Automatic temperature measurement and early warning system for power equipment of transformer substation

Abstract

The invention discloses an automatic temperature measurement and early warning system for power equipment of a transformer substation, which comprises the transformer substation, a fiber bragg grating modem connected with an optical fiber, a gear box wound on the transformer substation through the optical fiber, a generator, a converter, an inverter and the outer surface of a switch cabinet, the gearbox, the generator, the converter, the inverter and the switch cabinet are respectively subjected to temperature measurement through optical fibers during working, the optical fiber grating modulation-demodulation instrument is arranged, the optical fibers are wound on the gearbox, the generator, the converter, the inverter and the switch cabinet, the temperature is monitored in real time, the management level of key equipment is improved, and the fault probability of the equipment is reduced; the radiation intensity meter and the environment temperature and humidity sensor are used for detecting the solar radiation, temperature and humidity of the transformer substation, so that the false alarm rate is reduced; the input power and the output power of the equipment during operation are acquired through the SCADA server, and early warning analysis is carried out, so that a progressive fault can be predicted.

Description

Technical Field

[0001] The present invention relates to the field of intelligent monitoring of electric power equipment, and in particular to an automatic temperature measurement and early warning system for electric power equipment in a substation. Background Art

[0002] As a crucial component of the power system, the safe and stable operation of substations is crucial to the overall system. Within substations, power equipment operates over extended periods of time, susceptible to temperature anomalies due to factors such as the thermal effects of current flow and equipment aging. Excessive equipment temperatures can degrade performance or even cause failure, severely impacting the normal operation of the entire power system. Therefore, an automatic temperature measurement and early warning system for substation power equipment is essential for temperature monitoring and early warning.

[0003] The prior art publication number is: CN103683499A, which is a remote infrared automatic temperature measurement and early warning system for power equipment in a substation. It includes an electrical equipment inspection and monitoring part and a monitoring signal processing and early warning part. The electrical equipment inspection and monitoring part includes an inspection route guide rail and an infrared temperature measuring device. The monitoring signal processing and early warning part is composed of a computer and an audible and visual alarm device. The electrical equipment inspection and monitoring part and the monitoring signal processing and early warning part are connected via wireless signals. The system can automatically monitor the temperature rise of electrical equipment in the substation in real time around the clock and process them in a timely manner. At the same time, the computer can analyze and judge the aging or defects of the equipment and prepare an equipment maintenance plan, thereby realizing the automation of the management of electrical equipment in the substation, reliably ensuring the normal operation of the substation, avoiding non-load voltage, and improving the efficiency of power supply.

[0004] The above-mentioned disclosed technical solution still has the following deficiencies: the types of substation equipment are diverse, and it is difficult to uniformly manage the temperature monitoring of different structures such as gearboxes, generators, converters, inverters, switch cabinets, etc. through infrared temperature measuring devices, and a single temperature threshold alarm cannot distinguish whether the temperature rise of the equipment is caused by environmental factors (such as radiation intensity), and the false alarm rate is high; there is a lack of correlation analysis with input power and output power, and it is difficult to predict progressive failures. Summary of the Invention

[0005] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides an automatic temperature measurement and early warning system for power equipment in a substation.

[0006] The present invention is implemented by constructing an automatic temperature measurement and early warning system for power equipment in a substation. The device includes a substation and a fiber optic Bragg grating (FBG) modem. The fiber optic Bragg grating (FBG) modem is connected to an optical fiber that is wrapped around the outer surfaces of the gearbox, generator, converter, inverter, and switchgear in the substation. The optical fiber measures the temperature of the gearbox, generator, converter, inverter, and switchgear during operation. The fiber optic Bragg grating (FBG) modem is also externally connected to an alarm, a remote terminal, and a cloud. When the optical fiber detects that the temperature of the gearbox, generator, converter, inverter, or switchgear exceeds a set threshold, the alarm is triggered to sound an alarm.

[0007] The optical fiber consists of an optical fiber core, an aerogel insulation layer and a silicone rubber shock-absorbing outer jacket. The optical fiber core is wrapped with an aerogel insulation layer, and the outer layer of the aerogel insulation layer is provided with a silicone rubber shock-absorbing outer jacket.

[0008] Preferably, an accelerometer is also installed at the upper end of the optical fiber wrapped around the outer surface of the gearbox, generator, converter, inverter, and switch cabinet, and the accelerometer is used to detect micro-bending of the optical fiber wrapped around the outer surface of the gearbox, generator, converter, inverter, and switch cabinet due to vibration generated during operation.

