JP2012150962A - Spd device with circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an SPD device with a circuit breaker which can enhance the suppression effect of a limit voltage for the surge voltage while facilitating the connection and decreasing the installation place, and in which the replacement work of a failed SPD can be carried out easily in safety, and the failed SPD can be disconnected by interrupting the circuit breaker during abnormal operation of the SPD.SOLUTION: The SPD device with a circuit breaker comprises a circuit breaker 1, an SPD unit 28 including a primary terminal consisting of a terminal block which can be connected directly with the circuit breaker 1, and a terminal cover 30 covering the connection of the circuit breaker 1 and the SPD unit 28.

Description

  The present invention relates to an SPD device that protects electrical equipment by absorbing a surge voltage caused by a lightning strike, and more particularly to an SPD device with a circuit breaker used in combination with a circuit breaker.

  When using a general-purpose SPD (Surge Protective Device) device and circuit breaker in combination, separate terminal blocks and terminal covers are required, so separate connection lines are required for connection, and the devices must be separated. Cost. Therefore, installation of these devices required more space and longer wiring length than necessary. As a result, there has also been a problem that the effect of suppressing the limit voltage against the surge voltage, which is the original purpose of the SPD device, cannot be fully exhibited. In particular, such a problem is remarkable in the case of a large surge current such as a direct lightning strike.

  In general, when the circuit breaker and the SPD device are connected, even if the wiring length including the grounding wire is about 30 cm, the primary voltage of the circuit breaker is limited even though the limit voltage of the SPD device itself is 1 kV. In some cases, the limiting voltage between the power supply side (power supply side) and the ground side of the SPD device greatly exceeds 2 kV, and the role of the original protective device cannot be sufficiently exhibited. This is because, in the case of a surge current, a high frequency with a sharp rise and a surge impedance is increased. On the other hand, in the case of an earth leakage breaker, CT and ZCT for detecting overcurrent also have an increased surge impedance, which is counterproductive in terms of the effect of suppressing the limiting voltage.

  In addition, as disclosed in International Publication No. 2008/010495 (Patent Document 1), in the case of a system in which a circuit breaker and an SPD device are integrated, it is more effective in terms of downsizing and suppression of limiting voltage. On the other hand, there is a drawback that the entire apparatus needs to be replaced when the SPD fails. In particular, when the device is installed on the primary side of the main circuit breaker in a situation where power failure work is difficult, a separable method is desired.

  By the way, in the exchange work at the time of SPD failure, the circuit breaker was shut off and its visual confirmation was necessary for safety work. It is also desirable to automatically shut off the circuit breaker when the SPD is abnormal. In this case, it is necessary to electrically or mechanically connect the SPD device and the circuit breaker, but implementation is not easy.

International Publication No. 2008/010495

  The purpose of the present invention is to prevent unnecessary operation due to lightning surge current of the circuit breaker, and to shorten the wiring distance between the SPD device and the circuit breaker to enhance the effect of suppressing the limit voltage against the surge voltage and facilitate connection. In addition, the SPD with a circuit breaker is designed to reduce the installation location and to replace the failed SPD safely and easily, and to shut off the circuit breaker and disconnect the failed SPD during abnormal operation of the SPD. Is to provide a device.

  The present invention comprises a circuit breaker and an SPD device (surge protection device part), and the primary side terminal of the SPD device is a terminal plate that can be directly connected to the circuit breaker, and the circuit breaker and the SPD device. The connection part is covered with a common terminal cover. That is, an SPD device with a circuit breaker according to the present invention includes a circuit breaker, a surge protection device portion (SPD device) including a primary terminal composed of a terminal plate that can be directly connected to the circuit breaker, and a circuit breaker. And a terminal cover that covers a connection portion between the surge protection device portion and the surge protection device portion.

  In addition, the present invention is characterized in that an SPD dedicated mount is provided on the circuit breaker side, and the SPD device is mounted via the SPD dedicated mount. Further, from a different point of view, the SPD device with a circuit breaker according to the present invention may further include an SPD dedicated mounting base that is connected and fixed to the circuit breaker, and the surge protection device portion is an SPD dedicated mounting base. (Claim 2).

