TW201604908A - Sliding touch amount measurement method of breaker and its sliding touch amount measurement device - Google Patents

Abstract

Provided is a structure capable of measuring the sliding touch amount without using a large-scale and special measurement equipment, even if the sliding touch amount cannot be directly measured. The sliding touch amount measurement method of breaker according to the present invention aims to achieve the aforementioned objective, characterized in that: a breaking part is provided with a moveable contact and a stationary contact opposite to each other, and the breaker makes use of an operation device capable of opening/closing the aforementioned moveable contact relative to the stationary contact to perform a driving operation. The driving operation of the aforementioned operation device is transferred to the breaking part through a linking means for being configured between the linking means and the breaking part. When measuring the sliding touch amount of a sliding touch spring that applies a touch pressure to the moveable contact relative to the stationary contact, the breaking part is made to be in a breaking state and then the moveable contact is moved from an off position to a touch position. By taking the predetermined position in movement as a reference value, the sliding touch spring is further moved and the distance for keeping in connection is defined as a stroke length, and the difference value between the reference value and the stroke length is used for measuring the sliding touch amount of the sliding touch spring.

Description

Method for measuring sliding contact of interrupter and sliding contact measuring device thereof

The present invention relates to a method for measuring a sliding contact amount of a circuit breaker and a sliding contact amount measuring device thereof, and more particularly to a sliding contact of a suitable interrupter even in the case where the sliding amount of the interrupter cannot be directly measured by the structure. Measuring method and measuring device for sliding amount.

An electromagnetic operation type opening and closing device that opens and closes a breaker such as a vacuum interrupter by an electromagnetic force of an electromagnetic operating device is known. In the electromagnetic operation type opening and closing device, the energy for driving the electromagnet is accumulated in the capacitor, and the electromagnetic force is generated based on the energy stored in the capacitor, and the driving force generated by the electromagnetic force is transmitted through the link mechanism. The composition of the vacuum interrupter is turned on.

Further, when the switch is turned on, the blocking spring is compressed to accumulate energy in the blocking spring, and when it is opened, it is connected to the coil of the electromagnet, so that a reverse current flows when it is turned on, and a reverse direction is generated from the electromagnet. In the electromagnetic force, the electromagnetic force and the spring force accumulated in the blocking spring are configured to open and close the vacuum interrupter by providing a link mechanism to the link mechanism when the driving force is reversed.

In addition, the vacuum interrupter is used for a user who has been in a harsh environment for more than 20 years. Therefore, when the vacuum interrupter is opened and closed for a long period of time, the sliding contact of the sliding contact spring is applied to the movable contact. The amount will decrease. When the amount of slippage is out of a predetermined amount of slip, it is impossible to provide a predetermined contact pressure between the contacts, the contact resistance is increased, and the heat generation due to energization is increased to cause a possibility of malfunction. To prevent failures before they occur, it is necessary to periodically measure the amount of sliding and make adjustments.

The prior art for measuring the amount of sliding contact of such a vacuum interrupter is described in Patent Document 1. Patent Document 1 describes a sliding rheostat in which a resistance value is changed in response to rotation of a drive shaft of a vacuum interrupter, and the output change is displayed on the oscilloscope together with a change from non-conducting to conduction of the contact of the interrupter. To determine the amount of slip.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Publication No. Hei 6-331675

However, in the case of the measurement of the historical sliding amount, when it is desired to measure the sliding amount at the point of check of the vacuum interrupter, it is usually necessary to carry the vacuum interrupter on the gantry first, and the measuring operation can be performed by removing the front cover. The stroke of the device can be measured from the bottom surface on the stroke of the manipulator or the stroke of the interrupting portion. From this state, the amount of slip is measured, but the measuring portion of the sliding amount is further molded. In this case, the amount of sliding cannot be directly measured. Further, in the above-described Patent Document 1, the measuring instrument for measuring the amount of sliding is large-scale, and a special tool is required.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a cover that can measure the amount of sliding without using a large-scale and special measuring instrument even if the structure cannot directly measure the amount of sliding contact. The method for measuring the sliding amount of the breaker and the sliding amount measuring device thereof.

