JP2510207Y2 - Predictive maintenance equipment for gas-insulated power equipment - Google Patents

Description

[Detailed Description of Device] A. Field of Industrial Application The present invention relates to a predictive maintenance device using an ultrasonic sensor of a gas insulated power device.

B. Overview of the Invention This invention is a predictive maintenance device that detects internal partial discharges, etc. using the ultrasonic sensor of gas-insulated power equipment. By arranging and configuring a fixed and integrated one so that vibration can be transmitted, it is possible to check the operation of the device by oscillating one sensor and checking the output of the other sensor due to the vibration. To do.

C. Conventional technology In general, electric power devices such as conductors are stored in a tank, and a predictive maintenance sensor can be attached to a gas-insulated power device in which an insulating gas is filled in the tank to detect partial discharge inside the tank. Has been done. This predictive maintenance sensor device is arranged outside the tank so that the reliability of the power device is not deteriorated by the presence of the sensor.

Recently, a sensor is placed inside the tank in order to detect sufficient information before failure such as partial discharge that occurs inside the tank separately from noise, and its lead wire is drawn out of the tank and connected to the measuring instrument. Have been proposed.

In this way, when the sensor is installed in the tank, it is possible to inspect the sensor indirectly from the outside without removing the insulating gas from the tank and taking the sensor out of the tank. Will be needed.

Conventionally, as an inspection means from the outside of the tank of the ultrasonic sensor installed inside the gas-insulated power equipment, there is one as illustrated in FIG. This is because the oscillator 4 is connected to the lead wire 3 of the ultrasonic sensor 2 in the tank 1,
There is a method in which the ultrasonic wave W is transmitted from the above, the returning reflected wave is detected by the sensor 2 itself, and the operation of the sensor 2 is confirmed.

D. Problems to be Solved by the Invention According to the means for inspecting the sensor installed inside the gas-insulated power equipment as described above, there were the following problems.

First, there is an obstacle in the ultrasonic wave reflection path transmitted from the sensor, the reflected wave does not return, and the sensor cannot be inspected.

Secondly, one ultrasonic sensor performs transmission and reception, which complicates the processing circuit.

Thirdly, since the level of the reflected wave becomes small, it is difficult to accurately judge the performance of the sensor.

The present invention has been made in view of the above points, and an object of the present invention is to newly provide a predictive maintenance device for a gas-insulated electric power device, which enables a sensor inside the tank to be accurately and easily inspected from outside the tank.

E. Means for Solving the Problems The predictive maintenance device for gas-insulated power equipment of the present invention has a plurality of ultrasonic sensor bodies fixed and integrated inside a tank of the gas-insulated power equipment so that vibrations can be transmitted to each other. It is characterized by being arranged and arranged.

F. Action With the above configuration, when confirming the operation of the predictive maintenance device, one ultrasonic sensor is oscillated,
By transmitting the vibration to the other ultrasonic sensor and checking the output value at that time, it is possible to accurately check whether the other ultrasonic sensor is operating normally or whether there is an abnormality such as peeling of the piezoelectric element. It is possible.

G. Embodiment An embodiment of the predictive maintenance device for gas insulated power equipment of the present invention will be described below with reference to FIGS.

In FIGS. 1 to 3, parts corresponding to those in FIG. 4 described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a schematic vertical sectional view of an essential part showing an installation state of the apparatus of this example, 1 is a tank for enclosing an insulating gas, 5 is a conductor, and 6 is a sensor device section.

The sensor device unit 6 is configured as shown in the enlarged cross-sectional view of the main part of FIG.

That is, the two ultrasonic sensors 7 and 8 are arranged side by side and their side portions are bonded and fixed integrally. These ultrasonic sensors
7 and 8 are housed in the shield case 9, and the ultrasonic sound absorbing material 10 is filled in the gap between the side and bottom of the ultrasonic sensors 7 and 8.

A wire mesh 11 is installed on the front surface of the shield case 9.
The lead wire 3 is connected to each of the ultrasonic sensors 7 and 8. Each lead wire 3 penetrates the bottom plate of the shield case 9 and the wall of the tank 1 and is drawn to the outside.

