JP2007306764A - Circuit breaker feeding system for switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker feeding system which eliminates possible danger on an operator for maintenance service when feeding a circuit breaker from the case of a switchgear at maintenance service of switchgear. <P>SOLUTION: The circuit breaker feeding system of a switch gear comprises a circuit breaker of main circuit provided in the case of the switchgear, a door fitted to the case that houses the circuit breaker, and a circuit breaker position sensor which detects moving position of the circuit breaker in the case of the switch gear. A first insert opening through which an operation handle is inserted for feeding the circuit breaker is formed on the door. A second insert opening for moving the circuit breaker by operating the operation handle engaged with that inserted operation handle is formed on the circuit breaker. A first solenoid device is provided for locking/unlocking the door. A control unit is provided which locks the door by issuing an instruction signal to the first solenoid device, based on the detection signal from the position sensor of the circuit breaker. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a switchgear constituting a substation facility used in a power plant, a substation, a building, a factory, and the like, and more particularly, to a switchgear breaker insertion / removal system for moving and removing a circuit breaker during maintenance of the switchgear. Is.

  The switch gear is configured to include each circuit breaker (CB), disconnector (DS), and grounding device (ES). These circuit breakers, disconnectors and grounding devices constituting the switchgear must be regularly inspected and maintained.

  When maintenance and inspection of each device of the switchgear is performed, the circuit breaker is moved from the casing of the switchgear to ensure safety and the connection of the bushing and the conductor is released. The operation will be performed.

  Since the operation to pull in and out the circuit breaker from the switchgear housing requires an operation to pull out the circuit breaker from the normal operation position to the disconnection position and an operation to return the circuit breaker from the disconnection position to the operation position again. The circuit breaker is manually inserted and removed with the front door attached to the switchgear housing open.

  Japanese Patent Application Laid-Open No. 7-254343 is not a device for operating the circuit breaker in and out of the housing, but includes an external operation handle that operates the circuit breaker from the outside of the housing and also serves as a lock for the door of the housing. A technique for improving safety by disclosing the above is disclosed.

JP 7-254343 A

  By the way, when a circuit breaker is put in and out of the switchgear housing for the switchgear maintenance check, if a three-phase short circuit occurs due to some trouble, the maintenance check is performed by arc discharge generated at the time of the short circuit. Remain at risk.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a switchgear circuit breaker insertion / removal system that eliminates the possibility of danger to workers performing maintenance / inspection when the circuit breaker is inserted / removed from / to the switchgear casing during maintenance / inspection of the switchgear. Is to provide.

  The switchgear circuit breaker insertion / removal system according to the present invention includes a main circuit breaker provided in a switchgear housing, a door attached to the housing accommodating the circuit breaker, and a switchgear housing. A circuit breaker position sensor for detecting a moving position of the circuit breaker, forming a first insertion port for inserting an operation handle for inserting and removing the circuit breaker into and out of the door, and engaging with the inserted operation handle Then, a second insertion port for moving the circuit breaker by operating the operation handle is formed in the circuit breaker, a first solenoid device for operating the door locking is provided, and a detection signal from the position sensor of the circuit breaker is provided. Based on the above, a controller is provided that gives a command signal to the first solenoid device to lock the door.

  The switchgear circuit breaker loading / unloading system of the present invention includes a main circuit breaker provided in a switchgear housing, a door attached to the housing housing the circuit breaker, and an open / closed state of the door. A door opening / closing sensor for detecting the operation of the door, forming a first insertion port for inserting an operation handle for inserting / removing the circuit breaker into / from the door, and engaging the inserted operation handle to operate the operation handle The second insertion port for moving the circuit breaker is formed in the circuit breaker, a second solenoid device for locking the second insertion port of the circuit breaker is provided, and the second insertion device is provided based on the detection signal from the door opening / closing sensor. It is characterized by comprising a controller for giving a command signal to the second solenoid device and locking the second insertion port of the circuit breaker.

