CN204944663U - The transformer winding vibration measurement mechanism that transformer Intruding wave causes - Google Patents

Abstract

The utility model relates to a transformer winding vibration measurement device caused by intrusive waves of transformers, comprising: a broadband light source, a circulator, several fiber Bragg gratings, an array waveguide grating and a photoelectric detector; the broadband light source is connected to the circulator, and each fiber Bragg grating is sequentially Connection, the circulator is connected to the first fiber Bragg grating, the arrayed waveguide grating is respectively connected to the circulator and the photodetector, and the photodetector is fixed on the winding of the transformer under test; the broadband optical signal sent by the broadband light source passes through the circulator and is divided into multiple The narrow-band optical signal enters the fiber Bragg grating respectively, and enters the arrayed waveguide grating after being reflected by the fiber Bragg grating; the photodetector receives the narrow-band optical signal in the arrayed waveguide grating and converts it into a corresponding voltage signal; A detector records changes in the voltage signal. The vibration condition of the transformer winding measured by the utility model is not easily affected by electromagnetic interference, and can measure vibration signals of multiple points at the same time.

Description

Transformer Winding Vibration Measuring Device Caused by Transformer Intrusion Wave

technical field

The utility model relates to the technical field of electric power, in particular to a transformer winding vibration measurement device caused by transformer intrusion waves.

Background technique

Power grid equipment accidents occur frequently, including a large number of unexpected equipment insulation accidents without symptoms, and the cumulative effect of intrusive waves on substation equipment is one of the important reasons for equipment insulation degradation and sudden accidents. In order to accurately assess the hazards of intrusive waves to the insulation of substation equipment and reduce the risk of unforeseen equipment accidents to the safe operation of the power grid, it is necessary to carry out experimental research in the laboratory to master the typical insulation under the impact of multiple intrusive waves. Vibration of structural materials, insulation damage, and insulation capacity decline, to obtain the damage rule of equipment insulation caused by the accumulation of intrusive waves. Therefore, it is necessary to measure the vibration of transformer windings caused by transformer intrusion waves.

Traditionally, there are two main methods for detecting vibration signals of transformer windings caused by intrusive waves of transformers. One is to use a piezoelectric sensor, which couples the piezoelectric sensing probe to the transformer winding under test with a couplant. The piezoelectric effect converts the received vibration signal into a voltage signal and measures it, so as to achieve the purpose of detecting vibration. The other is to use Fiber Bragg Grating (Fiber BraggGrating, FBG) vibration measurement. The light source is a narrow-band light source, which adopts a time-division multiplexing method. By adjusting the output wavelength of the narrow-band light source, the vibration measurement at multiple Fiber Bragg Gratings is realized;

The above-mentioned first technology, the piezoelectric sensor is susceptible to electromagnetic interference, and the measurement results are easily disturbed under the impact of the intrusive wave. At the same time, due to the influence of factors such as volume and quality, it is difficult to use in the narrow environment of the transformer, and the detection sensitivity Not high enough to bring a lot of inconvenience to the application. For the second technique, for the measurement of the vibration caused by the intrusive wave of the transformer winding, the time of the intrusive wave is on the order of microseconds. Therefore, the vibration of all test points cannot be grasped at the same time by means of time-division multiplexing.

Utility model content

Based on this, it is necessary to provide a transformer winding vibration measurement device caused by transformer intrusion waves in view of the problems that the traditional detection method of transformer winding vibration signals caused by transformer intrusion waves is susceptible to electromagnetic interference and limited test points.

A transformer winding vibration measurement device caused by transformer intrusion waves, including: a broadband light source, a circulator, several fiber Bragg gratings, arrayed waveguide gratings and photodetectors;

The broadband light source is connected to the circulator, each fiber Bragg grating is connected in turn, the circulator is connected to the first fiber Bragg grating, and the arrayed waveguide grating is respectively connected to the circulator and the photodetector, and the photodetector is fixed on On the transformer winding under test;

The broadband optical signal sent by the broadband light source is divided into a plurality of narrowband optical signals after passing through the circulator, and the narrowband optical signals respectively enter into each fiber Bragg grating; after being reflected by the fiber Bragg grating, the narrowband optical signal enters the array In the waveguide grating; the photodetector receives the narrow-band optical signal in the arrayed waveguide grating and converts it into a corresponding voltage signal; the photodetector records the change of the voltage signal.