  Furthermore, the present invention is characterized in that the circuit breaker is kept open when the terminal cover is removed, and the circuit breaker is opened when the terminal cover is removed. Moreover, if it says from a different viewpoint, this invention may maintain the open state of a circuit breaker in the terminal cover in the non-protection state of a connection part (Claim 3). In the present invention, the circuit breaker may be opened by putting the terminal cover in an unprotected state with respect to the connecting portion (claim 4).

  The present invention is characterized in that the circuit breaker tripping mechanism is directly operated by the operation of the tripping device when the SPD device is abnormal to open the circuit breaker when the SPD is abnormal. From another point of view, in the SPD device with a circuit breaker according to the present invention, the surge protection device part (SPD device) may include a tripping device in case of abnormality, and the circuit breaker is a circuit breaker. A tripping mechanism for opening the circuit may be included. The tripping device at the time of abnormality of the surge protection device part may be able to directly operate the tripping mechanism of the circuit breaker (claim 5).

  Further, the present invention is characterized in that the circuit breaker is opened when the SPD is abnormal by operating the trip coil of the circuit breaker by the contact operation of the trip device when the SPD apparatus is abnormal. From another point of view, in the SPD device with a circuit breaker according to the present invention, the surge protection device unit may include a trip device at the time of an abnormality and a contact that operates at the time of the abnormality. A tripping mechanism for opening the circuit breaker may be included, and the tripping mechanism of the circuit breaker may be operated by a contact output operation in conjunction with a mechanical operation of the trip device in the event of an abnormality (Claims). 6).

  Furthermore, the present invention is characterized in that the primary side terminal of the SPD device is drawn from the side surface of the SPD device so as to be aligned with the load side terminal of the circuit breaker. Also, from a different point of view, in the SPD device with a circuit breaker according to the present invention, the circuit breaker may include a load side terminal, and the primary side terminal of the surge protection device section is a load of the circuit breaker. It may be pulled out from the side surface of the surge protection device portion so as to be arranged in a straight line with the side terminal (claim 7).

  Further, the present invention comprises a circuit breaker and an SPD device, wherein the circuit breaker includes an instantaneous trip element for short-circuit current protection, and a thermal fuse is provided on the SPD device side ( Claim 8).

  Here, when using a conventional independent circuit breaker and SPD (SPD device), each terminal cover is arranged in series, and each terminal screw is connected via a crimp terminal or a connection bar. The wiring length was longer than that. On the other hand, according to the present invention, the SPD side has no terminal screw and can be directly connected, and since there is only one terminal cover, the wiring length is inevitably shortened. As a result, a connection conductor for connection between the circuit breaker and the SPD device is not required. As a result, the wiring length becomes the shortest and the wiring portion impedance becomes small. For this reason, since the voltage drop other than the SPD device with a large surge current is reduced, the effect of suppressing the limiting voltage with respect to the surge voltage, which is the purpose of installing the SPD device, can be expected. Furthermore, since the installation area is reduced and the number of members such as the terminal cover is also reduced, the economical effect (for example, reduction of the manufacturing cost) and the work efficiency can be improved (claim 1).

  According to the present invention, by providing the SPD dedicated mounting base on the circuit breaker side, the effect of facilitating the arrangement, storage, fixing, and connection with respect to the SPD of each phase is obtained.

  According to the present invention, the SPD attachment / detachment operation opens the circuit breaker when the terminal cover is removed, and the circuit breaker cannot be closed when the terminal cover is removed. Therefore, there is a significant effect on safety work from the viewpoint of preventing electric shock (claims 3 and 4).

  According to the present invention, an abnormal SPD device (an SPD device in which an abnormality has occurred) is separated by the opening operation of the circuit breaker and an abnormal state can be easily found, and the circuit breaker and the SPD device are not in contact with each other. Since it is a combination, the SPD device and the circuit breaker may be independent, so that the SPD device can be easily attached and detached (claim 5).

  According to the present invention, the abnormal SPD device is separated by the opening operation of the circuit breaker, and an abnormal state can be easily found. In addition, in this method (method in which the trip coil of the circuit breaker is operated by the contact operation of the trip device at the time of abnormality of the SPD device), the separator when the abnormality occurs in the SPD device is the contact operation of a micro switch or the like. Therefore, a large tripping force is not required (Claim 6).

  According to the present invention, since the impedance and the wiring resistance in the wiring portion can be reduced by forming a linear electric circuit in the connection between the circuit breaker and the SPD device, the effect of suppressing the limiting voltage against the surge voltage, which is the purpose of installing the SPD device. Can be expected (claim 7).

