JP2020102303A - Vacuum circuit breaker and abnormality monitoring method for vacuum circuit breaker - Google Patents

Abstract

To provide a vacuum circuit breaker capable of grasping contact wear of the vacuum circuit breaker, abnormality in an operation mechanism part, etc., in simple configuration and also improving reliability.SOLUTION: A vacuum circuit breaker is characterized in comprising: a main circuit opening/closing part including a vacuum valve including a contact, and an insulation frame insulating the vacuum valve; an operation mechanism part including an operation mechanism which operates the vacuum valve, and an operation mechanism part case covering the operation mechanism; a link mechanism part including a link mechanism which links the operation mechanism with the vacuum valve, and a link mechanism part case covering the link mechanism and installed in a lower part of the insulation frame and the operation mechanism part case; and a position detector which detects a distance between the operation mechanism part case and the insulation frame.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vacuum circuit breaker and a vacuum circuit breaker abnormality monitoring method.

As a background art of this technical field, there is JP-A-2004-158302 (Patent Document 1). This publication describes monitoring the amount of wear of electrodes inside the vacuum valve. In particular, a contact gauge that contacts and separates from each other in a vacuum and a wipe spring that applies contact pressure to the contact gauge are provided, and the strain amount of the operating rod is detected from the strain gauge provided on the operating rod that operates the contactor. A vacuum valve state monitoring method including a strain detecting step, a converting step of converting a strain amount into a state amount, and a notifying step of notifying the state amount is described. A vacuum valve state monitor provided on the operation rod, including a strain gauge for detecting the strain amount of the operation rod, a conversion device for converting the strain amount into the state quantity of the vacuum valve, and an informing device for informing the state quantity The device is described (see summary).

JP, 2004-158302, A

The vacuum valve state monitoring method and the vacuum valve state monitoring device described in Patent Document 1 detect the state of the vacuum valve from the strain amount of the strain gauge provided on the operating rod and monitor the amount of electrode wear. is there.

However, in the vacuum valve state monitoring method and the vacuum valve state monitoring device described in Patent Document 1, since the strain gauge is fixed to the operation rod that interlocks with the opening/closing operation of the vacuum valve, the opening/closing operation of the vacuum valve may be repeated. , The lead wire connected to the strain gauge may be broken.

Further, since the strain gauge measures a change in electric resistance during strain, a bridge circuit is used to replace the change in electric resistance with a change in voltage. However, since the magnitude of the voltage is as small as microvolt (it is very small), it is generally necessary to amplify the voltage using an amplifier, and noise countermeasures are required.

Therefore, the present invention is capable of grasping the contact (electrode) wear (deterioration) of the vacuum circuit breaker and the abnormality (deterioration) of the operation mechanism section with a simple configuration, and also improving the reliability. Another object of the present invention is to provide an abnormality monitoring method for a vacuum circuit breaker.

In order to solve the above problems, a vacuum circuit breaker according to the present invention includes a main circuit opening/closing unit having a vacuum valve having contacts, an insulating frame for insulating the vacuum valve, an operating mechanism for operating the vacuum valve, and an operating mechanism. An operating mechanism section having an operating mechanism case covering the link mechanism, a link mechanism for interlocking the operating mechanism and the vacuum valve, and a link mechanism section case which covers the link mechanism and is installed below the insulating frame and the operating mechanism section case. And a position detector that detects the distance between the operation mechanism case and the insulating frame.

The vacuum circuit breaker abnormality monitoring method of the present invention includes a main circuit opening/closing unit having a vacuum valve having contacts and an insulating frame for insulating the vacuum valve, an operating mechanism for operating the vacuum valve, and an operating mechanism. An operating mechanism section having a covering operation mechanism case, a link mechanism for interlocking the operating mechanism and a vacuum valve, and a link mechanism section case covering the link mechanism and installed under the insulating frame and the operating mechanism case. And a link mechanism section having a., a vacuum circuit breaker having an abnormality, and detecting a distance between the operation mechanism section case and the insulating frame to detect the distance between the operation mechanism section case and the insulating frame. The difference between the ON state and OFF state of the vacuum valve in the distance and the difference between the ON state and the OFF state of the vacuum valve in the distance between the operating mechanism case and the insulating frame in the normal state before the contact is consumed. , Are compared.

ADVANTAGE OF THE INVENTION According to this invention, the contact (electrode) wear (deterioration) of a vacuum circuit breaker and the abnormality (deterioration) of an operation mechanism part can be grasped|ascertained by a simple structure, and the vacuum circuit breaker which can also improve reliability. It is also possible to provide a method for monitoring a vacuum circuit breaker for abnormalities.

