JPH05180873A - Measuring device for high-voltage part - Google Patents

Abstract

PURPOSE:To improve the reliability of measurement by controlling the transmission loss of light so as to be small even if an insulating bar bends, and to eliminate the error of the measurement by preventing disturbance light such as sunlight from entering inside the insulating bar. CONSTITUTION:When a hook 2 is brought into contact with a transmission line 1, voltage is converted into a signal suited to phototransmission in a sensor section 3 to drive plural number of light emitting devices 4. Light sent out of the light emitting device 4 propagates through a space transmitting path 10 in an insulating bar 5, and arrives at plural number of light receivers 7. An optical signal is converted into an electric signal in the light receiver 7, and the electric signal is converted into voltage value in a display section 8 to display it there. In the case where the light emitting device 4 and the lighter receiver 7 are plurally arranged in the insulating bar 5, a straight path is secured by any set of them even if the insulating bar 5 bends. On the other hand, the optical signal sent out of the light emitting device 4 is received by the light receiver 7, but when the insulating bar 5 is provided with a light shielding cover 6 on the side of the light receiver 7, the effect of such disturbance light can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage part measuring device for measuring a physical quantity of a high voltage part such as a power transmission line or a substation bus, and particularly, by converting the physical quantity of the high voltage part into an optical signal once. The present invention relates to a measuring device that transmits to a ground potential section.

[0002]

2. Description of the Related Art Generally, when temporarily measuring physical quantities such as voltage, current and temperature in high voltage parts such as transmission lines and substation busbars, a sensor is attached to the end of a long insulating rod and the Approach or contact the voltage section. Then, the output information of the sensor is converted into a signal of light, sound, radio or the like, propagated through a highly insulating medium such as space or optical fiber, and transmitted to the ground potential portion. Conventionally, as one of these means, there is a device that converts a sensor output into an optical signal, propagates it through an optical fiber or a hollow insulating rod, and transmits it to a ground potential portion. In this type of device, when a flashover occurs due to contact with a high-voltage portion, not only a power failure but also an operator's life is concerned, so that the insulating medium is required to have high electrical insulation. In this sense, the hollow insulating rod has higher insulation than the solid optical fiber, so the method of transmitting light inside the hollow insulating rod is
Better than devices that use optical fibers.

[0003]

However, the above-mentioned method of transmitting light through the hollow insulating rod is not a problem when the long insulating rod remains straight, but is optimal when it bends. In order to obtain the coupling efficiency, the light emitting device and the light receiving device, which have been on the same straight line until then, are deviated from the straight line, so that there is a problem that the transmission loss of light becomes large and the reliability of measurement is deteriorated. There is also a problem that ambient light such as the sun is transmitted through the insulating rod and mixed with an optical signal, which leads to an error in measurement.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a high voltage part measuring device capable of reliably transmitting information of the high voltage part.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a hollow insulating rod having a space transmission path for transmitting light therein and a physical quantity of the high voltage portion when the high voltage portion is provided at the tip of the insulating rod are approached. Sensor, a transmitter that sends out an optical signal corresponding to the physical quantity to the space transmission line, and a receiver that receives an optical signal from the transmitter installed at the base end of the insulating rod and transmitted through the space transmission line. And a high voltage section measuring device having a section. Further, a plurality of sets of the transmitter and the receiver are provided so that a linear path of an optical signal composed of the transmitter and the receiver is secured in the space transmission path when the insulating rod is bent. The straight line path is an optical path that connects the transmitting unit and the receiving unit with a straight line without any obstacle between them.

The plurality of sets of the transmitting unit and the receiving unit include the case where the number of transmitting units and the number of receiving units are the same, and the case where the number of transmitting units and the number of receiving units are different. When the numbers are the same, the following modes are included. That is, when the insulating rod is not deflected, all pairs of straight paths are secured, and when the insulating rod is deflected, some pairs of straight paths are secured. This is the case when straight paths are not ensured but they are only formed when the insulating rod is bent. When the numbers are different, the following modes are included. That is, when the number of transmitters is greater than the number of receivers and the receivers are shared, on the contrary, the number of receivers is greater than the number of transmitters and the transmitters are shared,
In these cases, the straight path formation before and after the insulating rod bends,
It is similar to the case of the same number.

