JP2012019650A - Power receiving-transforming equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily realize disconnection of a circuit breaker and grounding of a load side even if a housing has a sealed structure.
A circuit breaker 21 for cutting off power supply from a system power supply to a load, a connection / disconnection mechanism 22 for connecting / disconnecting the circuit breaker 21, and a grounding mechanism 23 for grounding a load side when the circuit breaker 21 is disconnected. In the power receiving / transforming equipment accommodated in the housing 24, the circuit breaker 21 is fixedly arranged inside the housing 24, and the connection / disconnection mechanism 22 is slidable so that it can be connected / disconnected to the circuit breaker 21 behind the circuit breaker 21. The grounding mechanism unit 23 is slidably disposed behind the connection / disconnection mechanism unit 22 so as to be groundable to the connection / disconnection mechanism unit 22. The slide shafts 39 and 40 are led out from the front surface of the housing 24 to the outside.
[Selection] Figure 1

Description

  The present invention relates to a power receiving / transforming facility such as a switchgear, which is installed in a building, a factory, or the like and houses various elements such as a circuit breaker, a disconnector, a current transformer, a bus bar, and a conductor in a housing.

  For example, power receiving / transforming equipment installed in buildings, factories, and the like includes a switchgear composed of a housing that houses a circuit breaker (VCB) that cuts off power supply from a system power supply to a load, and other devices. As shown in FIG. 9, this type of switchgear includes a housing 3 having a main part including a circuit breaker 1 that cuts off power supply from a system power supply to a load and a connection / disconnection mechanism 2 that connects and disconnects the circuit breaker 1. The structure housed in

  A system side contact 4 and a load side contact 5 are provided on the back surface of the circuit breaker 1. The circuit breaker 1 is placed on the carriage 6 and is movable in the front-rear direction (the left-right direction in the figure) of the housing 3. On the other hand, in the connection / disconnection mechanism portion 2 arranged behind the circuit breaker 1, a system side conductor 8 and a load side conductor 9 are attached to a support frame 7 that is erected and held at the bottom of the housing 3. The system side conductor 8 is arranged so as to be able to connect and disconnect with the system side contact 4 of the circuit breaker 1, and similarly, the load side conductor 9 is arranged so as to be able to connect and disconnect with the load side contact 5 of the circuit breaker 1. A system bus (not shown) is connected to the system side conductor 8, and a load (not shown) made of various electric facilities is connected to the load side conductor 9.

  FIG. 9 shows a state in which the circuit breaker 1 is connected between the system power supply and the load via the connection / disconnection mechanism unit 2, that is, the system side contact 4 of the circuit breaker 1 and the system side conductor 8 of the connection / disconnection mechanism unit 2. And the load side contactor 5 of the circuit breaker 1 and the load side conductor 9 of the connection / disconnection mechanism portion 2 are electrically connected. Here, when inspecting or exchanging other electrical equipment including the circuit breaker 1, not only the circuit breaker itself is turned off but also the circuit breaker 2 is connected to the circuit breaker in order to reliably shut off the system power supply and the load. 1 needs to be disconnected and disconnected.

  Therefore, as shown in FIG. 9, the circuit breaker 1 is disconnected from the connection / disconnection mechanism 2 by using a crank rod 10 having a bent tip (see, for example, Patent Document 1). That is, by inserting the bent portion of the crank rod 10 into the frame-shaped engaging portion 11 provided on the carriage 6 of the circuit breaker 1, and then rotating the crank rod 10 downward with the tip portion as a fulcrum. The circuit breaker 1 in the “connection position” is pulled out from the front opening of the housing 3 to the “disconnection position” (see FIG. 10). In this way, by moving the circuit breaker 1 together with the carriage 6 from the “connection position” to the “disconnection position”, the system-side contact 4 of the circuit breaker 1 is pulled out from the system-side conductor 8 of the connection / disconnection mechanism section 2, The load-side contact 5 of the circuit breaker 1 is pulled out from the load-side conductor 9 of the connection / disconnection mechanism portion 2. Thereby, the circuit breaker 1 is separated from between the system power supply and the load.

