CN114325271A - Bearing voltage withstand test method and method for inhibiting partial discharge of bearing - Google Patents
Bearing voltage withstand test method and method for inhibiting partial discharge of bearing Download PDFInfo
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- CN114325271A CN114325271A CN202111666042.5A CN202111666042A CN114325271A CN 114325271 A CN114325271 A CN 114325271A CN 202111666042 A CN202111666042 A CN 202111666042A CN 114325271 A CN114325271 A CN 114325271A
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Abstract
The application discloses a bearing withstand voltage test method and a method for inhibiting partial discharge of a bearing. The bearing withstand voltage testing method is based on a discharge gap structure constructed between the bearing ring and the movable body, electric signals can be collected on the bearing ring and the movable body under the condition that the bearing operates and insulating oil between bearing gaps breaks down under the action of first testing voltage, and therefore local discharge is determined to occur according to the collected electric signals, applied testing voltage can be determined to be the withstand voltage of the bearing, testing operation is simple, the bearing structure does not need to be modified, and testing difficulty is reduced.
Description
Technical Field
The application belongs to the technical field of machinery, and particularly relates to a bearing withstand voltage testing method and a method for inhibiting partial discharge of a bearing.
Background
The shaft voltage is the potential difference across the shaft, the shaft section and the shaft to ground during operation of the generator. Shaft voltage is an electrical phenomenon commonly existing in the running process of a generator, and a large-scale and high-speed generator is particularly serious.
In the related art, the axis voltage is generally measured by voltammetry. The voltammetry testing method needs to modify the bearing in various ways, is high in cost, can test the shaft voltage only after the bearing is degraded to a certain degree due to the shaft voltage, and is poor in testing effect.
Disclosure of Invention
The embodiment of the application provides a bearing withstand voltage test method and a method for inhibiting partial discharge of a bearing, the test operation is simple, and the bearing is not required to be excessively transformed.
On one hand, the embodiment of the application provides a bearing pressure resistance test method, wherein a bearing comprises a ferrule; a movable body is arranged in the ferrule, and a gap is formed between the ferrule and the movable body; the gap is filled with insulating oil;
the method comprises the following steps:
applying a first test voltage to the bearing with the bearing running;
collecting a first electric signal at a first position on the collar and a second electric signal at a second position on the movable body;
and acquiring a first set of shaft voltage tolerance data of the bearing according to the first electric signal and the second electric signal.
The bearing voltage withstand test method of the embodiment of the application is based on the discharge gap structure constructed between the bearing ring and the movable body, under the condition that the insulating oil between the bearing ring and the movable body breaks down under the action of the first test voltage during the operation of the bearing, the electric signals can be collected on the bearing ring and the movable body, therefore, the partial discharge is determined to occur according to the collected electric signals, the bearing withstand voltage can be determined based on the applied test voltage, the test operation is simple, the bearing structure is not required to be transformed, and the test difficulty is reduced.
In some embodiments, obtaining a first set of shaft voltage tolerance data for the bearing from the first electrical signal and the second electrical signal comprises:
under the condition that the first electric signal and the second electric signal are collected, determining the first test voltage as the withstand voltage of the bearing;
the first set of axis voltage tolerance data includes voltage values of the tolerance voltages.
In some embodiments, obtaining a first set of shaft voltage tolerance data for the bearing from the first electrical signal and the second electrical signal further comprises:
acquiring a partial discharge parameter between the ferrule and the movable body under the condition that the insulating oil is broken down according to the first electric signal and the second electric signal;
the first set of shaft voltage tolerance data for the bearing further includes partial discharge parameters.
In some embodiments, the partial discharge parameter is an amount of partial discharge.
In the embodiment of the application, the first electric signal and the second electric signal can be acquired through the probe of an external testing instrument (such as a partial discharge testing instrument), so that the partial discharge electric quantity parameter can be obtained through testing while the bearing is tested to generate partial discharge, and the quantitative testing of the bearing on the tolerance degree of partial discharge energy is realized.
In some embodiments, after acquiring the first set of shaft voltage withstand data for the bearing, the method further comprises:
applying a second test voltage to the bearing while the bearing is running, the second test voltage being different from the first test voltage;
so that the insulating oil is punctured again, and a third electric signal at the first position and a fourth electric signal at the second position are collected;
and acquiring a second group of shaft voltage tolerance data of the bearing according to the third electric signal and the fourth electric signal.