In particular, in order to block noise due to ambient light, it is preferable that at least the receiving portion side of the insulating rod is made of a light shielding member. In this case, the insulating rod itself may be used as the light shielding member, or the insulating rod may be covered with the light shielding member. The reason for "at least" is as follows. That is, although it is originally preferable to have a light-shielding property over the entire length, a member having a high insulating property has a poor light-shielding property. However, if the member is thick, the insulating property becomes poor, and the member becomes heavy and the operability becomes poor. Therefore, it is sufficient to make at least the light-shielding property on the side of the receiving unit that is particularly affected by the ambient light.

[0008]

If a plurality of sets of transmitters and receivers are provided and a plurality of optical signal linear paths are secured in the space transmission path, the probability that all linear paths will be cut off at the same time even if the insulating rod bends Is significantly reduced, and there is a high possibility that some transmission / reception paths will remain or a new path will be formed, resulting in less optical transmission loss.

Further, if at least the receiving portion side of the insulating rod is shielded from the outside, an optical signal that is strongly influenced by the ambient light at the receiving portion rather than at the transmitting portion due to attenuation or the like is not affected by the ambient light. Therefore, the transmission error due to the entry of ambient light is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a voltage measuring device as a high voltage part measuring device according to the present embodiment when a physical quantity is a voltage. In FIG. 1, 1 is a power transmission line as a high voltage part. Reference numeral 2 denotes a contact hook, which is hooked on the power transmission line 1 to hold the voltage measuring device in a hanging state. Reference numeral 3 denotes a sensor that detects the voltage, and detects the voltage of the power transmission line 1 from the hook 2 hooked on the power transmission line 1. The hook 2 and the sensor 3 constitute a sensor portion of the present invention, and the sensor portion is an insulating rod 5.
Is provided at the tip of. Reference numeral 4 denotes a light emitter that converts a voltage into light, and sends an optical signal corresponding to the detection voltage of the sensor 3 to the space transmission line 10. Reference numeral 5 denotes a hollow insulating rod forming a space transmission line, which has a straight shape when it is not bent, and its material is, for example, FRP (Fiber Reinforced Plastics). Reference numeral 7 denotes a photodetector for converting light into an electric signal, which is provided at the base end of the insulating rod 5 serving as the ground potential portion, and is connected to the space transmission line 10.
The optical signal from the light emitter 4 is transmitted. 8
Is a display unit for receiving the signal from the light receiver 7 and displaying the voltage value detected by the sensor unit.

Here, as shown in the figure, the light emitter 4 and the light receiver 7 are not one set, but a plurality of transmission / reception linear paths for optical signals are provided in the spatial transmission line 10. Therefore, the light emitter 4 and the light receiver 7 are provided. Provide a plurality of each. FIG. 2 shows an example of the arrangement of the light emitter 4 and the light receiver 7 when a plurality of such light sources are provided. The light emitters 4 and the light receivers 7 face each other by the same number (four in the illustrated example) so as to overlap each other in a plan view, and are arranged in the circumferential direction along the inner wall of the insulating rod 5. The reason for arranging along the inner wall is that it is expected that the probability of securing a straight path at the time of bending is higher than that at the center. In order to ensure transmission / reception, it is preferable that the optical signal sent from the light emitting device 4 is focused into a beam by a commonly used optical method. Also,
A light emitting diode can be used as the light emitting device, and a photodiode or a phototransistor can be used as the light receiving device.

On the other hand, reference numeral 6 in FIG. 1 denotes a cover for blocking external light, which is provided as necessary and has a light-shielding property at least on the light-receiving side of the insulating rod 5. The material of the cover is rubber, for example. The cover 6 for blocking ambient light is, for example, 30c from the light receiver 7 toward the light emitter 4 side.
It can be covered with a heat-shrinkable tube having a height of about m and a wall thickness of about 1 mm. If it is about 30 cm, it is just a region where the operator grips the insulating rod 5, and therefore the region is only a small portion of the entire length of the insulating rod 5, and the cover does not impair the insulating property.

In the above structure, when the hook 2 is brought into contact with the power transmission line 1, the sensor unit 3 converts the voltage into a signal suitable for optical transmission and drives the light emitter 4. Light emitter 4
The light emitted from the light propagates through the space transmission path 10 of the insulating rod 5 and reaches the light receiver 7. The light receiver 7 converts the optical signal into an electric signal, and the display unit 8 converts the electric signal into a voltage value for display.

