CN104297649A - Heat ageing test device and method of generator stator coil bar - Google Patents
Heat ageing test device and method of generator stator coil bar Download PDFInfo
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- CN104297649A CN104297649A CN201410563337.3A CN201410563337A CN104297649A CN 104297649 A CN104297649 A CN 104297649A CN 201410563337 A CN201410563337 A CN 201410563337A CN 104297649 A CN104297649 A CN 104297649A
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- heating
- heating plate
- test device
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- line rod
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Abstract
The invention discloses a heat ageing test device and method of a generator stator coil bar. The test device is composed of an adjustable moving support provided with a control box and a heating portion arranged on the moving support, wherein the heating portion comprises a plurality of bottom heating plates and a plurality of top heating plates. The bottom heating plates and the top heating plates are mutually connected through symmetrical longitudinal wall boards on two horizontal sides to form a longitudinal through cavity, and positioning trough plates for fixing coil bar samples are arranged at two ends of the through cavity. Electrical heating elements are arranged in the heating plates and are electrically connected with a control output of the control box through wiring pins at one end or two ends of each electrical heating element. By means of the heat ageing test device, a high-temperature and low-temperature hot and cold cycle test can be simultaneously conducted on a plurality of narrow pumped storage motor stator coil bars with wide cross sections, and an electric heating long-tem ageing test can be also performed.
Description
Technical field
The present invention relates to a kind of technology being examined (comprising energising) conductor insulation level by periodically-varied temperature, the proving installation of a kind of large generator stator bar dielectric level particularly in hydroenergy storage station and method.
Background technology
Hydroenergy storage station be there is peak regulation, fill out paddy, the particular power source of the multiple effect such as frequency modulation, phase modulation and emergency duty, have flexible operation and react feature efficiently, to guaranteeing power system security, stable and economical operation has vital role.But the motor essence in this power station is exactly the hydrogenerator not only can made water pump power but also can be used to generate electricity, and the stator bar of motor is then its heart.When generator is switched to generator operation state from water pump operation state, is switched to water pump operation state again, constantly repeatedly switch circulation, the temperature height change of generator stator bar can be caused, the cracking between stator bar copper conductor surface and insulation course or insulation course inside is caused to produce defect, when the electric heating that electric current produces acts on simultaneously, the development of these defects will be accelerated, finally cause stator bar to be destroyed.Therefore, examination pumped-storage power generation machine stator line rod bears the ability of high/low temperature cold cycling, and the ability of tolerance thermal-electrical aging, has important practical significance.In order to study the impact of thermal field on stator bar insulation ag(e)ing better, current thermal aging test generally adopts large-scale baking oven to carry out thermal aging test to the running environment simulating prototype line rod to stator bar.But for high-rating generator, its stator bar joint length is greater than 3 meters usually, and multi-size, to carry out thermal aging test to it in an oven, then need to block destruction to line rod, its shortcoming one is that dry run environment is untrue; Two is experimentation cost too high (the line rod after blocking can not be used again), wastes a large amount of manpower financial capacity; Three is that oven interior temperature field is uneven, thermograde difference is greater than ± and 5 DEG C, affect the reliability of ageing results assessment.In addition, adopt the thermal aging test of baking oven, can not implement at the scene, test wire rod can only be transported to place, baking oven place, thus increase the cost of test further.
Summary of the invention
The object of this invention is to provide and a kind ofly can at the on-the-spot test unit stator bar of high-rating generator being carried out to cold and hot aging and thermal aging of hydroenergy storage station, and utilize this device better to simulate the test method of this generator stator bar actual motion state.
In order to reach above object, the present invention takes following technical scheme to be achieved:
A kind of thermal aging test device of generator stator bar, be made up of with the heating part be arranged on this traversing carriage the adjustable traversing carriage with control box, it is characterized in that, described heating part comprises the end heating plate and top heating plate that polylith is longitudinally arranged side by side, this polylith top heating plate, at the bottom of this polylith, heating plate is parallel up and down, and be interconnected by longitudinal wallboard of both lateral sides symmetry, form longitudinal cavity, at the two ends of this longitudinal cavity, positioning groove plate is set, uniform multiple groove just matched with line rod sample section shape on it, in order to locate tested stator bar, described longitudinal wallboard is provided with multiple thermometer hole, each thermometer hole is installed with a temperature sensor, sensor is affixed on the line rod surface at heat tunnel place, one group of heat tunnel that the end heating plate just corresponding to a top heating plate and perpendicular direction is formed, described top heating plate and end heating plate make standard rectangular plate by the aluminum alloy materials that thermal conductivity is good, its inside is provided with electrical heating elements, is electrically connected by exporting with the control of control box through the wiring pin of one or both ends of rectangular slab.
