JPS6118297B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is used to install and use an existing outlet installed at the end of a wiring in order to prevent an earth leakage or disconnection from breaking the circuit when a ground fault current occurs due to an earth leakage accident or the like in the circuit. This relates to a plug-type earth leakage cutter or disconnector, and conventionally, the components of this type of earth leakage cutter or disconnector, such as a ladder or disconnector, are arranged in a plane and fixed to a device stand for assembly. In other words, the front disconnector is roughly divided into the front zone, center zone, and rear zone, and the power plug is placed in the center of the front zone, and the outlet is placed in the center of the rear zone, and the center zone is further divided into the left zone. and the right dividing band,
The left partition has an opening/closing mechanism and a tripping mechanism.
In the adjacent right-hand section, a method is used in which the amplifying section, zero-phase current transformer, and test circuit are arranged in a plane, but such a planar arrangement requires a lot of space for the breaker and It has a wide shape and is difficult to downsize. Furthermore, the primary conductor passing through the zero-phase alternator is
The wiring crosses the border from the left section to the right section, and then crosses the border to the rear section, resulting in a so-called meandering wiring. As is well known, a zero-phase current transformer detects the unbalanced current flowing through the primary conductor and generates a secondary output. However, when the primary conductor has a meandering wiring as described above, the current flowing through the primary conductor The magnetic flux does not act uniformly on the zero-phase current transformer, creating a simulated unbalanced state even though it is in an equilibrium state, and a secondary output is generated in the zero-phase current transformer. It is difficult to manufacture the disconnector. Furthermore, since the assembly is done by arranging the parts flatly and fixing them to the stand, it requires a large number of assembly man-hours, and the simulated unbalanced state caused by the meandering wiring of the primary conductor mentioned above occurs, so after the assembly is completed, the sensitivity current etc. This made assembly and adjustment difficult. Furthermore, since the primary conductor is bent and meandered during assembly, assembly is difficult and the insulation coating of the primary conductor is damaged, resulting in a reduction in insulation performance. Furthermore, in order to arrange the power plug in the center of the front compartment, there is a problem that the shape of the parts becomes complicated because it is necessary to connect the power plug to the fixed contact that constitutes the opening/closing mechanism section arranged in the left compartment.

The present invention eliminates these drawbacks by dividing the shield breaker into front and rear sections approximately in the center, and the front section includes a power plug, an opening/closing mechanism, and an electromagnet for operating the opening/closing mechanism. The tripping mechanism and the upper end of the electromagnet frame are arranged as fixed electrodes of the test switch, making it possible to reduce the width and size. The amplifying part that amplifies the secondary output of the phase current transformer and the movable electrode of the test switch are three-dimensionally mounted on a mounting base and arranged as one body, and the mounting base is held and fixed between the equipment base and the cover. As a result, the components can be concentrated and integrated in each section, making it possible to downsize and making assembly work extremely easy.Furthermore, in the mounting base installed in the rear partition band, it is possible to divide the upper and lower parts into the mounting base. A pair of vertical ribs are formed facing each other in the upper section of the partition, and the primary conductor is guided to the center of the zero-phase current transformer and passes through it orthogonally. Since it is arranged symmetrically on the outside of the vessel to prevent the occurrence of a simulated unbalanced state, there is no need for adjustment after assembly, making assembly and adjustment extremely easy and extremely effective for highly sensitive earth leakage and disconnection production. .
Furthermore, the pair of vertical ribs mutually insulates and reinforces the connection outlet fitting, the zero-phase current transformer, and the primary conductor, and is extremely effective in preventing insulation failure due to aging and improving insulation performance. Furthermore, a box with an opening on one side is formed in the lower section of the mounting base, and after storing the widening section, it is filled with resin and solidified to provide mechanical reinforcement as a mounting base for the components placed in the upper section. The electronic components used in the widening section were shielded from the ambient air where the breaker was installed to prevent deterioration over time and ensure stable performance over a long period of time.

