CN214503795U - Generator stator partial discharge fault positioning device based on ultrasonic measurement optical fiber transmission - Google Patents
Generator stator partial discharge fault positioning device based on ultrasonic measurement optical fiber transmission Download PDFInfo
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- CN214503795U CN214503795U CN202022700336.2U CN202022700336U CN214503795U CN 214503795 U CN214503795 U CN 214503795U CN 202022700336 U CN202022700336 U CN 202022700336U CN 214503795 U CN214503795 U CN 214503795U
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Abstract
The utility model discloses a fault location device is put in generator stator office based on transmission of ultrasonic measurement optical fiber, put the host computer including flexible composite detector, signal processing circuit, extension rod, optic fibre and office, flexible composite detector includes ultrasonic detection probe, coupling hose and aviation plug, ultrasonic detection probe aims at the generator stator that awaits measuring, and ultrasonic detection surveys and is connected with the aviation plug through coupling hose, the aviation plug is connected with signal processing circuit's signal reception port, and signal processing circuit's signal output port is put the host computer through optic fibre and office and is connected, signal processing circuit fixes at an tip of extension rod; the utility model has the advantages that: the partial discharge fault location of the generator stator is more accurate.
Description
Technical Field
The utility model relates to an experimental detection area of electrical equipment, more specifically relate to fault location device is put in generator stator office based on ultrasonic measurement optical fiber transmission.
Background
Partial discharge is very closely related to deterioration and breakdown of insulation. The generator insulation medium is subjected to the influences of heat, electricity, mechanical stress and environment for a long time, so that insulation is degraded, partial discharge occurs in the insulation when the generator operates, and the partial discharge is a sign of insulation degradation. Meanwhile, partial discharge can also play a role in accelerating degradation of generator insulation, and if the partial discharge continues to expand and develop, the insulation is finally damaged. Therefore, the insulation of the generator is measured, and one of the criteria for evaluating the quality of the generator is the partial discharge amount and the characteristic parameters thereof. By measuring the partial discharge condition in the generator, whether the conditions of winding end pollution, slot wedge looseness, insulation stripping, surface sheath damage and the like exist or not can be determined, so that corresponding measures are taken and corresponding basis is provided for the service life prediction of the motor.
Therefore, the method has very important significance for the overall insulation condition evaluation and the service life prediction of the generator for the accurate measurement and the accurate positioning of the partial discharge of the generator stator.
Research over the years worldwide has shown that the number, amplitude and polarity of partial discharge signals can directly reflect the condition of the motor insulation system. The evaluation of the insulation life of an electric machine by using the partial discharge phenomenon is still a leading discipline which is closely combined with the basic theory and the application technology in development. At present, the testing methods for the partial discharge of the generator stator at home and abroad are mainly divided into an off-line testing method and an on-line monitoring method.
(1) The off-line detection method comprises the following steps: the off-line detection of the partial discharge test of the generator stator winding belongs to the special test of the generator and is generally carried out as a sub-part of the insulation aging identification test of the generator stator winding. According to the specification of DL/T49 'testing period for insulation aging test of epoxy mica stator winding of generator': (a) long running time (generally, the running time is more than 20 years), (b) insulation breakdown occurs for a plurality of times in running or preventive tests or when necessary, (c) online partial discharge data shows that the insulation of the stator winding has aging characteristics such as layering. It can be seen that the stator partial discharge test has a long development period, and is generally developed once in a long time.
The generator stator winding partial discharge off-line test generally adopts a single-wire rod measurement or phase alignment measurement method, the test loop schematic diagram is shown in fig. 1 and fig. 2, and the test principle is that a non-partial discharge high-voltage power supply is adopted to add a tested product to a target voltage, and the partial discharge amount of the tested product at the target voltage is read.
The off-line testing method for the partial discharge of the generator stator has the advantages of accurate test data (the partial discharge noise of the generator in an off-line state is low), lower test cost (test equipment only uses a common partial discharge-free high-voltage power supply and a partial discharge measurement system), no need of additionally purchasing equipment and the like, but also has the following defects: (1) based on the existing capacitive coupling type partial discharge measuring device, the test result is easy to be interfered by electromagnetic waves and is influenced; (2) for the assembled generator equipment, the local discharge test of the whole-phase winding can be generally carried out, once the test result shows that the local discharge exceeds the standard, the fault can be positioned to a certain phase, and the fault can not be further positioned on a single bar and a smaller range.
(2) The online monitoring method comprises the following steps: the method for monitoring the partial discharge of the generator stator on line is related research carried out by foreign institutions in the first 50 th century. At present, various technologies have been successfully applied to the partial discharge detection of the motor abroad, and the following methods mainly exist: a neutral point coupling monitoring method, a portable capacitance coupling monitoring method, a stator slot coupler monitoring method, a radio frequency monitoring method and the like. The existing online monitoring methods all have the following disadvantages: (1) the cost is high, a special online monitoring device is required to be installed, such as a stator slot coupler monitoring method, a special device is required to be embedded below a slot wedge of each slot of a stator, and the stator winding needs to be modified for the generator which is put into operation, so that the method is often unacceptable for a power plant; (2) the interference signal and the internal discharge signal are difficult to distinguish, and the sensitivity is not enough; (3) the method is the same as the existing offline testing method, the accuracy level of the local discharge fault positioning is not enough, and the local discharge fault positioning can only be positioned to a certain phase or a certain groove, so that more accurate positioning can not be carried out.
