JP2816111B2 - Wiring plug connector plug receiver that can monitor tracking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug receiver for a wiring plug-in connector capable of monitoring tracking, and has an object of tracking when tracking occurs in the plug receiver itself or the plug, or in a bathroom, outdoors, or the like. Even if the plug receptacle of the wiring plug-in connector is installed in a place where water droplets easily adhere, the further progress of tracking can be stopped, preventing the occurrence of fire and easily measuring the progress of tracking. The object of the present invention is to provide a plug receptacle of a wiring plug-in connector capable of monitoring tracking.

[0002]

BACKGROUND OF THE INVENTION In recent years, the installation of electrical equipment has increased due to the introduction of OA equipment in houses, stores, offices, factories, and the like, and the number of fires caused by electrical equipment has also increased accordingly. Among these electric fires, fires due to the tracking phenomenon between the two plug blades in particular tend to increase year by year.

[0003] The tracking phenomenon is a form of deterioration of an insulator. When a conductive solution or moisture containing dust is present on the insulator between the insertion blades of the insertion plug, a current flows between both electrodes and Joule heat is generated. This is a deterioration phenomenon that occurs, scintillation occurs upon drying on an insulator, and follows a process in which a conductive path is formed by carbonization. Note that scintillation refers to local discharge. In order to prevent such tracking between the plugs, do not leave them plugged in at all times, and unplug them from outlets when not in use, or periodically check plugs that have been used for a long time. And preventive measures such as cleaning the gaps with a dry cloth or the like.

[0004]

2. Description of the Related Art For example, a plug receiver (embedded outlet) A of an insertion plug as shown in FIG. 6 is used outdoors as an electrical wiring connection device for ordinary households, sign lights and vending machines, or It is used everywhere in the activity space such as stores and companies. This embedded outlet A is usually
As shown in the figure, a body c provided with a blade insertion hole b connected to an electric wiring (not shown) is embedded in a predetermined wall surface.

[0005]

However, in general households, the above-mentioned embedded outlet A is often arranged in a place where moisture is easily generated, such as a bathroom or a toilet, and dew condensation tends to occur. It is also located outdoors. Therefore, in the embedded outlet A disposed in such a place, the connection surface between the insertion plug (not shown) and the blade insertion hole b of the embedded outlet A is formed by long-term connection use. Some have dust, moisture, salt, etc. attached to them. Dust, moisture, salt, etc., attached in this manner become conductors, and are used between the two blades of the insertion plug (not shown).
A current may flow along the joint surface portion of. Since most of this current flows between electric wires or cords, even if there is a leakage breaker on the power supply side, it is not interrupted, and scintillation occurs, causing a tracking phenomenon and eventually causing a fire. As a countermeasure for this, there is one that improves the material of the joining surface of the insertion plug or one that improves the anti-tracking property by increasing the creepage distance by providing small irregularities on the joining surface of the insertion plug, for example. There is a problem that it does not completely prevent the occurrence of scintillation and tracking, and does not provide a fire prevention measure by tracking the embedded outlet. It is also conceivable to perform cleaning by periodically pulling out the insertion plug, etc., but there are also cases where the embedded outlet A is provided in a place where cleaning is difficult, such as underneath the back of the closet, In addition, there were cases in which a power outage could not be made immediately, such as when connecting to a computer, and this was not an efficient method. Furthermore, since such an embedded outlet A is a part of indoor electrical wiring, insulation resistance measurement and the like are periodically performed according to the Electricity Business Law. However, in a state including the insertion plug, the tracking portion is not grounded, so it is discovered. There was also a problem that could not be done. In other words, one of the reasons is that, in the electrical equipment technical standard, the insulation resistance is measured not only between the ground and the electric circuit but also between the electric wires that can measure tracking etc. In order to measure `` between wires '' in a situation where all electrical equipment must be removed from the wiring, it is impossible to actually measure in a large building anyway in an ordinary household, Was not detected even if it occurred.

