JPS6334820A - Position detector for breaker - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention detects the position of a current-carrying contact during the opening/closing operation of a gas-insulated switchgear, for example, and detects the opening/closing display and abnormality diagnosis during the opening/closing operation. The present invention relates to a position detection device for a non-contact circuit breaker.

(Prior art) A gas-free Nl switchgear has a switchgear and an auxiliary switch attached to the side of the operating device in a place that is difficult to see.
They display the operating status of gas-insulated switchgear and provide information to substation switchboards.

These opening/closing indicators and auxiliary switches are configured to operate by being mechanically connected to the end of the operating device. For this reason, as the number of operations of gas-insulated switchgear increases, the mechanical joints may wear out or break, and the contacts of auxiliary switches may become galled or oxidized, resulting in a loss of continuity. .

In addition, due to restrictions such as the number of switches that can be installed on switch indicators and auxiliary switches that are mechanically connected to the drive unit, it is difficult to obtain the large amount of information required to diagnose abnormalities during operation of gas-insulated switchgears. I couldn't.

In order to deal with these problems and to obtain highly reliable information such as displaying the opening/closing of circuit breakers and diagnosing abnormalities during opening/closing operations, methods using proximity sensors have been proposed.

This opening/closing display device equipped with a non-contact type proximity sensor is equipped with a position detection plate on the operating role of the opening/closing operation mechanism of the circuit breaker, and the proximity sensor is placed at a position corresponding to the position detection plate within the opening/closing stroke of the operating unit. By providing this, the proximity sensor outputs a signal in response to the arrival of the position detection plate when the circuit breaker is opened or closed.

(Problems to be Solved by the Invention) Therefore, when the circuit breaker opens or closes, the position detection plate moves in response, and a signal is output to the proximity sensor. However, such conventional methods have the following drawbacks. That is, when the stroke of the circuit breaker is short, or when it is structurally impossible to maintain a large distance between the position detection plate and the proximity sensor, it is difficult to arrange the proximity sensors linearly.

An object of the present invention is to detect the position of the interrupting part of a circuit breaker using I! !
It is an object of the present invention to provide a circuit breaker position detection device that can obtain highly reliable information for displaying the opening/closing of the circuit breaker and diagnosing abnormalities during the opening/closing operation by making the circuit breaker a contact point.

[Structure of the invention]

(Means and effects for solving the problem) The circuit breaker position detection device according to the present invention includes a position detection plate attached to a part of the circuit breaker opening/closing operation* structure at a predetermined position within the opening/closing operation stroke. A plurality of proximity sensors are located within the opening/closing operation stroke around the position detection plate and output in response to the arrival of the position detection plate in the azimuth direction and the movement direction with the movement direction of the position detection plate as an axis. It is characterized by being arranged in a staggered manner.

In the present invention, a plurality of proximity sensors are provided within a narrow opening/closing operation mechanism by shifting the proximity sensors in the azimuth force direction and the opening/closing operation direction, thereby making it possible to install many proximity sensors within the narrow opening/closing operation mechanism. The output signal of the proximity sensor can be used as diagnostic information for operation and maintenance of the breaker.

(Example) Hereinafter, an example of the present invention shown in the drawings will be explained.
The gas circuit breaker 1 shown in the figure has a cutoff part 3 in a gas tank 2 filled with insulating gas, and the fixed and contactable side of the cutoff part 3 is connected to bushings 4 and 5 that stand upright on both sides of the tank 2, respectively. The shutoff section 3 is configured to perform closing and shutoff operations by moving an operating rod 14 forward and backward using a compressed gas operating mechanism 6.

Conventionally, these gas circuit breakers 1 were provided with an opening/closing indicator or an auxiliary switch that mechanically linked to the movement of the operating mechanism 6 in an easily visible place. The position detection device that controls the abnormality diagnosis function during operation is made contactless.

That is, a position detection device WIO employing a non-contact method is provided between the connecting portion 8 of the interrupting portion 3 of the circuit breaker 1 and the operating mechanism portion 6 in the operating barrel 9. As shown in FIGS. 2 and 3, this position detection device 1!10 includes a connecting portion 8 of a blocking portion 3.
The position detection plate 12 and the proximity sensor 13 are assembled into a position detection case 11 provided between the operation 81 and the operation 81 structure 6.

As shown in FIG. 3, the position detection plate 12 is attached to a connecting portion 15 that connects the drive piston of the circuit breaker 1. Further, five proximity sensors 13a to 13e are installed shifted in the azimuth direction with the moving direction of the position detection plate 12 as an axis, and these five proximity sensors 13a to 13e
is further fixed by a mounting plate 20 and a nut 21 so as to be shifted and disposed appropriately within the range in which the position detection plate 12 moves.

It is necessary to consider the shape, material, etc. of this position detection plate 12 depending on the detection method of the proximity sensors 13a to 13θ.
Moreover, the distance to the proximity sensors 13a to 13e is also an important point. In the examples shown in FIGS. 2 and 3, the detection plate 12 is made into a cylinder so that the distances from each of the proximity sensors 13a to 13e are uniform.

With the above configuration, when the circuit breaker 1 performs an opening/closing operation, the detection plate 12 connected to the drive piston also moves.

At this time, the proximity sensor 13 is in the ON state only when the detection plate 13 approaches within a certain distance, and is in the OFF state otherwise. A signal with a tie 11 chart as shown at 13' in FIG. 4 is obtained. This signal corresponds to a stroke curve A expressed by Lel of the circuit breaker 1 + stroke of the piston and time. Since it is sufficient to measure the stroke curve A to determine whether the operation of the circuit breaker is good or not, according to the present invention, the stroke curve of the circuit breaker can be measured even if the stroke is not sufficiently long for the size of the proximity sensor.

〔Effect of the invention〕

As described above, according to the present invention, a large number of non-contact proximity sensors can be arranged at appropriate locations during the operation stroke of the circuit breaker, or it can be applied to locations where proximity sensors cannot be installed due to space limitations, so it can be applied to a variety of applications. Non-contact diagnosis of circuit breakers can be performed.

[Brief explanation of drawings]

FIG. 1 is an overall view showing an embodiment of the circuit breaker position detection device of the present invention including the entire circuit breaker, FIG. 2 is a cross-sectional front view showing the circuit breaker position detection device of the present invention, and FIG. FIG. 4 is a side view taken along the line ■-■ and a characteristic diagram showing the relationship between the stroke of the circuit breaker and the signal of the proximity sensor. 1... Breaker 2... Case 3... Breaking part 4. End...Bushing 6...Operation mechanism 8...Connection part 9...Cover
10...Position detection device 11...Position detection case
12...Position detection plate 13...Proximity sensor
14...Operation part 15...Joining part 20.
...Mounting plate 21...Natsuto (8733) Agent Patent attorney Yoshiaki Inomata (and 1 other person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) A position detection plate is installed at a predetermined position within the opening/closing operation stroke in the opening/closing operation mechanism of the circuit breaker, and a position detecting plate is located within the opening/closing operation stroke around this position detection plate and responds to the arrival of the position detection plate. This is a position detection device for a circuit breaker, in which a plurality of proximity sensors that output signals are installed so as to be shifted in the azimuth direction and the direction of operation with the operating direction of the position detection plate as an axis.