A transformer optical fiber temperature measurement system and its measurement method

Abstract

The present invention discloses a fiber optic temperature measurement system for a transformer, which includes a number of temperature measurement blind holes opened on the transformer oil tank. The depths of different temperature measurement blind holes are different. At the top of each temperature measurement blind hole, there is a chute connected to other temperature measurement blind holes. A slider is slidably installed in the chute. A longitudinal through hole is opened on the slider, and a measuring rod is movably inserted into the through hole. A fiber optic temperature sensor is installed at the bottom of the measuring rod, and the fiber optic temperature sensor is communicatively connected to a host computer. The present invention can improve the deficiencies of the prior art, realize the rapid and accurate measurement of the overall temperature state of the oil in the transformer, and has a low hardware cost.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission and transformation, and in particular to a transformer optical fiber temperature measurement system and a measurement method thereof. Background Art

[0002] Thermal faults of transformers are common fault types during operation. Therefore, temperature monitoring during the operation of transformers is very important. Optical fiber temperature measurement is a new temperature measurement method emerging in the process of transformer temperature monitoring in recent years, with strong anti-interference ability and high sensitivity. However, since the temperature field inside the transformer oil tank fluctuates in real time, how to quickly and accurately determine the overall temperature state of the oil in the transformer has become one of the research hotspots in this field. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a transformer optical fiber temperature measurement system and a measurement method thereof, which can solve the deficiencies of the prior art, realize the rapid and accurate measurement of the overall temperature state of the oil in the transformer, and have low hardware costs.

[0004] To solve the above technical problems, the following technical solutions are adopted in the present invention.

[0005] A transformer optical fiber temperature measurement system includes a plurality of temperature measurement blind holes opened on the transformer oil tank. The depths of different temperature measurement blind holes are different. The top of each temperature measurement blind hole is provided with a chute connected to other temperature measurement blind holes. A slider is slidably installed in the chute. A longitudinal through hole is opened on the slider. A measuring rod is movably inserted into the through hole. An optical fiber temperature sensor is installed at the bottom of the measuring rod. The optical fiber temperature sensor is communicatively connected to a host computer.

[0006] Preferably, a sleeve is installed in the through hole. Two parallel clamping pieces are fixed on the outer side wall of the sleeve. Rubber sheets are fixed on both sides of the top of the chute. The rubber sheets pass through between the two clamping pieces. A sealing ring is arranged inside the sleeve. The measuring rod is in interference fit with the sealing ring.

[0007] Preferably, a lock is installed at the top of the sleeve for locking and fixing the measuring rod. The optical fiber temperature sensor is installed at the bottom of the measuring rod through a first spring.

[0008] Preferably, a protective cover is installed outside the optical fiber temperature sensor through a second spring.

[0009] A measurement method of the above-mentioned transformer optical fiber temperature measurement system includes the following steps:

[0010] A. The optical fiber temperature sensor detects the transformer oil temperature in any one of the temperature measurement blind holes in real time and uploads the detection result to the host computer;

[0011] B. The host computer analyzes the received detection results. If a situation that meets the warning conditions occurs, a warning message is sent. The warning conditions are as follows:

[0012] The detection result continuously exceeds the rated upper limit of the oil temperature for 1 minute.

[0013] Or the total time that the detection result exceeds the rated upper limit of the oil temperature within consecutive 10 minutes exceeds 70%.

[0014] Or the difference between the maximum value and the minimum value of the detection result within 1 minute exceeds 10°C.

[0015] C. When the host computer sends a warning message, use the measuring rod to lift the optical fiber temperature sensor out of the temperature measurement blind hole, and then drive the optical fiber temperature sensor to move to other temperature measurement blind holes for oil temperature detection, and upload the detection results to the host computer.

[0016] D. The host computer analyzes the received detection results. If a situation that meets the alarm conditions occurs, an alarm message is sent.

[0017] Preferably, in step B, the warning conditions are as follows:

[0018] The detection result continuously exceeds the rated upper limit of the oil temperature for 1 minute.