On the other hand, there is an embedded outlet provided with a ground terminal, but this is simply a ground terminal for relaying the ground wire on the plug side, and is not connected to the plug itself. The purpose is not to ground the joint surface or the like, and since the joint surface with the insertion plug is an insulator, when tracking occurs in the insertion plug, the tracking portion is not grounded. Therefore, even if the earth leakage breaker is provided, it does not operate. In addition, even if it has a built-in ground electrode, even if tracking occurs because it does not penetrate between the blade insertion holes, it is difficult to be grounded as described above,
The above-mentioned problem is not solved. Therefore, the present invention is applicable to a plug receptacle for a wiring plug-in connector installed in a place where moisture is likely to be generated, such as a bathroom or outdoors, but the progress of tracking phenomenon in the plug receptacle itself of the wiring plug-in connector. It is an object of the present invention to provide a plug receptacle for a wiring plug-in connector capable of preventing a fire due to the above and preventing the fire and easily measuring the progress of tracking.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and in the plug receiver of the plug-in connector for wiring according to the first aspect, the blade insertion hole of the plug is formed. Wiring connector comprising a main body, a wiring portion extending from the main body and connected to a predetermined power supply, and a joining surface with a plug inserted on the surface of the main body. Wherein the conductive surface is formed on a part or the entire surface of the joint surface to form a ground electrode and to be connected to a ground terminal or a ground wire. In the plug receiver of the plug-in connector for wiring according to claim 2, an earth leakage breaker is provided between the main body and the power supply. In the plug receiver of the wiring plug-in connector according to claim 3, the joining surface is formed of a material having conductivity, and a conductive portion is provided in a gap between the blade insertion holes of the main body. Has one end electrically connected to the joint surface, and the other end provided with a ground terminal or a ground wire. In the plug receiver of the wiring plug-in connector according to the fourth aspect, a part of a gap portion of the blade insertion hole in the joint surface protrudes from the surface of the joint surface.

[0008]

According to the plug receiving device of the first aspect of the present invention, the insulation between the plug and the plug receiving device of the wiring plug due to the tracking phenomenon is reduced. By the action of the ground electrode provided on the plug receiver, it can be measured as a decrease in ground insulation, and it is possible to discover the progress of the tracking phenomenon at the time of periodic inspection.
In the plug receiver of the plug-in connector for wiring according to the second aspect, by providing the earth leakage breaker on the power supply side, the electric circuit can be automatically cut off and a fire due to tracking can be prevented.
In the plug receptacle of the wiring plug-in connector according to claim 3, a conductive portion is provided in a gap between the blade insertion holes of the main body, one end of the conductive portion is connected to the joining surface, and a ground terminal is provided at the other end. Since this conductive part is also used as a ground electrode, this ground electrode also directly acts on the tracking part inside the plug receiver of the wiring plug-in connector, and it is possible to discover the progress of the tracking phenomenon Becomes In the plug receiver of the wiring insertion connector according to the fourth aspect, since a part of the gap portion of the blade insertion hole is protruded from the surface of the joining surface, the plug receiver and the insertion plug of the wiring insertion connector can be used. Contact force can be strongly fixed, and even if the insertion plug is not firmly inserted into the blade insertion hole, the protrusion reliably functions as a ground electrode to discover the progress of the tracking phenomenon. It becomes possible.

[0009]

FIG. 1 is an external view showing a first embodiment in the case of an outlet of a kind of a plug receptacle of a wiring plug-in connector capable of monitoring tracking according to the present invention, and FIG. 2 is an electric circuit diagram. . As shown in the figure, a plug receiver 1 of a wiring plug-in connector according to the present invention includes a main body 2 and wirings 3a and 3 extending from the main body 2 and connected to a predetermined power supply (not shown).
b and the connecting surface 4 of the plug provided on the front surface of the main body 2
And Blade insertion holes 21 for inserting both blades (not shown) of the insertion plug into the main body 2 are provided on the main body 2.
Are formed with openings 41, 41 having portions corresponding to the blade insertion holes 21.

