JP2020057482A - Detection system and electric outlet - Google Patents

Abstract

To provide a detection system capable of improving the reliability regarding the contact state between conductors.SOLUTION: At least part of the detection system is disposed at the first side to which the electric power is supplied or at the second side which receives the supply of the electric power. A first conductor C1 at the first side and a second conductor C2 at the second side are in contact with each other to form an electric path L1 of the electric power. The detection system includes a detection part. The detection part performs at least one of supply cutoff and resistance value notification on the basis of the resistance value for contact point P1 between the first conductor C1 and the second conductor C2.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates generally to detection systems and outlets. More particularly, the present disclosure relates to a detection system arranged on a power supply side or a power supply side, and an outlet including the detection system.

  Patent Literature 1 describes a power cord including a cutoff device. The power cord is provided with a plurality of blades inserted into and connected to the blade insertion port of the power outlet, and at least one for each blade, and two PTC thermistors for detecting the temperature of the corresponding blade. And a plug having: Further, the power cord includes a load connection portion connected to the load. Then, even when only the temperature of one of the PTC thermistors rises, safety can be improved by turning off the power supply from the blade to the load connection portion by the cutoff device.

JP-A-2015-115264

  By the way, one of the causes of the abnormal temperature rise in the plug or the power outlet is poor contact between the plug blade and the blade receiver (between the first conductor and the second conductor). Then, it is desired to detect the contact state between the first conductor and the second conductor with higher accuracy.

  The present disclosure has been made in view of the above circumstances, and it is an object of the present disclosure to provide a detection system and an outlet that can improve reliability regarding a contact state between conductors.

  The detection system according to an aspect of the present disclosure is arranged, at least in part, on a first side that supplies power or a second side that receives the supply of power. The first conductor on the first side and the second conductor on the second side are in contact with each other to form an electric path for the power. The detection system includes a detection unit. The detection unit performs at least one of cutoff of the supply and notification of the resistance value based on a resistance value at a contact point between the first conductor and the second conductor.

  An outlet according to an aspect of the present disclosure includes the detection system described above, the first conductor contacted by the second conductor, and a housing accommodating at least the first conductor.

  According to the present disclosure, there is an advantage that reliability regarding a contact state between conductors can be improved.

FIG. 1 is a block diagram illustrating a configuration of an outlet including a detection system according to an embodiment of the present disclosure. FIG. 2A is an external perspective view showing an example of use of the above outlet when the opening and closing unit is in a conductive state. FIG. 2B is an external perspective view showing an example of use of the above outlet when the opening / closing unit is in a shut-off state. FIG. 3 is an exploded perspective view of the outlet. FIG. 4A is a front view of the outlet with the outer cover and the inner cover removed. FIG. 4B is a rear view of the outlet with the outer cover and the inner cover removed. FIG. 5A is a schematic view showing a configuration of a main part of the outlet, corresponding to a cross section taken along line X1-X1 of FIG. 4A. FIG. 5B is a schematic view showing a configuration of a main part of the outlet, corresponding to a cross section taken along line X2-X2 in FIG. 4B. FIG. 6A is a schematic diagram of a detection system of the above in a state where the plug is inserted into the outlet of the above. FIG. 6B is a schematic circuit diagram for explaining the detection system of the above. FIG. 6C is a schematic view showing a state in which the plug has a poor contact. FIG. 7 is a graph for explaining a determination process of the detection system according to the first embodiment. FIG. 8A is a schematic diagram of Modification Example 1 of the detection system of the above. FIG. 8B is a schematic circuit diagram illustrating a first modification of the above embodiment. FIG. 9A is a schematic diagram of a main part of a second modification of the detection system of the above. FIG. 9B is a schematic diagram of a main part of another example of Modification 2 of the above. FIG. 10A is an external view of Modification 4 of the detection system of the above. FIG. 10B is an external view of another example of Modification 4 of the above.

(1) Outline Each drawing described in the following embodiments is a schematic drawing, and the ratio of the size and thickness of each component in each drawing necessarily reflects the actual dimensional ratio. Not necessarily.

  The detection system 6 according to the present embodiment is at least partially disposed on a first side for supplying power or a second side for receiving power supply. The “first side for supplying power” in the present disclosure includes, for example, outlets, switch devices, hooking ceilings, and wiring devices such as table taps that can serve as a port for taking out power from a power supply such as a commercial power supply. Can be In the present disclosure, the relay device, the breaker, and the like also correspond to the “first side for supplying power”. The outlet may be an indoor outlet or an outdoor outlet. For example, the outlet may be an outdoor outlet for EV (Electric Vehicle) charging.

  In addition, the “second side that receives power supply” in the present disclosure includes a plug, a cord, and a load device connected thereto, such as a home electric device or an EV. Hereinafter, these may be collectively referred to as “load resistance”.

  Here, as an example, it is assumed that the entire detection system 6 is arranged on the first side for supplying power. It is assumed that the “first side” is the outlet 1 as shown in FIG. However, as described above, the function of the detection system 6 may be applied to a switch device, a hook ceiling, a power strip, a relay device, a breaker, and the like other than the outlet, or may be applied to a plug, a load device, and the like. Is also good. In short, in the following, the case where the outlet 1 includes the detection system 6 will be described. However, the breaker may include the detection system 6, or the plug connected to the outlet includes a part or all of the detection system 6. You may.

  Here, the first conductor C1 on the first side and the second conductor C2 on the second side come into contact with each other to form the electric power path L1 (see FIG. 6A). Hereinafter, as an example, it is assumed that the first conductor C1 is the connection member 3 (blade receiver) to which the plug 91 is connected, and the second conductor C2 is the plug blade 911 of the plug 91. However, the second conductor C2 is the terminal member 2 to which the power supply line 92 (see FIG. 5B) is connected on the back side of the outlet 1, and the first conductor C1 may be the core 921 of the power supply line 92. . That is, the “first side for supplying power” corresponds to, for example, the power supply line 92 connected to a branch circuit of a distribution board (not shown), and the “second side for receiving power supply”. The outlet 1 may be used.

  The detection system 6 includes a detection unit 60. The detection unit 60 performs at least one of cutoff of supply and notification of the resistance value based on the resistance value of the contact point P1 (see FIG. 6A) between the first conductor C1 and the second conductor C2.

  According to this configuration, since the detection unit 60 performs at least one of cutoff and notification based on the resistance value of the contact point P1, it is possible to improve the reliability of the contact state between the conductors (C1, C2). it can.

(2) Details Next, the detection system 6 and the outlet 1 including the detection system 6 will be described in more detail with reference to FIGS.

(2.1) Overall Configuration The outlet 1 according to the present embodiment is, for example, a wiring device to which a plug 91 (see FIGS. 5A and 6A) of the load device LD1 is connected to supply power to the load device LD1, that is, an outlet. (Outlet). The outlet 1 is installed in, for example, a residential facility such as a detached house or an apartment house, or a non-residential facility such as an office, a store, a school, or a nursing facility. The outlet 1 is installed on a construction surface 100 (see FIG. 2A) such as a wall surface, a ceiling surface, and a floor surface of a facility (building).

  As shown in FIG. 1, the detection system 6 further includes a temperature detection unit 5 and an opening / closing unit M4 in addition to the detection unit 60 described above. As shown in FIG. 1, the outlet 1 further includes a conductor Z <b> 1, a housing 4 (see FIG. 3), an operation member 81, a display unit 82, a buzzer 83, and a switch 84 in addition to the detection system 6. The detection system 6 is, as mentioned above, by way of example, arranged entirely on the first side (as a component of the outlet 1) supplying power.

  2A and 2B are perspective views showing a state in which the outlet 1 is attached to the construction surface 100. FIG. In the present embodiment, the outlet 1 is an embedded wiring device that is mounted on a mounting frame of a large-sized continuous wiring device standardized by Japanese Industrial Standards. Specifically, the outlet 1 is attached to the construction surface 100 via an attachment frame. Here, the mounting frame is fixed to the construction surface 100 via the embedding box or directly. That is, the outlet 1 is attached to the construction surface 100 via the attachment frame by fixing the attachment frame to the construction surface 100. The decorative plate 101 is attached to the mounting frame, and the outlet 1 is exposed from the inside of the decorative plate 101 as shown in FIGS. 2A and 2B. Here, the mounting frame may be separate from the housing 4 of the outlet 1 or may be integrated with the housing 4. In the present embodiment, the case where the outlet 1 is for indoor use, that is, the case where the construction surface 100 is the inner wall surface of a building (facility) will be described. However, the present invention is not limited to this example, and the outlet 1 may be for outdoor use. .

  Hereinafter, a direction perpendicular (orthogonal) to the horizontal plane in a state where the outlet 1 is attached to the inner wall surface of the building which is the building surface 100 is referred to as a “vertical direction”, and the outlet 1 is viewed downward ( (Vertical direction) is described as “downward”. Further, a direction perpendicular to the up-down direction and parallel to the construction surface 100 will be referred to as a “left-right direction”, and the right side as viewed from the front of the outlet 1 will be referred to as “right”, and the left side as “left”. Further, a direction perpendicular to both the up-down direction and the left-right direction, that is, a direction perpendicular to the construction surface 100 is referred to as a “front-rear direction”, and the back side (backside of the wall) of the construction surface 100 is referred to as “rear”. However, these directions are not intended to limit the directions in which the outlet 1 is used. For example, when the outlet 1 is attached to a floor surface instead of a wall surface, the “front-back direction” is a direction perpendicular to a horizontal plane, and the “up-down direction” and “left-right direction” are directions parallel to the horizontal plane. In addition, even when the outlet 1 is mounted on a wall surface, the “left-right direction” is perpendicular to the horizontal plane by mounting the outlet 1 in a direction in which the “vertical direction” is parallel to the horizontal plane (that is, the horizontal direction). Direction.

  In the present embodiment, a two-port type outlet that can simultaneously connect two plugs 91 is exemplified as the outlet 1. That is, the outlet 1 has two connection ports 11 so as to correspond to the two plugs 91. Each of the two connection ports 11 is configured such that one plug 91 can be connected thereto, and is arranged along the vertical direction (vertical direction) on the front surface of the housing 4. Of the two connection ports 11, one (lower) connection port 11 is an outlet with a two-pole grounding electrode for AC 100V, and the other (upper) connection port 11 has no grounding electrode for AC 100V. This is a 2-pole outlet.

