Temperature diagnosis system of cable head

Abstract

The utility model discloses a temperature diagnosis system for a cable head, which comprises a current sensor, a wireless temperature sensor, an environment temperature sensor and a signal processing unit, the current sensor is arranged on a protection layer of the cable head to collect cable load current data, and the wireless temperature sensor is arranged at the position of the cable head to measure the temperature of a cable metal layer. The wireless temperature sensor is in signal connection with the current sensor, the current sensor sends a signal to the wireless temperature sensor to wake up the wireless temperature sensor to perform temperature measurement when detecting current abnormity, and the wireless temperature sensor is in a sleep state after sending temperature information to the signal processing unit; the environment temperature sensor is arranged on the outer surface of the cable to measure the current environment temperature, and the signal processing unit is connected with the wireless temperature sensor and the environment temperature sensor to compare the temperature detected by the wireless temperature sensor with the temperature detected by the environment temperature sensor. And when the temperature difference between the two exceeds a temperature threshold, an alarm is triggered.

Description

Temperature diagnostic system for cable heads Technical Field

[0001] This utility model belongs to the field of power, and specifically relates to a temperature diagnosis system for cable heads. Background Technology

[0002] Currently, the main fault in cable terminations in power systems lies in the partial discharge caused by insulation aging, which leads to a continuous temperature rise and severe overheating of the cable termination. If the cable termination remains under high temperatures for an extended period, it can cause power system failures and result in significant economic losses. In current engineering applications, various types of temperature sensors are commonly used to measure the temperature of cable joints. This method does not alter the cable's operating behavior and is very simple to install and use, but it cannot avoid the influence of ambient temperature, often leading to misjudgments. Furthermore, due to the large number of cable terminations in power systems and the large data output of each temperature sensor, the monitoring center is easily overloaded. When a fault occurs in the power system, maintenance personnel must carefully check the temperature sensor data to finally locate the cable termination fault. However, since temperature sensors include both normal and abnormal temperatures, the troubleshooting process is cumbersome and increases the time spent on power outages, significantly impacting power supply reliability and consuming substantial manpower and time costs. Summary of the Invention

[0003] Therefore, the purpose of this utility model is to provide a temperature diagnostic system for cable heads to overcome the above-mentioned shortcomings and deficiencies of the prior art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A temperature diagnostic system for cable heads, comprising:

[0006] The cable includes a current sensor, a wireless temperature sensor, an ambient temperature sensor, and a signal processing unit. The current sensor is installed on the cable joint protective layer to collect cable load current data. The wireless temperature sensor is installed at the cable joint to measure the temperature of the cable's metal layer. The wireless temperature sensor is signal-connected to the current sensor. When the current sensor detects an abnormal current, it sends a signal to the wireless temperature sensor to wake it up and perform temperature measurement. The ambient temperature sensor is installed on the outer surface of the cable to measure the current ambient temperature. The signal processing unit is connected to both the wireless temperature sensor and the ambient temperature sensor to compare the temperature detected by the wireless temperature sensor with the temperature detected by the ambient temperature sensor. When the temperature difference exceeds a temperature threshold, an alarm is triggered and a control signal is output.

[0007] In one embodiment, the signal processing unit is electrically connected to a temperature controller, and the temperature controller is electrically connected to an alarm.

[0008] In one embodiment, the signal processing unit is the main controller.

[0009] In one embodiment, the wireless temperature sensor is model BM100.

[0010] In one embodiment, the wireless temperature sensor includes a temperature acquisition module, a microprocessor module, and a wireless communication module, wherein the temperature acquisition module is electrically connected to the microprocessor module and the wireless communication module, respectively.

[0011] In one embodiment, the alarm is a speaker.

[0012] In one embodiment, a fuse is also included, which is mounted on the cable. The monitoring center is communicatively connected to the signal processing unit to receive control signals, and the monitoring center controls the fuse to disconnect the circuit.

[0013] The beneficial effects of this utility model due to the adoption of the above technical solution include: triggering the wireless temperature sensor to work through the abnormal signal of the current sensor, so that all the temperature data it uploads is abnormal data, avoiding data transmission in the normal state, greatly reducing the amount of data transmission and improving efficiency; at the same time, the wireless temperature sensor directly determines the cable fault upon detecting the abnormality, avoiding the problem that the monitoring center needs to analyze the data of the current sensor and the wireless temperature sensor at the same time to determine whether there is a fault. In addition, the wireless temperature sensor is in sleep mode most of the time, and can operate for a long time without external power supply or battery replacement, greatly extending the online service life of the temperature sensor; by setting an ambient temperature sensor, the interference of the surrounding ambient temperature on the cable joint temperature is avoided, improving the accuracy of the temperature sensor in detecting the cable joint. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the structure of a temperature diagnostic system for a cable head according to an embodiment of the present invention.

