Passive wireless temperature stress sensor for isolation switch

Abstract

The present invention provides a passive wireless temperature stress sensor applied to an isolation knife switch, comprising: an isolation knife switch contact finger base, an isolation knife switch contact finger, an antenna, a sensor base, a temperature stress sensitive element, a signal port, and a signal transmission line; the temperature stress sensitive element and the signal port are arranged together on the inclined surface of the sensor base; the sensor base is assembled at the root of the isolation knife switch contact finger; the sensor detection signal is transmitted to the antenna through the signal port and the signal transmission line, and is emitted in the form of electromagnetic waves through the antenna; the antenna is installed on one side of the isolation knife switch contact finger base. The passive wireless temperature stress sensor applied to the isolation knife switch provided by the present invention has excellent antenna performance, is easy to process, and has excellent temperature stress sensitive element performance. It can send temperature stress sensing data through the antenna with sufficient power using electromagnetic wave signals so that the reading device can stably receive and analyze it.

Description

Technical Field

[0001] The invention relates to the technical field of temperature stress sensors, and in particular to a passive wireless temperature stress sensor applied to an isolation knife switch. Background Art

[0002] The isolating knife switch is the most commonly used electrical appliance among high-voltage switchgear. Its working principle and structure are relatively simple, but due to its large usage and high requirements for working reliability, it has a great impact on the design, establishment and safe operation of substations and power plants. Generally, various sensors are installed on the isolating knife switch to monitor its working status.

[0003] In view of the problems that the existing temperature sensors on the market have complex structures and are inconvenient to process and assemble, the prior art continues to provide a temperature pressure sensor detection antenna applied to an isolation knife switch.

[0004] Sensors that detect temperature or stress separately are common in the market. Common temperature sensors generally use infrared technology, thermocouple technology, etc., while common stress sensors generally use strain gauge technology. The above two types of sensors belong to different technical fields and generally cannot be integrated. However, in some special occasions, such as the power field, it is necessary to monitor the temperature data of the equipment during operation in real time, as well as the contact effect of the contact parts of the power equipment, especially the closing effect detection of the knife switch. This field is still blank.

[0005] Patent document CN105716734B discloses a temperature sensor device and a corresponding method. The temperature sensor may include a first layer that is essentially non-conductive within a temperature range and a second layer that has a variable resistance within the temperature range. This patent does not solve the problem of existing temperature sensors, which are complex in structure and inconvenient to process and assemble.

[0006] In the Chinese patent document with publication number CN204556133U, an online temperature monitoring system for outdoor isolation knife switch is disclosed, which includes a surface acoustic wave temperature sensor, an antenna, a temperature collector and a cable; the surface acoustic wave temperature sensor is installed at the temperature measurement point of the outdoor knife switch, and is provided with one, two or more; the antenna is wirelessly connected to the surface acoustic wave temperature sensor; the temperature collector is connected to the antenna through a cable. This patent cannot solve the problem of inconvenient processing and assembly of existing temperature sensors. Summary of the invention

[0007] In view of the defects in the prior art, an object of the present invention is to provide a passive wireless temperature stress sensor applied to an isolation knife switch.

[0008] According to the present invention, a passive wireless temperature stress sensor applied to an isolation knife switch includes: an isolation knife switch contact finger base, an isolation knife switch contact finger, an antenna, a sensor base, a temperature stress sensitive element, a signal port and a signal transmission line;

[0009] The temperature stress sensitive element and the signal port are arranged together on the inclined surface of the sensor base;

[0010] The sensor base is mounted at the root of the isolation switch contact finger;

[0011] The sensor detection signal is transmitted to the antenna through the signal port and the signal transmission line, and is emitted in the form of electromagnetic waves through the antenna;

[0012] The antenna is installed on one side of the isolation knife switch contact base.

[0013] Preferably, the temperature stress sensitive element adopts a "pin"-shaped layout structure.

[0014] Preferably, the signal port and the signal transmission line are electromagnetic wave signal inlet and outlet channels, connecting the temperature stress sensitive element and the antenna.

[0015] Preferably, the antenna is impedance matched with the temperature and pressure sensitive element;

[0016] Preferably, the antenna is mounted on the isolation knife switch contact finger base, with the radiation direction downward.

[0017] Preferably, the antenna comprises: a filling component, a transmitting component and a signal transmission interface;

[0018] The signal transmission line is connected to the transmitting component via a signal transmission interface;

[0019] The filling component fills the inner space of the emitting component and acts as an insulating medium.