  When inspecting or replacing other electrical equipment including the circuit breaker 1, the load side is generally grounded. The grounding on the load side is performed manually by using the earth hook jig 12. The ground hook jig 12 is provided with a conductive clip 14 at the tip of an insulating rod 13 and a conductive wire 15 extending from the conductive clip 14 is connected to the ground. When grounding the load side using the earth hook jig 12, the operator inserts the conductive clip 14 at the tip of the insulating rod 13 by inserting it from the rear opening of the housing 3 while holding the insulating rod 13. It connects to the load side conductor 9 of the connection / disconnection mechanism part 2. In this way, the load-side conductor 9 of the connection / disconnection mechanism portion 2 is grounded via the conductive clip 14 and the conductive wire 15 of the ground hook jig 12.

  After the inspection or replacement of other electrical equipment including the circuit breaker 1 is completed, the ground hook jig 12 is removed from the load-side conductor 9 of the connection / disconnection mechanism unit 2 and then the crank rod 10 is rotated upward. By moving the circuit breaker 1, the circuit breaker 1 is moved from the “disconnection position” to the “connection position”, and the system side contact 4 of the circuit breaker 1 is inserted into the system side conductor 8 of the connection / disconnection mechanism unit 2. The load side contactor 5 is inserted into the load side conductor 9 of the connection / disconnection mechanism portion 2. Thus, the circuit breaker 1 is connected by electrically connecting the system side and load side contacts 4 and 5 of the circuit breaker 1 to the system side and load side conductors 8 and 9 of the connection / disconnection mechanism portion 2. It is made to return to a state.

JP 2000-341813 A

  By the way, in the conventional switchgear described above, it is necessary to pull out the circuit breaker 1 movably arranged in the front-rear direction with respect to the housing 3 when inspecting or replacing other electrical equipment including the circuit breaker 1. Therefore, the housing 3 has a structure in which the front is opened. In addition, since the earth hook jig 10 needs to be connected to the connection / disconnection mechanism portion 2 from the rear side of the housing 3 at the time of grounding on the load side, the housing 3 has a structure in which the rear side is also opened.

  However, the switch gear described above may be installed outdoors. In that case, foreign matters such as dust and rainwater enter the housing 3, and contact failure and corrosion are likely to occur, and maintenance is troublesome. Therefore, it is desired that the housing 3 has a sealed structure so that foreign matters such as dust and rainwater do not enter. When the housing 3 has a sealed structure, it is difficult to disconnect the circuit breaker 1 from the connection / disconnection mechanism 2 by an external operation when inspecting or replacing other electrical equipment including the circuit breaker 1. It is also difficult to ground the load side with the earth hook jig 10.

  Therefore, the present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to provide a power receiving / transforming facility that can easily realize circuit breaker disconnection and load-side grounding even if the housing has a sealed structure. It is to provide.

  As technical means for achieving the above-described object, the present invention provides a circuit breaker that cuts off the power supply from the system power supply to the load, a connection / disconnection mechanism part that connects / disconnects the circuit breaker, and a load when the circuit breaker is disconnected. In the power receiving / transforming equipment in which the grounding mechanism that grounds the side is housed in the housing, the circuit breaker is fixedly arranged inside the housing, and the connection / disconnection mechanism can be connected to the circuit breaker behind the circuit breaker. The slide mechanism is slidably arranged, and the grounding mechanism portion is slidably arranged behind the connection / disconnection mechanism portion so that it can be grounded to the connection / disconnection mechanism portion. The shaft is led out from the front of the housing.

  In the present invention, by pulling out the slide shaft of the connection / disconnection mechanism part from the front of the housing, the connection / disconnection mechanism part is brought close to the circuit breaker fixedly arranged inside the housing, so that the circuit breaker and the connection / disconnection mechanism part are connected. Connect electrically. In a state where this circuit breaker is connected between the system power supply and the load, by pushing the slide shaft of the grounding mechanism part toward the front side of the housing, the grounding mechanism part is separated from the connection / disconnection mechanism part, and the load side is not connected. Set to ground.

