Temperature measuring plug of high-voltage cable

Abstract

The invention discloses a passive self-power-taking temperature measurement plug based on the principle of high-voltage cable capacitor energy taking, the temperature measurement plug comprises a plug main body made of an insulating material, a metal piece, a circuit board, an antenna board and a metal cover are arranged in the plug main body, the metal piece is connected with a high-voltage electrified body of a cable terminal, and the metal cover is connected with the circuit board. The metal piece is conductively connected with the circuit board, and the circuit board is arranged between the metal piece and the metal cover; the metal piece and the metal cover form a power taking capacitor, and potential difference is formed in an alternating electric field formed in the T-shaped cable connector and the plug to supply power to the circuit board. And the circuit board transmits the measured temperature to terminal receiving equipment through the wireless transmission module, so that remote temperature monitoring of the high-voltage power grid is realized.

Description

Technical Field

[0001] The invention relates to the field of temperature measurement of electric power equipment, and is a cable plug and a temperature measurement system with a passive wireless temperature measurement function, and is particularly suitable for continuous temperature monitoring of an AC 50HZ, 10kV power network. Background Art

[0002] At present, the cable joints in the 10KV ring network cabinet are sealed by the cabinet body. Under normal operation, it is impossible to inspect the temperature changes of the internal cable elbows. The cable joints in the ring network cabinet heat up due to aging or excessive contact resistance. The temperature of the heating part cannot be monitored in real time, which can easily lead to equipment burnout or sudden power outages. The elbow temperature of the ring network cabinet is an important indicator for measuring the safe operation of the ring network cabinet. If the elbow temperature of the ring network cabinet is too high, it is easy to cause an explosion accident, affecting the safe and stable operation of the system. Therefore, it is necessary to strictly control the elbow temperature of the ring network cabinet.

[0003] In the past, manual measurement was usually used to measure the temperature of the elbow head of the ring network cabinet. However, this measurement method is labor-intensive and cannot achieve real-time online temperature monitoring. In the process of temperature rise, it cannot guarantee that the real-time temperature will be transmitted to the operation monitoring personnel in time for monitoring and early warning operations. Infrared temperature measurement is usually also used, but it is difficult to configure infrared measurement windows for most ring network cabinets. Even if they are equipped with infrared detection windows, due to the limitations of the window size, it is difficult to ensure that the elbow head can be measured in all directions during the test. Therefore, during the operation of the ring network cabinet, real-time temperature measurement cannot be performed through the infrared measurement window or unpacking. Summary of the invention

[0004] In view of the above-mentioned defects of the above temperature measurement technology, the present invention discloses a passive self-powered temperature measuring plug based on the principle of high-voltage cable capacitor energy extraction, the temperature measuring plug includes a plug body made of insulating material, a metal part, a circuit board, an antenna board and a metal cover are arranged in the plug body, the metal part is connected to the high-voltage charged body of the cable terminal head, the metal part is conductively connected to the circuit board, and the circuit board is arranged between the metal part and the metal cover; the metal part and the metal cover form a power extraction capacitor, and form a potential difference in the alternating electric field formed inside the T-type cable connector and the plug to power the circuit board. The circuit board transmits the measured temperature to the terminal receiving device through the wireless transmission module, thereby realizing remote temperature monitoring of the high-voltage power grid.

[0005] Preferably, the metal part is arranged inside the epoxy plug and is coaxial with the epoxy plug. A metal drainage screw is connected to one side of the metal part, and the drainage screw is led out to one side of the epoxy plug and connected to the positive pole of the power supply of the monitoring module that needs power supply. The negative pole of the power supply of the monitoring module is fixed to the metal insert. The metal insert is provided with a guide connection hole (groove) of the shielding cap. The shielding cap includes a semi-insulating layer and a guide boss. The guide boss and the semi-insulating layer are integrally formed and are conductive to each other. When in use, the guide boss cooperates with the guide connection hole of the metal insert and is connected so that the negative pole of the power supply of the monitoring module is connected and conductive to the semi-insulating layer of the shielding cap. The shielding cap is installed on the 10KV quick connector so that the semi-conductive layer of the shielding cap is conductive to the outer shell of the 10KV quick plug semi-conductive layer. After the outer shell of the 10KV connector is grounded, the negative pole of the monitoring module is grounded.

[0006] Preferably, the metal part is coaxially installed inside the epoxy plug and a threaded hole is provided on the surface of the metal part.

[0007] Preferably, the present solution further comprises a guide screw, the lower bottom surface of the circuit board is mounted on a metal member, and an insulating pad is provided between the circuit board and the metal member.

[0008] Preferably, a fixing through hole is provided on the circuit board, and the conductive screw passes through the fixing through hole on the circuit board and is connected with the threaded hole of the metal part.

[0009] Preferably, the present solution further comprises an antenna board, wherein the antenna board is arranged in the metal cover and connected to the circuit board via a wire.

[0010] Preferably, the metal cover is placed in the epoxy plug and is in a relative position to the metal part in the epoxy plug.

