JP2016024927A - Wipe amount measuring method of breaker and wipe amount measuring device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wipe amount measuring method of a breaker that is appropriate in spite of such a structure that a wipe amount cannot be directly measured, and a wipe amount measuring device therefor.SOLUTION: In a breaker 100, a driving operation is performed by an operation device 6 so as to open/close a movable contact 7 of a breaking part 13 including the movable contact 7 and a stationary contact 8 which are disposed oppositely to each other, relatively to the stationary contact 8, and the driving operation of the operation device 6 is transmitted to the breaking part 13 via a link mechanism 12. When measuring a wipe amount of a wipe spring 34 which is installed between the link mechanism and the breaking part and gives a contact pressure of the movable contact toward the stationary contact, after the breaking part is brought into a breaking state, and the movable contact is moved from an open position to a contact position, a predetermined position during the movement is defined as a reference value, a distance in the case where the wipe spring is further displaced and kept closed is defined as a stroke length, and a value resulting from subtracting the reference value from the stroke length is measured as the wipe amount of the wipe spring.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a circuit breaker wipe amount measuring method and a wipe amount measuring apparatus thereof, and more particularly to a circuit breaker wipe amount measuring method and a wipe amount measuring method that are suitable even when the circuit breaker wipe amount cannot be directly measured structurally. Relates to the device.

  2. Description of the Related Art An electromagnetically operated switchgear that opens and closes a circuit breaker such as a vacuum circuit breaker using the electromagnetic force of an electromagnetically operated device is known. In this electromagnetically operated switchgear, energy for driving the electromagnet is stored in the capacitor, electromagnetic force is generated according to the energy stored in the capacitor, and the driving force associated with this electromagnetic force is transmitted via the link mechanism. A configuration is employed in which a vacuum circuit breaker is turned on.

  In addition, the shut-off spring is compressed to store energy in the shut-off spring when it is turned on, and when it is opened, a current in the opposite direction to the electromagnet coil is passed to generate a reverse electromagnetic force from the electromagnet. A configuration is adopted in which the vacuum circuit breaker is opened and closed by applying the force and the spring force accumulated in the breaker spring to the link mechanism as a driving force in the direction opposite to that at the time of closing.

  By the way, since the vacuum circuit breaker is used in a harsh environment for over 20 years, a wipe spring that applies contact pressure to the movable contact when the vacuum circuit breaker is repeatedly opened and closed over a long period of use. The amount of wipe will decrease. If this wipe amount deviates from the predetermined wipe amount, it becomes impossible to apply a predetermined contact pressure between the contacts, the contact resistance increases, the heat generated by energization increases, and an accident may occur. Will arise. In order to prevent accidents, it is necessary to periodically measure and adjust the wipe amount.

  As a conventional technique for measuring the wipe amount in such a vacuum circuit breaker, there is one described in Patent Document 1. This Patent Document 1 is provided with a sliding resistor whose resistance value changes in response to the rotation of the drive shaft of the vacuum circuit breaker, and the output change is oscillographed along with the change of the circuit breaker contact from non-conduction to conduction. It is described that the wipe amount is measured by displaying.

JP-A-6-331675

  However, in the conventional wipe amount measurement, if the wipe amount is to be measured when checking the vacuum circuit breaker, it is possible to place the vacuum circuit breaker on the gantry and remove the front cover to measure the actuator stroke. First, it is necessary to be able to measure the actuator stroke or breaker stroke from the bottom surface, and the wipe amount is measured from that state, but if the measurement unit of the wipe amount is further molded, wipe The quantity cannot be measured directly. Moreover, in patent document 1 mentioned above, the measuring instrument for measuring the amount of wipe | wipe becomes large, and also a special instrument is needed.

  The present invention has been made in view of the above-described points, and the object of the present invention is to provide a large amount of wipe without using a special measuring instrument, even if the structure cannot directly measure the amount of wipe. It is an object to provide a circuit breaker wipe amount measuring method and a wipe amount measuring apparatus thereof.

  According to the circuit breaker wipe amount measuring method of the present invention, in order to achieve the above-mentioned object, the movable contact of the breaker provided with the movable contact and the fixed contact arranged opposite to each other should be opened and closed with respect to the fixed contact. A circuit breaker that performs a driving operation with an operating device and transmits the driving operation of the operating device to the blocking unit via a link mechanism, and is installed between the link mechanism and the blocking unit, and the movable contact In measuring the wipe amount of the wipe spring that applies the contact pressure to the fixed contact, after the blocking portion is in the blocking state, the movable contact is moved from the open position to the contact position, and a predetermined position during the movement Is the reference value, the distance when the wipe spring is further displaced and held is the stroke length, and the value obtained by subtracting the reference value from the stroke length is measured as the wipe amount of the wipe spring. The features.

