JPH0762971B2 - Circuit breaker abnormal operation monitoring device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormal operation monitoring device for a circuit breaker, and more particularly to an abnormal operation monitoring device for detecting the presence or absence of an abnormality in an operating system.

[Background of the Invention]

In general, a circuit breaker operates a closing drive to drive a closing drive main contact by a closing signal, and a tripping signal to actuate a tripping drive to trip a breaking main contact. It is configured.

However, if an abnormality occurs due to galling or cutting of the mechanism in the process of these operations, it is necessary to detect the abnormality at an early stage, and an abnormality monitoring device is used for this purpose.

The conventional abnormality monitoring device is configured to measure the time from when a closing command is given to when the main contact of the breaking portion is contacted, and to determine that the difference is a predetermined value or more as an abnormality. . For this reason, an abnormality monitoring device must be connected between the terminals of the circuit breaker for measurement, power failure in the system, and in the case of tank type, it must be connected to the upper terminal of the bushing. It was working.

[Object of the Invention]

An object of the present invention is to provide a circuit breaker abnormality monitoring device that can easily detect an abnormality in the operating system without adversely affecting the system.

[Outline of Invention]

The present invention relates to a first auxiliary auxiliary contact for monitoring which is closed at the end of the operation mechanism in conjunction with the closing operation of the operation mechanism and is opened in the initial stage in association with the trip operation of the operation mechanism, and in conjunction with the operation operation of the operation mechanism. A second monitoring auxiliary contact that opens at the beginning and closes at the end in conjunction with the tripping operation of the operating mechanism, and a second monitoring auxiliary contact from when the excitation command is input to the closing coil until the second monitoring auxiliary contact opens. The first time after the excitation command is input to the trip coil for a second time from the input of the excitation command to the closing coil to the closing of the first auxiliary auxiliary contact for the first time.
The third time until the auxiliary monitoring contact is opened, the fourth time from the input of the excitation command to the trip coil until the second auxiliary auxiliary contact is closed, the second time and the first time. The measuring means for determining at least one of the fifth time, which is the time difference, and the sixth time, which is the difference between the fourth time and the third time, and the time calculated by this measuring means, Comparison means for comparing with a reference value is provided, and normality or abnormality of the operating system is detected based on this comparison means.

Example of Invention

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a tank type gas circuit breaker to which the present invention is applied.

A blocking unit is configured in the tank 1 filled with arc-extinguishing gas,
This interruption part has a main contact 4 consisting of a fixed contact 2 and a movable contact 3. The movable contactor 3 is connected to the insulating operation rod 5, and the other end of the insulating operation rod 5 is led out of the tank 1 via the link mechanism 6 and connected to the operation rod 7. The movable contact 3 is attached to the operation rod 7 and the fixed contact 2
The closing spring 8 that closes the circuit is connected to the operation piston 11 that receives a pressure to open the movable contact 3. The operating piston 11 is slidably arranged in the cylinder 9. By supplying compressed air in the container 13 into the charging chamber A when a command is given to the trip coil 12, the operating piston 11 is moved. Is driven downward in the open circuit direction. Operating piston
When 11 reaches the open position, it is locked and held by the latch mechanism 25. This latch mechanism 25 has a closing coil 26
When the command is given to, the lock of the operating piston 11 is unlocked.
A movable contact 15, which is a short-circuit conductor, is connected in the middle of the operation rod 7, and a pair of fixed contacts 16a, 16b, 17a, 17b are provided on both sides of the movable contact 15, respectively. The pair of fixed contacts 16a, 16b constitutes a first monitoring auxiliary contact, and the movable contact 15 and the other pair of fixed contacts 17a, 17b constitute a second monitoring auxiliary contact.

Next, the opening / closing operation will be briefly described. The drawing shows the closed state. When a command is given to the trip coil 12, compressed air from the container 13 is supplied into the charging chamber A, and the operating piston
Drive 11 down. The operation of the operation piston 11 drives the movable contactor 3 via the operation rod 7 or the like to separate from the fixed contactor 2, and the main contact 4 opens. At the initial stage of this tripping operation, the movable contact 15 is separated from the fixed contacts 16a, 16b, and the first auxiliary auxiliary contact is opened. At the end of this tripping operation, the movable contact 15 short-circuits the fixed contacts 17a, 17b. Then, the second auxiliary contact for monitoring is closed, and then the operating piston 11 is locked by the latch mechanism 25 and the tripped state is maintained.

On the other hand, the closing operation is performed by giving a command to the closing coil 26 to unlock the operating piston 11 by the latch mechanism 25, and by the restoring force of the closing spring 8 stored during the tripping operation. Of course, at this time, the compressed air in the charging chamber A has already been discharged and does not act on the operation piston 11 as a reaction force of the closing spring 8. At the beginning of this closing operation, the bridge between the fixed contacts 17a, 17b is released and the second auxiliary auxiliary contact is opened, and at the end of the closing operation, the fixed contacts 16a, 16b are bridged and the first contact is made.
The monitoring auxiliary contact is closed, and then the movable contactor 3 contacts the fixed contactor 2 and enters the illustrated closed state.

The first and second monitoring auxiliary contacts are configured so that they can be overstroked while maintaining contact with the movable contact 15 so as to be opened and closed in the above-described relationship. Further, as can be seen from the above description, the first auxiliary auxiliary contact is composed of the movable contact 15 and the fixed contacts 16a, 16b, and the second auxiliary auxiliary contact is the movable contact 15 and the fixed contact 17a, 17b. 17b constitutes the b contact.

