JP6379427B2 - Antenna device for insulation diagnosis - Google Patents

Description

  The present invention relates to an insulation diagnosis antenna device and a ground coil insulation diagnosis method that can detect electromagnetic waves generated by partial discharge with high accuracy from a ground coil in equipment installed on a track of a magnetically levitated railway.

A number of ground coils are installed on the track of the magnetic levitation railway along the traveling direction of the vehicle to propel, levitate and guide the vehicle.
In this ground coil, when the insulation performance deteriorates, partial discharge occurs, and electromagnetic waves accompanying the discharge are emitted. By detecting such an electromagnetic wave, abnormality determination of the ground coil is performed.

For example, in the ground coil insulation diagnosis apparatus disclosed in Patent Document 1, a plurality of electromagnetic wave detection antennas are installed at predetermined intervals so as to face the ground coil laid on the track of the magnetic levitation railway. Has been.
These electromagnetic wave detection antennas are installed on the side surface of a superconducting magnetic levitation railway vehicle traveling on a guideway. The detection signals detected by the electromagnetic wave detection antennas are taken into an information processing apparatus, and the ground coil Insulation diagnosis of the ground coil is performed by measuring the waveform and signal intensity of electromagnetic waves caused by partial discharge.

JP2013-50383A

  However, electromagnetic waves generated by partial discharge in the ground coil are weak, and the dipole antenna used as the electromagnetic wave detection antenna can detect accurate fluctuations of electromagnetic waves from the ground coil due to the influence of external noise and the like. As a result, there is a problem that an accurate insulation diagnosis of the ground coil cannot be performed.

  The present invention has been made in view of the above-described circumstances, and can accurately detect electromagnetic waves generated by partial discharge in a ground coil without being affected by external noise, and can accurately detect ground coil insulation. An insulation diagnosis antenna device and a ground coil insulation diagnosis method capable of performing the above are provided.

In order to solve the above problems, the present invention proposes the following means.
In the antenna device for insulation diagnosis of the present invention, the reflector is formed by a part of an elliptic cylindrical surface centering on the reference axis positioned in the vertical direction, and reflects the electromagnetic wave generated from the ground coil and concentrates on the reference axis And a rod-shaped antenna conductor that is disposed in parallel to the reference axis at the internal position of the reflector and receives the radio wave reflected by the reflector, and the antenna unit includes the antenna unit, A plurality of openings are arranged on the elliptical cylindrical surface of the reflector so as to face the ground coil, and are arranged at different positions in the traveling direction of the vehicle traveling in a predetermined direction.

  In the ground coil insulation diagnosis method of the present invention, the electromagnetic wave generated from the partial discharge of the ground coil is reflected and concentrated toward the reference axis, and then received at the position of the reference axis. And an identification step for identifying whether or not an abnormality has occurred in the ground coil based on the waveform, intensity, and the like of the electromagnetic wave received in the radio wave reception step.

According to the antenna device for insulation diagnosis of the present invention, the reflector provided in the antenna unit is formed by a part of the elliptic cylindrical surface, and is installed along the vertical reference axis by the reflector of the elliptic cylindrical surface. The electromagnetic wave generated from the ground coil can be reflected and concentrated toward the antenna conductor.
Thereby, in the said antenna unit, the electromagnetic waves which generate | occur | produce by partial discharge with a ground coil can be detected reliably, without being influenced by external noise, and the insulation diagnosis of a ground coil can be performed correctly.
In the above antenna unit, when there is an abnormality in the ground coil (when partial discharge occurs from outside the expected range), the electromagnetic wave generated by the partial discharge of the ground coil is concentrated on the antenna conductor in the reflector. I can't. As a result, in the antenna unit, it is possible to determine that the ground coil having no electromagnetic wave concentration on the antenna conductor is abnormal, and the abnormality can be easily detected.
In addition, the antenna unit is arranged such that the opening of the elliptical cylindrical surface of the reflector faces the ground coil, and a plurality of antenna units are arranged at different positions in the traveling direction of the vehicle traveling in a predetermined direction. By making this shift correspond to the voltage phase applied to the ground coil, slight fluctuations in electromagnetic waves can be reliably detected.