[0009] Preferably, a PID controller is also electrically connected to the outside of the accelerometer, which converts the signal of the optical fiber slightly bent detected by the accelerometer into a driving instruction. A motor is installed at the lower end of the optical fiber, and a winding reel is installed at the output end of the motor to wind the lower end of the optical fiber. The PID controller controls the motor drive, and the motor drives the winding reel to straighten the optical fiber. When straightening, the optical fiber is slidably guided by the pulley group.

[0010] Preferably, a tension sensor is further provided in the middle of the optical fiber, and the tension sensor is electrically connected to the PID controller. The tension sensor detects the tension of the optical fiber during tensioning and transmits the detection signal to the PID controller.

[0011] Preferably, the outside of the substation is also connected to an environmental sensor, which includes a radiation intensity meter and an environmental temperature and humidity sensor. The radiation intensity meter is used to measure the electromagnetic radiation of the substation, especially the solar radiation. The radiation intensity meter detects that the radiation at noon on a sunny day is 800-1000W / m 2 , 100-300W / m on cloudy days 2 , the environmental sensor is electrically connected to the alarm, the remote terminal and the cloud.

[0012] Preferably, a SCADA server is further connected to the outside of the substation, and an electrical parameter acquisition module provided in the SCADA server is connected to PLC#1 that controls the converter to obtain the input / output power of the converter's electrical parameters.

[0013] Preferably, the electrical parameter acquisition module provided in the SCADA server is connected to the PLC#2 that controls the electric meter inside the switch cabinet, and acquires the input / output power of the electrical parameter of the electric meter inside the switch cabinet.

[0014] Preferably, the SCADA server transmits the collected input / output power of the electrical parameters of the converter and the input / output power of the electrical parameters of the electric meter inside the control switch cabinet to a real-time database on the SCADA server, and analyzes the collected data through the early warning analysis module on the SCADA server. The analyzed data is transmitted to the human-machine interface for real-time display. The early warning analysis module is connected to the alarm, and the early warning analysis module triggers the alarm to sound an alarm when it detects an abnormality.

[0015] Preferably, each time the fiber grating modem, environmental sensor and SCADA server detect the equipment, the data are transmitted to the remote terminal and the cloud, and the remote terminal can view the detected data in real time.

[0016] Preferably, the multidimensional regression analysis module set in the cloud establishes a dynamic model of equipment temperature = F (irradiation intensity, ambient temperature, input power, output power), and the residual warning module set in the cloud triggers a first-level alarm when the measured temperature deviates from the model predicted value by ±>15%.

[0017] The present invention has the following advantages: The present invention provides an automatic temperature measurement and early warning system for power equipment in a substation through improvement. Compared with similar equipment, the present invention has the following improvements:

[0018] The present invention discloses an automatic temperature measurement and early warning system for power equipment in a substation. The system is equipped with a fiber Bragg grating (FBG) modem and demodulator, and uses optical fibers wrapped around gear boxes, generators, converters, inverters, and switch cabinets to monitor the temperatures of the gear boxes, generators, converters, inverters, and switch cabinets in real time during operation, thereby improving the management level of key equipment and reducing the probability of equipment failure. The system detects solar radiation, temperature, and humidity in the substation using an irradiance meter and an ambient temperature and humidity sensor, thereby clearly determining whether the temperature rise of the equipment is caused by environmental factors (such as solar radiation intensity), thereby reducing the false alarm rate. The system collects the input power and output power of the equipment during operation through a SCADA server, and performs early warning analysis, thereby predicting progressive failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the temperature measurement and early warning system of the present invention;

[0020] Figure 2 This is a schematic structural diagram of the fiber Bragg grating modem of the present invention;

[0021] Figure 3 Schematic diagram of the internal structure of the optical fiber of the present invention;

[0022] Figure 4 Schematic diagram of the optical fiber tensioning structure of the present invention;

[0023] Figure 5 It is a schematic diagram of the SCADA server flow of the present invention.

