CN111856271A - Insulation fault detection method for stator core of hydraulic generator - Google Patents
Insulation fault detection method for stator core of hydraulic generator Download PDFInfo
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- CN111856271A CN111856271A CN202010480818.3A CN202010480818A CN111856271A CN 111856271 A CN111856271 A CN 111856271A CN 202010480818 A CN202010480818 A CN 202010480818A CN 111856271 A CN111856271 A CN 111856271A
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- 238000009413 insulation Methods 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 title claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 117
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000012423 maintenance Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000011282 treatment Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000003475 lamination Methods 0.000 description 7
- 229910000976 Electrical steel Inorganic materials 0.000 description 5
- 239000003973 paint Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011418 maintenance treatment Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention provides a method for detecting insulation faults of a stator core of a hydraulic generator, which comprises the following steps: 1) setting the generator set to be normal: the temperature difference between iron cores, the maximum temperature value of the iron cores, the maximum temperature value of a bar and the vertical vibration peak-to-peak value of the iron cores; 2) acquiring the temperature value of each iron core, the temperature value of a coil bar and the vertical vibration peak value of the iron core through the conventional temperature sensor of the water-turbine generator set and a computer and a set online monitoring system which are connected with the temperature sensor; 3) calculating the temperature difference between every two adjacent iron cores; 4) finding out the maximum temperature value of the iron core; 5) finding out the maximum temperature value of the wire rod; 6) the maximum temperature deviation value between adjacent iron cores is greater than the normal temperature deviation value between adjacent iron cores, the maximum value of the iron core temperature is greater than the maximum temperature value of the wire rod, and the vertical vibration peak-to-peak value of the iron cores is less than the normal vertical vibration peak-to-peak value of the set iron cores; detecting insulation faults of a stator core of the hydraulic generator; 7) and (5) overhauling and eliminating faults.
Description
Technical Field
The invention relates to a method for detecting insulation faults of a stator core of a hydraulic generator, in particular to a method for detecting the insulation faults of the iron core based on the temperature of the iron core of the hydraulic generator, the temperature of a coil bar and the vertical vibration peak value of the iron core, and belongs to the technical field of generator fault detection.
Background
The hydraulic generator generally comprises a stator and a rotor, wherein the stator comprises an iron core, a coil bar, a machine base and the like. The function of the iron core is to provide a magnetic circuit for the generator, and fix the bar. The iron core is formed by overlapping silicon steel sheets with the thickness of 0.35-0.5 mm, the silicon steel sheets are coated with an insulating paint film and are fastened together through the iron core penetrating screw. The stator core is a frequent component of a generator fault, and the main reasons are that an insulating paint film between stator core laminations is easy to damage, the laminations are short-circuited, the laminations and a fastening rod form a closed loop, eddy current is generated, and the iron core is locally overheated. The short circuit between the iron core laminations is mainly caused by the following three factors that burrs exist on the edges of the silicon steel sheets or the quality of a paint film is poor; secondly, the silicon steel sheets are not pressed in place or loosened after long-term operation, so that the silicon steel sheets vibrate, and the iron core lamination is abraded and damaged after long-term operation; when the generator operates, hard objects such as metal particles fall into the stator core of the generator, and insulation between the lamination sheets is damaged. At present, the insulation fault of a stator core of a generator cannot be detected on line, so that the generator cannot work normally. Therefore, there is a need for improvements in the prior art.
Disclosure of Invention
In order to accurately detect whether the insulation of the stator core is abnormal and further avoid the abnormal operation of the generator caused by the insulation fault of the stator core of the generator, the invention provides a method for detecting the insulation fault of the stator core of the generator in real time based on the temperature change of the iron core and a wire rod and the vertical vibration peak-to-peak value change of the iron core.
Through the temperature change of the iron core and the bar and the change trend of the vertical vibration peak-to-peak value of the iron core, the insulation fault condition of the iron core of the stator is detected, so that the maintenance treatment measures are formulated in advance, the maintenance construction period is shortened, the maintenance cost is saved, and the service life of equipment is prolonged.