  According to the present invention, the circuit breaker is dedicated to the SPD device, and no current for operating the overcurrent tripping coil or the overcurrent tripping bimetal does not flow when the SPD device fails. Therefore, there are two types of circuit protection functions, one for leakage current and one for short-circuit current. For the leakage current, a thermal fuse may be provided on the SPD device side, and the circuit is cut off for the short-circuit current. It is possible to have a simple configuration that only has an instantaneous trip function in the device. As a result, it is not necessary to provide an overcurrent tripping coil or overcurrent tripping bimetal on the circuit breaker side, eliminating unnecessary operation due to electromagnetic force generated in the overcurrent tripping coil due to lightning surge current and circuit breaking. By reducing the voltage drop due to the shortening of the current path on the device side, the effect of suppressing the limiting voltage can be expected, and the number of parts is reduced, so that the economic effect is great (claim 8).

(A) It is an external appearance perspective view of the SPD device with a circuit breaker according to the embodiment of the present invention. (B) It is the external appearance perspective view which decomposed | disassembled some SPD apparatuses with a circuit breaker by embodiment of this invention. (A) It is an external appearance perspective view of the circuit breaker which comprises the SPD apparatus with a circuit breaker shown in FIG. (B) It is a sectional side view of the circuit breaker shown to Fig.2 (a). (A) It is a disassembled perspective view of the circuit breaker shown in FIG. (B) It is a principal part perspective view which shows the SPD trip button part in the circuit breaker shown to Fig.3 (a). It is a perspective view which shows a SPD unit box part. (A) It is a perspective view which shows a SPD base. (B) It is a disassembled perspective view of a SPD base. (C) It is a disassembled perspective view of SPD base. It is a perspective view which shows the SPD apparatus which comprises the SPD apparatus with a circuit breaker shown in FIG. It is a perspective view which shows a display state when the SPD apparatus of FIG. It is explanatory drawing which shows the connection state of a circuit breaker and an SPD device. It is explanatory drawing which shows the internal structure of a SPD apparatus. It is a disassembled perspective view which shows the state before operation | movement of the SPD isolation | separation mechanism in a SPD apparatus. It is a disassembled perspective view which shows the state after operation | movement of the SPD isolation | separation mechanism in a SPD apparatus. (A) It is the perspective view which looked at the internal structure of the SPD device from the front side before the operation of the SPD separation mechanism. (B) It is the perspective view which looked at the internal structure of the SPD device from the back side before the operation of the SPD separation mechanism. (A) It is the perspective view which looked at the internal structure of the SPD device from the front side after the operation of the SPD separation mechanism. (B) It is the perspective view which looked at the internal structure of the SPD device from the back side after the operation of the SPD separation mechanism. It is a disassembled perspective view which shows the state which removed the shaft positioning member from the SPD apparatus. It is a perspective view of the varistor element which comprises a SPD apparatus. It is explanatory drawing at the time of providing the output contact of the trip coil at the time of abnormality in the trip coil in a circuit breaker, and an SPD device.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  FIG. 1 is an external perspective view of an SPD device with a circuit breaker according to an embodiment of the present invention, and FIG. 2B is a side sectional view of the circuit breaker shown in FIG.

(Description of circuit breaker)
As shown in FIG.1 and FIG.2 (b), the circuit breaker 1 is a tripolar type of R, S, and T. As shown in FIG. The closing jacket of the circuit breaker 1 includes a mold base 2 and a mold cover 3 formed of an insulating material, and the tip of the operation handle 4 is provided so as to protrude from the upper surface of the mold cover 3. One end of the trip lever 5 operatively connected to the operation handle 4 is releasably engaged with an engaging portion 6 a provided on the hook 6. The multi-pole interlocking trip member 7 has an engaging claw (not shown) and is rotatably supported by the fixed frame member. Similarly, an engaging projection piece (not shown) of the hook 6 rotatably supported on the fixed frame member and an engaging claw of the trip member 7 are engaged with each other in a freely releasable manner.

  Further, this circuit breaker 1 does not have a time-delayed trip function, has only a momentary tripping function, and performs a breaking operation in response to only a relatively large overcurrent such as a short-circuit current. Device (short circuit protection circuit breaker). In the present embodiment, an example of only the instantaneous trip function will be described. However, the circuit breaker 1 may be provided with a time delay trip function without being limited thereto.