The main body 2 is formed of a plastic such as a phenol resin, and is fixed to a box made of a plastic such as vinyl chloride or a metal by a fixing tool 6 with screws. Further, in this embodiment, the joint surface 4 is formed in a plate shape from a material having conductivity, and a ground terminal 5 is attached to a part of the joint surface 4 so that the entire surface of the plate 4 serves as a ground electrode. Here, examples of the material having conductivity include stainless steel, copper, iron, carbon rubber, and conductive paint, but are not particularly limited in the present invention. The ground terminal 5 is grounded via a ground wire 51 to the ground.

In the above-described plug receiver of the first embodiment, when a tracking phenomenon occurs in the plug (not shown) or the plug receiver 1 of the wiring connector. The electric circuit is as shown in FIG. The power supply 7 is a one-sided ground power supply having a voltage (vector E ₁ ) and a ground resistance (R ₂ ), and is connected to the main body 2 through the current-operating type earth leakage breaker 8 via the wires 3 a and 3 b. . Reference numeral 9 denotes a plug for supplying power to devices 10 such as an electric pot. The energizing current at this time is (vector I _L ). The plate 4 serving as the ground electrode of the plug receiver 1 is grounded through the ground terminal 5 via the ground wire 51. In this case, the ground resistance is (R ₃ ), and at the same time, directly or through the plug 9 It is also connected to the tracking unit via dust, moisture, salt and the like between the joining surfaces with the tracking unit. In this case, the electric resistance between the blade receiver of the plug receiver 1 or the blade of the insertion plug 9 and the plate 4 is represented by ( _RT ). (R).

In calculation, (R ₂ ) and (R ₃ ) are usually constant at about 100Ω or less, while (R _T ) · (R)
Requires several KΩ or more for disaster prevention. At least it is sufficient to detect (R _T ) and (R) under such conditions.
₂ + R ₃ << _RT , and R ₂ + R ₃ << R in some cases. Here, the current flowing through the wiring 3a (vector I ₃₀ ), the current flowing through the wiring 3b (vector I ₃₁ ), the leakage current flowing through the ground wire 5 (vector I ₅ ), Assuming that the tracking current flowing through the ( _RT ) section is (vector _IT ), the following equations (Equation 1) and (Equation 2) hold.

[0013]

(Equation 1)

(Equation 2)

Accordingly, the detected current value (vector I ₀ ) of the earth leakage breaker 8 is as shown in (Equation 3), and
The leak current can be detected without connecting an ammeter directly to the device 1.

[0015]

(Equation 3)

The tracking current (vector I _T ) flowing through the tracking unit (R _T ) is expressed by the following equation.
When R ₂ + R ₃ << R _T and R ₂ + R ₃ << R, this is approximately represented by the following equation (Equation 4).

[0017]

(Equation 4)

In the above equation (4), (vector E ₁ ) and (R ₂ + R ₃ ) are substantially constant.
Since (R _T ) >> (R ₂ + R ₃ ), the tracking current (vector I _T ) is determined by (R _T ). On the other hand, the leakage current (vector I ₅ ) is substantially represented by the following equation (Equation ₅ ), where (R _T ) ≒ (R).

[0019]

(Equation 5)

In the above equation (5), (vector E ₁ ) and (R ₂ + R ₃ ) are substantially constant, and usually (R
₂ + Since R ₃₎ is << (R _T), the current leakage (vector I ₅₎ also becomes possible to be determined by a portion of the electrical resistance of the tracking unit (R _T), the equation (4) and (Expression From equation (5), the tracking current (vector I _T ) and the leakage current (vector I ₅ ) have almost the same magnitude, so that the tracking phenomenon progresses, the electric resistance (R _T ) decreases, and the tracking current (vector I _T ) decreases. ) Increases and heat generation becomes remarkable, and at the same time, the leakage current (vector I ₅ ) also increases. Accordingly, by setting the sensitivity current value of the earth leakage breaker 8 smaller than the value of the earth leakage current (vector I ₅ ) immediately before an accident such as a fire occurs, it is possible to automatically shut off before the accident occurs.