  In the present embodiment, the outlet 1 includes a pair of terminal members 2 having opposite polarities so as to correspond to the two-pole plug 91. That is, a power supply line 92 on the L pole (HOT) side is connected to one terminal member 2 of the pair of terminal members 2, and a power supply line 92 on the N pole (COLD) side is connected to the other terminal member 2. You. Similarly, the outlet 1 includes a pair of connection members 3 having different polarities for each connection port 11, and includes a total of two pairs (four) of connection members 3. Here, the two connecting members 3 having the same polarity are connected by a lead plate 30 (see FIG. 3). Further, the connection member 3 and the terminal member 2 having the same polarity are electrically connected to each other via the opening / closing portion M4.

  As described above, here, the connection member 3 (blade receiver) corresponds to the first conductor C1, and the blade 911 of the plug 91 corresponds to the second conductor C2 (see FIG. 6A). Then, the first conductor C1 and the second conductor C2 come into contact with each other to form an electric power path L1.

  The outlet 1 includes a housing 4 and internal components such as a terminal member 2 and a connection member 3 housed or held in the housing 4. The housing 4 includes an outer body 41, an outer cover 42, an inner cover 43, an inner block 44, and a terminal block 45, as shown in FIG. The housing 4 is configured by combining the outer body 41, the outer cover 42, the inner cover 43, the inner block 44, and the terminal block 45. The housing 4 is made of an electrically insulating synthetic resin.

  The outer body 41 is formed in a box shape with an open front surface. The opening surface (front surface) of the outer body 41 has a rectangular shape whose vertical dimension is longer than its horizontal dimension. The inner block 44 is housed in the outer body 41 together with other internal components (such as the terminal member 2 and the opening / closing portion M4) while holding the connection member 3. An inner cover 43 is attached to a front surface of the outer body 41. Thus, between the outer body 41 and the inner cover 43, internal components including the connection member 3 held by the inner block 44 are accommodated. The outer cover 42 is attached to the front of the inner cover 43. Thereby, the connection member 3 is accommodated between the inner block 44 and the outer cover 42. Here, an opening window 431 penetrating in the front-rear direction is formed in a portion of the inner cover 43 corresponding to the inner block 44. Therefore, the front surface of the inner block 44 holding the connecting member 3 is covered by the outer cover 42, and when the outer cover 42 is removed, the front surface of the inner block 44 is exposed forward through the opening window 431. The terminal block 45 is housed in the outer body 41 together with other internal components while holding the terminal member 2.

  That is, the inner block 44 and the outer cover 42 constitute a holding member that holds the connection member 3. The terminal block 45 forms a holding member that holds the terminal member 2. In other words, the outlet 1 further includes a holding member that holds at least one of the terminal member 2 and the connection member 3.

  The outer cover 42 is further configured to be dividable into a plurality of members (for example, three members), but may be integrated (one member). Here, the portion of the outer cover 42 that covers the inner block 44 and the inner block 44 are made of, for example, urea resin.

  The two connection ports 11 described above are formed in a portion of the outer cover 42 that covers the inner block 44. One (upper) connection port 11 of the two connection ports 11 has a pair of insertion holes 111 into which a pair of blades 911 (see FIG. 6A) of the plug 91 are inserted. The other (lower) connection port 11 of the two connection ports 11 has, in addition to a pair of insertion holes 111, a ground insertion hole 112 into which a ground pin of a plug with a ground electrode is inserted, and a ground cover 113. I have. Inside the housing 4, the connection member 3 is disposed at a position corresponding to each insertion hole 111, a first ground member 114 is disposed at a position corresponding to the ground insertion hole 112, and a position corresponding to the ground cover 113. Is provided with a second grounding member 115. The first grounding member 114 is a spring member to which a grounding pin of a plug with a grounding electrode is connected. The second grounding member 115 is a screw terminal to which a ground wire of the electric device is connected. The ground wire can be attached to and detached from the second ground member 115 with the ground lid 113 opened.

  Further, in the space between the outer body 41 and the inner cover 43 and to the left of the inner block 44, an opening / closing portion M4 and a substrate 85 are accommodated. The board 85 is arranged above the opening / closing section M4. A first indicator light 821 and a second indicator light 822 constituting the display unit 82 and a switch 84 are mounted on the board 85. As an example, the first indicator light 821 and the second indicator light 822 are LEDs (Light Emitting Diodes) having different emission colors, and the switch 84 is a push button switch. As described above, the opening / closing unit M4, the display unit 82, and the switch 84 are housed in the housing 4 (the outer body 41 and the inner cover 43). However, the light transmitting portion 432 and the cantilever 433 are provided on the inner cover 43 so that the light of the display unit 82 can be visually recognized from the front of the housing 4 and the switch 84 can be pressed from the front of the housing 4. Is formed. That is, the light of the display unit 82 is visible from the front of the housing 4 through the light transmitting unit 432, and the switch 84 can be pressed from the front of the housing 4 via the cantilever 433. In FIGS. 2A and 2B, for convenience, reference numerals of the display unit 82 and the switch 84 are provided at positions corresponding to the display unit 82 (the first display lamp 821 and the second display lamp 822) and the switch 84 on the front surface of the housing 4. It is attached.

  Further, a sensor board 86 is accommodated in the space between the outer body 41 and the inner cover 43 and at the lower left of the inner block 44, as shown in FIG. 4A. The sensor substrate 86 includes a first measuring unit 601 (voltmeter) and a second measuring unit 602 (Rogowski coil type current sensor, see FIG. 6A) provided in the resistance detecting unit 600 (described later) of the detecting unit 60. The printed wiring board is mounted, and is disposed below the opening / closing section M4. The position of the sensor board 86 in the housing 4 is not particularly limited. The printed wiring board has a through hole penetrating in the thickness direction, and the current sensor is arranged so as to surround the through hole. That is, the current sensor is a board-mounted Rogowski coil that is formed of an air-core coil that does not use a core (coreless) and generates an output according to the current passing through the through-hole.

(2.2) Detection System Hereinafter, the detection system 6 (the detection unit 60, the temperature detection unit 5, and the opening / closing unit M4), and the conductor Z1 (the terminal member 2 and the connection member 3) will be described in detail.

  The detection unit 60 is based on a resistance value R1 (see FIG. 1) regarding a contact point P1 (see FIG. 6A) between the first conductor C1 (the connection member 3) and the second conductor C2 (the plug blade 911 of the plug 91). Thus, at least one of the interruption of the supply and the notification regarding the resistance value R1 is performed. In the present embodiment, the detection unit 60 is configured to perform both blocking and notification.

  Here, the resistance value R1 is, for example, an electrical contact resistance value. The resistance value R1 is a resistance value between the first contact portion 61 (described later) and the second contact portion 62 (see FIG. 6A) of the resistance detection unit 600 in the electric circuit L1.

  The detection unit 60 includes a control unit 7 and a resistance detection unit 600, as shown in FIG.

  The control unit 7 is housed in the housing 4, and is mounted on, for example, a control board disposed behind the inner block 44. Similarly, the buzzer 83 is housed in the housing 4 and mounted on, for example, a control board. The control unit 7 is electrically connected to the opening / closing unit M4, the display unit 82, the buzzer 83, the switch 84, the temperature detection unit 5, and the resistance detection unit 600. The control unit 7 controls at least the opening / closing unit M4, the display unit 82, and the buzzer 83. The resistance detection unit 600 will be described in detail in the section “(2.3) Resistance detection unit”.

  The control unit 7 includes, for example, a microcontroller as a main component. The microcontroller realizes a function as the control unit 7 by executing a program recorded in a memory of the microcontroller by a CPU (Central Processing Unit). The program may be recorded in the memory in advance, may be recorded in a non-transitory recording medium such as a memory card, and may be provided, or may be provided through a telecommunication line. In other words, the program is a program for causing the microcontroller to function as the control unit 7.

  The control unit 7 has a function as a notification unit M3 and a function as a determination unit 73, as shown in FIG.

  When the status information indicates that the outlet 1 is in the specific state, the notification unit M3 notifies that fact. The specific state is, for example, an abnormality or a warning. The notification unit M3 includes a notification unit 71 and a state presentation unit 72. Here, the “state information” of the outlet 1 is information based on the first information (the detected temperature T1) and the second information (the resistance value R1). In the present embodiment, the “state information” is information based on third information (described later) in addition to the first information and the second information.

  The determination unit 73 determines whether the state of the outlet 1 is unconnected, normal, abnormal, or warning based on the detected temperature T1 obtained from the temperature detection unit 5 and the information on the resistance value R1 obtained from the resistance detection unit 600. (First determination process). The control unit 7 generates state information indicating at least one of unconnected, normal, abnormal, and warning based on the determination result of the determination unit 73. In other words, the state information is information indicating that the outlet 1 is in at least one of four states. Here, the four states are, for example, four states: unconnected, normal, abnormal, and warning. is there.

  Here, the graph of FIG. 7 will be described. FIG. 7 is a graph for making the determination process in the determination unit 73 easier to understand. The horizontal axis shows the resistance value R1 [mΩ], and the vertical axis shows the detected temperature T1 [° C.]. In FIG. 7, the first region RX1 is a region in a normal state, the second region RX2 and the third region RX3 are regions in a warning state, and the fourth region RX4, the fifth region RX5, and the sixth region RX6 are abnormal. This is the state area. The seventh region RX7 is a region indicating a state in which the plug 91 is not connected to the outlet 1 (hereinafter, “unconnected state”). It should be noted that a region smaller than a second resistance threshold Rth2 described later belongs to a “connection state” in which the plug 91 is connected to the outlet 1 in any of the normal, abnormal, and warning states.

  Here, when at least the following first condition or second condition is satisfied, the determination unit 73 of the present embodiment performs the shutoff by the opening / closing unit M4. In other words, the determination unit 73 determines that the state is abnormal when at least the first condition or the second condition is satisfied.