The transformer winding vibration measurement device caused by the transformer intrusion wave mentioned above measures the vibration signal of the transformer winding caused by the transformer intrusion wave by introducing a fiber grating. Since the frequency of the general electromagnetic radiation is much lower than that of the light wave, the optical signal transmitted in the optical fiber is not easily affected by electromagnetic interference. Therefore, the measured vibration of the transformer winding is not easily affected by electromagnetic interference; in addition, by using a broadband light source, the circulator divides the broadband optical signal emitted by the broadband light source into multiple narrowband optical signals, and sends them to each In the fiber Bragg grating, after the reflection of the fiber Bragg grating, the reflection spectrum of the narrowband optical signal presents multiple reflection wavelengths. Under the action of the wavelength division multiplexer, the wavelength division multiplexing is performed according to the wavelength, so that the vibration signals of multiple test points of the transformer winding can be measured by arranging multiple measurement grid areas for different parameters on one optical fiber.

Description of drawings

Fig. 1 is the structural representation of the transformer winding vibration measuring device of an embodiment;

Fig. 2 is a working principle diagram corresponding to the transformer winding vibration measuring device in Fig. 1;

Fig. 3 is a working principle diagram of a transformer winding vibration measuring device of another embodiment.

detailed description

In order to further explain the technical means adopted by the utility model and the achieved effects, the technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments.

As shown in Figure 1, it is a schematic structural diagram of a transformer winding vibration measurement device of an embodiment, a transformer winding vibration measurement device caused by transformer intrusive waves, including: a broadband light source, a circulator, several fiber Bragg gratings, arrayed waveguide gratings and photodetectors;

The broadband light source is connected to the circulator, each fiber Bragg grating is connected in turn, the circulator is connected to the first fiber Bragg grating, and the arrayed waveguide grating is respectively connected to the circulator and the photodetector, and the photodetector is fixed on On the transformer winding under test;

The broadband optical signal sent by the broadband light source is divided into a plurality of narrowband optical signals after passing through the circulator, and the narrowband optical signals respectively enter into each fiber Bragg grating; after being reflected by the fiber Bragg grating, the narrowband optical signal enters the array In the waveguide grating; the photodetector receives the narrow-band optical signal in the arrayed waveguide grating and converts it into a corresponding voltage signal; the photodetector records the change of the voltage signal.

As shown in Figure 2, it is the corresponding working principle diagram of the transformer winding vibration measurement device in Figure 1. The broadband optical signal sent by the broadband light source is divided into multiple narrowband optical signals after passing through the circulator, and the narrowband optical signals enter the fiber Bragg grating respectively. The narrow-band optical signal enters the arrayed waveguide grating after being reflected by several fiber Bragg gratings; the photodetector receives the narrow-band optical signal in the arrayed waveguide grating and converts it into a corresponding voltage signal; the photodetector records the voltage signal Variety.

When the fiber Bragg grating receives the vibration signal of the transformer winding, the wavelength of the fiber Bragg grating changes, which in turn causes the optical power passing through the arrayed waveguide grating to change. Therefore, by recording the change of the voltage signal of the photodetector, the transformer winding The vibration signal is measured.

The setting of the array wavelength parameters in the arrayed waveguide grating partly overlaps with the reflection spectrum of the fiber Bragg grating. After passing through the arrayed waveguide grating, the narrowband optical signal is multiplexed according to the wavelength and converted into a voltage signal after passing through the photodetector. The photodetector records The change of the voltage signal, the change of the voltage signal reflects the change of the vibration signal of the transformer winding, thus realizing the measurement of the vibration signal of the transformer winding caused by the intrusive wave of the transformer.

Due to the wavelength division multiplexing function of the arrayed waveguide grating in the utility model, multiple measurement grid areas can be arranged on the same optical fiber for different parameters, so as to realize the monitoring of quasi-distributed real-time vibration signals; The measurement also further improves the measurement speed of the transformer winding vibration signal caused by the transformer intrusion wave.

As an example, fiber Bragg gratings and arrayed waveguide gratings can be placed outside the test hall, thus ensuring that the measurement results will not be affected by transient shocks.

In one of the embodiments, the number of photodetectors can also be multiple, and each photodetector is fixed on a test point of the transformer winding under test for measuring the vibration signal on the corresponding test point, thereby realizing Simultaneous measurement of multiple vibration signals of transformer windings induced by transformer intrusion waves.

In one of the embodiments, the length of the fiber Bragg grating is 12mm, and the length of 12mm is beneficial to the detection of ultrasonic signals of a specific frequency.

In one of the embodiments, in order to ensure the vibration transmission efficiency of the transformer winding vibration signal caused by the intrusive wave of the transformer, the fiber Bragg grating is glued to the corresponding test point of the transformer winding. It should be noted that the glue used should be Glue for strain transfer and paste should be as thin as possible, so that the strain transfer efficiency is high, such as M-Bond610.

As shown in Figure 3, it is a working principle diagram of a transformer winding vibration measurement device in another embodiment. The transformer winding vibration measurement device caused by transformer intrusion waves of the present invention may also include: a high-pass filter connected behind the photoelectric detector to remove the effects of DC bias caused by temperature changes.