Referring to the drawings listed below as embodiments of the present invention, A is a plug-type earth leakage switch main body, which is composed of a base 1 and a cover 2 both molded from synthetic resin, and has internal parts. After assembly and adjustment, they are fixed to each other. Here, this table 1 is divided into front and rear parts at approximately the center B-B of the edge and cutter, with C indicating the front section and D indicating the rear section. First, to explain the front section C, 3 has a fixed contact 4 fixed to the horizontal end bent into an L shape, and the vertical end is an input terminal that passes through the device stand and has a power plug 5 protruding from the lower end. and cover 2
The projecting piece 6 provided at the lower end of the holder is pressed and fixed. Reference numeral 7 denotes a main bearing, the lower end of which is screwed and fixed to the instrument stand, and the upper end of which a handle 9 is rotatably pivoted by a pivot 8. The handle 9 has a handle window 10 provided in the cover 2 at the upper end.
An operating arm 11 protruding from the holder and a lower end thereof are pivotally connected by a pivot 12 together with a presser plate spring 14 which urges a presser plate 13 to rotate clockwise. The presser plate 1
3 is provided with an inclined pressing surface 15 and a sliding end 16 at the lower part. Reference numeral 17 denotes a claw piece, which is pivotally attached to the lower part of the main shaft support by a pivot 19 together with a claw spring 18 that urges the claw piece to rotate counterclockwise. Sliding surface 2 on which the end 16 slides up and down
An engaging end 21 is formed at the upper end. 22 is provided with a locking end 23 at one end that engages with the engaging end 21 of the claw piece and prevents the claw piece from rotating clockwise, an operating arm 24 at the other end, and a protruding shaft approximately in the center. The pawl support is provided with a pawl support 25, and the pawl support is pivoted at approximately the middle stage of the main shaft support together with a pawl support spring 26 biased to rotate counterclockwise. Reference numeral 27 denotes an extension end obtained by extending the horizontal surface of the lower end of the main shaft bearing, and a through hole 28 and a screw hole 29 are provided in the center and eccentrically in the left direction. 30 is an electromagnetic iron piece whose free end 31 faces the working arm 24 of the pawl support, and the rising surface of an electric iron spring 32 having a spring plate bent into an L shape is fixed to the base end, and the horizontal surface of the iron piece spring is an electromagnetic iron piece. The free end 31 of the electromagnet frame 33 is urged to rotate counterclockwise and fixed to the main bearing with a screw 41 inserted through the through hole 28. 34 is the magnetic pole 35
is an electromagnet that faces approximately the middle of the electromagnetic iron piece, and the other end is fixed to approximately the middle of the vertical piece 36 of the electromagnetic right frame.The electromagnet 34 attracts the electromagnetic iron piece with electromagnetic force excited by the secondary output of the widening part. Then, the free end 31 is rotated clockwise to activate the tripping mechanism. 37A, 3
7B is a pair of movable contact plates made of a highly conductive spring material, and a movable contact 38 facing the fixed contact 4 is fixed to the free end, and a spring force is applied in the direction of separating from the fixed contact. The base end is fixed and connected to a pair of primary conductors 39A and 39B. Here, as a method of fixing the base end of the movable contact plate, the one pole movable contact plate 37A is screwed into the screw hole 29 provided at the extension end of the lower end of the main bearing with the mounting screw 40A, and the other pole movable contact plate 37B is fixed directly. Fix it to the base using mounting screws 40B. Although the embodiment of the present invention is described as a type exclusively for ground fault protection, it is also possible to manufacture a type for both overcurrent protection and ground fault protection, which has the function of operating due to circuit overcurrent as described below. be. That is, the base end of the operating bimetal used as the overcurrent tripping element and the base end of the movable contact plate are overlapped and fixed using the aforementioned mounting screws 40A and 40B, respectively.
By connecting a primary conductor to the vertical free end and facing the working arm 24 of the pawl support, when an overcurrent occurs in the circuit, the operating bimetal generates more than a specified amount of heat due to Joule heat, and the free end of the operating bimetal curved in the direction, abuts on the working arm 24, and the claw piece support 2
2 is rotated clockwise to activate the tripping mechanism, it is possible to manufacture a combined type of earth fault protection and overload protection in which the electromagnetic iron piece operates for ground fault current and the bimetal operates for overcurrent. Reference numeral 42 denotes a test switch fixed electrode provided at the upper end of the vertical piece of the electromagnet frame 33, and the fixed electrode 42 is connected to the one-pole movable contact plate 37 as described above.
Since A and the electromagnet frame 33 are both fixed to the main bearing, the zero-phase current transformer is charged to the same potential as the left pole on the power supply side. Reference numeral 43 denotes a test switch movable electrode that faces the fixed electrode and is biased in the direction of separation, and that comes into contact with the press of a test button 45 that protrudes outside from a window 44 provided in the cover 2. Fixed to the mounting base and test circuit resistor 68
is connected to the other pole on the load side of the zero-phase current transformer.