  The first condition is that the resistance value R1 is less than the first resistance threshold value Rth1 and the detected temperature T1 is equal to or higher than the first temperature threshold value Tth1. The second condition is that the resistance value R1 is equal to or higher than the first resistance threshold Rth1 and the detected temperature T1 is equal to or higher than the second temperature threshold Tth2. The second temperature threshold Tth2 is set lower than the first temperature threshold Tth1.

  In short, in FIG. 7, if the detected temperature T1 and the resistance value R1 are in any of the fourth area RX4, the fifth area RX5, and the sixth area RX6, it is determined that the state is abnormal. In particular, when the resistance value R1 is less than the second resistance threshold value Rth2, it is determined that there is a high possibility that the plug 91 is connected to the outlet 1 in an abnormal state. If the first condition or the second condition is satisfied, state information indicating an abnormal state is generated. The first resistance threshold Rth1 is, for example, 1 [mΩ]. Note that the second resistance threshold Rth2 in FIG. 7 substantially corresponds to infinity, and “less than the second resistance threshold Rth2” corresponds to a finite value. However, the second resistance threshold Rth2 does not have to correspond to infinity, and may be a specific finite value.

  On the other hand, when the resistance value R1 is less than the first resistance threshold value Rth1 and the third condition that the detected temperature T1 is less than the second temperature threshold value Tth2 is satisfied, the determination unit 73 determines that the state is normal. That is, if the detected temperature T1 and the resistance value R1 are within the first region RX1, it is determined that the plug 91 is normally connected to the outlet 1 and the temperature is also normal (normal state). If the third condition is satisfied, state information indicating a normal state is generated.

  Further, in the present embodiment, when the fourth condition is satisfied, the determination unit 73 determines that the outlet 1 is in the warning state. The fourth condition is that the detected temperature T1 is equal to or higher than the second temperature threshold Tth2 and lower than the first temperature threshold Tth1, and the resistance value R1 is lower than the first resistance threshold Rth1. That is, if the detected temperature T1 and the resistance value R1 are within the third region RX3, it is determined that a warning state has occurred. The determining unit 73 determines that the outlet 1 is in the warning state also when the fifth condition is satisfied. The fifth condition is that the detected temperature T1 is lower than the second temperature threshold Tth2 and the resistance value R1 is equal to or higher than the first resistance threshold Rth1 and lower than the second resistance threshold Rth2 (that is, a finite value). That is, if the detected temperature T1 and the resistance value R1 are within the second region RX2, it is determined that a warning state has occurred. Then, if the fourth condition or the fifth condition is satisfied, status information indicating a warning status is generated.

  When the sixth condition is satisfied, the determination unit 73 determines that the plug 91 is in the unconnected state. The sixth condition is that the detected temperature T1 is lower than the second temperature threshold Tth2 and the resistance value R1 is equal to or higher than the second resistance threshold Rth2 (that is, infinite). That is, if the detected temperature T1 and the resistance value R1 are within the seventh region RX7, it is determined that the connection is normal (the temperature is normal). Then, if the sixth condition is satisfied, state information indicating an unconnected state is generated.

  The presence or absence of the setting regarding the upper limit (the upper limit of the temperature) above the fifth region RX5 and the sixth region RX6 is not particularly limited. Further, the presence or absence of the setting regarding the upper limit (the upper limit of the resistance value) on the right side of the fourth region RX4 and the sixth region RX6 is not particularly limited.

  Here, the determination unit 73 further classifies the warning state as a caution state or a dangerous state. Specifically, when the detected temperature T1 and the resistance value R1 are within the second region RX2 or the third region RX3, the determination unit 73 performs the determination based on the third information (second determination process). The third information is information on at least one of an occurrence frequency at which the outlet 1 enters the warning state and an occurrence period during which the warning state is maintained. Here, it is assumed that the third information is, for example, information on the frequency of occurrence.

  When the determination unit 73 determines that it is in the warning state, it focuses on the fluctuations in the detected temperature T1 and the resistance value R1 received from the temperature detection unit 5 and the resistance detection unit 600, respectively. The detected temperature T1 and the resistance value R1 may change with time according to the status of the outlet 1.

  The determination unit 73 acquires, for example, the detected temperature T1 and the resistance value R1 at intervals of several seconds or several minutes. The determination unit 73 determines that the number of times (occurrence frequency) that the detected temperature T1 and the resistance value R1 are within the second region RX2 or the third region RX3 within a predetermined period is equal to or less than a specified number of times (specified frequency). And state information indicating the attention information. On the other hand, if the number of times that the detected temperature T1 and the resistance value R1 are within the second area RX2 or the third area RX3 within the predetermined period exceeds the specified number (specified frequency), Generates status information indicating danger information. The predetermined period is, for example, a period such as several minutes.

  Alternatively, the determination unit 73 monitors the detected temperature T1 and the resistance value R1, and determines the number of times that the detected temperature T1 and the resistance value R1 enter from outside the second region RX2 or the third region RX3 within a predetermined period. It may be measured as. “Outside the second region RX2 or the third region RX3” is, for example, the first region RX1 indicating normal. For example, due to the rise or fall of the detected temperature T1, there is a possibility that the first region RX1 enters the third region RX3 and the third region RX3 exits the first region RX1 repeatedly. Alternatively, if the connection state of the plug 91 is slightly unstable, the first region RX1 enters the second region RX2 or the second region RX2 exits the first region RX1 due to the rise or fall of the resistance value R1. May be repeated.

  If the measured occurrence frequency is equal to or less than the specified frequency, the determination unit 73 may generate state information indicating attention information. On the other hand, if the measured occurrence frequency exceeds the specified frequency, the determination unit 73 may generate state information indicating danger information.

  When the determination unit 73 determines that the outlet 1 is in the abnormal state, that is, when the state information indicates the abnormal state, the control unit 7 executes the interruption of the electric circuit L1 from the terminal member 2 to the connection member 3. . That is, the control unit 7 outputs a drive signal to the switching unit M4, and controls the switching unit M4 to switch from the conductive state to the cutoff state. The notifying unit 71 of the notifying unit M3 notifies the determination result (abnormal state). That is, the notification unit 71 notifies the user of the detection of the abnormal temperature rise through the buzzer 83 and the display unit 82.

  In the present embodiment, as an example, the notification by the notification unit 71 is realized by outputting an abnormality warning sound from the buzzer 83 and displaying “abnormal” on the display unit 82. That is, the control unit 7 realizes the notification in the notification unit 71 by controlling the buzzer 83 and the display unit 82. The state presenting unit 72 of the notifying unit M3 presents whether the opening / closing unit M4 is in the conducting state or the blocking state. In the present embodiment, as an example, the presentation by the state presentation unit 72 is realized by the output of the abnormality warning sound from the buzzer 83 and the “abnormal” display on the display unit 82. That is, the control unit 7 realizes the presentation by the state presentation unit 72 by controlling the buzzer 83 and the display unit 82.

  On the other hand, when the determination unit 73 determines that the outlet 1 is in the warning state, that is, when the status information indicates the caution information or the danger information, the control unit 7 does not execute the interruption of the electric circuit L1. In other words, the control unit 7 does not output a drive signal to the opening / closing unit M4.

  However, if the status information indicates caution information, the notification unit 71 performs notification (output of a first caution sound different from the abnormal warning sound and “caution” display on the display unit 82). In addition, when the status information indicates danger information, the notification unit 71 performs notification (output of a second warning sound different from the abnormal warning sound and the first warning sound and “danger” display on the display unit 82). . In short, when the status information indicates the caution information or the danger information, the control unit 7 warns the user to check the status of the outlet 1 from the notification unit M3 assuming that it is not a situation in which the electric circuit L1 should be cut off immediately. I do.

  By the way, since the control unit 7 of the present embodiment also performs the determination based on the resistance value R1 as described above, the control unit 7 not only notifies the user that an abnormal temperature rise has been detected, but also detects the connection state of the plug 91. Notify also.

  That is, if the detected temperature T1 and the resistance value R1 are within the fifth region RX5, the control unit 7 executes the cutoff of the electric circuit L1 to notify the abnormal temperature rise, while the plug 91 is further connected normally. Notify that connection is highly likely (connection state). Further, for example, if the detected temperature T1 and the resistance value R1 are within the fourth region RX4 or the sixth region RX6, the control unit 7 executes the cutoff of the electric circuit L1 and notifies about an abnormal temperature rise. At this time, if the resistance value R1 is less than the second resistance threshold value Rth2, the control unit 7 further notifies that there is a high possibility that the plug 91 is connected in an abnormal state (poor connection) (connection state). I do.

  As for the warning state, the control unit 7 also notifies the connection state of the plug 91. The connection state may be notified by changing the emission color of a connection indicator (which may also be used as the display unit 82 or may be provided separately), or may be notified by outputting audio data. Alternatively, the notification may be made by a character display on a display device or the like.

  Further, even if it is determined that the detected temperature T1 and the resistance value R1 are within the seventh region RX7 and the plug 91 is not connected, the control unit 7 may notify that fact. In this case, for example, at first glance, although the plug 91 is connected, an abnormality occurs (for example, a disconnection or a circuit failure) and the detection system 6 considers that the connection is not connected to the user. Can tell.

  As described above, since the detection unit 60 determines the state of the contact point P1 between the first conductor C1 and the second conductor C2 based on the resistance value R1, the user who has received the notification from the outlet 1 It is possible to know that there is a high possibility that the plug 91 has poor contact. Therefore, the reliability regarding the contact state between the conductors (C1, C2) can be further improved.

  In addition, the detecting unit 60 determines the state of the contact point P1 based on the detected temperature T1 in addition to the resistance value R1. Therefore, the user who has received the notification from the outlet 1 can not only know that an abnormal temperature rise has occurred, but also know that the cause is highly likely to be a poor connection of the plug 91. In particular, the temperature threshold for interrupting the electric circuit L1 as an abnormal state may be changed to the first temperature threshold Tth1 or the second temperature threshold Tth2 depending on the magnitude of the resistance value R1. Therefore, the reliability regarding the contact state between the conductors (C1, C2) can be further improved.