In conclusion, the existing detection means in the industry are difficult to accurately position the partial discharge of the generator stator.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the fault location device is difficult to realize the problem of comparatively accurate fault location is put in generator stator office.
The utility model discloses a following technical means realizes solving above-mentioned technical problem: fault location device is put in generator stator office based on transmission of ultrasonic measurement optical fiber, put the host computer including flexible composite detector, signal processing circuit, extension rod, optic fibre and office, flexible composite detector includes ultrasonic detection probe, coupling hose and aviation plug, ultrasonic detection probe aligns the generator stator who waits to detect, and ultrasonic detection surveys through coupling hose and aviation plug connection, aviation plug is connected with signal processing circuit's signal reception port, and signal processing circuit's signal output port passes through optic fibre and the office is put the host computer and is connected, signal processing circuit fixes an tip of extension rod.
The utility model discloses an ultrasonic detection probe aims at the generator stator who waits to detect, and ultrasonic detection surveys through coupling hose and aviation plug connection, the aviation plug is connected with signal processing circuit's signal reception port, and signal processing circuit's signal output port is put the host computer through optic fibre and office and is connected, and signal processing circuit fixes a tip of extension rod, the operator directly hands the extension rod like this and can aim at the generator stator who waits to detect, detects the condition of discharging of single stator, and prior art is a certain looks of location generator, compares prior art and has higher positioning accuracy.
Further, when the voltage of the generator is less than 10KV, the ultrasonic detection probe directly contacts with the stator of the generator to be detected, and when the voltage of the generator is more than or equal to 10KV, the end part of the ultrasonic detection probe is 5-10cm away from the stator of the generator to be detected.
Further, the measurement range of the ultrasonic detection probe is-7 dB mu V to 68dB mu V.
Further, the resolution of the ultrasonic detection probe is 1 dB.
Furthermore, the extension rod is a telescopic insulating rod, and the insulating strength is 100 KV.
Further, the signal processing circuit is an ultrasonic transducer.
Further, the partial discharge host is a wave recorder or an oscilloscope.
The utility model has the advantages that:
(1) the utility model discloses an ultrasonic detection probe aims at the generator stator who waits to detect, and ultrasonic detection surveys through coupling hose and aviation plug connection, the aviation plug is connected with signal processing circuit's signal reception port, and signal processing circuit's signal output port is put the host computer through optic fibre and office and is connected, and signal processing circuit fixes a tip of extension rod, the operator directly hands the extension rod like this and can aim at the generator stator who waits to detect, detects the condition of discharging of single stator, and prior art is a certain looks of location generator, compares prior art and has higher positioning accuracy.
(2) One end of the transmission optical fiber is connected with the signal processing circuit, the other end of the transmission optical fiber is connected with the partial discharge host, and electromagnetic interference can be effectively avoided by adopting optical fiber transmission, so that the accuracy of test data is ensured.
Drawings
FIG. 1 is a schematic diagram of a prior art single bar partial discharge test loop;
FIG. 2 is a schematic diagram of a phase winding partial discharge test loop of the prior art;
fig. 3 is a schematic structural diagram of a generator stator partial discharge fault location device based on ultrasonic measurement optical fiber transmission according to an embodiment of the present invention;
FIG. 4 is the embodiment of the utility model discloses a generator stator partial discharge fault location device's experimental sketch map based on transmission of ultrasonic measurement optical fiber
Fig. 5 is a schematic cross-sectional view of a generator stator in the generator stator partial discharge fault location device based on ultrasonic measurement optical fiber transmission disclosed in the embodiment of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 3, the generator stator partial discharge fault positioning device based on ultrasonic measurement optical fiber transmission includes a flexible composite detector 1, a signal processing circuit 2, an extension rod 3, an optical fiber 4, and a partial discharge host 5. The flexible composite detector 1 and the signal processing circuit 2 are flexibly connected, can change directions at will and aim at partial discharge positions, and is convenient to use and safe and reliable to operate.
The flexible composite detector 1 comprises an ultrasonic detection probe 101, a connecting hose 102 and an aviation plug (not shown), the ultrasonic detection probe 101 is aligned to a generator stator 6 to be detected, ultrasonic detection is connected with the aviation plug through the connecting hose 102, the aviation plug is connected with a signal receiving port of a signal processing circuit 2, a signal output port of the signal processing circuit 2 is connected with a partial discharge host 5 through an optical fiber 4, electromagnetic interference can be effectively avoided by adopting optical fiber 4 for transmission, the accuracy of test data is ensured, and the signal processing circuit 2 is fixed at one end of an extension rod 3. When the voltage of the generator is less than 10KV, the ultrasonic detection probe 101 is directly contacted with the stator 6 of the generator to be detected, and when the voltage of the generator is more than or equal to 10KV, the distance between the end part of the ultrasonic detection probe 101 and the stator of the generator to be detected is 65-10 cm. The measurement range of the ultrasonic detection probe 101 is-7 dB muV to 68dB muV. The resolution of the ultrasonic detection probe 101 is 1 dB. The ultrasonic signal measurement parameters are shown in table 1.
