CN205079885U - Power cable and equipment connect wireless temperature measuring device - Google Patents

Abstract

The utility model discloses a wireless temperature measuring device for power cables and equipment joints, which comprises an upper cover, a lower cover, a coil, a magnetically conductive fastener, and a coil frame. A control board is placed inside the cover, one side of the control board is connected with a wire, the wire passes through the lower cover, and the end of the wire is connected with a temperature probe, the control board is equipped with a super capacitor, a low-power single-chip microcomputer, and a wireless transmission module; the coil There is a coil on the frame, and a magnetic fastener is provided at the opening of the coil. The coil and the magnetic fastener are fastened together by screws. groove so that the coil is placed between the groove of the upper cover and the groove of the lower cover. The control board of the utility model adopts CT to take power and add supercapacitor to ensure power supply to the low-power single-chip microcomputer and wireless transmitting module. The special soft magnetic strip makes the induction electric field stronger. service life.

Description

Wireless temperature measuring device for power cables and equipment joints

technical field

The utility model relates to a wireless temperature measuring device for power cables and equipment joints.

Background technique

When the power equipment is working, the normal heating of each component should not exceed its maximum allowable temperature, so as to ensure safe operation. On-line temperature monitoring of the operating status of power equipment can detect equipment abnormalities in time and take measures to avoid accidents. Poor electrical contact conditions at the conductive connections and sockets of electrical equipment are important reasons for excessive temperature at these locations. Therefore, the connection and socket are the main parts of online monitoring.

There are mainly three existing temperature monitoring methods: fiber Bragg grating temperature measurement method, infrared temperature measurement method and battery wireless temperature measurement method. In terms of power supply and transmission methods, the fiber grating temperature measurement method does not require power supply and optical fiber transmission, the infrared temperature measurement method does not require power supply and wireless transmission, and the battery wireless temperature measurement method requires battery power supply/wireless transmission; in terms of temperature measurement accuracy, fiber Bragg grating measurement method The temperature method has high precision, the infrared temperature measurement method has poor accuracy, and the battery wireless temperature measurement method is in between; in terms of stability, the fiber grating temperature measurement method has a low stability for long-term use, and the infrared temperature measurement method is extremely low. It is easily affected by light, airflow, dust, etc., and the battery wireless temperature measurement method has good stability; in terms of security, the fiber grating temperature measurement method is generally safe and is easily affected by dust, while the infrared temperature measurement method has high security, and the battery There are security risks in wireless temperature measurement.

Therefore, there is a need for a temperature detection device with good comprehensive performance, safety, reliability, accuracy and real-time power cables and equipment joints.

Utility model content

The purpose of the invention of the utility model is to provide a wireless temperature measuring device for power cables and equipment joints in view of the above existing problems.

The technical scheme that the utility model adopts is such:

A wireless temperature measuring device for power cables and equipment joints, including an upper cover, a lower cover, a coil, a magnetically conductive fastener, and a coil frame. board, one side of the control board is connected with wires, the wires pass through the lower cover, and the ends of the wires are connected with temperature probes, the control board is provided with supercapacitors, low-power single-chip microcomputers, and wireless transmitting modules; the coil skeleton There is a coil on the top, and a magnetic fastener is provided at the opening of the coil. The coil and the magnetic fastener are fastened together by screws. Match the groove so that the coil is placed between the groove of the upper cover and the groove of the lower cover.

Preferably, the coil is a soft magnetic strip, and the current range of the induction primary side adapted by the soft magnetic strip is 7A-4500A.

Preferably, both the upper cover and the lower cover are flame-retardant covers.

Preferably, a shielding cover and a protection circuit are provided on the control board, and the protection circuit is composed of a TVS tube, a piezoresistor and a fuse.

Preferably, the temperature probe is an epoxy temperature probe.

Preferably, two annular portions are respectively provided on both sides of the lower cover.

In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

1. The utility model is simple in structure and reasonable in design. The fixing method of the soft magnetic strip can greatly improve the efficiency of construction personnel, and at the same time it is simple and easy to operate; the temperature probe is sealed with epoxy plastic, which ensures the service life of the probe and enables it to adapt to Harsh environment (such as acid-base environment, dust environment, humid environment, etc.), and small size, easy to install some places with small gaps or small temperature-sensing points; Power supply to low-power single-chip microcomputer and wireless transmission module.

2. The custom-made CT power-taking coil skeleton of the utility model makes the power-taking function more perfect, and conducts induction power-taking through the primary current flowing on the cable or busbar, and has super power-taking performance; at the same time, the special soft magnetic strip makes it The ability to induce electric field is stronger, as long as there is 7A or 9A primary current on the cable or switchgear busbar, the passive module can work normally.

3. The passive wireless temperature measurement module of the utility model is small in size and easy to install. It is suitable for cables and busbars of various sizes. It can be installed on the inside or outside of the sleeve of the contact arm and can be installed in various positions on the busbar. , There are more choices, and the installation is more convenient and quick.

4. The power sensed by the primary current of the utility model ranges from 0.4mW of 3A to 80mW of 5000A. Since the power sensed by itself is small, it does not need to consume much energy through the protection circuit, which is more stable; a shielding cover is set on the control board , shielding structure design, good anti-interference, can easily deal with the interference caused by group pulse and surge.

