JP3445353B2 - Operation monitoring device for power switchgear - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power switchgear equipped with a sensor having a position detecting function for detecting and monitoring the opening / closing operation state of a power switchgear such as a gas insulated switchgear. The present invention relates to an operation monitoring device.

[0002]

2. Description of the Related Art Generally, in a circuit breaker used as a power switch, an auxiliary switch is provided in its operating mechanism for displaying the switching operation state of the circuit breaker and measuring the switching operation time. Is provided. This auxiliary switch opens and closes in conjunction with the opening and closing operation of the operating mechanism of the circuit breaker.
With contacts and b settings.

However, since this auxiliary switch is operated by the mechanical contacts a contact and b contact, the auxiliary switch does not operate due to wear of contacts and foreign substances adhering to it as the number of cumulative switching operations of the circuit breaker increases. There was a problem of becoming stable.

Therefore, recently, with the development of a monitoring system for predicting an abnormality of a circuit breaker,
As a means for detecting the switching operation state of the circuit breaker, a contactless proximity type sensor has been used instead of the conventional auxiliary switch. An example of this type of sensor is a sensor that uses high frequency oscillation.

FIG. 5 shows an example of a conventional operation monitoring device for a power switchgear having a sensor utilizing such high frequency oscillation. Here, a vertically arranged puffer type gas circuit breaker is shown as the power switchgear. First, in this puffer type gas circuit breaker 1, a fixed electrode 3 and a movable electrode 4 are operably arranged in a sealed case 2 in which SF6 gas is sealed, and a puffer mechanism 5 is attached to the movable electrode 4 side. It is the opening and closing device formed in. Then, when the electrodes 3 and 4 are opened and closed, the insulating gas compressed by the puffer mechanism 5 is blown to the arc generated between the electrodes 3 and 4.
It is configured to extinguish an arc.

The movable electrode 4 of the puffer type gas circuit breaker 1
The opening / closing operation of is performed by the vertical movement of the operation piston 9 of the operation mechanism 8 connected via the insulating rod 6 and the operation rod 7. That is, the operating piston 9 of the operating mechanism 8 moves downward by opening the hydraulic trip valve 12 having the accumulator 10 and the oil pump 11 to trip the movable electrode 4 from the fixed electrode 3 and to close it. When the valve 13 is opened, the valve 13 is moved upward and the movable electrode 4 is put into the fixed electrode 3.

Then, in the puffer type gas circuit breaker 1, an operation monitoring device 14 for detecting an opening / closing operation state.
Are provided in the operating mechanism 8. This operation monitoring device 1
4 is a monitoring case 15 that surrounds a part of the operating rod 7.
A position detector 16 fixedly provided on a portion of the operating rod 7 that moves within the monitoring case 15;
Two sensors 17a and 17b provided to face the position detection body 16 so as to penetrate through the wall surface of the sensor, and a sensor mounting plate 18 fixed to the outer surface of the monitoring case 15 to which these sensors 17a and 17b are mounted. Have. In this case, the position detection body 16 is composed of, for example, a metal flange that connects the operation rod 7 and the piston rod of the operation piston 9.

Further, the two sensors 17a and 17b have a position detecting function for detecting the position of the position detecting body 16 using high frequency oscillation. In other words, the two sensors 17a and 17b using high frequency oscillation stop oscillation due to changes in the self-inductance and loss of the sensor circuit when a metal, which is a detection object, approaches the oscillation coil that is sensitive to the approach. Is used to detect the position of the position detection body 16 in response to the approach of the position detection body 16. These sensors 17a and 17b are the movable electrode 4 of the puffer type gas circuit breaker 1 and the operating rod 7 connected to the movable electrode 4.
In the open state and the closed state, the open position and the closed position of the position detection body 16 provided on the operation rod 7 are detected, and the open position signal and the closed position signal are respectively emitted. It should be noted that the outputs of these sensors 17a, 17b are usually cables 19a, 1 such as twisted pair wires.
It is adapted to be transmitted via 9b to a sensor receiver, a measuring unit, etc. housed in a relay board (not shown).

[0009]

By the way, the sensor 17 of the operation monitoring device for the conventional power switchgear as described above is used.
Since the output signals from a and 17b are only the open position signal and the closed position signal, it is impossible to determine the failure of the sensor itself. Therefore, if the sensor itself fails, it may be detected as a failure of the power switchgear, and there is a limit to the reliability of the monitoring device in this respect.