  According to the present invention, since the circuit breaker can be moved with the door of the switchgear housing closed, when the circuit breaker is put in and out of the switchgear housing during the switchgear maintenance and inspection. In addition, it is possible to realize a switchgear circuit breaker insertion / removal system that eliminates the possibility of danger to workers performing maintenance and inspection.

  An embodiment of a switchgear circuit breaker loading / unloading system that enables the circuit breaker to be loaded and unloaded from the switchgear housing with the front door closed will be described below with reference to the drawings.

  1 to 7 show a switchgear circuit breaker insertion / removal system that is one embodiment of the present invention that enables the circuit breaker to be taken in and out from the switchgear with the front door closed.

  FIG. 1 is a cross-sectional view of a switchgear when a metal-closed switchgear 100 is viewed from the side, and FIG. 2 is a side view of the circuit breaker showing the circuit breaker 2 accommodated in the switchgear 100.

  1 and 2, the metal closed switchgear 100 is composed of a plurality of compartments partitioned by a metal plate 1a.

  Each of these compartments includes a main circuit compartment 1 serving as a location for connecting an electrical load such as an external transformer or an electric motor, and a switchgear arranged adjacent to the main circuit compartment 1 and adjacent to the bus line. It is composed of a connected bus compartment 2, a circuit breaker compartment 3 in which a circuit breaker 7 is housed and positioned in the lower stage, and a control component 4 in which a control circuit is housed and located in the lower stage.

  A front door 5 is attached to the front side of the metal plate 1a partitioning the casing of the metal closed switchgear 100 so as to be openable and closable with respect to the metal plate 1a. A front door handle 6 is provided.

  The main circuit of electricity disposed in the main circuit compartment 1 is connected to the circuit breaker 7 disposed in the adjacent circuit breaker compartment 3 through the bushing 10 by drawing the conductor 9 from the outside through the inlet 8. .

  The circuit breaker 7 arranged in the circuit breaker compartment 3 is electrically connected from the bushing 10 provided in the main circuit compartment 1 to the bus 12 of the bus compartment 2 via the conductor 11 and is arranged adjacently through the bus 12. It arrange | positions so that it may connect with the metal closed type switchgear 100. FIG.

  Since the metal closed switchgear 100 is generally used in three-phase alternating current, the main circuit composed of the conductor 9, the bushing 10, and the conductor 11 is arranged side by side in the depth direction perpendicular to the paper surface of FIG. Often. In many cases, auxiliary equipment such as an instrument current transformer 13 for measuring a current value is installed in the main circuit.

  The circuit breaker 7 has wheels 28 attached to the lower part thereof. The circuit breaker 7 has an operation position 35, an intermediate position 37 between the operation position 35 and the disconnection position 36 indicated by a broken line, and the front door 5 also indicated by a broken line. The circuit breaker 7 is configured to move to the adjacent disconnection position 36 by traveling on the rail 14.

  A front door handle insertion port 16 is opened in the front door 5 provided on the front side of the metal plate 1a that divides the appearance of the metal closed type switchgear 100, so that the breaker 7 can be removed when the circuit breaker 7 is moved. The container handle 15 is inserted through the front door handle insertion port 16 and the other end of the circuit breaker handle 15 is engaged with a bolt and nut mechanism (not shown) attached to the circuit breaker 7.

  The circuit breaker 7 can be moved to any position between the operating position 35, the intermediate position 37 between the operating position 35 and the disconnecting position 36, and the disconnecting position 36 by rotating the circuit breaker handle 15. The circuit breaker 7 travels on the rail 14 and is configured to operate the circuit breaker 7 installed inside the circuit breaker compartment 3.

  A door position detection switch 17 for detecting opening / closing of the front door 5 is provided in the vicinity of the front door 5 of the metal plate 1a that partitions the casing of the metal closed switchgear 100, and detects the open / closed state of the front door 5. Then, the detection signal is output to the controller 200.

  Further, in the vicinity of the front door 5 of the metal plate 1a of the casing, the front door is operated based on a command signal from the controller 200, and the front door 5 is closed and the front door 5 is locked to the metal plate 1a. A locking solenoid lock 18 is provided.