The invention is realized by the following technical scheme: a method for detecting insulation faults of a stator core of a hydraulic generator is characterized by comprising the following steps:
(1) setting the temperature deviation value between adjacent iron cores of the normal operation of the water turbine generator set to be TCore error correctionThe normal maximum temperature value of the iron core is TBig and upright coreThe normal maximum temperature value of the winding bar is TBig and big rodThe normal vertical vibration peak value of the iron core is SCore vibration righting；
(2) Acquiring the temperature value of each iron core, the temperature value of a coil bar and the vertical vibration peak value of the iron core through the conventional temperature sensor of the water-turbine generator set and a computer and a set online monitoring system which are connected with the temperature sensor;
(3) Calculating the temperature difference value between the adjacent iron cores according to the temperature values of the iron cores obtained in the step (2) by the following formula:
wherein:
t1 to Tn represent the temperatures of the iron cores No. 1 to n acquired by the computer;
t1the absolute value of the temperature difference of the No. 1-2 iron core is expressed as | T2-T1 |;
t2the absolute value of the temperature difference of the No. 2-3 iron core is expressed as | T3-T2 |;
…
Tn-1＝|Tn-Tn-1i represents the absolute value of the temperature difference of the iron core with the number of (n-1) -n;
tn＝|T1tn | represents the absolute value of the temperature difference of the iron cores from number 1 to n;
taking the absolute value of the maximum temperature difference as a monitoring quantity;
(4) finding out the maximum temperature value of the iron core according to the temperature of each iron core obtained in the step (2);
(5) finding out the maximum temperature value of the wire rod according to the temperature values of the wire rods obtained in the step (2);
(6) the following alignments were performed according to the following data of steps (3) to (5):
the absolute value t of the maximum temperature deviation between the adjacent iron cores in the step (3)n>Setting the normal temperature deviation value T between adjacent iron coresCore error correction；
The maximum value of the iron core temperature obtained in the step (4) is greater than the maximum temperature value of the wire rod obtained in the step (5);
the iron core vertical vibration peak value obtained in the step (2) is less than the set iron core normal vertical vibration peak value SCore vibration righting；
Detecting insulation faults of a stator core of the hydraulic generator;
(7) and (4) according to the detection result of the step (6), making maintenance and treatment measures so as to repair the failed iron core during maintenance.
The principle of the invention is as follows:
the bar of generator is fixed in the stator core lamination, when the insulating fault of generator core appears, can cause the iron core temperature local rising. But the temperature of the iron core is also increased due to the factors of the exceeding of the vertical vibration of the iron core, the heating of the stator bar and the like. Therefore, only if: and when the three conditions that the temperature deviation value of the iron core is greater than the normal temperature deviation value between the set adjacent iron cores, the maximum temperature value of the stator iron core is greater than the maximum temperature value of the wire rod, and the vertical vibration peak-to-peak value of the iron core is less than the normal vertical vibration peak-to-peak value of the set iron core, the iron core insulation fault can be judged.