In some embodiments, after acquiring the second set of shaft voltage withstand data for the bearing, the method further comprises:
and acquiring the shaft voltage tolerance value range of the bearing according to the first group of shaft voltage tolerance data and the second group of shaft voltage tolerance data.
In the embodiment of the application, the bearing can be tested under different voltages by applying different test voltages to the bearing, so that the shaft voltage tolerance value range of the bearing can be determined.
In some embodiments, prior to applying the first test voltage to the bearing with the bearing running, the method further comprises:
providing a first electrical conductor on the ferrule, an
A second electric conductor is arranged on the movable body, wherein
The first electrical conductor contacts or connects to the first location and the second electrical conductor contacts or connects to the second location.
In the embodiment of the application, the test efficiency can be improved by simply constructing the electric conductor structure on the bearing.
In some embodiments, during the acquisition of the first electrical signal at the first position on the collar and the second electrical signal at the second position on the movable body, the first electrical signal and the second electrical signal are acquired by contacting a positive test terminal and a negative test terminal of the detection instrument to the first position and the second position, respectively.
In some embodiments, the bearing is a rolling bearing, and the movable body arranged in the ring is a rolling body; or the bearing is a sliding bearing, the ferrule is a bearing bush, and the movable body arranged in the ferrule is a shaft neck.
On the other hand, an embodiment of the present application further provides a method for suppressing partial discharge of a bearing according to the shaft voltage tolerance data obtained by the method described in any embodiment of the foregoing aspect, including:
determining a voltage tolerance value of a corresponding bearing according to the shaft voltage tolerance data;
and adjusting the output voltage of the generator where the corresponding bearing is located according to the voltage tolerance value so as to inhibit the occurrence of partial discharge on the corresponding bearing.
According to the method for inhibiting the partial discharge of the bearing, the output voltage of the generator where the bearing is located can be adjusted based on the shaft voltage tolerance data obtained by the withstand voltage testing method, so that the shaft voltage generated by the partial discharge of the bearing on the generator is inhibited, and the aims of reducing the fault rate of the bearing and prolonging the service life of the bearing are fulfilled.
In another aspect, an embodiment of the present application provides a wind turbine generator system, where the wind turbine generator system is configured to adjust an output voltage according to the method for suppressing bearing discharge described in the foregoing embodiment, so as to suppress occurrence of partial discharge on a corresponding bearing in the wind turbine generator system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly described below, and for those skilled in the art, other drawings may be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a bearing according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of a bearing pressure resistance testing method provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of an equivalent circuit of a bearing discharge gap in an exemplary embodiment of the present application;
FIG. 4 is a schematic flow chart of a bearing withstand voltage testing method according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a method for suppressing partial discharge of a bearing according to another embodiment of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.
In a natural state, when the shaft voltage of the generator is low, discharge is not easy to occur due to the insulation effect of a bearing lubricating oil film. However, when the shaft voltage is high, the surface of the bearing pad has defects, the oil quality or flow rate of the lubricating oil is not up to standard, and the generator vibrates abnormally, the oil film may break down, which causes the shaft to come into metallic contact with the pad, and partial discharge (hereinafter, also referred to as "partial discharge") is formed, and instantaneous shaft current is generated.
The bearing corrosion caused by the shaft voltage is an accelerating process, metal on the surface of a bearing bush can be slightly and locally melted by one-time discharging, metal particles are formed in an oil film, the insulation of the oil film is damaged, discharging is easier to occur, chain reaction is formed, vibration of a unit is caused, and finally irreversible damage is caused. According to the international association statistics, the generator failure due to bearing failure is about 20% of the total number of failures, and among them, the bearing failure due to shaft voltage and shaft current accounts for 30% of the total number of failures, which is an important cause of damage.
In contrast, in the related art, a voltammetry method is generally used for testing, that is, voltage and current of a no-load bearing and a loaded bearing are detected, if breakdown does not occur, the detected current and voltage have a certain phase angle, and once the limit voltage of oil film breakdown is reached, the phase of the detected current and the phase of the detected voltage are the same, so that the voltage value which can be endured by the bearing can be judged.
But the use of voltammetry testing requires multiple modifications to the bearing. Because the tested current value is an indirect test and the discharge of the bearing cannot be directly tested, the test is judged by detecting the phase change of voltage and current, and certain errors are caused during the test. In practical applications, when the phase is judged to start to change based on the test voltage/current graph, the bearing is subjected to voltage which causes the bearing to have frequent discharge conditions. Because the bearing discharge is just partial discharge, then the grease rotation can recover the breakdown point, so that the number of the discharge points is small, the voltage when the partial discharge occurs is the discharge starting voltage which can not be accepted by the bearing, but the discharge voltage which can be measured by the voltammetry and is degraded after the bearing is damaged for a period of time, so that the failure rate caused by the damage of the bearing can not be reduced to a certain extent by the voltammetry test, and the discharge amount can not be quantitatively tested by the method, so that the total energy can not be calculated.