  The switch 84 is operated when the sound output of the buzzer 83 is stopped. That is, when the switch 84 is pressed while the buzzer 83 is outputting the abnormal warning sound, the first caution sound, and the second caution sound, the control unit 7 controls the buzzer 83 so that the buzzer 83 is stopped. I do. The switch 84 is also used as a test switch, and is also used when forcibly switching the open / close unit M4 from the conductive state to the cutoff state.

  The opening / closing part M4 is electrically connected between the terminal member 2 and the connection member 3. The opening / closing unit M4 is a device that switches between two states, a conduction state and a blocking state. That is, if the opening / closing section M4 is in a conducting state, the terminal member 2 and the connecting member 3 are electrically connected via the opening / closing section M4. If the opening / closing section M4 is in a blocking state, the terminal member 2 and the connecting member 3 are connected. Is electrically cut off (insulated) by the opening / closing section M4. That is, the electric circuit between the terminal member 2 and the connection member 3 is interrupted by switching the opening / closing part M4 to the interrupted state. The outlet 1 of the present embodiment includes a pair of terminal members 2 having polarities different from each other, and the opening / closing portion M4 is electrically connected to both of the pair of terminal members 2. Therefore, if the opening / closing portion M4 is in the cutoff state, all the two pairs (four) of the connection members 3 are electrically disconnected from the terminal member 2.

  Specifically, the opening / closing section M4 has a pair of contact devices having different polarities and an electromagnetic release device. Each of the pair of contact devices has a fixed contact and a movable contact. The movable contact moves between a closed position in contact with the fixed contact and an open position remote from the fixed contact. The terminal member 2 is electrically connected to the fixed contact, and the connection member 3 is electrically connected to the movable contact. More specifically, the movable contact is provided on the movable contact, and the movable contact is electrically connected to the connection member 3 by connecting the movable contact to the lead plate 30 with a braided wire.

  The opening / closing portion M4 having such a configuration is in a conductive state in which the movable contact is located at the closed position and the terminal member 2 and the connecting member 3 are electrically connected to each other in a steady state. On the other hand, when the opening / closing section M4 receives the drive signal from the control section 7, the opening / closing section M4 activates the electromagnetic release device to drive the movable contact and move the movable contact to the open position, whereby the terminal member 2 and the connection member 3 are moved. Is switched to a cut-off state in which the connection is electrically cut off. As described above, the opening / closing unit M4 is switched from the conductive state to the cutoff state by the drive signal from the control unit 7.

  An operation member 81 is mechanically connected to the opening / closing part M4. The operation member 81 is a lever-type handle rotatable around a rotation axis. Here, a first operation hole 434 and a second operation hole 421 are formed in the inner cover 43 and the outer cover 42, respectively, so that the operation member 81 can be operated from the front of the housing 4. That is, the operation member 81 is exposed to the front of the housing 4 through the first operation hole 434 and the second operation hole 421, and can be operated from the front of the housing 4.

  The operation member 81 rotates in conjunction with the opening / closing portion M4, and moves between an on position (see FIG. 2A) and an off position (see FIG. 2B). The ON position is a position corresponding to the conduction state of the opening / closing section M4, and the OFF position is a position corresponding to the blocking state of the opening / closing section M4. That is, when the opening / closing portion M4 is in the conductive state, the operation member 81 is located at the ON position as shown in FIG. 2A. When the operation member 81 is in the ON position, the front surface of the operation member 81 is substantially flush with the front surface of the housing 4. On the other hand, when the opening / closing section M4 switches from the conducting state to the blocking state, the operating member 81 rotates and the tip of the operating member 81 moves forward (toward the near side), and as shown in FIG. 2B, the operating member 81 is turned off. Move to position. When the operation member 81 is at the off position, the operation member 81 protrudes forward from the front surface of the housing 4.

  As described above, since the operating member 81 and the opening / closing section M4 are interlocked, when the opening / closing section M4 receives a drive signal from the control section 7 and switches the opening / closing section M4 from the conducting state to the blocking state, the operating member 81 becomes Move from on position to off position. Conversely, when the operating member 81 moves from the off position to the on position, the opening / closing portion M4 switches from the blocking state to the conduction state. Therefore, when the user operates the operation member 81 at the off position to move it to the on position, the open / close unit M4 in the cutoff state can be switched to the conductive state. Hereinafter, an operation of moving the operation member 81 from the off position to the on position is referred to as a “restoration operation”.

  Further, in the present embodiment, the opening / closing unit M4 switches from the conducting state to the blocking state not only when receiving the drive signal from the control unit 7 but also when moving the operating member 81 from the ON position to the OFF position. Switch. Therefore, the user can manually switch between the conducting state and the blocking state of the opening / closing section M4 by operating the operation member 81. In other words, the opening / closing unit M4 functions as a switch device that is turned on / off according to the operation of the operation member 81.

  Next, the conductor Z1 (the connection member 3 and the terminal member 2) will be described with reference to FIGS. 4A to 5B.

  Two pairs (four) of the connection members 3 are held by the inner block 44 as shown in FIGS. 4A and 5A. Here, the two pairs of connection members 3 are arranged at positions respectively corresponding to the two pairs of insertion holes 111 formed in the outer cover 42, specifically, at the four corners of the inner block 44 in a front view. Further, as described above, the two connecting members 3 having the same polarity, that is, the two connecting members 3 arranged in the up-down direction are connected by the lead plate 30. Each of the pair of lead plates 30 having different polarities is formed in a strip shape that is longer in the vertical direction than in the horizontal direction. Here, the two connection members 3 and the lead plate 30 having the same polarity are integrally formed from one metal plate. In FIGS. 4A and 5A, a metal plate constituting the connection member 3 and the lead plate 30 is hatched (dot hatching).

  Each connection member 3 is a blade receiving member into which the plug blade 911 of the plug 91 is inserted when the plug 91 is connected. Each connection member 3 is made of a metal having conductivity and elasticity, for example, copper or a copper alloy. Each connection member 3 has a pair of blade receiving pieces 31 facing each other in the left-right direction. Each connecting member 3 is electrically connected to the blade 911 and mechanically holds the blade 911 with the blade 911 sandwiched between the pair of blade receiving pieces 31.

  The pair of terminal members 2 are held by a terminal block 45 as shown in FIGS. 4B and 5B. Here, the pair of terminal members 2 are arranged at positions respectively corresponding to the pair of terminal holes 121 formed on the rear surface of the terminal block 45. Each terminal member 2 is a plug-in type quick connection terminal to which the power supply line 92 is connected by inserting the core wire 921 of the power supply line 92. More specifically, each terminal member 2 has a terminal plate 21 and a locking spring 22, as shown in FIG. 5B. The terminal plate 21 is made of a conductive metal, for example, copper or a copper alloy. The lock spring 22 is made of an elastic metal such as stainless steel. When the power supply line 92 is inserted into the terminal hole 121 opened on the rear surface of the housing 4, each of the terminal members 2 holds the power supply line 92 between the terminal plate 21 and the locking spring 22. , Are electrically connected to the power supply line 92, and mechanically hold the power supply line 92.

  Further, the terminal block 45 holds a ground terminal 116 (see FIG. 4B) for connecting a ground wire. The ground terminal 116 is a plug-in type quick connection terminal similar to the terminal member 2, and is arranged at a position corresponding to the ground terminal hole 122 formed on the rear surface of the terminal block 45. The ground terminal 116 is electrically connected to the first ground member 114 and the second ground member 115 in the housing 4.

  Next, the temperature detection unit 5 (first acquisition unit M1) will be described with reference to FIGS. 5A and 5B. The temperature detector 5 detects, for example, the temperature of the connection member 3 in the conductor Z1 as a detected temperature T1 (see FIG. 1). The temperature detector 5 is housed in the housing 4. The temperature detecting section 5 has a temperature sensor (sensor element) 50 (see FIG. 5A). The temperature sensor 50 is thermally coupled to the connection member 3. The temperature sensor 50 is realized by, for example, a thermistor, a thermocouple, a thermopile, or the like.

  As shown in FIG. 5A, the temperature sensor 50 is disposed on the back side of the lead plate 30 connecting the two connection members 3 to each other, in a state of being thermally coupled to the lead plate 30. The thermal coupling between the temperature sensor 50 and the lead plate 30 is realized, for example, by directly fixing the temperature sensor 50 to the lead plate 30 with a clip or the like. Here, a pair of temperature sensors 50 are provided so as to correspond to a pair of lead plates 30 having different polarities from each other. That is, the temperature detecting section 5 has a pair of temperature sensors 50. Each temperature sensor 50 detects the temperature (detection temperature T1) of the connection member 3 via the corresponding lead plate 30.

  The temperature detector 5 outputs a detection signal (first detection signal) corresponding to the detected temperature T1 detected by the temperature sensor 50 to the controller 7. The first detection signal may be a signal (electric signal) that transmits information corresponding to temperature by a specific code, and for example, a signal in which an electric quantity such as a resistance value, a voltage value, or a current value changes according to temperature. It is. The temperature detection unit 5 may further include a processing circuit that processes an output of the temperature sensor 50 and outputs a first detection signal.

  Note that, as described above, each temperature sensor 50 of the temperature detection unit 5 is disposed in a state of being thermally coupled to the corresponding lead plate 30, and the temperature detection unit 5 is connected to the lead plate 30 (detection point). , The temperature of the connection member 3 is detected as the detected temperature T1. However, the detection point of the detection temperature T1 is not limited to the lead plate 30. For example, the temperature detection unit 5 may detect, as the temperature of the connection member 3, the temperature of a detection point near the contact portion of the connection member 3 and the lead plate 30 with the holding member (the inner block 44 and the outer cover 42). . A gap (space) may be interposed between the detection point and the temperature sensor 50.

  In addition, the temperature detection unit 5 includes a temperature sensor 51 (see FIG. 5B) that is arranged in a state of being thermally coupled to the terminal member 2 of the conductor Z1 instead of or in addition to the temperature sensor 50. May have. The temperature sensor 51 is mounted on a sensor board 511 as shown in FIG. 5B. This is realized by interposing a heat transfer sheet 512 having heat conductivity and electrical insulation between the terminal plate 21 and the temperature sensor 51.

  In short, the number of detection points of the detection temperature T1 may be plural, and the position is not limited as long as it is a temperature corresponding to the conductor Z1.