By using the test circuit configured as described above, the test switch fixed electrode has a reduced number of components compared to a method using dedicated components, and does not require a means for connecting to a live part using a lead wire, thereby improving work efficiency. In addition, since the test circuit was constructed by connecting the movable electrode to the other pole on the load side of the zero-phase current transformer via the test circuit resistor 68, it was necessary to pass the test circuit lead wire through the zero-phase current transformer. This improves work efficiency and is effective in downsizing.

Reference numeral 46 denotes a cross bar made of synthetic resin, which is incorporated so that it can only move up and down using a vertical groove 47 formed of a vertical wall provided in the table 1 as a guide. The lower end of the cross bar 46 is connected to the movable contact plate 37A,
The base end and the free end of 37B come into contact with each other approximately at the center thereof, and are urged upward. The cross bar is pushed up by the bias, and the upper end abuts against a stopper 48 provided on the main bearing to restrict upward movement beyond a specified limit, and the center is pressed against the inclined pressing surface 1 of the holding plate.
5, and is pressed down by operating the handle to bring the movable contact and the fixed contact into contact.

Next, explaining the rear partition D, reference numeral 49 denotes a synthetic resin mounting base, which is divided into an upper partition E and a lower partition F by a partition wall 50. The lower section F of the mounting base forms a box body 51D with one opening by the side walls 51A, 51B, and 51C, and after the widening portion 52 is housed in the box body, it is filled with resin and fixed. By being solidified in this way, the widening part is shielded from the atmosphere in which the shatter breaker is installed, preventing deterioration over time, ensuring stable performance over a long period of time, and making it suitable for the above-mentioned zone described later. It provides mechanical reinforcement as a mounting base for the parts to be placed, further increasing reliability. In the upper zone E, 53 is a fitting chamber formed by opposing a pair of vertical ribs 54A and 54B, and the fitting chamber is arranged approximately in the center of the upper zone, into which the zero-phase current transformer 55 is fitted. Further, the pair of vertical ribs are connected to the base ends of the movable contact plates 37A, 37B, and a pair of primary conductors 39A, 39B crossing the rear zone are fitted, and the primary conductors cross the zero-phase current transformer orthogonally. The connection outlet fitting 5 connects the other end of the primary conductor to the narrow groove 56 which is guided to pass through the primary conductor.
Outlet receptacles 59 are provided at both ends of the connecting piece 58 so that 7 is arranged symmetrically with respect to the zero-phase current transformer.
A fitting frame 60 is formed into which the fitting frame 60 is fitted.

As mentioned above, by passing the primary conductor orthogonally through the zero-phase current transformer and arranging the connecting outlet fittings symmetrically with respect to the zero-phase current transformer, assembly is easy and the primary conductor And because the magnetic flux caused by the current flowing through the connected outlet fittings acts uniformly on the zero-phase current transformer, it is easier to manufacture ultra-high-sensitivity leaks and breakers than with a meandering primary conductor, and it is also easier to assemble and adjust. In addition to being extremely effective in producing electrical leakage and disconnectors with stable performance, the vertical ribs also serve as electrical insulation between the connecting outlet fitting, the zero-phase current transformer, and the primary conductor, preventing insulation failure due to aging. Extremely effective in shock wave withstand voltage ability. Reference numeral 61 denotes a fixing groove for the test switch movable electrode formed of the fixing base 62 and the vertical wall 63, into which the vertical base end 64 of the test switch movable electrode 43 bent in a dogleg shape is fitted. The horizontal base end 65 is pressed and fixed to the fixing base 62 by a pressure contact end 66 provided on the inner surface of the cover.

Here, the free end 67 of the movable electrode 43 faces the fixed electrode 42 as described above, is biased in the separation direction, and comes into contact with the fixed electrode when the test button 45 is pressed. Furthermore, one outlet wire 69 of the test circuit resistor 68 is connected to the base end of the movable electrode 43, and the other outlet wire is connected to the load side with respect to the zero-phase current transformer and to the pole on the opposite side of the fixed electrode. . 70 is the zero-phase current transformer secondary output lead wire, 71 is the secondary output lead wire of the widening section, and 72A, 72B are connected to the trip coil.
is the control power supply lead wire of the widening section, and connect 72A to the same potential pole as the test switch fixed electrode, and 72B to the different pole. In addition, both of the control power lead wires are connected to the connection hole 7 provided in the center of the connection piece of the connection outlet fitting.
3 by soldering or other methods. Reference numeral 74 denotes an outlet socket window provided in the cover, which faces the outlet socket 59 and guides the plug 76 of the protected device 75. The mount is fitted into the inner surface of the holder and is prevented from moving forward, backward, left or right by the side walls and the partitioning ribs 78, and is held and fixed by being pressed by the inner wall of the cover.

