JPH08273089A - Loading time tap switching device - Google Patents

Abstract

PURPOSE: To easily install this device even at an existent loading time switcher as well by providing a transmitter equipped with a distortion gauge for detecting distortion caused by torque on the surface of a shaft and an antenna. CONSTITUTION: A torque detector 11 is provided with a distortion gauge 12 for detecting the distortion caused by torque while being stuck on the surface of a driving shaft 5 and a transmitter 13 connected to this distortion gauge 12 and equipped with the antenna, and fitted at any arbitrary position on the axis of the driving shaft 5. Then, a signal detected by the distortion gauge 12 is outputted through that antenna to a processor 9. In this case, since a signal transmitting means is radio, the structure of the signal transmitting means between the driving shaft 5 to be rotationally operated and the fixedly arranged processor 9 can be simplified and this device can be easily installed even at the existent loading time tap switcher as well. Besides, since signals are transmitted between the torque detector 11 and a receiver 14, there is no limitation in the arranging constitution between the both and the degree of freedom for design can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load tap changer, and more particularly to a load tap changer with an improved torque detecting device.

[0002]

2. Description of the Related Art A load tap switching device provided in a transformer changes the tap provided in the transformer when the load of a power transmission and distribution system fluctuates and the voltage change due to this fluctuation exceeds a certain limit. By switching, the voltage on the load side is kept constant. As its specific configuration, it has a mechanical contact for the tap of the transformer and also has an operating mechanism for moving the contact. Must be able to detect. Therefore, as one of the detection methods, a method of detecting the operating torque of the tap switching device under load by a torque detector is generally known.

The structure of a conventional load tap changer having a torque detector will be described below with reference to FIG. In the transformer tank 4, there were provided a switching switch 2 having a breaking mechanism for switching the transformer load current at high speed, and a tap selector 3 for interlocking with the switching switch 2 and selecting a tap of a tap winding. The tap changer 1 under load is housed. The load tap changer 1 is driven by transmitting the rotational force generated by the electric motor 7 housed in the electric operation mechanism 6 to the drive shaft 5. Then, the torque detector 8 is attached to the drive shaft 5 and measures the operating torque of the load tap changer 1 operated by transmitting the rotational force. Here, the measured torque signal is output to the processing device 9 via the signal line 10 to perform arithmetic processing, determination processing, and the like.

An example of a time characteristic pattern of the operating torque detected by the torque detector 8 is shown in FIG. Here, by performing arithmetic processing on these detected values by the processing device 9, it is possible to diagnose the abnormality of the tap switch 1 during load.

[0005]

However, since the torque detector 8 is mounted on the rotating drive shaft due to its characteristic, when transmitting the detection signal to the processing device 9, the signal is transmitted using a brush or the like. Was there. Therefore, it is easy to attach to a new product, but it is difficult to attach to an existing load tap changer due to its structure. It was necessary to remodel it. In particular, the temporary stop of the tap changer 1 during load may impair the reliability of the power transmission and distribution system and is not desirable. Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a torque detector that can be easily installed in an existing load tap changer.

[0006]

In order to achieve the above object, the present invention provides, as the invention of claim 1, a load tap changer equipped with a changeover switch and a tap selector, and an internal electric motor. An electric operating mechanism which has a rotational force, a drive shaft which transmits the rotational force generated by the electric operating mechanism to the load tap changer, and a strain which is installed on the drive shaft and is generated in the shaft is detected and detected. Tap switching under load, comprising a torque detector that wirelessly transmits a signal, and a receiver that receives the signal from the torque detector and transmits the signal to a processing device that performs arithmetic processing, etc. Provide a device.

According to a second aspect of the present invention, the torque detector comprises a strain gauge attached to the surface of the drive shaft for detecting strain caused by torque, and a transmitter having an antenna connected to the strain gauge. A load tap changer according to claim 1 is provided.

According to a third aspect of the present invention, the torque detector includes a strain gauge attached to the surface of the drive shaft for detecting strain caused by the torque, and a transmitter having an antenna connected to the strain gauge. The load tap switching device according to claim 1, wherein the entire device is covered with an electromagnetic shielding case.

