Passive wireless temperature measuring device for high-voltage overhead conductor fitting

Abstract

The invention, which relates to the technical field of temperature measurement, provides a passive wireless temperature measurement device for a high-voltage overhead conductor fitting, comprising a high-voltage overhead conductor, a CT induction power supply, an energy storage capacitor, a temperature measurement module, a microcontroller and a communication module. The CT induction electricity taking power supply is connected with the high-voltage overhead conductor, takes electricity from the high-voltage overhead conductor and inputs the electricity into the energy storage capacitor; the temperature measuring module, the microcontroller and the communication module are all connected with the energy storage capacitor, and the energy storage capacitor provides stable power supply for the device; the temperature measurement module measures the temperature of the wire fitting at the position to be measured and the environment temperature. The microcontroller takes a difference value between the temperature of the wire fitting at the to-be-measured position and the environment temperature as temperature rise data of the wire fitting; and the communication module reports the wire fitting temperature, the environment temperature and the temperature rise data at the to-be-measured position to a background server. The precision of temperature measurement of the wire fitting can be improved, and whether the wire fitting is abnormal in heating or not can be accurately judged.

Description

Technical Field

[0001] The invention relates to the technical field of temperature measurement, in particular to a passive wireless temperature measuring device for high-voltage overhead conductor hardware. Background Art

[0002] In the field of high-voltage power transmission monitoring, the abnormal status of the transmission cable during operation is monitored. The high-voltage cable joints use wire fittings to connect different cable segments to transmit power. The wire fittings are crimped to nest the cables. When transmitting power, the joints of the fittings are prone to excessive temperatures. High temperatures will cause aging of the insulation material, thermal expansion, and accelerated oxidation of the contact points, leading to increased resistance, which in turn will cause equipment failures, cable short circuits, fires and other serious consequences. By monitoring the temperature of power transmission wire fittings, high-voltage transmission and substation failures can be prevented, ensuring the safe and reliable operation of the power system. Therefore, taking effective measures to monitor the contact temperature of high-voltage wire fittings is a major issue that the power system urgently needs to solve.

[0003] At present, there are relatively few instruments specifically used for measuring the heating of high-voltage conductor fittings. The commonly used temperature monitoring method is to apply a layer of luminescent material whose color changes with temperature on the high-voltage electrical contact surface, and roughly determine the temperature range by observing its color change. This method has low accuracy and poor reliability, and cannot perform quantitative measurements. Another method is to use infrared imaging devices that use infrared thermal radiation characteristics. It has high accuracy, non-contact measurement, and is flexible and convenient to use. However, due to its high price, it is difficult to promote and apply it. In addition, the above two methods require manual inspections, which are intermittent detections, are not real-time, and cannot provide real-time temperature alarm functions.

[0004] The existing wireless temperature measuring devices on the market use a single-point temperature measurement method. The temperature measuring device is directly attached to the position of the conductor fittings. It only measures the temperature of the metal part and does not have the function of measuring the ambient temperature. However, due to the heat dissipation problem of the contact metal parts, the measured temperature rise needs to consider the influence of the ambient temperature on it. In particular, the ambient temperature of outdoor overhead cables varies greatly, resulting in large differences in the heat dissipation of the conductor fittings. Therefore, the abnormal temperature change at the contact position requires the ambient temperature to be accurately judged. The lack of ambient temperature as a reference leads to low accuracy in the temperature measurement of metal parts. Summary of the invention

[0005] In order to solve the technical problem in the prior art that the lack of ambient temperature as a reference leads to low temperature measurement accuracy of metal parts, the present invention provides a passive wireless temperature measurement device for high-voltage overhead conductor hardware.

[0006] The technical solution provided by the embodiment of the present invention is as follows:

[0007] A high-voltage overhead conductor hardware passive wireless temperature measurement device provided in an embodiment of the present invention comprises: a high-voltage overhead conductor, a CT induction power supply, an energy storage capacitor, a temperature measurement module, a microcontroller and a communication module;

[0008] The high-voltage overhead wire, the CT induction power supply, the energy storage capacitor, the temperature measurement module and the communication module are all connected to the microcontroller;

[0009] The CT induction power supply is connected to the high-voltage overhead wire, and the CT induction power supply draws power from the high-voltage overhead wire and inputs it into the energy storage capacitor;

[0010] The temperature measurement module, the microcontroller and the communication module are all connected to the energy storage capacitor, and the energy storage capacitor provides a stable power supply for the device;

[0011] The temperature measurement module measures the temperature of the conductor fittings and the ambient temperature at the position to be measured respectively;

[0012] The microcontroller uses the difference between the temperature of the wire fitting at the position to be measured and the ambient temperature as the temperature rise data of the wire fitting;

[0013] The communication module reports the conductor fitting temperature at the position to be measured, the ambient temperature and the temperature rise data to the background server.