The present invention has been proposed in order to solve the above problems of the prior art, and its purpose is to:
It is an object of the present invention to provide a highly reliable power switchgear operation monitor capable of self-monitoring a sensor having a position detection function.

[0011]

SUMMARY OF THE INVENTION An operation monitoring device for an electric power switchgear according to the present invention is an apparatus main body part having an opening / closing part for performing an opening / closing operation, and the opening / closing part is mechanically connected to the opening / closing part. An operation monitoring device for an electric power switchgear for monitoring the operation of the electric power switchgear, which has an operation mechanism having an opening / closing operation section for opening and closing the power switch, has the following features.

According to another aspect of the present invention, there is provided an operation monitoring device which is mechanically connected to an apparatus main body portion having an opening / closing portion for performing an opening / closing operation and which is mechanically connected to the opening / closing portion to open / close the opening / closing portion according to the operation. In an operation monitoring device for an electric power switchgear for monitoring the operation of an electric power switchgear having an operation mechanism including a position detecting member fixedly provided in a part of the opening / closing operation part of the operation mechanism. And a case surrounding a part of the opening / closing operation section including the position detecting body, and a sensor provided on the wall surface of the case and having a function of detecting the position of the position detecting body. The sensor is used for position detection. A signal transmission unit and a reception unit, and a transmission unit that transmits an output according to the movement distance of the position detection body are integrated, and are transmitted from the sensor when the opening / closing operation of the opening / closing unit is performed.
Output value that is known during normal operation of the sensor.
It is characterized in that an abnormality of the sensor itself is judged by comparing with the force level .

The operation monitoring device according to the second and third aspects,
In addition to the configuration described in claim 1, the arrangement of the sensors has the following features. That is, the operation monitoring device according to the second aspect is characterized in that the sensor is arranged at a position facing the position detection body in a direction orthogonal to the operation direction of the opening / closing operation section. Further, the operation monitoring apparatus according to claim 3 is characterized in that the sensor is arranged at a position facing the position detecting body in a direction parallel to the operation direction of the opening / closing operation section.

In addition to the configuration of the first aspect, the operation monitoring apparatus according to the fourth, fifth and sixth aspects has the following features in the position detecting system of the sensor. That is, the operation monitoring apparatus according to claim 4 is characterized in that the sensor is an ultrasonic sensor. Further, the operation monitoring apparatus according to claim 5 is characterized in that the position detection body is a conductor and the sensor is an eddy current type sensor. Furthermore, the operation monitoring apparatus according to claim 6 is characterized in that the sensor is an optical sensor.

[0015]

In the present invention having the above construction,
The following effects are obtained. That is, in the operation monitoring device according to claim 1, when the opening / closing operation of the opening / closing part of the power switchgear is performed, the position of the position detector fixedly provided in the opening / closing operation part for opening / closing the opening / closing part is set. It is possible to detect by the sensor and transmit an output according to the moving distance of the position detection body. And thus, by the sensor,
By transmitting an output according to the moving distance of the position detection object, it is possible to grasp not only the operating state of the power switchgear but also the operating state of the sensor itself from this output.

Especially, when the opening / closing operation of the opening / closing section is performed,
The output value sent is the known value during normal operation of the sensor.
By comparing with the output level, there is a difference in the output level when the sensor itself is in the normal operation state and when it is in the abnormal operation state, so it is easy and certain that the sensor is normal or abnormal due to the difference in the output level. Can be determined.

Further , in the operation monitoring apparatus according to claim 1,
Includes a transmitter and receiver for signals used for position detection, and
A transmitter that sends an output according to the moving distance of the position detector
By integrating, the sensor is unitized and the configuration
It can be simplified.

In the operation monitoring device according to claim 2,
The movement of the position detection body provided in the opening / closing operation section can be monitored by a sensor arranged in the orthogonal direction as a change in the distance from the sensor.

In the operation monitoring device according to claim 3,
The movement of the position detection body provided in the opening / closing operation unit can be monitored by a sensor arranged in the parallel direction as a change in the distance in the operation direction from the sensor.

In the operation monitoring device according to claim 4,
By radiating ultrasonic waves to the position detecting body and injecting the reflected wave into the sensor, the position of the position detecting body can be detected based on the change in the propagation time.