The problems, configurations and effects other than those described above will be clarified by the following description of the embodiments.

It is a side view explaining the vacuum circuit breaker (disconnected state) of Example 1. It is a side view explaining the vacuum circuit breaker (off state) of Example 2. It is a side view explaining the vacuum circuit breaker (off state) of Example 3. It is explanatory drawing explaining the relationship between the bending amount and contact wear in the vacuum circuit breaker of a present Example. FIG. 3 is an explanatory diagram illustrating a position detector used in the first embodiment.

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the same or similar configurations are denoted by the same reference numerals, and when the description overlaps, the description may be omitted.

The vacuum circuit breaker and the method for monitoring abnormality of the vacuum circuit breaker described in the present embodiment include, for example, the amount of flexure of the housing when the vacuum circuit breaker is in the “on” state and the housing when the vacuum circuit breaker is in the “off” state. The abnormality of the vacuum circuit breaker is monitored from the difference between the amount of deflection and the amount of deflection.

FIG. 1 is a side view illustrating a vacuum circuit breaker (off state) according to the first embodiment.

The vacuum circuit breaker has a main circuit opening/closing section 1 shown on the left side of the figure, an operation mechanism section 2 shown on the right side of the figure, and a link mechanism section 3 shown on the lower side of the figure.

An insulating frame 4 is formed in the main circuit opening/closing section 1. The operation mechanism section 2 and the link mechanism section 3 are covered with a casing frame 5 having a ground potential. The insulating frame 4 of the main circuit opening/closing unit 1 is fixed to either the link mechanism unit case 6 or the operation mechanism unit case 7, or both of them.

In this embodiment, the insulating frame 4 of the main circuit opening/closing section 1 is fixed to the link mechanism case 6.

That is, in the vacuum circuit breaker described in the present embodiment, the main circuit opening/closing section 1 and the operation mechanism section 2 for operating the main circuit opening/closing section 1 are connected via the link mechanism section 3.

The vacuum circuit breaker described in this embodiment is a one-phase circuit breaker, but may be a three-phase circuit breaker. In the case of a three-phase circuit breaker, the main circuit switching units 1 are arranged side by side in the depth direction of FIG.

Further, the operating mechanism section 2 described in the present embodiment is an electromagnetic operation type operating device that uses the permanent magnet 15 and the coil 16, but instead of the permanent magnet 15 and the coil 16, a closing spring is used. Alternatively, the closing spring and the breaking spring may each be a spring-operated operating device that is held by a latch mechanism.

The main circuit opening/closing unit 1 electrically connects the fixed-side conductor 8, a vacuum valve 9 having a pair of contacts that can be opened/closed (disengaged), the movable-side conductor 10, and the vacuum valve 9 and the movable-side conductor 10. A flexible conductor 11, an insulating rod 12 for vertically moving the movable side of the vacuum valve 9, a contact pressure spring 13 for applying a contact load to a contact (electrode) of the vacuum valve 9, and a lever connection fitting for pushing up the contact pressure spring 13. And an insulating frame 4 for electrically insulating these (main circuit switchgear including the vacuum valve 9) from the operation mechanism section 2 and the link mechanism section 3.

The operation mechanism section 2 has an operation mechanism for operating the vacuum valve 9 and the like. The operation mechanism includes a permanent magnet 15 and a coil 16 (or a closing spring instead of these), a permanent magnet 15 and a coil 16 (or Instead, it has an operating device case 17 that houses a closing spring), a shutoff spring 18 that opens the contacts of the vacuum valve 9, and a drive rod 19 that is arranged on these axes. Then, these (operation mechanism) are covered with the operation mechanism case 7.

The link mechanism unit 3 has a link mechanism for interlocking the operation mechanism and the vacuum valve 9 and the like. The link mechanism has a shaft 20 supported by the link mechanism unit case 6 and one end fixed to the shaft 20 and the other end. A first lever 22 connected to the lever connection fitting 14 of the main circuit opening/closing part 1 by a first pin 21, and one end fixed to the shaft 20, and the other end to the drive rod 19 of the operation mechanism part 2 second. A second lever 24 connected by a pin 23. These (link mechanism) are covered with the link mechanism case 6.

The link mechanism case 6 is installed below the insulating frame 4 and the operation mechanism case 7.