[0014] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0015] (1) In the present invention, the temperature measuring device can simultaneously measure the temperature of the wire fitting and the ambient temperature, and use the difference between the temperature of the wire fitting and the ambient temperature at the measured position as the temperature rise data of the wire fitting, thereby improving the accuracy of the wire fitting temperature measurement and accurately judging whether the wire fitting is abnormally heated.

[0016] (2) In the present invention, CT induction is used to draw power, and a communication module is used to report the temperature of the conductor fittings, the ambient temperature, and the temperature rise data at the measured position to the background server, thereby realizing passive wireless installation. This greatly simplifies the deployment difficulty for outdoor elevated cable construction environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1A schematic diagram of a passive wireless temperature measurement device for high-voltage overhead conductor hardware provided by an embodiment of the present invention;

[0019] Figure 2 A schematic structural diagram of a passive wireless temperature measurement device for high-voltage overhead conductor fittings provided in an embodiment of the present invention.

[0020] [Reference Signs]

[0021] 1. High-voltage overhead wire; 2. CT induction power supply; 21. CT core; 3. Energy storage capacitor; 4. Temperature measurement module; 41. Temperature measurement circuit board; 42. Wire fitting temperature measurement probe; 43. Environmental temperature measurement probe; 5. Microcontroller; 6. Communication module. DETAILED DESCRIPTION

[0022] The following is a detailed description of the lower limb structure of a bipedal walking robot capable of standing upright provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0023] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0024] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0025] Reference Manual Attached Figure 1 , shows a schematic diagram of a passive wireless temperature measurement device for high-voltage overhead conductor fittings provided in an embodiment of the present invention.

[0026] Reference Manual Attached Figure 2 , showing a schematic structural diagram of a passive wireless temperature measurement device for high-voltage overhead conductor fittings provided in an embodiment of the present invention.

[0027] An embodiment of the present invention provides a passive wireless temperature measurement device for high-voltage overhead conductor fittings, comprising: a high-voltage overhead conductor 1, a CT induction power supply 2, an energy storage capacitor 3, a temperature measurement module 4, a microcontroller 5 and a communication module 6.

[0028] The high-voltage overhead conductor 1 , the CT induction power supply 2 , the energy storage capacitor 3 , the temperature measurement module 4 and the communication module 6 are all connected to the microcontroller 5 .

[0029] The CT induction power supply 2 is connected to the high-voltage overhead wire 1 , and the CT induction power supply 2 draws power from the high-voltage overhead wire 1 and inputs it into the energy storage capacitor 3 .

[0030] In the present invention, CT induction is used to draw power, and a communication module is used to report the temperature of the conductor fittings, the ambient temperature, and the temperature rise data at the measured position to the background server, thereby realizing passive wireless installation, which greatly simplifies the deployment difficulty for outdoor elevated cable construction environments.

[0031] The temperature measurement module 4, the microcontroller 5 and the communication module 6 are all connected to the energy storage capacitor 3, and the energy storage capacitor 3 provides a stable power supply for the device.

[0032] The temperature measuring module 4 measures the temperature of the conductor fittings and the ambient temperature at the position to be measured respectively.

[0033] The microcontroller 5 uses the difference between the temperature of the conductor fitting at the position to be measured and the ambient temperature as the temperature rise data of the conductor fitting.

[0034] In the present invention, the temperature measuring device can measure the temperature of the wire fittings and the ambient temperature at the same time, and use the difference between the temperature of the wire fittings at the measured position and the ambient temperature as the temperature rise data of the wire fittings, thereby improving the accuracy of the temperature measurement of the wire fittings and accurately judging whether the wire fittings are abnormally heated.