  On the other hand, when inspecting or replacing other electrical equipment including the circuit breaker, the circuit breaker and the connection mechanism part are separated from the circuit breaker by pushing the slide shaft of the connection mechanism part toward the front side of the housing. And is electrically cut off. In the disconnecting state of this circuit breaker, the grounding mechanism portion is brought close to the disconnecting mechanism portion by pulling the slide shaft of the grounding mechanism portion from the front of the housing to electrically connect the disconnecting mechanism portion and the grounding mechanism portion. Connect to and ground the load side. With such a structure, the circuit breaker can be easily disconnected and the load side can be grounded by operating the slide shaft from the outside of the housing, and the housing can be sealed.

  In the present invention, an interlock mechanism that enables the load to be grounded by the grounding mechanism only when the circuit breaker is disconnected by the connection / disconnection mechanism is provided between the slide shaft of the connection / disconnection mechanism and the grounding mechanism and the housing. The structure is desirable. In this way, in order to ground the load side by the grounding mechanism unit only when the circuit breaker is disconnected by the connection / disconnection mechanism unit, the slide shaft of the connection / disconnection mechanism unit and the grounding mechanism unit is operated. Thus, it is possible to prevent the occurrence of erroneous operations and short circuit accidents, thereby improving safety.

  The interlock mechanism in the present invention includes a first lock pin that fits into a hole provided in a slide shaft of the connection / disconnection mechanism when the circuit breaker is disconnected by the connection / disconnection mechanism, and a ground when the load-side is grounded by the grounding mechanism. A structure in which a second lock pin that fits into a hole provided in the slide shaft of the mechanism portion is provided on the housing side is desirable. In this way, when inspecting or replacing other electrical equipment including the circuit breaker, the disconnecting state of the circuit breaker by the connecting / disconnecting mechanism unit by inserting the first lock pin into the hole of the slide shaft of the connecting / disconnecting mechanism unit Can be maintained. At this time, by inserting the second lock pin into the hole of the slide shaft of the grounding mechanism part, the grounding state on the load side by the grounding mechanism part can be maintained. With such a simple structure, erroneous operation of the slide shaft and occurrence of a short-circuit accident can be reliably prevented.

  When the housing according to the present invention is formed of a sealed casing, the slide shaft protrudes and retracts from the front of the sealed casing in a state of being hermetically sealed by a mounting plate fixed to the front of the sealed casing via an O-ring. A structure that is supported freely is desirable. If it does in this way, it becomes easy to ensure the airtightness of a housing with an O-ring while enabling operation of a slide axis from the outside of a housing.

  In the present invention, the pressing member is pushed in a state of being hermetically sealed by the presser plate through the O-ring to the front portion of the sealed casing corresponding to the on / off pushbutton switch provided on the front surface of the circuit breaker. A structure that can be attached to the button switch is desirable. In this way, it becomes easy to secure the airtightness of the housing with the O-ring while enabling the operation of the on / off push button switch of the circuit breaker from the outside of the housing.

  According to the present invention, the circuit breaker is fixedly arranged inside the housing, and the connection / disconnection mechanism portion is slidably disposed behind the circuit breaker so as to be connected / disconnected to the circuit breaker, and the grounding mechanism portion is disconnected. Being slidably arranged so that it can be grounded to the connection / disconnection mechanism part behind the contact mechanism part, and the two slide shafts of the connection / connection mechanism part and the grounding mechanism part are led out from the front of the housing, By operating the slide shaft from the outside of the housing, the breaker can be easily disconnected and the load side can be grounded, and the housing can be sealed. As a result, the power receiving / transforming equipment can be installed even in a bad environment exposed to dust, rainwater, etc., and a highly reliable long-life power receiving / transforming equipment can be provided.