To explain the usage and operation of the plug-type earth leakage switch and disconnector of the present invention constructed as described above, first, the usage method is as shown in Fig. 1.
Insert the power plug 5 of the plug-type earth leakage/disconnector of the present invention into 7, and further insert the plug 76 of the protected device 75 from the outlet socket window 74 of the device into the outlet socket 59 to perform installation. Complete.

Next, to explain the operation, FIG. 6 shows an open state, and the fixed contact 4 and the movable contact 38 are separated from each other. From the above state, in order to close the breaker,
As the operating arm 11 of the handle 9 is reversed counterclockwise, the presser plate 13 is lowered while the sliding end 16 slides on the sliding surface 20 of the claw piece. Therefore, in order to join the fixed contact 4 and the movable contact 38 by lowering the crossbar 46 that contacts the inclined pressing surface 15 and pressing the movable contact plates 37A and 37B, and to maintain this state, the contact pressure and The pushing up force of the cross bar 46 due to the return force of the movable contact plate in the separating direction acts on the inclined pressing surface 15 of the holding plate. Here, since the force line diagram of the inclined pressing surfaces of the pivots 8 and 12 is set in an inverted dogleg shape, a component force is generated that rotates the handle counterclockwise, and in response to this component force, the pressure plate spring rotates the handle clockwise. Since the rotational force of is set small, the closed circuit state shown in FIG. 7 is maintained. When opening the pole at the front, the operating arm 11 is rotated clockwise with a force exceeding the force for maintaining the closed state.

Subsequently, in the closed circuit state shown in FIG. 7, when a ground fault current occurs due to leakage, the primary conductors 39A and 39B
The current flowing through becomes unbalanced, this unbalanced current is detected by the zero-phase current transformer 55, and the zero-phase current transformer transmits the secondary output to the amplifying section 52, where the unbalanced current exceeding the specified value is detected. When the
The electromagnet 34 is excited and the electromagnetic iron piece 30 is driven by electromagnetic force. The free end 31 of the electromagnetic iron piece contacts the working arm of the pawl support and rotates the pawl support clockwise.

Thereby, the engagement between the locking end 23 and the engaging end 21 is released. Here, in the closed circuit state, the presser plate is biased clockwise by the force exerted by the inclined pressing surface 15, so the presser plate rotates clockwise and releases the pressure on the crossbar. , the movable contact plates 37A and 37B are rotated clockwise by the urging force in the separating direction, and the fixed contact and the movable contact are separated, and the handle is moved by the holding plate spring 14 and the claw piece spring 1.
8 rotates clockwise to open the circuit.

Furthermore, to explain the test operation to confirm the normal operation of the breaker, the fixed electrode 42 of the test switch is at the same potential as one pole (left pole in the figure) on the power supply side with respect to the zero-phase current transformer, as mentioned above. , and since the movable electrode 43 of the test switch is connected to the other pole on the load side (the right pole in the figure) of the zero-phase current transformer via the test circuit resistor 68, the test button 45
When the movable electrode comes into contact with the fixed electrode of the test switch and closes the test circuit, the current flowing through the primary conductor becomes unbalanced, causing the heel breaker to open, similar to the operation caused by the leakage described above.