In the operation monitoring device according to claim 5,
By supplying a high-frequency current to the sensor, the position of the position detector can be detected based on the change in the eddy current generated in the position detector, which is a conductor located near the sensor.

In the operation monitoring device according to claim 6,
By irradiating the position detecting body with light and receiving the reflected light by the sensor, the position of the position detecting body can be detected based on the change of the reflected light.

[0023]

1 to 4, an embodiment in which an operation monitoring device for a power switchgear according to the present invention is applied to a puffer type gas circuit breaker 1 as shown in FIG. explain.

[1] Configuration of Embodiment First, FIG. 1 shows a first embodiment to which the inventions of claims 1 and 2 are applied. In the operation monitoring device 20 of the first embodiment, the position detection body 16 is fixedly attached to a part of the operation rod 7 corresponding to the opening / closing operation portion of the present invention. The wall surface of the monitoring case 15 surrounding a part of the operating rod 7 including the position detecting body 16 has a position detecting function at a position facing the position detecting body 16 in a direction orthogonal to the operation direction of the operating rod 7. A sensor 21 is arranged and attached to a sensor attachment plate 18 fixed to the outer surface of the monitoring case 15. This sensor 21
Is a sensor according to the present invention, and is configured to transmit an output according to the moving distance of the position detection body 16. Then, the detection signal of the sensor 21 is input via the cable 19 to a sensor receiver, a measuring unit, etc. housed in a relay board (not shown). The configuration of the puffer type gas circuit breaker 1 other than the operation monitoring device 20 is similar to that of the conventional example described above.

FIG. 2 shows a second embodiment to which the inventions of claims 1 and 3 are applied. In the operation monitoring device 20 of the second embodiment, the sensor 21 having the position detecting function of the present invention is the bottom plate 15a of the monitoring case 15.
Is attached at a position facing the position detection body 16 in a direction parallel to the operation direction of the operation rod 7. Also in the second embodiment, the detection signal of the sensor 21 is transmitted via the cable 19 to a sensor receiver, a measuring unit, etc. housed in a relay board (not shown). The rest of the configuration is similar to that of the first embodiment described above.

Further, the sensor 21 of FIGS. 1 and 2 as described above is constructed as shown in FIG. That is, as shown in FIG. 3, the sensor 21 is provided with a transmission section 22 and a reception section 23 of the signal S1 used for position detection at a position facing the position detection body 16, and the position detection body 1 on the opposite side.
The transmission unit 24 for transmitting the output S2 according to the moving distance of 6 is provided. Then, these transmitter 22 and receiver 2
3 and the transmitter 24 are integrated to form the sensor 21.

The position detecting method of the sensor 21 shown in FIGS. 1 and 2 is an ultrasonic method according to the present invention.
It is selected from the eddy current method and the optical method. That is, when the ultrasonic method is adopted, the transmitter 22 is the ultrasonic transmitter and the receiver 23 is the ultrasonic receiver. When the eddy current method is adopted, the transmitter 22 is a coil for passing a high frequency current, the receiver 23 is a probe for detecting the amount of change in the eddy current, and the position detector 16 is a conductor. In this case, for example, the position detector 16
It is configured as a metal flange as in the conventional example. Further, when the optical system is adopted, the transmitting section 22 is a light emitting section and the receiving section 23 is a light receiving section.

[2] Operation of the Embodiment The operation of the operation monitoring apparatus 20 of the first and second embodiments having the above-mentioned structure is as follows.

That is, when the movable electrode 4 of the puffer type gas circuit breaker 1 is opened / closed, the position detector 16 fixedly provided on the operation rod 7 for opening / closing the movable electrode 4 is opened.
Can be detected by the sensor 21 and an output according to the moving distance of the position detection body 16 can be transmitted.

In this case, the specific position detecting function differs depending on the position detecting method of the sensor 21. First, the sensor 2
When the ultrasonic method is adopted as the position detecting method of No. 1, the position detecting member 16 is moved from the ultrasonic wave transmitting section 22 of the sensor 21
The ultrasonic wave is radiated onto the ultrasonic wave, the reflected wave is made incident on the ultrasonic wave reception section 23, and the propagation time until the reflected wave reaches the ultrasonic wave reception section 23 is measured, whereby the position of the position detection body 16 is determined. Can be detected.