In the embodiment of the present invention, (A) is a cross-sectional view showing a main configuration of a hermetic switchgear, and (B) is a plan view showing an interlock mechanism part and a slide shaft in a connected state of a circuit breaker. (A) is sectional drawing which shows the state after extracting the system side and load side conductor of a connection / disconnection mechanism part from the system side and load side contactor of a circuit breaker, (B) is the interlock in the state of (A) It is a top view which shows a mechanism part and a slide shaft. (A) is sectional drawing which shows the disconnection state of a circuit breaker, (B) is a top view which shows the interlock mechanism part and slide shaft in the state of (A). (A) is sectional drawing which shows the state before inserting the grounding contact of a grounding mechanism part in the grounding conductor of a connection / disconnection mechanism part, (B) is a plane which shows the interlock mechanism part and slide shaft in the state of (A). FIG. (A) is sectional drawing which shows the state after inserting the grounding contactor of a grounding mechanism part in the grounding conductor of a connection / disconnection mechanism part, (B) shows the interlock mechanism part and slide shaft in the state of (A). It is a top view. It is an expanded sectional view of the X section of FIG. It is a left view which shows the housing of the enclosed type switchgear of FIG. It is an expanded sectional view of the Y section of Drawing 1, (A) is a sectional view showing the state where a pressing member was pushed in, and (B) is a sectional view showing the state where the pushing force of a pressing member was canceled. It is sectional drawing which shows the connection state of the circuit breaker with the conventional switchgear. It is sectional drawing which shows the disconnection state of a circuit breaker with the conventional switchgear.

  An embodiment of a power receiving / transforming facility according to the present invention will be described in detail below. In the following embodiment, a switchgear that is installed in a building, a factory, or the like and that houses a circuit breaker (VCB) that cuts off the power supply from the system power supply to the load is illustrated in the housing. It can also be applied to receiving and transforming equipment.

  As shown in FIG. 1A, the switchgear in this embodiment includes a circuit breaker (VCB) 21 that cuts off the power supply from the system power supply to the load, and a connection / disconnection mechanism unit 22 that connects and disconnects the circuit breaker 21. The main portion including the grounding mechanism portion 23 that grounds the load side when the breaker 21 is disconnected is housed in a sealed housing 24.

  The circuit breaker 21 is fixedly arranged inside the housing 24, and a system side contact 25 and a load side contact 26 are provided on the back surface thereof. The housing 24 in which the circuit breaker 21 is housed is constituted by a hermetically sealed housing, but a front opening 27 is provided so that the circuit breaker 21 can be inspected or replaced, and the front opening 27 is hermetically sealed. A cover 28 to be closed is detachably attached (see FIG. 7).

  Moreover, the connection / disconnection mechanism part 22 is arrange | positioned slidably by the trolley | bogie 29 so that it can connect / disconnect with the circuit breaker 21 behind the circuit breaker 21. FIG. In the connection / disconnection mechanism portion 22, a system side conductor 31 and a load side conductor 32 are attached to an insulating support frame 30 that is erected and held on a carriage 29. The system side conductor 31 is arranged so as to be able to connect / disconnect to the system side contact 25 of the circuit breaker 21, and similarly, the load side conductor 32 is arranged so as to be able to connect / disconnect to the load side contact 26 of the circuit breaker 21. A system bus (not shown) is connected to the system side conductor 31 via a flexible conductor 33 so that the connection / disconnection mechanism portion 22 can slide, and the load side conductor 32 has a connection / disconnection mechanism. A load (not shown) made of various electric facilities is connected via a flexible conductor 34 so that the portion 22 can slide.

  Furthermore, the grounding mechanism unit 23 is slidably disposed by a carriage 35 so as to be connected to the connection / disconnection mechanism unit 22 behind the connection / disconnection mechanism unit 22. In the grounding mechanism 23, a grounding contact 37 is provided on an insulating support frame 36 that is held upright on a carriage 35. On the other hand, the load-side conductor 32 of the aforementioned connection / disconnection mechanism 22 is provided with a ground conductor 38 that can be connected / disconnected to the ground contact 37 of the ground mechanism 23. The ground contact 37 provided on the carriage 35 is electrically connected to the ground.

  The connection / disconnection mechanism 22 and the grounding mechanism 23 described above include slide shafts 39 and 40 extending from the front end portions of the carriages 29 and 35 toward the front of the housing 24. The two slide shafts 39 and 40 of the connecting / disconnecting mechanism portion 22 and the grounding mechanism portion 23 are led out to the outside in the horizontal direction from the bottom of the front surface of the housing 24 while being supported by the slide bush 41 (FIG. 7). As shown in FIG. 1B and FIG. 6, each of the slide shafts 39 and 40 is inserted into a hole formed in the bottom of the front surface of the housing 24, and is attached to a mounting plate 44 fixed with bolts 43 via an O-ring 42. Thus, it is supported so as to protrude and retract with respect to the bottom of the front surface of the housing 24 while being hermetically sealed.