In the ground coil insulation diagnosis method of the present invention, the electromagnetic wave generated from the partial discharge of the ground coil is reflected and concentrated toward the reference axis, and then received at the position of the reference axis. Then, based on the waveform, intensity, etc. of the received electromagnetic wave, it is identified whether an abnormality has occurred in the ground coil.
In such a ground coil insulation diagnosis method, the electromagnetic waves generated from the partial discharge of the ground coil are reflected and concentrated toward the reference axis by reflecting the electromagnetic waves generated from the partial discharge of the ground coil, so that Therefore, the ground coil can be reliably detected without being influenced by the above, and the ground coil insulation diagnosis can be performed accurately.

1 is an overall configuration diagram showing a schematic configuration of an insulation diagnosis antenna device and a ground coil insulation diagnosis method according to an embodiment of the present invention. It is the whole structure of an antenna unit. It is a top view which shows the positional relationship of an antenna unit. It is a figure which shows the movement path | route of the electromagnetic waves reflected by an antenna unit. It is a figure which shows the movement path | route of the electromagnetic wave reflected by an antenna unit, Comprising: The movement path | route of the electromagnetic wave emitted from the ground coil in the assumption range, and the movement path of the electromagnetic wave emitted from the ground coil outside the assumption range, respectively Show. It is a front view which shows the positional relationship of the antenna element and antenna base in an antenna unit. It is a front view which shows the modification which concerns on arrangement | positioning of an antenna unit.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram illustrating a schematic configuration of an insulation diagnosis antenna device and a ground coil insulation diagnosis method according to the present embodiment. Reference numeral 1 denotes a magnetic levitation railway measurement vehicle.
The measurement vehicle 1 travels along the guideway 2 in the directions of arrows (A)-(B). The guideway 2 includes a number of propulsion system ground coils for advancing the measurement vehicle 1. 3 (3A-3C) is laid. Further, on the measurement vehicle 1 facing the propulsion system ground coil 3 (3A to 3C), there is provided a superconducting magnet that floats the vehicle 1 and travels in the directions of arrows (A) to (B). It is omitted in the drawing.
Assuming that propulsion system ground coils 3 (3A to 3C) are supplied with three-phase alternating current, and the voltage applied to each coil is in phase with the energized current, a pitch of 60 degrees (ground coil laying) It is considered that partial discharge is likely to occur at each phase of pitch: 1/2 of D).

The propulsion system ground coil 3 of the magnetic levitation railway emits an electromagnetic wave S by partial discharge, and the propulsion system ground coil is measured by sequentially measuring the electromagnetic wave S with an insulation diagnosis antenna device 10 (described later). 3 insulation diagnosis is performed.
At this time, the distance to the partial discharge region (indicated by the symbol E) is not constant due to factors such as the shaking of the measurement vehicle 1 and the thickness of the constituent members, but the range of the deviation can be assumed. The insulation diagnostic antenna device 10 can receive the electromagnetic wave S radiated from the partial discharge region and the vicinity thereof without any trouble. Further, it is possible to identify the propulsion system ground coil 3 having an abnormality by estimating the position from the received time.

The insulation diagnostic antenna device 10 mounted on the measurement vehicle 1 will be described in more detail with reference to FIGS.
As shown in FIGS. 1 and 2, the insulation diagnosis antenna device 10 includes a reflector 11 and an antenna conductor 12 that receive electromagnetic waves partially discharged from the propulsion system ground coil 3 (3 </ b> A to 3 </ b> C) serving as a measurement target. And a data processing device 14 for determining whether or not the propulsion system ground coil 3 (3A to 3C) is abnormal from the electromagnetic waves received by the antenna unit 13.