[0019] Or the total time that the detection result exceeds the rated upper limit of the oil temperature within consecutive 10 minutes exceeds 70%.

[0020] Or the difference between the maximum value and the minimum value of the detection result within 1 minute exceeds 10°C.

[0021] Preferably, in step D, establish the temperature measurement data curve of each temperature measurement blind hole, cluster and group the temperature measurement data curves according to the similarity between the temperature measurement data curves, use the temperature measurement data curve with the two farthest temperature measurement blind holes as the reference group, fit the temperature measurement data curve in the reference group to obtain a reference fitting curve, and fit the temperature measurement data curve in other groups to obtain a non-reference fitting curve.

[0022] When the reference fitting curve continuously exceeds the rated upper limit of the oil temperature for 1 minute and at least one non-reference fitting curve also exceeds the rated upper limit of the oil temperature simultaneously, an alarm message is sent.

[0023] The beneficial effects brought by adopting the above technical solutions are as follows: The present invention only needs to set up a set of optical fiber temperature measurement mechanisms. When a warning occurs, the overall temperature state of the oil in the transformer tank can be quickly determined through temperature measurements at different positions. The hardware investment cost for temperature measurement is low, and the temperature state determination is accurate. Description of the Drawings

[0024] Figure 1It is a layout position diagram of the temperature - measuring blind holes and the sliding grooves on the transformer oil tank in a specific embodiment of the present invention.

[0025] Figure 2 It is a structural diagram of the temperature - measuring blind hole in a specific embodiment of the present invention.

[0026] In the figure: 1. Transformer oil tank; 2. Temperature - measuring blind hole; 3. Sliding groove; 4. Slide block; 5. Through - hole; 6. Measuring rod; 7. Fiber optic temperature sensor; 8. Sleeve; 9. Clip; 10. Rubber sheet; 11. Sealing ring; 12. Lock; 13. First spring; 14. Second spring; 15. Protective cover. Specific embodiment

[0027] Refer to Figure 1-2 In a specific embodiment of the present invention, it includes a number of temperature - measuring blind holes 2 opened on the transformer oil tank 1. The depths of different temperature - measuring blind holes 2 are different. At the top of each temperature - measuring blind hole 2, there is a sliding groove 3 connected to other temperature - measuring blind holes 2. A slide block 4 is slidably installed in the sliding groove 3. A longitudinal through - hole 5 is opened on the slide block 4. A measuring rod 6 is movably inserted into the through - hole 5. A fiber optic temperature sensor 7 is installed at the bottom of the measuring rod 6. The fiber optic temperature sensor 7 is communicatively connected to a host computer (not shown in the figure). A sleeve 8 is installed in the through - hole 5. Two parallel clips 9 are fixed on the outer side wall of the sleeve 8. Rubber sheets 10 are fixed on both sides of the top of the sliding groove 3. The rubber sheets 10 pass through between the two clips 9. A sealing ring 11 is arranged inside the sleeve 8. The measuring rod 6 is in interference fit with the sealing ring 11. A lock 12 for locking and fixing the measuring rod 6 is installed at the top of the sleeve 8. The bottom of the measuring rod 6 is installed with a fiber optic temperature sensor 7 through a first spring 13. A protective cover 15 is installed outside the fiber optic temperature sensor 7 through a second spring 14.

[0028] A measuring method for the above - mentioned transformer fiber optic temperature measurement system includes the following steps:

[0029] A. The fiber optic temperature sensor 7 performs real - time detection of the transformer oil temperature in any one of the temperature - measuring blind holes 2 and uploads the detection result to the host computer;

[0030] B. The host computer analyzes the received detection result. If a situation that meets the warning condition occurs, it issues a warning message;

[0031] C. When the host computer issues a warning message, use the measuring rod 6 to lift the fiber optic temperature sensor 7 out of the temperature - measuring blind hole 2, and then drive the fiber optic temperature sensor 7 to move to other temperature - measuring blind holes 2 for oil temperature detection and upload the detection result to the host computer;