  With such a structure, the slide shafts 39 and 40 can be operated from the outside of the housing 24, and the airtightness of the housing 24 is secured by the O-ring 42. Further, since the slide shafts 39 and 40 are led out of the housing 24 with such a structure, the circuit breaker 21 is easily disconnected and the load side is grounded by operating the slide shafts 39 and 40 from the outside of the housing 24. The housing 24 can be sealed.

  In this switchgear, as shown in FIG. 1 (B), an interlock mechanism portion 46 that allows the load side to be grounded by the grounding mechanism portion 23 only when the circuit breaker 21 is disconnected by the connection / disconnection mechanism portion 22 is connected / disconnected. It is provided between the slide shafts 39 and 40 of the mechanism portion 22 and the grounding mechanism portion 23 and the housing 24.

  As shown in FIG. 1B, the interlock mechanism portion 46 extends forward in parallel with the slide shafts 39, 40 from a portion located between the two slide shafts 39, 40 at the bottom of the front surface of the housing 24. A support rod 47 is provided, and a first lock pin 48 and a second lock pin 49 are horizontally arranged at two positions of a base end portion and a tip end portion of the support rod 47 so as to be orthogonal to a direction in which the support rod 47 extends. It is inserted. The first lock pin 48 and the second lock pin 49 are elastically biased toward the slide shaft 40 of the grounding mechanism 23 by springs 50 and 51 stretched between the support rod 47.

  Note that a hole 52 into which the first lock pin 48 can be fitted is formed in the horizontal direction at the distal end portion of the slide shaft 39 of the connection / disconnection mechanism portion 22 so as to be orthogonal to the axis. In addition, a hole 53 into which the first lock pin 48 or the second lock pin 49 can be fitted is formed in the tip of the slide shaft 40 of the grounding mechanism portion 23 so as to be orthogonal to the axis. Furthermore, holes 54 and 55 for inserting a crank rod 61 (described later) are formed in the vertical direction at the most distal end portions of the slide shaft 39 of the connection / disconnection mechanism portion 22 and the slide shaft 40 of the grounding mechanism portion 23. . On the other hand, there are recesses 57 and 58 for inserting the crank rod 61 and rotating it as a fulcrum at two places (“connection position” and “grounding position”) on the base 56 on which the housing 24 is placed. The formed support stands 59 and 60 are installed.

  Further, in this switchgear, since the housing 24 is formed of a hermetically sealed housing, as shown in FIGS. 1 and 8A and 8B, an on / off push provided on the front surface of the circuit breaker 21 is provided. The pressing member 65 is attached to the cover 28 corresponding to the button switch 62 on the front surface of the housing 24 in a state of being hermetically sealed by the pressing plate 63 via the O-ring 64 so that the pressing member 65 can contact the push button switch 62. The structure is provided. The pressing member 65 includes a rod portion 66 that penetrates the cover 28 of the housing 24, a large-diameter portion 67 provided at the housing inner side end portion of the rod portion 66, and a housing outer side end portion of the rod portion 66. A spring 69 is inserted between the presser plate 63 of the O-ring 64 and the flange portion 68.

  As shown in FIG. 8A, by pressing the flange portion 68 of the pressing member 65 against the elastic force of the spring 69, the distal end portion of the pressing member 65 is turned on / off by a push button switch for the circuit breaker 21. The circuit breaker 21 can be turned on and off by making it abut against 62. As shown in FIG. 8B, when the pressing force of the pressing member 65 is released, the large-diameter portion 67 of the pressing member 65 is locked to the inner surface of the cover 28 by the elastic force of the spring 69. Automatically returns to the state. With such a structure, the on / off push button switch 62 of the circuit breaker 21 can be operated from the outside of the housing 24, and the hermeticity of the housing 24 is secured by the O-ring 64.