  Specifically, after the shut-off portion is in a shut-off state, the operating device is operated by a manual throwing jig, and the driving force of the operating device operated by the manual throwing jig is passed through the link mechanism and the insulating rod. The movable contact is moved from the open position to the contact position and brought into contact with the fixed contact by being transmitted to the wipe spring. The distance between the bottom surface of the carriage and the insulating rod is set to a reference value D1, and the manual insertion jig is operated from that state to displace the wipe spring, and the bottom surface of the carriage and the insulation when the wipe spring contracts. The distance of the rod is defined as a stroke length D2, and D2-D1 is measured as the wipe amount of the wipe spring.

  According to another aspect of the present invention, there is provided a circuit breaker wipe amount measuring apparatus including a movable contact and a fixed contact arranged opposite to each other, and a movable contact of the breaker connected to the fixed contact. An operating device that performs a driving operation to open and close the door, a link mechanism that transmits a driving operation of the operating device to the blocking unit, and a fixed mechanism that is installed between the link mechanism and the blocking unit. A wipe spring that applies contact pressure to the contact, and has a manual insertion jig that moves the movable contact from the open position to the contact position when the interruption portion is in the interruption state. A predetermined position when the movable contact moves from the open position to the contact position is a reference value, a distance when the wipe spring is further displaced and held is a stroke length, and the reference value is subtracted from the stroke length. Value And measuring a wipe of wiping spring.

  Specifically, the movable contact is moved from the open position to the contact position by transmitting the driving force of the operating device operated by the manual insertion jig to the wipe spring via the link mechanism and the insulating rod. The distance between the bottom surface of the carriage on which the breaker is mounted and the insulating rod at the time when the circuit breaker is brought into contact is brought into contact with the fixed contact and becomes the reference value D1. Measure the distance between the bottom surface of the carriage and the insulating rod when the wipe spring is contracted by operating the manual loading jig and the wipe spring is contracted as the stroke length D2, and D2-D1 as the wipe amount of the wipe spring It is characterized by doing.

  According to the present invention, even if the structure is such that the wipe amount cannot be directly measured, there is an effect that the wipe amount can be measured without using a special measuring instrument.

It is a figure which shows the vacuum circuit breaker with which Example 1 of the wiper amount measuring apparatus of the circuit breaker of this invention is applied. It is sectional drawing which shows the detail of the insulating rod vicinity of FIG. It is a figure which shows a part of electromagnetic operating device 6 for demonstrating Example 2 of the wiper amount measuring method of the circuit breaker of this invention.

  The circuit breaker wipe amount measuring method and the wipe amount measuring apparatus according to the present invention will be described below based on the illustrated embodiments.

  1 and 2 show the configuration of a vacuum circuit breaker to which the first embodiment of the circuit breaker wipe amount measuring apparatus of the present invention is applied.

  As shown in FIG. 1, the vacuum circuit breaker 100 to which the circuit breaker wipe amount measuring apparatus according to the first embodiment of the present invention is applied mainly has a function of interrupting and restoring an accident current. A movable iron core 1 and a fixed iron core 2 arranged, a coil 3 for separating or contacting the movable iron core 1 and the fixed iron core 2 according to electromagnetic force, and an electromagnet 5 arranged at a lower center portion of the housing 4, which will be described later. An electromagnetic operating device 6 that controls and outputs an operating force for opening and closing the unit 13, and a movable contact 7 and a fixed contact 8 that are installed in the vacuum valve 14 and face each other are generated from the electromagnet 5. As described above, the driving force associated with the electromagnetic force is separated or contacted via the link mechanism 12 including the movable rod 9, the lever 10, and the insulating rod 11 that constitutes the electromagnetic operating device 6, and interrupts or inputs the current. The vacuum circuit breaker 100 having the configuration And mounting, inserted into the board, it is schematically configured from a mobile carriage 33 which is movable in order to adjust the state of the vacuum circuit breaker 100 to the ON position / off position / disconnected position.

  Both the interruption | blocking part 13 and the electromagnetic operating device 6 perform an up-and-down linear motion, and the linear operation | movement of the interruption | blocking part 13 can be measured by measuring the linear motion by the side of the electromagnetic operating device 6. FIG.