In such scheme, after tested stator bar is located, described positioning groove plate add baffled, by described longitudinal cavity base closed.
Longitudinal wallboard below described thermometer hole is arranged the batten that longitudinally insulate, which is provided with some binding posts, each binding post connects the wiring pin of the electrical heating elements in often pair of heating plate by wire.
Described top or end heating plate comprise the body involuted by measure-alike medial and lateral concave-board, wherein outer concave frid inwall posts heat-preservation cotton as thermofin, inboard groove plate inwall posts mica as insulation course, accompany heating graphite sheet between heat-preservation cotton and mica as conductive heating layer, its two ends are electrically connected with wiring pin.
A thermal aging test method for generator stator bar, adopts aforementioned hot ageing test apparatus to realize, comprises the steps:
(1) in the middle part of test wire rod, the part of brushing low-resistance paint is wound around aluminium foil as ground-electrode, and aluminium foil periphery glass tape is tightened;
(2) by each groove of many line rod samples difference insertion apparatus longitudinal cavity one end positioning groove plates, and stretched out by the groove of longitudinal cavity from the corresponding positioning groove plate of the other end, make longitudinal cavity district surround the ground-electrode part of line rod sample;
(3) by the ground-electrode series connection of each line rod sample, and be connected with ground wire; Each line rod sample one end exposed copper core segment silver-plated copper wire connects as high voltage input end, and the other end does not process;
(4) temperature sensor is all installed with at each thermometer hole of longitudinal wallboard, one group of heat tunnel that the end heating plate corresponding respectively to a top heating plate and perpendicular direction is formed; The wiring pin of each group of heat tunnel top, end heating plate is exported with the control of control box and is electrically connected, control box is by the data of each heat tunnel temperature sensor feedback of contrast, the heating power of each heat tunnel top of combine regulation, end heating plate, making the uniform temperature fields of whole longitudinal cavity, temperature gradient error is less than ± and 2 DEG C;
(5) each line rod sample high voltage incoming end connects the adjustable ac high-voltage source of 50kV, arranges different access voltage by line rod size of sample;
(6) " constant temperature " pattern or " temperature cycles control " pattern two kinds of thermal aging tests of line rod sample are completed by " single/circulation " switch in control box.
In said method, when more than 1.5m is longer than by test wire rod, heating part series connection is used by web joint by 2 and above thermal aging test device.
Compare existing thermal aging test device and the problem existing for side: 1. test wire rod local ageing temperature is uncontrollable, and environment temperature is uneven, and the heating field that hot blast is formed differs larger with prototype line rod actual motion environment; 2. seldom consider the impact of voltage, have certain influence to experimental result.The advantage of the thermal aging test device and method of the generator stator bar that the present invention proposes is:
1, can simulate the running environment of prototype line rod more really, experimental result has more researching value.
2, high/low temperature thermal cycling test can be carried out to the many wide pump storage machines stator bars narrow again in cross section simultaneously, also electric heating long-term aging test can be carried out, examination pump storage machines stator bar bears the ability of high/low temperature cold cycling, and the ability of tolerance thermal-electrical aging.
Accompanying drawing explanation
Below in conjunction with the drawings and the specific embodiments, the present invention is described in further detail.
Fig. 1 is the stereographic map of apparatus of the present invention structure.
Fig. 2 is the cut-away view of lower heating plate in Fig. 1.
Fig. 3 is the using state figure (to situation about testing in the middle part of it after the installation of stator bar sample) of Fig. 1 device.
Fig. 4 is the using state figure (testing whole stator bar sample) after combining with two Fig. 1 devices.