In order to solve the problems in the prior art, embodiments of the present application provide a bearing withstand voltage test method and a method for suppressing partial discharge of a bearing, which are based on a discharge gap formed when a bearing structure generates partial discharge, and can directly determine that the bearing generates partial discharge by detecting an electrical signal generated by the gap, thereby determining a withstand voltage condition of the bearing.
The bearing structure in the embodiment of the present application will be described first.
The bearing in the embodiment of the present application includes a ring; a movable body is arranged in the ferrule, and a gap is formed between the ferrule and the movable body; the gap is filled with insulating oil, and when the bearing operates, the insulating oil can fill the gap to isolate the ferrule and the movable body, so that the effects of lubrication and insulation are achieved.
For example, the bearing may be a rolling bearing or a sliding bearing, but is not limited thereto. Wherein, if the bearing is a rolling bearing, the movable body arranged in the ring is a rolling body; if the bearing is a sliding bearing, the bearing ring is a bearing bush, and the movable body arranged in the bearing ring is a shaft neck.
Fig. 1 is a schematic structural view of a rolling bearing in a specific example of the present application. As shown in fig. 1, rolling bearings 101 are disposed at two ends of a shaft 102 in a generator 100, and a race of the rolling bearing 101 includes an outer ring 103 and an inner ring 104, the inner ring and the outer ring form a raceway (not shown), and a plurality of rolling bodies 105 (i.e., rollers) are disposed in the raceway with gaps therebetween. During the operation of the bearing, the insulating oil is filled into the gap to form a thin insulating oil film.
The bearing withstand voltage test method provided by the embodiment of the present application is described below by taking the rolling bearing shown in fig. 1 as an example.
Fig. 2 shows a schematic flow chart of a bearing withstand voltage testing method provided in an embodiment of the present application. As shown in fig. 2, the method may include steps S201 to S203:
s201, under the condition that the bearing runs, a first test voltage is applied to the bearing.
S202, collecting a first electric signal at a first position on a collar and a second electric signal at a second position on a movable body;
s203, acquiring a first group of shaft voltage tolerance data of the bearing according to the first electric signal and the second electric signal.
In the bearing withstand voltage test method according to the embodiment of the present application, referring to the bearing structure shown in fig. 1, when the bearing 101 is in operation, the gap between the ring and the movable body of the bearing 101 is filled with insulating oil, and when partial discharge occurs in the bearing, the gap structure formed by the ring, the movable body, and the insulating oil can be regarded as an electrical equivalent circuit of a capacitor combination formed by the discharge gap as shown in fig. 3. Wherein, CgCapacitance for equivalent of bubbles in insulating oil, CbIs and CgCapacitance of the series part, CbCan be regarded as the part where the insulating oil is not broken down; cmIs in addition to CbAnd CgAnd the other is equivalent to the capacitance of the remaining part between the ferrule and the movable body. VtApplying an alternating voltage V to the outside of the ferrule and the movable bodygIs a capacitor CgBreakdown voltage at discharge. Then, referring to the principle of the circuit shown in fig. 3, when an externally applied alternating voltage V is applied between the ferrule and the movable bodytWhen the (instantaneous value) reaches a certain value, the capacitance CgThe voltage at both ends is increased as the capacitor CgVoltage up to breakdown voltage VgWhen this occurs, a breakdown discharge occurs.
Therefore, based on the same principle, in step S201, when the first test voltage is applied to the bearing in the case where the bearing is operated, the insulating oil may be caused to break down by the first test voltage. At this time, a breakdown discharge occurs between the ferrule and the movable body, and a current is generated.
Therefore, the first position on the ferrule and the second position on the movable body can be detected by the external test instrument in step S202, when the bearing generates partial discharge and the gap of the bearing generates partial discharge current, the external test instrument can directly collect the first electrical signal of the first position on the ferrule and the second electrical signal of the second position on the movable body, and then the occurrence of partial discharge of the bearing can be determined based on the collected electrical signals.
It should be understood that the first position may be any position on the ferrule, and the second position may be any position on the movable body, which is not limited in the embodiments of the present application.