  FIG. 1 shows a state in which the circuit breaker 21 is connected between the system power supply and the load via the connection / disconnection mechanism 22, that is, the system-side contact 25 of the circuit breaker 21 and the system-side conductor 31 of the connection / disconnection mechanism 22. And the load side contactor 26 of the circuit breaker 21 and the load side conductor 32 of the connection / disconnection mechanism portion 22 are electrically connected. In the connected state of the circuit breaker 21, the system side conductor 31 and the load side conductor 32 of the connection / disconnection mechanism 22 are in the “connection position”. At this time, the ground contact 37 of the ground mechanism 23 is in the “ground release position” and the load side is not grounded.

  In the interlock mechanism portion 46, as shown in FIG. 1B, the slide shaft 39 of the connection / disconnection mechanism portion 22 is in a “connection position” where the hole 52 is aligned with the second lock pin 49. On the other hand, the slide shaft 40 of the ground mechanism 23 is in the “ground release position” where the first lock pin 48 is inserted into the hole 53. The first lock pin 48 holds the state inserted into the hole 53 of the slide shaft 40 by the elastic force of the spring 50. Since the first lock pin 48 can maintain the slide shaft 40 of the grounding mechanism section 23 at the “ground release position”, an erroneous operation of the slide shaft 40 that causes the load side to be grounded in the connected state of the circuit breaker 21 and a short-circuit accident. Occurrence can be prevented and safety can be improved.

  At the time of inspection or replacement of other electrical equipment including the circuit breaker 21, not only the circuit breaker 21 itself is turned off, but also the connection / disconnection mechanism 22 is connected from the circuit breaker 21 in order to reliably disconnect the system power supply and the load. Disconnect and disconnect. The circuit breaker 21 is disconnected and the load side is grounded. The operation of shifting the circuit breaker 21 from the connected state to the disconnected state and shifting the load side from the non-grounded state to the grounded state is as follows. Prior to this operation, by pressing the flange portion 68 of the pressing member 65 on the cover 28 of the housing 24 against the elastic force of the spring 69, the tip end portion of the pressing member 65 is turned on / off of the circuit breaker 21. The circuit breaker 21 is turned off by contacting the push button switch 62 (see FIGS. 8A and 8B).

  After the circuit breaker 21 itself is turned off in this way, the connection / disconnection mechanism 22 is disconnected from the circuit breaker 21 by using the straight crank rod 61. That is, as shown in FIGS. 2A and 2B, the tip of the crank rod 61 is inserted into the hole 54 of the slide shaft 39 of the connection / disconnection mechanism portion 22 to enter the recess 57 of the support base 59 in the “connection position”. Insert (see broken line in FIG. 2A). Then, by rotating the crank rod 61 toward the housing with the tip of the crank rod 61 as a fulcrum (see the solid line in FIG. 2A), the system of the connection / disconnection mechanism portion 22 from the system side contact 25 of the circuit breaker 21 is obtained. The side conductor 31 is pulled out and the load side conductor 32 of the connection / disconnection mechanism 22 is pulled out from the load side contact 26 of the circuit breaker 21.

  After the system side and the load side conductors 31 and 32 of the connection / disconnection mechanism part 22 are pulled out from the system side and the load side contacts 25 and 26 of the circuit breaker 21 in this way, the connection / disconnection mechanism part 22 is placed on the carriage 29. Since it can be easily moved because it is placed, as shown in FIGS. 3 (A) and 3 (B), the connecting / disconnecting mechanism is provided by manually pushing the slide shaft 39 of the connecting / disconnecting mechanism portion 22 toward the housing. The unit 22 is moved from the “connection position” to the “disconnection position”. Thereby, the circuit breaker 21 is separated from between the system power supply and the load. By operating the slide shaft 39 in such a manner, the connection / disconnection mechanism unit 22 is separated from the circuit breaker 21 and disposed at the “disconnection position”, and then the grounding conductor 38 of the connection / disconnection mechanism unit 22 and the ground contactor 37 of the grounding mechanism unit 23. And the load side is grounded. This load side grounding operation is as follows.

