JP2006048966A - Power outlet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power outlet which can be reduced in size and manufacture cost and can save troublesome installation. <P>SOLUTION: In a power outlet 1, a sensor 7 placed between receiving blades 4, 4 in an outlet case 10 detects a spark discharge through a through-hole 15 dug in the front of the outlet case 10, and a tracking detection circuit 8 finds a tracking from an output current of the sensor 7, to output a signal to a simulation current output circuit 9. When receiving the signal, the simulation current output circuit 9 feeds a simulation current to a grounding terminal 6, activates an earth leakage circuit breaker 13 placed in a distribution panel, and breaks a power line 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power outlet that detects a spark discharge that occurs before tracking and prevents the occurrence of tracking.

  Conventionally, there is a power outlet shown in Patent Document 1 having a function of preventing tracking. In Patent Document 1, a conductive plate is disposed between the receiving blades on the front surface of the power outlet, one end protrudes from the surface, and the other end is connected to the ground terminal, so that when a spark discharge occurs before tracking occurs. The electric current flowing between the two blades of the plug is passed through the conductive plate to the ground terminal, and the electric leakage breaker is detected as the electric leakage current to interrupt the electric circuit.

JP 2001-35599 A

  In the conventional power outlet, the conductive plate, which is a sensor that detects spark discharge that occurs before tracking, is exposed on the surface of the power outlet. It is also possible that the plug user's hand will come into contact, which is not preferable. In addition, since the conventional power outlet is directly connected to the sensor and the ground terminal, the current could not be detected unless a current of about 15 mA to 30 mA enabling the leakage breaker to flow between the plug blades continuously for a predetermined time. In view of this, the present applicant has proposed, in Japanese Patent Application No. 2003-157070, a power outlet that is built in the case so that the sensor is not exposed, and that even the discontinuous spark discharge in the initial stage is detected to operate the breaker. However, this power outlet has the disadvantage that it is costly to incorporate a breaker and the external dimensions become large, and it is necessary to wire a signal line to the breaker to operate the breaker of the distribution board. There was a drawback that it took time and effort.

  The present invention includes a receiving blade that sandwiches a plug blade of a plug and connects the plug to an electric circuit, a ground terminal to which a ground wire is connected, a sensor that detects a spark discharge generated between the plug blades, and an output current of the sensor And a tracking detection circuit that outputs a signal when tracking is detected, and a power outlet that detects spark discharge through the through hole provided in the outlet case where the sensor is placed and the sensor is placed in the outlet case. , A pseudo-current output circuit that outputs a pseudo-current when receiving the output signal of the tracking detection circuit is supplied, and the pseudo-current output from the pseudo-current output circuit is caused to flow to the ground terminal, and the earth leakage breaker installed on the distribution board is operated. The circuit is cut off.

  A receiving blade that plugs the plug blade and connects the plug to the electrical path, a ground terminal to which the ground wire is connected, a sensor that detects spark discharge generated between the plug blades, and tracking is detected by the output current of the sensor Then, a tracking detection circuit that outputs a signal is provided. The sensor is placed in the outlet case, and a through hole is provided in the front of the outlet case where the sensor is arranged, and tracking detection is detected at a power outlet that detects spark discharge through the through hole. Equipped with a pseudo-current output circuit that outputs a pseudo-current when receiving an output signal from the circuit. The pseudo-current output from the pseudo-current output circuit is supplied to the ground terminal, and the earth leakage breaker installed on the distribution board is activated to cut off the circuit. As a result, there is no built-in breaker in the power outlet, so the external dimensions of the power outlet can be reduced and manufacturing costs can be reduced. Reduced, there is an effect that Thus also is not time-consuming to construction does not require wiring of the signal line to the breaker.

