JP4497530B2 - Power outlet with earth leakage breaker - Google Patents

Description

  The present invention relates to a power outlet provided with a function of detecting a spark discharge generated before tracking and preventing a tracking from occurring in addition to a function of detecting and blocking electric leakage in an electric circuit.

  Conventionally, as shown in Non-Patent Document 1, some power outlets have a built-in leakage breaker.

"Outlet bar flat blade type grounding type 2P 15A 125V HKC0230ELB" [online], American Electric Co., Ltd. [searched on June 28, 2004], Internet <URL: http://www.americandenki.co.jp/C /C9/C9.html>

  The power outlet with a built-in earth leakage breaker is a zero-phase current transformer for detecting the leakage current flowing in the circuit, a printed circuit board that implements a leakage detection circuit that detects the earth leakage based on the output signal of the zero-phase current transformer, Many components such as a blocking means for cutting off the electric circuit by the output signal of the detection circuit are required, and there is a problem that it is difficult to secure a space for adding a circuit for preventing further tracking.

The present invention relates to a receiving blade that sandwiches a plug blade of a plug and connects the plug to the electric circuit, a zero-phase current transformer that detects a leakage current flowing through the electric circuit, and a leakage signal detected by an output signal of the zero-phase current transformer In a power outlet with an earth leakage breaker provided with an earth leakage detection circuit and an interruption means for interrupting the electric circuit by an output signal of the earth leakage detection circuit , a conductive member is provided between the blades to detect a spark discharge generated between the blades. A sensor is provided, and the output line of the sensor is passed through the zero-phase current transformer and connected to one of the electric circuits, and the output current of the sensor is detected by the zero-phase current transformer.

According to the present invention, the receiving blade that connects the plug to the electric circuit by sandwiching the plug blade of the plug, the zero-phase current transformer that detects the leakage current flowing in the electric circuit, and the leakage current by the output signal of the zero-phase current transformer In a power outlet with an earth leakage breaker having an earth leakage detection circuit to detect and an interruption means to interrupt an electric circuit by an output signal of the earth leakage detection circuit , a conductive member between the blades to detect a spark discharge generated between the blades The sensor output line is passed through the zero-phase current transformer and connected to either one of the electric circuits, and the sensor output current is detected by the zero-phase current transformer. As a result, the tracking prevention function can be added without taking up much space.

  A power outlet with an earth leakage breaker is a grounding blade that sandwiches the plug blade and connects the plug to the electric circuit, a zero-phase current transformer that detects leakage current flowing in the circuit, and an output signal from the zero-phase current transformer. A leakage detecting circuit for detecting the electric current, a blocking means for cutting off the electric circuit by an output signal of the leakage detecting circuit, and a sensor for detecting a spark discharge generated between the plug blades, the sensor is formed by a conductive member such as a metal piece, Arranged between the receiving blades. The output line connected to the sensor passes through the zero-phase current transformer and is connected to one of the electric circuits. When spark discharge comes into contact with the sensor, current is generated, current flows through the output line, and when the current flowing through the output line is detected by a zero-phase current transformer, the leakage detection circuit outputs a signal to operate the cutoff circuit, Cut off the electrical circuit.

  A first embodiment of a power outlet with an earth leakage breaker according to the present invention will be described with reference to the attached drawing of FIG.

  A power outlet 1 with an earth leakage breaker includes a receiving blade 4 for holding a plug blade (not shown) of the plug and connecting the plug to an electric circuit 3 connected to an AC power supply 2, and a zero for detecting a leakage current flowing through the electric circuit 3. Occurs between the phase blade 5, the leakage detection circuit 6 that detects leakage by the output signal of the zero-phase current transformer 5, the blocking means 7 that blocks the electric circuit 3 by the output signal of the leakage detection circuit 6, and the plug blade A sensor 8 for detecting spark discharge is provided.

  The sensor 8 is formed of a conductive member such as a metal piece, and is disposed between the pair of receiving blades 4 and 4. An output line 9 connected to the sensor 8 passes through the zero-phase current transformer 5 and is connected to one of the electric circuits 3 via a resistor 10.

  When the spark discharge generated before tracking reaches the sensor 8, a minute current is generated and a current flows through the output line 9. The zero-phase current transformer 5 detects the output current of the sensor 8 and outputs a signal to the leakage detection circuit 6. When the leakage detection circuit 6 receives the signal from the zero-phase current transformer 5, the thyristor 11 is turned on, and when the thyristor 11 is turned on, the trip coil as the breaking means 7 is driven to open the switching contact 12 of the electric circuit 3. The electric circuit 3 is interrupted.

  Further, the power outlet 1 with the earth leakage breaker outputs a signal to the earth leakage detection circuit 6 when the leakage current flowing in the electric circuit 3 is detected by the zero phase current transformer 5, and the earth leakage detection circuit 6 is zero as in the case of the tracking interruption operation. When the signal from the phase current transformer 5 is received, the thyristor 11 is turned on, and when the thyristor 11 is turned on, the trip coil 7 is driven to open the switching contact 12 of the electric circuit 3 and the electric circuit 3 is interrupted.

  Thus, since the zero-phase current transformer 5, the leakage detection circuit 6, and the interruption means 7 constituting the leakage prevention function are used, the leakage current can be obtained simply by adding a metal piece as the sensor 8 and an electric wire as the output line 9. It is possible to add a tracking prevention function to a power outlet with a breaker, and since it takes up little space, the case is not enlarged and can be manufactured at low cost.

  A second embodiment of the power outlet with an earth leakage breaker according to the present invention will be described with reference to the attached drawing of FIG. In addition, the same part as Example 1 attaches | subjects the same code | symbol, and abbreviate | omits description.

  In this embodiment, the diode 13 a of the photothyristor 13 is connected to the output line 9 of the sensor 8, and the LED 14 is connected to the thyristor 13 b of the photothyristor 13.

  Thus, when a current is output from the sensor 8 to the output line 9, the diode 13 a of the photothyristor 13 is energized to turn on the thyristor 13 b, and the power supply circuit 15 connected to the power supply side circuit 3 from the switching contact 12. When the thyristor 13b is energized, the LED 14 is turned on. Therefore, when the LED 14 is lit when the power outlet 1 with a leakage breaker is cut off, it can be determined that the tracking is cut off, and when the LED 14 is not turned on, it can be determined that there is a leakage.

It is a circuit diagram of the power socket outlet with an earth leakage breaker according to the first embodiment of the present invention. It is a circuit diagram of the power socket outlet with an earth leakage breaker concerning Example 2 of the present invention.

DESCRIPTION OF SYMBOLS 1 Power supply outlet with earth leakage breaker 5 Zero phase current transformer 6 Earth leakage detection circuit 7 Circuit breaker 8 Sensor 9 Output line 11 Thyristor 12 Open / close contact 13 Photothyristor 14 LED

Claims (1)

A receiving blade that sandwiches the plug blade of the plug and connects the plug to the electric circuit, a zero-phase current transformer that detects a leakage current flowing in the electric circuit, and an electric leakage that detects an electric leakage by an output signal of the zero-phase current transformer In a power outlet with an earth leakage breaker provided with a detection circuit and an interruption means for interrupting an electric circuit by an output signal of the earth leakage detection circuit , a conductive member between the blades for detecting a spark discharge generated between the blades The sensor output line is passed through the zero-phase current transformer and connected to one of the electric circuits, and the output current of the sensor is detected by the zero-phase current transformer. A power outlet with an earth leakage breaker.

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