The invention has the following advantages and effects:
the real-time detection of the insulation fault of the stator core of the generator is realized, the manual analysis by personnel is not needed, the labor intensity of the personnel is reduced, the working efficiency is improved, the analysis result difference caused by the professional technical difference of the personnel is avoided, and the industry knowledge is inherited; when the iron core has slight fault, early warning can be sensitively carried out, the fault expansion is prevented, and the economic loss caused by the fault expansion and rush repair is reduced.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
In this embodiment 1, the actual detection is performed by taking the operating condition of a hydroelectric generating set No. 3/4 in 2019 of a certain power plant as an example, the number of the temperature measuring points of the iron core of the hydroelectric generating set is 20, the temperature measuring points are numbered according to the sequence of 1-20, the number of the temperature measuring points of the coil bar is 20, the temperature measuring points are numbered according to the sequence of 1-20, and one vertical vibration measuring point of the iron core is provided, which includes the following steps:
(10) setting the temperature deviation value between adjacent iron cores of the normal operation of the water turbine generator set to be TDeviation of iron coreWhen the temperature is 9 ℃, the normal maximum temperature value of the iron core is TBig and upright core67.0 deg.C, normal maximum temperature value of winding bar is TBig and big rod65.1 deg.C, normal vertical vibration peak value of iron core is SIron core is just＝80μm；
(2) Acquiring the temperature values of the iron cores and the bar and the vertical vibration peak value of the iron cores through the conventional temperature sensor of the water-turbine generator set and a computer and a set online monitoring system connected with the temperature sensor;
the vertical vibration of the iron core is 17.7 μm;
(3) calculating the temperature deviation value between the adjacent iron cores according to the temperature values of the iron cores obtained in the step (2) and the following formula:
wherein:
t1 to Tn represent the temperatures of the iron cores No. 1 to n acquired by the computer;
t1the absolute value of the temperature difference of the No. 1-2 iron core is expressed as | T2-T1 |;
t2the absolute value of the temperature difference of the No. 2-3 iron core is expressed as | T3-T2 |;
…
Tn-1＝|Tn-Tn-1I represents the absolute value of the temperature difference of the iron core with the number of (n-1) -n;
tn＝|T1tn | represents the absolute value of the temperature difference of the iron cores from number 1 to n;
taking the absolute value of the maximum temperature difference of 11.2 ℃ as a monitoring quantity;
(4) finding out 67.0 ℃ of the No. 10 iron core temperature according to the iron core temperatures obtained in the step (2);
(5) finding out the temperature of a No. 4 wire rod as a maximum temperature value 65.1 ℃ according to the temperature values of the wire rods obtained in the step (2);
(6) performing the following comparison based on the following calculation data obtained in steps (3) to (5):
and (3) setting the temperature difference between the adjacent iron cores at 11.2 ℃ to 9 ℃.
The maximum value of the iron core temperature obtained in the step (4) is 67.0 ℃ > the maximum value of the wire rod obtained in the step (5) is 65.1 ℃ ";
the peak value of the vertical vibration peak of the iron core obtained in the step (2) is 17.7 mu m<Setting the normal vertical vibration peak value S of the iron coreCore vibration righting＝80μm；
Detecting insulation faults of a stator core of the hydraulic generator;
(7) according to the detection result in the step (6), making maintenance and treatment measures, and repairing the failed iron core;
(8) after the iron core is insulated and repaired, the temperature values of the iron cores and the bar and the vertical vibration peak value of the iron cores are obtained through the existing temperature sensor of the water-turbine generator set and the computer and the set online monitoring system which are connected with the existing temperature sensor;
The core vertical vibration was 17.7 μm.
(9) And (4) according to the temperature values of the iron cores obtained in the step (8), calculating the temperature deviation value between every two adjacent iron cores again:
(10) the maximum temperature of the iron core is 58.3 ℃ after maintenance, and is 65.6 ℃ lower than the maximum temperature of the wire rod; the vertical vibration of the iron core is 17.7 mu m and is less than the set normal vertical vibration peak value S of the iron coreCore vibration rightingThe maximum temperature difference value of the iron core is 2.3 ℃ and is less than the set value of 9 ℃;
the invention eliminates the insulation fault of the stator iron core after the iron core is insulated by overhauling, and proves that the invention has effective, accurate and reliable detection.