When the eddy current method is used as the position detecting method of the sensor 21, a high frequency current is passed through the coil (sensor head) 22 of the sensor 21, and the conductivity located near the coil (sensor head) 22. The position of the position detection body 16 can be detected by detecting the amount of change of the eddy current generated in the position detection body 16 which is the body by the probe 23. That is, coil (sensor head)
When a position detecting body 16 which is a conductor is brought close to the coil (sensor head) 22 while a high-frequency current is applied to the coil 22, a magnetic flux generated from the coil (sensor head) 22 is generated on the surface of the position detecting body 16. An eddy current is generated so as to cancel. The strength of the eddy current changes depending on the distance between the coil (sensor head) 22 and the position detection body 16 as well as the specific resistance, thickness, shape, etc. of the position detection body 16. By detecting with 23, the position of the position detection body 16 can be detected using an arithmetic circuit or the like.

Further, when the optical system is adopted as the position detecting method of the sensor 21, the light emitting section 22 of the sensor 21 irradiates the position detecting body 16 with light, and the reflected light is received by the light receiving section 23. It is possible to detect the position of the position detection body 16 by measuring the distance between the sensor 21 and the position detection body 16 based on this reflected light.

As described above, the position of the position detector 16 can be easily and reliably detected by the transmitter 22 and the receiver 23 of the sensor 21 regardless of which position detection method is adopted. Then, based on the position of the position detecting body 16 detected in this way, the transmitting unit 24 of the sensor 21 can transmit an output according to the moving distance of the position detecting body 16.

Therefore, by thus transmitting the output corresponding to the moving distance of the position detecting body 16 by the sensor 21, not only the operating state of the puffer type gas circuit breaker 1 but also the sensor 21 itself is output from this output. The operating status can be grasped. That is, since there is a difference in the output level when the sensor 21 itself is in the normal operating state and when it is in the abnormal operating state, it is possible to easily and reliably determine whether the sensor is normal or abnormal based on the difference in the output level. it can.

FIG. 4 is a diagram showing an example of output waveforms of the sensor 21 of the first and second embodiments as described above. Of these, FIG. 4A shows an output waveform example of the sensor 21 of the first embodiment of FIG. 1, that is, the sensor 21 arranged in a direction orthogonal to the operation direction (opening / closing operation direction) of the operation rod 7. . In FIG. 4A, the output of the sensor 21 is roughly classified into four levels a to d. That is, the a level is the maximum output value level of the sensor 21, the b level is the output level of the puffer type gas circuit breaker 1 in the "on" state, and the c level is the "off" state of the puffer type gas circuit breaker 1. Is the output level of. In this case, the range between the two levels b and c is a range showing an output according to the moving distance of the position detection body 16, and the output value is in this range when the sensor 21 is in a normal operation state. The d level is a level indicating a case where there is no output from the sensor 21.

Therefore, in the operation monitoring apparatus 20 of the first embodiment, for example, when the output becomes 0 due to the disconnection of the sensor 21 or when the sensor 21 itself fails, the sensor 21 itself is damaged. When any abnormality occurs, the abnormality of the sensor 21 itself can be easily and easily determined based on the relationship between the operation states of the puffer type gas circuit breaker 1 and the sensor 21 and the sensor output levels a to d as described above. It can be reliably detected.

On the other hand, FIG. 4B shows an output waveform example of the sensor 21 of the second embodiment of FIG. 2, that is, the sensor 21 arranged in the direction parallel to the operation direction (opening / closing operation direction) of the operating rod 7. ing. In FIG. 4B, the sensor 21
Of the four levels a as in FIG. 4 (A) described above.
It is roughly divided into ~ d. Therefore, also in the operation monitoring apparatus 20 of the second embodiment, when some abnormality occurs in the sensor 21 itself, the operating state of the puffer type gas circuit breaker 1 and the sensor 21 are the same as in the first embodiment. The abnormality of the sensor 21 itself can be easily and reliably detected based on the relationship between the operating state and the sensor output levels a to d.

[3] Effects of the Embodiments As described above, the first and the second shown in FIGS. 1 and 2.
In the operation monitoring device 20 of the embodiment, the sensor 21 sends an output according to the moving distance of the position detection body 16 to constantly monitor the operating state of the puffer type gas circuit breaker 1 based on this output. At the same time, the operating state of the sensor 21 itself can be constantly monitored. Therefore, the highly reliable operation monitoring device 20 having the self-monitoring function of the sensor 21 itself can be realized.

