KR102283300B1 - Terminal thermal detecting apparatus - Google Patents

Abstract

A terminal versus temperature measuring instrument according to the present invention comprises: a metal material heat conduction pad tightly fastened to an electric power cable terminal; an insulation pad fixed to one end of the heat conduction pad; a heat detection sensor electrically insulated from the heat conduction pad by the insulation pad and disposed adjacent to one end of the heat conduction pad to detect a heat generated from the heat conduction pad; and a connector electrically connected to the heat detection sensor. Therefore, the present invention is capable of more effectively preventing fires from starting.

Description

Terminal block thermometer and device including the same {TERMINAL THERMAL DETECTING APPARATUS}

The present invention relates to a device for detecting the heat of a terminal to which power is wired in a device such as an earth leakage breaker or a wiring breaker.

In general, since the voltage of electricity entering a house or factory is a high voltage of three-phase 22,900V, it is lowered to a single-phase 200V low voltage through a switchboard and then distributed to each element. Since high-voltage current is drawn in and out of the switchgear, a safety device is provided, such as tripping the switchgear circuit breaker, in order to prevent a fire hazard due to arc generation. The risk of fire in the switchgear is not only due to arc generation but also circuit breakage and failure due to the temperature inside the circuit. Ho et al.

Meanwhile, the structure of a general earth leakage breaker 1 is shown in FIG. 1 . The earth leakage breaker 1 includes a connection pad 4 to which a plurality of power cables are connected, and each connection pad 4 and a power cable connected thereto are formed by barrier ribs to prevent interference with neighboring power cables. A separate terminal connection area (2) is provided. Since the earth leakage breaker 1 is small in size, it is not easy to install a separate device to detect a fire that may occur in the earth leakage breaker. For this reason, conventionally, a balco tube using a soft PVC material for insulation and dustproof protection is used. The temperature change of each power cable is sensed using the characteristics of

However, in the case of using the balco tube, it is practically difficult to immediately detect and respond to the heat generation state of the power cable and the occurrence of a fire, since a person must directly check whether the balco tube is discolored with the naked eye. In order to solve this problem, when a circuit breaker equipped with a temperature sensor is used, the cost of replacing the circuit breaker that is already installed is not only incurred, but also products of various standards are required due to the difference in the number of power cables that need to be connected depending on the installation environment. It is difficult to apply in practice.

The present invention is intended to solve the problems of the prior art, and it is possible to detect the heat generated from each of a plurality of power cables without replacing a power distribution device such as an earth leakage breaker installed in the prior art to prevent a fire risk in advance. An object of the present invention is to provide a measuring tool and a terminal block temperature measuring device including the same.

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood from the description below.

Terminal block temperature measuring sphere according to the present invention, a thermal conductive pad made of a metal material that is tightly fastened to the power cable terminal; an insulating pad fixed to one end of the heat conduction pad; a thermal sensor electrically insulated from the thermal conduction pad by the insulating pad and disposed adjacent to one end of the thermal conduction pad to detect heat generated from the thermal conduction pad; It may be configured to include; a connector electrically connected to the thermal sensor.

Here, the heat conduction pad is characterized in that an opening capable of being fastened to the fastening bolt together with the power cable terminal is formed.

The insulating pad is characterized in that it is formed of a printed circuit board on which wiring for electrically connecting the connector and the thermal sensor is formed.

The heat conduction pad and the insulating pad are disposed to be perpendicular to each other.

One end of the heat conduction pad and one end of the insulating pad are formed in a concave-convex structure including protrusions and recesses, respectively, and are interlocked with each other.

The thermal sensor is characterized in that it is disposed on the protrusion of the concave-convex structure formed on the one end of the insulating pad.

In another aspect, the terminal block temperature measuring device according to the present invention, together with the plurality of terminal block temperature measuring spheres, a plurality of plugs fastened to the connector provided in each of the terminal block temperature measuring spheres; It may be configured to include; a temperature calculation module for calculating the temperature information of the corresponding power cable based on the sensing information collected from the thermal sensor provided in each of the plurality of terminal block temperature measuring spheres.