[0024] Among them: substation-1, gearbox-11, generator-12, converter-13, inverter-14, switchgear-15, fiber Bragg grating modem-2, optical fiber-21, optical fiber core-211, aerogel insulation layer-212, silicone rubber shock-absorbing outer jacket-213, accelerometer-22, PID controller-23, motor-24, pulley block-25, tension sensor-26, environmental sensor-3, SCADA server-4, alarm-5, remote terminal-6, cloud-7. DETAILED DESCRIPTION

[0025] The following will be combined with the Figure 1-5 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] See also Figure 1-5The present invention provides an automatic temperature measurement and early warning system for power equipment in a substation, including a substation 1 and a fiber grating modem 2; the fiber grating modem 2 is connected to an optical fiber 21, which is wound around the outer surfaces of the gearbox 11, generator 12, converter 13, inverter 14, and switch cabinet 15 on the substation 1. The optical fiber 21 measures the temperature of the gearbox 11, generator 12, converter 13, inverter 14, and switch cabinet 15 when they are working. The fiber grating modem 2 is also externally connected to an alarm 5, a remote terminal 6, and a cloud 7. The optical fiber 21 detects that the temperature of the gearbox 11, generator 12, converter 13, inverter 14, and switch cabinet 15 is higher than 0. When the set threshold is reached, the alarm device 5 is triggered to sound an alarm; the optical fiber 21 is composed of an optical fiber core 211, an aerogel insulation layer 212, and a silicone rubber shock-absorbing outer jacket 213. The optical fiber core 211 is wrapped with an aerogel insulation layer 212, and the outer layer of the aerogel insulation layer 212 is provided with a silicone rubber shock-absorbing outer jacket 213; the upper end of the optical fiber 21 wound around the outer surface of the gearbox 11, generator 12, converter 13, inverter 14, and switch cabinet 15 is also installed with an accelerometer 22, and the accelerometer 22 is used to detect micro-bending of the optical fiber 21 wound around the outer surface of the gearbox 11, generator 12, converter 13, inverter 14, and switch cabinet 15 due to vibration during operation;

[0027] It is necessary to explain that the fiber Bragg grating modem 2 uses an FC / APC type fiber optic interface (bevel contact physical connector) to connect the fiber Bragg grating modem 2 and the optical fiber 21. Its 8° tilted end face can reduce the reflection loss to below -70dB to ensure signal integrity. The fiber Bragg grating modem 2 has a built-in supercontinuum light source (SCS) to emit wide-spectrum light (such as the 1520-1570nm band), which is transmitted to the grating array through the optical fiber 21. The optical fiber 21 itself is a temperature sensor. The positioning accuracy of the optical fiber 21 reaches 0.4 meters. Every 0.4 meters of optical fiber is equivalent to a temperature sensor. The optical fiber 21 is wound around the gearbox 11, generator 12, converter 13, inverter 14, and switch cabinet 15, so as to monitor the temperature of the gearbox 11, generator 12, converter 13, inverter 14, and switch cabinet 15 in real time during operation, thereby improving the management level of key equipment and reducing the probability of equipment failure.

[0028] The aerogel insulation layer 212 can provide high-performance thermal insulation for the optical fiber 21, and the silicone rubber shock-absorbing outer coating 213 can provide a high shock-absorbing effect for the optical fiber 21, thereby reducing the impact of vibration of the equipment on the accuracy of the temperature measurement of the optical fiber 21 on the equipment.

[0029] Preferably, the outside of the accelerometer 22 is also electrically connected to a PID controller 23, which converts the signal detected by the accelerometer 22 that the optical fiber 21 is slightly bent into a drive instruction. A motor 24 is installed at the lower end of the optical fiber 21, and a winding reel is installed at the output end of the motor 24 to wind the lower end of the optical fiber 21. The PID controller 23 controls the drive of the motor 24, and the motor 24 drives the winding reel to straighten the optical fiber 21. When straightening, the optical fiber 21 is slidably guided by the pulley set 25; a tension sensor 26 is also provided in the middle of the optical fiber 21, and the tension sensor 26 is electrically connected to the PID controller 23. The tension sensor 26 detects the tension of the optical fiber 21 during the tightening process and transmits the detection signal to the PID controller 23;

[0030] It is necessary to explain that the accelerometer 22 is a MEMS accelerometer. When the optical fiber 21 is slightly bent, the external stress will induce tiny mechanical vibrations, generating an acceleration signal of a specific frequency. The MEMS accelerometer can capture such micro-vibrations with its high sensitivity (±200g range) and low noise characteristics. The MEMS accelerometer detects the intensity and duration of the microbend signal of the optical fiber 21. The PID controller converts the signal detected by the MEMS accelerometer into a drive instruction for the motor 24, so that the motor 24 drives the winding reel to straighten the optical fiber 21, ensuring that the optical fiber 21 can be stably wound on the gearbox 11, generator 12, converter 13, inverter 14, and switch cabinet 15 for temperature measurement.

