JP4620240B2 - Circuit breaker with wiring alarm function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention detects a neutral phase failure in a single-phase three-wire circuit by detecting a leakage in a main circuit and outputting a warning signal to the outside in a circuit breaker with a leakage alarm function. The present invention relates to a structure for adding a function for shutting off.
[0002]
[Prior art]
Conventionally, the circuit breaker 31 with a leakage alarm function has a zero-phase current transformer 32 that detects leakage currents of the main circuits R, S, and T, and a detected current of the zero-phase current transformer 32 as shown in FIG. There is provided a printed circuit board 35 on which a leakage detection circuit 33 that detects leakage and outputs an alarm signal to the outside and a power supply circuit 34 that supplies power to the leakage detection circuit 33 are mounted. In order to add a neutral wire phase loss protection function to the circuit breaker 31 with a leakage alarm function, as shown in FIGS. 7 to 9, a printed circuit board 35, a leakage detection circuit 33, a power circuit 34, and a single phase are provided. The trip coil 38 which is excited by the output of the abnormal voltage detection circuit 36 and the trip coil 38 which are replaced with the printed circuit board 37 mounted with the abnormal voltage detection circuit 36 which detects the abnormal voltage due to the neutral wire phase loss of the three-wire circuit, and this trip coil A tripping device 41 comprising a plunger 40 that operates by excitation of 38 and drives a switching device 39 of the main circuits R, S, T, and a circuit breaker main body 42 when the main circuits R, S, T are shut off due to a phase loss. The phase loss display button 43 for projecting from the phase and displaying the phase loss and the phase loss test circuit 44 for confirming the operation of the neutral wire phase loss protection function had to be incorporated in the circuit breaker body 42. Lead wires 45 connecting the printed circuit board 37 to the tripping device 41, the phase loss test circuit 44, and the like are fixed by soldering.
[0003]
[Problems to be solved by the invention]
The above-mentioned conventional circuit breaker with a leakage alarm function has to prepare two types of printed circuit boards depending on the presence or absence of the phase loss protection function, and the printed circuit board 37 and the tripping device 41 are formed separately. However, the assembly workability was poor, and inventory management was complicated. Moreover, since the leakage detection circuit 33, the power supply circuit 34, and the abnormal voltage detection circuit 36 are mounted on one printed circuit board 37, there is no room for the arrangement of various components and patterns constituting the printed circuit board 37, and the leakage detection circuit Even if either one of 33 or the abnormal voltage detection circuit 36 breaks down, the entire printed circuit board 37 must be replaced, and only the components constituting the neutral wire phase loss protection function are taken out from the circuit breaker body 42. The performance test could not be done.
[0004]
[Means for Solving the Problems]
In view of the problems of the above conventional circuit breaker with a leakage alarm function, an object of the present invention is to easily incorporate a neutral wire phase loss protection function without replacing the printed circuit board of the circuit breaker with a leakage alarm function. Inventory management becomes easier, the layout of various parts and patterns that make up the printed circuit board can be afforded, parts can be replaced at low cost, and the neutral wire phase loss protection function can be inspected as a single unit. The circuit breaker with a leakage alarm function is provided, and its structure is a zero-phase current transformer that detects the leakage current of the main circuit, and detects the leakage based on the detected current of the zero-phase current transformer and In a circuit breaker with a leakage alarm function equipped with a leakage detection circuit that outputs an alarm signal, an abnormal voltage detection circuit that detects an abnormal voltage due to a neutral phase failure of a single-phase three-wire circuit, and an abnormal voltage detection circuit Trip driven by output A location, a phase loss display button for displaying a phase loss, a phase loss test circuit for operation check of the neutral phase failure protection and unit configuration as phase loss protection unit, the neutral wire open-phase protection see write set a phase loss protection unit to the breaker body in the case of addition is that which is adapted to supply a phase loss protection unit is supplied from the power supply circuit of the electric leakage detection circuit.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
According to the circuit breaker with a leakage alarm function according to claim 1, a zero-phase current transformer that detects a leakage current of the main circuit, and a leakage detected based on a detection current of the zero-phase current transformer In a circuit breaker with a leakage alarm function equipped with a leakage detection circuit that outputs an alarm signal, an abnormal voltage detection circuit that detects an abnormal voltage due to a neutral phase failure of a single-phase three-wire circuit, and an abnormal voltage detection circuit a trip device driven by the output, and unit configuration and open phase display button for displaying a phase loss, a phase loss test circuit for operation check of the neutral phase loss function as phase loss protection unit, neutral see write set a phase loss protection unit to the breaker body in the case of adding the Senketsusho protection, by which is adapted to supply a phase loss protection unit is supplied from the power supply circuit of the electric leakage detection circuit, with leakage alarm function Replace the circuit breaker printed circuit board. Without failing, the neutral wire phase loss protection function can be easily incorporated, inventory management becomes easier, the layout of various parts and patterns that make up the printed circuit board can be afforded, parts can be replaced at low cost, and phase loss The performance test can be performed with a single protection unit. Further, the assembly workability can be improved and the number of parts can be reduced.