Furthermore, the terminal block temperature measuring device according to the present invention may further include a communication module for transmitting the temperature information calculated by the temperature calculation module to the outside.

By using the terminal block temperature measuring device according to the present invention, it is possible to more effectively prevent the occurrence of a fire by detecting the heat generated by each power cable connected to the circuit breaker while using the existing circuit breaker as it is. In particular, by using the terminal block temperature measuring device according to the present invention, since the temperature change of each of the plurality of power cables connected to the circuit breaker can be observed in real time, it is possible to immediately determine the power cable exhibiting an abnormal temperature change.

1 is a perspective view showing an example of a conventional earth leakage breaker.
2 is a schematic diagram showing a state in which the terminal block temperature measuring tool according to the present invention is installed in a conventional earth leakage breaker.
3 is a perspective view showing a terminal block temperature measuring tool according to the present invention.
4 is a schematic diagram showing the configuration of a terminal block temperature measuring device according to the present invention.
5 is an image showing an example of a bad crimping of a power cable terminal that caused a fire.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail through the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. In addition, numbers (eg, first, second, etc.) used in the description process of the present specification are only identification symbols for distinguishing one component from other components.

Hereinafter, detailed contents for practicing the present invention will be described with reference to the accompanying drawings.

2 is a schematic diagram showing a state in which the terminal block temperature measuring tool 100 according to the present invention is installed in the conventional earth leakage breaker 10. As shown in FIG. The earth leakage breaker 10 includes a connection pad 40 to which the terminal 51 of the power cable 50 can be fastened, and the terminal connection area 20 to which each terminal 51 is fastened is located on the partition wall 30 . separated by There is a very narrow interval between the partition wall and the partition wall, but the terminal block temperature measuring tool 100 manufactured to a size that can be installed in the terminal connection area 20 where the terminal 51 is installed is installed at one end of the power cable 50 . It can be fixed to the connection pad 40 through the fastening bolt 60 together with the (51).

The inventor of the present invention studied the cause of fire in the conventional earth leakage breaker, and found that the main cause was a defect in the crimping state of the wire and the terminal of the power cable. That is, in the case of power cable self-heating, overcurrent caused by grounding or short-circuit, increase in contact resistance due to defective conductor connection, and ignition due to insulation breakdown due to insulation deterioration cause In particular, as shown in FIG. 5 , when the compression state between the terminal and the computer bundle is poor, heat is generated in the wire bundle by vibration, thereby causing a fire. In addition, even when the bolts between the terminal and the connection pad are poorly tightened, heat may be generated due to vibration, which may cause a fire. That is, overheating of the circuit breaker itself may be the cause, but the main cause is in the terminal area of each power cable. Therefore, sensing only the temperature of the circuit breaker body itself is insufficient for fire prevention. Since heat is "H=I ² RT" (H is heat quantity, I is current, R is resistance, T is time), it is proportional to the square of the current and time in case of overload or dielectric breakdown. Therefore, heat generated from the power cable must be directly sensed to effectively respond to heat and ignition occurring in an instant.

To this end, the terminal block temperature measuring device 100 is, as shown in FIG. 3 , a metal heat-conducting pad 110 that is tightly coupled to the power cable terminal 51 , and one end of the heat-conducting pad 110 . The insulating pad 120 and the insulating pad 120 are electrically insulated from the heat conducting pad 110 and disposed adjacent to one end of the heat conducting pad 110 to dissipate the heat generated by the heat conducting pad 110 . It is configured to include a thermal sensor 130 for sensing, and a connector 140 electrically connected to the thermal sensor 130 .