Correspondingly, a first set of shaft voltage tolerance data of the bearing can be obtained according to the first electrical signal and the second electrical signal by step S203.
The testing method is simple to operate, a bearing structure does not need to be modified, and testing difficulty is reduced; and the test can be completed in the initial stage of discharge, the partial discharge signal generated on the bearing can be detected, and compared with the voltammetry, the voltage tolerance data of the bearing can be more accurately tested, so that the excessive damage of the bearing is avoided.
For example, in the step S203, acquiring a first set of shaft voltage tolerance data of the bearing according to the first electrical signal and the second electrical signal may specifically include the step S2031:
s2031, under the condition that the first electrical signal and the second electrical signal are collected, determining a first test voltage as a bearing withstand voltage;
wherein the first set of axis voltage tolerance data includes voltage values of the tolerance voltages.
In the embodiment of the application, the discharge gap structure based on the bearing can be detected from the first position of the ferrule and the second position of the movable body by an external test instrument. The damage mechanism of the bearing caused by the shaft voltage is instantaneous breakdown, so that the local current is rapidly increased, the energy is rapidly accumulated, and the bearing is melted to cause electric erosion. Therefore, in this embodiment, when the external test instrument tests the electrical signal from the first position and the second position, it can be determined that the partial discharge has occurred. And then can confirm first test voltage value as the withstand voltage value of bearing, just can realize the monitoring test to bearing shaft voltage from the initial stage of discharging like this, and then in time adjust generator voltage, improve the life of bearing.
In order to comprehensively test the shaft voltage tolerance condition of the bearing, optionally, in this embodiment of the application, in the step S203, according to the first electrical signal and the second electrical signal, the first group of shaft voltage tolerance data of the bearing is acquired, and specifically, the method may further include the step S2032:
s2032, acquiring partial discharge parameters between the ferrule and the movable body under the condition that the insulating oil is broken down according to the first electric signal and the second electric signal;
wherein the first set of shaft voltage tolerance data for the bearing further comprises partial discharge parameters. The partial discharge parameter may be a partial discharge amount.
In the process of collecting a first electric signal at a first position on the collar and a second electric signal at a second position on the movable body, the positive electrode test terminal and the negative electrode test terminal of the detection instrument respectively contact the first position and the second position, and the first electric signal and the second electric signal can be collected. Therefore, partial discharge is detected according to the collected electric signals, and the bearing withstand voltage is determined.
Furthermore, the first electrical signal and the second electrical signal are collected by an external testing instrument (such as a partial discharge tester), and a partial discharge charge parameter between the ferrule and the movable body in the case of breakdown of the insulating oil, that is, a discharge amount, can be determined based on the collected electrical signals.
In the embodiment of the application, the probe of the external test instrument can collect the first electric signal and the second electric signal, so that the partial discharge electric quantity parameter can be obtained by testing when the bearing is tested to generate partial discharge, and then the partial discharge quantity is determined.
Energy can be evaluated according to the discharge amount, and the larger the energy generated by partial discharge is, the larger the electric erosion damage to the bearing is, so that the quantitative test of the bearing on the tolerance degree of the partial discharge energy can be realized, and the reliable evaluation of the bearing tolerance energy is achieved.
For example, in order to accurately test the bearing shaft voltage tolerance, the test voltage applied to the bearing can be increased from small to large. When the first and second electrical signals are tested on the bearing based on the test voltage applied thereto, the test voltage may be determined as the initial withstand voltage of the bearing.
In the embodiment of the present application, after the first set of shaft voltage tolerance data of the bearing is acquired in step S203, the method further includes steps S204 to S206:
s204, under the condition that the bearing operates, applying a second test voltage to the bearing, wherein the second test voltage is different from the first test voltage;
s205, the bearing insulating oil is broken down again, and a third electric signal at the first position and a fourth electric signal at the second position are collected;
s206, acquiring second group of shaft voltage tolerance data of the bearing according to the third electric signal and the fourth electric signal.
In the embodiment of the present application, the second test voltage is applied to the bearing again in step S204, so that the insulating oil in the bearing is broken down. Thus, based on the discharge gap formed by the bearing, the electrical signals are collected again at the first position of the ferrule and the second position of the movable body through step S205, thereby determining whether the partial discharge occurs. Then, a second set of shaft voltage withstand data is acquired based on the third electrical signal and the fourth electrical signal by step S206. Wherein the second set of shaft voltage tolerance data may include a tolerance voltage value and a partial discharge power amount.
