JP6049567B2 - Circuit breaker with earth leakage alarm - Google Patents

Description

  The present invention relates to a circuit breaker with a leakage alarm having a function of detecting a leakage current flowing in an AC circuit such as a distribution system and outputting an alarm.

  As is well known to those skilled in the art, a circuit breaker with a leakage alarm includes a main circuit connected to an AC circuit, an opening / closing part having an opening / closing mechanism for opening / closing the main circuit, and a leakage current flowing through the main circuit. A leakage detection circuit and an alarm output relay for outputting a leakage alarm to an external device such as a leakage alarm display device when the leakage detection circuit detects a leakage current are provided. In the circuit breaker with a leakage alarm as described above, if a leakage occurs and the alarm output relay is activated, the leakage circuit can be easily identified in order to investigate the cause when the leakage occurs. Proposals have been made in which a history of leakage operation remains even if a reset switch for turning off an alarm output relay is operated. For example, when a button operation determination unit that determines the content of the button operation performed on the operation display panel and the determination result of the button operation determination unit is an accident history display designation, the accident of the display designation from the accident history recording area The operation display panel includes a display information acquisition unit that acquires relay internal information including display information of a failure display lamp related to a history, and a relay internal information that includes the display information of the failure display lamp acquired by the display information acquisition unit. There is a power protection relay device that includes a failure display lamp and a display control unit that performs control to display on a display (see, for example, Patent Document 1).

JP 2010-28931 A (first page, FIG. 1)

  In the conventional technology as described above, the relay internal information including the display information of the failure indicator lamp at the time of the accident is also displayed when the accident history is selected and displayed, so that the relay status at the time of the accident remains unchanged. Although the effect of being able to reproduce and display in the state is obtained, there is a problem that the configuration is complicated, the circuit scale and the current consumption of the circuit increase, and the circuit space and cost increase.

  The present invention has been made to solve the above-described problems of the prior art, can display a leakage alarm history with a simple configuration, suppresses an increase in the maximum current consumption of the control circuit, and An object of the present invention is to provide a circuit breaker with a leakage alarm capable of suppressing an increase in space and cost due to an increase in circuit scale.

  A circuit breaker with a leakage alarm according to the present invention includes a leakage detection means for detecting a leakage flowing through a main circuit having an opening / closing portion, a leakage alarm output relay operated based on a detection signal of the leakage detection means, and Displays the earth leakage alarm display device activated by the operation of the earth leakage alarm output relay, the reset switch for returning the earth leakage alarm output relay to the non-operating state by applying the reset signal, and the earth leakage operation history stored in the storage device An earth leakage operation history display device is provided, and the earth leakage operation history display device is energized in response to application of the reset signal to the earth leakage alarm output relay in an operating state of the earth leakage alarm output relay.

  According to the circuit breaker for earth leakage alarm of the present invention, by activating the earth leakage operation history display device according to the application of the reset signal to the earth leakage alarm output relay in the operating state of the earth leakage alarm output relay, Since the leakage alarm output relay and the leakage alarm display device and the leakage operation history display device can be configured not to be energized at the same time, the increase in the maximum current consumption of the control circuit can be suppressed, and the space and cost due to the increase in circuit scale of the power supply circuit can be suppressed. Increase can be suppressed.

It is a circuit diagram which shows the principal part structure of the circuit breaker with a leakage alarm by Embodiment 1 of this invention. It is a circuit diagram which shows the principal part structure of the circuit breaker for earth leakage alarm as a reference example of this invention.