Here, by disposing a plurality of the light emitters 4 and the light receivers 7 along the inner surface of the insulating rod 5 as described above, it is possible to reduce the optical transmission loss due to the bending of the insulating rod 5. .. This principle will be described with reference to FIG.
FIG. 3 shows a state in which the light emitters A and B are attached to the left and right ends of the tip and the insulating rods 5 to which the light receivers B and C are attached to the left and right ends of the base end are bent. In the straight state before bending, it is assumed that the light emitter A and the light receiver C are connected by a straight line and the light emitter B and the light receiver D are connected by a straight line, and these are combined to form two straight line paths. When bending as shown in the figure, looking at the light-emitting device B and the light-receiving device D, it is impossible to go directly from the light-emitting device B to the light-receiving device D due to the straightness of light as shown by the dotted line. Will be reflected and propagated. However, the light emitter A
Regarding the light receiving device C and the light receiving device C, the light directly propagates from the light emitting device A to the light receiving device C, and the propagation loss of the light becomes extremely small.

On the other hand, light such as sunlight outside the insulating rod slightly enters the insulating rod and adversely affects the optical signal. Especially, the influence of ambient light entering from the vicinity of the light receiver 7 is great. Therefore,
When the light-shielding cover 6 is provided on the side of the light receiver 7 as in this embodiment, the influence of such disturbance light can be cut off. Therefore, the ambient light such as the sun is not transmitted through the insulating rod and mixed with the optical signal to cause a measurement error.

As described above, according to this embodiment, the transmission loss of light due to the bending of the insulating rod can be reduced by devising the mounting position and the number of the light emitters or the light receivers.
On the other hand, by installing a cover that blocks ambient light, it is possible to reduce transmission errors due to the entry of ambient light.

Although the same number of light emitting devices and light receiving devices are arranged along the inner surface of the insulating rod in the above-described embodiment, the present invention is not limited to this. For example, although a plurality of light emitters are provided along the inner surface of the insulating rod, one light receiver is provided at the center of the insulating rod, and conversely, one light emitter is provided at the center of the insulating rod and the light receiver is provided at the other end of the insulating rod. You may make it arrange | position a plurality along an inner surface. Further, instead of the light-shielding cover, a portion including the relevant portion of the insulating rod 5 may be made of a light-shielding substance that prevents sunlight from entering. In that case, as a light-shielding substance, carbon black or titanium foil mixed with F
RP and the like are preferable. Further, it goes without saying that the high voltage section is not limited to the power transmission line.

[0018]

According to the present invention, the transmission loss due to the bending of the insulating rod can be reduced by installing a plurality of sets of the transmitting unit and the receiving unit in the insulating rod. In particular, when a cover that blocks ambient light is installed on the side of the receiving unit where the influence of ambient light is strongest, the transmission error due to the intrusion of ambient light can be further reduced. Therefore, the reliability of information transmission from the high voltage portion to the ground potential portion is improved, and the reliability of the high voltage portion measuring device can be improved.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a high voltage part measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing the arrangement of an insulating rod and a light emitting device or an insulating rod and a light receiving device of this embodiment.

FIG. 3 is an explanatory diagram of a transmission / reception path due to the arrangement of a light receiver and a light emitter when the insulating rod of this embodiment is bent.

[Explanation of symbols]

 1 Transmission line 2 Hook 3 Sensor part 4 Light emitter 5 Insulating rod 6 Light-shielding cover 7 Light receiver 8 Display part 10 Spatial transmission line

Claims (2)

[Claims] 1. A hollow insulating rod having a space transmission path for transmitting light therein, and a sensor portion provided at the tip of the insulating rod for detecting a physical quantity of the high voltage portion when the high voltage portion is approached. A transmitter for transmitting an optical signal corresponding to the physical quantity to the spatial transmission line; and a receiver for receiving the optical signal from the transmitter provided at the base end of the insulating rod and transmitted through the spatial transmission line. In the high-voltage part measuring device having the above-mentioned transmitter so that a linear path of an optical signal composed of the transmitter and the receiver is secured in the space transmission path when the insulating rod is bent, A high-voltage part measuring device comprising a plurality of sets of the above-mentioned receiving parts. 2. The high-voltage measuring device according to claim 1, wherein at least the receiving portion side of the insulating rod has a light-shielding property for cutting off light from the outside.