In order to achieve the above object, the method for measuring the sliding amount of the circuit breaker according to the present invention is characterized in that the interrupter is movable in such a manner that a blocking portion having a movable contact and a fixed contact disposed opposite to each other can be provided. The operation device that opens and closes the contact with the fixed contact is driven, and the driving operation of the operation device is transmitted to the blocking portion through the link mechanism, and is provided between the link mechanism and the blocking portion. When measuring the sliding contact amount of the sliding contact of the movable contact with respect to the contact pressure of the fixed contact, after the blocking portion is in the blocking state, the movable contact is moved from the disconnected position to the contact position. The predetermined position at the time of the movement is used as a reference value, and the distance at which the sliding contact spring is further displaced to be held on and off is the stroke length, and the value of the reference value is differentiated from the stroke length as the sliding contact spring. The amount of slip is measured.

Specifically, after the blocking portion is in the blocking state, the operating device is operated by manually turning on the jig, and the driving force of the operating device operated by manually turning on the jig is transmitted through the link mechanism and the insulation. Rod And the sliding contact spring is moved to move the contact point from the off position to the contact position to contact the fixed contact to be in an on state, and to mount the interrupter at the time of the conduction state The distance between the bottom surface and the insulating rod is a reference value D1, and at the same time, the front end of the cart and the insulating rod when the sliding spring is disengaged by the manual closing of the jig from the state The distance is the stroke length D2, and the aforementioned D2-D1 is measured as the sliding amount of the sliding spring.

Further, in order to achieve the above object, the slip-measurement measuring device for a circuit breaker according to the present invention includes: a blocking portion including a movable contact and a fixed contact arranged to face each other; and the blocking can be performed An operating device for driving operation of opening and closing the movable contact with respect to the fixed contact; a link mechanism for transmitting the driving operation of the operating device to the blocking portion; and being disposed between the linking mechanism and the blocking portion a slide spring that gives a contact pressure to the fixed contact of the movable contact; and a manual connection that moves the movable contact from the off position to the contact position when the blocking portion is in an interrupted state And setting a predetermined position when the movable contact of the manually-connected jig is moved from the off position to the contact position as a reference value, so that the slide spring is further displaced and the distance when the contact is held on is a stroke The length is measured by taking the value of the reference value as a difference from the stroke length as the sliding amount of the sliding spring.

Specifically, the driving force of the operating device that is operated by the manually turning on the jig is transmitted to the sliding spring through the link mechanism and the insulating rod, thereby moving the movable contact from the disconnected position to the contact position. And being in contact with the fixed contact to make a conduction state At the time of the conduction state, the distance between the bottom surface of the cart on which the above-mentioned breaker is mounted and the insulating rod is the reference value D1, and at the same time, the manual sliding of the jig is operated from the state to displace the sliding spring to cause the sliding When the contact spring contracts, the distance between the bottom surface of the cart and the insulating rod is the stroke length D2, and the D2-D1 is measured as the sliding amount of the sliding spring.

According to the present invention, even in the case where the sliding amount cannot be directly measured, the effect of measuring the amount of sliding can be measured without using a large-scale and special measuring instrument.