For bearings, if a partial discharge occurs on the bearing, the test voltage applied to the bearing is actually already the breakdown voltage of the bearing. Therefore, in order to obtain the relationship between the applied voltage and the bearing shaft voltage tolerance condition in the test, the partial discharge condition of the bearing under different test voltages can be tested through the steps S204 to S206. Among the reasons for the occurrence of partial discharge in the bearing are that the flow rate of the insulating oil is not up to standard, and the oil is easily broken down due to impurities or bubbles, etc., but since the bearing is operated when a voltage is applied to the bearing, the broken-down portion of the insulating oil is recovered along with the operation of the bearing in the first test process, and the easily broken-down portion of the insulating oil is also changed along with the flow of the oil, so that the test voltage value at which partial discharge occurs in each test process may be different. Therefore, in the embodiment of the application, the starting voltage of the partial discharge can be gradually and accurately generated in the repeated test process, and the starting voltage is taken as a critical value, so that the tolerable range of the bearing can be further obtained.
For example, when the first test voltage applied to the bearing is 5V, partial discharge occurs in the discharge gap of the bearing, and 5V can be determined as a tolerance value of the bearing. The test voltages can then be adjusted incrementally, such as 6V and 7V; if electrical signals are collected on the bearing ring and the movable body (i.e. partial discharge occurs) when both 6V and 7V are applied, it can be basically stated that a voltage of 5V is a voltage that causes partial discharge of the bearing, not an occasional data. This allows the test voltage to be adjusted incrementally from 5V, such as 4V and 3V; if no electric signal is collected on the bearing ring and the movable body when 4V and 3V are applied, the voltage of 5V can be basically explained as the initial voltage of partial discharge of the bearing, and the voltage value range below 5V is the tolerable tolerance value range of the bearing.
Thus, for example, after obtaining the second set of shaft voltage tolerance data of the bearing in step S206, the method further includes step S207:
and S207, acquiring a shaft voltage tolerance value range of the bearing according to the first group of shaft voltage tolerance data and the second group of shaft voltage tolerance data.
In the embodiment of the application, the bearing can be tested under different voltages by applying different test voltages to the bearing, so that the shaft voltage tolerance value range of the bearing can be determined.
It should be understood that the shaft voltage tolerance value range of the bearing may also be obtained by multiple measurements.
In order to improve the efficiency of the test, optionally, in the embodiment of the present application, the centralized collection of the partial discharge signal may be realized by simply configuring a conductor structure on the bearing. Specifically, before step S201, the method may further include steps S208 to S209:
s208, arranging a first conductor on the ferrule, and
s209, arranging a second conductor on the movable body,
the first conductor is in contact with or connected to the first position, and the second conductor is in contact with or connected to the second position.
The first conductor and the second conductor may be metal electrodes, such as aluminum foil electrodes, copper foil electrodes, iron foil electrodes, and the like, which have good electrical conductivity. The metal electrode can be connected on the ferrule and the movable body, and in order to avoid hindering the operation of the bearing, the metal electrode is detachably connected with the ferrule and the movable body, and only needs to be in contact connection with the ferrule and the movable body during testing, and the positive and negative metal electrodes are respectively attached to the surfaces of the ferrule and the movable body.
Therefore, the current generated by the ferrule and the movable body when partial discharge occurs can be released in a centralized manner through the first conductor and the second conductor, so that the electric signal acquisition is facilitated, and the testing efficiency is improved.
Because the shaft voltage can only be inhibited as much as possible and can almost not be completely eliminated, the shaft voltage value which can be endured by the bearing test is very important, and the output voltage of the generator can be correspondingly adjusted through the tested bearing voltage withstand data, so that the occurrence of partial discharge on the bearing is inhibited, the generator fault caused by bearing damage is favorably avoided, and the service life of the bearing is prolonged.
Fig. 5 shows a schematic flow chart of a method for suppressing partial discharge of a bearing according to an embodiment of the present application. As shown in fig. 5, the method is implemented according to the shaft voltage tolerance data obtained by the bearing tolerance test method according to any of the embodiments, and specifically includes steps S501 to S502:
s501, determining a voltage tolerance value of a corresponding bearing according to shaft voltage tolerance data;
s502, according to the voltage tolerance value, the output voltage of the generator where the corresponding bearing is located is adjusted so as to inhibit the occurrence of partial discharge on the corresponding bearing.