[0020] Preferably, the filling component is arranged in the inner space of the transmitting component in a sliding and pulling manner to adjust the antenna impedance.

[0021] Preferably, the filling component is made of insulating material.

[0022] Preferably, the dielectric constant of the filling component is greater than a set threshold.

[0023] Preferably, the signal transmission line is combined with the transmitting component by riveting through a signal transmission interface.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The passive wireless temperature stress sensor for the isolation knife switch provided by the present invention has excellent antenna performance, is easy to process, and has excellent temperature stress sensitive element performance. It can send the temperature stress sensing data through the antenna using an electromagnetic wave signal with sufficient power so that the reading device can stably receive and analyze it.

[0026] 2. The passive wireless temperature stress sensor for use in the isolation knife switch provided by the present invention adopts acoustic wave meter technology and differential technology, and has excellent temperature and pressure accuracy and anti-interference performance.

[0027] 3. The present invention has a reasonable structure, is easy to use, and can overcome the defects of the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0029] Figure 1 The overall structural diagram of the passive wireless temperature stress sensor applied to the isolation switch provided by the present invention;

[0030] Figure 2 Schematic diagram of the working principle of the passive wireless temperature stress sensor module in an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of the structure of an antenna in an embodiment of the present invention;

[0032] Figure 4 It is a schematic diagram of an installation implementation method in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] Isolation knife switch contact finger base 1 Sensor base 4

[0035] Isolation switch contact 2 Temperature stress sensitive element 5

[0036] Antenna 3 Signal port 6

[0037] Filling component 301 Signal transmission line 7

[0038] Transmitter 302 Isolation knife switch contact 8

[0039] Signal transmission interface 303 DETAILED DESCRIPTION

[0040] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several changes and improvements can still be made. These all belong to the protection scope of the present invention.

[0041] The present invention introduces a passive wireless temperature stress sensor applied to a disconnector. Referring to Figure 1-Figure 4 , it includes: a disconnector finger base 1, a disconnector finger 2, an antenna 3, a sensor base 4, a temperature stress sensitive element 5, a signal port 6, and a signal transmission line 7;

[0042] The temperature stress sensitive element 5 and the signal port 6 are arranged together on the inclined surface of the sensor base 4;

[0043] The sensor base 4 is assembled at the root of the disconnector finger 2,

[0044] The detection signal of the sensor is transmitted to the antenna 3 through the signal port 6 and the signal transmission line 7, and the temperature stress data is emitted into free space in the form of electromagnetic waves through the antenna 3 and received and analyzed by a dedicated device;

[0045] The antenna 3 is installed on one side of the disconnector finger base 1.

[0046] Preferably, the two right-angled sides of the sensor base 4 are made of metal, and the inclined surface is a fiberglass board with a certain thickness and copper-clad lines. The sensor base 4 is assembled at the root of the disconnector finger 2. When the disconnector contact 8 is closed, the disconnector finger 2 slightly opens, which can generate a certain mechanical deformation on the inclined surface of the sensor base 4 and is then sensed by the temperature stress sensitive element.

[0047] The temperature stress sensitive element 5 adopts surface acoustic wave technology and differential technology, and the components are arranged in a "pin" shape.

[0048] Preferably, the signal port 6 is connected to the signal transmission line using an SMA interface. The signal transmission line is combined with the transmitting component by riveting through a signal transmission interface. The signal port 6 and the signal transmission line 7 are channels for electromagnetic wave signals to enter and exit, connecting the temperature stress sensitive element 5 and the antenna 3. The antenna 3 includes: a filling component 301, a transmitting component 302, and a signal transmission interface 303;

[0049] The signal transmission line 7 is connected to the transmitting component 302 via the signal transmission interface 303; the filling component 301 is filled in the internal space of the transmitting component 302 and acts as an insulating medium. The filling component 301 is set in the internal space of the transmitting component 302 in a sliding and pulling manner to adjust the impedance of the antenna 3. The filling component 301 is set with an insulating material, and the dielectric constant of the filling component 301 is greater than a set threshold.

[0050] Preferably, the antenna 3 is an aluminum sheet metal part that meets certain shape requirements and can use non-air medium according to circumstances. The antenna 3 is impedance matched with the temperature and pressure sensitive element 5; the antenna 3 is installed on the isolation knife switch contact finger base 1, with the radiation direction downward.

