CN208091690U - Utilize the generator unit stator winding hot water stream experimental rig of fiber grating sensing technology - Google Patents
Utilize the generator unit stator winding hot water stream experimental rig of fiber grating sensing technology Download PDFInfo
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- CN208091690U CN208091690U CN201820617487.1U CN201820617487U CN208091690U CN 208091690 U CN208091690 U CN 208091690U CN 201820617487 U CN201820617487 U CN 201820617487U CN 208091690 U CN208091690 U CN 208091690U
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Abstract
The utility model discloses a kind of generator unit stator winding hot water stream experimental rigs using fiber grating sensing technology, including fiber-optical grating temperature sensor, fiber grating host, analyzer, the fiber-optical grating temperature sensor is mounted on insulating water inlet pipe, fiber-optical grating temperature sensor is connected by optical fiber with fiber grating host, fiber grating host is connected to analyzer, every optical fiber connects at least one fiber-optical grating temperature sensor, and the grating of multiple and different Bragg wavelengths is inscribed on every optical fiber.The utility model has the following advantages compared with prior art：The device uses fiber grating sensing technology, directly hot water stream test data directly can not in real time be acquired using DCS system, and can independently to collected data carry out analyzing processing, it can be achieved that accurate detection to generator unit stator winding water system circulation situation.
Description
Technical field
The invention belongs to electric equipment test detection fields, specifically, are related to a kind of generator unit stator winding water system
The detection device of circulation.
Background technology
Large turbo-type generator mostly uses the type of cooling of water-hydrogen-hydrogen at present：That is generator unit stator winding internal water cooling,
Rotor windings internal hydrogen cooling, the cooling of stator core hydrogen surface-type.Under operation, mechanical energy is changed into electric energy by generator
Simultaneously as having electric current to flow through in rotor and stator coil and generating copper loss, stator core and its side end structural member are in alternation magnetic
Iron loss is generated under field action, rotor is with stator surface because cutting magnetic field locally generates eddy-current loss.In addition, cooling medium can also produce
Frictional dissipation etc. between raw frictional dissipation, bearing and oil film.These losses are showed in the form of heat, to avoid
Generator coil reduces dielectric strength because temperature increases, and even causes insulation damages, it is necessary to which the cooling that generator is arranged is set
Heat standby, that discharge is generated by loss in time, to ensure generator normal operation at the allowed temperature.Motor stator cooling water system
System is for cooled electric generator stator winding and the bushing of outgoing line side.The system is closed circulation system.Its water quality is generally
Demineralized water comes from chemical feed water system.Before entering generator closed-type circulating cooling water system, cooling water elder generation deionization dress
Carry out ion exchange is set, is then stored at stator cooling water case, then injection stator winding is pumped by stator cooling water.Usual stator is cold
But the temperature of water water inlet is within the scope of 35~46 DEG C.Its main function is：To ensure to supply water incessantly to stator coil, make
Stator coil temperature is kept within the allowable range.
Since the electric current that generator stator bar flows through is larger, calorific value is considerable, once have because of copper corrosion or
Foreign matter enters generator cooling-water circuit and causes to block, and water- cooling generator can stop flowing when serious, cooling water office in several minutes
Portion's temperature will reach boiling point vaporization, and to generate gas stifled, and loud catastrophe failure in a few minutes, such as bar scaling loss, burn melt, blow,
Insulation breakdown etc., damage generator cause chaser failure.As it can be seen that being very heavy to the inspection of generator stator cooling water system circulation
It wants.
At present in power industry, tested for large turbo-type generator stator winding water system circulation, main side
Method has following two：
(1) ultrasound water flow method
Ultrasonic wave water flow method is that the outside of insulating water inlet pipe to be measured is clipped in using ultrasonic sensor, is surveyed using sensor
Measure flow rate of liquid in insulating water inlet pipe.According to signal detection principle, it is inclined that supercritical ultrasonics technology can be divided into propagation speed differential method, wave beam
Shifting method, Doppler method etc., home products technology mainly use time difference method.Time difference method is measured using two sensors, each
Sensor has the function of reception and transmitting.Two sensors are respectively upstream sensor and downstream sensor, are sent out from sensor
The ping penetrated is propagated by tube wall and liquid between two sensors, flow rate effect of the propagation time by liquid.From upper
The acoustic velocity that trip sensor is sent to downstream sensor accelerates since liquid flows, and is passed on the contrary, being sent to upstream from downstream sensor
The acoustic velocity of sensor is slowed down since liquid flows.The net time difference in upstream and downstream propagation time is directly and liquid flow velocity
It is directly proportional.Time difference method requires caliber more straight.