  FIG. 2 shows a side view of the circuit breaker 7. The circuit breaker 7 shown in FIG. 2 is provided with a connection portion 21 to the main circuit, and a conductor 22 and a current cutoff valve 23 connected to the connection portion 21 are provided to form an electric circuit.

  Then, by moving the circuit breaker 7 during the maintenance of the metal closed switchgear 100, the connection between the bushing 10 of the main circuit compartment 1 and the connection portion 21 of the circuit breaker 7 is released, and the occurrence of a three-phase short circuit is obviated. It is configured to be prevented.

  The circuit breaker 7 is provided with an operation mechanism portion 24 for opening and closing the current interruption valve 23 and a transmission portion 25 for transmitting the operation power of the operation mechanism portion 24 to the valve 23.

  A circuit breaker moving wheel 28 is provided below the circuit breaker 7, and the circuit breaker 7 travels on the rail 14 when the circuit breaker 7 moves in the circuit breaker compartment 3.

  A circuit breaker position detection switch 29 is provided on the side surface of the circuit breaker 7. When the circuit breaker 7 is moved, the circuit breaker position detection switch 29 is attached to a plurality of positions on the side surface of the metal plate that partitions the circuit breaker compartment 3. By contacting the plate member, it is detected whether the breaker 7 is at the operation position 35, the intermediate position 37 between the operation position 35 and the disconnection position 36, or the disconnection position 36, respectively. The detection signal is output to the controller 200.

  The switchgear circuit breaker taking-in / out system of the present embodiment is provided with a controller 200, an opening / closing signal of the front door 5 detected by the door position detection switch 17, and a circuit breaker 7 detected by the circuit breaker position detection switch 29. Each position signal indicating the movement position is input.

  3 and 4 are views showing a lower stage in which the circuit breaker 7 is housed in the front view of the metal closed switchgear 100 shown in FIG. 1, and FIG. 3 shows a state in which the front door 5 is closed. 4 shows the state in which the front door 5 is opened.

  A circuit breaker handle insertion port 31 is formed in the circuit breaker 7 facing the front door 5. When the front door 5 is closed, the front door handle insertion port 16 formed in the front door 5 and the circuit breaker handle insertion port are formed. A screw mechanism (not shown) is provided in the circuit breaker 7 through the front door handle insertion port 16 of the front door 5 when the circuit breaker 7 is moved and operated so that the positions of 31 are overlapped. And the circuit breaker 7 can be moved by rotating the loading / unloading handle 15.

  A handle insertion port locking solenoid lock 30 having a lock pin 32 is provided on the front surface of the circuit breaker 7 facing the front door 5, and the handle insertion port locking solenoid lock is based on a command signal from the controller 200. By energizing 30, the lock pin 32 protrudes and the circuit breaker handle insertion port 31 is closed, so that the tip of the loading / unloading handle 15 cannot be inserted into the circuit breaker handle insertion port 31.

  A command signal for exciting the handle insertion port locking solenoid lock 30 is transmitted from the controller 200 to the handle insertion port locking solenoid lock 30 via the secondary plug 27.

  A door position detection switch 17 for detecting the open / closed state of the front door 5 is provided in the vicinity of the front door 5 inside the metal plate 1a constituting the casing of the metal closed switchgear 100. The door position detection switch 17 To detect the open / closed state of the front door 5 and output the detection signal to the controller 200.

  The controller 200 inserts a handle attached to the circuit breaker 7 when the front door 5 detects a door open signal based on the door open / close signal of the front door 5 detected by the door position detection switch 17. A command signal for exciting the mouth locking solenoid lock 30 is output via the secondary plug 27.

  Since the secondary plug 27 is connected to the operation mechanism unit 24 of the circuit breaker 7, a command signal from the controller 200 is input to the handle insertion port locking solenoid lock 30 via the secondary plug 27 and excited. .

  By this excitation, the lock pin 32 provided on the handle insertion port locking solenoid lock 30 is protruded, and the lock pin 32 closes the circuit breaker handle insertion port 31 formed in the circuit breaker 7.