Claims (1)
1. A method for detecting insulation faults of a stator core of a hydraulic generator is characterized by comprising the following steps:
1) setting the temperature deviation value between adjacent iron cores of the normal operation of the water turbine generator set to be TCore error correctionThe normal maximum temperature value of the iron core is TBig and upright coreThe normal maximum temperature value of the winding bar is TBig and big rodThe normal vertical vibration peak value of the iron core is SCore vibration righting；
2) Acquiring the temperature value of each iron core, the temperature value of a coil bar and the vertical vibration peak value of the iron core through the conventional temperature sensor of the water-turbine generator set and a computer and a set online monitoring system which are connected with the temperature sensor;
3) calculating the temperature difference value between the adjacent iron cores according to the temperature values of the iron cores obtained in the step 2) by the following formula:
t1＝|T2-T1|
t2＝|T3-T2|
t3＝|T4-T3|
…
tn-1＝|Tn-Tn-1|
tn＝＝|T1-Tn|
Wherein:
t1 to Tn represent the temperatures of the iron cores No. 1 to n acquired by the computer;
t1the absolute value of the temperature difference of the No. 1-2 iron core is expressed as | T2-T1 |;
t2the absolute value of the temperature difference of the No. 2-3 iron core is expressed as | T3-T2 |;
…
Tn-1＝|Tn-Tn-1i represents the absolute value of the temperature difference of the iron core with the number of (n-1) -n;
tn＝|T1tn | represents the absolute value of the temperature difference of the iron cores from number 1 to n;
taking the absolute value of the maximum temperature difference as a monitoring quantity;
4) finding out the maximum temperature value of the iron core according to the temperature of each iron core obtained in the step 2);
5) finding out the maximum temperature value of the wire rod according to the temperature values of the wire rods obtained in the step 2);
6) the following alignments were performed according to the following data of steps 3) -5):
maximum temperature deviation absolute value t between adjacent iron cores in step 3)n>Setting the normal temperature deviation value T between adjacent iron coresCore error correction；
The maximum value of the iron core temperature obtained in the step 4) is greater than the maximum temperature value of the wire rod obtained in the step 5);
the iron core vertical vibration peak value obtained in the step 2) is less than the set iron core normal vertical vibration peak value SCore vibration righting；
Detecting insulation faults of a stator core of the hydraulic generator;
7) and (6) according to the detection result of the step 6), making maintenance and treatment measures so as to repair the failed iron core during maintenance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010480818.3A CN111856271A (en) | 2020-05-30 | 2020-05-30 | Insulation fault detection method for stator core of hydraulic generator |
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| CN202010480818.3A CN111856271A (en) | 2020-05-30 | 2020-05-30 | Insulation fault detection method for stator core of hydraulic generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114186666A (en) * | 2021-11-29 | 2022-03-15 | 中电华创(苏州)电力技术研究有限公司 | Generator coil temperature anomaly monitoring method based on self-standardization encoding and decoding |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006050746A (en) * | 2004-08-03 | 2006-02-16 | Nissan Motor Co Ltd | Temperature prediction device for rotary electric machine |
| JP2009106005A (en) * | 2007-10-19 | 2009-05-14 | Toshiba Corp | Stator of rotating electric machine |
| CN104362804A (en) * | 2014-10-22 | 2015-02-18 | 白山发电厂 | Hydro-generator stator coil bar fault treatment method |
| CN205753695U (en) * | 2016-05-11 | 2016-11-30 | 哈尔滨理工大学 | A kind of cincture winding groove type hydraulic generator stator being beneficial to heat radiation |
| CN207281814U (en) * | 2017-10-27 | 2018-04-27 | 浙江浙能技术研究院有限公司 | A kind of generator evaluation system |
-
2020
- 2020-05-30 CN CN202010480818.3A patent/CN111856271A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006050746A (en) * | 2004-08-03 | 2006-02-16 | Nissan Motor Co Ltd | Temperature prediction device for rotary electric machine |
| JP2009106005A (en) * | 2007-10-19 | 2009-05-14 | Toshiba Corp | Stator of rotating electric machine |
| CN104362804A (en) * | 2014-10-22 | 2015-02-18 | 白山发电厂 | Hydro-generator stator coil bar fault treatment method |
| CN205753695U (en) * | 2016-05-11 | 2016-11-30 | 哈尔滨理工大学 | A kind of cincture winding groove type hydraulic generator stator being beneficial to heat radiation |
| CN207281814U (en) * | 2017-10-27 | 2018-04-27 | 浙江浙能技术研究院有限公司 | A kind of generator evaluation system |
Non-Patent Citations (1)
| Title |
|---|
| 熊荣等: "枕头坝一级水电站发电机定子磁化试验", 《水电与新能源》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114186666A (en) * | 2021-11-29 | 2022-03-15 | 中电华创(苏州)电力技术研究有限公司 | Generator coil temperature anomaly monitoring method based on self-standardization encoding and decoding |
| CN114186666B (en) * | 2021-11-29 | 2023-10-13 | 中电华创(苏州)电力技术研究有限公司 | Generator coil temperature anomaly monitoring method based on self-standardized encoding and decoding |
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