Generator shaft voltage and bearing bush insulation on-line testing device

Abstract

The invention provides a generator shaft voltage and bearing bush insulation on-line test device. The device comprises a first switch, a test loop and a voltage analysis comparator. When the first switch is closed, the on-line testing device is electrified, and when the first switch is disconnected, the on-line testing device is powered off; the first end of the test loop is electrically connected with the output end of the first switch, the test loop comprises a shaft voltage test loop and a bearing bush insulation test loop, and the test loop is used for obtaining a shaft voltage test result and a bearing bush insulation test result; and the voltage analysis comparator is used for analyzing the shaft voltage test result and the bearing bush insulation test result.

Description

Technical Field

[0001] The present disclosure relates to the field of testing devices, and in particular to an online testing device for generator shaft voltage and bearing insulation. Background Art

[0002] In related programs, such as Figure 1 As shown, the shaft voltage test meter U1 is the voltage at both ends of the generator shaft; the insulation of the bearing shell needs to be analyzed and judged by comparing the voltage U1 at both ends of the generator shaft and the voltage U2 of the bearing seat to the ground. If the voltage U1 at both ends of the shaft is greater than the voltage U2 of the bearing seat to the ground, it means that the insulation test of the bearing shell is wrong; if the voltage U1 at both ends of the shaft is less than the voltage U2 of the bearing seat to the ground, it means that the insulation of the bearing shell is poor. If the voltage U1 at both ends of the shaft is equal to the voltage U2 of the bearing seat to the ground, it means that the insulation of the bearing shell is good. The voltage U1 at both ends of the shaft and the voltage U2 of the bearing seat to the ground in the related technology need to be measured separately, and it cannot be guaranteed that the two values ​​are measured at the same time. There are test errors. Each test must be carried out by professionals. The test results must be compared and analyzed by professionals before a conclusion can be drawn, which consumes a lot of manpower. In addition, for the staff, there are great safety hazards when installing temporary grounding electrodes and testing connections. Summary of the invention

[0003] The present invention provides an online testing device for generator shaft voltage and bearing insulation to solve the problems in the related art.

[0004] The generator shaft voltage and bearing insulation online testing device provided by the embodiment of the present disclosure includes: The first switch, the test circuit and the voltage analysis comparator; The first switch is closed to energize the online testing device, and the first switch is opened to de-energize the online testing device; The first end of the test circuit is electrically connected to the output end of the first switch, the test circuit includes a shaft voltage test circuit and a bearing insulation test circuit, and the test circuit is used to obtain shaft voltage test results and bearing insulation test results; The voltage analysis comparator is used to analyze the shaft voltage test results and the bearing insulation test results.

[0005] In one embodiment, the first switch is a molded case circuit breaker.

[0006] In one embodiment, the shaft voltage test circuit includes: Shaft voltage test button and first voltage collector; The first end of the shaft voltage test button is electrically connected to the output end of the first switch, and the shaft voltage test button is used to control the closing and opening of the shaft voltage test loop; The first end of the first voltage collector is electrically connected to the second end of the shaft voltage test button, and the first voltage collector is used to collect shaft voltage.

[0007] In one embodiment, the shaft voltage test circuit further includes a first contactor; The first contactor is arranged between the shaft voltage test button and the first voltage collector, and the first contactor is used to control the closing and opening of the shaft voltage test loop.

[0008] In one embodiment, the bearing insulation test circuit includes: A bearing insulation test button, a first voltage collector and a second voltage collector; The first end of the bearing insulation test button is electrically connected to the output end of the first switch, and the bearing insulation test button is used to control the closing and opening of the bearing insulation test circuit; The first voltage collector and the second voltage collector are used to obtain bearing insulation test results.

[0009] In one embodiment, the bearing insulation test circuit further includes a second contactor; The first end of the second contactor is electrically connected to the second end of the bearing insulation test button, the second end of the second contactor is electrically connected to the first end of the first voltage collector, the second end of the second contactor is electrically connected to the first end of the second voltage collector, and the second contactor is used to control the connection and disconnection of the bearing insulation test circuit.

[0010] In one embodiment, the voltage analysis comparator comprises: The voltage analysis comparator is electrically connected to the first voltage collector, and the voltage analysis comparator is electrically connected to the second voltage collector.

[0011] In one embodiment, the online testing device further comprises a visualization device; The visualization device is used to display the shaft voltage test results and the bearing insulation test results, wherein the bearing insulation test results include one of "test error, please check the loop and grounding point" or "bearing insulation is good" or "bearing insulation is poor".

[0012] In one embodiment, the visualization device is a display screen.

[0013] In one embodiment, the online testing device is electrically connected to an alternating current power source.