[0031] The tension sensor 26 is of model LZ-ZL7. The tension sensor 26 detects the tension of the optical fiber 21 during the tensioning process, which can effectively prevent the optical fiber 21 from being damaged due to excessive tensioning of the optical fiber 21.

[0032] Preferably, the outside of the substation 1 is further connected to an environmental sensor 3, which includes a radiation intensity meter and an environmental temperature and humidity sensor. The radiation intensity meter is used to measure the electromagnetic radiation of the substation 1, especially the solar radiation. The radiation intensity meter detects that the radiation at noon on a sunny day is 800-1000W / m 2 , 100-300W / m on cloudy days 2 The environmental sensor 3 is electrically connected to the alarm 5, the remote terminal 6 and the cloud 7. The solar radiation, temperature and humidity of the substation 1 are detected through the irradiance meter and the environmental temperature and humidity sensor, so as to clearly know whether the temperature rise of the equipment is caused by environmental factors (such as solar radiation intensity), thereby reducing the false alarm rate.

[0033] Preferably, the outside of the substation 1 is further connected to a SCADA server 4, and the electrical parameter acquisition module provided in the SCADA server 4 is connected to the PLC#1 that controls the converter 13, so as to acquire the input / output power of the electrical parameters of the converter 13; the electrical parameter acquisition module provided in the SCADA server 4 is connected to the PLC#2 that controls the electric meter inside the switch cabinet 15, so as to acquire the input / output power of the electrical parameters of the electric meter inside the switch cabinet 15; the SCADA server 4 transmits the acquired input / output power of the electrical parameters of the converter 13 and the input / output power of the electrical parameters of the electric meter inside the switch cabinet 15 to a real-time database on the SCADA server 4, and analyzes the acquired data through the early warning analysis module on the SCADA server 4, and the analyzed data is transmitted to the human-machine interface for real-time display, and the early warning analysis module is connected to the alarm 5, which triggers the alarm 5 to sound an alarm when an abnormality is detected;

[0034] It is necessary to explain that the SCADA server 4 collects the input power and output power of the equipment during operation and performs early warning analysis, thereby being able to predict progressive failures.

[0035] Preferably, the data of each device detection performed by the fiber Bragg grating modem 2, the environmental sensor 3, and the SCADA server 4 are transmitted to the remote terminal 6 and the cloud 7, and the remote terminal 6 can view the detected data in real time; the multidimensional regression analysis module provided in the cloud 7 establishes a dynamic model of device temperature = F (irradiation intensity, ambient temperature, input power, output power), and the residual early warning module provided in the cloud 7 triggers a first-level alarm when the measured temperature deviates from the model predicted value by ±>15%. For example, when the gearbox predicted temperature should be ≤85°C and the measured temperature reaches 98°C (+15.3%), the risk of bearing lubrication failure is indicated, and an alarm is issued to remind personnel to intervene in time, which can effectively avoid the occurrence of failures;

[0036] It is necessary to explain that the residual warning module is the intelligent diagnostic core of the equipment status monitoring system. Its function is to compare the deviation between the measured data and the model prediction value. For example, when performing residual warning on the bearing, when the residual slope of the bearing is greater than 0.15% / day, the remaining life of the bearing is predicted to be less than 30 days, reminding personnel to replace the bearing in time. By setting up the residual warning module, efficient early warning detection of equipment use can be carried out and the false alarm rate can be reduced.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0038] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic temperature measurement and early warning system for power equipment in a substation, comprising a substation (1) and a fiber Bragg grating modem (2); Its characteristics are: The fiber grating modem (2) is connected to an optical fiber (21), and the optical fiber (21) is wound around the outer surfaces of the gear box (11), the generator (12), the converter (13), the inverter (14), and the switch cabinet (15) on the substation (1). The optical fiber (21) measures the temperature of the gear box (11), the generator (12), the converter (13), the inverter (14), and the switch cabinet (15) when they are working. The fiber grating modem (2) is also externally connected to an alarm (5), a remote terminal (6), and a cloud (7). When the optical fiber (21) detects that the temperature of the gear box (11), the generator (12), the converter (13), the inverter (14), and the switch cabinet (15) is higher than a set threshold, the alarm (5) is triggered to issue an alarm. The optical fiber (21) is composed of an optical fiber core (211), an aerogel insulation layer (212) and a silicone rubber shock-absorbing outer jacket (213); the optical fiber core (211) is wrapped with an aerogel insulation layer (212), and the outer layer of the aerogel insulation layer (212) is provided with a silicone rubber shock-absorbing outer jacket (213).