  First, as shown in FIGS. 4A and 4B, the first lock pin 48 of the interlock mechanism portion 46 is pushed into the support rod 47 against the elastic force of the spring 50, whereby the grounding mechanism portion 23. The slide shaft 40 is removed from the hole 53 and inserted into the hole 52 of the slide shaft 39 of the connection / disconnection mechanism 22. By releasing the lock of the slide shaft 40, the grounding mechanism portion 23 can be moved. Therefore, the slide shaft 40 in the “ground release position” is pulled out to the front of the housing 24 by hand, and the hole 53 of the slide shaft 40 is formed in the second position. It is arranged in front of the lock pin 49. Here, since the first lock pin 48 inserted into the hole 52 of the slide shaft 39 of the connection / disconnection mechanism portion 22 abuts on the slide shaft 40 of the grounding mechanism portion 23 pulled out, the first lock pin 48 is regulated. The lock pin 48 is inserted into the hole 52 of the slide shaft 39 of the connection / disconnection mechanism portion 22 against the elastic force of the spring 50.

  Then, as shown in FIGS. 5A and 5B, the tip of the crank rod 61 is inserted into the hole 55 of the slide shaft 40 of the grounding mechanism portion 23 so that the concave portion 58 of the support base 60 in the “grounding position”. [Refer to the broken line in FIG. 5A]. Then, by rotating the crank rod 61 to the opposite side of the housing with the tip of the crank rod 61 as a fulcrum (see the solid line in FIG. 5A), the ground conductor 38 of the connection / disconnection mechanism portion 22 is connected to the grounding mechanism portion 23. Insert the ground contact 37. In this way, by moving the grounding mechanism 23 from the “grounding release position” to the “grounding position”, the grounding conductor 38 of the connection / disconnection mechanism 22 and the grounding contact 37 of the grounding mechanism 23 are electrically connected. Connect the load side to ground.

  In the interlock mechanism portion 46, if the second lock pin 49 is pushed into the support rod 47 against the elastic force of the spring 51, when the slide shaft 40 reaches the “grounding position”, FIG. ), The second lock pin 49 is automatically inserted into the hole 53 of the slide shaft 40 by the elastic restoring force of the spring 51. At this time, the first lock pin 48 is inserted into the hole 52 of the slide shaft 39 of the connection / disconnection mechanism portion 22 against the elastic force of the spring 50 by being in contact with the slide shaft 40 of the grounding mechanism portion 23. Since the state is maintained, the slide shaft 39 of the connection / disconnection mechanism portion 22 is locked at the “disconnection position” by the first lock pin 48. As a result, it is possible to prevent erroneous operation of the slide shaft 39 and the occurrence of a short-circuit accident that connect the circuit breaker 21 in the grounded state on the load side, so that safety can be improved.

  After the inspection or replacement of other electrical equipment including the circuit breaker 21 is completed, the grounding mechanism is pushed by pushing the second lock pin 49 of the interlock mechanism 46 into the support rod 47 against the elastic force of the spring 51. The slide shaft 40 of the section 23 is removed from the hole 53. By releasing the lock of the slide shaft 40, the grounding mechanism portion 23 can be moved. Therefore, the tip of the crank rod 61 is inserted into the hole 55 of the slide shaft 40 at the grounding position, and the support base 60 at the “grounding position” is inserted. It inserts in the recessed part 58 (refer the continuous line of FIG. 5 (A)). Then, by rotating the crank rod 61 toward the housing with the tip of the crank rod 61 as a fulcrum (see the broken line in FIG. 5A), the grounding contact of the grounding mechanism portion 23 from the ground conductor 38 of the connection / disconnection mechanism portion 22 is achieved. The child 37 is pulled out (see FIG. 4A).

  After the ground contact 37 of the ground mechanism 23 is pulled out from the ground conductor 38 of the connection / disconnection mechanism 22 in this manner, the ground mechanism 23 is placed on the carriage 35 and can be easily moved. Therefore, by pushing the slide shaft 40 of the ground mechanism 23 into the housing 24 by hand, the ground contact 37 of the ground mechanism 23 is moved from the “ground position” to the “ground release position”. As a result, the load side is not grounded. In the interlock mechanism 46, when the hole 53 of the slide shaft 40 of the ground mechanism 23 reaches the “ground release position”, the first lock pin 48 that has been in contact with the slide shaft 40 causes the elastic restoring force of the spring 50. Thus, it is removed from the hole 52 of the slide shaft 39 of the connecting / disconnecting mechanism portion 22 and automatically inserted into the hole 53 of the slide shaft 40 of the grounding mechanism portion 23 (see FIG. 3B). The grounding mechanism 23 is held at the “grounding release position” by locking the slide shaft 40.