  The movable rod 9 of the electromagnetic operating device 6 includes a lower movable rod 9A connected to the lever 10 by a movable pin 12a, a central movable rod 9B pin-connected to the lower movable rod 9A, and an upper portion connected to the central movable rod 9B. The movable rod 9C is composed of a movable rod 9 (lower movable rod 9A, central movable rod 9B, upper movable rod 9C) that moves through the lever 10 and the insulating rod 11 of the link mechanism 12. It is transmitted to the blocking unit 13.

  In the lever 10 described above, with the shaft 10c as the main axis, the operating unit side lever 10a is connected to the electromagnetic operating device 6 side, the blocking unit 13 side is connected, and the blocking unit side lever 10b is connected to the substantially opposite side of the operating unit side lever 10a. It has a structured. The lever 10 is connected to the movable rod 9 at the lower part of the movable rod 9 by the tip of the operating device side lever 10a and the movable pin 12a, and the blocking portion 13 is connected to the blocking portion side of the blocking portion side lever 10b. The tip is connected to the bolt portion of the insulating rod 11 by the movable pin 12b. The blocking portion side lever 10b is rotatably supported by the connecting fitting 39 via the movable pin 12b. Further, the connecting fitting 39 has a metal in the insulating rod 11 in a through hole (not shown) in the axial direction. A rod 11a made of metal is inserted into this metal rod 11a, and a screw thread is provided, and a loosening prevention nut 40 and a spring, for example, a double nut consisting of an eccentric nut with a wedge and a nut with a keyway, are screwed into this. The metal fitting 39 is sandwiched from above and below by a nut 42 via a washer 41 and connected.

  The electromagnet 5 includes a movable iron core 1, a fixed iron core 2, a coil 3, a movable rod 9, two movable flat plates 15A and 15B, a permanent magnet 16, iron covers 17 and 18 formed in a cylindrical shape, and an iron support. The coils 3 are housed in a coil bobbin 22 disposed between the support plate 21 and the support plate 19.

  The above-described electromagnet 5 is installed at a position where a minute gap is secured in addition to the stroke length of the movable rod 9 on the lower part of the movable flat plates 15A and 15B and the upper part of the permanent magnet 16 in order to maintain the charged and held state. is there. The electromagnet 5 is formed by magnetizing and connecting a donut plate-like permanent magnet 16 on a support plate 21 which is a square plate with a hole through which the movable rod 9 passes.

  Further, the fixed iron core 2 is a donut plate-like component, and the lower movement of the movable rod 9 with respect to the bottom of the movable iron core 1 is performed so that the movable flat plates 15A and 15B do not directly contact the electromagnet 5 when being inserted. It plays the role of support and stopper on the top surface.

  The coil 3 has a structure in which an electric wire is wound around a coil bobbin 22, and the movable rod 9 is installed in the lower part of the electromagnet 5 so as to penetrate the bobbin hole. The coil 3 changes the direction of current flow so that the direction of the magnetic field generated by the coil 3 is the same as or opposite to the magnetic field generated by the electromagnet 5, thereby strengthening or weakening the magnetic field generated by the electromagnet 5. Can be.

  The central movable rod 9B is provided with two large and small movable flat plates 15A and 15B. This increases the facing distance between the upper movable flat plate 15A and the iron cover 17, and thus the iron cover 17 is increased. This is to reduce the leakage magnetic flux to the head. Further, a support plate 23 is connected to the lower side of the central movable rod 9B, and a ring-like shape is drawn between the support plate 23 and the base 24 to draw a circle centered on the axis of the central movable rod 9B. A cutoff spring 25 is attached.

  The cutoff spring 25 applies an elastic force for separating the movable iron core 1 from the fixed iron core 2 to the central movable rod 9B via the support plate 23. In order to pull away the movable rod 9 upward at the time of interruption, it is disposed below the movable rod 9. A permanent magnet 16 is disposed around the movable iron core 1, and the permanent magnet 16 is fixed to the support plate 21. The fixed iron core 2 is fixed to the support plate 19 using bolts and nuts.

  As shown in FIG. 2, the insulating rod 11 is formed by covering a metal rod 11 a with an insulator 35, and a predetermined contact with the fixed electrode 8 of the movable contact 7 inside the insulator 35. A wipe spring 34 for applying pressure is incorporated.