  The instantaneous tripping electromagnet device 8 includes a fixed iron core 9, a fixed iron core return spring 10, a movable iron piece 11, a movable iron piece return spring 17, and an exciting conductor 15a for biasing the electromagnet. The fixed iron core 9 is formed in a U shape, and is pivotally supported by a support member 13 fixed to the bottom wall of the mold base 2 by a rotation shaft 9b. The fixed core return spring 10 is installed between the front end of the bent portion 9 a of the fixed core 9 and the spring hanging piece 13 a of the support member 13.

  Further, the movable iron piece 11 is pivotally supported by a shaft at a lower end portion thereof on a support portion of the support member, a center portion is provided corresponding to the fixed iron core 9, and an upper end bent portion is provided corresponding to the trip member 7. Yes. The movable iron piece return spring 17 is installed between the tip of the spring hanging piece of the movable iron piece 11 and the support member 13.

  A mounting hole for the main current conductor 15 is provided at the bottom of the mold base 2 of the circuit breaker 1. The main current conductor 15 has an exciting conductor 15a penetrating between the U-shaped fixed iron core 9 and the movable iron piece 11, one end is connected to the movable contact through the flexible conductor, and the other end is a load side terminal. 16b.

  The circuit breaker 1 has a function of tripping the circuit breaker 1 by a mechanical signal from the SPD unit 28 serving as an SPD device (surge protection device unit). That is, the circuit breaker 1 is equipped with an SPD trip lever 18, its return spring, and an SPD trip button 20, as shown in FIG. The SPD trip button 20 is provided so that the tip of the SPD trip button 20 protrudes between the ST phases of the load side terminal 16b. The tip of the SPD trip button 20 is driven by a mechanical signal from an SPD unit 28, which will be described later, that is, when the SPD abnormal projection button 28f pushes the SPD trip button 20 via the trip shaft 23 as shown in FIG. The circuit breaker 1 is in a trip state.

(Description of SPD unit)
While the circuit breaker 1 is a three-phase integrated type, the SPD unit 28 has an independent structure for each phase as shown in FIG. Then, as shown in FIG. 6, the power terminal 28c is directly connected to the load side terminal 16b of the circuit breaker 1 with one terminal screw from the side surface of the closed outer cover of the SPD unit 28 constituted by the mold base 28a and the mold cover 28b. The drawers are arranged as possible. The ground terminal 28d of the SPD unit 28 is drawn from the side surface opposite to the power supply terminal 28c so that the ground wire can be connected directly or indirectly. The SPD abnormality protruding button 28f (see FIG. 7) is provided on the side surface of the SPD unit 28 on the power supply terminal 28c side so as to face the SPD trip button 20 in a non-contact manner.

  Further, the SPD abnormality display panel 28g (see FIG. 7) is arranged on the top surface of the SPD unit 28 so that it can be easily confirmed from the outside. As shown in FIGS. 9 and 10, the power terminal 28c of the SPD unit 28 is internally connected to one terminal of the SPD disconnecting mechanism 28e, and the other terminal of the SPD disconnecting mechanism 28e is an overvoltage suppression element of the SPD unit 28. The ground terminal 28d is connected to one terminal of a varistor element 28h and the other terminal of the varistor element 28h of the SPD unit 28, respectively.

  Further, as shown in FIGS. 9 to 14 and the like, the SPD abnormality protruding button 28f and the SPD abnormality display board 28g are mechanically linked to an internal SPD separation mechanism 28e.

  Here, the SPD separation mechanism 28e will be described with reference to FIGS. 10 and 11 are views in which the mold cover 28b of the SPD unit 28 is removed. FIG. 10 shows a state before the operation of the SPD separation mechanism 28e, and FIG. 11 shows a state after the operation. 12 and 13 are SPD internal configuration diagrams in which the mold base 28a and the mold cover 28b are removed from FIGS. 10 and 11. FIG. FIG. 12 shows a state before the operation of the SPD separation mechanism 28e, and FIG. 13 shows a state after the operation of the SPD separation mechanism 28e.