In Fig. 1 ~ Fig. 4: 1, groove; 2, line rod positioning groove plate; 3, baffle plate; 4, heating plate is pushed up; 5, longitudinal wallboard; 6, binding post; 7, insulate batten; 8, end heating plate; 9, wiring pin; 10, upper bracket; 11, screw is held out against; 12, control box; 13, lower carriage; 14, thermometer hole; 15, heating plate body; 16, mica; 17, heating graphite sheet; 18, heat-preservation cotton; 20, line rod sample; 21, web joint.
Embodiment
With reference to figure 1, a kind of thermal aging test device of generator stator bar, by heating part, control box (manually with temperature automatically controlled), adjustable traversing carriage three part.Wherein, adjustable traversing carriage is made up of upper bracket 10 and the bottom lower carriage 13 with universal wheel, lower carriage is equipped with control box 12, can carries out temperature automatic control to the electric hot plate in heating part.Enclose frame above upper bracket and connect heating part by insulcrete (not shown in FIG.), four four respective straight that directly support is connected to lower carriage by expansion link of upper bracket support, conveniently adjusted whole support height, after regulating height, fixes by holding out against screw 11.
Heating part comprises polylith longitudinally (left and right directions in Fig. 1) end heating plate 8 of being arranged side by side and top heating plate 4, this polylith (in figure 5 pieces) top heating plate, this polylith (in figure 5 pieces) end heating plate are parallel up and down, and be interconnected by longitudinal wallboard 5 of both lateral sides symmetry, form longitudinal cavity, line rod positioning groove plate 2 is set at the two ends of this longitudinal cavity, the groove 1 that on it, uniform multiple (in figure 5) just match with line rod sample section shape, in order to locate tested stator bar.In order to prevent heat to run off from longitudinal cavity two ends, this device also arranges baffle plate 3 on positioning groove plate 2, thus is substantially closed by longitudinal cavity in online excellent sample aging sample.Longitudinal wallboard 5 is provided with multiple (in figure 5) thermometer hole 14, each thermometer hole is installed with a temperature sensor, one group of heat tunnel that the end heating plate 8 just corresponding to a top heating plate 4 and perpendicular direction is formed, in order to record the temperature of this rod of top-stitching to heating plate specimen surface.At the arranged beneath longitudinally insulation batten 7 of longitudinal wallboard 5 thermometer hole 14, which is provided with some binding posts 6 (in figure 5), energising in order to the electrical heating elements in often pair of heating plate (top, the end) connects, heating element in Fig. 1 heating plate can adopt plate graphite resistance heater, two wiring pin 9 is located at heating plate side respectively, and by wire nearby binding post 6 connect, binding post exports with the control of control box and is electrically connected.
Amount to five groups of heat tunnels in longitudinal cavity, controlled by the temp controlled meter of five on control box 12 respectively, the output power of each passage can be set in the optimum configurations of temp controlled meter.By contrasting the data of temperature sensor feedback between each pair of heating plate, regulating the heating power of these five groups of heat tunnels, making the uniform temperature fields in whole longitudinal cavity, temperature gradient error is less than ± and 2 DEG C.
Control box is provided with the switch (single/circulation) that can be used to change apparatus of the present invention heating mode, temperature retention time and temperature fall time can be set respectively when circulating-heating pattern, when five temp controlled meters all reach respective design temperature, be judged as that intensification completes and starts to be incubated timing through the single-chip microcomputer that control box is built-in, the power supply of five groups of heat tunnels is cut off after reaching the temperature retention time of setting, when starting frigorimeter simultaneously, enter next circulation after reaching the temperature fall time of setting and start to heat up.When single heating mode insulation timing identical with circulation experiment, at this moment lower the temperature timer as cumulative timer use, can digestion time be set, time of day can by setting parameter be second, divide, time, sky, 9999 days can be added up at most.After setting-up time, automatic cut-off power completes experiment.