[0051] Preferably, it also includes a standard data analysis component, which is connected to the wireless data acquisition device to receive the temperature stress data transmitted by the antenna 3.

[0052] Specifically, in one embodiment, Figure 1 As shown, the passive wireless temperature stress sensor for isolating knife switch provided by the present invention is composed of a temperature stress sensitive element 5, a sensor base 4, a signal port 6, a transmission line 7, an antenna 3, etc., which are combined in a certain way. Figure 2 As shown, the passive wireless temperature stress sensor is installed at the root of the isolation knife switch contact finger 2 and one side of the isolation knife switch contact finger base 1. Figure 4 As shown, the passive wireless temperature stress sensor applied to the isolation knife switch transmits the temperature stress sensing signal with the wireless data collector through the electromagnetic wave signal. The wireless data collector sends an electromagnetic wave signal of a specific frequency band, and the passive wireless temperature stress sensor receives the electromagnetic wave signal through the sensor antenna, obtains energy, and immediately returns the sensing signal with temperature stress information and sends it out through the sensor antenna in the form of electromagnetic waves. This process is completed in real time, and there is no energy storage process. The above electromagnetic wave signal is received by the wireless data collector and parsed into temperature stress data in a standard data format.

[0053] The passive wireless temperature stress sensor for the isolation knife switch provided by the present invention has excellent antenna performance, convenient processing, and excellent temperature stress sensitive element performance. It can send the temperature stress sensing data through the antenna with an electromagnetic wave signal with sufficient power so that the reading device can stably receive and analyze it. The acoustic meter technology and differential technology are adopted, and it has excellent temperature accuracy and anti-interference performance; the present invention has a reasonable structure and is easy to use, which can overcome the defects of the prior art and fill the gap in the field of temperature stress detection of isolation knife switches.

[0054] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A passive wireless temperature stress sensor applied to an isolation switch, characterized in that: Comprising: Isolating switch finger base (1), isolating switch finger (2), antenna (3), sensor base (4), temperature stress sensitive element (5), signal port (6) and signal transmission line (7); The temperature stress sensitive element (5) and the signal port (6) are arranged together on the inclined surface of the sensor base (4); The sensor base (4) is assembled at the root of the isolating switch finger (2); The two right-angled sides of the sensor base (4) are made of metal, and the inclined surface is a fiberglass board with a certain thickness and copper-clad circuit; the sensor base (4) is assembled at the root of the isolating switch finger (2). When closing the switch through the isolating switch contact (8), the isolating switch finger (2) opens, causing mechanical deformation of the inclined surface of the sensor base (4), which is then sensed by the temperature stress sensitive element; The sensor detection signal is transmitted to the antenna (3) through the signal port (6) and the signal transmission line (7), and is emitted in the form of electromagnetic waves through the antenna (3); The antenna (3) is installed on one side of the isolating switch finger base (1); The temperature stress sensitive element (5) adopts surface acoustic wave technology and differential technology, and the components are arranged in a "pin" shape; The signal port (6) and the signal transmission line (7) are channels for electromagnetic wave signals to enter and exit, connecting the temperature stress sensitive element (5) and the antenna (3); The antenna (3) is impedance-matched with the temperature pressure sensitive element (5).

2. The passive wireless temperature stress sensor for use with an isolation switch according to claim 1 is characterized in that: The antenna (3) is installed on the isolating switch finger base (1), and the radiation direction is downward.

3. The passive wireless temperature stress sensor for use in an isolation switch according to claim 1 is characterized in that: The antenna (3) includes: filling component (301), transmitting component (302) and signal transmission interface (303); The signal transmission line (7) is connected to the transmitting component (302) via the signal transmission interface (303); The filling component (301) fills the internal space of the transmitting component (302) and acts as an insulating medium.

4. The passive wireless temperature stress sensor applied to the isolation switch according to claim 3 is characterized in that: The filling component (301) is arranged in the internal space of the transmitting component (302) in a sliding and pulling manner to adjust the impedance of the antenna (3).

5. The passive wireless temperature stress sensor applied to the isolation switch according to claim 3 is characterized in that: The filling component (301) is made of insulating material.

6. The passive wireless temperature stress sensor applied to the isolation switch according to claim 3 is characterized in that: The dielectric constant of the filling component (301) is greater than the set threshold.

7. The passive wireless temperature stress sensor applied to the isolation switch according to claim 3 is characterized in that: The signal transmission line (7) is combined with the transmitting component through riveting through the signal transmission interface (303).

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