JP3836895B2 - Circuit breaker switching characteristic test method and switching characteristic test measurement jig used in this method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to the opening and closing characteristics test measurement jig used for opening and closing characteristic test method and the method of circuit breaker formed by connecting a plurality of contact portions in parallel.
[0002]
[Prior art]
For example, as an air circuit breaker used in a power generation / transformation facility, there is a configuration in which an energizing contact portion and a breaking contact portion are connected in parallel in order to increase an energizing capacity.
Conventionally, in order to test the switching characteristics of the air circuit breaker having such a configuration, a test circuit as shown in FIG. 4 or FIG. 5 has been used.
[0003]
That is, in the test method using the test circuit shown in FIG. 4, in the air circuit breaker including the contact point portion 10a for energization and the contact point portion 10b for blocking connected in parallel therewith, any contact unit 10a, 10b is arranged in parallel with each other. The resistors R1 and R2 are connected to each other, and a measuring instrument 11 including a battery E and an oscilloscope OS is connected in series between the input and output terminals of the air circuit breaker.
[0004]
In this state, first, the energizing contact portion 10a is opened, and then the voltage and current waveforms when the breaking contact portion 10b is opened are recorded by the oscilloscope OS of the measuring instrument 11, and before and after the opening. Based on the subsequent voltage and current waveforms, the time from the opening of the energizing contact portion 10a to the opening of the blocking contact portion 10b is measured, and the quality of the blocking characteristics is determined by data analysis.
[0005]
Further, the test method using the test circuit shown in FIG. 5 is based on an air circuit breaker having an energizing contact portion 10a and an interrupting contact portion 10b connected in parallel to the energizing contact portion 10a and the interrupting contact portion 10b. On the other hand, here, the energizing contact portion 10a is removed, a resistance of an arbitrary value is connected in parallel to the breaking contact portion 10b, and a battery E and an oscilloscope OS are provided between the input and output terminals of the air breaker. Units 11 are connected in series.
[0006]
In this state, the voltage and current waveforms when the breaking contact portion 10b is opened are recorded by the oscilloscope OS of the measuring instrument 11, and the breaking characteristics are measured based on the voltage and current waveforms before and after the opening. The quality is determined by data analysis.
[0007]
[Problems to be solved by the invention]
However, in the test method using the test circuit shown in FIG. 4, there are many measuring instruments for recording and measuring the resistance connected in parallel to each contact part and the voltage and current applied to each contact part, and the weight. Therefore, there is a problem that the measurement preparation work and the measurement work take a lot of time and effort.
[0008]
In addition, in the test method using the test circuit shown in FIG. 5, the number of work steps for removing and assembling the contact portion is increased, which not only requires a lot of labor and time, but also involves handling heavy objects. There were problems such as generation factors.
[0009]
The present invention has been made to solve the above problem, in a circuit breaker having a plurality of contact portions which are connected in parallel, without the removal of the contact section, easily and in a short time of contact portions It is an object of the present invention to provide a circuit breaker open / close characteristic test method and a switching characteristic test jig used in this method .
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention allows one end of a stroke bar to be detachably attached to the end of a movable contact disposed opposite to the fixed contact in the container, coaxially with the movable contact. Coupling, projecting the working end of the stroke bar to the outside of the container, opening and closing a switch provided outside the container by the working end of the stroke bar moving in conjunction with the opening and closing operation of the movable contact, The output is given to a measuring device, and the open / close characteristic test of the fixed contact and the movable contact is performed.
[0011]
In addition, the present invention provides a flat mounting base that is detachably attached to a container in which a stationary contact and a movable contact are housed, as an open / close characteristic test measuring jig used in the above method, A stroke rod is provided so as to stand up through a base and be mounted coaxially with the movable contact, and a micro switch installed on the mounting base so as to face the stroke rod.
[0012]
[Action]
In the circuit breaker open / close characteristic test method of the present invention, the switch connected to the measuring device is opened / closed by a stroke bar linked to the open / close operation of the movable contact with respect to the contact part to Since the quality can be determined, it is possible to easily and easily test the open / close characteristics.
[0013]
In addition, the circuit breaker open / close characteristic test jig of the present invention is a small and lightweight jig that is easy to carry, and only needs to be detachably fixed to the movable contact by a screwing method. Measurement preparation work can be done in time.
[0014]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing a configuration example for explaining a method for testing a cutoff characteristic of an air circuit breaker, and FIG. 2 is a perspective view showing in detail a measuring jig for measuring the opening / closing operation of the contact portion in FIG. .
[0015]
In FIG. 1, 1 is a container, 2 is a fixed contact provided in the container 1, and 3 is a movable contact provided so as to be able to come into contact with and separate from the fixed contact 2, which are for energization in an air circuit breaker. It constitutes a contact part.
[0016]
When the energizing contact portion receives air from an air supply source (not shown) into the container 1 as shown by the arrow in the drawing, the movable contact 3 is separated from the fixed contact 2 by the air pressure. When the air in the container 1 is exhausted by this, the movable contact 3 comes into contact with the fixed contact 2 by a return spring (not shown).
[0017]
In such a contact point for energization, the attachment base 4 is fixed to the lid 1a of the container 1 by holding it on the stud. Then, the stroke bar 5 is inserted into the container 1 through a through hole provided in the central portion of the mounting base 4 and a processing hole or a centering hole provided in the central portion of the lid 1a, and the insertion end portion of the stroke bar 5 is movable contactor. 3 is fixed in a detachable manner by screwing.
[0018]