Supersonic testing method does not contact fluid to be measured, as long as stator winding water-cooling system reaches hair without dismantling tested pipeline
Normal pressure and flow when motor normal operation can be tested, and can truly reflect the operation shape of water-cooling system
Condition does not influence maintenance duration.But there is also following disadvantages：(1) test point both sides should retain corresponding straight pipe, test point upstream
Straight pipe need to be more than 10D (D is tested pipeline diameter), and downstream need to be more than 5D, while avoid pump, valve and throttle orifice.Live item
Part tends not to the straight tube distance for meeting test request, should repeatedly measure, and takes metastable average value；(2) it is needed when testing
Subject to the pressure of cooling water system normal operating condition, flow, and water quality is qualified, does not contain a large amount of bubbles；(3) stator winding is cold
But water pipe diameter is typically small, and when measuring, fixture is difficult to fix；(4) ensure when testing nearby without strong electromagnetic and vibration,
Such as radio, electric welding, big flow automobile or electric car.(5) it is difficult to realize measure in the case where not taking out rotor condition.
(2) conventional hot water flows method
Generator thermal water flow test is to examine generator unit stator winding internal watercourses with the presence or absence of a kind of experiment side blocked
Method.Experiment heats generator stator cooling water case by self-loopa or other householder methods first, will determine cooling water inlet or outlet temperature
It is heated to being more than to determine cold water cooling water temperature 10K-15K or more, cold water exits and entrances valve, start recording temperature are determined in closing.10 points
Zhong Hou, input determine chilled water cooler and start stator cooling water pump, when stator winding inner water system being made to keep normal operation
Pressure difference, while temperature reading is recorded, later every temperature reading of 1min cycle index, until at a temperature of stator cooling water
It is down to and determines cold water cooling water temperature and approach, off-test.By observe more each insulating water inlet pipe temperature-time graph come
Judge whether insulating water inlet pipe generates blocking.Common insulating water inlet pipe temperature-time graph is as shown in Figure 1, wherein the left side is
The figure of flow under normal circumstances, the right are the figure for having water blocking phenomenon.
Hot water flow, which measures generator stator cooling water system circulation, that test method is simple, and test result is intuitive accurate etc. excellent
Point, and can still carry out in the case where not taking out rotor condition.But there is also following problems：(1) domestic hot water stream experiment makes at present
Thermometric is carried out with the temperature sensor of the pre-buried biography of generator, initial temperature differences are larger (more than 5 between usually there is each temperature point
DEG C) the problem of, and once there is thermometric bad point in generator pre-buried sensor, then corresponding bar can not detect inside stator winding
Flow general character situation；(2) current test data is obtained from Power Plant DCS System, copy procedure trouble, and plot analysis process
It is very complicated.
In conclusion former from detection for detecting generator unit stator winding water system circulation method in power industry at present
From the point of view of reason and practical application effect, have the shortcomings that on diagnostic accuracy and diagnostic test enforcement difficulty different degrees of and not
Foot there is no the ways and means that can be achieved accurately to be detected to generator unit stator winding water system circulation.
Utility model content
The technical problem to be solved by the utility model is to existing power generation generator unit stator is detected without reliable effective ways
The problem of winding water system circulation.
The utility model is to solve above-mentioned technical problem by the following technical programs：It is a kind of to utilize optical fiber grating sensing skill
The generator unit stator winding hot water stream experimental rig of art, including fiber-optical grating temperature sensor, fiber grating host, analyzer,
The fiber-optical grating temperature sensor is mounted on insulating water inlet pipe, and fiber-optical grating temperature sensor passes through optical fiber and fiber grating
Host is connected, and fiber grating host is connected to analyzer, and every optical fiber connects at least one fiber-optical grating temperature sensor, every light
The grating of multiple and different Bragg wavelengths is inscribed on fibre.
