CN203759183U - Generator stator bar insulation online detection device based on gas detection - Google Patents
Generator stator bar insulation online detection device based on gas detection Download PDFInfo
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- CN203759183U CN203759183U CN201320716618.9U CN201320716618U CN203759183U CN 203759183 U CN203759183 U CN 203759183U CN 201320716618 U CN201320716618 U CN 201320716618U CN 203759183 U CN203759183 U CN 203759183U
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- gas sensor
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Abstract
A generator stator bar insulation online detection device based on gas detection comprises a first gas sensor used for detecting the concentration of O3, a second gas sensor used for detecting the concentration of NO, and a third gas sensor used for detecting the concentration of NO2, wherein the first gas sensor, the second gas sensor and the third gas sensor are located in an electric generator wind tunnel, the first gas sensor, the second gas sensor and the third gas sensor are connected with a signal collecting/processing module, the signal collecting/processing module is connected with a terrain processing module, and the terrain processing module is connected with an upper computer, an alarm device and a liquid crystal display screen. According to the generator stator bar insulation online detection device, generation stator insulation online detection can be conveniently achieved. The gas sensors, a temperature sensor and a humidity sensor are high in measurement accuracy, high in stability, very high in anti-interference capacity, small in size, extremely low in cost, extremely convenient to install and maintain and easy to popularize.
Description
Technical field
A kind of generator stator bar Insulation Live Testing device detecting based on gas of the utility model, for judging the state of insulation of generator stator bar.
Background technology
Generator is called as electric system " heart ", and can it safety, reliability service, not only affects power supply quality, is also related to the stability of whole electric system.And the operational reliability of generator and stator bar insulating property are closely related, owing to being subject under the effects such as electric field, thermal field, mechanical stress, environmental factor, generator stator bar insulation is aging gradually, insulating property decline gradually, easily cause insulation breakdown and cause equipment failure, therefore, the insulation of generator stator bar is carried out to state-detection, can make prediction to the reliability of insulation and the residual life of insulation, thereby find as early as possible insulation defect, rationalization's maintenance of equipment or replacing, avoid some potential faults to occur.
At present, operation power part is mainly to carry out preventative maintenance, i.e. routine test and maintenance to power equipment, this has played better effect to minimizing and Accident prevention, then preventative maintenance is that off-line carries out, and needs to have a power failure to test, and easily causes excessive maintenance or maintenance not enough.Just because of making regular check on and maintenance exists many deficiencies, greatly developing to detect online at present or state-detection is basic State Maintenance.Conventionally insulation, in aging process, can be accompanied by the change of many electric parameters and non-electric quantity, these quantity of states changed over the important evidence in insulation detection.To stator bar, insulation detects major part all around detecting discharge pulse signal both at home and abroad at present, and these methods are the most direct, and sensitivity is higher.But be easily subject to various impulse disturbances, device is complicated, and cost is higher, and install, safeguard also comparatively difficult.
Summary of the invention
The purpose of this utility model is to provide a kind of generator stator bar Insulation Live Testing device detecting based on gas.The principle detecting based on gas, airborne by hydraulic generator unit operational process: O
3, NO and NO
2gas concentration detects, the state of insulation of judgement generator stator bar.
The technical scheme that the utility model is taked is: the generator stator bar Insulation Live Testing device detecting based on gas, comprising: for detection of O
3the first gas sensor of concentration, for detection of the second gas sensor of NO concentration, for detection of NO
2the 3rd gas sensor of concentration, described the first gas sensor, the second gas sensor, the 3rd gas sensor are arranged in generator wind-tunnel; Described the first gas sensor, the second gas sensor, the 3rd gas sensor connect respectively signals collecting/processing module, and signals collecting/processing module connects terrain processing module, and terrain processing module connects host computer, warning device and LCDs.
Described the first gas sensor, the second gas sensor, the 3rd gas sensor are: ozone sensor MQ131.
Described signals collecting/processing module by: signal processing module and A/D acquisition module connect and compose.Described signals collecting/processing module connects temperature sensor, humidity sensor.
Described terrain processing module connects host computer by RS-232 serial bus.Described terrain processing module is single chip processing module.
A kind of generator stator bar Insulation Live Testing device detecting based on gas of the utility model, can conveniently realize the online detection of generator stator insulator.The measuring accuracy of gas sensor, temperature sensor and humidity sensor is high, good stability, and jamproof very capable, volume is little, and cost is extremely low, and installation and maintenance are very convenient, easily popularize.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail:
Fig. 1 is the utility model on-line measuring device structural representation.
Fig. 2 is the utility model on-line measuring device main circuit diagram.
Fig. 3 is the utility model on-line measuring device peripheral circuit diagram.
Fig. 4 is the utility model ozone sensor MQ131 testing circuit figure.