The invention according to claim 4 is characterized in that a rotation angle detecting portion capable of detecting a rotation angle of the shaft is provided on the drive shaft and is connected to the torque detector. Item 3. A load tap changer according to item 3 is provided.

[0010]

In the torque detector having such a structure, since the signal transmission means is wireless, it is not necessary to consider a complicated signal transmission means between the rotating portion and the fixed portion, and the structure can be simplified accordingly. It will be possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. The same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. The torque detector 11 of the present embodiment includes the drive shaft 5
It is equipped with a strain gauge 12 attached to the surface of the shaft for detecting the strain caused by the torque, and a transmitter 13 having an antenna connected to the strain gauge 12 and mounted at an arbitrary position on the shaft of the drive shaft 5. The signal detected by the strain gauge 12 is transmitted to the receiver 14 via the antenna and output to the processing device 9 via the signal line 10.

In the torque detector 11 having such a structure, since the signal transmitting means is wireless, the structure of the signal transmitting means between the driving shaft 5 which rotates and the processing device 9 which is fixedly arranged is simplified. Therefore, it can be easily installed in an existing load tap changer.

Further, the torque detector 11 and the receiver 14 are
Since they are transmitted wirelessly, there is no restriction on the arrangement configuration between them, and the degree of freedom in design can be increased. Further, if the torque detector 11 is covered with an electromagnetic shielding case such as a metal case, it is possible to prevent noise on the signal due to electromagnetic interference.

Further, in the abnormality diagnosis of the tap changer during load, if a rotation angle detecting section capable of detecting a rotation angle is installed on the drive shaft 5 in order to measure the position of the internal changeover switch, the diagnosis result can be trusted. It is possible to further improve the property.

Further, as another embodiment of the present invention, a signal line 10 which is a wired signal, a strain gauge 12 and a transmitter 13 are provided.
By making the connection line between and the optical signal respectively,
It is possible to improve noise resistance.

[0016]

The torque detector of the present invention comprises a strain gauge for detecting strain due to torque on the shaft surface and a transmitter having an antenna connected to the strain gauge, and the detection signal is wirelessly transmitted through the antenna. Therefore, it is not necessary to consider complicated signal transmission means between the rotationally driven drive shaft and the fixedly arranged processing device. Therefore, the structure can be simplified by that much, and it can be easily installed in the existing load tap changer. Furthermore, since the torque detector and the receiver are wirelessly transmitted, there is no restriction on the arrangement configuration between them, and the degree of freedom in design can be increased.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a torque detector of the present invention.

FIG. 2 is a diagram showing an example of a time characteristic pattern of detected operating torque.

FIG. 3 is a block diagram of a load tap changer including a conventional torque detector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Load tap changer, 2 ... Switching switch, 3 ... Tap selector, 5 ... Drive shaft, 6 ... Electric operation mechanism, 7 ... Electric motor,
8, 11 ... Torque detector, 9 ... Processing device, 12 ... Strain gauge, 13 ... Transmitter, 14 ... Receiver.

Claims (4)

[Claims] 1. A load tap changer equipped with a changeover switch and a tap selector, an electric operating mechanism having an electric motor inside to generate a rotational force, and a rotational force generated by the electric operating mechanism. A drive shaft that transmits to the tap changer at the time of load, a torque detector that is installed on this drive shaft and that wirelessly transmits a signal that detects and detects the strain generated in the shaft, and a signal that receives the signal from the torque detector And a receiver for transmitting the data to a processing device that performs arithmetic processing, and the like. 2. The torque detector comprises a strain gauge attached to the surface of the drive shaft for detecting a strain caused by the torque, and a transmitter having an antenna connected to the strain gauge. The tap switching device at the time of the load. 3. The torque detector comprises a strain gauge attached to the surface of the drive shaft for detecting strain caused by the torque, and a transmitter having an antenna connected to the strain gauge, the whole of which is an electromagnetic shielding case. The tap switching device under load according to claim 1, characterized in that it is covered. 4. The load according to any one of claims 1 to 3, wherein a rotation angle detection unit capable of detecting a rotation angle of the shaft is installed on the drive shaft and connected to the torque detector. Tap switching device.