Distributed optical fiber temperature measurement system for power transformer

Abstract

The utility model relates to the technical field of power transformer temperature measurement equipment, and discloses a distributed optical fiber temperature measurement system for a power transformer, which comprises a temperature sensing optical fiber arranged in the transformer, and the temperature sensing optical fiber is connected with a distributed optical fiber temperature monitoring host for temperature demodulation and data processing. The distributed optical fiber temperature monitoring host is electrically connected with a server used for receiving data and configuring parameters; according to the utility model, the timeliness and accuracy of temperature measurement of the transformer can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature measurement equipment for power transformers, in particular to a distributed optical fiber temperature measurement system for power transformers. Background Art

[0002] Power transformers are crucial electrical equipment in power systems, and their operating conditions are crucial to the safe and reliable operation of these systems. Transformer accidents are largely caused by winding overheating, which leads to insulation aging. Winding breakdown and burnout account for a significant proportion of transformer accidents.

[0003] Current transformer winding temperature measurement methods used in the power industry include thermal resistors, thermocouples, and infrared. However, windings are exposed to high voltages, high temperatures, high magnetic fields, and extremely strong electromagnetic interference. Thermal resistors and thermocouples use metal conductors to transmit signals, which can generate electromagnetic interference. Metal conductors are often immersed in oil and are prone to short circuits due to aging. Infrared sensors cannot be installed inside the transformer and can only measure surface temperature, which is easily affected by ambient temperature. Consequently, some existing transformer winding temperature measurement devices suffer from technical issues such as delayed and inaccurate temperature response. Utility Model Content

[0004] The purpose of the utility model is to provide a distributed optical fiber temperature measurement system for power transformers, which can effectively improve the timeliness and accuracy of transformer temperature measurement.

[0005] The utility model is achieved in this way:

[0006] A distributed optical fiber temperature measurement system for a power transformer includes a temperature-sensing optical fiber arranged in the transformer, wherein the temperature-sensing optical fiber is connected to a distributed optical fiber temperature monitoring host for temperature demodulation and data processing, and the distributed optical fiber temperature monitoring host is electrically connected to a server for receiving data and parameter configuration.

[0007] Furthermore, the temperature-sensitive optical fibers are respectively connected to the oil tank, windings and steel core of the transformer.

[0008] Furthermore, the temperature-sensitive optical fiber is respectively connected to the winding and steel sheet of the transformer.

[0009] Furthermore, the temperature-sensitive optical fiber is encapsulated with a polytetrafluoroethylene sheath.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] In practical applications, the temperature of the transformer is detected by temperature-sensitive optical fiber. The temperature-sensitive optical fiber is both a sensing medium and a transmission medium, and can perform temperature sensing and signal transmission functions. The temperature-sensitive optical fiber is inherently explosion-proof and electrically insulated, suitable for detection in high voltage and strong electromagnetic interference environments, and has good chemical stability; the sensor probe has a simple structure, small size, light weight, good temperature resistance, thin diameter, soft texture, and excellent operability and embeddability; it has good time domain conversion properties, is easy to measure at multiple points, and can be multiplexed on a single line to form a sensing network and array, which is convenient for wavelength division and time division multiplexing and distributed sensing, effectively improving the timeliness and accuracy of the temperature measurement system; the temperature-sensitive optical fiber transmits the detected temperature signal to the The distributed fiber optic temperature monitoring host uses the spontaneous Raman scattering and optical time domain reflection principles generated when light is transmitted in the optical fiber to obtain spatial temperature distribution information. It can shield the interference of strong electromagnetic fields, and the temperature measurement accuracy and spatial resolution can reach ±. meters, further improving the accuracy of the temperature measurement system. The distributed fiber optic temperature monitoring host performs temperature demodulation and data processing on the received scattered light signal, converts the optical signal into a digital signal, and transmits it to the server; the distributed fiber optic temperature monitoring host is configured with parameters through the server, and the temperature data is transmitted to the display for display; the utility model can effectively improve the timeliness and accuracy of transformer temperature measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 This is a schematic diagram of the layout of temperature-sensing optical fibers inside a transformer of the present invention.

[0015] Reference numerals: transformer 1; oil tank 2; winding 3; steel core 4; temperature-sensing optical fiber 5. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] See also Figure 1 and Figure 2 A distributed optical fiber temperature measurement system for a power transformer includes a temperature-sensing optical fiber 5 arranged in a transformer 1, wherein the temperature-sensing optical fiber 5 is connected to a distributed optical fiber temperature monitoring host for temperature demodulation and data processing, and the distributed optical fiber temperature monitoring host is electrically connected to a server for receiving data and parameter configuration.