1‧‧‧ movable core

2‧‧‧Fixed core

3‧‧‧ coil

4‧‧‧ frame

4a‧‧‧The top part of the front of the frame

5‧‧‧Electromagnet

6‧‧‧Electromagnetic operating device

7‧‧‧ movable contact

8‧‧‧Fixed joints

9‧‧‧ movable rod

9A‧‧‧lower movable rod

9B‧‧‧Central movable rod

9C‧‧‧Upper movable rod

10‧‧‧ pole

10a‧‧‧Operator sidebar

10b‧‧‧shield sidebar

10c‧‧‧Axis

11‧‧‧Insulation rod

11a‧‧‧Metal pole

12‧‧‧Linking agency

12a, 12b‧‧‧ movable

13‧‧‧Interrupted section

14‧‧‧Vacuum valve

15A, 15B‧‧‧ movable plate

16‧‧‧ permanent magnet

17, 18 ‧ ‧ cover

19, 21, 23‧‧‧ support plates

20‧‧‧Fixed rod

21‧‧‧ coil holder

24‧‧‧Base

25‧‧‧Shutter spring

26‧‧‧Flexible conductor

27‧‧‧ movable conductor

28‧‧‧Fixed conductor

29‧‧‧ movable feeder

30‧‧‧Fixed feeder

31‧‧‧Upper contacts

32‧‧‧ Lower contact

33‧‧‧Mobile cart

34‧‧‧Sliding spring

35‧‧‧Insulators

36a, 36b‧‧‧ connection line

37‧‧‧Beep Tester

38‧‧‧DC power supply unit

39‧‧‧Connected metal parts

40‧‧‧Lock nuts

41‧‧‧Flexible washers

42‧‧‧ nuts

51‧‧‧ bolt

52‧‧‧ fixed board

100‧‧‧vacuum interrupter

Fig. 1 is a view showing a vacuum interrupter of a first embodiment of a sliding contact measuring device to which the interrupter of the present invention is applied.

Fig. 2 is a cross-sectional view showing details of the vicinity of the insulating rod of Fig. 1.

Fig. 3 is a view showing a part of the electromagnetic operating device 6 for explaining the second embodiment of the method for measuring the sliding amount of the interrupter of the present invention.

Hereinafter, a method of measuring the slip amount of the interrupter of the present invention and a sliding amount measuring device thereof will be described based on the illustrated embodiment.

[Example 1]

1 and 2, the configuration of the vacuum interrupter of the first embodiment in which the slip amount measuring device of the present invention is applied is shown.

As shown in Fig. 1, a vacuum interrupter 100 of the first embodiment in which the slip contact measuring device of the present invention is applied is mainly characterized by the interruption and recovery of a fault current, and is constituted by the following: a movable iron core 1 and a fixed iron core 2 disposed opposite to each other, and a coil 3 that separates or contacts the movable iron core 1 and the fixed iron core 2 according to an electromagnetic force, and an electromagnet 5 disposed at a lower central portion of the frame body 4, An electromagnetic operation device 6 that controls and outputs an operation force for opening and closing the blocking portion 13 to be described later, and a movable contact 7 and a fixed contact 8 that are disposed in the vacuum valve 14 so as to face each other, and the slave electromagnet 5 The driving force by the generated electromagnetic force is separated or contacted by the link mechanism 12 formed by the movable lever 9, the rod 10, and the insulating rod 11 constituting the electromagnetic operating device 6, and the current is blocked or turned on. The broken portion 13 is a movable cart 33 that can be moved by inserting the vacuum interrupter 100 having the above-described configuration into the disk and adjusting the state of the vacuum interrupter 100 to the ON position, the OFF position, and the OFF position. .

The blocking unit 13 and the electromagnetic operating device 6 perform linear motion in the vertical direction, and measure the linear motion on the side of the electromagnetic operating device 6 so that the linear motion of the blocking portion 13 can be measured.

Further, the movable lever 9 of the electromagnetic operating device 6 is a movable rod 9A that is coupled to the lower movable rod 9A by the rod 10 and the movable pin 12a, a central movable rod 9B that is coupled to the lower movable rod 9A, and an upper portion that is coupled to the central movable rod 9B. The movable rod 9C is configured to move through the movable rod 9 (the lower movable rod 9A, the central movable rod 9B, and the upper movable rod 9C) of the electromagnetic actuator 6 The rod 10 of the link mechanism 12 and the insulating rod 11 are transmitted to the blocking portion 13.