The reflector 11 is formed by a part of an elliptic cylindrical surface 15 centering on a reference axis O1 positioned in the vertical direction (arrow (c)-(d) direction), and a radio wave reflector (metal plate, or A net) is disposed, and electromagnetic waves (indicated by reference numeral S) generated from the propulsion system ground coil 3 (3A to 3C) are reflected and concentrated on the reference axis O1.
In addition, the concave portion that is the inner side of the elliptical cylindrical surface 15 of the reflector 11 is an opening 16, and the propulsion system ground coil 3 that becomes the measured portion that becomes the measured portion so as to face the opening 16. (3A to 3C) are arranged.
The central axis of the elliptic cylindrical surface 15 of the reflector 11 is at a position indicated by the symbol O, and the reference axis O1 of the elliptic cylindrical surface 15 is disposed on a long axis D1 passing through the central axis O.

As shown in FIG. 2, the antenna conductor 12 is arranged along the reference axis O1 at the internal position of the reflector 11, and receives the radio wave reflected by the reflector 11. And an antenna base 18 that supports the central portion of the antenna element 17 on the side portion of the measurement vehicle 1.
The antenna conductor 12 has a length corresponding to the wavelength of the electromagnetic wave S radiated from each of the plurality of propulsion system ground coils 3 (3A to 3C).

As shown in FIG. 1, the antenna unit 13 is arranged so that the opening 16 of the elliptical cylindrical surface 15 of the reflector 11 faces the propulsion system ground coil 3 (3A to 3C), and an arrow ( A) A plurality of vehicles are arranged at different positions in the traveling direction of the vehicle traveling in the direction of (b).
Each of the plurality of antenna units 13 is set at a position corresponding to the partial discharge area and the directivity of the electromagnetic wave S generated from the propulsion system ground coil 3 (3A to 3C).

  Further, in the antenna unit 13, the reflector 11 is formed by a part of the elliptic cylinder surface, and is directed toward the antenna conductor 12 installed along the reference axis O <b> 1 in the vertical direction by the reflector 11 of the elliptic cylinder surface. Thus, the electromagnetic wave S generated from the propulsion system ground coil 3 (3A to 3C) can be reflected and concentrated.

Specifically, as shown in FIG. 3, the reflector 11 of the antenna unit 13 has a shape that forms part of an ellipse A, and is perpendicular to a certain point on the long axis D1. One of the ellipses A divided into two at the intersection with is made a cross-sectional shape.
In an ellipse A that forms part of the reflector 11 of the antenna unit 13, an electromagnetic wave generation point a1 that is expected to generate a partial discharge of the propulsion system ground coil 3 (3A to 3C) is provided, and another point a2 is The focus of the electromagnetic wave collected by the reflector 11 (hereinafter referred to as the electromagnetic wave focus) is set, and the antenna conductor 12 is installed at the electromagnetic wave focus a2. The electromagnetic wave generation point a1 and the electromagnetic wave focus a2 are arranged on the long axis D1 in the ellipse A.
Further, the antenna conductor 12 installed at the electromagnetic wave focus a2 in the ellipse A has isotropic directivity with respect to a plane parallel to the plane in the ellipse A.
In the antenna unit 13 configured as described above, the electromagnetic wave S generated radially from the electromagnetic wave generation point a1 by the partial discharge of the propulsion system ground coil 3 (3A to 3C), as shown in FIG. After reflection on the eleventh surface, the position is set so as to reach the electromagnetic wave focus a2 where the antenna conductor 12 is installed at the same time to ensure a large gain (radio wave receiving step).

As a result, in the antenna unit 13, as shown in FIG. 5, even when an electromagnetic wave (indicated by reference numeral S ′) is radiated from outside the assumed range other than the electromagnetic wave generation point a1, the electromagnetic wave S ′ A2 does not reach at the same time, interferes and weakens, and the influence of external noise caused by the electromagnetic wave S ′ can be minimized.
Further, for the antenna conductor 12, a large gain can be secured by reducing the influence of the phase shift of the electromagnetic wave S emitted radially from the electromagnetic wave generation point a1 and its vicinity by appropriately setting the element diameter. can do.