[0006]
【Example】
An embodiment of a circuit breaker with a leakage alarm function according to the present invention will be described with reference to the accompanying drawings of FIGS.
[0007]
The circuit breaker 1 with a leakage alarm function includes a zero-phase current transformer 2 that detects the leakage currents of the main circuits R, S, and T, and detects a leakage based on the detected current of the zero-phase current transformer 2, There is provided a first printed circuit board 6 on which a leakage detection circuit 4 that warns of leakage by a display lamp or the like, outputs an alarm signal to the outside through an output line 3, and a power supply circuit 5 that supplies power to the leakage detection circuit 4 are mounted. In addition, when a neutral wire phase loss protection function is added to the circuit breaker 1 with a leakage alarm function, a phase loss protection unit 8 is incorporated in the circuit breaker body 7.
[0008]
The phase loss protection unit 8 is excited by a second printed circuit board 10 on which an abnormal voltage detection circuit 9 that detects an abnormal voltage due to a neutral phase loss of a single-phase three-wire circuit is mounted, and the output of the abnormal voltage detection circuit 9. Trip coil 11 and a tripping device 14 which is operated by excitation of the trip coil 11 and drives a switching device 12 of the main circuits R, S, T, and a main circuit R, S, T due to phase loss. The unit is composed of a phase loss display button 15 that projects from the circuit breaker body 7 when the circuit is interrupted and a phase loss test circuit 16 for confirming the operation of the neutral wire phase loss protection function. The printed circuit board 10 is fixed to the side surface of the bobbin 17 that holds the trip coil 11, and a phase loss indication button 15 that interlocks with the operation of the plunger 13, a switch 18 that constitutes the phase loss test circuit 16, Test button 19 for pressing the switch 18 is disposed on the upper surface of the bobbin 17.
[0009]
The phase loss protection unit 8 is connected to a lead wire 20 to supply power to each circuit and the trip coil 11, and a cylindrical contact terminal 21 is provided at the tip of the lead wire 20. Pins 22 project from the power supply circuit 5 of the first printed circuit board 6 so that the contact terminals 21 can be easily connected. The phase loss protection unit 8 drives the abnormal voltage detection circuit 9, the phase loss test circuit 16, and the trip coil 11 with the rectified power supplied from the power supply circuit 5. The circuit breaker 1 with a leakage alarm function can easily provide a neutral phase phase loss protection function by simply incorporating the phase loss protection unit 8 in the circuit breaker body 7 and connecting the lead wire 20 to the first printed circuit board 6. Added. By sharing the power supply circuit 5 with the leakage detection circuit 4, the number of parts of the second printed circuit board 10 can be reduced, and the workability of attaching the phase loss protection unit 8 can be improved.
[0010]
The operation of the phase loss protection unit 8 will be described. The abnormal voltage detection circuit 9 monitors the voltage of the lead wire 23 connected to the neutral wire S on the load side outside the circuit breaker body 7 and the lead wire 20 connected to the power supply circuit 5, and detects the abnormal voltage when the abnormal voltage is detected. The trip coil 11 is excited by the output from the circuit 9, and the plunger 13 is attracted into the trip coil 11 by the excitation of the trip coil 11. The plunger 13 drives the open / close device 12 of the main circuits R, S, T to cut off the main circuits R, S, T, and releases the engagement with the open phase display button 15 biased upward by the spring force. Then, the phase loss display button 15 projects from the circuit breaker body 7 to display the phase loss.