  The SPD separation mechanism 28e includes a separation spring 28e1, a spring shaft 28e2, a shaft positioning member 28e3, a spring shaft fixing member 28e4, a set screw 28e5, a set screw portion 28e6 also serving as a temperature fuse, a nut 28e7, and a varistor element 28h and a power source. The connection flexible conductor 28e8 between the terminals 28c is configured, and the SPD abnormal protrusion button 28f described above is also a part of the SPD disconnection mechanism 28e. Here, the separating spring 28e1 and the spring shaft 28e2 are arranged on the back surface of the varistor element 28h as shown in FIG. One end of the spring shaft 28e2 is mounted and fixed in a hole of a spring shaft fixing member 28e4 fixed to the varistor element 28h with a screw 28e5, and the other end of the spring shaft 28e2 is fixed by a side wall of the shaft positioning member 28e3 and the mold base 28a. is set up.

  On the other hand, the SPD abnormal projection button 28f is mounted in the same shaft mounting hole so that the spring shaft 28e2 can be moved in the axial direction of the shaft, but is always set screw 28e6 as shown in FIG. The nut 28e7 keeps the position against the separating spring 28e1. Note that the SPD abnormality display plate 28g is movably attached to the mounting base 28m and is not always protruded as shown in FIG. 10 by the display plate spring 28n of FIG. 13, but the SPD separation mechanism 28e. When the SPD is abnormal, the display leaf spring 28n is in the state shown in FIGS.

  Next, a description will be given of an SPD abnormal operation of the SPD separation mechanism 28e having the above configuration. When the varistor element 28h in the applied voltage state deteriorates, the varistor element 28h runs out of heat and the temperature rises rapidly. As a result, the low melting solder of the set screw portion 28e6 which also serves as a temperature fuse is melted. As a result, the SPD abnormal-time protruding button 28f and the connecting flexible conductor 28e8 opened by the separation spring 28e1 are changed from the state of FIG. Move to the state (to the right). At this time, the connecting flexible conductor 28e8 buckles. At that time, the SPD abnormality protruding button 28f interlocked with the SPD disconnecting mechanism 28e also protrudes as shown in FIG. 7, and the circuit breaker 1 is tripped by pressing the SPD trip button 20 on the circuit breaker 1 side.

  When the SPD is normal, the SPD abnormal display board 28g and the SPD abnormal projection button 28f are housed in the closed casing of the SPD unit 28 as shown in FIG. 6, and the display window hole 28i of the SPD abnormal display board 28g Only the tip can be seen from the window hole 28l of the protrusion button 28f when the SPD is abnormal. When the SPD deteriorates, the SPD separation mechanism 28e operates as described above, and the SPD abnormal protrusion button 28f and the SPD abnormal display board 28g protrude as shown in FIG.

(Description of SPD unit box)
As shown in FIG. 4, the SPD unit box 21 is a box to which the SPD unit 28 is attached, and has a mechanical interlock function between the SPD unit 28 and the terminal cover 30 and the circuit breaker 1.

  The electrical connection between the circuit breaker 1 and the SPD unit 28 is realized by connecting the power terminal 28c of the SPD unit 28 to the load side terminal 16b of the circuit breaker 1, respectively. The ground terminal 28d of the SPD unit 28 is short-circuited by the ground bar 32 (see FIG. 1).

  Further, the ground bar 32 is provided with a ground terminal 34 (see FIG. 5) for fastening a ground wire 33 with a crimp terminal.

(Assembly of SPD unit box)
As shown in FIG. 5, the trip shaft 23 is assembled from the bottom, and the trip shaft 23 is rotatably attached by fitting the trip shaft support member 24 from the top, as shown in FIG. .

  Further, the cover interlock lever 25 is fitted and attached to the SPD base 22 from the inside. A trip shaft return spring and a cover interlock lever return spring are mounted on the trip shaft 23 and the cover interlock lever 25, respectively. The grounding bar 32 is fixed with two screws from the bottom.