Generally, transformer windings will inevitably be affected by temperature during long-term work, and changes in temperature will cause changes in DC bias. In order to eliminate the influence of DC bias on the measurement results of vibration signals, a Access high pass filter.

In one of the embodiments, the transformer winding vibration measurement device caused by the transformer intrusion wave of the present invention may further include: an amplifier connected between the photodetector and the high-pass filter for amplifying the measured vibration signal.

Since the vibration of the transformer winding caused by the transformer intrusion wave is a transient process, an amplifier can be connected between the photodetector and the high-pass filter to further amplify the vibration signal of the transformer winding under test, which is convenient for accurate measurement of the vibration signal of the transformer winding.

Combining the transformer winding vibration measurement device caused by the transformer intrusion wave of the above-mentioned embodiments, the transformer winding vibration signal caused by the transformer intrusion wave is measured by introducing an optical fiber grating. Since the frequency of the general electromagnetic radiation is much lower than that of the light wave, the optical signal transmitted in the optical fiber It is not easily affected by electromagnetic interference, therefore, the vibration of the transformer winding measured by the utility model is not easily affected by electromagnetic interference; in addition, the utility model uses a broadband light source, and the broadband optical signal sent by the broadband light source is transmitted through a circulator It is divided into multiple narrow-band optical signals and sent to each fiber Bragg grating respectively. After being reflected by multiple fiber Bragg gratings, the reflection spectrum of the narrow-band optical signal presents multiple reflection wavelengths. The array wavelength parameter setting of the array waveguide grating and The reflection spectrum of the fiber Bragg grating is partially mixed. After passing through the arrayed waveguide grating, the narrowband optical signal is wavelength-division multiplexed according to the wavelength under the action of the wavelength division multiplexer. The parameter measurement grid area realizes the monitoring of quasi-distributed real-time vibration signals; the number of photodetectors can also be multiple, and each photodetector is fixed on a test point of the transformer winding under test for measuring the test The vibration signal on the point, because multiple measurement points are measured at the same time, the measurement speed of the vibration signal of the transformer winding caused by the transformer intrusion wave is further improved; the fiber Bragg grating is pasted to the corresponding test point of the transformer winding by glue, Ensure the vibration transmission efficiency of the transformer winding vibration signal; the high-pass filter connected after the photodetector can eliminate the influence of DC bias caused by temperature changes; the amplifier connected between the photodetector and the high-pass filter can amplify the The measurement of vibration signals is beneficial to the accurate measurement of vibration signals of transformer windings caused by transformer intrusion waves.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (7)

1. A transformer winding vibration measurement device caused by a transformer intrusion wave, characterized in that it comprises: a broadband light source, a circulator, several fiber Bragg gratings, arrayed waveguide gratings and photodetectors; The broadband light source is connected to the circulator, each fiber Bragg grating is connected in turn, the circulator is connected to the first fiber Bragg grating, and the arrayed waveguide grating is respectively connected to the circulator and the photodetector, and the photodetector is fixed on On the transformer winding under test; The broadband optical signal sent by the broadband light source is divided into a plurality of narrowband optical signals after passing through the circulator, and the narrowband optical signals respectively enter into each fiber Bragg grating; after being reflected by the fiber Bragg grating, the narrowband optical signal enters the array In the waveguide grating; the photodetector receives the narrow-band optical signal in the arrayed waveguide grating and converts it into a corresponding voltage signal; the photodetector records the change of the voltage signal. 2 . The transformer winding vibration measurement device caused by transformer intrusion waves according to claim 1 , wherein the arrayed waveguide grating is connected to the photodetector through a wavelength division multiplexer. 3 . 3. The transformer winding vibration measurement device caused by transformer intrusion waves according to claim 1 or 2, characterized in that: the number of said photodetectors is multiple, and each photodetector is fixed on the transformer winding under test. One test point is used to measure the vibration signal on the corresponding test point. 4. The transformer winding vibration measuring device caused by transformer intrusive waves according to claim 1, characterized in that: the length of the fiber Bragg grating is 12mm. 5. The transformer winding vibration measuring device caused by transformer intrusive waves according to claim 1, characterized in that: the fiber Bragg grating is pasted to the corresponding test point on the transformer winding by means of glue. 6. The transformer winding vibration measurement device caused by transformer intrusion waves according to claim 1, further comprising: a high-pass filter connected to the photodetector for eliminating the influence of DC bias caused by temperature changes . 7. The transformer winding vibration measurement device caused by transformer intrusion waves according to claim 6, further comprising: an amplifier connected between the photodetector and the high-pass filter for amplifying the measured vibration signal.