Embodiment
Principle of work:
The major insulation of generator stator bar adopt epoxy mica powder for basis, epoxy resin be tackifier, glass fiber-reinforced thermosetting composite insulating material, this composite insulating material is in middle generation thermal degradation and heat (oxidation) embrittlement of the process of heat ageing, can there is thermal expansion in polymkeric substance simultaneously, cause shelling between major insulation and wire, layering, produces space.Can there is shelf depreciation at electric field action in these gaps, the free O of generation occurs gas
3, O
3be easy to again N
2the combination reaction that reacts produces NO, NO
2.Therefore core of the present utility model is exactly in the operational process of hydraulic generator unit, to three kinds of gas: O in generator wind-tunnel air
3, NO and NO
2the concentration of these three kinds of gases detects online, according to gas concentration, infers insulation defect.
The generator stator bar Insulation Live Testing device detecting based on gas, comprising: the detection technique of mixed gas, adopts gas sensor to O
3, NO and NO
2gas concentration detect, the gas concentration value threshold value of three kinds of gases, the variation tendency threshold value of concentration and the proportion threshold value of concentration are set, by detecting the destructiveness of actual value judgement generator stator bar insulation.For detection of O
3the first gas sensor of concentration, for detection of the second gas sensor of NO concentration, for detection of NO
2the 3rd gas sensor of concentration, described the first gas sensor, the second gas sensor, the 3rd gas sensor are arranged in generator wind-tunnel.
Described the first gas sensor, the second gas sensor, the 3rd gas sensor connect respectively signals collecting/processing module, and signals collecting/processing module connects terrain processing module, and terrain processing module connects host computer, warning device and LCDs.LCDs can display measurement value and concentration threshold; Described terrain processing module connects host computer by RS-232 serial bus.Host computer is used for save data and movement order and to terrain processing module, the concentration threshold of system is modified.
Described signals collecting/processing module by: signal processing module and A/D acquisition module connect and compose.Described terrain processing module is single chip processing module.
Described gas sensor induction gas changes, through signal processing module, converting to can be for the voltage signal of A/D acquisition module identification or the signal of single chip processing module Direct Recognition, single chip processing module is controlled A/D acquisition module several signals is carried out to A/D collection, single chip processing module calculates corresponding gas concentration after to multi-data processing, and measured value liquor charging crystal display screen is shown in real time.Reaching concentration threshold value just provides warning device and sends alerting signal.Instruct operations staff to carry out testing in depth testing to equipment, maintenance.Single chip processing module sends to host computer by serial ports by data simultaneously.Host computer is stored historical data, so that query analysis in the future; Host computer also can defeatedly transmit data to the modification that terrain processing module is carried out concentration threshold.
Power acquisition 220V AC power, by transformer and filter circuit of pressure-stabilizing, output direct current 5V, to device power supply.
Described the first gas sensor adopts ozone sensor MQ131.Single-chip microcomputer adopts the ATmega16 of AVR.
Described temperature sensor adopts DS18b20, and described humidity sensor adopts HS1101.
Described LCDs adopts lm240128r.
Ozone sensor MQ131 has higher sensitivity to ozone, needs heating voltage V during this working sensor
hwith test voltage V
c, its test circuit as shown in Figure 2 and Figure 3.V wherein
hfor suitable working temperature, V are provided to sensor
cfor measuring the voltage V on the pull-up resistor RL connecting with sensor
rL.In order to simplify the supply voltage of whole device, by heating voltage V
hall select DC5V with test voltage VC, the voltage V on pull-up resistor RL
rLcan directly as A/D, gather the voltage V on pull-up resistor RL
rLvariation reflected the variation of ozone concentration.Because temperature and humidity has considerable influence to ozone sensor MQ131, in order accurately to measure ozone concentration, whole device has also added temperature sensor DS18b20, humidity sensor HS1101, measure real-time environment temperature and humidity, according to typical case's temperature, the moisture curve of ozone sensor MQ131, measurement result is revised again, made measuring accuracy higher.
Temperature sensor DS18b20 is the one-line digital temperature sensor that DALLAS company produces, and its hardware circuit is extremely simple, only need to take an IO mouth of single-chip microcomputer.The volume that DS18b20 is extra small, ultralow hardware cost, all temperature detection and numerical data output are all integrated in a chip, and single-chip microcomputer carries out the processing of accurate sequential to DS18b20, can read the digital quantity of temperature.
Humidity sensor adopts capacitive sensor HS1101, a capacitor element of equivalence in circuit, and its electric capacity increases along with the increase of surveyed air humidity, by forming oscillatory circuit with NE555, electric capacity is transformed into frequency signal, by single-chip microcomputer, is gathered.By in HS1101 and NE555 while place in circuit, as shown in Figure 2.The simplified summary of NE555 circuit function is: when 6 ends and 2 ends are input as " 1 " simultaneously, 3 ends are output as " 0 "; When 6 ends and 2 ends are input as " 0 " simultaneously, 3 ends are output as " 1 ".In this circuit, 555 timers just according to this function as multistable trigger output frequency signal.When power connection, due to be input as " 0 " of 6 and 2 ends, timer 3 pin are output as " 1 "; Again because C1 both end voltage is 0, therefore V
cCby R2 and R3, C1 is charged, when C1 both end voltage reaches 2/3V
cCtime, timing circuit upset, output becomes " 0 ".Now the base voltage of the electric discharge BJT of 555 timer inside is " 1 ", electric discharge BJT conducting, thus capacitor C 1 is discharged by R3 and internal discharge BJT, when C1 both end voltage is reduced to 1/3V
cCtime, timer overturns again, makes output become " 1 ", internal discharge BJT cut-off, V
cCstart again by R2 and R3, C1 to be charged, so go round and begin again, form vibration.Duration of charging in its working cycle is T1=0.7 (R2+R3) C1; Be T2=0.7R3*C1 discharge time; Output pulse duty factor is q=(R2+R3)/(R2+2R3), in order to make to export pulse duty factor, approaches 50%, R2 and should be far smaller than R3.When extraneous humidity changes, HS1101 two ends capacitance changes, thereby changes the output frequency of timing circuit.As long as therefore measure 555 output frequency, and according to the relation of humidity and output frequency, can try to achieve the humidity of environment.