The above-described rod 10 has a shaft 10c as a main axis, and an operator side rod 10a is connected to the electromagnetic operation device 6 side, and a blocking portion is connected to the side of the blocking portion 13 on the substantially opposite side of the operator side rod 10a. The construction of the side bar 10b. Then, the lever 10 and the movable lever 9, the lower portion of the movable lever 9, and the front end portion of the operator side lever 10a are linked by the movable pin 12a, and the blocking portion 13 is the blocking portion of the blocking portion side bar 10b. The side front end is connected to the bolt portion of the insulating rod 11 by the movable pin 12b. The blocking portion side rod 10b is rotatably supported by the connecting metal member 39 via the movable pin 12b, and the insulating rod 11 is inserted into the through hole (not shown) in the axial direction of the connecting metal member 39. The metal rod 11a is provided with a threaded top, and the locking nut 40 and the elastic washer formed by the double nut of the wedge eccentric nut and the bolt hole nut are screwed therethrough. 41, and the nut 42 is connected to the connecting metal member 39 from above and below.

Further, 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, and a cover member 17 and 18 made of a tubular iron. The iron support plates 19 and 21 and the fixed rod 20 are configured, and the coil 3 is housed in a bobbin 22 disposed between the support plate 21 and the support plate 19.

The electromagnet 5 described above is provided in the upper portion of the movable flat plates 15A and 15B and the upper portion of the permanent magnet 16 in order to maintain the ON state, and the position of the small gap is ensured in addition to the stroke length of the movable lever 9. Further, the electromagnet 5 is attached to the support plate 21 which is a square plate having a hole through which the movable rod 9 passes through the center, and a ring-shaped permanent magnet 16 is attached. Being magnetized to connect.

Further, the fixed iron core 2 is a ring-shaped member, and the movable plate 15A, 15B does not directly contact the electromagnet 5 when it is turned on, and the lower side of the movable rod 9 is moved relative to the bottom of the movable iron core 1. And the upper surface is used as a support to play the role of the brake.

Further, the coil 3 is configured such that the bobbin 22 winds the electric wire, and the lower portion of the electromagnet 5 is provided so that the movable rod 9 penetrates the direction of the axial hole. The coil 3 changes the direction in which the current flows, and causes the direction of the magnetic field generated by the coil 3 to be in the same or opposite direction as the magnetic field generated by the electromagnet 5, thereby enhancing the magnetic field generated by the electromagnet 5 or vice versa.

Further, in the center movable lever 9B, two movable flat plates 15A and 15B are attached, in order to increase the opposing distance between the upper movable plate 15A and the iron cover member 17, and the cover member 17 made of iron is reduced. Leakage flux. Further, on the lower side of the center movable lever 9B, the support plate 23 is coupled, and between the support plate 23 and the base 24, a circular ring-shaped cover centering on the axis of the central movable rod 9B is attached. Broken spring 25.

The blocking spring 25 is provided with an elastic force for separating the movable iron core 1 from the fixed iron core 2, and is transmitted to the central movable rod 9B through the support plate 23, in order to be connected to the vacuum interrupter 100. When the power is blocked, the movable lever 9 is separated in the upward direction and placed below the movable lever 9. Further, 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 by using a bolt and a nut.

Further, as shown in Fig. 2, the insulating rod 11 and the metal rod 11a are formed by covering the insulator 35, and the predetermined contact of the fixed electrode 8 to the movable contact 7 is incorporated in the inside of the insulator 35. The sliding spring 34 of the pressure.

On the other hand, the upper side of the insulating rod 11 is connected to the movable feed line 29 through the flexible conductor 26, and is also coupled 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 coupled to the fixed conductor 28. These are housed in the vacuum valve 14 constituting the blocking portion 13 together with the movable contact 7, and the vacuum valve 14 is kept in a vacuum.

Further, the fixed conductor 28 is connected to the fixed feed line 30, the upper contact (main circuit conductor) 31 is connected to the fixed feed line 30, and the lower contact (main circuit conductor) 32 is connected to the movable feed line 29 for contact. The (main circuit conductors) 31 and 32 are connected to a power cable such as a distribution line.

In the vacuum interrupter 100 of the above-described configuration, in order to measure the amount of sliding contact of the slider spring 34, the movable contact 7 is disconnected when the blocking portion 13 is in the blocking state. The open position moves to the manual position of the contact position.