  On the other hand, the upper side of the insulating rod 11 is connected to the movable feeder 29 via the flexible conductor 26 and is also connected to the movable conductor 27 of the blocking portion 13. The movable conductor 27 is connected to the movable contact 7 of the blocking portion 13, and the fixed contact 8 is disposed opposite to the movable contact 7. The fixed contact 8 is connected to a fixed conductor 28. These are housed together with the movable contact 7 in a vacuum valve 14 that constitutes the blocking portion 13, and the inside of the vacuum valve 14 is kept in a vacuum.

  The fixed conductor 28 is connected to a fixed feeder 30, an upper contactor (main circuit conductor) 31 is connected to the fixed feeder 30, and a lower contactor (main circuit conductor) 32 is connected to the movable feeder 29, Each contactor (main circuit conductor) 31 and 32 is connected to a power cable such as a distribution line.

  In this embodiment, in the vacuum circuit breaker 100 having the above-described configuration, in order to measure the wipe amount of the wipe spring 34, the movable contact 7 is moved from the open position to the contact position when the shut-off portion 13 is shut off. A manual loading jig is provided.

  This manual throwing jig has a fixing plate 52 for mounting the bolt 51 at a position where the upper end of the upper movable rod 9C of the movable rod 9 can be pushed downward by the bolt 51 with a screw or the like inside the housing front top plate portion 4a. The bolt 51 is attached to the fixed plate 52 from above the housing front top plate portion 4a.

  In addition, in the present embodiment, the movable contact 7 contacts the fixed contact 8 via the connection lines 36a and 36b in each of the upper contactor (main circuit conductor) 31 and the lower contactor (main circuit conductor) 32. A buzzer checker 37 for notifying that a conductive state has been established and a DC power supply 38 for the buzzer checker 37 are connected.

  Next, a method for measuring the wipe amount of the wipe spring 34 in the configuration described above will be described.

  First, the vacuum circuit breaker 100 is turned off, and the bolt 51 is adjusted so as to come into contact with the upper movable rod 9 </ b> C of the movable rod 9. Next, the DC power supply 38 is turned on, the bolt 51 is turned and the movable rod 9 is pushed, so that the driving force is transmitted to the blocking portion 13 via the link mechanism 12 and the insulating rod 11, and the movable contact 7 The state is changed to a contact state where the fixed contact 8 comes into contact. When the movable contact 7 and the fixed contact 8 come into contact and become conductive, and the buzzer checker 37 sounds, the bolt 51 is stopped from turning. At this time, the vacuum valve 14 built in the shut-off unit 13 to which the buzzer checker 37 is attached becomes a touch point (reference position).

  In this state, the distance from the bottom surface of the movable carriage 33 to the insulating rod 11 is measured using a depth gauge or the like, and this is set as a reference value D1. The same operation is performed for the other phases, and the touch point distance D1 is measured. When the bolt 51 is further turned, the attractive force of the permanent magnet 16 exceeds the force of the wipe spring 34 and the cutoff spring 25, and the electromagnetic operating device 6 is automatically turned on. In this state, the distance from the bottom surface of the movable carriage 33 to the insulating rod 11 is again measured using a depth gauge or the like, and this is defined as a stroke length D2.

  The wipe amount (dimension) can be calculated by calculating the distance difference in each phase obtained by the dimension measuring operation = D2−D1.

  That is, in this embodiment, after the blocking portion 13 is set in the blocking state, the movable rod 9 of the electromagnetic operating device 6 is operated by the bolt 51, and the driving force of the electromagnetic operating device 6 operated by the bolt 51 is applied to the link mechanism 12. Then, by transmitting to the wipe spring 34 via the insulating rod 11, the movable contact 7 is moved from the open position to the contact position and brought into contact with the fixed contact 6, and the movement at the time when this conduction state is established. The distance between the bottom surface of the carriage 33 and the insulating rod 11 is set to the reference value D1, and the wiper spring 34 is displaced by operating the bolt 51 from this state, and the bottom surface of the movable carriage 33 when the wipe spring 34 contracts. The distance of the insulating rod 11 is the stroke length D2, and this D2-D1 is measured as the wipe amount of the wipe spring.

  With this embodiment, even when the wipe amount of the wipe spring 34 cannot be directly measured from the mechanism portion having the wipe spring 34, the wipe amount can be calculated from the difference between the measurement of the alternative portion and the displacement.

  As described above, according to the present embodiment, even if the structure is such that the wipe amount cannot be directly measured, an effect that the wipe amount can be measured without using a special measuring instrument is obtained.