Each lead wire 3 led out to the outside constitutes a predictive maintenance device which is connected to a measuring device (not shown) to detect an internal partial discharge.

Next, another configuration example of the sensor device section in the device of this example will be described with reference to FIG. This is two ultrasonic sensors
The center lines 12 and 13 of 7 and 8 are tilted by an angle θ. That is, the lower corners of one ultrasonic sensor 7 are aligned with the lower corners of the other ultrasonic sensor 8, and the center lines 12 and 13 of both ultrasonic sensors are aligned.
Form an angle θ.

In this state, the adhesive 1 is placed between the two ultrasonic sensors 7 and 8.
It is an arrangement of 4 pieces.

Although the adhesive 14 is used in the present embodiment, the present invention is not limited to this, and any means can be used as long as it is coupled so that the vibration of one ultrasonic sensor is transmitted to the other ultrasonic sensor. Such means may be used.

Further, when the center lines 12 and 13 of the two ultrasonic sensors 7 and 8 are configured to have the angle θ, the detection range can be widened toward the end.

Next, the operation confirmation means of the apparatus of this example configured as described above will be described.

First, when performing the operation confirmation test, one of the ultrasonic sensors 7 is selected, the lead wire 3 is removed from the measuring instrument, and the ultrasonic sensor 7 is connected to the oscillator 4.

Then, the oscillator 4 is operated to oscillate one ultrasonic sensor 7. The vibration at this time is transmitted to the other ultrasonic sensor 8 main body to which the ultrasonic sensor 7 main body is bonded and integrated, and is measured by the measuring instrument. By checking the measured output value, it is possible to check whether the other ultrasonic sensor 8 is operating normally or whether there is an abnormality such as peeling of the piezoelectric element. When inspecting one ultrasonic sensor 7, this is connected to a measuring instrument, and the other ultrasonic sensor 8 is connected to an oscillator and oscillates as described above.

H. Effect of the Invention As described in detail above, according to the predictive maintenance device for a gas-insulated power device of the present invention,
Since a plurality of ultrasonic sensor main bodies are fixedly integrated and arranged so that vibration can be transmitted, one ultrasonic sensor is oscillated and the other vibration is transmitted when the operation of the device of the present invention is confirmed. It is possible to accurately check whether the other ultrasonic sensor is operating normally or whether there is an abnormality such as peeling of the piezoelectric element by transmitting it to another ultrasonic sensor and checking the output value at that time. . Also, because the reflected wave of the ultrasonic wave emitted from the sensor is not received by the ultrasonic sensor, it is possible to prevent that the sensor cannot be inspected because there is an obstacle in the ultrasonic wave reflection path and the reflected wave does not return. effective.

Further, since the oscillation sensor and the reception sensor operate in different circuits, there is an effect that the circuit configuration can be simplified.

[Brief description of drawings]

FIG. 1 shows an embodiment of the predictive maintenance device for gas-insulated power equipment of the present invention. FIG. 1 is a schematic vertical cross-sectional view of a main part, FIG. 2 is an enlarged vertical cross-sectional view of the main part, and FIG. FIG. 4 is an enlarged longitudinal sectional view of an essential part illustrating a conventional predictive maintenance device for gas-insulated electric power equipment, and FIG. 1 ... Tank, 3 ... Lead wire, 4 ... Oscillator, 6 ...
Sensor unit, 7,8 ... Ultrasonic sensor, 9 ... Shield case, 10 ... Ultrasonic sound absorbing material, 11 ... Wire mesh, 14 ... Adhesive.

Claims (1)

(57) [Scope of utility model registration request] 1. A predictive maintenance device for detecting an internal partial discharge or the like using an ultrasonic sensor of a gas-insulated power device, wherein a plurality of ultrasonic sensor bodies arranged in a tank filled with insulating gas are mutually vibrated. A predictive maintenance device for gas-insulated electric power equipment, comprising a sensor device unit that is fixed and integrated so as to be able to transmit.