With reference to figure 2, top in Fig. 1 heating part or end heating plate 4 or 8, the aluminum alloy growth 640mm good by thermal conductivity, wide 200mm, the rectangular slab of thickness 20mm, to push up heating plate 4, comprise by measure-alike, the body 15 that outer concave frid involutes, wherein outer concave frid (the fovea superior frid in Fig. 2, the side of phase lineback rod sample) inwall posts heat-preservation cotton 18 as thermofin, inboard groove plate (the recessed frid in Fig. 2, the side of relative line rod sample) inwall posts mica 16 as insulation course, heating graphite sheet 17 is accompanied as conductive heating layer between heat-preservation cotton and mica, its two ends are electrically connected with wiring pin 9, by in the aluminium matter of heating graphite sheet and high heat conduction, outer concave-board makes temperature of heating plate even.This specially designed heating plate of the present invention heat after tested evenly, structure is more firm, and the life-span is more of a specified duration.Long-term thermal-electrical aging (being greater than 5000 hours) can be carried out to test wire rod.
With reference to figure 3, by the heat ageing platform of the structure of Fig. 1 as a test unit, this unit can to long 1500mm, and five line rods of wide 100mm carry out thermal aging test simultaneously.If test wire rod is shorter than above sample, the heat tunnel can closing respective numbers in this test unit heating part carries out heat ageing to reasonable region.
With reference to figure 4, if more than 1.5m sample is longer than by test wire rod, heating part series connection can be used by web joint 21 by the test unit of 2 and above Fig. 1.
Adopt following thermal aging test method
Specifically comprise the steps:
(1) in the middle part of test wire rod 20, the part of brushing low-resistance paint is wound around aluminium foil as ground-electrode, and aluminium foil periphery glass tape is tightened, and to reduce the air of internal residual, reduces the impact of air disruptive discharge in experimentation.
(2) by 5 grooves 1 of 5 line rod samples 20 difference insertion apparatus longitudinal cavity one end positioning groove plates 2, and stretched out from the groove 1 of the corresponding positioning groove plate 2 of the other end by longitudinal cavity (heating zone), make heating zone surround the ground-electrode part of line rod sample, 5 line rod samples can be positioned in the corresponding recesses at two ends.By the ground-electrode series connection of each line rod sample, and be connected with ground wire.Introduce at least 5 temperature sensors by 5 thermometer holes on longitudinal wallboard, be evenly distributed in the regional of heating zone line rod sample, sensor is affixed on the line rod surface at heat tunnel place, with the homogeneity of monitor temperature field.Each line rod sample one end exposed copper core segment silver-plated copper wire connects as high voltage input end, and the other end does not process.
(3) one group of heat tunnel forming of the end heating plate in each top heating plate and perpendicular direction, amount to five groups of heat tunnels and form longitudinal cavity, the wiring pin of Jiang Ding, end heating plate exports with the control of control box and is electrically connected, and is controlled respectively by group temperature controller of five in control box to the output power of each passage.By contrasting the data of each heat tunnel temperature sensor feedback, regulating the heating power of five groups of heat tunnels, making the uniform temperature fields that whole heating part exports, temperature error is less than ± and 2 DEG C.
(4) each line rod sample high voltage incoming end connects the adjustable ac high-voltage source of 50kV, can arrange different access voltage by line rod size of sample.
(5) control box is provided with " thermostatic control " and " temperature cycles control " two kinds of patterns.Under thermostatic control pattern, Heating Zone Temperature maintains a certain steady temperature (such as: 120 DEG C, 130 DEG C, 155 DEG C, 180 DEG C); Under temperature cycles control model, control box, according to the time set start/stop heat tunnel power supply repeatedly, realizes temperature cycles change.
Claims (6)
1. the thermal aging test device of a generator stator bar, be made up of with the heating part be arranged on this traversing carriage the adjustable traversing carriage with control box, it is characterized in that, described heating part comprises the end heating plate and top heating plate that polylith is longitudinally arranged side by side, this polylith top heating plate, at the bottom of this polylith, heating plate is parallel up and down, and be interconnected by longitudinal wallboard of both lateral sides symmetry, form longitudinal cavity, at the two ends of this longitudinal cavity, positioning groove plate is set, uniform multiple groove just matched with line rod sample section shape on it, in order to locate tested stator bar, described longitudinal wallboard is provided with multiple thermometer hole, each thermometer hole is installed with a temperature sensor, one group of heat tunnel that the end heating plate just corresponding to a top heating plate and perpendicular direction is formed, described top heating plate and end heating plate make standard rectangular plate by the aluminum alloy materials that thermal conductivity is good, its inside is provided with electrical heating elements, is electrically connected by exporting with the control of control box through the wiring pin of one or both ends of rectangular slab.