  FIG. 3 shows a part of an electromagnetic operating device 6 for explaining a second embodiment of the circuit breaker wipe amount measuring method of the present invention.

  This embodiment is an alternative when the amount of displacement of the insulating rod 11 below the blocking portion 13 cannot be measured as in the first embodiment described above. For this reason, the configuration is the same as that of the first embodiment, and a description thereof is omitted here.

  In the present embodiment shown in FIG. 3, the front top plate of the housing starts from the top end of the bolt 51 in a state where the bolt 51 for operating the movable rod 9 of the electromagnetic operating device 6 and the upper movable rod 9 </ b> C of the electromagnetic operating device 9 are in contact. The distance to 4a is set to L1, and the bolt 51 is turned so that the distance from the top end of the bolt 51 to the case front top plate 4a when the head of the bolt 51 is lowered to the case front top plate 4a. When L2 and the drive lever ratio of the link mechanism 12 is a, a (L1-L2) is measured as the wipe amount of the wipe spring.

  This makes it possible to measure the wipe amount from the upper part of the main body of the vacuum circuit breaker 100 without disassembling the vacuum circuit breaker 100 that is the object of wipe measurement (such as removing the front cover) and without using a special measurement stand. In particular, the wipe measurement time during maintenance can be greatly reduced.

  Even in this embodiment, the effect is the same as that of the first embodiment.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. It is possible to add, delete, and replace the configuration of a part of the configuration of the embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Movable iron core, 2 ... Fixed iron core, 3 ... Coil, 4 ... Housing | casing, 4a ... Housing front top plate part, 5 ... Electromagnet, 6 ... Electromagnetic operating device, 7 ... Movable contact, 8 ... Fixed contact, 9 ... Movable rod, 9A ... Lower movable rod, 9B ... Center movable rod, 9C ... Upper movable rod, 10 ... Lever, 10a ... Actuator side lever, 10b ... Shutter side lever, 10c ... Shaft, 11 ... Insulating rod, 11a ... Metal rod, 12 ... Link mechanism, 12a, 12b ... Movable pin, 13 ... Blocking part, 14 ... Vacuum valve, 15a, 15B ... Movable flat plate, 16 ... Permanent magnet, 17, 18 ... Cover, 19, 21, 23 ... Support plate, 20 ... fixed rod, 21 ... coil bobbin, 24 ... base, 25 ... cutoff spring, 26 ... flexible conductor, 27 ... movable conductor, 28 ... fixed conductor, 29 ... movable feeder, 30 ... fixed feeder, 31 ... Contactor, 32 ... Lower contactor, 33 ... Moving cart, 34 ... Wipe spring, 35 ... Insulator, 36a, 36b ... Connection line, 37 ... Buzzer checker, 38 ... DC power supply, 39 ... Connecting bracket, 40 ... Locking nut , 41 ... Spring washer, 42 ... Nut, 51 ... Bolt, 52 ... Fixed plate, 100 ... Vacuum circuit breaker.

Claims (14)