(2.3) Resistance Detection Unit Next, the resistance detection unit 600 (second acquisition unit M2) will be described with reference to FIGS. 6A and 6B.

  The resistance detection section 600 has a first contact portion 61 and a second contact portion 62. In other words, the detection unit 60 has a first contact portion 61 and a second contact portion 62.

  The first contact portion 61 contacts one of the first conductor C1 and the second conductor C2 with one contact. The first contact portion 61 is a portion formed of a metal material (for example, copper) (in the drawing, for convenience, the tip is denoted by reference numeral 61). Here, as shown in FIG. 6A, the first contact portion 61 is configured to be in contact with the first conductor C1, which is the connection member 3. However, the first contact portion 61 is always in contact with the first conductor C1, that is, fixed by soldering, welding, screwing, or the like, and is electrically connected. The first contact portion 61 is fixed to the inner block 44, for example.

  The second contact portion 62 contacts the other of the first conductor C1 and the second conductor C2 with one contact. The second contact portion 62 is a portion formed of a metal material (for example, copper) (in the drawing, the tip is denoted by reference numeral 62 for convenience). Here, as shown in FIG. 6A, the second contact portion 62 is configured to be in contact with the second conductor C2 that is the plug blade 911. However, needless to say, the second contact portion 62 is in a non-contact state with the blade 911 unless the plug 91 is connected to the outlet 1. The second contact portion 62 is configured to contact the side surface of the blade 911 when the blade 911 is inserted into the insertion hole 111 of the connection port 11. In the illustrated example, the tip of the second contact portion 62 is formed in a relatively sharp shape like a probe pin. However, considering the stable contact with the side surface of the blade 911, for example, It is desirable to be formed like a leaf spring. It is desirable that the blade 911 is inserted so as to push the leaf spring-like second contact portion 62 to the side at the time of insertion, and is directed toward the connection member 3. The second contact portion 62 is fixed to the outer cover 42, for example.

  The resistance detecting section 600 further includes a first measuring section 601. Both ends of the first measuring section 601 are electrically connected to the first contact section 61 and the second contact section 62, respectively. The first measuring unit 601 is a voltmeter that measures a voltage value of a voltage at a contact resistance at a contact point P1 (for convenience of description, reference numeral R10 is attached in FIG. 6B). In FIG. 6B, the “load resistance” of the load device LD1 including the wiring resistance is denoted by reference numeral R11 for convenience of explanation. The resistance value of the load resistor R11 is, for example, 10 [Ω] to 100 [Ω]. On the other hand, the resistance value of the contact resistance R10 is, for example, about 0.1 [mΩ] to 10 [mΩ] including both the normal connection state and the abnormal connection state.

  The resistance detecting section 600 further includes a second measuring section 602. The second measuring unit 602 measures a current value of a current flowing through the electric circuit L1. The second measuring unit 602 has a Rogowski coil type current sensor as described above. The current sensor is a Rogowski coil mounted on a board, and is mounted on the sensor board 86 so as to surround a through hole provided in the sensor board 86. A part of an electric path (a conductive member or the like) connecting the terminal member 2 to the connection member 3 is inserted into the through hole. Here, as an example, of the pair of terminal members 2, a part of an electric path connecting the terminal member 2 to which the power supply line 92 on the L pole side is connected to the corresponding connection member 3 is inserted, and the current on the L pole side is Is detected.

  The second measuring unit 602 includes, for example, a Rogowski coil type current sensor, but the type of the current sensor is not particularly limited. The second measurement unit 602 may include any of a CT (Current Transformer) type current sensor and a zero flux type (Hall element detection type, flux gate detection type, etc.) current sensor. Alternatively, the second measurement unit 602 may include a shunt resistor connected in series to an electric circuit between the terminal member 2 and the connection member 3 and detect a current value based on a voltage drop in the shunt resistor. .

  The resistance detection unit 600 also receives a processing circuit (not shown) that receives an electric signal corresponding to the voltage value measured by the first measurement unit 601 and an electric signal corresponding to the current value measured by the second measurement unit 602. ). The processing circuit calculates a resistance value R1 of the contact resistance R10 from the voltage value measured by the first measurement unit 601 and the current value measured by the second measurement unit 602, and sends the resistance value R1 to the control unit 7. Is transmitted. Note that all or a part of the functions of the processing circuit may be provided in the control unit 7. In other words, the control unit 7 may be included in a component of the resistance detection unit 600 and directly receive an electric signal corresponding to the current value and the voltage value from the first measurement unit 601 and the second measurement unit 602, respectively.

  In short, the resistance detection unit 600 of the present embodiment detects the resistance value R1 based on the voltage generated at the contact point P1 due to the current flowing through the load device LD1 that receives the power supply. Therefore, the resistance value R1 can be detected using the current flowing through the load device LD1, and the configuration can be simplified.

  By the way, as shown in FIG. 6A, the resistance detection unit 600 includes the first contact part 61 and the second contact part 62 described above in order to individually detect the contact resistance R10 for each of the left and right two blades 911. , And two first measuring units 601. Specifically, the connection member 3, which is the first conductor C1, includes an L pole (first pole) and an N pole (second pole) having different polarities. The two blades 911, which are the second conductors C2, have a first part C21 (right blade) that contacts the L pole (first pole) and a second part C21 that contacts the N pole (second pole). Site C22 (left blade). The contact point P1 includes a first contact point P11 between the L pole (first pole) and the first part C21, a second contact point P12 between the N pole (second pole) and the second part C22, ,including. Note that the number of the second measuring units 602 is one, and the current value measured by the second measuring unit 602 is shared.

  The processing circuit calculates the resistance values R1 of the left and right contact resistances R10 from the voltage value measured by each of the first measuring units 601 and the current value measured by the second measuring unit 602, respectively. An electric signal including the resistance value R1 is transmitted.

  Therefore, the detection unit 60 performs the interruption of the power supply and the notification regarding the resistance value R1 based on the resistance value R1 at each of the first contact point P11 and the second contact point P12. That is, the detection system 6 determines not only the connection state of one of the blades 911 but also the two blades 911 individually. If the resistance value R1 of any one of the left and right contact resistances R10 is equal to or more than the first resistance threshold value Rth1 and is a finite value, it notifies that the plug 91 is in an abnormal connection state. As a result, the reliability of the contact state between the conductors (C1, C2) can be further improved.

  By the way, the pair of blades 911 contacts the pair of second contact portions 62 prior to contacting the pair of connection members 3 as a contact sequence at the time of insertion into the outlet 1 (see FIG. 6A). . When the blade 911 comes into contact with the second contact portion 62, the first contact portion 61 on the right side, the first measuring portion 601 on the right side, the second contact portion 62 on the right side, the load device LD1, and the second contact portion 62 on the left side. Only the path from the left-side first measuring unit 601 to the left-side first contact point 61 may be temporarily formed. However, since the internal resistance of each first measurement unit 601 (voltmeter) is high to some extent, a situation may occur in which a large current flows through the path by applying a voltage such as 50 V or 100 V of the outlet 1. Sex is low. Note that such a possibility can be further reduced by appropriately providing a diode.

(2.4) Description of Plug Connection State and Operation Here, as one of the causes of the abnormal temperature rise in the outlet 1 or the plug 91, the plug blade 911 of the plug 91 and the connecting member 3 (the blade holder) of the outlet 1 ) (Between the first conductor C1 and the second conductor C2). That is, if the area where the blade 911 and the connecting member 3 come into contact with each other is small, the contact resistance between the blade and the connecting member 3 may increase due to an increase in contact resistance during energization (Joule heat). Heat phenomenon). Causes of the increase in the contact resistance include, for example, deformation of the connection member 3 caused by repeated insertion and removal of the plug 91, entry of foreign matter into the contact surface, and the like. FIG. 6C shows a state in which the connection member 3 is deformed due to repeated insertion and removal of the plug 91 for many years, and the area of the contact point P1 is smaller than the area of the contact point P1 in FIG. 6A. Is shown.

  On the other hand, according to the detection system 6 of the present embodiment, as shown in Table 1 below, for example, based on the resistance value R1, the plug 91 is in the non-connection state, the normal connection state, and the abnormal connection state ( (Contact failure) can be determined. Since Table 1 below focuses only on the determination result regarding the connection state of the plug 91, the determination result including the detected temperature T1 is omitted. The numerical values in Table 1 are merely examples, and are not particularly limited.

  The current values in Table 1 are the current values of the current flowing through the load device LD1 measured by the second measuring unit 602. The voltage values in Table 1 are the voltage values of the voltage of the contact resistance R10 measured by the first measuring unit 601.

  When the resistance value R1 is ∞ [Ω], the detection unit 60 of the detection system 6 determines that “the plug is not connected” because it corresponds to the second resistance threshold value Rth2 (infinity). The detection unit 60 sets, for example, a connection indicator lamp provided on the front side of the housing 4 to notify a user of a connection state to a light-off state. However, even if it is determined that the connection state is “unconnected state”, the detection unit 60 further performs notification of the interruption and abnormal state of the electric circuit L1 or notification of a warning state depending on the detected temperature T1.

  When the resistance value R1 is, for example, 0.1 [mΩ], the detection unit 60 determines that “plug connection (normal)” because the resistance value R1 is less than the first resistance threshold value Rth1 (for example, 1 [mΩ]). The detecting unit 60 turns on the connection indicator light in green, for example. Similarly, depending on the detected temperature T1, the detection unit 60 further performs notification of the interruption of the electric circuit L1 and an abnormal state, or notification of a warning state.

  When the resistance value R1 is, for example, 10 [mΩ], the detection unit 60 determines that the plug connection is abnormal (abnormal) because it is equal to or more than the first resistance threshold value Rth1 and is a finite value. The detection unit 60 turns on the connection indicator light in red, for example. Similarly, depending on the detected temperature T1, the detection unit 60 further performs notification of the interruption of the electric circuit L1 and an abnormal state, or notification of a warning state.