As described above, the present invention divides the plug-type earth leakage cutter main body A into front and rear sections approximately at the center B-B, and the front section C includes the power plug 5, the opening/closing mechanism section 79, and the opening/closing mechanism section. The tripping mechanism section 80 including the electromagnet 34 and the upper end of the electromagnet frame 33 are positioned as the fixed electrode 42 of the test switch. Primary conductors 39A and 39B that cross the border from band C and pass through the zero-phase current transformer 55, a connecting outlet fitting 57 connected to the load side of the primary conductor and disposed outside the zero-phase current transformer, and the The amplifying part 52 that amplifies the secondary output of the zero-phase current transformer and the movable electrode 43 of the test switch are three-dimensionally mounted on a mounting base 49 and arranged as one body, and the mounting base is connected to the equipment base 1. Because it is held and fixed with the cover 2, it is easier to assemble because the components can be concentrated and integrated in each section, compared to the conventional method of arranging them flat and fixing each component to the container stand. Moreover, it is extremely effective in reducing the width and size. Furthermore, in the mounting base 49 described in claim 2, the mounting base is provided with a partition wall 50 that separates the upper and lower parts, and the upper partition band E of the partition wall has a pair of vertical ribs 54.
A and 54B are formed facing each other, and the vertical rib has a fitting chamber 53 in which the zero-phase current transformer is located in the center, and a narrow groove 56 that guides the primary conductor to the center of the zero-phase current transformer and passes through it orthogonally. It consists of a fitting frame 60 for disposing a pair of connecting outlet fittings 57 symmetrically on the outside of the zero-phase current transformer, and insulating the connecting outlet fittings from the zero-phase current transformer and the primary conductor from each other, and further A box body 51D with one opening is formed in the lower zone F, and after housing an amplifying part 52 for amplifying the secondary output of the zero-phase current transformer, the box body is filled with resin and solidified. The present invention provides a plug-type earth leakage/disconnector that can be made smaller, easier to assemble and adjust, and has stable performance than conventional ones.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of the state in use, Fig. 2 is a circuit diagram, Fig. 3 is a front view, Fig. 4 is a side view, and Fig. 5 shows the cover of Fig. 3. The removed front view, Figure 6 is a vertical sectional view of the main part showing the open circuit state,
Fig. 7 is a vertical sectional view of the main parts showing the closed circuit state, Fig. 8 is an exploded perspective view of the main parts of the components arranged in the front section C, and Fig. 9 is a movable contact plate and the main parts arranged in the rear section D. FIG. 1...Use stand, 2...Cover, A...Body, B-
B...Approximately the center of the breaker, C... Front section, D
... Rear partition, 3 ... Input terminal, 4 ... Fixed contact, 5 ... Power plug, 6 ... Projection piece, 7 ... Main bearing, 8 ... Pivot, 9 ... Handle, 10 ... Handle Window, 11... Operating arm, 12... Pivot, 13
... Pressing plate, 14... Holding plate spring, 15... Inclined pressing surface, 16... Sliding end, 17... Claw piece, 18...
... Claw piece spring, 19 ... Pivot, 20 ... Sliding surface, 2
DESCRIPTION OF SYMBOLS 1... Engagement end, 22... Claw piece support, 23... Locking end, 24... Working arm, 25... Projection shaft, 26...
Claw piece support spring, 29...Extension end, 28...Through hole, 2
9...screw hole, 30...electromagnetic iron piece, 31...free end, 32...iron piece spring, 33...electromagnet frame, 34
...Electromagnet, 35...Magnetic pole, 36...Vertical piece, 3
7A, 37B...Movable contact plate, 38...Movable contact, 39A, 39B...Primary conductor, 40A, 40
B...Mounting screw, 41...Screw, 42...Test switch fixed electrode, 43...Test switch movable electrode, 44...Button window, 45...Test button, 46...Cross bar, 47...Vertical groove , 48
...Stopper, 49...Mounting base, 50...Bulkhead, E...Upper section, F...Lower section, 51A,
51B, 51C...Side wall, 51D...Box, 52
...Width part, 53... Fitting chamber, 54A, 54B...
Vertical rib, 55... Zero-phase current transformer, 56... Thin groove,
57... Connection outlet metal fitting, 59... Outlet socket, 60... Fitting frame, 61... Fixing groove, 62...
...Fixing base, 63...Vertical wall, 64...Vertical base end,
65... Level base end, 66... Pressure contact end, 67... Free end of movable electrode, 68... Test circuit resistance, 69
... Lead wire, 70 ... Zero-phase current transformer secondary output lead wire, 71 ... Width part secondary output lead wire, 72A,
72B... Width control power lead wire, 73... Connection hole, 74... Outlet socket window, 75... Protected equipment, 76... Plug, 77... Existing outlet, 78... Division rib , 79... Opening/closing mechanism section, 80... Tripping mechanism section.

Claims (1)

[Scope of Claims] 1. A power plug, an opening/closing mechanism, and a tripping mechanism including an electromagnet for operating the opening/closing mechanism are disposed in the front compartment of the case, and a zero phase changer is disposed in the rear compartment of the case. In the current leakage and disconnection switch which is formed by arranging a current flow device, a primary conductor, a connection outlet fitting, and an amplification part that amplifies the secondary output of a zero-phase current transformer, the amplification part 52 is installed in the lower stage. Box body 51D to accommodate
A fitting chamber 53 for accommodating the zero-phase current transformer 55 provided approximately in the center of the upper part of the box, and a fitting frame 60 for accommodating the outlet receptacles 59 provided at the front, rear, left and right sides of the fitting chamber.
, a location where a connecting piece of an outlet fitting 57 for connecting the outlet receptacle is arranged, and a narrow groove 56 for accommodating the primary conductors 39A and 39B passing through the zero-phase alternator provided in the upper part of the box from the front to the front. A plug-type earth leakage disconnector characterized by being equipped with a mounting base 49.