Further, even when a large amount of water drops is applied to the joint surface between the plug receiver 1 and the plug 9 of the wiring plug-in connector at one time, the joint surface 4 serving as the blade and the ground electrode can be used. The electrical resistance (R _T , R) becomes extremely small during this period, so that the earth leakage breaker 8 automatically shuts off before scintillation occurs. By the way, in FIG. 2, the earth leakage breaker 8 is opened,
Since a DC insulation resistance meter (not shown) is connected between the load side of the circuit breaker 8 and the ground, the action of the ground wire 51 and the ground electrode forms a closed circuit partially including the tracking unit. Can be measured.

[0022]

(Equation 6)

FIG. 3 is an external view showing a second embodiment of the plug receiver 1 of the wiring plug-in connector according to the present invention. In the second embodiment, the surface of a plastic body such as phenolic resin has openings 41 and 41 corresponding to the blade insertion holes 21 and 21 of the body 2 and is made of a material having conductivity such as stainless steel. The connecting surface 4 with the insertion plug is disposed, and a conductive member 11 such as copper is disposed in the gap between the blade insertion holes 21 inside the main body 2. This conductive member 11
A grounding terminal 5 is attached to one end of the substrate, and the other end is connected to the bonding surface 4 to form a ground electrode. Alternatively, the joining surface 4 and the main body 2
The conductive member 11 with the inside ground terminal 5 may be integrated by welding or the like and inserted into the main body 2. Further, the conductive member 11 and the bonding surface 4
May be provided by means of evaporating aluminum on the main body surface, or bonding or fitting conductive rubber. The main body 2 configured as described above is fixed in an embedding box made of plastic or metal such as vinyl chloride by a screw or the like with a fixture 6 made of metal or the like (not shown). Next, a plate having an opening at a joint portion with the insertion plug is fixed to the fixing tool by screwing or the like (not shown). The electric wires 3a and 3b are attached to the main body 2 and the ground wire 51 is attached to the ground terminal 5 by screwing or inserting, respectively, to obtain the plug receiver 1 of the wiring plug-in connector of the present invention.

In the plug receiver 1 of the wiring plug-in connector according to the second embodiment having the above-described structure, the ground electrode 11 provided with the ground terminal 5 is disposed so as to penetrate between the blade insertion holes 21. Therefore, the ground electrode also acts on the tracking portion in the plug receiver 1.

FIG. 4 is an external view showing a third embodiment of the plug receiver 1 of the wiring plug-in connector according to the present invention. In the third embodiment, in the plug receiver 1 of the wiring plug-in connector of the second embodiment, the conductive member 11 between the blade insertion holes 21 on the joint surface of the main body 2 with the insertion plug is provided. Has a structure in which a front end portion 11a of the first member 11 protrudes from the surface of the joining surface 4. The tip portion 11a of the conductive member 11 as described above
By protruding the plug, the contact force between the insertion plug and the ground electrode can be strongly fixed, and the action of the ground electrode can be reliably maintained even if the plug is slightly disconnected.
This projection is formed by bending with a press when a metal such as stainless steel is used as the conductive bonding surface 4.
Alternatively, a spring-like metal such as a coil spring is formed by a method such as screwing or welding, a method of providing an opening and combining it as a structure that can be stored therein, or simply attaching a metal piece or conductive rubber or the like. May be formed. In the embodiment shown in FIG. 1 and the like, the ground terminal 5 is provided on the main body (embedded box) 1, the fixture 6 and the main body (embedded box) 1 are made of a conductive material, and further, a metal screw or the like is used. For example, the workability at the time of plug construction may be enhanced by means such as electrical connection with the joint surface 4. Further, the upper body 12a as shown in FIG.
The upper body 12a is made of metal, and the upper body 12a is made of metal.
The ground terminal 5 and the ground wire 51 may be electrically connected to each other.

The above is the configuration of the plug receiver 1 of the plug-in connector for wiring according to the present invention. The present invention can be applied to all plug-in connectors for wiring, and the number of shapes is infinite. The present invention can also be applied to a plug-in type connector for equipment (JIS C 8358).