[0011]
The phase loss test circuit 16 includes a test resistor 24, a switch 18, and a test button 19. When the test button 19 protruding from the circuit breaker body 7 is pressed, the switch 18 is turned on and a pseudo abnormal voltage is applied to the phase loss test circuit 16. Will be tested. The phase loss protection unit 8 can perform a single performance test before being incorporated into the circuit breaker body 7 simply by supplying rectified power.
[0012]
In this embodiment, the lead wire of the phase loss protection unit and the first printed circuit board are connected by the contact terminal and the pin. However, there is no problem with the connection method such as soldering.
[0013]
Moreover, there is no limitation about the arrangement position of each component of a phase loss protection unit, and it can change suitably.
[0014]
【The invention's effect】
As described above, the circuit breaker with a leakage alarm function according to the present invention detects the leakage based on the zero-phase current transformer that detects the leakage current of the main circuit and the detected current of the zero-phase current transformer, and externally In a circuit breaker with a leakage alarm function equipped with a leakage detection circuit that outputs an alarm signal, an abnormal voltage detection circuit that detects an abnormal voltage due to a neutral phase failure of a single-phase three-wire circuit, and an abnormal voltage detection circuit a trip device driven by the output, and unit configuration and open phase display button for displaying a phase loss, a phase loss test circuit for operation check of the neutral phase loss function as phase loss protection unit, neutral see write set a phase loss protection unit to the breaker body in the case of adding the Senketsusho protection, by which is adapted to supply a phase loss protection unit is supplied from the power supply circuit of the electric leakage detection circuit, with leakage alarm function Neutral wire phase loss protection for circuit breakers Can be easily incorporated without replacing the printed circuit board, and because there is no printed circuit board to replace, inventory management becomes easier, and the leakage detection circuit and abnormal voltage detection circuit are installed. Since it is divided into two printed circuit boards, there is room for the arrangement of various parts and patterns that make up the printed circuit board, and even if either the leakage detection circuit or the abnormal voltage detection circuit fails, only the failed printed circuit board is replaced. It is economical and has an excellent effect that only the parts constituting the neutral wire phase loss protection function can be taken out of the circuit breaker body and performance can be inspected. Further, there are excellent effects that the assembly workability is improved and the number of parts can be reduced.
[Brief description of the drawings]
FIG. 1 is a front view showing a circuit breaker with a leakage alarm function according to the present invention.
FIG. 2 is a block diagram of a circuit breaker with a leakage alarm function according to the present invention.
FIG. 3 is a front view showing a phase loss protection unit according to the present invention.
FIG. 4 is a side view showing a phase loss protection unit according to the present invention.
FIG. 5 is a front view showing a first printed circuit board according to the present invention.
FIG. 6 is a block diagram of a conventional circuit breaker for wiring with a leakage alarm function.
FIG. 7 is a front view showing a conventional circuit breaker for wiring with a leakage alarm function.
FIG. 8 is a block diagram in which a neutral wire phase loss protection function is added to a conventional circuit breaker with a leakage alarm function.
FIG. 9 is a perspective view showing a conventional tripping device and a first printed board.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Circuit breaker for electric leakage with alarm function 7 Breaker body 8 Phase loss protection unit 9 Abnormal voltage detection circuit 10 Second printed circuit board 11 Trip coil 13 Plunger 14 Tripping device 15 Phase loss display button 16 Phase loss test circuit 17 Bobbin 18 Switch 19 Test button 20 Lead wire 21 Contact terminal 22 Pin 23 Lead wire 24 Test resistance

Claims (1)

For wiring with a leakage alarm function equipped with a zero-phase current transformer that detects leakage current of the main circuit and a leakage detection circuit that detects leakage based on the detected current of the zero-phase current transformer and outputs an alarm signal to the outside In a circuit breaker, an abnormal voltage detection circuit that detects an abnormal voltage due to a neutral phase loss of a single-phase three-wire circuit, a tripping device that is driven by the output of the abnormal voltage detection circuit, and a phase loss that indicates a phase loss The display button and the phase loss test circuit for checking the operation of the neutral wire phase loss protection function are configured as a phase loss protection unit, and the phase loss protection unit is added when the neutral wire phase loss protection function is added. see write set circuit breaker body, the breaker for earth leakage alarm function wires, characterized in that it has to be supplied power of the open phase protection unit from the power supply circuit of the earth leakage detecting circuit.

Images