The stroke bar 5 has such a length that the working end portion is located above the mounting base 4 when the energizing contact portion is in a closed state, and a curved portion having an appropriate curvature is formed at the working end portion. ing.
[0019]
On the other hand, a micro switch 6 is mounted on the mounting base 4 to operate when the working end of the stroke bar 5 that moves in conjunction with the opening / closing operation of the movable contact 3 comes into contact. Further, it is connected to a measuring instrument (not shown) via a measuring line 8.
[0020]
Next, a method for testing the cutoff characteristics of the air circuit breaker using such a measuring jig will be described.
Now, it is assumed that the energizing contact point and the breaking contact point of the air circuit breaker are connected in parallel, and the disconnecting device is connected in series to the air circuit breaker. When an opening command is issued in such a state, air flows into the container 1 of the energizing contact portion from an air supply source (not shown), and the movable contact 3 is separated from the fixed contact 2 by air pressure. Move in the direction.
[0021]
Then, the stroke bar 5 is also moved in conjunction with the movement of the movable contact 3, and the micro switch 6 is operated by the pressing force of the action end. When the contact output of the micro switch 6 is input to a measuring device (not shown) via the measuring line 8, the measuring device determines the operation of the micro switch 6 and issues a contact opening command before the micro switch 6 operates. Time measurement and recording are performed.
[0022]
Therefore, it is possible to determine whether the breaking characteristics of the energizing contact portion and the breaking contact portion are good or not by managing the time until the breaking contact portion is opened after the energizing contact portion is opened.
[0023]
Incidentally, as the cutoff characteristics of the energizing contact part and the breaking contact part of the air circuit breaker, as shown in FIG. 3, the time from opening the energizing contact part to opening the breaking contact part is 20 ms or more. In addition, whether the breaking characteristic is good or not is determined depending on whether or not the opening contact portion is within a time period of 55 ms after the opening command is issued.
[0024]
In the above description, the switching characteristics test of the energizing contact portion of the air circuit breaker for one phase has been described. However, for the other two phases as well, the measuring jigs are used to measure the energizing contact portion of each phase. Opening and closing characteristics tests can be performed simultaneously.
[0025]
As described above, in this embodiment, the contact portion of the air circuit breaker simply by opening / closing the microswitch 6 incorporated in the test circuit by the stroke bar 5 interlocked with the opening / closing operation of the movable contactor. It is possible to determine whether or not the opening / closing characteristics are good.
[0026]
Therefore, it is not necessary to prepare a large number of heavy measuring instruments as in the past or to remove the contact point, and the switching characteristics can be easily and easily tested with a small and lightweight measuring jig that is easy to carry. be able to.
[0027]
Moreover, it is only necessary to insert the stroke rod into the container using the processing hole or the centering hole provided in the container, and to detachably fix the movable contact to the movable contact by a screwing method, and to measure a plurality of contact portions simultaneously. Therefore, the measurement preparation work can be performed in a short time, and the man-hours for measurement work and data analysis can be greatly reduced.
[0028]
Furthermore, since there is no need to disassemble and assemble the contact part of the air circuit breaker, there are no work mistakes and heavy objects are handled, and the work environment can be improved.
In the above embodiment, the switching characteristic test of the energizing contact part of the air circuit breaker was described. However, the same applies to other circuit breakers such as a gas circuit breaker in which a plurality of contact parts are connected in parallel. Applicable.
[0029]
In the above embodiment, the microswitch is used as the switch that opens and closes in conjunction with the opening and closing operation of the movable contact. However, the present invention is not limited to this and can detect the opening and closing operation of the movable contact. If there are other switches, other switches may be used.
[0030]
【The invention's effect】
As described above, according to the present invention, in the circuit breaker having a plurality of contact portions connected in parallel, the contact portion cutting characteristics can be easily and quickly tested without removing the contact portions. It is possible to provide a circuit breaker open / close characteristic test method that can be used, and an open / close characteristic test jig used in this method .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a contact portion attached with a measuring jig for explaining an embodiment of a circuit breaker switching characteristic test method according to the present invention.
FIG. 2 is a perspective view showing details of a measuring jig in the embodiment.
FIG. 3 is a time chart at the time of opening each contact portion of the air circuit breaker in the same embodiment.
FIG. 4 is a circuit diagram for explaining a conventional switching characteristic test method for an air circuit breaker.
FIG. 5 is a circuit diagram for explaining a method for testing the switching characteristics of another conventional air circuit breaker.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Container, 1a ... Cover body, 2 ... Fixed contact, 3 ... Movable contact, 4 ... Mounting base, 5 ... Stroke bar, 6 ... Micro switch, 7 ... Terminal, 8 ... ... measurement line.

Claims (3)

One end of a stroke bar is detachably coupled coaxially with the movable contact to the end of the movable contact disposed opposite the fixed contact in the container, and the working end of the stroke bar is connected to the outside of the container The switch provided outside the container is opened and closed by the working end of the stroke bar that moves in conjunction with the opening and closing operation of the movable contact, and the output is given to a measuring instrument to An open / close characteristic test method for the circuit breaker, wherein the open / close characteristic test of the movable contact is performed. A flat mounting base that is detachably attached to a container in which a fixed contact and a movable contact are housed, and a vertical installation base that passes through the mounting base and is mounted coaxially with the movable contact. A circuit breaker open / close characteristic test and measurement jig comprising: a stroke bar formed as described above; and a micro switch installed on the mounting base so as to face the stroke bar. 3. The circuit breaker open / close characteristic test measuring jig according to claim 2, wherein a curved portion is formed at an end of the stroke bar.

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