In addition, the vacuum circuit breaker described in the present embodiment is particularly a vacuum for electric railway, which has a possibility that the switching operation is repeated frequently (current interruption is repeated frequently) and the life is shortened. It is preferably applied to a circuit breaker.

As described above, the vertical linear movement of the drive rod 19 of the operation mechanism section 2 is transmitted to the movable side of the vacuum valve 9 via the second lever 24 and the first lever 22, and the contact point of the vacuum valve 9 is changed. It is opened and closed.

In this embodiment, the position detector 30 is installed on the upper part of the operation mechanism case 7, and the movable rod 31 of the position detector 30 is connected to the side surface of the insulating frame 4 on the operation mechanism 2 side.

The position detector 30 detects the distance between the operation mechanism case 7 and the side surface of the insulating frame 4 on the operation mechanism 2 side.

In this embodiment, by installing the position detector 30 on the upper part of the operation mechanism unit case 7, the position detector 30 can be easily installed and the operation mechanism unit case 7 and the operation mechanism unit of the insulating frame 4 can be installed. The distance between the upper side surface on the two side can be detected.

In the following description, the "distance between the operating mechanism case 7 and the side surface of the insulating frame 4 on the operating mechanism 2 side" will be referred to as the "distance between the operating mechanism case 7 and the insulating frame 4". There is a case.

A vacuum circuit breaker abnormality monitoring method for monitoring a vacuum circuit breaker abnormality described in the present embodiment includes a main circuit opening/closing unit 1 having a vacuum valve 9 having a contact and an insulating frame 4 for insulating the vacuum valve 9. An operating mechanism 2 having an operating mechanism for operating the vacuum valve 9 and an operating mechanism case 7 covering the operating mechanism; a link mechanism for interlocking the operating mechanism and the vacuum valve 9; A method for monitoring an abnormality of a vacuum circuit breaker having a link mechanism section 3 having a frame 4 and a link mechanism case 6 installed below the operation mechanism case 7.

Then, the abnormality monitoring method of the vacuum circuit breaker described in the present embodiment detects the distance between the operation mechanism unit case 7 and the insulating frame 4, and detects the distance between the operation mechanism unit case 7 and the insulating frame 4. The difference between the ON state and the OFF state of the vacuum valve 9 and the ON state and the OFF state of the vacuum valve 9 at the distance between the operating mechanism case 4 and the insulating frame 4 in the normal state before the contacts are consumed Compare with the difference.

FIG. 5 is an explanatory diagram illustrating the position detector used in the first embodiment. The position detector 30 described in the present embodiment is a linear motion sensor, and includes a movable rod 31, a resistor 34, a power supply 35, and a voltage. It has a total of 36.

Since one end of the movable rod 31 is connected to the side surface of the insulating frame 4 on the operating mechanism 2 side, the distance between the operating mechanism case 7 and the insulating frame 4 can be measured. Particularly, when the distance between the operation mechanism case 7 and the insulating frame 4 changes, the changed distance between the operation mechanism case 7 and the insulating frame 4 can be measured.

When the distance between the operation mechanism case 7 and the insulating frame 4 changes, the movable rod 31 is displaced, that is, the conductive member installed at the other end of the movable rod 31 is displaced, and the displacement is generated by the power source 35. A voltage change is detected by a voltmeter 36 via a resistor 34 connected to. Then, the detected voltage is transmitted to the comparison device 40.

The comparison device 40 converts the transmitted voltage into a distance and calculates the changed distance between the operation mechanism case 7 and the insulating frame 4. The distance between the operating mechanism unit case 7 and the insulating frame 4 when the vacuum circuit breaker is in the "OFF state" and the distance between the operating mechanism unit case 7 and the insulating frame 4 when the vacuum circuit breaker is in the "ON state" And the difference (detection value) between and is calculated.

In addition, the comparison device 40 obtains the distance between the operating mechanism case 7 and the insulating frame 4 in a normal state, which is acquired in advance and before the contacts are exhausted, and the vacuum circuit breaker. Acquires (calculates) the difference (normal value) between the distance between the operation mechanism case 7 and the insulating frame 4 in the “ON state”.

Then, the comparison device 40 compares the detected value with the normal value.

That is, even when the contact is in a normal state before it is consumed, the operation mechanism case 7 and the insulating frame are referred to when the vacuum circuit breaker is in the "on state" and when the vacuum circuit breaker is in the "off state". The distance to 4 changes, and a difference occurs in the distance. Since the contact pressure spring 13 applies a contact load to the contact point of the vacuum valve 9, stress is generated in the link mechanism unit case 6 to bend, and the distance between the operation mechanism unit case 7 and the insulating frame 4 is a vacuum circuit breaker. Is shorter when compared to when the vacuum circuit breaker is in the "off" state.