  A receiving blade that plugs the plug blade and connects the plug to the electrical path, a ground terminal to which the ground wire is connected, a sensor that detects spark discharge generated between the plug blades, and tracking is detected by the output current of the sensor Then, a tracking detection circuit that outputs a signal is provided. The sensor is placed in the outlet case, and a through hole is provided in the front of the outlet case where the sensor is arranged, and tracking detection is detected at a power outlet that detects spark discharge through the through hole. Equipped with a pseudo-current output circuit that outputs a pseudo-current when receiving an output signal from the circuit. The pseudo-current output from the pseudo-current output circuit is supplied to the ground terminal, and the earth leakage breaker installed on the distribution board is activated to cut off the circuit. To do.

  A first embodiment of a power outlet according to the present invention will be described with reference to the accompanying drawings of FIGS.

  A power outlet 1 includes a receiving blade 4 for connecting a plug to an electric circuit 3 connected to an AC power supply 2 by holding a plug blade (not shown), a ground terminal 6 to which a ground wire 5 is connected, a plug A sensor 7 that detects a spark discharge generated between the blades, a tracking detection circuit 8 that outputs a signal when tracking is detected by the output current of the sensor 7, and a pseudo that outputs a pseudo current when receiving an output signal of the tracking detection circuit 8 A current output circuit 9 is provided and housed in an outlet case 10.

  The outlet case 10 includes a main body 10a and a cover 10b. A pair of plug insertion ports 11 and a ground plug insertion port 12 are provided on the front surface of the cover 10b, and a receiving blade 4 is disposed inside the plug insertion port 11. A ground terminal 6 is disposed inside the ground plug insertion opening 12. The receiving blade 4 has the other end of the power cable 14 connected at one end to the load side terminal of the earth leakage breaker 13 installed in the distribution board (not shown), and the ground terminal 5 is connected to the grounded ground wire 5. ing.

  Further, a through hole 15 is formed between the respective plug insertion openings 11 and 11, and the sensor 7 is disposed between the receiving blades 4 and 4 inside the through hole 15. The sensor 7 is formed of a conductive member such as a metal piece, and the output line 16 connected to the sensor 7 is connected to the tracking detection circuit 8.

  The pseudo current output circuit 9 includes a resistor 17 and a thyristor 18. One end of the resistor 17 is connected to one electric circuit, and the other end is connected to the anode of the thyristor 18 via a rectifier diode 19. The thyristor 18 has a gate connected to the tracking detection circuit 8 and a cathode connected to the ground terminal 6.

  The circuit operation from the occurrence of a spark discharge to the shut-off operation will be described. Dust accumulates between the plug blades of the plugs connected to the receiving blades 4 and 4 to absorb moisture in the air, thereby interposing moisture between the plug blades. A minute electric current flows, and the charged water vaporizes, generating a spark discharge. When a spark discharge enters through the through hole 15 and contacts the sensor 7, a minute current is generated and a minute current flows through the output line 16. When the tracking detection circuit 8 detects tracking from this output current, it outputs a signal to the pseudo current output circuit 9. This signal is input to the gate of the thyristor 18, turning on the thyristor 18, and a pseudo current of about 30 mA that allows the leakage breaker 13 to operate flows through the ground wire 5. Thereby, the earth leakage breaker 13 detects the earth leakage and interrupts the electric circuit 3.

1 is a block diagram of a power outlet according to the present invention. It is a front view of the power outlet concerning the present invention. It is the sectional view on the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power outlet 4 Receiving blade 5 Ground wire 6 Ground terminal 7 Sensor 8 Tracking detection circuit 9 Pseudo current output circuit 13 Earth leakage breaker

Claims (1)

  A receiving blade that sandwiches the plug blade of the plug and connects the plug to the electric circuit, a ground terminal to which a ground wire is connected, a sensor that detects a spark discharge generated between the plug blades, and an output current of the sensor A power supply for detecting a spark discharge through the through hole provided in the outlet case with the sensor disposed in the outlet case, and a tracking detection circuit for outputting a signal upon detecting the tracking. The outlet includes a pseudo-current output circuit that outputs a pseudo-current when receiving the output signal of the tracking detection circuit, and causes the pseudo-current output from the pseudo-current output circuit to flow to the ground terminal and is installed in a distribution board A power outlet characterized by operating a breaker to cut off the electric circuit.

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