  As described above, in the present embodiment, the detection system 6 determines the state of the contact point P1 between the first conductor C1 and the second conductor C2 based on the resistance value R1 related to the contact point P1, and connects the plug 91. Notify the status. Therefore, the user who has received the notification of the connection state from the outlet 1 can know that there is a high possibility that the plug 91 has poor contact. The detection system 6 also cuts off the electric circuit L1 depending on the detected temperature T1. Therefore, the reliability regarding the contact state between the conductors (C1, C2) can be further improved.

  By the way, when the outlet 1 is, for example, an outdoor outlet or an EV charging outlet, the surface having the connection port 11 to which the plug 91 is connected faces the ground (vertically downward). there is a possibility. In this case, the outlet 1 has a lock mechanism for locking the plug blade 911 by turning the connected plug 91. However, when the user forgets to perform the lock, the plug 91 may drop from the outlet 1 due to its own weight during use of the outlet 1, or may be in a state just before the drop. In short, with respect to poor contact of the plug 91 due to its own weight, it is expected that the outdoor outlet and the EV charging outlet and the like are higher than the indoor outlet. However, since the outlet 1 includes the detection system 6 described above, it is possible to more effectively improve the reliability of the contact state with respect to such a contact failure due to its own weight.

(3) Modifications The above embodiments are merely one of various embodiments of the present disclosure. The above embodiment can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved. The functions similar to those of the control unit 7 and the processing circuit of the resistance detection unit 600 according to the above-described embodiment are embodied by a control method of the detection system 6, a computer program, or a non-temporary recording medium storing the computer program. May be done.

  Hereinafter, modified examples of the above embodiment will be listed. The modifications described below can be applied in appropriate combinations. In the following, the above embodiment may be referred to as a “basic example”.

  The detection system 6 in the present disclosure includes a computer system. The computer system mainly has a processor and a memory as hardware. When the processor executes a program recorded in the memory of the computer system, the function as the detection system 6 in the present disclosure is realized. The program may be pre-recorded in the memory of the computer system, may be provided through an electric communication line, or may be recorded in a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive readable by the computer system. May be provided. A processor of a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). An integrated circuit such as an IC or an LSI referred to here differs depending on the degree of integration, and includes an integrated circuit called a system LSI, a VLSI (Very Large Scale Integration), or a ULSI (Ultra Large Scale Integration). Furthermore, an FPGA (Field-Programmable Gate Array), which is programmed after the manufacture of the LSI, or a logic device capable of reconfiguring the connection relation inside the LSI or reconfiguring the circuit section inside the LSI, is also adopted as a processor. Can be. The plurality of electronic circuits may be integrated on one chip, or may be provided separately on a plurality of chips. The plurality of chips may be integrated in one device, or may be provided separately in a plurality of devices. The computer system includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

  It is not an essential configuration of the detection system 6 that the plurality of functions in the detection system 6 are integrated in one housing, and the components of the detection system 6 are provided separately in the plurality of housings. May be. Further, at least a part of the function of the detection system 6, for example, a part of the function of the control unit 7 may be realized by a cloud (cloud computing) or the like.

  Conversely, the functions of the detection system 6 may be integrated in one housing 4 of the outlet 1 as in the first embodiment.

(3.1) Modification 1
Hereinafter, this modification (Modification 1) will be described with reference to FIGS. 8A and 8B. Note that constituent elements common to the basic example are denoted by the same reference numerals as in the basic example, and description thereof may be omitted as appropriate.

  The resistance detection unit 600 of the basic example detects the resistance value R1 based on the voltage generated at the contact point P1 due to the current flowing through the load device LD1 that receives power supply (see FIG. 6A). However, in the configuration of the basic example, even if the plug 91 is actually connected to the outlet 1, if the power of the load device LD1 is in the off state (or the standby state), the current value measured by the second measuring unit 602 Can be zero (or a value close to zero). For example, when the load device LD1 is a lighting device and is off, the current value measured by the second measuring unit 602 is zero.

  Therefore, in the basic example, as shown in Table 2 below, it may be difficult to determine whether the plug 91 is not connected to the outlet 1 or not, and whether the plug 91 is connected and the load device LD1 is off. is there.

  Accordingly, the resistance detection unit 600A in the detection system 6 of the first modification includes a power supply unit 63 that applies a voltage between the first conductor C1 and the second conductor C2, as shown in FIG. 8A. The resistance detection unit 600A includes a third measurement unit 603 (ammeter) and a resistor R12 instead of the first measurement unit 601 and the second measurement unit 602. A series circuit including the power supply unit 63, the resistor R12, and the third measuring unit 603 is electrically connected between both ends of the contact resistor R10. The power supply unit 63 is, for example, a primary battery, and the applied voltage of the power supply unit 63 is, for example, 1 [V], but is not particularly limited. The resistor R12 is provided to suppress a current having a magnitude of 10 [A] or the like flowing through the electric circuit L1 from flowing into the series circuit.

  The third measuring unit 603 measures the current value of the current flowing through the series circuit, and outputs an electric signal corresponding to the current value to a processing circuit (not shown). The processing circuit calculates a combined resistance value of the contact resistance R10 and the load resistance R11 from the applied voltage and the current value measured by the third measurement unit 603. If the resistance value of the load resistance R11 is known, the control unit 7 obtains the resistance value of the contact resistance R10 by subtracting the resistance value of the load resistance R11 from the combined resistance value as the resistance value R1 relating to the contact point P1. It may be used to determine the state. Alternatively, the control unit 7 may use the combined resistance value as it is for determining the connection state.

  In short, the detection unit 60 of the first modification detects the resistance value R1 based on the current flowing to the contact point P1 by the applied voltage.

  According to this configuration, as shown in Table 3 below, "the plug is not connected" where the first conductor C1 and the second conductor C2 are not in contact, and the first conductor C1 and the second conductor C2 are in contact with each other. On the other hand, "plug connection (load off)" in which the power of the load device LD1 is off can be distinguished. The numerical values in Table 3 are merely examples, and are not particularly limited.

  By the way, as another example of the first modification, the detection unit 60 may include both the resistance detection unit 600 of the basic example and the resistance detection unit 600A of the first modification. For example, the detection unit 60 may operate the resistance detection unit 600A that applies a voltage only when it is determined that the plug is not connected, and distinguish between “plug not connected” and “plug connection (load off)”. Good. In this case, the power consumption of the power supply unit 63 can be suppressed.

(3.2) Modification 2
Hereinafter, this modification (Modification 2) will be described with reference to FIGS. 9A and 9B. Note that constituent elements common to the basic example are denoted by the same reference numerals as in the basic example, and description thereof may be omitted as appropriate.

  In the basic example, as shown in FIG. 6A, the second contact portion 62 is configured to contact the second conductor C2, which is the blade 911, with one contact. In other words, the second contact portion 62 in the form of the tip of a probe pin or a leaf spring contacts the blade 911 at one location from one side.

  As shown in FIG. 9A, the second contact portion 62 in the resistance detection unit 600 </ b> B of Modification 2 has, for example, a shape similar to the connection member 3 (blade receiver). In short, the tip of the second contact portion 62 is bifurcated into a hoe shape, and the blade 911 is sandwiched by elastic deformation from both left and right sides, that is, the second contact portion 62 is in contact with the two contacts PT1 and PT2. It is configured.

  According to this configuration, the second conductor C2, which is the plug blade 911, comes into contact with the two contacts PT1 and PT2, thereby providing more stable contact between the second contact portion 62 and the second conductor C2. Can be. In addition to the structural stability, it is possible to suppress an increase in contact resistance between the second contact portion 62 and the second conductor C2.

  FIG. 9B shows another example of the second modification (the resistance detection unit 600C). The resistance detecting section 600C has a second contact portion 62 formed by connecting two or more (three in FIG. 9B) portions of which the tip in FIG. 9A is forked into a forked shape. The second contact portion 62 sandwiches the blade 911 from the left and right sides by elastic deformation at the connected portion. With this configuration, it is possible to further provide stable contact between the second contact portion 62 and the second conductor C2.

(3.3) Modification 3
Hereinafter, this modification (Modification 3) will be described. Note that constituent elements common to the basic example are denoted by the same reference numerals as in the basic example, and description thereof may be omitted as appropriate.

  In the basic example, the detection unit 60 determines the state of the contact point (P1) based on the detected temperature T1 in addition to the resistance value R1.

  The detection unit 60 of the third modification determines the state of the contact point P1 based on the information regarding the passage of time in addition to the resistance value R1. The above-mentioned time is a time when the first conductor C1 and the second conductor C2 are in a contact state. That is, it is the time when the plug 91 is in the connected state.

  The detecting unit 60 further has a timer (a timer built in the control unit 7) for measuring the accumulated time. When the detecting unit 60 determines that the plug 91 has changed from the unconnected state to the connected state based on the resistance value R1, the detecting unit 60 starts time measurement using a timer. When the time of the timer elapses a predetermined time (for example, one year or the like), the detection unit 60 notifies the user to that effect. The detection unit 60 may notify the user by blinking the connection indicator, for example, or may output audio data. The timing of the timer may be reset by determining that the plug 91 has changed to the unconnected state based on the resistance value R1, or an operation indicating from the user that the connected state has been confirmed (a push operation to the push button). ) May be reset.

  When the load device LD1 is a refrigerator, a washing machine, or the like, the state in which the plug 91 is connected to the outlet 1 after the user purchases the load device LD1 is likely to continue on a yearly basis. Therefore, foreign matter such as dust can accumulate on the plug 91 and the outlet 1. Therefore, for example, if the detection unit 60 outputs a voice message such as “Please perform cleaning”, the possibility of preventing contact failure, tracking, and the like due to entry of a foreign object is increased. Therefore, the reliability of the contact state can be further improved.

  By the way, in the third modification, it is necessary to determine whether the plug 91 is not connected to the outlet 1 and whether the plug 91 is connected and the load device LD1 is in the off state. Preferably, a 600A configuration is applied.

(3.4) Modification 4
Hereinafter, this modification (Modification 4) will be described with reference to FIGS. 10A and 10B. Note that constituent elements common to the basic example are denoted by the same reference numerals as in the basic example, and description thereof may be omitted as appropriate.

  The outlet 1 of the basic example accommodates all the functions of the detection system 6 in its housing 4. However, at least a part of the function of the detection system 6 may be added later (mechanically) at the installation site according to the installation environment of the outlet 1 or a request of a user or the like.