[4] Other Embodiments In the first and second embodiments, the case where one sensor is used has been described, but it is of course possible to use a plurality of sensors. Further, the specific configuration of the sensor can be appropriately selected according to the position detection method,
The position with respect to the position detector can also be set freely. On the other hand, the position detection body does not necessarily have to be provided on the operation rod, and can be arranged at an arbitrary position of the operation part for operating the opening / closing part of the power switchgear. Furthermore, the specific configuration of the position detector can be changed as appropriate. In addition, in the first and second embodiments, the case where the present invention is applied to the puffer type gas circuit breaker has been described, but the present invention is similarly applicable to general power switchgear having a switchgear,
Similarly, an excellent effect can be obtained.

[0040]

As described above, according to the present invention, the sensor is adapted to transmit the output corresponding to the moving distance of the position detecting body, so that the operating state of the power switchgear and the sensor can be obtained from this output. Since the operating state of itself can be easily and surely grasped, it is possible to provide a more reliable operation monitoring device for a power switchgear having a sensor self-monitoring function.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of an operation monitoring device for a power switchgear according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the operation monitoring device of the power switchgear according to the present invention.

FIG. 3 is a block diagram showing a sensor of the operation monitoring device of FIGS. 1 and 2.

4A and 4B are diagrams showing output waveform examples of the sensor of the operation monitoring device of FIGS. 1 and 2, wherein FIG. 4A is an output waveform diagram of the sensor of FIG. 1, and FIG. 4B is an output waveform diagram of the sensor of FIG. .

FIG. 5 is a sectional view showing an example of a conventional operation monitoring device for a power switchgear.

[Explanation of symbols]

1 ... Switchgear for electric power 2 ... hermetically sealed case 3 ... Fixed electrode 4 ... Movable electrode 5 ... Puffer mechanism 6 ... Insulating rod 7 ... Operation rod 8 ... Operating mechanism 9 ... Operation piston 10 ... Accumulator 11 ... Oil pump 12 ... Valve for external use 13 ... Valve for injection 14 ... Operation monitoring device 15 ... Monitoring case 16 ... Position detection body 17a, 17b ... Sensor 18 ... Sensor mounting plate 19, 19a, 19b ... Cable 20. Operation monitoring device 21 ... Sensor 22 ... Transmitter 23 ... Receiver 24 ... Transmitter

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-63-48718 (JP, A) JP-A-63-213231 (JP, A) JP-A-59-54130 (JP, A) JP-A-63- 184222 (JP, A) JP 62-206714 (JP, A) JP 57-96217 (JP, A) JP 57-39304 (JP, A) JP 56-103374 (JP, A) JP-A-55-41620 (JP, A) Actually open 3-79141 (JP, U) Actually open 57-121037 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01H 33/02 H01H 33/42 H01H 33/59 H02B 13/065

Claims (6)

(57) [Claims] 1. An apparatus main body part having an opening / closing part for performing an opening / closing operation, and an operating mechanism mechanically connected to the opening / closing part and having an opening / closing operation part for opening / closing the opening / closing part by its operation. An operation monitoring device for a power switchgear for monitoring the operation of a power switchgear, including a position detector fixedly provided at a part of the opening / closing operation part of the operation mechanism, and the position detector. A case enclosing a part of the opening / closing operation section, and a sensor provided on the wall surface of the case and having a position detection function of the position detection body, wherein the sensor is a transmission section and a reception section of a signal used for position detection, And a transmission unit that transmits an output according to the moving distance of the position detection body ,
The output value sent from the sensor during opening / closing operation is
An operation monitoring device for an electric power switchgear, wherein the abnormality of the sensor itself is determined by comparing with a known output level during normal operation of the sensor. 2. The operation monitoring of the power switchgear according to claim 1, wherein the sensor is arranged at a position facing the position detection body in a direction orthogonal to an operation direction of the opening / closing operation section. apparatus. 3. The operation monitoring of the power switchgear according to claim 1, wherein the sensor is arranged at a position facing the position detection body in a direction parallel to the operation direction of the opening / closing operation section. apparatus. 4. The operation monitoring device for an electric power switchgear according to claim 1, wherein the sensor is an ultrasonic sensor. 5. The position detector is a conductor, and
The operation monitoring device for a power switchgear according to claim 1, wherein the sensor is an eddy current type sensor. 6. The operation monitoring apparatus for an electric power switchgear according to claim 1, wherein the sensor is an optical sensor.