[0035] Specifically, the microcontroller unit (MCU) 5 measures the resistance change of the temperature sensing element on the temperature measuring probe through an analog-to-digital converter (ADC) to obtain a temperature value, and the difference between the two temperature measurement values ​​is used as the temperature rise data of the conductor fittings.

[0036] Optionally, the microcontroller 5 adopts a low-power Cortex-M0 microcontroller, which has the functions of performing simple threshold judgment and micro-power sleep locally.

[0037] The communication module 6 reports the conductor fitting temperature, ambient temperature and temperature rise data at the position to be tested to the background server.

[0038] Furthermore, the background server is responsible for functions such as temperature measurement data storage, big data analysis, and device access management, and users browse and query temperature data through clients such as the Web or mobile APP.

[0039] In a possible implementation, the temperature measurement module 4 includes a temperature measurement circuit board 41, a wire fitting temperature measurement probe 42, and an environmental temperature measurement probe 43. The wire fitting temperature measurement probe 42 and the environmental temperature measurement probe 43 are both connected to the temperature measurement circuit board 41. The wire fitting temperature measurement probe 42 is extended to the position to be measured by a lead wire to collect the temperature of the wire fitting at the position to be measured. The environmental temperature measurement probe 43 is arranged on the temperature measurement circuit board 41 to collect the environmental temperature.

[0040] It should be noted that by measuring the temperature of the conductor fittings and the ambient temperature at the same time, the temperature difference between the two, namely the "temperature rise data", can be calculated, which can more accurately determine whether the conductor fittings are abnormally hot. Measuring the fitting temperature alone cannot effectively distinguish between normal ambient temperature changes and abnormal fitting temperature rise.

[0041] Optionally, the conductor fitting temperature measuring probe 42 uses a lead-type NTC resistor, a PT100 platinum thermal resistor, or other thermal sensitive elements.

[0042] Optionally, the conductor fitting temperature measuring probe 42 is adhered to the position to be measured by means of a high-insulation thermal conductive adhesive.

[0043] In the present invention, a lead-type temperature probe is used, which can be flexibly extended to the position of the wire fittings to be monitored, and can adapt to the installation requirements of fittings of different shapes, sizes and positions. The temperature probe is separated from the temperature measurement acquisition module, which is easy to achieve high-voltage insulation isolation in structure, and it is convenient to install the temperature probe on wire fittings of different shapes and sizes.

[0044] In a possible implementation, the CT induction power supply 2 includes a CT core 21. The CT core 21 passes through the high-voltage overhead conductor 1, and the power frequency current flowing through the high-voltage overhead conductor 1 generates a magnetic field, and the secondary coil loop of the CT core 21 generates an induced voltage, and the induced voltage is input into the energy storage capacitor 3.

[0045] In a possible implementation manner, the CT core 21 adopts a half-open-edge structure.

[0046] It should be noted that the CT core 21 adopts a semi-open-edge structure, which can be easily installed on the high-voltage overhead conductor 1.

[0047] In a possible implementation manner, the CT core 21 is made of silicon steel sheet or Permalloy sheet.

[0048] In a possible implementation manner, the inner ring wall of the CT magnetic core 21 is coated with an insulating and heat-insulating material.

[0049] It should be noted that insulating and heat-insulating materials can be used for high-voltage electrical isolation and heat conduction between isolating devices and hardware to avoid temperature measurement errors.

[0050] In the present invention, the probe lead and the CT induction power supply are designed to be wrapped with high-insulation materials, which effectively electrically isolate the high-voltage power cables and prevent the temperature measuring device from being damaged by high voltage breakdown.

[0051] In a possible implementation, the insulating and heat-insulating material includes an aerogel felt substrate and an insulating and heat-insulating buffer layer.

[0052] Optionally, the aerogel uses silica aerogel as the main material and is compounded into reinforcing fibers, such as glass fibers and pre-oxidized fibers, to form a flexible thermal insulation material synthesized through a special process.

[0053] Optionally, the insulating and heat-insulating buffer layer is made of soft silicone, and the soft silicone is wrapped on the outside.

[0054] In a possible implementation, a rectifier module, a filter module and a voltage stabilizing module are provided between the high-voltage overhead conductor 1 and the energy storage capacitor 3. The high-voltage overhead conductor 1 takes power from the high-voltage overhead conductor 1, and after being processed by the rectifier module, the filter module and the voltage stabilizing module, the power is input into the energy storage capacitor 3.