The operation characteristics of the first and second monitoring auxiliary contacts (a and b contacts) and the main contact 4 are shown in FIG.

From the excitation of the closing coil 26 to the opening of the b contact, that is, the first time T _C1 until the movable contact 15 separates from the fixed contacts 17a and 17b, and from the excitation of the closing coil 26 to the closing of the a contact, that is, The second time T _C2 until the movable contact 15 contacts the fixed contacts 16a, 16b can be obtained by applying a voltage to the contacts 16a, 16b and the contacts 17a, 17b and using the timer in combination. . Similarly, the trip coil
Third time from the excitation of 12 to the opening of contact a T _O1
Then, the fourth time T _O2 from the excitation of the trip coil 12 to the closing of the b contact can be obtained. Also, from this information, the fifth time T _C3 (=
T _C2- T _C1 ) and the sixth time T _O3 (T _O2- T _O1 ) can also be obtained.

Each of these times is almost constant if there is no abnormality in the operating system, but changes if there is an abnormality, so normality and abnormality can be detected by monitoring each time. An example of the monitoring device is shown in FIG.

The electric signal of T _O , T _C is amplified by the amplifier 30, the minute waveform is removed by the next comparator 31, and the input electric signal is read as time by the pulse signal from the clock 32,
It is output by the decimal counter 33. In addition, a normal value is set in the digital switch 35 in advance, and the normal value and abnormality can be detected by comparing and outputting the set value with the comparator 34.

Moreover, the above-mentioned first to first operation times of the respective monitoring auxiliary contacts
Since the sixth time is measured based on the excitation command signal of the closing coil 26 or the trip coil 12, it is possible to detect an operation delay element that appears in the initial operation such as when the play of the pin connecting portion increases. it can.

In the above-mentioned embodiment, each monitoring auxiliary contact is constructed around the movable contact 15 connected to the operation rod 7, but the invention is not limited to this configuration. For example, in order to obtain a switching signal as a signal to the control circuit of the circuit breaker, as shown in FIG.
Eighteen are generally made up. Therefore, the auxiliary contact 18 may be used as a monitoring auxiliary contact, and the monitoring device described in FIG. 3 or the like may be connected to the auxiliary contact 18. Further, as the time element to be monitored by the monitoring device, both the information at the time of making and the time of making the trip are obtained, but the information may be obtained automatically only when either one of the operations is performed. Further, in carrying out the present invention, the operation mechanism for driving the movable contactor 3 in response to a closing or tripping command is not limited to the example shown in the drawing, and various structures can be adopted.

〔The invention's effect〕

As described above, according to the present invention, the first and second monitoring auxiliary contacts that are interlocked with the operating mechanism of the circuit breaker are provided, and the operating times of these monitoring auxiliary contacts are measured. Since monitoring is performed, it is possible to detect normality or abnormality of the operating force transmission system when the circuit breaker operates, it does not adversely affect the system for detection, and it can be permanently installed with a simple configuration. Because of this, it is possible to eliminate the large-scale work required in the past. Moreover, since the operation time of the auxiliary monitoring contact is measured based on the excitation command of the closing coil or the trip coil, the operation delay element appearing in the initial operation, such as when the play of the pin connecting portion is increased, is set. It can also be detected.

[Brief description of drawings]

FIG. 1 is a sectional view of an abnormal operation monitoring device for a circuit breaker according to an embodiment of the present invention, FIG. 2 is an operation characteristic diagram of each part in FIG. 1, and FIG. 3 is a circuit diagram showing an example of an operating time monitoring device. Is. 2 ... Fixed contact, 3 ... Movable contact, 12 ... Tripping coil, 15 ... Moving contact, 16a, 16b, 17a, 17b ... Fixed contact, 26 ...
… A closing coil.

Continuation of the front page (56) Reference JP 54-152169 (JP, A) JP 54-139044 (JP, A) JP 54-145967 (JP, A) JP 55-56318 (JP , A)

Claims (1)

[Claims] 1. A pair of fixed and movable contactors that can be brought into and out of contact with each other, an operating mechanism mechanically connected to the movable contactors, a closing drive device and a tripping drive device, a closing coil, and A pull-out coil, and based on the input of an excitation command to the closing coil, the closing drive device closes and drives the movable contactor through the operating mechanism, and inputs an excitation command to the trip coil. In the circuit breaker configured to trip and drive the movable contactor through the operating mechanism by the trip drive device based on the above, the closing operation is performed at the end of the operation in conjunction with the closing operation of the operating mechanism. The first auxiliary auxiliary contact for monitoring, which opens in the initial stage in conjunction with the tripping action of the mechanism, and opens in the initial stage in conjunction with the closing action of the operating mechanism, and its final stage in conjunction with the tripping action of the operating mechanism. Closed to The second monitoring auxiliary contact and the closing coil, the first time from the input of the excitation command to the opening of the second auxiliary monitoring contact, the first time after the input of the excitation command to the closing coil The second auxiliary coil contact is closed for a second time, and the third auxiliary coil contact is opened for a third time after the excitation command is input to the trip coil. Second after input
A fourth time until the auxiliary auxiliary contact for closing the second time, a fifth time that is the difference between the second time and the first time, and a sixth time that is the difference between the fourth time and the third time. A measuring means for obtaining at least one of the times and a comparing means for comparing the time obtained by the measuring means with a reference value are provided, and the presence or absence of abnormality of the operating system is detected based on the comparison result. A device for monitoring abnormal operation of a circuit breaker, which is characterized in that