Here, the thermal conductive pad 110 is preferably formed of a metal material having excellent thermal conductivity, and more preferably, may be formed using a metal such as copper having excellent thermal conductivity and electrical conductivity. An opening 113 that can be fastened to the fastening bolt 60 together with the power cable terminal 51 may be formed in the heat conduction pad 110 , and the opening 113 is preferably formed like a circular through hole shown in FIG. 3 . However, its shape and shape can be variously deformed.

The thermal sensor 130 may use, for example, a thermistor as a means for sensing the heat generated by the thermal conductive pad 110 . A thermistor is a resistance element that has a greater change in resistance with temperature than normal resistance, and is also called a thermosetting resistor. There is a PTC thermistor (Positive Temperature Coefficient Thermistor), which increases resistance as the temperature increases, and NTC thermistor (Negative Temperature Coefficient Thermistor), which decreases resistance as the temperature increases. In addition, various temperature sensors that detect a change in temperature due to heat generated by the heat conduction pad 110 and generate an electrical signal may be used.

In particular, the thermal sensor 130 may be disposed adjacent to one end of the thermal conductive pad 110 at one edge of the insulating pad 120 . In particular, the thermal sensor 130 is disposed to be electrically insulated from the thermal conductive pad 110 by the insulating pad 120 provided on one side of the thermal conductive pad 110 . An alternating current flows in the heat conduction pad 110 that is closely attached to the terminal 51 of the power cable 50 , and the thermal sensor 130 conducts a direct current by the circuit module 200 , so it detects heat. The sensor 130 and the thermal conductive pad 110 should be insulated by the insulating pad 120 . That is, in order to improve the sensitivity to heat generated by the heat-conducting pad 110 , the thermal sensor 130 is disposed as close as possible to the heat-conducting pad 110 , while preventing a short circuit with the alternating current flowing through the heat-conducting pad 110 . In order to do this, the thermal sensor 130 must be disposed in a state insulated from the thermal conductive pad 110 by the insulating pad 120 . One or more thermal sensors 130 may be installed as needed.

In addition, the insulating pad 120 may be formed in a predetermined area on one side of the thermal conductive pad 110 . In particular, after the insulation pad 120 is manufactured in the form of a panel having a predetermined size, it may be fixed to one end of the heat conduction pad 110 , and it is preferable that the insulation pad 120 and the heat conduction pad 110 be disposed perpendicular to each other. The terminal connection area 20 provided in the circuit breaker 10 is formed in a very narrow space, and the plug 230 and the connector 140 for electrically connecting the thermal sensor 130 to the circuit module 200 are mutually connected. It is preferable that the area to be connected is disposed as far as possible from the fastening area of the terminal 51 of the power cable and the heat conduction pad 110 . One edge of the insulating pad 120 may be fixed to one edge of the thermal conductive pad 110 in a manner such as soldering. Notwithstanding (20), it is easy for an operator to install the terminal block temperature measuring tool 100 while the connection area of the plug 230 and the connector 140 does not interfere with the fastening area of the power cable terminal 51 .

The thermal sensor 130 may be disposed on one side of the insulating pad 120 adjacent to the thermal conductive pad 110 , and the connector 140 may be disposed on the other side opposite to the insulating pad 120 . The connector 140 is a means for electrical connection with the plug 230 extending from the circuit module 200 , and is electrically connected to the thermal sensor 130 . In this case, the insulating pad 120 is preferably formed of a printed circuit board having a predetermined wiring therein.

On the other hand, in order to strengthen the coupling between the insulating pad 120 and the heat conductive pad 110 , it is more preferable that the edges of both sides are formed in a concave-convex structure capable of interlocking with each other. That is, as shown in FIG. 3 , the protrusions 111 and 112 constituting the first concave-convex structure are formed at one end of the heat conduction pad 110 , and the second concave-convex structure is formed at one end of the insulating pad 120 . The protrusion 121 and the concave portion 121 are formed, and after the occlusion of the first concave-convex structure and the second concave-convex structure, when the heat conduction pad 110 and the insulating pad 120 are combined by a method such as soldering, the structure becomes more robust. configurable. At this time, in order for the thermal sensor 130 to more effectively respond to the heat generated by the thermal conductive pad 110 , the thermal sensor 130 has a protrusion 121 having a second concave-convex structure formed at one end of the insulating pad 120 . It is more preferable to be placed in In particular, when the thermal sensor 130 is disposed on the protrusion 121 of the second concave-convex structure sandwiched between the two adjacent concave portions 112 of the first concave-convex structure, the three surfaces are surrounded by the heat conduction pad 110 . In this state, the thermal sensor 130 can more effectively respond to the heat of the thermal conductive pad 110 .