[0027]

As described in detail above, the invention according to claim 1 includes a main body in which a blade insertion hole of an insertion plug is formed, a wiring portion extending from the main body and connected to a predetermined power supply, A plug receiver for a wiring plug-in connector comprising: a joining surface with an insertion plug provided on a surface of the main body, wherein the joining surface is formed with a conductive part on a part or the entire surface. It is a grounding electrode and is connected to a ground terminal or a ground wire. It is a plug receiver for a wiring plug-in that can monitor tracking. The decrease in insulation between lines in the plug receptacle of the device can be measured as the decrease in ground insulation by the action of the ground electrode provided in the plug receptacle of the wiring plug-in connector. Can do To become. Therefore, the outlet itself,
Or, if tracking occurs in the plug, or even if the outlet is installed in a place where water drops are likely to adhere, such as in a bathroom or outdoors, further progress of tracking can be stopped and a fire is prevented from occurring It has an excellent effect that it can be performed. According to a second aspect of the present invention, there is provided a plug connector for a wiring plug-in connector capable of monitoring tracking according to the first aspect, wherein an earth leakage breaker is disposed between the main body and the power supply. In addition, the present invention has an excellent effect that the current is automatically cut off by the earth leakage breaker provided on the power supply side and a fire due to tracking can be prevented. In the invention according to claim 3, the joining surface is formed of a material having conductivity, and a conductive portion is provided in a gap between the blade insertion holes of the main body, and one end of the conductive portion is electrically connected to the joining surface. And a ground terminal or a ground wire is provided at the other end.
Since the plug described above is a plug receiver for the wiring plug-in connector that can monitor tracking, the conductive portion between the blade insertion holes is also used as a ground electrode, so tracking generated inside the plug receptacle of the wiring plug-in connector This ground electrode also acts on the part,
An excellent effect that it is possible to discover the progress of the tracking phenomenon is provided. The invention according to claim 4, wherein a part of a gap portion of the blade insertion hole in the joint surface is protruded from the joint surface. Since it is a plug receptacle for the connector, the contact force between the plug receptacle of the plug-in for wiring and the plug can be strongly fixed, and the plug is not firmly inserted into the blade insertion hole. In addition, there is an excellent effect that the protruding portion reliably functions as a ground electrode, and the progress of the tracking phenomenon can be found.

[Brief description of the drawings]

FIG. 1 is an external view showing a first embodiment of a plug receiver of a wiring plug-in connector capable of monitoring tracking according to the present invention.

FIG. 2 is an electric circuit diagram of a plug receiver of the wiring plug-in connector capable of monitoring tracking according to the present invention.

FIG. 3 is an external view showing a second embodiment of the plug receiver of the wiring plug-in connector capable of monitoring tracking according to the present invention.

FIG. 4 is an external view showing a third embodiment of a plug receiver of a wiring plug-in connector capable of monitoring tracking according to the present invention.

FIG. 5 is an external view showing another embodiment of the plug receiver of the wiring plug-in connector capable of monitoring tracking according to the present invention.

FIG. 6 is an external view showing an example of a conventional embedded outlet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug receptacle of wiring insertion connector 2 Main body 21 Blade insertion hole 3a Wiring 3b Wiring 4 Joining surface 41 Opening 5 Ground terminal 8 Earth leakage breaker

Claims (4)

(57) [Claims] 1. A main body in which a blade insertion hole of an insertion plug is formed, a wiring portion extending from the main body and connected to a predetermined power supply, and an insertion plug disposed on a surface of the main body. A connecting surface of the wiring plug-in connector, comprising a conductive portion formed on a part or the entire surface of the connecting surface to serve as a ground electrode and to be connected to a ground terminal or a ground wire. A plug receptacle for a wiring plug-in connector capable of monitoring tracking, which is characterized in that it is made. 2. The plug receiver of claim 1, wherein an earth leakage breaker is provided between the main body and the power supply. 3. The bonding surface is formed of a conductive material, and a conductive portion is provided in a gap between the blade insertion holes of the main body, and one end of the conductive portion is electrically connected to the bonding surface. 3. The plug receiver of claim 1, wherein the other end is provided with a ground terminal or a ground wire. 4. The wiring plug for monitoring tracking according to claim 1, wherein a part of a gap portion of the blade insertion hole in the joint surface is protruded from the surface of the joint surface. Plug receptacle for connector.