As the technical solution advanced optimized, fiber-optical grating temperature sensor is installed to insulation diversion in a manner of pasting
Guan Shang.
Alternatively, fiber-optical grating temperature sensor is installed in a manner of being clamped on insulating water inlet pipe.
Alternatively, fiber-optical grating temperature sensor is installed in a manner of bundling on insulating water inlet pipe.
Alternatively, fiber-optical grating temperature sensor is installed in a manner of being embedded on insulating water inlet pipe.
As the technical solution advanced optimized, a fiber-optical grating temperature sensor is installed on every insulating water inlet pipe.
As the technical solution advanced optimized, every every optical fiber is connected on a channel of fiber grating host.
As the technical solution advanced optimized, analyzer is computer.
As the technical solution advanced optimized, analyzer is handheld mobile device.
As the technical solution advanced optimized, the generator unit stator winding heat using fiber grating sensing technology
Water flow test device includes 42 fiber-optical grating temperature sensors, 3 optical fiber, and an optical fiber light is installed on every insulating water inlet pipe
Grid temperature sensor, 1 optical fiber connect 14 fiber-optical grating temperature sensors, and 3 optical fiber are connected respectively to fiber grating host
3 channels on.
The utility model has the following advantages compared with prior art：The device uses fiber grating sensing technology, can not
Directly hot water stream test data is directly acquired in real time using DCS system, and can independently to the collected data of institute into
Row analyzing processing is, it can be achieved that accurate detection to generator unit stator winding water system circulation situation.
Description of the drawings
Fig. 1 is insulating water inlet pipe temperature-time graph in background technology；
Fig. 2 is the survey of the generator unit stator winding hot water stream experimental rig using fiber grating sensing technology of the present embodiment
Try principle schematic.
Fig. 3 is three channels of setting, and temperature-time plot that 14 measuring points generate is arranged in each channel.
Specific implementation mode
It elaborates below to the embodiments of the present invention, the present embodiment before being with technical solutions of the utility model
It puts and is implemented, give detailed embodiment and specific operating process, but the scope of protection of the utility model is unlimited
In following embodiments.
As shown in Fig. 2, the generator unit stator winding hot water stream using fiber grating sensing technology of the present embodiment tests dress
It sets including fiber-optical grating temperature sensor, fiber grating host, analyzer.
Left side is generator unit stator water route schematic diagram in Fig. 2.It is encouraged with digital representation stator in generator unit stator water route part
Hold insulating water inlet pipe.The fiber-optical grating temperature sensor is mounted on insulating water inlet pipe, and fiber-optical grating temperature sensor passes through
Optical fiber is connected with fiber grating host, and fiber grating host is connected to analyzer, and analyzer is acquired analysis to the data obtained.
The parameter of the fiber-optical grating temperature sensor is as shown in table 1 below：
1 fiber-optical grating temperature sensor parameter of table
| Parameter type | Parameter value |
| Range (DEG C) | 0~100 |
| Resolution ratio (DEG C) | 0.1 |
| Raster center wavelength (nm) | 1510~1590 |
| Reflectivity (%) | ≥90 |
| Connection type | Welding or FC/APC grafting |
| Mounting means | It pastes, clamping, binding, be embedded to |
Wherein, fiber-optical grating temperature sensor can be pacified in a manner of pasting or being clamped or bundle or be embedded to
It is attached on insulating water inlet pipe.It can be to install a fiber-optical grating temperature sensor on every insulating water inlet pipe, it can also multiple light
Fine grating temperature sensor is mounted on an insulating water inlet pipe, or more of interval insulating water inlet pipe installs a fiber grating
Temperature sensor.
The grating for inscribing multiple and different Bragg wavelengths on the every optical fiber according to application requirement, may be implemented at one
It is collected simultaneously the multiple temperature informations of transmission on optical fiber, the quantity of signal transmssion line can be greatly reduced, experiment is facilitated to carry out.Often
Root optical fiber connects at least one fiber-optical grating temperature sensor, and three channels are such as arranged, and five measuring points are arranged in each channel, i.e., often
Root optical fiber connects five fiber-optical grating temperature sensors.In practical application, can be needed according to measurement select measuring point number and
Channel number, for example 16 channels also can be used, 25 measuring points can be at most arranged in each channel, be fully able to meet to diversion of insulating
The acquisition of pipe temperature information.