In a state in which one-to-one terminal block temperature measuring devices 100 are installed corresponding to the plurality of power cables 50 connected to the circuit breaker, each terminal block temperature measuring device 100 is connected to a circuit module by a connector 140 and a plug 230 . (200) is connected. The circuit module 200 is a temperature calculation module for calculating temperature information for the corresponding power cable 50 based on the sensing information collected from the thermal sensor 130 provided in each of the plurality of terminal block temperature measuring spheres 100 . (210). That is, based on the sensing information (eg, the resistance value of the thermistor) of the thermal sensor 130 collected through the terminal block temperature measuring tool 100 to which the plug 230 having a predetermined identification position is connected, at the corresponding power cable terminal temperature can be calculated. In addition, it may further include a communication module 220 for transmitting the temperature information for each of the heat sensor calculated by the temperature calculation module 210 to the outside. Here, the communication module 220 may communicate with the external management terminals 310 and 320 through a wired or wireless communication network. The management terminals 310 and 320 may display temperature changes for each of the plurality of power cables through the temperature information corresponding to each power cable received from the communication module 220 . Therefore, the manager can check the temperature change of each power cable in real time through his/her management terminal without directly observing the circuit breaker.

Although the preferred embodiments of the present invention have been described so far, those of ordinary skill in the art to which the present invention pertains will be able to implement in a modified form within the scope without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention described herein should be considered from an illustrative rather than a restrictive standpoint, and the scope of the present invention is indicated in the claims rather than in the above description, and all differences within the equivalent scope are the present invention. should be construed as being included in

Claims (8)

A terminal block temperature measuring device of a ground fault circuit breaker formed by separating a terminal connection area provided with a plurality of connection pads to which terminals of a power cable are fastened by a partition wall,
a heat conduction pad made of a metal material having an opening capable of being fastened to the fastening bolt together with the power cable terminal and tightly fastened to the power cable terminal;
an insulating pad fixed to one end of the heat conduction pad;
a thermal sensor electrically insulated from the thermal conduction pad by the insulating pad and disposed adjacent to one end of the thermal conduction pad to detect heat generated from the thermal conduction pad; and
a connector electrically connected to the thermal sensor; and
The insulating pad is formed of a printed circuit board on which wiring for electrically connecting the connector and the thermal sensor is formed,
One end of the heat-conducting pad and one end of the insulating pad are formed in a concave-convex structure including protrusions and recesses, respectively, and are interlocked, so that the insulating pad is disposed to be perpendicular to the heat-conducting pad, wherein the insulating pad is disposed with respect to the heat-conducting pad arranged to extend upward,
The thermal sensor is disposed on the protrusion of the concave-convex structure formed on the one end of the insulating pad, and the connector is disposed on the other end opposite to the one end of the insulating pad, the terminal block temperature measuring tool.
delete delete delete delete delete A plurality of terminal block temperature measuring spheres according to claim 1;
a plurality of plugs coupled to the connectors provided in each of the plurality of terminal block temperature measuring spheres;
A terminal block temperature measuring device comprising a; a temperature calculation module for calculating the temperature information for the corresponding power cable based on the sensing information collected from the thermal sensor provided in each of the plurality of terminal block temperature measuring spheres.
8. The method of claim 7,
Terminal block temperature measuring device, characterized in that it further comprises a communication module for transmitting the temperature information calculated by the temperature calculation module to the outside.

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