  As a result, the tip of the insertion / extraction handle 15 cannot be inserted into the circuit breaker handle insertion port 31 of the circuit breaker 7, so that the circuit breaker 7 cannot be moved.

  That is, in the controller 200, based on the opening / closing signal of the front door 5 detected and input by the door position detection switch 17, a command for exciting the handle insertion port locking solenoid lock 30 when the front door 5 is opened. A signal is output from the controller 200 and the circuit breaker handle insertion port 31 of the circuit breaker 7 is locked by projecting the lock pin 32 of the solenoid lock 30 for locking the handle insertion port.

  On the other hand, based on the opening / closing signal of the front door 5 input from the door position detection switch 17, when the front door 5 is closed, an excitation command is issued from the controller 200 to the handle insertion port locking solenoid lock 30. Since no signal is output, the lock pin 32 does not operate, and the tip of the circuit breaker handle 15 can be inserted into the circuit breaker handle insertion port 31 of the circuit breaker 7.

  That is, the controller 200 constitutes an interlock that excites the solenoid lock 30 for locking the handle insertion opening when the front door 5 is open based on the detection signal from the door position detection switch 17 so that the circuit breaker handle insertion opening 31 is opened. It is to be locked.

  As a result, the tip of the access handle 15 is inserted into the circuit breaker handle insertion port 31 of the circuit breaker 7 through the front door handle insertion port 16 of the front door 5 and engaged with a screw mechanism (not shown) provided in the circuit breaker 7. The circuit breaker 7 can travel on the rail 14 and move by the turning operation of the loading / unloading handle 15.

  Furthermore, in the switchgear circuit breaker taking-in / out system of this embodiment, as shown in FIGS. 3 to 6, the circuit breaker position detection switch 29 attached to the side surface of the circuit breaker 7 is formed of a metal plate that partitions the circuit breaker compartment 3. The moving position of the circuit breaker 7 is detected and input to the control device 200 by coming into contact with the plate members 29b provided at a plurality of positions on the side surface.

  That is, when the circuit breaker 7 is moved, the front door 5 is closed, and the handle 15 is inserted into the circuit breaker handle insertion port 31 of the circuit breaker 7 through the front door handle insertion port 16 of the front door 5. Then, the circuit breaker 7 is moved by turning the loading / unloading handle 15.

  Then, as the circuit breaker 7 travels on the rail 14 and moves, the circuit breaker position detection switch 29 provided on the circuit breaker 7 comes into contact with the plate members 29b installed at the respective positions, thereby breaking the circuit breaker. A detection signal at position 7 is issued.

  As a result, the position of the circuit breaker 7 in the circuit breaker compartment 3 by the circuit breaker position detection switch 29 is in the operating position 35, the intermediate position 37 between the operating position 35 and the disconnecting position 36, or the disconnecting position 36. Each of the detected signals is input to the controller 200.

  When a command signal is issued from the controller 200 based on the position signal of the circuit breaker 7 and the position of the circuit breaker 7 is at an intermediate position 37 between the operation position 35 and the disconnection position 36, the front door is locked. A command signal for energizing the solenoid lock 18 is output, the front door locking solenoid lock 18 is excited, the lock pin 33 of the front door locking solenoid lock 18 is protruded, and the front door 5 is connected to the housing of the switchgear 100. The front door 5 is locked by being fixed to the metal plate 1a.

  In other words, the controller 200 excites the front door locking solenoid lock 18 when the position of the circuit breaker 7 is at an intermediate position 37 between the operation position 35 and the disconnection position 11 based on the detection signal from the circuit breaker position detection switch 29. The front door 5 is locked by constituting an interlock.

  When the position of the circuit breaker 7 in the circuit breaker compartment 3 detected by the circuit breaker position detection switch 29 is in the operation position 35 and the disconnection position 36, the controller 200 controls the front door locking solenoid lock 18. Since the excitation command signal is not output, the lock pin 33 does not operate and the front door 5 is unlocked. Therefore, the front door 5 is opened and an operator enters the breaker compartment 3 and the operation position 35 is reached. Or it becomes possible to check the circuit breaker 7 in the disconnection position 36.