In the manual insertion of the jig, the front end of the upper movable lever 9C of the movable lever 9 is pushed downward by the bolt 51, and the fixing plate 52 for the attachment bolt 51 is placed on the front plate portion 4a of the casing. The inner side is fixed by screws or the like, and the bolt is placed from above the top plate portion 4a in front of the frame body. 51 is mounted on the fixed plate 52.

Further, in the present embodiment, each of the upper contact member (main circuit conductor) 31 and the lower contact member (main circuit conductor) 32 is connected to the movable contact 7 by the connection wires 36a and 36b. The buzzer tester 37 and its DC power supply device 38 in the case where the contact 8 is in an on state.

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

First, the vacuum interrupter 100 is placed in an interrupted state, and the bolt 51 is adjusted to come into contact with the upper movable rod 9C of the movable lever 9. Next, the power of the DC power supply unit 38 is turned on, and the bolt 51 is rotated to press the movable lever 9 so that the driving force is transmitted to the blocking portion 13 through the link mechanism 12 and the insulating rod 11, and is shifted into the movable contact 7 and fixed. Contact state of contact 8 contact. The movable contact 7 comes into contact with the fixed contact 8 to be in an on state, and when the buzzer 37 sounds, the rotation of the bolt 51 is stopped. At this time, the vacuum valve 14 built in the blocking portion 13 to which the buzzer 37 is attached is a contact (reference position).

In this state, the distance from the bottom surface portion of the cart 33 to the insulating rod 11 is measured by a depth gauge or the like, and this is referred to as a reference value D1. The same operation was performed for the other phases, and the distance D1 of the contact was measured. Further, when the bolt 51 is rotated, the attraction force of the permanent magnet 16 exceeds the force of the sliding spring 34 and the blocking spring 25, and the electromagnetic operating device 6 is automatically turned on. In this state, the distance from the bottom surface of the cart 33 to the insulating rod 11 is again moved, and the depth is measured by a depth gauge or the like to make the stroke length. Degree D2.

The difference (D2-D1) of the distances in the respective phases obtained by the above-described dimensional measurement operation is calculated so that the sliding amount (size) can be calculated.

That is, in the present embodiment, after the blocking portion 13 is in the blocking state, the movable lever 9 of the electromagnetic operating device 6 is operated by the bolt 51, and the electromagnetic operating device 6 operated by the bolt 51 is driven. The force is transmitted to the sliding spring 34 through the link mechanism 12 and the insulating rod 11, and the movable contact 7 is moved from the off position to the contact position to contact the fixed contact 6 to be in an on state, so that the conduction state is reached. The distance between the bottom surface of the moving cart 33 and the insulating rod 11 is the reference value D1, and the bottom surface of the moving cart 33 when the sliding spring 34 is displaced by the operation of the bolt 51 from the state. The distance from the insulating rod 11 is the stroke length D2, and D2-D1 is measured as the sliding amount of the sliding spring.

In the present embodiment, even when the sliding amount of the sliding spring 34 cannot be directly measured from the mechanism portion having the sliding spring 34, the sliding amount can be calculated from the difference between the measurement and the displacement of the replacement portion. .

As described above, according to the present embodiment, even in a structure in which the amount of sliding contact cannot be directly measured, the effect of measuring the amount of sliding can be measured without using a large-scale and special measuring instrument.

[Embodiment 2]

Figure 3 is a view showing the slip of the interrupter of the present invention. A part of the electromagnetic operating device 6 used in the second embodiment of the measuring method is shown.

This embodiment is an alternative to the case where the displacement amount 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 described above, and therefore the description herein is omitted.

In the present embodiment shown in Fig. 3, the upper end of the bolt 51 is placed in a state in which the bolt 51 for operating the movable lever 9 of the electromagnetic operating device 6 is in contact with the upper movable lever 9C of the electromagnetic operating device 9. The distance between the front portion 4a of the body front portion is L1, and the distance from the front end of the upper portion of the bolt 51 to the front portion 4a of the frame when the head of the bolt 51 is lowered to the front portion 4a of the front portion of the frame is L2, and the link is made. When the drive rod ratio of the mechanism 12 is a, a (L1-L2) is measured as the sliding contact amount of the sliding spring.