For NO and NO
2detection, also can adopt corresponding gas sensor to detect, but because NO and NO2 gas sensor are import mostly, expensive, and ozone sensor MQ131 is to NO, NO
2also have certain susceptibility (being only second to ozone and chlorine), thus this on-line measuring device only with MQ131, detect, due to O
3, NO, NO
2these three kinds of gases can reflect insulation defect, and it is rational selecting MQ131 to detect these three kinds of gases.In order to improve the impact of environmental factor, adopt four points to survey, 4 MQ131 are evenly distributed in testing environment.
Implementation step:
Described the first gas sensor, the second gas sensor, the 3rd gas sensor detect the air in generator wind-tunnel, Real-time Collection O
3, NO and NO
2the concentration of these three kinds of gases, through signals collecting/processing module, convert to and can be passed to terrain processing module for the voltage signal of A/D acquisition module identification, terrain processing module is delivered to LCDs and host computer after data are processed, LCDs shows in real time to measured value, and host computer is stored data.Terrain processing module can be used single-chip microcomputer, and terrain processing module is to O
3, NO and NO
2the degree of correlation of the concentration of these three kinds of gases, the variation tendency of concentration, gas concentration and stator insulation is analyzed, and after calculated value reaches threshold value, by warning device, sends alerting signal, and warning device can adopt: LED, hummer etc.Prompting operations staff carries out testing in depth testing to equipment, maintenance.
Claims (6)
1. the generator stator bar Insulation Live Testing device detecting based on gas, comprising: for detection of O
3the first gas sensor of concentration, for detection of the second gas sensor of NO concentration, for detection of NO
2the 3rd gas sensor of concentration, is characterized in that, described the first gas sensor, the second gas sensor, the 3rd gas sensor are arranged in generator wind-tunnel; Described the first gas sensor, the second gas sensor, the 3rd gas sensor connect respectively signals collecting/processing module, and signals collecting/processing module connects terrain processing module, and terrain processing module connects host computer, warning device and LCDs.
2. the generator stator bar Insulation Live Testing device detecting based on gas according to claim 1, is characterized in that, described the first gas sensor, the second gas sensor, the 3rd gas sensor are: ozone sensor MQ131.
3. the generator stator bar Insulation Live Testing device detecting based on gas according to claim 1, is characterized in that, described signals collecting/processing module by: signal processing module and A/D acquisition module connect and compose.
4. according to the generator stator bar Insulation Live Testing device detecting based on gas described in claim 1 or 3, it is characterized in that, described signals collecting/processing module connects temperature sensor, humidity sensor.
5. the generator stator bar Insulation Live Testing device detecting based on gas according to claim 1, is characterized in that, described terrain processing module connects host computer by RS-232 serial bus.
6. according to the generator stator bar Insulation Live Testing device detecting based on gas described in claim 1 or 5, it is characterized in that, described terrain processing module is single chip processing module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320716618.9U CN203759183U (en) | 2013-11-13 | 2013-11-13 | Generator stator bar insulation online detection device based on gas detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320716618.9U CN203759183U (en) | 2013-11-13 | 2013-11-13 | Generator stator bar insulation online detection device based on gas detection |
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| Publication Number | Publication Date |
|---|---|
| CN203759183U true CN203759183U (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320716618.9U Expired - Fee Related CN203759183U (en) | 2013-11-13 | 2013-11-13 | Generator stator bar insulation online detection device based on gas detection |
Country Status (1)
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|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592583A (en) * | 2013-11-13 | 2014-02-19 | 三峡大学 | Generator stator bar insulation online detection device based on gas detection |
| CN112285558A (en) * | 2020-10-23 | 2021-01-29 | 上海电气风电集团股份有限公司 | Insulation fault discharge test device and method for wind driven generator winding |
-
2013
- 2013-11-13 CN CN201320716618.9U patent/CN203759183U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592583A (en) * | 2013-11-13 | 2014-02-19 | 三峡大学 | Generator stator bar insulation online detection device based on gas detection |
| CN112285558A (en) * | 2020-10-23 | 2021-01-29 | 上海电气风电集团股份有限公司 | Insulation fault discharge test device and method for wind driven generator winding |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20151113 |
|
| EXPY | Termination of patent right or utility model |