[0055] In a possible implementation, the communication module (6) adopts a 4G or NB-IoT mode.

[0056] In the present invention, two-way temperature probes are used to measure the temperature of the wire fittings and the ambient temperature at the same time, and the temperature difference is used as the temperature rise data of the wire fittings. Compared with the existing similar wireless temperature measuring devices, which only measure the temperature of the wire fittings, it is difficult to determine the temperature rise data of the wire fittings. The lead-type temperature probe design can be easily installed on wire fittings of different sizes and shapes, and can easily use insulating materials for high-voltage insulation isolation. The design of wireless communication and CT induction power supply eliminates the need for wiring for the entire temperature measuring device, and installation and deployment are very convenient.

[0057] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A passive wireless temperature measurement device for high-voltage overhead conductor hardware, characterized in that: include: High-voltage overhead conductors, CT induction power supply, energy storage capacitors, temperature measurement modules, microcontrollers and communication modules; The high-voltage overhead wire, the CT induction power supply, the energy storage capacitor, the temperature measurement module and the communication module are all connected to the microcontroller; The CT induction power supply is connected to the high-voltage overhead wire, and the CT induction power supply draws power from the high-voltage overhead wire and inputs it into the energy storage capacitor; The temperature measurement module, the microcontroller and the communication module are all connected to the energy storage capacitor, and the energy storage capacitor provides a stable power supply for the device; The temperature measurement module measures the temperature of the conductor fittings and the ambient temperature at the position to be measured respectively; The microcontroller uses the difference between the temperature of the wire fitting at the position to be measured and the ambient temperature as the temperature rise data of the wire fitting; The communication module reports the conductor fitting temperature at the position to be measured, the ambient temperature and the temperature rise data to the background server.

2. The passive wireless temperature measuring device for high-voltage overhead conductor hardware according to claim 1, characterized in that: The temperature measurement module includes a temperature measurement circuit board, a conductor hardware temperature measurement probe and an environmental temperature measurement probe; The conductor fitting temperature measuring probe and the environment temperature measuring probe are both connected to the temperature measuring circuit board; The conductor fitting temperature measuring probe is extended to the position to be measured by a lead wire, and the conductor fitting temperature at the position to be measured is collected; The environmental temperature measuring probe is arranged on the temperature measuring circuit board to collect the environmental temperature.

3. The passive wireless temperature measuring device for high-voltage overhead conductor hardware according to claim 2 is characterized in that: The conductor hardware temperature measuring probe is adhered to the position to be measured by means of a high-insulation thermal conductive adhesive.

4. The passive wireless temperature measuring device for high-voltage overhead conductor hardware according to claim 1, characterized in that: The CT induction power supply includes a CT magnetic core; The CT core passes through the high-voltage overhead conductor, the industrial frequency current flowing through the high-voltage overhead conductor generates a magnetic field, the secondary coil loop of the CT core generates an induced voltage, and the induced voltage is input into the energy storage capacitor.

5. The passive wireless temperature measuring device for high-voltage overhead conductor hardware according to claim 4 is characterized in that: The CT magnetic core adopts a half-open-edge structure.

6. The passive wireless temperature measurement device for high-voltage overhead conductor hardware according to claim 4, characterized in that: The material of the CT magnetic core is silicon steel sheet or Permalloy sheet.

7. The passive wireless temperature measurement device for high-voltage overhead conductor hardware according to claim 4, characterized in that: The inner ring wall of the CT magnetic core is coated with insulating and heat-insulating material.

8. The passive wireless temperature measurement device for high-voltage overhead conductor hardware according to claim 7, characterized in that: The insulating and heat-insulating material comprises an aerogel felt substrate and an insulating and heat-insulating buffer layer.

9. The passive wireless temperature measurement device for high-voltage overhead conductor hardware according to claim 1, characterized in that: A rectifier module, a filter module and a voltage stabilizing module are arranged between the high-voltage overhead conductor and the energy storage capacitor; The high-voltage overhead wire draws electricity from the high-voltage overhead wire, and after being processed by the rectifier module, the filter module and the voltage stabilizing module, the electricity is input into the energy storage capacitor.

10. The passive wireless temperature measuring device for high-voltage overhead conductor hardware according to claim 1, characterized in that: The communication module adopts 4G or NB-IoT mode.

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