  FIG. 7 shows the relationship between the position of the circuit breaker 7 in the circuit breaker compartment 3 and the locked state of the front door 5, and the detection of the door position detection switch 17 for detecting the opening and closing of the front door and the locked state of the circuit breaker handle insertion port 31. It is the condition figure of the interlock of the controller which showed each.

  In FIG. 7, as described above, the position of the circuit breaker 7 in the circuit breaker compartment 3 is at the operation position 35 by the circuit breaker position detection switch 29 or at an intermediate position 37 between the operation position 35 and the disconnection position 36. Or the disconnection position 36 is detected.

  A command signal is issued from the controller 200 based on the position signal of the circuit breaker 7 detected by the circuit breaker position detection switch 29, and the position of the circuit breaker 7 is set at an intermediate position 37 between the operation position 35 and the disconnection position 36. In some cases, a command signal for energizing the front door locking solenoid lock 18 is output to excite the front door locking solenoid lock 18 to cause the lock pin 33 to project and lock the front door 5.

  When the position signal of the circuit breaker 7 detected by the circuit breaker position detection switch 29 is in the operation position 35 and the disconnection position 36, the controller 200 does not output an excitation command signal to the solenoid lock 18 for locking the front door. Therefore, the front door 5 is unlocked.

  Further, the open / closed state of the front door 5 is detected by the door position detection switch 17, and the controller 200 when the front door 5 is opened based on the open / close signal of the front door 5 detected by the door position detection switch 17. A command signal for energizing the solenoid lock 30 for locking the handle insertion opening is output, and the lock pin 32 is projected to lock the circuit breaker handle insertion opening 31 of the circuit breaker 7.

  When the opening / closing signal of the front door 5 detected by the door position detection switch 17 is closed, the controller 200 does not output an excitation command signal to the handle insertion port locking solenoid lock 30, so the lock pin 32 is operated. Since the circuit breaker handle insertion port 31 of the circuit breaker 7 is unlocked, the tip of the circuit breaker handle 15 can be inserted into the circuit breaker handle insertion port 31.

  As can be understood from the switchgear circuit breaker taking-in / out system of the embodiment described with reference to FIGS. 1 to 7, only when the front door of the metal plate 1a defining the housing of the metal-closed switchgear 100 is closed. Since the circuit breaker can be moved and the front door cannot be opened and closed during the circuit breaker insertion / removal operation, the operator can be prevented from the danger that occurs when the circuit breaker is opened / closed during switchgear maintenance and inspection. It becomes possible to protect.

  That is, according to the embodiment of the present invention, the circuit breaker can be moved with the door of the switchgear housing closed. It is possible to realize a switchgear circuit breaker loading / unloading system that eliminates the possibility of danger to workers performing maintenance inspections when performing loading / unloading operations.

  The present invention is applicable to a system in which a circuit breaker is moved in and out during maintenance of a switchgear that constitutes a substation facility used in a power plant, a substation, a building, a factory, or the like.

The side view which shows the metal closed type switchgear which is one Example of this invention. The side view of the circuit breaker arrange | positioned at the metal closed type switchgear of the Example of FIG. The front view which shows the circuit breaker compartment of the metal closed type switchgear of FIG. 1 with the front door closed. The front view which shows the circuit breaker compartment of the metal closed type switchgear of FIG. 1 with the front door open. The top view which shows the circuit breaker compartment of the metal closed type switchgear of FIG. The side view which shows the movement state of a circuit breaker in the circuit breaker compartment of the metal closed type switchgear of FIG. Explanatory drawing which shows the interlock condition of the controller of the metal closed type switchgear of the Example of FIG.