  The outlet 1 of the fourth modification includes an adapter U1 (see FIG. 10A) separate from the housing 4. The adapter U <b> 1 corresponds to “at least a part of the detection system 6” having an attachment portion 64 detachably attached to the housing 4. Here, it is assumed that the function of the resistance detection unit 600 described in the basic example in the detection system 6 is provided in the adapter U1. Although there is a possibility that the size of the adapter U1 may be increased, the entire detection system 6 may be provided in the adapter U1.

  The adapter U1 has an outer shell formed in a cylindrical shape as a whole. The adapter U1 has, at the front thereof, an insertion port U10 into which a pair of blades 911 of the plug 91 of the load device LD1 can be inserted. The adapter U1 has a pair of blades U11 (only one in the illustrated example) and a ground pin U12 on the back surface.

  In short, the adapter U1 can be connected to the housing 4 of the outlet 1. The plug 91 of the load device LD1 can be connected to the adapter U1. By connecting the plug 91 of the load device LD1 to the adapter U1 attached to the housing 4, the load device LD1 can receive power supply. The pair of blades U11 and the ground pin U12 correspond to the mounting portion 64. The ground pin U12 may be omitted.

  In the fourth modification, the first contact portion 61 is fixed in contact with the blade receiver in the adapter U1, and the second contact portion 62 contacts the plug blade 911 inserted from the insertion port U10. , Adapter U1. Further, a first measuring unit 601, a second measuring unit 602, a processing circuit, and the like are also provided in the adapter U1.

  The adapter U1 may have a wireless communication function that enables short-range communication. That is, the adapter U1 may have a communication interface capable of communicating with the housing 4 of the outlet 1 wirelessly. On the other hand, a communication interface capable of communicating with the adapter U1 may also be provided on the housing 4 side. Alternatively, the adapter U1 and the housing 4 may have connectors that can be electrically connected to each other. That is, the attachment portion 64 may include a connector connected to a connector in the housing 4 in addition to the pair of the blade U11 and the ground pin U12. The resistance detection unit 600 in the adapter U1 outputs an electric signal including the resistance value R1 to the control unit 7 of the housing 4 by wireless communication or through a signal path by connector connection.

  According to this configuration, the function of the detection system 6 can be added later according to the installation environment of the outlet 1 or a request of a user or the like.

  As another example of Modification 4, outlet 1 may include an adapter U2 (see FIG. 10B) separate from housing 4. The adapter U2 has an outer shell formed in a flat plate shape. Unlike the adapter U1, the adapter U2 has a blade connected to the connecting member 3 (blade receiver) in the housing 4 and a blade receiver connected to the blade 911 of the plug 91 of the load device LD1. Absent. The adapter U2 has a through hole U20 through which the pair of blades 911 pass, and a second contact portion 62 (not shown in FIG. 10B) that contacts the blades 911. The second contact portion 62 is provided, for example, on the back side of the housing of the adapter U2. The adapter U2 has a connector (corresponding to the mounting portion 64) connected to a connector in the housing 4 on the back side.

  The plug blade 911 of the plug 91 passes through the through-hole U20, and further passes through the insertion hole 111 of the connection port 11 of the housing 4, and is connected to the connection member 3. In this state, the second contact portion 62 of the adapter U2 forms the circuit configuration shown in FIG. 6B in the basic example together with the first contact portion 61 and the first measuring portion 601 on the housing 4 side by the above-described connector connection. . In short, in the resistance detection unit 600 of the basic example, only the second contact portion 62 is provided on the adapter U2.

  Also in this configuration, the function of the detection system 6 can be added later according to the installation environment of the outlet 1 or a request of a user or the like.

  In both cases of the adapter U1 and the adapter U2, it is preferable that a lock function be provided in consideration of the stability of the contact state with the connection member 3 in the housing 4. In particular, in the adapter U2, it is desirable to reduce the thickness in the front-rear direction as much as possible in consideration of the stability of the connection state between the blade 911 and the connection member 3.

(3.5) Other Modifications In the basic example, the resistance value R1 is an electrical contact resistance value between the blade 911 and the connection member 3 (blade receiver). However, the resistance value R1 between the blade 911 and the connection member 3 may be a physical resistance value (stress value). However, as for the resistance value R1, it is not necessary to provide a component for obtaining the stress value, for example, as compared with the case where the electrical contact resistance value is a physical stress value. Can be planned.

  In the basic example, the connection state is simply determined individually for the L pole and the N pole (the ground pole may be included). However, the detection system 6 may perform a comprehensive diagnosis based on the respective connection states of the L pole, the N pole, and the ground pole. For example, when the detection system 6 determines that there is an abnormality in the connection state of all three poles, the detection system 6 may notify a diagnosis result indicating that the plug 91 is coming out of the outlet 1 and falling. For example, when it is determined that only one of the three poles has an abnormality in the connection state, the detection system 6 may also notify a diagnosis result indicating that there is a high possibility that a foreign object has entered. If the detection system 6 determines that only the ground electrode of the three poles has an abnormality in the connection state, the detection system 6 does not need to perform the notification according to the type of the load device LD1. However, for example, in the load device LD1 such as a refrigerator or a washing machine, it is desirable to notify even if only the ground electrode is not connected, but in other home electric appliances (such as a dryer), only the ground electrode is not connected. In this case, the notification may be omitted. The control unit 7 may determine the type of the load device LD1 based on a current value flowing through the electric circuit L1.

  In the basic example, the “notification” regarding the connection state is performed by the control unit 7 performing “determination processing” as to whether the connection state is the connection state or the non-connection state, and based on the determination result, the sound is output and the connection indicator light is turned on. To inform the user. However, such determination processing may be omitted, and “notification” in the present disclosure may include simply displaying the resistance value R1 calculated by the resistance detection unit 600.

  In the basic example, the detection system 6 determines the connection state of the plug 91 and the connection member 3 based on the resistance value R1 of the contact resistance R10. However, in addition to or instead of the determination function, the detection system 6 determines the connection state of the core 921 of the power supply line 92 and the terminal member 2 based on the resistance value of the contact resistance. May be. In other words, the first contact part 61 may be fixed so as to be in contact with the terminal member 2, and the second contact part 62 may be arranged so as to be in contact with the inserted core wire 921.

  In the basic example, the entirety of the detection system 6 is provided in the housing 4, and in the modification 4, a part of the detection system 6 is provided in the adapters U <b> 1 and U <b> 2 attached later, but is not limited thereto. A part of the detection system 6 (particularly, the control unit 7) may be provided in an external device. The external device may be, for example, a so-called HEMS (Home Energy Management System) controller or a BEMS (Building Energy Management System) controller. Further, the external device may be a measuring unit installed in or around the distribution board. The external device may be a stationary type unit or a portable unit. Such an external device may manage identification information and the like of the plurality of outlets 1 installed in the building. The external device acquires information on the resistance value R1 and the temperature from each outlet 1 and intensively monitors the connection state with the load device LD1 and occurrence of an abnormal temperature rise, and shuts off the corresponding outlet 1. Alternatively, a wireless or wired instruction may be given to make the notification. In particular, the second measuring unit 602 may be installed in a distribution board.

  Further alternatively, at least a part of the detection system 6 may be arranged on the second side receiving the power instead of the first side (the side of the wiring device such as the outlet 1) supplying the power. For example, inside the plug 91 of the load device LD1, the second contact portion 62 may be fixed so as to be in contact with the blade 911.

  The adapter U1 and the adapter U2 of Modification 4 may transmit the information of the resistance value R1 and the temperature by wire or wirelessly to the above-described external device or an information terminal such as a smartphone owned by the user. In this case, dedicated application software that enables communication with the adapter U1 and the adapter U2 is installed in the information terminal. If the adapter U1 has a function of a PLC adapter that realizes Power Line Telecommunication (PLC), information on the resistance value R1 and the temperature is transmitted to a measurement unit or the like in the distribution board by the PLC. May be.

  In the basic example, the warning state is determined in consideration of the frequency and the period. However, the normal state and the abnormal state may be determined in consideration of the frequency and the period.

  In the basic example, the warning state is classified into a caution state or a dangerous state, but this classification is not essential. In short, the status information may not be four stages of normal, abnormal, caution, and danger, but may be three stages of normal, abnormal, and warning, or may be five or more stages.

  In the basic example, the control unit 7 having a microcontroller as a main component acquires the resistance value R1 calculated based on the voltage value or the like measured by the resistance detection unit 600 as digital data and performs the determination process. However, the detection system 6 is configured by an analog circuit, and the determination processing and the like may be omitted. For example, the detection system 6 may have a structure in which, when the output of the detection system 6 exceeds the threshold value through the differentiating circuit, the indicator light indicating the connection state simply lights up.

  The outlet 1 of the basic example is not limited to the one with a ground electrode, and may be one without a ground electrode. For example, it may be an outlet for 200 V AC or DC. Further, the outlet 1 is not limited to the A type outlet, and may be an outlet to which a plug having a pin-shaped plug blade can be connected, such as a B type or a C type. The outlet 1 is not limited to the two-port type, and may be, for example, a one-port type or a three-port type. Further, the outlet 1 may further include, for example, a motion sensor, a timer, a switch, or the like. Further, the terminal member 2 may not be a quick-connecting terminal, and may be, for example, a screw-type terminal. In addition, the outlet 1 is not limited to a configuration in which the rear portion is embedded in the construction surface 100 using the mounting frame (embedded installation type), and is installed on the construction surface 100 in a state where the whole is exposed. It may be of a configuration (exposed installation type).

  The outlet 1 may have a lock mechanism for preventing the plug 91 from coming off. The lock mechanism prevents the plug blade 911 of the plug 91 from falling out, for example, by rotating the plug 91. The outlet 1 may be provided with a door.

  In the above-described embodiment, when the electromagnetic release device operates and the opening / closing section M4 switches from the conductive state to the cutoff state, the operating member 81 also moves to the off position in conjunction with the opening / closing section M4, but is not limited to this configuration. . For example, when the opening / closing section M4 switches from the conductive state to the cutoff state, the operating member 81 may remain at the ON position. In this case, the recovery operation is realized by temporarily moving the operation member 81 from the ON position to the OFF position and then moving the operation member 81 from the OFF position to the ON position.

