidewall of oil tank of transformer.
4. a kind of partial discharge of transformer ultrasound examination according to claim 1 and accurate positioning device, it is characterised in that: the outfan of described microprocessor (2) is connected to draft machine (9), disc unit (10) and display (11).
5. a kind of partial discharge of transformer ultrasound examination according to claim 1 and accurate positioning device, it is characterized in that: described cache memory (8) is 128K memory, described bus (12) includes controlling bus, data/address bus and address bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521063604.7U CN205301506U (en) | 2015-12-17 | 2015-12-17 | Transformer partial discharge ultrasonic detection and fine positioning device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521063604.7U CN205301506U (en) | 2015-12-17 | 2015-12-17 | Transformer partial discharge ultrasonic detection and fine positioning device |
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| CN205301506U true CN205301506U (en) | 2016-06-08 |
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| CN201521063604.7U Expired - Fee Related CN205301506U (en) | 2015-12-17 | 2015-12-17 | Transformer partial discharge ultrasonic detection and fine positioning device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425128A (en) * | 2015-12-17 | 2016-03-23 | 国家电网公司 | Partial discharge ultrasonic detection and accurate positioning device and method for transformer |
| CN112213585A (en) * | 2020-10-10 | 2021-01-12 | 国网山东省电力公司枣庄供电公司 | High-voltage switch cabinet partial discharge positioning method and system considering temperature field change |
-
2015
- 2015-12-17 CN CN201521063604.7U patent/CN205301506U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425128A (en) * | 2015-12-17 | 2016-03-23 | 国家电网公司 | Partial discharge ultrasonic detection and accurate positioning device and method for transformer |
| CN112213585A (en) * | 2020-10-10 | 2021-01-12 | 国网山东省电力公司枣庄供电公司 | High-voltage switch cabinet partial discharge positioning method and system considering temperature field change |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160608 Termination date: 20201217 |