(Assembly of circuit breaker and SPD unit box)
The protrusion 2a provided at the end of the SPD base 22 is aligned with the groove 2a provided at the load side end of the mold base 2 of the circuit breaker 1 and inserted from the bottom of the circuit breaker 1 (see FIG. 3). To do. By inserting to the final position, the claw 22b (see FIG. 4) of the SPD base 22 is engaged with the engaging portion 2b provided at the load side end of the mold base 2, and the circuit breaker 1 and the SPD base 22 are combined. The

(SPD unit installation and installation)
After the circuit breaker 1 and the SPD base 22 are assembled together, the SPD units 28 of the respective phases are assembled into the SPD base 22 and the screws of the power supply terminal 28c and the ground terminal 28d are tightened to complete the SPD device with a circuit breaker. . In addition, the terminal cover 30 is arrange | positioned so that the connection part in which the power supply terminal 28c is located may be covered. The SPD device with a circuit breaker is usually installed on a switchboard or the like in this finished product state.

Next, the operation of the SPD device with a circuit breaker of the present invention configured as described above will be described.
(Interlock operation with SPD unit)
When the SPD unit 28 deteriorates, the SPD abnormality protruding button 28f protrudes in the direction of the arrow in FIG. 4 and rotates the trip shaft 23 in the direction of the arrow. When the trip shaft 23 rotates, the SPD trip button 20 (see FIG. 3) on the circuit breaker 1 side facing the trip shaft 23 is pushed, and the other end of the SPD trip button 20 is connected to the SPD trip lever 18 (see FIG. 3). ) To press the trip member 7 (see FIG. 2). As a result, the trip member 7 rotates counterclockwise and the engagement claw of the trip member 7 engages with the engagement protrusion of the hook 6 and the engagement portion 6 a of the hook 6 engages with the trip lever 5. Are opened sequentially, and the opening and closing mechanism is destroyed. As a result, the circuit breaker 1 is opened and is in a trip state. When the SPD abnormal protrusion button 28f protrudes, the operation handle 4 of the circuit breaker 1 is in the trip position, and the main circuit is in the open state. Even if the circuit breaker 1 is reset by operating the operating handle 4 from this state, it cannot be reset. Even if the operating handle 4 is turned to the ON position, the main contact remains open, and the operating handle 4 is also released, the trip position. Return to.

(Interlock operation with terminal cover)
The terminal cover 30 also has an interlock function in the same manner as the SPD abnormal protrusion button 28f.

  FIG. 1 shows a normal use state in which the terminal cover 30 is mounted. At this time, the cover interlock lever 25 (see FIG. 5) is pushed by the terminal cover 30 and pushed. When the terminal cover 30 is removed in this state, the cover interlock lever 25 is rotated in the direction of the arrow in FIG. 5A by the action of the cover interlock lever return spring, and the trip shaft 23 engaged therewith is shown in FIG. Rotate in the direction of the arrow. As a result, the circuit breaker 1 can be tripped. However, the terminal cover 30 is normally removed when the SPD unit 28 is deteriorated and replaced. In this case, since the circuit breaker 1 is originally tripped as described above, the replacement of the SPD unit 28 is safe. Can be implemented. Further, in a state where the terminal cover 30 is not attached, the trip state of the circuit breaker 1 is maintained. The terminal cover 30 can be sealed with a sealing pin 31 (see FIG. 1) after being mounted.

(Grounding terminal cover)
The ground terminal 34 is a safe part at the ground potential, but a ground terminal cover 35 (see FIG. 1) is attached in order to prevent inadvertent contact because the metal part is exposed. In the SPD device with a circuit breaker shown in FIG. 1, the ground terminal cover 35 does not have an interlock function.

(Replacement of SPD unit)
When the SPD unit 28 deteriorates and generates heat, the SPD separation mechanism 28e operates, and the SPD abnormal protrusion button 28f protrudes to automatically trip the circuit breaker 1. In this case, the deteriorated SPD unit 28 needs to be replaced. However, the deteriorated SPD unit 28 is replaced in the following order. The SPD unit 28 can be replaced with the SPD device with a circuit breaker installed.

(1) Confirm that the circuit breaker 1 is in a trip state.
(2) The sealing pin 31 is removed and the terminal cover 30 is removed.

(3) Remove the ground terminal cover 35.
(4) The screws of the power terminal 28c and the ground terminal 28d of the SPD unit 28 are removed, and the deteriorated SPD unit 28 is removed.