[0014] In summary, the present disclosure proposes an online testing device for generator shaft voltage and bearing insulation, including: a first switch, a test circuit and a voltage analysis comparator; the first switch is closed to energize the online testing device, and the first switch is opened to power off the online testing device; the first end of the test circuit is electrically connected to the output end of the first switch, the test circuit includes a shaft voltage test circuit and a bearing insulation test circuit, and the test circuit is used to obtain shaft voltage test results and bearing insulation test results; the voltage analysis comparator is used to analyze the shaft voltage test results and the bearing insulation test results.

[0015] The solution provided by the present invention obtains shaft voltage test results and bearing insulation test results through the shaft voltage test circuit and the bearing insulation test circuit in the online test device, and analyzes the shaft voltage test results and the bearing insulation test results through a voltage analysis comparator, thereby ensuring that the two voltage values ​​are measured at the same time, reducing test errors, and solving the problem that each test requires professionals to perform, thereby directly obtaining the test results and reducing safety hazards.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description are used to explain the principles of the present disclosure, and do not constitute improper limitations on the present disclosure.

[0018] Figure 1 A schematic diagram of the structure of an online testing device for generator shaft voltage and bearing insulation provided by an embodiment of the present disclosure; Figure 2 A schematic diagram of the structure of an online testing device for generator shaft voltage and bearing insulation provided by an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the appearance and structure of the generator shaft voltage and bearing insulation online testing device provided in an embodiment of the present disclosure.

[0019] Reference numerals: The first switch 1, the voltage analysis comparator 2, the shaft voltage test button 3, the first voltage collector 4, the first contactor 5, the bearing insulation test button 6, the second voltage collector 7, and the second contactor 8. DETAILED DESCRIPTION

[0020] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0021] Combine the following Figure 2 The generator shaft voltage and bearing insulation online testing device provided by the embodiment of the present invention is described in detail.

[0022] The generator shaft voltage and bearing insulation online testing device provided by the present invention obtains the shaft voltage test result and the bearing insulation test result through the shaft voltage test circuit and the bearing insulation test circuit in the online testing device, and analyzes the shaft voltage test result and the bearing insulation test result through a voltage analysis comparator, thereby ensuring that the two voltage values ​​are measured at the same time, reducing the test error, solving the problem that each test requires professionals to perform, and reducing safety hazards while directly obtaining the test results.

[0023] like Figure 2 As shown, the generator shaft voltage and bearing insulation online testing device provided by the present invention comprises: A first switch 1, a test circuit and a voltage analysis comparator 2; The first switch 1 is closed to energize the online testing device, and the first switch is opened to de-energize the online testing device; The first end of the test circuit is electrically connected to the output end of the first switch 1, and the test circuit includes a shaft voltage test circuit and a bearing insulation test circuit, and the test circuit is used to obtain shaft voltage test results and bearing insulation test results; The voltage analysis comparator is used to analyze the shaft voltage test results and the bearing insulation test results.

[0024] In one embodiment, the online test device can be powered on and off by controlling the first switch 1, so that the online test device can be started with one button.

[0025] In one embodiment, since the test circuit includes a shaft voltage test circuit and a bearing insulation test circuit, when the first switch 1 is closed, the shaft voltage test circuit can obtain the shaft voltage, and the bearing insulation test circuit can obtain the shaft voltage and the voltage of the bearing seat to the ground. That is, the test circuit can solve the problem in the related art that the shaft voltage and the voltage of the bearing seat to the ground cannot be measured simultaneously.

[0026] In one embodiment, the shaft voltage test results and the bearing insulation test results are analyzed by the voltage analysis comparator 2, which can solve the problem in the related technology that each test result needs to be analyzed by professionals. Specifically, the voltage analysis comparator 2 can determine the shaft voltage test results and the bearing insulation test results based on the numerical values ​​of the shaft voltage and the voltage of the bearing seat to the ground obtained by the test circuit.

[0027] In one embodiment, when shaft voltage and bearing insulation tests are required, the original large shaft grounding electrode made of carbon powder brush is fixed to the permanent fixings on both sides of the generator steam excitation with a special brush holder, and is respectively introduced into the online testing device with a single-core rubber-sheathed wire with a cross-sectional area of ​​not less than 25 square millimeters.

[0028] In summary, the solution provided by the present invention obtains the shaft voltage test results and the bearing insulation test results through the shaft voltage test circuit and the bearing insulation test circuit in the online testing device, and analyzes the shaft voltage test results and the bearing insulation test results through a voltage analysis comparator, thereby ensuring that the two voltage values ​​are measured at the same time, reducing test errors, and solving the problem that each test requires professionals to perform, thereby directly obtaining the test results and reducing safety hazards.