Embodiment 1 FIG.
1 is a circuit diagram showing a main configuration of a circuit breaker with a leakage alarm according to Embodiment 1 of the present invention. FIG. 2 is a circuit diagram showing a main configuration of a circuit breaker with a leakage alarm as a reference example of the present invention. In FIG. 1, a circuit breaker 1 with a leakage alarm includes a main circuit 4 that connects a power supply side connection terminal 2 and a load side connection terminal 3, an opening / closing part 5 that opens and closes the main circuit 4, A zero-phase current transformer 61 through which conductors of all phases are penetrated and a leakage current or a ground fault accident current (hereinafter simply referred to as a leakage current) flowing through the main circuit 4 is detected and a detected current is output from the secondary winding 61a. And a leakage detection circuit 62 for monitoring the detection current of the secondary winding 61a of the zero-phase current transformer 61 to determine whether there is a leakage or a ground fault (hereinafter simply referred to as leakage), and a leakage when a leakage occurs. The thyristor SCR1 that is turned on by the output signal of the detection circuit 62, and the leakage that outputs when the thyristor SCR1 is turned on and outputs a leakage alarm to an external device based on the output current of the secondary winding 61a of the zero-phase current transformer 61 Alarm output relay 7 and leakage alarm display device A certain LED 1 (hereinafter referred to as a leakage alarm LED 1), a transistor TR1 for turning them off, and a rectifier circuit that rectifies an AC voltage applied to the main circuit 4, and a DC voltage supplied from the rectifier circuit Control for reducing the voltage to a predetermined voltage and supplying stable electric energy to an internal circuit including the leakage detection circuit 62, the leakage alarm output relay 7, and the LED 2 as a leakage operation history display device (hereinafter referred to as a leakage operation history display LED 2). A power supply circuit 8 and a reset switch 9 are provided.

An AND circuit 10 that outputs an AND signal of an ON signal of the reset switch 9 and an operation signal of a circuit including the leakage alarm output relay 7; The thyristor SCR2 that is turned on by the output of the circuit 10, the earth leakage operation history display LED 2 that is activated when the thyristor SCR2 is turned on, the transistor TR3 for turning off the earth leakage operation history display circuit including these, and the transistor TR3 are turned off. The transistor TR4 and the ON delay timer 11 that outputs a time delay signal to the transistor TR4 when the ON operation of the reset switch 9 is continued for a predetermined time are provided. The zero-phase current transformer 61 and the leakage detection circuit 62 constitute a leakage detection means 6. Further, in this document, “leakage” includes a ground fault, and “leakage current” includes a ground fault current. Other configurations such as a drive mechanism for operating the opening / closing unit 5 are the same as those of the conventional one, and thus illustration and description thereof are omitted.
Here, the earth leakage operation history display LED2 as the earth leakage operation history display device is energized and turned on by the ON operation by the conduction of the thyristor SCR2, and is stored in a storage device (not shown) provided in the circuit breaker 1 with the earth leakage alarm. The earth leakage operation history generated by accumulating the earth leakage event records stored for each earth leakage alarm output operation in the earth leakage operation history storage area specified in (1) is displayed. The leakage event record created for each leakage alarm output includes the leakage occurrence time, the leakage factor, the display information of the leakage alarm display LED1 as the leakage alarm display device, etc., and a plurality of sequentially created leakage event records in time series Accumulated and saved and stored in the storage device as a leakage operation history.

  The circuit breaker 1 with a leakage alarm according to the first embodiment of the present invention configured as described above includes a three-phase AC circuit (leakage detected by the power supply side connection terminal 2 and the load side connection terminal 3). (Not shown). When a leakage occurs in the AC circuit to detect a leakage and a leakage current flows through the main circuit 4, a detection current is output from the secondary winding 61 a of the zero-phase current transformer 61 and input to the leakage detection circuit 62. . The leakage detection circuit 62 detects the occurrence of leakage based on the input detection current, turns on the thyristor SCR1, turns the control power source stepped down by the control power supply circuit 8 to the leakage alarm display LED1, the self-biased transistor TR1, and the leakage. Supply to the alarm output relay 7 to self-hold the output.

  Next, an operation for resetting, that is, returning the leakage alarm output relay 7 will be described. To reset the leakage alarm output relay circuit, the transistor TR2 is turned on by turning on the reset switch 9, and the transistor TR1 is turned off by turning on the transistor TR2, thereby turning off the transistor TR1. When the output of the leakage detection circuit 62 is OFF and the thyristor SCR1 is also turned OFF, the circuit including the leakage warning output relay 7 is turned OFF.