The parameter of the fiber grating host and analyzer see the table below shown in 2：
2 fiber grating host of table and analyzer parameter
Above-mentioned every optical fiber is connected on a channel of fiber grating host.
The analyzer is the computer with Data Analysis Software.The analyzer is the intelligence such as the mobile phone with Data Analysis Software
It can handheld terminal.
It is as described below using the specific detection process of the utility model：
1) experimental rig is got out, fiber-optic grating sensor is pasted onto according to number on generator insulating aqueduct.
2) start stator exterior water system, adjust stator into and out of the pressure difference between water-main to normal operating value, measure simultaneously
Record the temperature reading of each generator leaving water temperature measuring point at this time.
3) by self-loopa and be aided with heating electric generator inner cooling water tank, by test water heat at least over cold water temperature
15K or more.
4) when the temperature of all generator leaving water temperature measuring points is close, stop the operation of stator exterior water system, and close
Fall ancillary heating equipment while recording each point temperature reading.
5) stator cooling water pump shutdown state 10min is kept.
6) after stoppage in transit state, cooling water valve is quickly opened, stator interior cooling water system is allowed to pass to cooling water simultaneously
It will determine chilled water cooler to open to the maximum.Pressure difference when starting water pump and stator interior water system being made to keep normal operation, reads simultaneously
Temperature reading is taken, and starts to draw temperature-time curve figure, until temperature tends towards stability.
7) in the data transmission to analyzer obtained, in analyzer be equipped with independent research Data Analysis Software, can and
When quickly the collected data of institute are analyzed, are stored, and temperature-time graph can be automatically generated, testing crew can be with
Temperature-time-tendency graph is observed by display, when three channels are arranged, 14 measuring points, the temperature of generation is arranged in each channel
Degree-time graph is as shown in Figure 3.
The cardinal principle of this method is for temperature acquisition inaccuracy and data collection process in traditional hot water stream method
Troublesome disadvantage is measured in real time the temperature of generator insulating aqueduct using fiber grating sensing technology, instead of it
It is preceding that the mode of thermometric is carried out by using the pre-buried temperature sensor of generator, and the data transmitted are handled, intuitively
Ground obtains to embody the test result of generator stator cooling water system circulation.
The basic principle of optical fiber and grating sensing temperature detection system is:When leading to optical fiber light on capacitance due to a variety of different factors
When grid temperature, deformation change, screen periods or fiber core refractive index will be caused to generate variation, to generate grating cloth loudspeaker lattice
The wavelength shift Δ λ of signal, by the situation of change for monitoring Bragg wavelength, you can obtain fiber grating week on insulating water inlet pipe
Enclose the changing condition of temperature.
Compared to traditional temperature sensor, fiber-optic grating sensor has high certainty of measurement, and real-time is good, anti-electromagnetism is dry
It disturbs, electrical insulation capability is good, corrosion-resistant, stable chemical performance, small, light-weight, geometry is plastic, transmission loss is small, passes
The advantages that defeated capacity is big, wide range of measurement；Also it is easy by the signal interference of environment, not corrosion resistant without thermocouple temperature sensor
The problems such as losing and wearing and environment temperature need to be compensated disadvantage.
In generator thermal water flow test, due to needing detected temperature point very much, passed according to traditional temperature
Sensor, as soon as the temperature information of each temperature point is required for a signal wire, this needs to arrange up to tens signal wires, right
In the space of this kind of relative closure of generator stator end, it is difficult to carry out to be, is even more nothing in the case where generator does not take out rotor condition
Method is carried out.In order to solve the problems, such as signal transmssion line excessively bad arrangement, signal is effectively reduced while ensureing measurement accuracy
Line number amount is special to have used fiber-optic grating sensor to facilitate arrangement, using the method for distributed sensor, i.e., the basis on an optical fiber
Application requirement inscribes the grating of multiple and different Bragg wavelengths, may be implemented to be collected simultaneously the multiple temperature of transmission on an optical fiber
Information can greatly reduce the quantity of signal transmssion line, and experiment is facilitated to carry out, and a current optical fiber can at most transmit 25
A temperature data, that is, transmission line quantity can be reduced to original people 1/25.