Explanation of symbols

  1: main circuit compartment, 1a: metal plate, 2: bus compartment, 3: circuit breaker compartment, 4: control compartment, 5: front door, 6: front door handle, 7: circuit breaker, 8: service port, 9, 11, 22: Conductor, 10: Bushing, 12: Busbar, 13: Current transformer for instrument, 14: Rail, 15: Handle for breaker access, 16: Front door handle insertion port, 17: Door position detection switch, 18: Solenoid lock for front door locking, 21: connection part, 23: valve for current interruption, 24: operation mechanism part, 25: transmission part, 26: control cable, 27: secondary plug for circuit breaker, 28: wheel, 29: interruption Device position detection switch, 29b: plate member, 30: solenoid lock for locking handle insertion port, 31: circuit breaker handle insertion port, 32, 33: lock pin, 35: circuit breaker Operating position, 36: disconnected position of the breaker, 100: metal closed type switch gear, 200: controller.

Claims (6)

  The main circuit breaker provided in the switchgear housing, the door attached to the housing containing the breaker, and the circuit breaker detecting the moving position of the breaker in the switchgear housing. A position sensor is provided to form a first insertion port for inserting an operation handle for inserting / removing the circuit breaker into / from the door, and the circuit breaker is moved by operating the operation handle by engaging the inserted operation handle. A second insertion port is formed in the circuit breaker, and a first solenoid device is provided to operate the door locking. A command signal is given to the first solenoid device based on a detection signal from the position sensor of the circuit breaker. Switchgear circuit breaker taking in and out system characterized by having a controller that locks the door.   2. The switchgear circuit breaker loading / unloading system according to claim 1, wherein the controller is configured to perform a first operation based on a detection signal in which the circuit breaker detected by the position sensor of the circuit breaker is at an intermediate position between the operation position and the disconnection position. A switchgear circuit breaker insertion / removal system characterized in that a command signal is given to one solenoid device to lock the door.   The circuit breaker of the main circuit provided in the housing of the switchgear, the door attached to the housing that houses the circuit breaker, and the door open / close sensor that detects the open / closed state of the door, are shut off at the door A first insertion port for inserting an operation handle for inserting and removing the device is formed, and a second insertion port for engaging the inserted operation handle and moving the circuit breaker by operating the operation handle is a circuit breaker. And a second solenoid device for locking the second insertion port of the circuit breaker is provided, and a command signal is given to the second solenoid device based on a detection signal from the door opening / closing sensor to A switchgear circuit breaker insertion / removal system comprising a controller for locking the second insertion slot.   The switchgear circuit breaker loading / unloading system according to claim 3, wherein the controller gives a command signal to the second solenoid device based on the door open detection signal detected by the door open / close sensor, and outputs the circuit breaker first. A switchgear circuit breaker insertion / removal system characterized by being configured to lock the second insertion slot.   The main circuit breaker provided in the switchgear housing, the door attached to the housing containing the breaker, the door open / close sensor for detecting the open / closed state of the door, and the switchgear housing A circuit breaker position sensor for detecting a moving position of the circuit breaker at the first position, forming a first insertion port for inserting an operation handle for inserting and removing the circuit breaker into and out of the door, and engaging with the inserted operation handle. The second insertion port for moving the circuit breaker by the operation of the operation handle is formed in the circuit breaker, the first solenoid device for operating the door locking, and the second insertion port locking of the circuit breaker And a second solenoid device for performing the operation, giving a command signal to the first solenoid device based on the detection signal from the position sensor of the circuit breaker to lock the door, and based on the detection signal from the door opening / closing sensor Give a command signal to the second solenoid device Breaker out system of the switchgear, characterized in that it comprises a control device for locking the second insertion opening of the cross-sectional unit.   The switchgear circuit breaker loading / unloading system according to claim 5, wherein the controller is configured to perform a first operation based on a detection signal in which the circuit breaker detected by the position sensor of the circuit breaker is at an intermediate position between the operation position and the disconnection position. A command signal is given to one solenoid device to lock the door, and a command signal is given to the second solenoid device based on the door open detection signal detected by the door opening / closing sensor to insert the second circuit breaker. A switchgear circuit breaker taking in and out system characterized by being configured to lock the mouth.

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