2. the thermal aging test device of generator stator bar as claimed in claim 1, is characterized in that, after tested stator bar is located, described positioning groove plate adds baffled, by described longitudinal cavity base closed.
3. the thermal aging test device of generator stator bar as claimed in claim 1, it is characterized in that, longitudinal wallboard below described thermometer hole is arranged the batten that longitudinally insulate, which is provided with some binding posts, each binding post connects the wiring pin of the electrical heating elements in often pair of heating plate by wire.
4. the thermal aging test device of generator stator bar as claimed in claim 1, it is characterized in that, described top or end heating plate comprise the body involuted by measure-alike medial and lateral concave-board, wherein outer concave frid inwall posts heat-preservation cotton as thermofin, inboard groove plate inwall posts mica as insulation course, accompany heating graphite sheet between heat-preservation cotton and mica as conductive heating layer, its two ends are electrically connected with wiring pin.
5. the thermal aging test device of generator stator bar as claimed in claim 1, is characterized in that, when more than 1.5m is longer than by test wire rod, 2 and above thermal aging test device heating part series connection is used by web joint.
6. a thermal aging test method for generator stator bar, is characterized in that, adopts the thermal aging test device of generator stator bar described in claim 1 to realize, comprises the steps:
(1) in the middle part of test wire rod, the part of brushing low-resistance paint is wound around aluminium foil as ground-electrode, and aluminium foil periphery glass tape is tightened;
(2) by each groove of many line rod samples difference insertion apparatus longitudinal cavity one end positioning groove plates, and stretched out by the groove of longitudinal cavity from the corresponding positioning groove plate of the other end, make longitudinal cavity district surround the ground-electrode part of line rod sample;
(3) by the ground-electrode series connection of each line rod sample, and be connected with ground wire; Each line rod sample one end exposed copper core segment silver-plated copper wire connects as high voltage input end, and the other end does not process;
(4) temperature sensor is all installed with at each thermometer hole of longitudinal wallboard, one group of heat tunnel that the end heating plate corresponding respectively to a top heating plate and perpendicular direction is formed; The wiring pin of each group of heat tunnel top, end heating plate is exported with the control of control box and is electrically connected, control box is by the data of each heat tunnel temperature sensor feedback of contrast, the heating power of each heat tunnel top of combine regulation, end heating plate, making the uniform temperature fields of whole longitudinal cavity, temperature gradient error is less than ± and 2 DEG C;
(5) each line rod sample high voltage incoming end connects the adjustable ac high-voltage source of 50kV, arranges different access voltage by line rod size of sample;
(6) " constant temperature " pattern or " temperature cycles " pattern two kinds of thermal aging tests of line rod sample are completed by " single/circulation " switch in control box.
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| CN201410563337.3A CN104297649A (en) | 2014-10-20 | 2014-10-20 | Heat ageing test device and method of generator stator coil bar |
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Cited By (5)
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| CN104697571A (en) * | 2015-03-23 | 2015-06-10 | 中国南方电网有限责任公司调峰调频发电公司 | Generator stator bar copper core and external insulator shell removal loosing measuring method |
| CN105021989A (en) * | 2015-07-20 | 2015-11-04 | 哈尔滨理工大学 | Generator stator bar inter-strand circulation loss testing system and measuring method realized by using system |
| CN105928780A (en) * | 2016-05-12 | 2016-09-07 | 哈尔滨理工大学 | Testing clamp for model winding bar used for studying reactor turn-to-turn insulation vibrating and aging |
| CN107167732A (en) * | 2017-06-20 | 2017-09-15 | 北京奥博汽车电子电器有限公司 | Automobile generator efficiency automatic testing equipment |
| CN107664652A (en) * | 2017-08-01 | 2018-02-06 | 哈尔滨哈普电气技术有限责任公司 | A kind of dynamic aging tester device and method of work |
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| CN107664652A (en) * | 2017-08-01 | 2018-02-06 | 哈尔滨哈普电气技术有限责任公司 | A kind of dynamic aging tester device and method of work |
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Application publication date: 20150121 |