  Further, the opening / closing section M4 may be realized by, for example, a mechanical relay or a semiconductor switch.

  In the present disclosure, in comparing the detected temperature T1 with the first temperature threshold value Tth1 or the second temperature threshold value Tth2, when the two values are equal, and when one of the two values exceeds the other, both are compared. Including "over" may be synonymous with "greater (exceeded)." Similarly, regarding the binary comparison between the resistance value R1 and the first resistance threshold Rth1 or the second resistance threshold Rth2, and the binary comparison between the occurrence frequency and the specified frequency, “over” is “large ( Is exceeded) ". That is, whether or not the case where the two values are equal to each other can be arbitrarily changed depending on the setting of the threshold value or the like. Therefore, there is no technical difference between “above” and “greater (exceeded)”. Similarly, “less than (small)” may be synonymous with “below”.

(4) Advantages As described above, the detection system (6) according to the first embodiment is at least partially disposed on the first side for supplying power or the second side for receiving power supply. You. The first conductor (C1) on the first side and the second conductor (C2) on the second side are in contact with each other to form an electric power path (L1). The detection system (6) includes a detection unit (60). The detection unit (60) controls supply interruption and resistance (R1) based on a resistance (R1) relating to a contact point (P1) between the first conductor (C1) and the second conductor (C2). Perform at least one of the notifications. According to the first aspect, since the detection unit (60) performs at least one of cutoff and notification based on the resistance value (R1) related to the contact point (P1), the contact state between the conductors (C1, C2). Reliability can be improved.

  Regarding the detection system (6) according to the second aspect, in the first aspect, it is preferable that the detection unit (60) has a first contact point (61) and a second contact point (62). The first contact portion (61) preferably contacts one of the first conductor (C1) and the second conductor (C2) with one contact. The second contact portion (62) preferably contacts the other of the first conductor (C1) and the second conductor (C2) with at least two or more contacts. The resistance value (R1) is a resistance value between the first contact portion (61) and the second contact portion (62) in the electric circuit (L1). According to the second aspect, since the second contact portion (62) contacts the conductor (C1 or C2) with at least two contacts, the detection portion (60) and the conductor (C1 or C2) More stable contact can be provided.

  Regarding the detection system (6) according to the third aspect, in the first or second aspect, the resistance value (R1) is preferably an electrical contact resistance value. According to the third aspect, compared to the case where the resistance value (R1) is a physical resistance value (stress value), for example, there is no need to provide a component for obtaining the stress value, and the configuration is simplified. Can be achieved.

  Regarding the detection system (6) according to the fourth aspect, in the third aspect, the detection unit (60) is based on a voltage generated at the contact point (P1) by a current flowing through the load device (LD1) that receives power. Therefore, it is preferable to detect the resistance value (R1). According to the fourth aspect, since the resistance value (R1) can be detected using the current flowing through the load device (LD1), the configuration can be simplified.

  The detection system (6) according to a fifth aspect, in the third aspect, may further include a power supply unit (63) for applying a voltage between the first conductor (C1) and the second conductor (C2). preferable. It is preferable that the detection unit (60) detects the resistance value (R1) based on the current flowing to the contact point (P1) by the voltage. According to the fifth aspect, for example, the state where the first conductor (C1) and the second conductor (C2) are not in contact with each other and the first conductor (C1) and the second conductor (C2) are in contact with each other On the other hand, it is possible to distinguish between the state where the power of the load device (LD1) is off.

  Regarding the detection system (6) according to the sixth aspect, in any one of the first aspect to the fifth aspect, the detection unit (60) may include information on the passage of time in addition to the resistance value (R1). It is preferable to determine the state of the contact point (P1) based on this. The above-mentioned time is a time in which the first conductor (C1) and the second conductor (C2) are in a contact state. According to the sixth aspect, the reliability of the contact state between the conductors (C1, C2) is further improved as compared with the case where the state of the contact point (P1) is determined based only on the resistance value (R1). Can be.

  Regarding the detection system (6) according to the seventh aspect, in any one of the first aspect to the sixth aspect, the detection unit (60) includes, in addition to the resistance value (R1), the detection unit (60) of the electric circuit (L1). It is preferable to determine the state of the contact point (P1) based on information on the temperature (detected temperature T1). According to the seventh aspect, the reliability of the contact state between the conductors (C1, C2) is further improved as compared with the case where the state of the contact point (P1) is determined based only on the resistance value (R1). Can be.

  Regarding the detection system (6) according to the eighth aspect, in the seventh aspect, it is preferable that the detection unit (60) performs shut-off when at least the first condition or the second condition is satisfied. The first condition is that the resistance value (R1) is less than the resistance threshold value (first resistance threshold value Rth1) and the temperature (detection temperature T1) is equal to or higher than the first temperature threshold value (Tth1). The second condition is that the resistance value (R1) is equal to or higher than a resistance threshold (first resistance threshold Rth1) and the temperature is equal to or higher than a second temperature threshold (Tth2). The second temperature threshold (Tth2) is preferably lower than the first temperature threshold (Tth1). According to the eighth aspect, the threshold value of the temperature to be cut off changes depending on whether the resistance value (R1) is equal to or larger than the resistance threshold value, so that the reliability of the contact state between the conductors (C1, C2) can be further improved. it can.

  The detection system (6) according to the ninth aspect is preferably arranged on the first side in any one of the first to eighth aspects. According to the ninth aspect, the configuration on the second side can be simplified as compared with the case where the detection system (6) is arranged on the second side receiving power supply.

  The outlet (1) according to the tenth aspect includes a detection system (6) according to any one of the first aspect to the ninth aspect, a first conductor (C1) contacted by a second conductor (C2), A housing (4) that houses at least the first conductor (C1). According to the tenth aspect, it is possible to provide the outlet (1) including the detection system (6) capable of improving the reliability regarding the contact state between the conductors (C1, C2).

  Regarding the outlet (1) according to the eleventh aspect, in the tenth aspect, the first conductor (C1) preferably includes a first pole and a second pole having different polarities. The second conductor (C2) preferably includes a first portion (C21) that contacts the first pole and a second portion (C22) that contacts the second pole. The contact point (P1) is a first contact point (P11) between the first pole and the first part (C21), and a second contact point (P12) between the second pole and the second part (C22). ) Is preferable. The detecting unit (60) sends at least one of the interruption of the supply and the notification regarding the resistance value (R1) based on the resistance value (R1) at each of the first contact point (P11) and the second contact point (P12). It is preferred to do so. According to the eleventh aspect, it is possible to improve the reliability of the contact state of each of the first and second poles having different polarities in the outlet (1).

  Regarding the outlet (1) according to the twelfth aspect, in the tenth or eleventh aspect, at least a part of the detection system (6) includes an attachment portion (64) that can be attached later to the housing (4). It is preferable to have According to the twelfth aspect, the function of the detection system (6) can be added later according to the installation environment of the outlet (1) or the demand of the user or the like.

  The configurations according to the second to ninth aspects are not essential configurations for the detection system (6), and can be omitted as appropriate. The configurations according to the eleventh and twelfth aspects are not indispensable to the outlet (1) and can be omitted as appropriate.

DESCRIPTION OF SYMBOLS 1 Outlet 4 Housing 6 Detection system 60 Detection part 61 First contact part 62 Second contact part 63 Power supply part 64 Mounting part C1 First conductor C2 Second conductor C21 First part C22 Second part L1 Electric circuit P1 Contact point P11 1 contact point P12 2nd contact point LD1 Load device R1 Resistance value Rth1 First resistance threshold (resistance threshold)
T1 Detection temperature (temperature)
Tth1 First temperature threshold Tth2 Second temperature threshold

Claims (12)

A detection system disposed, at least in part, on a first side for supplying power or on a second side for receiving the power, wherein a first conductor on the first side; And the second conductor on the side contact each other to form an electric path for the power,
Based on a resistance value of a contact point between the first conductor and the second conductor, based on a resistance value, comprising a detection unit that performs at least one of cutoff of the supply and notification of the resistance value,
Detection system. The detection unit,
A first contact portion that contacts one of the first conductor and the second conductor at one contact;
A second contact portion that contacts the other of the first conductor and the second conductor with at least two or more contacts,
The resistance value is a resistance value between the first contact portion and the second contact portion in the electric circuit,
The detection system according to claim 1. The resistance value is an electrical contact resistance value,
The detection system according to claim 1. The detection unit detects the resistance value based on a voltage generated at the contact point due to a current flowing through a load device that receives the supply of the power,
The detection system according to claim 3. A power supply unit for applying a voltage between the first conductor and the second conductor,
The detection unit detects the resistance value based on a current flowing through the contact point by the voltage,
The detection system according to claim 3. The detection unit, in addition to the resistance value, determines the state of the contact point based on information about the time elapsed when the first conductor and the second conductor are in a contact state,
The detection system according to claim 1. The detection unit, in addition to the resistance value, based on information about the temperature of the electric circuit, determines the state of the contact point,
The detection system according to claim 1. The detection unit performs the cutoff when at least the first condition or the second condition is satisfied,
The first condition is that the resistance value is less than a resistance threshold value and the temperature is equal to or more than a first temperature threshold value.
The second condition is that the resistance value is equal to or greater than the resistance threshold, and the temperature is equal to or greater than a second temperature threshold,
The second temperature threshold is lower than the first temperature threshold,
The detection system according to claim 7. The detection system is located on the first side;
The detection system according to claim 1. A detection system according to any one of claims 1 to 9,
The first conductor with which the second conductor contacts,
A housing accommodating at least the first conductor;
Comprising,
Outlet. The first conductor includes a first pole and a second pole having different polarities,
The second conductor includes a first portion that contacts the first pole and a second portion that contacts the second pole,
The contact point is
A first contact point between the first pole and the first portion;
A second contact point between the second pole and the second portion;
Including
The detection unit performs at least one of the interruption of the supply and the notification regarding the resistance value based on the resistance values at each of the first contact point and the second contact point,
The outlet according to claim 10. At least a part of the detection system has a mounting portion that can be retrofitted to the housing.
The outlet according to claim 10 or 11.

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