Next, the operation of the leakage operation history display will be described. When the operation signal of the circuit of the leakage alarm output relay 7 is input to the AND circuit 10, when the reset switch 9 is turned ON, the AND circuit 10 outputs, the thyristor SCR2 is turned ON, and the control power circuit 8 By supplying the self-biased control power source to the leakage current operation history display LED2 and the self-biased transistor TR3 to cause the power supply to self-hold, the leakage current operation history display LED2 is continuously lit.
The AND circuit 10 prevents the earth leakage operation history display LED 2 from operating unnecessarily when the reset switch 9 is turned on in a steady state with no earth leakage alarm output operation and no earth leakage operation history display operation.

  Next, an operation for resetting the leakage operation history display will be described. In order to reset the leakage current operation history display, when the reset switch 9 is continuously turned on, the ON delay timer 11 outputs with a time delay to turn on the transistor TR4, and the transistor TR4 is turned on to turn off the bias circuit of the transistor TR3. Thus, the transistor TR3 is turned OFF, and the operation signal of the circuit including the leakage alarm output relay 7 for the AND circuit 10 is turned OFF before the ON delay timer 11 is output when the reset switch 9 is turned ON. When the operation signal of the leakage alarm output relay circuit is turned off, the AND circuit 10 is also turned off, so that the thyristor SCR2 is also turned off, and the leakage action history display LED2 is turned off.

As described above, according to the first embodiment, the ground fault alarm output relay 7 that outputs a ground fault alarm based on the ground fault occurrence signal from the ground fault detection circuit that outputs the ground fault signal when the ground fault current detection level is equal to or higher than a predetermined value, and the ground fault alarm By starting the lighting of the earth leakage operation history display LED 2 by the AND circuit output of the operation signal of the display LED 1 and the ON operation signal of the reset switch 9, the earth leakage alarm output relay 7 and the earth leakage alarm display LED 1 are turned OFF, and at the same time, the earth leakage operation history The display LED 2 is turned on.
Further, the AND circuit 10 sets the operation signals of the leakage alarm output relay 7 and the leakage alarm display LED1 as the operation condition of the leakage operation history display LED2, so that the error of the leakage operation history display LED2 caused by pressing the reset switch 9 in a steady state. The lighting is prevented.
Further, the ON signal of the reset switch 9 to the transistor TR4 for turning off the leakage current operation history display LED2 is provided with a time difference via the ON delay timer 11, and the leakage current operation history display LED2 is turned OFF by continuously pressing the reset switch 9. The earth leakage alarm output relay 7 and the earth leakage alarm display LED1 are turned off and the earth leakage operation history display LED2 is turned on and off.

  In contrast to the first embodiment, the reference example shown in FIG. 2 includes an earth leakage alarm output relay circuit 7 including an earth leakage alarm output relay 7 and an earth leakage alarm display LED 1 and an earth leakage operation history display LED 2 based on the output of the earth leakage detection circuit 62. By operating the reset circuit 9 in parallel, turning off the reset switch TR1 and turning off the reset transistor TR3 with a time delay by the ON delay timer 11 by operating the reset switch 9 in parallel. By configuring the reset operation in two stages, one reset switch 9 is configured to share the leakage alarm output relay 7, the leakage alarm display LED1, and the leakage operation history display LED2 OFF. As described above, when the leakage alarm display LED 1 and the leakage operation history display LED 2 are configured to be displayed in parallel, although the configuration seems to be simple, the current consumption of the circuit increases, and the circuit breaker for the leakage warning wiring is provided. There is a problem that the circuit scale of the control power supply circuit 8 increases and the circuit space and cost increase, and the effect as in the first embodiment cannot be obtained.