This method is measured using fiber-optical grating temperature sensor by making sensor be connected with generator insulating aqueduct
The temperature changing trend of insulating water inlet pipe, and sent data in analyzer by fiber grating host, to testing number
It is analyzed according to being acquired.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (10)
1. a kind of generator unit stator winding hot water stream experimental rig using fiber grating sensing technology, which is characterized in that including
Fiber-optical grating temperature sensor, fiber grating host, analyzer, the fiber-optical grating temperature sensor are mounted on insulating water inlet pipe
On, fiber-optical grating temperature sensor is connected by optical fiber with fiber grating host, and fiber grating host is connected to analyzer, every light
Fibre connects at least one fiber-optical grating temperature sensor, and the grating of multiple and different Bragg wavelengths is inscribed on every optical fiber.
2. the generator unit stator winding hot water stream experimental rig according to claim 1 using fiber grating sensing technology,
It is characterized in that, fiber-optical grating temperature sensor is installed in a manner of pasting on insulating water inlet pipe.
3. the generator unit stator winding hot water stream experimental rig according to claim 1 using fiber grating sensing technology,
It is characterized in that, fiber-optical grating temperature sensor is installed in a manner of being clamped on insulating water inlet pipe.
4. the generator unit stator winding hot water stream experimental rig according to claim 1 using fiber grating sensing technology,
It is characterized in that, fiber-optical grating temperature sensor is installed in a manner of bundling on insulating water inlet pipe.
5. the generator unit stator winding hot water stream experimental rig according to claim 1 using fiber grating sensing technology,
It is characterized in that, fiber-optical grating temperature sensor is installed in a manner of being embedded on insulating water inlet pipe.
6. the generator unit stator winding hot water stream experimental rig according to claim 1 using fiber grating sensing technology,
It is characterized in that, installing a fiber-optical grating temperature sensor on every insulating water inlet pipe.
7. the generator unit stator winding hot water stream experimental rig according to claim 1 using fiber grating sensing technology,
It is characterized in that, every optical fiber is connected on a channel of fiber grating host.
8. the generator unit stator winding hot water stream experimental rig according to claim 1 using fiber grating sensing technology,
It is characterized in that, analyzer is computer.
9. the generator unit stator winding hot water stream experimental rig according to claim 1 using fiber grating sensing technology,
It is characterized in that, analyzer is handheld mobile device.
10. the generator unit stator winding hot water stream experimental rig according to claim 1 using fiber grating sensing technology,
It is characterised in that it includes 42 fiber-optical grating temperature sensors, 3 optical fiber, an optical fiber light is installed on every insulating water inlet pipe
Grid temperature sensor, 1 optical fiber connect 14 fiber-optical grating temperature sensors, and 3 optical fiber are connected respectively to fiber grating host
3 channels on.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820617487.1U CN208091690U (en) | 2018-04-27 | 2018-04-27 | Utilize the generator unit stator winding hot water stream experimental rig of fiber grating sensing technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820617487.1U CN208091690U (en) | 2018-04-27 | 2018-04-27 | Utilize the generator unit stator winding hot water stream experimental rig of fiber grating sensing technology |
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| CN208091690U true CN208091690U (en) | 2018-11-13 |
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| CN201820617487.1U Active CN208091690U (en) | 2018-04-27 | 2018-04-27 | Utilize the generator unit stator winding hot water stream experimental rig of fiber grating sensing technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199505A (en) * | 2021-11-29 | 2022-03-18 | 中电华创(苏州)电力技术研究有限公司 | Generator stator bar circulation evaluation method based on correlation analysis |
-
2018
- 2018-04-27 CN CN201820617487.1U patent/CN208091690U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199505A (en) * | 2021-11-29 | 2022-03-18 | 中电华创(苏州)电力技术研究有限公司 | Generator stator bar circulation evaluation method based on correlation analysis |
| CN114199505B (en) * | 2021-11-29 | 2024-04-09 | 中电华创(苏州)电力技术研究有限公司 | Generator stator bar flow performance evaluation method based on correlation analysis |
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