In this way, the vacuum interrupter 100 that is the target of the sliding measurement is not disassembled (the front cover or the like is removed), and the amount of the sliding contact is measured from the vacuum interrupter 100 without using a special measuring stand. The upper part of the body is measured, and in particular, the slip measurement time during maintenance can be greatly shortened.

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

Further, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all of the components described. As part of the composition of the embodiment, it can be constructed Add, delete, and replace.

1‧‧‧ movable core

2‧‧‧Fixed core

3‧‧‧ coil

4‧‧‧ frame

4a‧‧‧The top part of the front of the frame

5‧‧‧Electromagnet

6‧‧‧Electromagnetic operating device

7‧‧‧ movable contact

8‧‧‧Fixed joints

9‧‧‧ movable rod

9A‧‧‧lower movable rod

9B‧‧‧Central movable rod

9C‧‧‧Upper movable rod

10‧‧‧ pole

10a‧‧‧Operator sidebar

10b‧‧‧shield sidebar

10c‧‧‧Axis

11‧‧‧Insulation rod

12‧‧‧Linking agency

12a, 12b‧‧‧ movable

13‧‧‧Interrupted section

14‧‧‧Vacuum valve

15A, 15B‧‧‧ movable plate

16‧‧‧ permanent magnet

17, 18 ‧ ‧ cover

19, 21, 23‧‧‧ support plates

20‧‧‧Fixed rod

22‧‧‧ coil holder

24‧‧‧Base

25‧‧‧Shutter spring

26‧‧‧Flexible conductor

27‧‧‧ movable conductor

28‧‧‧Fixed conductor

29‧‧‧ movable feeder

30‧‧‧Fixed feeder

31‧‧‧Upper contacts

32‧‧‧ Lower contact

33‧‧‧Mobile cart

37‧‧‧Beep Tester

38‧‧‧DC power supply unit

39‧‧‧Connected metal parts

40‧‧‧Lock nuts

42‧‧‧ nuts

51‧‧‧ bolt

52‧‧‧ fixed board

100‧‧‧vacuum interrupter

D1‧‧‧ reference value

D2‧‧‧ length of the trip

Claims (14)