TABLE 1 ultrasonic Signal measurement parameters
| Measurement range: | -7dB μ V to 68dB μ V |
| Resolution ratio: | 1dB |
| precision: | ±1dB |
| sensor sensitivity: | -65dB |
| sensor center frequency: | 40kHz |
| diameter of the sensor: | 8mm |
the signal processing circuit 2 is responsible for converting the acquired ultrasonic signals into electric signals, and the signal processing circuit 2 is an ultrasonic transducer in the embodiment.
The extension rod 3 is a telescopic insulating rod, the insulating strength is 100KV, and the requirement that detection personnel scan and measure the winding of the generator stator 6 is met.
In this embodiment, the partial discharge host 5 is a wave recorder or an oscilloscope, and determines whether a partial discharge phenomenon occurs according to a change of a waveform.
As shown in fig. 4, the utility model provides a generator stator partial discharge fault location device's test process as follows:
(1) numbering 6 bars of a generator stator according to the clockwise direction, and measuring and recording the length of the stator bars;
(2) three-phase boosting of generator A, B, C to a target voltage (typically U) using a non-partial discharge power supplymOr
)；
(3) After the testing device is assembled, a tester holds the extension rod 3 by hand, scanning measurement is sequentially performed on each stator bar, namely the stator of the generator to be tested, after the measurement is completed, the recorded data are analyzed, a schematic diagram of the partial discharge quantity and the position of the stator bar can be formed, so that the accurate position of a discharge point can be determined, the schematic diagram of the section of the stator of the generator is shown in fig. 5, and A, B, C in the schematic diagram respectively shows the positions of A, B, C three-phase interfaces of the generator.
The utility model discloses an ultrasonic detection probe 101 is aimed at and is waited the generator stator 6 who waits to detect, and ultrasonic detection surveys through coupling hose 102 and aviation plug connection, aviation plug is connected with signal processing circuit 2's signal reception port, and signal processing circuit 2's signal output port passes through optic fibre 4 and is put host computer 5 with the office and be connected, and signal processing circuit 2 fixes a tip of extension rod 3, the operator directly holds extension rod 3 like this and can aim at the generator stator 6 who waits to detect, detects the condition of discharging of single stator, and prior art is a certain looks of fixing a position the generator, compares prior art and has higher positioning accuracy.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. The generator stator partial discharge fault positioning device based on ultrasonic measurement optical fiber transmission is characterized by comprising a flexible composite detector, a signal processing circuit, an extension rod, an optical fiber and a partial discharge host, wherein the flexible composite detector comprises an ultrasonic detection probe, a connecting hose and an aviation plug, the ultrasonic detection probe is aligned to a generator stator to be detected, the ultrasonic detection probe is connected with the aviation plug through the connecting hose, the aviation plug is connected with a signal receiving port of the signal processing circuit, a signal output port of the signal processing circuit is connected with the partial discharge host through the optical fiber, and the signal processing circuit is fixed at one end of the extension rod.
2. The partial discharge fault location device for the stator of the generator based on the ultrasonic measurement optical fiber transmission according to claim 1, wherein when the voltage of the generator is less than 10KV, the ultrasonic detection probe directly contacts with the stator of the generator to be tested, and when the voltage of the generator is greater than or equal to 10KV, the end of the ultrasonic detection probe is 5-10cm away from the stator of the generator to be tested.
3. The partial discharge fault location device for the stator of the generator based on the ultrasonic measurement optical fiber transmission is characterized in that the measurement range of the ultrasonic detection probe is-7 dB μ V to 68dB μ V.
4. The partial discharge fault location device for the stator of the generator based on the ultrasonic measurement optical fiber transmission is characterized in that the resolution of the ultrasonic detection probe is 1 dB.
5. The partial discharge fault location device for the stator of the generator based on the ultrasonic measurement optical fiber transmission is characterized in that the extension rod is a telescopic insulating rod, and the insulating strength is 100 KV.
6. The partial discharge fault location device for the stator of the generator based on the ultrasonic measurement optical fiber transmission is characterized in that the signal processing circuit is an ultrasonic transducer.
7. The ultrasonic measurement optical fiber transmission-based generator stator partial discharge fault location device of claim 1, wherein the partial discharge host is a wave recorder or an oscilloscope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022700336.2U CN214503795U (en) | 2020-11-19 | 2020-11-19 | Generator stator partial discharge fault positioning device based on ultrasonic measurement optical fiber transmission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022700336.2U CN214503795U (en) | 2020-11-19 | 2020-11-19 | Generator stator partial discharge fault positioning device based on ultrasonic measurement optical fiber transmission |
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| CN214503795U true CN214503795U (en) | 2021-10-26 |
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| CN202022700336.2U Active CN214503795U (en) | 2020-11-19 | 2020-11-19 | Generator stator partial discharge fault positioning device based on ultrasonic measurement optical fiber transmission |
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