JPS61203820A - Abnormal operation monitor for breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application 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]

Generally, in a circuit breaker, a closing signal operates a closing drive device to close the main contact of the interrupting section, and a tripping signal is applied to activate the tripping drive device to trip the main contact of the interrupting section. It is configured.

However, in the course of these operations, if an abnormality occurs due to galling or breakage of the mechanism, there is a device that can detect this early, and an abnormality monitoring device is used for this purpose.

Conventional abnormality monitoring devices are configured to measure the time from when a closing command is given until the main contact of the interrupter comes into contact, and determine an abnormality when the difference from a reference value is greater than a predetermined value. . For this reason, an abnormality monitoring device must be connected between the terminals of the circuit breaker for measurement, which may cause a power outage to the system.In the case of a tank type, the upper terminal of the bushing must be connected, which requires extensive work. The connection work was being done.

[Purpose of the invention]

An object of the present invention is to provide a circuit breaker abnormality monitoring device that can easily detect abnormalities in an operating system.

[Summary of the invention]

The present invention provides an auxiliary contact that opens and closes in conjunction with the operation of the operating system, and compares the time from the signal input to the closing coil or tripping coil of the circuit breaker to the operation of the auxiliary contact with a reference value. The system is designed to detect whether the operation system is normal or abnormal.

[Embodiments of the 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 shutoff part is configured in a tank 1 filled with arc-extinguishing gas,
This interrupting part has a main contact 4 consisting of a fixed contact 2 and a movable contact 3. The movable contactor 3 is connected to an insulation operation va5, and the other end of the disconnection operation rod 5 is led out of the tank 1 via a link mechanism 6 and connected to an operation rod 7. The operating rod 7 is connected to a closing spring 8 that closes the movable contact 3 to the fixed contact 2, and an operating piston 11 that receives pressure to open the movable contact 3.

The operating piston 11 is slidably disposed within the cylinder 9, and when a command is given to the tripping coil 12, the operating piston 11 is is driven downward in the opening direction. When the operating piston 11 reaches the open position, it is locked and held in position by the latch mechanism. This latch mechanism 5 operates when the operating piston 11
unlock the lock.

A movable contact 15 serving as a short-circuiting conductor is connected to the middle of the operating rod 7, and a pair of fixed contacts 16 a , 16 b , 17 a , respectively on both sides of the movable contact 15 are connected.
17b, and each of these contacts constitutes an auxiliary contact for monitoring.

Next, the opening/closing operation will be briefly explained. This figure shows the closed state, and when a command is given to the tripping coil 12, compressed air from the container 13 is supplied into the air chamber A, driving the operating piston 11 downward. The operation of the operating piston 11 drives the movable contact 3 via an operating door or the like, and the fixed contact 2 is also separated, and the main contact 4 is opened. Next, the movable contact 15 separates from the fixed contacts 16a, 16b, and at the end of this tripping operation, the movable contact 15 moves away from the fixed contacts 17a, 17b.
After that, the operating piston 11 connects the latch mechanism 2.
5, and the tripped state is maintained.

On the other hand, the closing operation is performed by giving a command to the closing coil to unlock the operating piston 11 by the latch mechanism 5, and by using the return force of the closing spring 8 which is energized during the tripping operation. Of course, at this time, the compressed air in the air chamber A has already been discharged, and the operating piston 1lVc does not act as a reaction force of the closing spring 80. By this operation, first, the fixed contact 17a,
The bridge between 17b is removed, and then the fixed contacts 16a and 16b
After that, the movable contact 3 comes into contact with the fixed contact 2, resulting in the closed state shown in the figure.

- It is configured so that it can be used. As can be seen from the above explanation, the auxiliary contacts include the movable contact 15 and the fixed contact 16.
A and 16b constitute an A contact, and movable contact 15 and fixed contacts 17a and 17b constitute a B contact.

The operating characteristics of these a and b contacts and the main contact 4 are shown in FIG.

The time Tcl from when the closing coil is energized until the b contact opens, that is, until the movable contact 15 separates from the fixed contacts 17a and 17b, and the time a from when the closing coil is energized
Until the contact is closed, that is, the movable contact 15 is the fixed contact 1.
6a, 16b, the time Tc2 until contact 1
6a, 16b and contacts 17a, 17b by applying Vc11L pressure and using it together with a timer or the like. Similarly, the tripping coil 12 is energized and the time T from when the a contact opens. 1 and the time To2 from when the tripping coil 12 is excited until the b contact closes. Also, based on this information, the deviation time Tc3 between the a and b contacts is determined. 'r, a can also be obtained.

Each of these times is almost constant unless there is an abnormality in the operation system, but if there is an abnormality, it changes, so by monitoring each time it is possible to detect whether it is normal or abnormal. An example of a monitoring device is shown in FIG.

Amplify the electric signals of To and Tc by amplifier I,
Next, a comparator 31 removes minute waveforms, reads the input electrical signal as time using a pulse signal from a clock 32, and outputs it to a decimal caranter.

Further, by setting a normal value in advance on the digital switch A, comparing the set value with the comparator A, and outputting the result, normality or abnormality can be detected.

In the above embodiment, nine movable contacts 15 are connected to the operating rod 7.
Although the auxiliary contact has been configured mainly around , it is not limited to this configuration. For example, an auxiliary contact 18 is generally configured as shown in FIG. 1 to obtain a switching signal as a signal to a circuit breaker control circuit.

Therefore, a friend monitoring device may be connected to this auxiliary contact 18 as described in FIG. 3 and the like. Further, although the monitoring device obtains information on both the closing and the tripping as the time elements to be monitored, it is also possible to automatically obtain the information only during one of the operations. Further, in carrying out the present invention, the operating mechanism for driving the movable contactor 3 in response to a closing or tripping command may have any number of configurations, not limited to the illustrated example. Furthermore, there are various ways to measure the operation time of the auxiliary contact, but there are
By measuring based on the excitation command signal No. 2, it is possible to detect an operation delay element that appears at the initial stage of operation, such as when the play in the pin connection increases.

〔Effect of the invention〕

As explained above, the present invention provides an auxiliary contact that is linked to the operation of the circuit breaker, and connects a device that monitors the operation time to this auxiliary contact. It can detect abnormalities, does not adversely affect the system, and has a simple configuration and can be permanently installed, so the large-scale work required in the past can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an abnormal operation monitoring device for a circuit breaker according to an embodiment of the present invention, FIG. 2 is a diagram of operating characteristics of each part of FIG. 1, and FIG. 3 is a circuit diagram showing an example of an operating time monitoring device. It is. 2... Fixed contact, 3... Movable contact, 12... Tripping coil, 15... Movable contact, 16 a, 16 b, 17 a. 17b... Fixed contact, 26... Closing coil.

Claims (1)

[Scope of Claims] 1. A circuit breaker having an operation mechanism that electrically gives a command to close or trip the circuit breaker and mechanically transmits a driving force based on this command, 1. An abnormal operation monitoring device for a circuit breaker, comprising: an auxiliary contact that is linked to the operation of a mechanism; and a monitoring device that monitors the operating time of the auxiliary contact. 2. The abnormal operation monitoring device for a circuit breaker according to claim 1, wherein the monitoring device obtains the operation time of the auxiliary contact based on the command.