The shape of the reflector 11 is specified by three parameters such as the length of the major axis D1 or the minor axis D2, the eccentricity, and the width dimension of the opening 16. By adjusting these values, the electromagnetic wave is generated. It is possible to adjust the degree of convergence of the electromagnetic wave S to the electromagnetic wave focal point a2 from the existence range of the assumed radiation source in the vicinity of the point a1 and vice versa, and to optimize the design for the antenna element diameter to be used. It can be carried out.
Further, in the antenna unit 13, the reflector 11 surrounds the antenna conductor 12 within the elliptic cylindrical surface 15 of the reflector 11 excluding the opening 16, so that the arrival of external noise from other than the opening 16 is eliminated. And adverse effects of measurement can be minimized.
In the antenna unit 13, it is desirable that the opening 16 of the reflector 11 is sufficiently larger than the wavelength of the electromagnetic wave S that can be received in order to maximize the gain improvement effect of the antenna conductor 12.

The operation of the insulation diagnosis antenna apparatus 10 configured as described above will be described with reference to FIGS. 1 and 5.
By moving the measurement vehicle 1 along the arrangement direction of the propulsion system ground coils 3 (3A to 3C) to be measured (directions of arrows (A) to (B)), the antenna conductor 12 of the antenna unit 13 is moved. Then, a scanning process is performed to measure the waveform, intensity, and the like of the electromagnetic wave S emitted from the propulsion system ground coil 3 (3A to 3C) (scanning in the direction of arrow A is shown in FIG. 1).
In the measurement, the position or time and speed at the time of reception of the electromagnetic wave S is recorded, and the electric equipment or the part facing the reception at the time of reception can be specified, whereby the propulsion system ground coil 3 (3A to 3A- 3C) The partial discharge generating device or location is specified.

Specifically, in the antenna unit 13, when a partial discharge occurs within the assumed range of the propulsion system ground coil 3 (3 </ b> A to 3 </ b> C) (indicated by reference numeral M <b> 1), Based on the electromagnetic wave S, the state of the propulsion system ground coil 3 (3A to 3C) can be monitored.
On the other hand, in the antenna unit 13, when there is an abnormality in the propulsion system ground coil 3 (3 </ b> A to 3 </ b> C) (that is, when there is a discharge from M <b> 2 outside the assumed range), the propulsion system ground coil 3 (3 </ b> A to 3 </ b> C) The electromagnetic wave (indicated by reference numeral S ′) generated by the partial discharge cannot be concentrated on the antenna conductor 12 in the reflector 11.
As a result, the antenna unit 13 can determine that the propulsion system ground coil 3 (3A to 3C) that does not concentrate electromagnetic waves on the antenna conductor 12 is abnormal, and can easily detect the abnormality.
In other words, based on the detection result of the antenna unit 13, any of the devices having built-in propulsion system ground coils 3 (3A to 3C) installed in the directions of arrows (A) to (B) is a radiation source. It is possible to identify whether it is (insulation abnormality) (identification process).

As described above in detail, in the insulated diagnostic antenna device 10 according to the present embodiment, the reflector 11 of the antenna unit 13 is formed by a part of the elliptic cylinder surface, and the reflector 11 on the elliptic cylinder surface is used in the vertical direction. The electromagnetic wave S generated from the propulsion system ground coil 3 (3A to 3C) can be concentrated toward the antenna conductor 12 (electromagnetic wave focus a2) installed along the reference axis O1.
As a result, the antenna unit 13 can reliably detect the electromagnetic wave S generated by the partial discharge in the propulsion system ground coil 3 (3A to 3C) without being affected by external noise, and can accurately insulate the ground coil. Diagnosis can be made.