[0018] In practical applications, the temperature of the transformer 1 is detected by the temperature-sensing optical fiber 5. The temperature-sensing optical fiber 5 is both a sensing medium and a transmission medium, and can perform temperature sensing and signal transmission functions. The temperature-sensing optical fiber 5 is inherently explosion-proof and electrically insulated, and is suitable for detection in high voltage and strong electromagnetic interference environments, and has good chemical stability. The sensing probe has a simple structure, small size, light weight, good temperature resistance, thin diameter, soft texture, and excellent operability and embeddability. It has good time domain conversion performance, is easy to measure at multiple points, and can be multiplexed on a single line to form a sensing network and array, which is convenient for wavelength division and time division multiplexing and distributed sensing, and effectively improves the timeliness and accuracy of the temperature measurement system. The temperature-sensing optical fiber 5 transmits the detected temperature signal to the The distributed fiber optic temperature monitoring host uses the spontaneous Raman scattering and optical time domain reflection principles generated when light is transmitted in the optical fiber to obtain spatial temperature distribution information. It can shield the interference of strong electromagnetic fields. The temperature measurement accuracy and spatial resolution can reach ±0.05 meters, further improving the accuracy of the temperature measurement system. The distributed fiber optic temperature monitoring host performs temperature demodulation and data processing on the received scattered light signal, converts the optical signal into a digital signal, and transmits it to the server; the distributed fiber optic temperature monitoring host is configured with parameters through the server, and the temperature data is transmitted to the display for display; the utility model can effectively improve the timeliness and accuracy of the temperature measurement of the transformer 1.

[0019] See also Figure 1 and Figure 2The temperature-sensing optical fiber 5 is respectively connected to the oil tank 2, winding 3 and steel core 4 of the transformer 1.

[0020] In this embodiment, the temperature-sensing optical fiber 5 is respectively in zero-degree contact with the oil tank 2, the winding 3 and the steel core 4, respectively corresponding to the detection of the upper and lower temperature distribution of the circulating heat dissipation of the oil tank 2 inside the transformer 1, the distributed temperature of the surface of the winding 3 and the heated temperature distribution of the steel core 4, thereby realizing distributed measurement instead of similarly calculating the approximate temperature. The temperature measurement carrier is accurately measured, providing real online data for analyzing the physical operating parameters in the box, and effectively improving the accuracy of temperature measurement.

[0021] See also Figure 1 and Figure 2 The temperature-sensing optical fiber 5 is respectively connected to the winding 3 and the steel sheet of the transformer 1 .

[0022] In this embodiment, the temperature-sensing optical fiber 5 is connected to the winding 3 and steel sheet of the transformer 1 respectively. It can be arranged in a coiled or encircled manner at prominent and concentrated hot spots to achieve full and comprehensive contact with the power transformer 1, monitor the temperature changes of the transformer 1 in real time and comprehensively, and further enhance the accuracy of temperature measurement.

[0023] See also Figure 1 and Figure 2 The temperature-sensitive optical fiber 5 is encapsulated with a polytetrafluoroethylene sheath.

[0024] In this embodiment, the temperature-sensitive optical fiber 5 encapsulated by the polytetrafluoroethylene sheath has the characteristics of stable performance, resistance to oil immersion, acid and alkali corrosion, bending, and good toughness, and can effectively prevent the creepage phenomenon caused by dust accumulation and moisture.

[0025] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A distributed optical fiber temperature measurement system for power transformers, characterized by: The invention comprises a temperature-sensing optical fiber (5) arranged in a transformer (1), wherein the temperature-sensing optical fiber (5) is connected to a distributed optical fiber temperature monitoring host for temperature demodulation and data processing, and the distributed optical fiber temperature monitoring host is electrically connected to a server for receiving data and parameter configuration.

2. A distributed optical fiber temperature measurement system for power transformers according to claim 1, characterized in that: The temperature-sensing optical fiber (5) is respectively connected to the oil tank (2), the winding (3) and the steel core (4) of the transformer (1).

3. A distributed optical fiber temperature measurement system for power transformers according to claim 2, characterized in that: The temperature-sensing optical fiber (5) is respectively connected in a surrounding manner to the winding (3) and the steel sheet of the transformer (1).

4. A distributed optical fiber temperature measurement system for power transformers according to claim 1, characterized in that: The temperature-sensitive optical fiber (5) is encapsulated with a polytetrafluoroethylene sheath.

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