As described above, according to the circuit breaker with a leakage alarm according to the first embodiment of the present invention, the leakage detection means including the leakage detection circuit 62 that detects the leakage flowing through the main circuit 4 having the switching unit 5; An earth leakage alarm display device comprising an earth leakage alarm output relay 7 activated based on a detection signal of the earth leakage detection means, an earth leakage alarm display LED 1 which is turned on and energized by the operation of the earth leakage alarm output relay 7, and reset An earth leakage operation history display device comprising a reset switch 9 for returning the earth leakage alarm output relay 7 to a non-operating state by application of a signal and an earth leakage operation history display LED 2 for displaying an earth leakage operation history stored in a storage device; An earth leakage operation history display LED 2 is formed by the output of the AND circuit 10 of the reset signal of the reset switch 9 and the operation signal of the leakage alarm output relay 7. By energizing and turning on the power history display device and causing the display operation to be performed, the leakage current is applied in response to the application of the reset signal to the leakage alarm output relay 7 in the operating state of the leakage alarm output relay 7. Since the operation history display device is energized, the leakage alarm output relay 7 and the leakage alarm display LED1 are reset in association with the ON operation of the leakage operation history display LED2, and the leakage alarm output relay circuit Since the earth leakage operation history display circuit is energized at the same time and both are not turned on, the current consumption of the added earth leakage operation history display circuit becomes the current consumption of the earth leakage alarm output relay circuit as in the reference example of FIG. It is not added up, and it is possible to add a function for displaying a leakage current operation history without increasing the maximum current consumption.
In addition, the operation of resetting the earth leakage alarm output relay 7 and the earth leakage alarm display LED1 and the operation of resetting the earth leakage operation history display LED2 and the reset operation are constituted by a single reset switch 9, so that the circuit breaker with the earth leakage alarm has an earth leakage operation history. It is possible to add a display function with good operability, small size, simplicity, and low cost.

In addition, when the reset switch 9 is turned ON, both the leakage alarm output relay 7 and the leakage alarm display LED1 are turned OFF and the leakage action history display LED2 is turned ON, and the leakage alarm output relay operation and the leakage alarm display LED1 and the leakage action history display are displayed. Since the LEDs 2 are not turned on at the same time, an increase in the maximum current consumption of the control circuit can be suppressed, and an increase in space and cost due to an increase in the circuit scale of the power supply circuit can be suppressed.
Moreover, the operation of the leakage alarm output relay 7 and the operation for turning off the leakage alarm display LED 1 and the switch for turning on and turning off the leakage current operation history display LED 2 are configured by one reset switch 9, so that the control circuit space and cost are reduced. Increase can be suppressed.
Further, the configuration of the reset switch 9 can be expected to prevent erroneous operation of the switch.

  Needless to say, the embodiment including the circuit diagram illustrated in FIG. 1 can be appropriately changed or modified within the scope of the present invention.

  1 Circuit breaker with earth leakage alarm, 2 Power supply side connection terminal, 3 Load side connection terminal, 4 Main circuit, 5 Switching part, 6 Earth leakage detection means, 61 Zero phase current transformer, 61a Secondary winding, 62 Earth leakage detection Circuit, 7 Earth leakage alarm output relay, 8 Control power supply circuit, 9 Reset switch, 10 AND circuit, 11 ON delay timer, LED1 Earth leakage alarm display device, LED2 Earth leakage operation history display device, TR1 transistor, TR2 transistor, TR3 transistor, TR4 transistor SCR1 thyristor, SCR2 thyristor.

Claims (2)

  An earth leakage detection means for detecting an earth leakage flowing through a main circuit having an opening / closing section, an earth leakage alarm output relay operated based on a detection signal of the earth leakage detection means, and an earth leakage alarm activated by the operation of the earth leakage alarm output relay A leakage switch including a display, a reset switch for returning the leakage alarm output relay to a non-operating state by applying a reset signal, and a leakage operation history display device for displaying a leakage operation history stored in a storage device, the leakage alarm output A circuit breaker with a leakage alarm, wherein the leakage operation history display device is energized in response to application of the reset signal to the leakage alarm output relay in an operating state of the relay.   A delay timer for delaying a signal of the reset switch, performing a return operation of the leakage alarm output relay when the reset switch is activated, energizing the leakage action history display device, and the delay caused by continuing the operation of the reset switch The circuit breaker with a leakage alarm according to claim 1, wherein the leakage current history display device is de-energized when there is a signal with a time delay from a timer.

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