[0029] In one embodiment, the first switch 1 is a molded case circuit breaker.

[0030] In one embodiment, the molded case circuit breaker is used for overload protection and short circuit protection of the test circuit.

[0031] In one embodiment, by using a molded case circuit breaker as the first switch 1 of the online testing device, the safety and reliability of the online testing device can be improved.

[0032] In one embodiment, the shaft voltage test circuit includes: A shaft voltage test button 3 and a first voltage collector 4; The first end of the shaft voltage test button 3 is electrically connected to the output end of the first switch 1, and the shaft voltage test button 3 is used to control the closing and opening of the shaft voltage test loop; The first end of the first voltage collector 4 is electrically connected to the second end of the shaft voltage test button 3 , and the first voltage collector 4 is used to collect shaft voltage.

[0033] In one embodiment, when the first switch 1 is closed, the shaft voltage test button 3 is pressed, and after the shaft voltage test loop is closed, the shaft voltage at both ends of the generator shaft can be collected by the first voltage collector 4 .

[0034] In one embodiment, when the first switch 1 is closed, the shaft voltage test button 3 is lifted and the shaft voltage test circuit is disconnected.

[0035] In one embodiment, since the shaft voltage usually changes when a motor fault occurs, for example, a short circuit or open circuit in the internal winding of the motor will cause the shaft voltage to decrease or disappear. Therefore, by collecting the shaft voltage at both ends of the generator shaft through the first voltage collector 4, it can be determined whether the motor has a fault. Specifically, if the shaft voltage at both ends of the generator shaft collected by the first voltage collector 4 is consistent with the motor parameters, it means that the motor is normal. If the shaft voltage at both ends of the generator shaft collected by the first voltage collector 4 is abnormal (such as low value, abnormal frequency, waveform distortion, etc.), it is necessary to check whether the motor has a fault.

[0036] In one embodiment, the shaft voltage test circuit further includes a first contactor 5; The first contactor 5 is disposed between the shaft voltage test button 3 and the first voltage collector 4 , and the first contactor 5 is used to control the closing and opening of the shaft voltage test loop.

[0037] In one embodiment, when the first switch 1 is closed, the shaft voltage test button 3 is pressed, the first contactor 5 is energized, and after the shaft voltage test circuit is closed, the shaft voltage at both ends of the generator shaft can be collected by the first voltage collector 4.

[0038] In one embodiment, when the first switch 1 is closed, the shaft voltage test button 3 is lifted, the first contactor 5 is disconnected, and the shaft voltage test circuit is disconnected.

[0039] In one embodiment, by providing a first contactor 5 between the shaft voltage test button 3 and the first voltage collector 4 , the safety and reliability of the online testing device can be further enhanced.

[0040] In one embodiment, the bearing insulation test circuit includes: A bearing insulation test button 6, a first voltage collector 4 and a second voltage collector 7; The first end of the bearing insulation test button 5 is electrically connected to the output end of the first switch 1, and the bearing insulation test button 6 is used to control the closing and opening of the bearing insulation test circuit; The first voltage collector 4 and the second voltage collector 7 are used to obtain the bearing insulation test results.

[0041] In one embodiment, the first voltage collector 4 collects the voltage at both ends of the generator shaft. In one embodiment, the second voltage collector 7 collects the voltage between the bearing seat and the ground.

[0042] In one embodiment, the bearing insulation test circuit further includes a second contactor 8; The first end of the second contactor 8 is electrically connected to the second end of the bearing insulation test button 6, the second end of the second contactor 8 is electrically connected to the first end of the first voltage collector 4, the second end of the second contactor is electrically connected to the first end of the second voltage collector 7, and the second contactor 8 is used to control the connection and disconnection of the bearing insulation test circuit.

[0043] In one embodiment, when the first switch 1 is closed, the bearing insulation test button 6 is pressed, the second contactor 8 is closed, and the bearing insulation test circuit is connected. The bearing insulation test result can be obtained through the first voltage collector 4 and the second voltage collector 7.

[0044] In one embodiment, when the first switch 1 is closed, the bearing insulation test button 6 is lifted, the second contactor 8 is disconnected, and the bearing insulation test circuit is disconnected.

[0045] In one embodiment, the voltage analysis comparator 2 comprises: The voltage analysis comparator 2 is electrically connected to the first voltage collector 4 , and the voltage analysis comparator 2 is electrically connected to the second voltage collector 7 .

[0046] In one embodiment, the voltage analysis comparator 2 and the first voltage collector 4 may be electrically connected via a wire or a cable, and the voltage analysis comparator 2 and the second voltage collector 7 may also be electrically connected via a wire or a cable, such as a data line.

