JPH076589Y2 - Circuit breaker operation monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an operation monitoring device for circuit breakers.

[Prior Art] When a circuit breaker or a switch (which is referred to as a circuit breaker in this specification) has a failure, the effect thereof is great, and therefore it is required to be detected in advance.

By the way, it is conceivable to look at the operating state of the circuit breakers as a pre-detection element for failure.

For this reason, as a first conventional example, a sliding resistor or a reactor is prepared, and a slider is directly connected to the link portion of the circuit breaker so that the slider cooperates with the link portion to change the moving part of the circuit breaker from resistance change or reactance change. It is considered to monitor the operating state of the.

Next, a second conventional example (Japanese Utility Model Laid-Open No. 56-81438) discloses a configuration in which a bar code is provided on a moving object and the bar code is read.

Further, in the third conventional example (Japanese Patent Laid-Open No. 55-41621), a disc directly connected to the operating shaft as a stroke detection unit,
There is disclosed a configuration in which light is detected by a reflecting member provided on the outer circumference of the disc.

[Problems to be solved by the invention]

However, the structure of the first conventional example has a drawback in that the sliding portion coupling mechanism is present, so that there is a problem in mechanical durability and that the output signal is likely to contain noise.

In the method of the second conventional example, since the reflection of light is captured,
If the reflecting surface is soiled, normal detection cannot be performed, and circuit breakers with an extremely short opening and closing operation time of tens of milliseconds have the drawback that high accuracy of detection cannot be maintained due to erroneous reading. Therefore, it has not been put to practical use.

In the method of the third conventional example, two points, that is, the start and the end of the operation are detected by catching the reflection of light as in the second conventional example. How the two points move, that is, the process of the operation It is impossible to accurately determine the value without erroneous reading.

The object of the present invention is to eliminate the above-mentioned drawbacks of the first to third conventional examples.

In other words, the aim of the present invention is to eliminate a sliding part and to prevent noise from being superposed on the output signal, a device capable of obtaining high detection accuracy without the cause of erroneous reading, and a device capable of accurately determining the entire process. Is to provide.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention is one in which a disc with slits is attached to the rotary operation shaft of a circuit breaker, light emitting and receiving devices are arranged on both sides of the slit, and an optical cable is connected between the light emitting and receiving device and the monitoring room. Is.

[Action]

The movable parts of the circuit breakers are operated by operating the rotary operation shaft. Along with this, the disc also rotates. Light-emitters and light-receivers are arranged on both sides of the disk so as to correspond to the slits, and light from the light-emitters passing through the slits is given to the light-receiver and guided to the monitoring room by an optical cable.

Therefore, the rotation of the disk transmits a pulse of light to the monitoring chamber, and by monitoring this, the rotational position and speed of the disk, that is, the operating position and speed of the movable part of the circuit breaker are detected. .

〔Example〕

FIG. 1 is a simplified diagram showing an embodiment of the present invention. In the figure, 1 is a breaker, 2 is a fixed contactor, 3 is a movable contactor that contacts and separates from it, 4 and 5 are input and output terminals, 6 is an insulating operation rod for operating the movable contactor 2, and 7 is This is an operation link.
Reference numeral 8 is a rotary operation shaft, by which the operation link 7 is operated. Reference numeral 9 is an operation unit container.

10 is an auxiliary shaft connected to the rotary operation shaft 8 and penetrating the container 9,
Reference numeral 11 is a thin disk to which the auxiliary shaft 10 is fixed. A slit 12 penetrating the front and back is provided on the outer circumference of the disc 11.

A projector 13 is provided at a position where slits 12 are provided on both sides of the circular plate 11.
Also, a light receiver 14 is arranged so as to transmit and receive light through the slit 12. Optical cables 15 and 16 are connected to the projector 13 and the receiver 14, and are led to a remote electromagnetic shielded monitoring station 17.

Optical pulses are measured at the monitoring station 17, and if necessary,
An evaluator 18 is provided which can store an initial value and compares it with a measurement result and issues an alarm when the set maintenance level is reached.

The light source may be provided in the monitoring station 17.

Thus, light is emitted from a light source (not shown) and the optical cable
Evaluator via 15, projector 13, receiver 14, optical cable 16
Return to 18.

When the slit 12 of the disk 11 is on the optical axis,
Light is exchanged between the four. However, when the disc rotates and the slit 12 deviates from the optical axis, light is blocked by the disc.

Accordingly, when the rotary operation shaft 8 is rotated and the movable contact 3 is closed and opened, the disk 11 also rotates in conjunction with the shaft 8. Therefore, the slit 12 moves between the light emitting / receiving devices 13 and 14, and the light receiving device 14 can obtain an example of a light pulse.

This pulse train is observed at station 17. The evaluator 18 takes in the pulse train and determines the operation angle of the rotary operation shaft 8, that is, the extent to which the movable contactor 3 has moved. Further, by comparing the pulse train with the synchronization signal, the rotation speed of the disk 11, that is, the operation speed of the movable contactor 3 can be detected.

Therefore, the evaluator 18 stores the operating position (stroke of the movable contactor 3) and the operating speed at the beginning of manufacture of the circuit breaker, and compares the newly obtained current pulse train after operation. For example, how much (deteriorated) from the initial value can be judged visually.

Here, if you set the danger level in advance to the change value,
For example, if the speed drops to 95% of the initial value, an alarm can be issued as a precursor to a failure, which is extremely useful for predictive maintenance.

If the evaluator 18 is composed of a microprocessor, its structure is simple and convenient.

[Effect of device]

According to the present invention, (1) Since the light emitters / receivers are not arranged correspondingly on both sides of the disk attached to the rotary operation shaft and are not slid, the durability due to wear or roughness of the sliding surface can be remarkably improved. . Further, the problem of noise generation due to chattering of the sliding portion is eliminated.

(2) Since the transmission to the light emitter / receiver is performed by the optical cable, it is possible to prevent noise from being introduced on the way and causing a measurement error.

(3) Moreover, the operating process of the circuit breakers can be accurately captured by selecting the position and width of the slit.

(4) Since the disc is directly attached to the rotary operation shaft of the circuit breaker, accurate monitoring can be performed.

(5) Since light passing and blocking are simply counted as a pulse train, high detection accuracy can be obtained without causing a reading error.

(6) The operating stroke length differs depending on the type of circuit breaker, but even in that case, it can be freely handled by selecting the slit position and width. Especially useful for circuit breakers.

[Brief description of drawings]

 FIG. 1 is a simplified diagram showing an embodiment of the present invention. 1: Breaking part, 3: Movable contactor 8: Rotating operation axis, 11: Disc 12: Slit, 13: Emitter 14: Receiver, 15, 16: Optical cable 17: Monitoring room, 18: Evaluator

Claims (1)

[Scope of utility model registration request] 1. A disc directly connected to a rotary operation shaft, a plurality of slits provided on the outer periphery of the disc and penetrating the front and back of the disc, and facing the front and back of the disc and sandwiching the slit. The projector and the light receiver arranged, the optical cable connecting the monitoring room and the projector and the light receiver, and the disc which is arranged in the monitoring room and transmitted from the optical cable pass through the slit. An operation monitoring device for circuit breakers, which comprises an evaluator that compares a value obtained from an optical pulse train with a predetermined set value for operation monitoring.