[0015] Explanation of icon numbers:

[0016] 100 - Wireless temperature sensor; 200 - Current sensor; 300 - Signal processing unit; 400 - Ambient temperature sensor. Detailed Implementation

[0017] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Referring to Figure 1, for example, a temperature diagnostic system for a cable head includes: a current sensor, a wireless temperature sensor, an ambient temperature sensor, and a signal processing unit. The current sensor is disposed on the cable joint protective layer to collect cable load current data. The wireless temperature sensor is disposed at the cable joint to measure the temperature of the cable's metal layer. The wireless temperature sensor is signal-connected to the current sensor. When the current sensor detects an abnormal current, it sends a signal to the wireless temperature sensor to wake it up and perform temperature measurement. For example, if the current sensor detects a current exceeding a threshold, it indicates an abnormality and sends a signal to the wireless temperature sensor to wake it up and perform temperature measurement. The ambient temperature sensor is disposed on the outer surface of the cable to measure the current ambient temperature. The signal processing unit is connected to both the wireless temperature sensor and the ambient temperature sensor to compare the temperature detected by the wireless temperature sensor with the temperature detected by the ambient temperature sensor. When the temperature difference exceeds a temperature threshold, an alarm is triggered and a control signal is output. An ambient temperature sensor is included to prevent external environmental factors from affecting the measurement of the wireless temperature sensor.

[0024] The aforementioned temperature diagnostic system triggers the wireless temperature sensor to operate based on an abnormal signal from the current sensor, ensuring that all uploaded temperature data is abnormal. This avoids data transmission during normal operation, significantly reducing data transmission volume and improving efficiency. Simultaneously, the wireless temperature sensor directly identifies cable faults upon detecting anomalies, eliminating the need for the monitoring center to analyze data from both the current and wireless temperature sensors to determine a fault. Furthermore, the wireless temperature sensor operates in sleep mode most of the time, allowing for extended operation without external power or battery replacement, greatly extending its online lifespan. Finally, by incorporating an ambient temperature sensor, interference from surrounding temperatures on cable joint temperatures is avoided, improving the accuracy of the temperature sensor's detection of cable joints.

[0025] In this embodiment, a current sensor and a wireless temperature sensor form a set of sensing units. Setting up more than one set of sensing units in this system helps to improve its reliability.

[0026] In one embodiment, the signal processing unit is electrically connected to a thermostat, and the thermostat is electrically connected to an alarm. For example, the thermostat has a preset temperature threshold of 7 degrees Celsius. When the temperature detected by the wireless temperature sensor and the temperature detected by the ambient temperature sensor differ from the temperature detected by the ambient temperature sensor by more than 7 degrees Celsius, the signal processing unit sends an alarm signal to the alarm via the thermostat. The alarm is a speaker.

[0027] In one embodiment, the signal processing unit is the main controller.

[0028] In one embodiment, the wireless temperature sensor is model BM100 and can store data itself.

[0029] In one embodiment, the wireless temperature sensor includes a temperature acquisition module, a microprocessor module, and a wireless communication module. The temperature acquisition module is electrically connected to both the microprocessor module and the wireless communication module. The wireless communication module is signal-connected to the current sensor to receive abnormal current signals. The wireless communication module sends the abnormal current signals to the microprocessor module. After receiving the signals from the wireless communication module, the microprocessor module outputs a wake-up signal to the temperature acquisition module, which then starts operating. The wireless temperature sensor also includes a positioning module, which is electrically connected to the wireless communication module. The wireless communication module receives temperature data from the temperature acquisition module and positioning data from the positioning module, compresses and packages the temperature data and positioning data, and sends them to the signal processing unit. The positioning module can be a GPS module or a BeiDou positioning module.

[0030] In one embodiment, the system further includes a fuse (this is prior art, and its structure will not be described in detail), which is installed on the cable. The monitoring center is communicatively connected to the signal processing unit to receive control signals, and the monitoring center controls the fuse to disconnect the circuit.

[0031] The above description of the embodiments is provided to enable those skilled in the art to understand and use the present invention. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A temperature diagnostic system for a cable head, characterized by include: The cable includes a current sensor, a wireless temperature sensor, an ambient temperature sensor, and a signal processing unit. The current sensor is installed on the cable joint protective layer to collect cable load current data. The wireless temperature sensor is installed at the cable joint to measure the temperature of the cable's metal layer. The wireless temperature sensor is signal-connected to the current sensor. When the current sensor detects an abnormal current, it sends a signal to the wireless temperature sensor to wake it up and perform temperature measurement. The ambient temperature sensor is installed on the outer surface of the cable to measure the current ambient temperature. The signal processing unit is connected to both the wireless temperature sensor and the ambient temperature sensor to compare the temperature detected by the wireless temperature sensor with the temperature detected by the ambient temperature sensor. When the temperature difference exceeds a temperature threshold, an alarm is triggered and a control signal is output.

2. The temperature diagnostic system for a cable head as claimed in claim 1, characterized in that The signal processing unit is electrically connected to a temperature controller, and the temperature controller is electrically connected to an alarm.

3. The temperature diagnostic system for a cable head as claimed in claim 1, characterized in that, The signal processing unit is the main control unit.

4. The temperature diagnostic system for cable heads according to claim 1, characterized in that, The wireless temperature sensor is model BM100.

5. The temperature diagnostic system for a cable head as claimed in claim 1, characterized in that, The wireless temperature sensor includes a temperature acquisition module, a microprocessor module, and a wireless communication module, wherein the temperature acquisition module is electrically connected to the microprocessor module and the wireless communication module.

6. The temperature diagnostic system for cable heads according to claim 2, characterized in that, The alarm is a loudspeaker.

7. The temperature diagnostic system for cable heads according to claim 1, characterized in that, It also includes a fuse, which is installed on the cable. The monitoring center is communicatively connected to the signal processing unit to receive control signals, and the monitoring center controls the fuse to disconnect the circuit.

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