[0047] In one embodiment, by electrically connecting the voltage analysis comparator 2 to the first voltage collector 4 and the voltage analysis comparator 2 to the second voltage collector 7, the data collected by the first voltage collector 4 and the second voltage collector 7 can be transferred to the voltage analysis comparator 2, and the voltage analysis comparator 2 can perform analysis and comparison of the shaft voltage test results and the bearing insulation test results, thereby eliminating the need for professional personnel to analyze the test results.

[0048] In one embodiment, the online testing device further comprises a visualization device; The visualization device is used to display the shaft voltage test results and the bearing insulation test results, wherein the bearing insulation test results include one of "test error, please check the loop and grounding point" or "bearing insulation is good" or "bearing insulation is poor".

[0049] In one embodiment, after the online testing device is installed and wired once, the test can be repeated multiple times without any safety hazards.

[0050] In one embodiment, by using a visualization device, the shaft voltage test results and the bearing insulation test results can be directly read.

[0051] In one embodiment, the visualization device is a display screen.

[0052] In one embodiment, if Figure 3 As shown, Figure 3 This is a schematic diagram of the appearance and structure of an online testing device for generator shaft voltage and bearing insulation provided in an embodiment of the present invention, wherein the voltage values ​​collected by the first voltage collector 4 and the second voltage collector 7 and the test results after analysis by the voltage analysis comparator 2 are displayed on the display screen of the online testing device.

[0053] In one embodiment, the online testing device is electrically connected to an alternating current power source.

[0054] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A generator shaft voltage and bearing insulation online testing device, characterized in that: include: The first switch, the test circuit and the voltage analysis comparator; The first switch is closed to energize the online testing device, and the first switch is opened to de-energize the online testing device; The first end of the test circuit is electrically connected to the output end of the first switch, the test circuit includes a shaft voltage test circuit and a bearing insulation test circuit, and the test circuit is used to obtain shaft voltage test results and bearing insulation test results; The voltage analysis comparator is used to analyze the shaft voltage test results and the bearing insulation test results.

2. The generator shaft voltage and bearing insulation online testing device according to claim 1 is characterized in that: The first switch is a molded case circuit breaker.

3. The generator shaft voltage and bearing insulation online testing device according to claim 1 is characterized in that: The shaft voltage test circuit comprises: Shaft voltage test button and first voltage collector; The first end of the shaft voltage test button is electrically connected to the output end of the first switch, and the shaft voltage test button is used to control the closing and opening of the shaft voltage test loop; The first end of the first voltage collector is electrically connected to the second end of the shaft voltage test button, and the first voltage collector is used to collect shaft voltage.

4. The generator shaft voltage and bearing insulation online testing device according to claim 3 is characterized in that: The shaft voltage test circuit also includes a first contactor; The first contactor is arranged between the shaft voltage test button and the first voltage collector, and the first contactor is used to control the closing and opening of the shaft voltage test loop.

5. The generator shaft voltage and bearing insulation online testing device according to claim 1 is characterized in that: The bearing insulation test circuit comprises: A bearing insulation test button, a first voltage collector and a second voltage collector; The first end of the bearing insulation test button is electrically connected to the output end of the first switch, and the bearing insulation test button is used to control the closing and opening of the bearing insulation test circuit; The first voltage collector and the second voltage collector are used to obtain bearing insulation test results.

6. The generator shaft voltage and bearing insulation online testing device according to claim 5 is characterized in that: The bearing insulation test circuit also includes a second contactor; The first end of the second contactor is electrically connected to the second end of the bearing insulation test button, the second end of the second contactor is electrically connected to the first end of the first voltage collector, the second end of the second contactor is electrically connected to the first end of the second voltage collector, and the second contactor is used to control the connection and disconnection of the bearing insulation test circuit.

7. The generator shaft voltage and bearing insulation online testing device according to claim 1 is characterized in that: The voltage analysis comparator comprises: The voltage analysis comparator is electrically connected to the first voltage collector, and the voltage analysis comparator is electrically connected to the second voltage collector.

8. The generator shaft voltage and bearing insulation online testing device according to claim 1 is characterized in that: The online testing device also includes a visualization device; The visualization device is used to display the shaft voltage test results and the bearing insulation test results, wherein the bearing insulation test results include one of "test error, please check the loop and grounding point" or "bearing insulation is good" or "bearing insulation is poor".

9. The generator shaft voltage and bearing insulation online testing device according to claim 8, characterized in that: The visualization device adopts a display screen.

10. The generator shaft voltage and bearing insulation online testing device according to claim 1, characterized in that: The online testing device is electrically connected to an AC power source.

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