5. The utility model is provided with two annular parts on both sides of the lower cover, through which the cable tie passes, and then bound to the object to be tested. The double cable tie structure makes installation more convenient.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a structural representation of an embodiment of the utility model;

Marks in the figure: 1-upper cover, 2-lower cover, 3-epoxy temperature probe, 4-control board, 5-supercapacitor, 6-soft magnetic strip, 7-magnetic fastener, 8-coil skeleton.

detailed description

Now in conjunction with accompanying drawing, the utility model is described in further detail. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the configurations related to the utility model.

As shown in Figure 1, a wireless temperature measuring device for power cables and equipment joints includes an upper cover 1, a lower cover 2, a soft magnetic strip 6, a magnetically conductive fastener 7, and a coil bobbin 8. The upper cover 1 and the lower cover The cover 2 is matched and clamped together, wherein, the upper cover 1 and the lower cover 2 are made of flame-retardant and high-temperature-resistant materials at one time, and the two sides of the lower cover 2 are respectively provided with two annular parts. Control board 4, one side of the control board 4 is connected with wires, the wires pass through the lower cover 2, and the end of the wires is connected with an epoxy temperature probe 3, the control board 4 is provided with a supercapacitor 5, a low-power single-chip microcomputer , a wireless transmitting module, the control board 4 is also provided with a shielding cover and a protection circuit, the protection circuit is composed of a TVS tube, a varistor, and a fuse, and the control board 4 adopts a professional RF wiring design, which has strong anti-interference ability , the signal sending and receiving ability is better.

The coil frame 8 is provided with a soft magnetic strip 6, the current range of the induction primary side that the soft magnetic strip 6 adapts to is 7A-4500A, the opening of the soft magnetic strip 6 is provided with a magnetically conductive fastener 7, and the soft magnetic strip 6 There are screw holes on the magnetic fastener 7, and the soft magnetic strip 6 and the magnetic fastener 7 are fastened together through the screw holes through screws. The upper cover 1 and the lower cover 2 are provided with the same The shape and width of the soft magnetic strip 6 are adapted to the groove, so that the soft magnetic strip 6 is placed between the groove of the upper cover 1 and the groove of the lower cover 2 .

Working principle of the utility model:

The wireless temperature sensor takes power from the CT through the primary current flowing through the cable, and then supplies the power to the supercapacitor on the PCB for charging. When the supercapacitor is full, it can supply power to the main chip and the transmitting module; at the same time, our company uses The direct measurement method, that is, the temperature probe is closely attached to the measured target point, so that the test data can be obtained more intuitively and accurately; the test data will be sent to the receiving terminal through the main chip at regular intervals. When the temperature is stable, the data transmission frequency will change. Slow, reducing the overall power consumption of the product. When the temperature changes rapidly or the temperature is too high, the data sending frequency will increase, which better reflects the real-time temperature curve of the measured target;

The coil of the wireless temperature measuring device of the utility model adopts special soft magnetic material, which produces little heat and has no temperature influence on the monitoring point under the high current of 4000A. The heat is very large, which will increase the temperature of the monitoring point. The scope of application of the utility model: it can monitor the temperature of joints, contacts, and incoming and outgoing lines of high-voltage and high-current equipment such as busbars, isolating switches, switch cabinets, ring network cabinets, and circuit breakers in real time, and can also monitor the temperature of cables The surface temperature of the incoming line is collected and analyzed, and the actual temperature and temperature curve trend of the cable are judged, which greatly reduces the occurrence of accidents.

Inspired by the above-mentioned ideal embodiment according to the utility model, and through the above-mentioned description content, relevant staff can completely make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

Claims (7)

1. A wireless temperature measuring device for power cables and equipment joints, characterized in that it includes an upper cover, a lower cover, a coil, a magnetically conductive fastener, and a coil bobbin, and the upper cover and the lower cover are matched and snapped together, A control board is placed inside the lower cover, one side of the control board is connected with a wire, the wire passes through the lower cover, and a temperature probe is connected to the end of the wire, and the control board is equipped with a supercapacitor, a low-power single-chip microcomputer, a wireless transmitter module; the coil frame is provided with a coil, and the opening of the coil is provided with a magnetic fastener, and the coil and the magnetic fastener are fastened together by screws, and the upper cover and the lower cover are provided with coils The shape and width of the groove match, so that the coil is placed between the groove of the upper cover and the groove of the lower cover. 2. The wireless temperature measuring device for power cables and equipment joints according to claim 1, wherein the coil is a soft magnetic strip. 3. The wireless temperature measuring device for power cables and equipment joints according to claim 1, characterized in that both the upper cover and the lower cover are flame-retardant covers. 4. The wireless temperature measuring device for power cables and equipment joints according to claim 1, wherein the control board is provided with a shielding cover and a protection circuit, and the protection circuit is composed of a TVS tube, a piezoresistor and a fuse . 5. The wireless temperature measuring device for power cables and equipment joints according to claim 1, wherein the temperature probe is an epoxy temperature probe. 6. The wireless temperature measuring device for power cables and equipment joints according to claim 2, characterized in that the current range of the induction primary side adapted by the soft magnetic strip is 7A-4500A. 7. The wireless temperature measuring device for power cables and equipment joints according to claim 1, characterized in that, two annular parts are respectively provided on both sides of the lower cover.