The method for suppressing the partial discharge of the bearing in the embodiment of the application can be based on the shaft voltage tolerance data obtained by the bearing withstand voltage testing method in the embodiment, the data comprises the voltage value (namely, the voltage tolerance value) which can be tolerated by the bearing, and the output voltage of the generator where the bearing is located is adjusted based on the bearing voltage tolerance value determined by the shaft voltage tolerance data, so that the shaft voltage generated by the partial discharge of the bearing on the generator is suppressed, and the aims of reducing the fault rate of the bearing and prolonging the service life are fulfilled.
In another aspect, an embodiment of the present application provides a wind turbine generator system, where the wind turbine generator system is configured to adjust an output voltage according to the method for suppressing bearing discharge described in the foregoing embodiment, so as to suppress occurrence of partial discharge on a corresponding bearing in the wind turbine generator system.
The embodiment of the application can obtain the shaft voltage tolerance data of the bearing without modifying the bearing structure, so that the output voltage of the wind generating set is adjusted based on the shaft voltage tolerance data, the generator fault caused by the partial discharge corrosion damage of the bearing is avoided, and the stable operation capacity of the wind generating set is improved.
As described above, only the specific embodiments of the present application are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.
Claims (10)
1. A bearing pressure resistance test method comprises a bearing ring; a movable body is arranged in the ferrule, and a gap is formed between the ferrule and the movable body; the gap is filled with insulating oil;
characterized in that the method comprises:
applying a first test voltage to the bearing while the bearing is running;
acquiring a first electric signal at a first position on the collar and a second electric signal at a second position on the movable body;
and acquiring a first group of shaft voltage tolerance data of the bearing according to the first electric signal and the second electric signal.
2. The method of claim 1, wherein obtaining a first set of shaft voltage tolerance data for the bearing from the first electrical signal and the second electrical signal comprises:
determining the first test voltage as a withstand voltage of the bearing under the condition that the first electrical signal and the second electrical signal are acquired;
the first set of axis voltage tolerance data includes voltage values of the tolerance voltages.
3. The method of claim 2, wherein obtaining a first set of shaft voltage tolerance data for the bearing from the first electrical signal and the second electrical signal further comprises:
acquiring a partial discharge parameter between the ferrule and the movable body under the condition that the insulating oil is broken down according to the first electric signal and the second electric signal;
the first set of shaft voltage tolerance data for the bearing further includes the partial discharge parameter.
4. The method of claim 3, wherein the partial discharge parameter is an amount of partial discharge.
5. The method of claim 2, wherein after acquiring the first set of shaft voltage tolerance data for the bearing, the method further comprises:
applying a second test voltage to the bearing while the bearing is running, the second test voltage being different from the first test voltage;
causing the dielectric oil to be broken down again and collecting a third electrical signal at the first location and a fourth electrical signal at the second location;
and acquiring a second group of shaft voltage tolerance data of the bearing according to the third electric signal and the fourth electric signal.
6. The method of claim 5, wherein after acquiring the second set of shaft voltage tolerance data for the bearing, the method further comprises:
and acquiring a shaft voltage tolerance value range of the bearing according to the first group of shaft voltage tolerance data and the second group of shaft voltage tolerance data.
7. The method of claim 1, wherein, with the bearing in operation, prior to applying the first test voltage to the bearing, the method further comprises:
providing a first electrical conductor on the ferrule, an
A second electric conductor is arranged on the movable body, wherein
The first conductor contacts or is connected to the first location and the second conductor contacts or is connected to the second location.
8. The method according to any one of claims 1 to 7,
the bearing is a rolling bearing;
the movable body arranged in the ferrule is a rolling body; or
The bearing is a sliding bearing;
the ferrule is a bearing bush;
the movable body arranged in the ferrule is a shaft neck.
9. A method of suppressing partial discharge in a bearing according to shaft voltage tolerance data obtained by the method of any one of claims 1 to 7, comprising:
determining a voltage tolerance value of a corresponding bearing according to the shaft voltage tolerance data;
and adjusting the output voltage of the generator where the corresponding bearing is positioned according to the voltage tolerance value so as to inhibit the occurrence of partial discharge on the corresponding bearing.
10. A wind generating set is characterized in that: the wind park adjusts the output voltage according to the method of claim 9 to suppress the occurrence of partial discharges on the corresponding bearings in the wind park.
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Cited By (1)
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| CN116760225A (en) * | 2023-05-23 | 2023-09-15 | 小米汽车科技有限公司 | Method and device for treating shaft electric damage, vehicle and storage medium |
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