As described above, even in the normal state before the contacts are consumed, the distance between the operation mechanism case 7 and the insulating frame 4 changes between the "on state" and the "off state" ( There is a difference in this distance).

Since the contact pressure spring 13 applies a contact load to the contact point of the vacuum valve 9, when the contact point of the vacuum valve 9 is exhausted due to repeated current interruptions, the contact load due to the contact pressure spring 13 decreases. Since the stress applied to the link mechanism case 6 is reduced due to the reduction of the contact load, the bending is also reduced.

As a result, the difference (detection value) between the "ON state (closed)" and the "OFF state (open)" in the distance between the operation mechanism case 7 and the insulating frame 4 causes the contact point of the vacuum valve 9 to wear. It is smaller than the previous normal value.

As described above, in the present embodiment, the distance between the operation mechanism case 7 and the insulating frame 4 changes even if the contact is in a normal state before it is consumed (the difference in the distance is Further, based on the knowledge that the current occurs, when the contact is consumed by repeating the current interruption, the distance between the operation mechanism case 7 and the insulating frame 4 is “ON state (closed)” and “OFF state (open)”. Is based on the finding that the difference (detection value) with respect to the contact point is smaller than the normal value before the contact is consumed.

That is, the vacuum valve 9 is in the "on state (closed)" and the vacuum valve 9 is in the "off state (open)" at the distance between the operating mechanism case 7 and the insulating frame 4 in a normal state before the contacts are consumed. And a difference (normal value) between the operating mechanism unit case 7 and the insulating frame 4 that has been changed, the vacuum valve 9 is in the “on state (closed)” and the vacuum valve 9 is in the “off state (open state). )” and the difference (detected value) is obtained, and the normal value and the detected value are compared, the detected value is smaller than the normal value (when the detected value is smaller than a predetermined judgment value (normal value)). Can be determined as deterioration of contact wear.

FIG. 4 is an explanatory diagram for explaining the relationship between the amount of flexure and contact wear of the vacuum circuit breaker of this embodiment. The relationship between the amount of flexure of the link mechanism case 6 and the contact wear of the vacuum valve 9 in the vacuum circuit breaker. Where the vertical axis is the contact wear and the horizontal axis is the deflection amount.

As shown in FIG. 4, contact wear increases and the amount of deflection decreases. That is, the decrease in the amount of bending means the progress (arrow) of contact wear “deterioration”.

In the relationship between the amount of flexure and contact wear, it is possible to define that a predetermined amount of contact wear or more is "abnormal" and that the amount of flexure that is equal to or greater than the predetermined contact wear is "abnormal". .. That is, the normal value can be used as the determination value.

Then, the comparison device 40 compares the detected value with the determination value (normal value), grasps the contact wear of the vacuum circuit breaker, and monitors (determines) whether there is an abnormality in the vacuum circuit breaker. When it is determined that the vacuum circuit breaker has an abnormality, the vacuum circuit breaker is turned on (closed).

According to the present embodiment, contact wear can be determined from the amount of bending, and the life of the vacuum valve can be determined. Then, it is possible to monitor whether or not there is an abnormality in the vacuum circuit breaker.

Then, it is possible to grasp the contact wear of the vacuum circuit breaker and the abnormality of the operation mechanism section with a simple configuration, and it is possible to improve the reliability.

Further, according to the present embodiment, it is possible to realize a simplification of the measuring device without using a large noise measure, using a fine measuring device.

Furthermore, according to the present embodiment, the position detector 30 and the comparison device 40 can be installed even in the already operating vacuum circuit breaker, and the contact wear and operating mechanism of the already operating vacuum circuit breaker can be set. It is possible to monitor abnormalities in the department.

FIG. 2 is a side view illustrating a vacuum circuit breaker (off state) according to the second embodiment.

In this embodiment, the insulator 32 is formed at least at the tip of the movable rod 31 of the position detector 30 shown in the first embodiment. The insulator 32 is connected to the side surface of the insulating frame 4 on the side of the operation mechanism section 2. Other configurations are similar to those of the first embodiment, and the description of the same parts as those of the first embodiment will be omitted.

In addition, it is preferable that the portion of the movable rod 31 other than the conductive member is formed of the insulator 32.