Further, in the antenna unit 13, when the propulsion system ground coil 3 is abnormal (when partial discharge occurs from outside the assumed range), electromagnetic waves (reference S ') generated by the partial discharge of the propulsion system ground coil 3 are detected. Cannot be concentrated on the antenna conductor 12 in the reflector 11. As a result, the antenna unit 13 can determine that the propulsion system ground coil 3 that does not concentrate electromagnetic waves on the antenna conductor 12 is abnormal, and can easily detect the abnormality.
The antenna unit 13 is arranged such that the opening of the elliptical cylindrical surface 15 of the reflector 11 faces the propulsion system ground coil 3 (3A to 3C) and travels in a predetermined direction (and longitudinal direction) of the vehicle. ), A plurality of positions are shifted to each other, so that a slight fluctuation of the electromagnetic wave S can be reliably detected by making these shifts correspond to the voltage phase applied to the propulsion system ground coil 3 (3A to 3C). be able to.

(Modification)
In the above embodiment, as shown in FIG. 1, a plurality of antenna units 13 are arranged with arrows (A)-(A) that are the direction in which the propulsion system ground coils 3 (3 </ b> A to 3 </ b> C) are arranged and the traveling direction of the measurement vehicle 1. It is arranged along the direction.
Here, as shown in the front view seen from the opening 16 in FIG. 6, in the antenna unit 13, the antenna conductor 12 installed inside the reflector 11 includes an antenna element 17 formed in a rod-like body, The antenna base 17 is configured to support the central portion of the antenna element 17 on the side of the measurement vehicle 1.

As shown in FIG. 6, the region where the antenna base 18 is located and the region where the gain cannot be expected due to the antenna characteristics become the insensitive body 18 </ b> A where the electromagnetic wave S cannot be detected.
That is, in the antenna unit 13, the intended gain improvement is obtained only in the antenna element 17, and the antenna element length is determined by the frequency band to be used. It is considered that the intended gain improvement cannot be expected.

Then, in response to such an event, in the insulation diagnostic antenna device 10 according to the modification, the range of the dead band 18A other than the portion of the antenna element 17 is disposed so as to be surrounded by the antenna elements 17 of the different antenna units 13. Thus, gain improvement can be expected over the entire range of the measurement target.
Specifically, the antenna unit 13 is limited to be installed along the direction in which the propulsion system ground coil 3 (3A to 3C) is arranged and the direction of arrows (A) to (B), which is the traveling direction of the measurement vehicle 1. Instead, as shown in FIG. 7, a plurality of positions may be arranged with their positions shifted in the vertical direction (in the directions of arrows (c) to (d)) with respect to the directions of arrows (a) to (b).

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  The present invention relates to an insulation diagnosis antenna device capable of detecting an electromagnetic wave generated by partial discharge with high accuracy from a ground coil in equipment installed on a magnetic levitation railway track, and a ground coil insulation diagnosis method. is there.

DESCRIPTION OF SYMBOLS 1 Measurement vehicle 3 (3A-3C) propulsion system ground coil 10 Insulation diagnostic antenna device 11 Reflector 12 Antenna conductor 13 Antenna unit 15 Elliptical cylindrical surface 16 Opening 17 Antenna element 18 Antenna base A Ellipse a1 Electromagnetic wave generation point a2 Electromagnetic wave focus O1 reference axis

Claims (3)

A reflector that is formed by a part of an elliptic cylindrical surface centered on a reference axis positioned in the vertical direction, and that reflects electromagnetic waves generated from the ground coil and concentrates on the reference axis;
A rod-shaped antenna conductor that is disposed in parallel with the reference axis at the internal position of the reflector and receives a radio wave reflected by the reflector;
The antenna unit is arranged such that the opening of the elliptical cylindrical surface of the reflector faces the ground coil, and a plurality of antenna units are arranged with their positions shifted in the traveling direction of the vehicle traveling in a predetermined direction ,
The antenna device for insulation diagnosis, wherein the antenna conductor and the ground coil are arranged on a long axis in an ellipse forming an elliptic cylinder surface of the reflector .   2. The antenna device for insulation diagnosis according to claim 1, wherein a plurality of the antenna units are arranged with their positions shifted in the vertical direction with respect to the traveling direction of the vehicle traveling in a predetermined direction.   The insulation diagnostic antenna device according to claim 1, wherein the antenna conductor has a length corresponding to a wavelength of a radio wave radiated from each of a plurality of coils arranged along the traveling direction.

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