(5) A new SPD unit 28 is installed in the reverse order.
(When the circuit breaker is operated by the output contact of the trip device when the SPD device is abnormal)
In the above-described embodiment, the tripping mechanism of the circuit breaker 1 is directly operated by the operation of the tripping device (SPD separating mechanism 28e) at the time of abnormality of the SPD device (SPD unit 28), and the circuit breaker 1 at the time of SPD abnormality. However, a different configuration may be adopted. For example, the circuit breaker 1 can be opened when the SPD is abnormal by operating, for example, a voltage tripping device built in the circuit breaker 1 by a contact operation of, for example, a micro switch of the tripping device at the time of abnormality of the SPD device. Good.

  That is, as shown in FIG. 16, a tripping coil 36 is provided on the circuit breaker 1 side, and an a contact output unit 28j and an a contact signal output terminal 28k that are linked to the operation of the SPD disconnecting mechanism 28e are provided on the SPD unit 28 side. The a contact signal output terminal 28k is electrically coupled to the a contact signal input terminal 37 provided on the circuit breaker 1 side. Here, when the SPD separation mechanism 28e operates, the a-contact output unit 28j is closed. As a result, the tripping coil 36 on the circuit breaker 1 side is applied with a voltage between two phases of the power supply side terminal 16a on the circuit breaker 1 side, for example, between the R and S phases. To do.

  Here, if the characteristic configuration of the SPD device with a circuit breaker shown in FIG. 1 and the like is listed, the SPD device with a circuit breaker can be directly connected to the circuit breaker 1 and the circuit breaker 1. A surge protection device portion (SPD unit 28, which is an SPD device) including a primary side terminal made of a terminal plate (power supply terminal 28c), and a terminal cover 30 covering a connection portion between the circuit breaker 1 and the SPD unit 28 are provided.

  In this way, a connection conductor for connection between the circuit breaker 1 and the SPD unit 28 is not required, and as a result, the wiring section impedance is reduced. For this reason, since the voltage drop other than the SPD unit 28 with a large surge current is reduced, an effect of suppressing the limiting voltage with respect to the surge voltage, which is the installation purpose of the SPD device, can be expected. Furthermore, since the installation area can be reduced and the number of members such as the terminal cover 30 can be minimized, manufacturing costs can be reduced and work efficiency can be improved.

  The SPD device with a circuit breaker may further include an SPD dedicated mounting base (SPD base 22) connected and fixed to the circuit breaker 1, and the SPD unit 28 is mounted on the SPD dedicated mounting base. Also good. In this case, when the SPD base 22 is connected to the circuit breaker 1 side, it is possible to easily arrange, store, fix, and connect the SPD unit 28 for each phase.

  In the SPD device with a circuit breaker, the circuit breaker 1 is opened when the terminal cover 30 is removed, and the circuit breaker 1 is kept open when the terminal cover 30 is removed. That is, the terminal cover 30 maintains the open state of the circuit breaker 1 when the connection portion is not protected. Moreover, the circuit breaker 1 is opened by putting the terminal cover 30 in an unprotected state with respect to the connection portion. For this reason, there is no work on the live line, and therefore, there is a great effect on safety work from the viewpoint of preventing electric shock.

  The SPD device with a circuit breaker may include a trip unit (SPD separating mechanism 28e) when the SPD unit 28 is abnormal, and the circuit breaker 1 has a tripping mechanism for opening the circuit breaker 1. May be included. The tripping device (SPD separating mechanism 28e) at the time of abnormality of the SPD unit 28 can directly operate the tripping mechanism of the circuit breaker 1. In this case, the SPD unit 28 in which an abnormality has occurred due to the opening operation of the circuit breaker 1 is separated, and an abnormal state can be easily found. Further, since the circuit breaker 1 and the SPD unit 28 are non-contact coupled, the SPD unit 28 and the circuit breaker 1 may be independent, and therefore the SPD unit 28 can be easily attached and detached.

  Further, the SPD device with a circuit breaker may include a contact (a contact output part 28j) that operates when the SPD unit 28 is abnormal, and the tripping mechanism of the circuit breaker 1 is a trip device when abnormal. It operates by the operation of the a-contact output unit 28j in conjunction with the mechanical operation of the (SPD separation mechanism 28e). In this case, the abnormal SPD unit 28 is separated by the opening operation of the circuit breaker 1, and an abnormal state can be easily found.