A drive operation is performed by an operating device to open and close the movable contact of the interrupting portion provided with a movable contact and a fixed contact arranged opposite to each other, and the drive operation of the operation device is performed via a link mechanism. A circuit breaker for transmitting to the interrupting part, which is installed between the link mechanism and the interrupting part, and for measuring the amount of wipe of a wipe spring that applies a contact pressure of the movable contact to the fixed contact.
After the blocking portion is in the blocking state, the movable contact is moved from the open position to the contact position, a predetermined position at the time of movement is set as a reference value, and the wipe spring is further displaced and held. A method of measuring a wiper amount of a circuit breaker, wherein a distance is a stroke length, and a value obtained by subtracting the reference value from the stroke length is measured as a wipe amount of a wipe spring. In the circuit breaker wipe amount measuring method according to claim 1,
After the shut-off portion is in the shut-off state, the operating device is operated by a manual closing jig, and the driving force of the operating device operated by the manual charging jig is applied to the wipe spring via the link mechanism and the insulating rod. By transmitting, the movable contact is moved from the open position to the contact position and brought into contact with the fixed contact to be in a conductive state. The distance between the insulating rod is set to a reference value D1, and the distance between the bottom surface of the carriage and the insulating rod when the wipe spring is contracted by operating the manual insertion jig from the state to stroke the stroke. A method for measuring a wiper amount of a circuit breaker, characterized in that the length is D2, and D2-D1 is measured as a wipe amount of a wipe spring. In the circuit breaker wipe amount measuring method according to claim 2,
The circuit breaker wipe amount measuring method, wherein the manual loading jig is a bolt, and the movable rod of the operating device is pushed by turning the bolt to operate the operating device. In the circuit breaker wipe amount measuring method according to claim 3,
A screw hole is provided in the housing top plate portion of the operating device at a position facing the movable rod of the operating device, and the movable rod of the operating device is pushed by inserting and turning the bolt into the screw hole. A circuit breaker wipe amount measuring method, wherein an operating device is operated. The circuit breaker wipe amount measuring method according to any one of claims 2 to 4,
A circuit breaker wipe amount measuring method, comprising: a buzzer checker for notifying that the movable contact is in contact with the fixed contact and being in a conductive state, and the position where the buzzer check sounded is the reference value D1 . The circuit breaker wipe amount measuring method according to claim 5,
A method of measuring the amount of wiper of a circuit breaker, characterized in that when the buzzer checker sounds, turning of the bolt is stopped. In the circuit breaker wipe amount measuring method according to claim 1,
The distance from the top end of the bolt to the casing top plate of the operating device when the operating device operating bolt and the movable rod of the operating device are in contact with each other is set to L1, and the bolt is turned to The distance from the top end of the bolt to the casing top plate of the operating device when the head of the bolt is lowered to the casing top plate of the operating device is L2, and the drive lever ratio of the link mechanism A method of measuring a wiper amount of a circuit breaker, wherein a (L1-L2) is measured as a wipe amount of a wipe spring when is a. The circuit breaker wipe amount measuring method according to claim 7,
A screw hole is provided in the housing top plate portion of the operating device at a position facing the movable rod of the operating device, and the movable rod of the operating device is pushed by inserting and turning the bolt into the screw hole. A circuit breaker wipe amount measuring method, wherein an operating device is operated. A blocking part having a movable contact and a fixed contact arranged opposite to each other, an operating device for performing a driving operation to open and close the movable contact of the blocking part with respect to the fixed contact, and a driving operation of the operating device A link mechanism that transmits to the blocking part; and a wipe spring that is installed between the link mechanism and the blocking part and that gives a contact pressure of the movable contact to the fixed contact;
When the shut-off portion is in a shut-off state, a manual closing jig is provided that moves the movable contact from the open position to the contact position, and the movable contact in the manual closing jig moves from the open position to the contact position. The predetermined position is a reference value, the distance when the wipe spring is further displaced and held is the stroke length, and a value obtained by subtracting the reference value from the stroke length is measured as the wipe amount of the wipe spring. A circuit breaker wipe amount measuring device. In the circuit breaker wipe amount measuring device according to claim 9,
The movable contact is moved from the open position to the contact position by transmitting the driving force of the operation device operated by the manual insertion jig to the wipe spring via the link mechanism and the insulating rod, and the fixed The contact point is brought into a conducting state, and the distance between the bottom surface of the carriage on which the circuit breaker is mounted and the insulating rod at the time when the conducting state is brought is set as a reference value D1, and the manual throwing jig is moved from that state. The distance between the bottom surface of the carriage and the insulating rod when the wipe spring is contracted by operation to be contracted is a stroke length D2, and D2-D1 is measured as the wipe amount of the wipe spring. Device for measuring the amount of wiper for circuit breakers. The apparatus for measuring a wiper amount of a circuit breaker according to claim 10,
The circuit breaker wipe amount measuring apparatus, wherein the manual insertion jig is a bolt, and the operating rod is operated by rotating the bolt to push the movable rod of the operating device. In the circuit breaker wipe amount measuring device according to claim 11,
A screw hole is formed in the housing top plate portion of the operating device at a position facing the movable rod of the operating device, and the movable rod of the operating device is pushed by inserting and turning the bolt into the screw hole. The circuit breaker wipe amount measuring device, wherein the operation device is operated. The apparatus for measuring a wiper amount of a circuit breaker according to any one of claims 10 to 12,
A circuit breaker wipe amount measuring apparatus comprising a buzzer checker for notifying that the movable contact is in contact with the fixed contact and is in a conductive state, and a position where the buzzer checker sounds is the reference value D1. . The circuit breaker wipe amount measuring device according to claim 13,
The buzzer checker includes a power supply device for turning on the buzzer checker, and is connected to a main circuit conductor of the circuit breaker via a connection line.

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