  When the first lock pin 48 is removed from the hole 52 of the slide shaft 39 of the connection / disconnection mechanism portion 22 in this manner, the locked state by the first lock pin 48 is released and the connection / disconnection mechanism portion 22 is Since it becomes movable, the slide shaft 39 in the “disconnection position” is pulled out to the front of the housing 24 by hand. On the other hand, since the first lock pin 48 is inserted into the hole 53 of the slide shaft 40 of the grounding mechanism portion 23 by the elastic force of the spring 50, the slide shaft 40 maintains the locked state [see FIG. 2 (B). ].

  Then, the tip of the crank rod 61 is inserted into the hole 54 of the slide shaft 39 of the connection / disconnection mechanism portion 22 and inserted into the recess 57 of the support base 59 at the “connection position” (see the solid line in FIG. 2A). Then, by rotating the crank rod 61 to the opposite side of the housing with the tip of the crank rod 61 as a fulcrum (see the broken line in FIG. 2A), the connection / disconnection mechanism portion 22 is connected to the system side contactor 25 of the circuit breaker 21. And the load-side conductor 32 of the connection / disconnection mechanism 22 is inserted into the load-side contact 26 of the circuit breaker 21. In this way, the connection / disconnection mechanism unit 22 is moved from the “disconnection position” to the “connection position”, whereby the system side of the circuit breaker 21 and the load side contacts 25 and 26 and the system side of the connection / disconnection mechanism unit 22 and The load side conductors 31 and 32 are electrically connected. Thereby, the circuit breaker 21 is returned to the state connected between the system power supply and the load.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

DESCRIPTION OF SYMBOLS 21 Circuit breaker 22 Connection / disconnection mechanism part 23 Grounding mechanism part 24 Housing 39, 40 Slide shaft 42 O-ring 45 Mounting plate 46 Interlock mechanism part 48 1st lock pin 49 2nd lock pin 62 ON / OFF pushbutton switch 63 Presser plate 64 O-ring 65 Press member

Claims (5)

  Power receiving / transforming equipment in which a circuit breaker that cuts off power supply from a system power supply to a load, a connection / disconnection mechanism part that connects / disconnects the circuit breaker, and a grounding mechanism part that grounds the load side when the circuit breaker is disconnected are housed in a housing The circuit breaker is fixedly disposed inside the housing, and the connection / disconnection mechanism is slidably disposed behind the circuit breaker so as to be connected / disconnected to the circuit breaker, and the grounding mechanism is connected / disconnected. It is slidably arranged so that it can be grounded to the connecting / disconnecting mechanism portion behind the mechanism portion, and the two slide shafts of the connecting / disconnecting mechanism portion and the grounding mechanism portion are led out from the front surface of the housing. Substation equipment.   An interlock mechanism that enables the load side to be grounded by the grounding mechanism only when the circuit breaker is disconnected by the connection / disconnection mechanism is provided between the slide shaft of the connection / disconnection mechanism and the grounding mechanism and the housing. The substation equipment according to claim 1.   The interlock mechanism section includes a first lock pin that fits into a hole provided in a slide shaft of the connection / disconnection mechanism section when the circuit breaker is disconnected by the connection / disconnection mechanism section, and the grounding mechanism when the load mechanism is grounded by the grounding mechanism section. The power receiving / transforming equipment according to claim 2, wherein a second lock pin that fits into a hole provided in the slide shaft of the mechanism portion is provided on the housing side.   The housing is constituted by a hermetically sealed housing, and the slide shaft can be protruded and retracted with respect to the front surface of the hermetically sealed housing while hermetically sealed by a mounting plate fixed to the front surface of the hermetically sealed housing via an O-ring. The power receiving / transforming equipment according to any one of claims 1 to 3, which is supported by the power source.   The push button switch is connected to the front portion of the sealed casing corresponding to the on / off push button switch provided on the front surface of the circuit breaker in a state of being hermetically sealed through a O-ring by a press plate. The power receiving / transforming equipment according to claim 4, wherein the power receiving / transforming equipment is attached so as to be able to come into contact therewith.

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