[0032] D. The host computer analyzes the received detection result. If a situation that meets the alarm condition occurs, it issues an alarm message;

[0033] Establish the temperature measurement data curve for each temperature measurement blind hole 2, cluster and group the temperature measurement data curves according to the similarity between the temperature measurement data curves, take the temperature measurement data curve with the two farthest temperature measurement blind holes 2 as the reference group, fit the temperature measurement data curve in the reference group to obtain a reference fitting curve, and fit the temperature measurement data curve in other groups to obtain a non-reference fitting curve;

[0034] When the reference fitting curve continuously exceeds the rated upper limit of the oil temperature for 1 minute and at least one non-reference fitting curve also exceeds the rated upper limit of the oil temperature, an alarm message is issued.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A transformer optical fiber temperature measurement system, characterized in that: It includes a number of temperature-measuring blind holes (2) opened on a transformer oil tank (1). The depths of different temperature-measuring blind holes (2) are different. A chute (3) connected to other temperature-measuring blind holes (2) is provided at the top of each temperature-measuring blind hole (2). A slider (4) is slidably installed in the chute (3). A longitudinal through hole (5) is opened on the slider (4). A measuring rod (6) is movably inserted into the through hole (5). An optical fiber temperature sensor (7) is installed at the bottom of the measuring rod (6). The optical fiber temperature sensor (7) is communicatively connected to a host computer. A sleeve (8) is installed in the through hole (5). Two parallel clamping pieces (9) are fixed on the outer side wall of the sleeve (8). Rubber sheets (10) are fixed on both sides of the top of the chute (3). The rubber sheets (10) pass through between the two clamping pieces (9). A sealing ring (11) is arranged inside the sleeve (8). The measuring rod (6) is in interference fit with the sealing ring (11). A lock (12) for locking and fixing the measuring rod (6) is installed at the top of the sleeve (8). The optical fiber temperature sensor (7) is installed at the bottom of the measuring rod (6) through a first spring (13).

2. The transformer optical fiber temperature measurement system according to claim 1, wherein: A protective cover (15) is installed outside the optical fiber temperature sensor (7) through a second spring (14).

3. A measurement method for the transformer optical fiber temperature measurement system according to any one of claims 1-2, characterized in that It includes the following steps: A. The optical fiber temperature sensor (7) performs real-time detection of the transformer oil temperature in any one of the temperature-measuring blind holes (2) and uploads the detection result to the host computer. B. The host computer analyzes the received detection result. If a situation that meets the warning condition occurs, a warning message is sent. C. When the host computer sends a warning message, the measuring rod (6) is used to lift the optical fiber temperature sensor (7) out of the temperature-measuring blind hole (2), and then the optical fiber temperature sensor (7) is driven to move to other temperature-measuring blind holes (2) for oil temperature detection, and the detection result is uploaded to the host computer. D. The host computer analyzes the received detection result. If a situation that meets the alarm condition occurs, an alarm message is sent.

4. The measuring method of the transformer optical fiber temperature measurement system according to claim 3, characterized in that: In step B, the warning condition is that the detection result continuously exceeds the rated upper limit of the oil temperature for 1 min, or the total time that the detection result exceeds the rated upper limit of the oil temperature within 10 consecutive minutes exceeds 70%, or the difference between the maximum value and the minimum value of the detection result within 1 min exceeds 10°C.

5. The measuring method of the transformer optical fiber temperature measurement system according to claim 4, characterized in that: In step D, a temperature measurement data curve of each temperature-measuring blind hole (2) is established. The temperature measurement data curves are clustered and grouped according to the similarity between the temperature measurement data curves. The temperature measurement data curve with the two farthest temperature-measuring blind holes (2) is used as a reference group. The temperature measurement data curve in the reference group is fitted to obtain a reference fitting curve. The temperature measurement data curves in other groups are fitted to obtain non-reference fitting curves. When the reference fitting curve continuously exceeds the rated upper limit of the oil temperature for 1 min and at least one non-reference fitting curve also exceeds the rated upper limit of the oil temperature at the same time, an alarm message is sent.

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