JPS61170660A - Oscillation measuring instrument - Google Patents

Abstract

PURPOSE:To measure the oscillation of a high electric potential part stably by transmitting a signal and supplying the electric power by using optical fibers. CONSTITUTION:Light is sent to the optical fiber 51 from a light source 8 continuously and converted into the electric power by a solar cell 9 and further, stabilized by a voltage regulator 10 to supply the DC electric power to an amplifier 2 or the like. Then, when the high electric potential part where an oscillation sensor 1 is fitted oscillates, an electrical signal of the voltage in proportion to its oscillation level is generated on the oscillation sensor 1. This electrical signal is adjusted to the prescribed voltage with the amplifier 2, A/D converted with an A/D converter 3, E/O converted with an electro/optic converter 4 and transmitted to a photo/electric converter 6 by the optical fiber 5. This is converted inversely with the photo/electric converter 6 and a D/A converter 7 to detect the oscillation of the high electric potential.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a vibration measuring device for an electric machine.

[Technical background of the invention and its problems]

In recent years, due to the difficulty in securing maintenance monitoring personnel and the decline in maintenance monitoring technology based on human senses, the demand for equipment that automatically detects and diagnoses various phenomena at key points in machinery has continued to increase. There is.

This is no exception for rotating electric machines.In addition to monitoring the coil temperature, around the stator, it is required to monitor the looseness of the coil end, which protrudes from the core and is supported by a soft structure such as tied string. There is.

This loosening monitoring could easily be done by vibration measurement, but since the vibration measurement position is in a high potential field,
The method used for general vibration measurement, in which a vibration sensor is guided to a vibration meter using a metal conductor wire, has many problems with dielectric strength.

[Purpose of the invention]

An object of the present invention is to provide a safe vibration measuring device that does not have pressure-resistant problems.

[Summary of the invention]

In the vibration measuring device of the present invention, the vibration detection end, which has a high potential, and the vibration-related electric signal extraction part are connected by an optical fiber, and the power for operating the vibration detection end is also supplied via the optical fiber. do.

[Embodiments of the invention]

Next, the present invention will be described with reference to embodiments shown in the drawings. Reference numeral 1 is a vibration sensor that is attached to a vibration detection position of a high potential section and generates a voltage proportional to the vibration level, and is connected to an amplifier 2 that adjusts the electric signal from this to a predetermined voltage t.8 is from the amplifier 2. This is an A/D converter that converts an analog electrical signal into a pulsed digital signal according to its level, and the output end of this converter is an IIE/optical conversion optical converter 4 that converts the pulsed electrical signal into an optical pulse signal. has been done.5
has high electrical insulation properties and is used to send the optical pulse signal emitted from the electrical/optical converter 4 to the optical/electrical converter 6, which is placed at a low potential and returns it to the digital electrical signal emitted by the A/D converter 8. , an optical fiber made of glass fiber or plastic that is highly flexible and allows light to pass through. 7 is a D/person converter that converts the digital signal from the photo/electrical converter 6 into an analog signal corresponding to the vibration level. 8 is a laser or other light source that supplies power to operate the electronic circuit in the high potential section, and 51 is a solar cell 9 that uses the light emitted from the light source 8.
This is an optical fiber similar to 5 for sending to. Reference numeral 10 denotes a voltage regulator, which converts the power generated by the solar cell 9 into stable DC power and supplies it to the 77121 A/D converter 8 and the electric/optical converter 4, respectively.

Now, the light source 8 continuously sends light to the optical fiber 51, which is converted into electric power by the solar cell 9, and further converted into stable DC power at a voltage vI4! When the electric/degree optical converter 4 is in a stable operating state, when the high potential part to which the vibration sensor 1 is attached vibrates, an electric signal with a voltage proportional to the vibration level is generated in the vibration sensor 1. This electric signal is adjusted to a predetermined voltage by an amplifier 2, further converted into a pulsed digital signal by an A/D converter 8, and sent to an electric/optical converter 4.

Then, the '4/optical converter 4 converts the pulsed electrical signal sent from the A/D converter 3 into an optical pulse signal, and transfers it to the optical/electrical converter 6 through the optical fiber 5.

The optical pulse signal corresponding to the vibration level transferred to the optical/electrical converter 6 is returned to an electric pulse signal, and restored by the D/A converter 7 to an analog signal of a voltage corresponding to the vibration level. The vibration of the high potential part is known from this analog signal.

Since the present invention uses a highly insulated and flexible optical fiber, it can be fixedly attached to a high-potential part, and the signal transmission method uses pulsed light, so analog light is used. Compared to transmission, the power consumed by the light emitting element can be extremely small.

It should be noted that the vibration detection parts placed in the high magnetic potential parts beyond the optical fibers 6 and 51 are not necessarily integrated;
If necessary, it can be placed separately from the vibration sensor l, and various modifications can be made without changing the gist.
Changes are possible.

〔Effect of the invention〕

As explained above, since the vibration measuring device of the present invention transmits signals and supplies power using optical fibers, it is possible to stably measure vibrations in a high potential section.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. 1... Vibration sensor, 2... Amplifier, 3... A/D
converter, 4... electric/optical converter, 5.51... optical fiber, 6... optical/electrical converter, 7... D/mu converter,
8...Light source, 9...Solar cell, 10...Voltage regulator.

Claims (1)

[Claims] A vibration sensor that generates an analog electrical signal according to the vibration of the test object, an amplifier that adjusts the voltage level of this electrical signal, an A/D converter that converts the analog signal into a digital signal, and a digital signal that converts the digital signal into an optical pulse. an optical fiber that transmits light; an optical/electrical converter that converts optical pulses into digital electrical pulse signals; and a D/A converter that converts digital signals back into analog signals. A light source, an optical fiber that transmits the light from the light source, a solar cell that converts the light into electricity, and the power generated by the solar cell is adjusted to stable direct current and connected to the amplifier and the A/D converter. and a voltage regulator that supplies the electrical/optical converter.