2. The automatic temperature measurement and early warning system for power equipment in a substation according to claim 1, characterized in that: An accelerometer (22) is also installed on the upper end of the optical fiber (21) wound around the outer surface of the gear box (11), the generator (12), the converter (13), the inverter (14), and the switch cabinet (15). The accelerometer (22) detects microbending of the optical fiber (21) wound around the outer surface of the gear box (11), the generator (12), the converter (13), the inverter (14), and the switch cabinet (15) due to vibration generated during operation.

3. The automatic temperature measurement and early warning system for power equipment in a substation according to claim 2, characterized in that: The accelerometer (22) is also electrically connected to a PID controller (23) on the outside. The PID controller (23) converts a signal detected by the accelerometer (22) indicating that the optical fiber (21) is slightly bent into a drive instruction. A motor (24) is installed at the lower end of the optical fiber (21). A winding reel is installed at the output end of the motor (24) to wind the lower end of the optical fiber (21). The PID controller (23) controls the motor (24) to drive. The motor (24) drives the winding reel to straighten the optical fiber (21). During straightening, the optical fiber (21) is slidably guided by a pulley group (25).

4. The automatic temperature measurement and early warning system for power equipment in a substation according to claim 3, characterized in that: A tension sensor (26) is also provided in the middle of the optical fiber (21). The tension sensor (26) is electrically connected to the PID controller (23). The tension sensor (26) detects the tension of the optical fiber (21) during the tightening process and transmits the detection signal to the PID controller (23).

5. The automatic temperature measurement and early warning system for power equipment in a substation according to claim 1, characterized in that: The substation (1) is also connected to an environmental sensor (3) on the outside. The environmental sensor (3) includes a radiation intensity meter and an environmental temperature and humidity sensor. The radiation intensity meter is used to measure the electromagnetic radiation of the substation (1), especially solar radiation. The radiation intensity meter detects that the radiation at noon on a sunny day is 800-1000W / m 2 , 100-300W / m on cloudy days 2 The environmental sensor (3) is electrically connected to the alarm (5), the remote terminal (6) and the cloud (7).

6. The automatic temperature measurement and early warning system for power equipment in a substation according to claim 5, characterized in that: The outside of the substation (1) is also connected to a SCADA server (4), and an electrical parameter acquisition module provided in the SCADA server (4) is connected to a PLC#1 that controls the converter (13) to acquire the input / output power of the electrical parameters of the converter (13).

7. The automatic temperature measurement and early warning system for power equipment in a substation according to claim 6, characterized in that: The electrical parameter acquisition module provided in the SCADA server (4) is connected to the PLC#2 of the electric meter inside the control switch cabinet (15) to acquire the input / output power of the electrical parameter of the electric meter inside the control switch cabinet (15).

8. The automatic temperature measurement and early warning system for power equipment in a substation according to claim 7, characterized in that: The SCADA server (4) transmits the collected electrical parameters of the input / output power of the converter (13) and the electrical parameters of the internal electric meter of the control switch cabinet (15) to a real-time database on the SCADA server (4), and analyzes the collected data through an early warning analysis module on the SCADA server (4). The analyzed data is transmitted to a human-machine interface for real-time display. The early warning analysis module is connected to an alarm (5). When the early warning analysis module detects an abnormality, the alarm (5) is triggered to issue an alarm.

9. The automatic temperature measurement and early warning system for power equipment in a substation according to claim 8, characterized in that: Each time the fiber optic Bragg grating modem (2), environmental sensor (3) and SCADA server (4) detect the equipment, the data is transmitted to the remote terminal (6) and the cloud (7), and the remote terminal (6) can view the detected data in real time.

10. The automatic temperature measurement and early warning system for power equipment in a substation according to claim 9, characterized in that: The multidimensional regression analysis module provided in the cloud (7) establishes a dynamic model of equipment temperature = F (irradiation intensity, ambient temperature, input power, output power), and the residual early warning module provided in the cloud (7) triggers a first-level alarm when the measured temperature deviates from the model predicted value by ±>15%.

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