A method for measuring a sliding contact amount of a circuit breaker, characterized in that the interrupter is configured such that the movable contact portion of the blocking portion having the movable contact and the fixed contact disposed opposite to each other is opposite to the fixed contact The opening and closing operation device performs a driving operation, and the driving operation of the operation device is transmitted to the blocking portion through a link mechanism, and is provided between the link mechanism and the blocking portion, and the fixed contact is fixed to the movable contact. When the sliding contact amount of the contact pressure of the contact is measured, after the blocking portion is in the blocking state, the movable contact is moved from the disconnected position to the contact position, and the moving position is determined. The position is a reference value, and the distance at which the slide spring is further displaced to be held on and off is the stroke length, and the value obtained by dividing the reference value from the stroke length is measured as the slip amount of the sliding spring. The method for measuring a sliding amount of a circuit breaker according to the first aspect of the invention, wherein the operation device is operated by manually turning on the jig after the blocking portion is in an interrupted state, thereby manually turning on the device The driving force of the operating device operated by the jig is transmitted to the sliding spring through the link mechanism and the insulating rod, and the movable contact is moved from the disconnected position to the contact position to be in contact with the fixed contact to be in a conductive state. And the distance between the bottom surface of the cart on which the breaker is mounted and the insulating rod at the time of the conduction state is the reference value D1, and the manual contact of the jig is operated from the state to displace the sliding spring. The distance between the bottom surface of the cart and the insulating rod when the sliding spring is contracted is the stroke length D2, and the D2- D1 is measured by the amount of sliding contact of the sliding spring. The method for measuring a sliding amount of a circuit breaker according to the second aspect of the invention, wherein the manual-connecting the jig is a bolt, and the bolt is rotated to cause the movable lever of the operating device to be pressed to operate the operating device. The method for measuring a sliding amount of a circuit breaker according to the third aspect of the invention, wherein a screw hole is provided in a top plate portion of the casing of the operating device at a position opposite to the movable lever of the operating device, and the screw hole is inserted therein The bolt is rotated to cause the movable lever of the operating device to be pressed to operate the operating device. The method for measuring a slip amount of a circuit breaker according to any one of claims 2 to 4, further comprising a buzzer tester for informing that the movable contact is in contact with the fixed contact to be in an on state. The position at which the buzzer is sounded is the aforementioned reference value D1. The method for measuring a sliding amount of a circuit breaker according to the fifth aspect of the invention, wherein the buzzer is stopped when the buzzer is sounded. The method for measuring a sliding amount of a breaker according to the first aspect of the invention, wherein the upper end of the bolt is in a state in which a bolt for operating the operating device is in contact with a movable lever of the operating device The distance between the top plate portion of the frame of the operating device is L1, and at the same time, the bolt is rotated When the head of the bolt is lowered to the frame top portion of the operating device, the distance from the front end of the bolt upper portion to the frame top plate portion of the operating device is L2, and when the driving rod ratio of the link mechanism is a, a (L1-L2) is measured for the amount of sliding contact of the sliding spring. The method for measuring a sliding amount of a circuit breaker according to the seventh aspect of the invention, wherein a screw hole is provided in a top plate portion of the casing of the operating device at a position opposite to the movable lever of the operating device, and the screw hole is inserted therein The bolt is rotated to cause the movable lever of the operating device to be pressed to operate the operating device. A sliding contact measuring device for a circuit breaker, comprising: a blocking portion having a movable contact and a fixed contact disposed opposite to each other; and a movable contact of the blocking portion is fixed to the fixed contact An operation device for driving operation that opens and closes; a link mechanism that transmits a driving operation of the operation device to the blocking portion; and a fixing mechanism that is provided between the link mechanism and the blocking portion to provide the movable contact a sliding contact spring having a contact pressure of the contact; and a manual closing jig for moving the movable contact from the disconnected position to the contact position when the blocking portion is in an interrupted state, and the manual turning on the jig The predetermined position when the movable contact moves from the off position to the contact position is a reference value, and the distance at which the slide spring is further displaced to be held on and off is the stroke length, and the reference is set from the stroke length The value of the difference is measured as the amount of sliding contact of the sliding spring. For example, the sliding contact measuring device of the interrupter of claim 9 The driving force of the operating device operated by the manually turning on the jig is transmitted to the sliding spring through the link mechanism and the insulating rod, thereby moving the movable contact from the disconnected position to the contact position. And the contact is made in contact with the fixed contact, and the distance between the bottom surface of the cart on which the breaker is mounted and the insulating rod at the time of the conduction state is the reference value D1, and the manual connection is performed from the state. The distance between the bottom surface of the cart and the insulating rod when the sliding contact spring is contracted is a stroke length D2, and the D2-D1 is measured by the sliding contact amount of the sliding spring. . A sliding contact measuring device for a circuit breaker according to claim 10, wherein the manual closing of the jig is a bolt, and the bolt is rotated to cause the movable lever of the operating device to be pressed to operate the operating device. A sliding contact measuring device for a circuit breaker according to claim 11, wherein a screw hole is formed in a top plate portion of the casing of the operating device at a position opposite to the movable lever of the operating device, and the screw hole is inserted therein The bolt is rotated to cause the movable lever of the operating device to be pressed to operate the operating device. The sliding amount measuring device of the present invention according to any one of claims 10 to 12, wherein the buzzer is provided with a buzzer informing that the movable contact is in contact with the fixed contact and is in an on state. The position where the buzzer sounds It is the aforementioned reference value D1. The sliding amount measuring device according to the thirteenth aspect of the invention, wherein the buzzer is provided with a power supply device that is in an ON state, and is connected to the main breaker via a connecting wire. Circuit conductor.