[0011] Preferably, the axial circumferential surface of the metal part is provided with a chamfer, and the radial circumferential surface of the metal part is provided with a groove. Preferably, the circuit board is provided with a temperature measuring chip, a microprocessor, a communication module and a power supply module, the signal output end of the temperature measuring chip is electrically connected to the signal input end of the microprocessor, the input end of the communication module is communicatively connected to the signal processing output end of the microprocessor, and the output end of the power supply module forms a closed electrical circuit with the microprocessor, the temperature measuring chip and the communication module. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the temperature measuring plug structure according to a specific embodiment of the present invention; Figure 2 It is a schematic diagram of the temperature measurement of the temperature measuring plug and the high-voltage cable connector according to a specific embodiment of the present invention. Description of Reference Numerals

[0013] 1: Epoxy material; 2: Temperature measurement module; 3: Metal inserts; 4: Capacitor plates; 5: Epoxy resin shell; 11: T-type connector for high voltage cable; 12: Temperature measuring plug; 13: High voltage cable. Implementation

[0014] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below with reference to the accompanying drawings and through specific embodiments. Figure 1 For reference.

[0015] Typical cases: See also Figure 1 The present invention provides a technical solution for a high-voltage cable temperature measuring plug, which includes an epoxy resin shell 5, a capacitor plate 4, a metal insert 3, a temperature measuring module 2 and an epoxy material potting glue 1.

[0016] The temperature measuring plug 12 is formed by vacuum casting of epoxy resin material, and the capacitor plate 4 and metal insert 3 are embedded in the temperature measuring plug. The temperature measuring module 2 is connected to the metal insert 3 and the capacitor plate 4 through a wire. The temperature measuring module 2 is potted in the insulating plug epoxy material by epoxy potting glue 1.

[0017] like Figure 2 As shown, after the high-voltage cable T-joint 11 and the temperature measuring plug 12 are connected, the metal insert 3 is connected to the high-voltage cable, and a distance is set between the metal insert 3 and the capacitor plate 4. The temperature measuring module 2 is connected to the metal insert 3 and the capacitor plate 4 through a wire. Because the high-voltage cable 13 has a stable high voltage, the metal insert 3 and the capacitor plate 4 can form an energy-taking capacitor to power the temperature measuring module 2.

[0018] The temperature measurement module monitors and collects the temperature of the high-voltage cable, and then processes the temperature data detected by the electric field energy acquisition temperature measurement module through the data processing module. After processing, the data processed by the data processing module will be sent through the sending module, and the sent data will be received by the antenna.

[0019] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0022] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0023] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A temperature measuring plug for a high voltage cable, characterized in that: It includes a metal part 1, a temperature measuring module 2, a metal cover 3, a capacitor plate 4 and an epoxy resin shell 5, and is characterized in that: the temperature measuring module 2 is fixed to the metal part by a guide screw, the metal cover 3 is installed between the metal part and the epoxy resin shell, the capacitor plate 4, the metal part 1 is provided with a thread connected to the high-voltage cable on the inner side, the metal cover 3 has a stable high voltage by being connected to the high-voltage cable, and a distance is provided between the capacitor plate 4 and the metal insert 3.

2. A temperature measuring plug for a high voltage cable according to claim 1, characterized in that The temperature measuring module 2 is connected to the capacitor plate 4 and the metal insert 3 through a wire, and the temperature measuring module is integrated into the circuit board.

3. The temperature measuring plug for a high voltage cable according to claim 1, characterized in that: The plug metal part is a hollow metal structure, including two small front cylinders and a large rear cylinder with different diameters, a first step is formed between the small front cylinder and the large rear cylinder, and a semi-closed threaded connection hole is provided on the large rear cylinder.

4. A temperature measuring plug for a high voltage cable as claimed in claim 3, characterized in that: The measuring part is arranged around the small cylinder at the front end, and includes an annular PCB gasket, a sensor antenna, and a sensor chip. The end face of the small cylinder at the front end close to the large cylinder at the rear end forms the first step. The large cylinder at the rear end is provided with a connecting hole connected to the annular PCB gasket, and the sensor chip is arranged on the annular PCB gasket.

5. A temperature measuring plug for a high voltage cable as claimed in claim 4, characterized in that: The measuring part is arranged around the small cylinder at the front end, and includes an annular PCB gasket, a sensor antenna, and a sensor chip. The end face of the small cylinder at the front end close to the large cylinder at the rear end forms the first step. The large cylinder at the rear end is provided with a connecting hole connected to the annular PCB gasket, and the sensor chip is arranged on the annular PCB gasket.

6. A temperature measuring plug for a high voltage cable as claimed in claim 5, characterized in that: The sensor antenna is soldered on the annular PCB.

7. A temperature measuring plug for a high voltage cable, characterized in that: The temperature measurement module communicates wirelessly, and is characterized in that the acquisition antenna is used to communicate with the sensor chip.

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