According to the present embodiment, by forming the insulator 32 on at least the tip of the movable rod 31 of the position detector 30, the resistor 34 of the position detector 30, the fixed side conductor 8 and the vacuum valve 9 are connected. Since the insulated distance between them becomes long, the insulating performance can be improved.

FIG. 3 is a side view illustrating a vacuum circuit breaker (off state) according to the third embodiment.

In this embodiment, a spring 33 is installed around the movable rod 31 of the position detector 30 shown in the first embodiment so that the movable rod 31 is constantly pressed against the side surface of the insulating frame 4 on the side of the operation mechanism section 2. To be done. Naturally, the spring 33 does not hinder the measurement of the distance between the operation mechanism case 7 and the insulating frame 4. Other configurations are similar to those of the first embodiment, and the description of the same parts as those of the first embodiment will be omitted.

According to the present embodiment, it is not necessary to fix the tip of the movable rod 31 of the position detector 30 and the side surface of the insulating frame 4 on the side of the operation mechanism section 2, and the position detector 30 can be easily installed. ..

It should be noted that the present invention is not limited to the above-described embodiments, but includes various modifications. For example, the above-described embodiments have been 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 the configurations described. Further, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment.

DESCRIPTION OF SYMBOLS 1... Main circuit opening/closing part, 2... Operation mechanism part, 3... Link mechanism part, 4... Insulation frame, 5... Enclosure frame, 6... Link mechanism part case, 7... Operation mechanism part case, 8... Fixed side conductor, 9 ...Vacuum valve, 10...movable side conductor, 11...flexible conductor, 12...insulating rod, 13...pressure contact spring, 14...lever connecting fitting, 15...permanent magnet, 16...coil, 17...actuator case, 18...interruption Spring, 19... Drive rod, 20... Shaft, 21... First pin, 22... First lever, 23... Second pin, 24... Second lever, 30... Position detector, 31... Movable rod, 32... Insulator, 33... Spring, 34... Resistor, 35... Power supply, 36... Voltmeter, 40... Comparison device

Claims (8)

A main circuit opening/closing section having a vacuum valve having contacts and an insulating frame for insulating the vacuum valve;
An operating mechanism unit having an operating mechanism for operating the vacuum valve, and an operating mechanism case covering the operating mechanism,
A link mechanism unit having a link mechanism that interlocks the operation mechanism and the vacuum valve, and a link mechanism unit case that covers the link mechanism and is installed below the insulating frame and the operation mechanism unit case,
A position detector that detects a distance between the operation mechanism case and the insulating frame,
A vacuum circuit breaker characterized by having. The vacuum circuit breaker according to claim 1, wherein the position detector detects a distance between the operation mechanism case and a side surface of the insulating frame on the operation mechanism side. The vacuum circuit breaker according to claim 1, wherein the position detector is installed in the operation mechanism unit case. The difference between the ON state and the OFF state of the vacuum valve in the distance between the operating mechanism case and the insulating frame, and the operating mechanism case and the insulating frame in a normal state before the contacts are consumed. The vacuum circuit breaker according to claim 1, further comprising a comparison device that compares a difference between an ON state and an OFF state of the vacuum valve at a distance between them. The vacuum circuit breaker according to claim 1, wherein the position detector detects a change in a distance between the operation mechanism case and the insulating frame by displacement of a movable rod. The vacuum interrupter according to claim 5, wherein at least the tip of the movable rod of the position detector is an insulator. 7. The vacuum circuit breaker according to claim 5, wherein a spring is installed around the movable rod in the position detector. An operation mechanism including a main circuit opening/closing section having a vacuum valve having a contact point and an insulating frame for insulating the vacuum valve, an operation mechanism for operating the vacuum valve, and an operation mechanism section case for covering the operation mechanism. Section, a link mechanism for interlocking the operation mechanism and the vacuum valve, and a link mechanism section case that covers the link mechanism and is installed below the insulating frame and the operation mechanism section case. And a vacuum circuit breaker abnormality monitoring method for monitoring a vacuum circuit breaker abnormality, comprising:
Detecting the distance between the operating mechanism case and the insulating frame,
The difference between the ON state and the OFF state of the vacuum valve in the distance between the operation mechanism unit case and the insulating frame, and the operation mechanism unit case and the insulating frame in a normal state before the contacts are consumed. A method for monitoring an abnormality of a vacuum circuit breaker, characterized by comparing the difference between the ON state and the OFF state of the vacuum valve in the distance between the two.

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