  In the SPD device with a circuit breaker, the circuit breaker 1 may include a load side terminal 16b, and the power supply terminal 28c, which is a primary side terminal of the SPD unit 28, is connected to the load side terminal 16b of the circuit breaker 1. Are drawn from the side surface of the SPD unit 28 so as to be arranged in a straight line. In this case, in the connection between the circuit breaker 1 and the SPD unit 28, the impedance and the wiring resistance in the wiring portion can be reduced by forming a linear electric circuit.

  In the SPD device with a circuit breaker, the circuit breaker 1 may include an instantaneous trip element for short-circuit current protection, and a thermal fuse on the SPD unit 28 side. Thus, it is possible to provide a simple configuration in which a thermal fuse is provided on the SPD unit 28 side for the leakage current and the circuit breaker 1 is provided with an instantaneous trip function for the short-circuit current.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

  The present invention is particularly advantageously applied to an SPD device with a circuit breaker in which a circuit breaker and an SPD device are used in combination.

  DESCRIPTION OF SYMBOLS 1 Circuit breaker, 2 Mold base, 2a Groove, 2b Engagement part, 3 Mold cover, 4 Operation handle, 5 Trip lever, 6 Hook, 6a Engagement part, 7 Trip member, 8 Electromagnetic device for instantaneous trip, 9 Fixed iron core, 9a bent portion, 9b rotating shaft, 10 fixed iron core return spring, 11 movable iron piece, 13 support member, 13a spring bridge piece, 15 main current conductor, 15a exciting conductor, 16a power supply side terminal, 16b load side terminal, 17 Movable iron return spring, 18 SPD trip lever, 20 SPD trip button, 21 SPD unit box, 22 SPD base, 22a Convex, 22b Claw, 23 Trip shaft, 24 Trip shaft support member, 25 Cover interlock lever, 28 SPD Unit, 28a Mold base, 28b Yield cover, 28c Power terminal, 28d, 34 Ground terminal, 28e SPD disconnect mechanism, 28e1 Disconnect spring, 28e2 Spring shaft, 28e3 Shaft positioning member, 28e4 Spring shaft fixing member, 28e5 Set screw, 28e6 Set screw part, 28e7 Nut, 28f SPD Protruding button at abnormal time, 28g SPD abnormal indication board, 28h Varistor element, 28i Display window hole, 28ja Contact output part, 28ka contact signal output terminal, 28l Window hole, 28m Mounting base, 28n Display leaf spring, 30 Terminal cover , 31 Seal pin, 32 Ground bar, 33 Ground wire, 35 Ground terminal cover, 36 Trip coil (voltage trip device), 37 a Contact signal input terminal.

Claims (8)

A circuit breaker;
A surge protection device including a primary side terminal composed of a terminal plate that can be directly connected to the circuit breaker;
An SPD device with a circuit breaker, comprising: a terminal cover that covers a connection portion between the circuit breaker and the surge protection device portion. It further comprises an SPD dedicated mounting base connected and fixed to the circuit breaker,
The SPD device with a circuit breaker according to claim 1, wherein the surge protection device unit is attached to the SPD mounting base.   2. The SPD device with a circuit breaker according to claim 1, wherein the terminal cover maintains an open state of the circuit breaker when the connection portion is not protected. 3.   4. The SPD device with a circuit breaker according to claim 3, wherein the circuit breaker is opened by placing the terminal cover in an unprotected state with respect to the connection portion. 5. The surge protection device unit includes a tripping device in case of abnormality,
The circuit breaker includes a tripping mechanism that opens the circuit breaker,
The SPD device with a circuit breaker according to claim 1 or 2, wherein the tripping device at the time of abnormality of the surge protection device part can directly operate the tripping mechanism of the circuit breaker. The surge protection device unit includes a trip device at the time of abnormality and a contact that operates at the time of abnormality,
The circuit breaker includes a tripping mechanism that opens the circuit breaker,
3. The SPD device with a circuit breaker according to claim 1, wherein the tripping mechanism of the circuit breaker operates by a contact output operation linked to the mechanical operation of the tripping device at the time of abnormality. The circuit breaker includes a load side terminal,
The primary terminal of the surge protection device unit is drawn from a side surface of the surge protection device unit so as to be arranged in line with the load side terminal of the circuit breaker. SPD device with circuit breaker. The circuit breaker includes an instantaneous trip element for short circuit current protection;
The SPD device with a circuit breaker according to any one of claims 1 to 7, wherein the surge protection device section includes a thermal fuse.