JP2016148564A - Current detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a current detector with which it is possible to easily confirm whether a current is detected and the direction of the detected current.SOLUTION: Provided is a current detector 1 capable of detecting the magnitude and direction of a current flowing in an electric wire 81, the current detector comprising a current detection unit 12 for detecting the magnitude and direction of a current flowing in the electric wire 81 and attached so as to enclose the electric wire 81, an analog meter for indicating the magnitude of a detected current, and two current direction lamps 16 that light up in accordance with the direction of a detected current. The analog meter is disposed at the bottom, and the two current direction lamps 16 are disposed side by side in the longitudinal direction of the electric wire 81 while the current detection unit 12 is attached to the electric wire 81 in such a way that the direction of a current flowing in the electric wire 81 can easily be confirmed by sight.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a current detector capable of easily confirming whether or not a current is detected and the direction of the detected current.

  As a method of searching for an accident point when a ground fault or the like occurs in a distribution line, a high voltage pulse or DC voltage is applied to the section including the accident point separated from the sound section, and a CT receiver or leak ammeter A method for detecting an accident point by detecting an electric current is known, and various proposals have been made to improve workability of the accident point search.

  For example, in order to facilitate the work of bringing the current detectors of the current detector close to the distribution lines, arrange more current detection units than the number of distribution lines side by side with a shorter interval than the distribution lines, In order to facilitate the identification of the current detection unit that has detected the current, each current detection unit is provided with a lamp that lights up when the current is detected. A current detector has been proposed (see, for example, Patent Document 1).

  A current detector is also proposed that detects the current magnitude and direction, sounds a buzzer when the current magnitude exceeds a set threshold, and lights a lamp of a different color according to the current direction. (For example, refer to Patent Document 2).

JP, 2014-16321, A JP 2003-35740 A

  According to the current detectors described in Patent Documents 1 and 2, the workability of the accident point search is improved, and since the lamp is provided on the bottom surface, it can be easily seen from below that the current has been detected. it can. However, in the current detector described in Patent Document 2, the method of determining the direction of the current based on the difference in lamp color is not intuitive.

  In recent years, the magnitude of the ground fault current flowing at the point of the accident is often small due to the improvement of the quality of insulators and the like. In addition, the ground fault current may be reduced due to a shunt. When the ground fault current is small, the ground fault current is amplified by increasing the voltage to be applied. However, in order to increase the voltage to be applied, it is necessary to disconnect the high voltage cable, which takes time. . Also, depending on the situation, the applied voltage may not be increased, and the current detectors described in Patent Documents 1 and 2 cannot detect a current less than a threshold value, and thus cannot detect a ground fault current. There is a case.

  An object of the present invention is to provide a current detector capable of easily confirming whether or not a current is detected and the direction of the detected current.

  The present invention is a current detector capable of detecting the magnitude and direction of a current flowing through an electric wire, wherein the current detector is attached to the electric wire so as to surround the electric wire and detects the magnitude and direction of the electric current flowing through the electric wire. A unit, an analog meter that indicates the magnitude of the detected current, and two current direction lamps that light according to the direction of the detected current, the analog meter being disposed on the bottom surface, The current direction lamp is arranged so that the direction of the current flowing through the electric wire can be easily visually recognized, and the current detection unit is arranged in the major axis direction of the electric wire in a state of being attached to the electric wire. This is a featured current detector.

  In addition, the current detector of the present invention further includes illumination means for improving the illuminance of the analog meter.

  Furthermore, the current detector of the present invention further includes a current detection lamp disposed on the bottom surface and / or a magnitude of the detected current that is lit when the magnitude of the detected current exceeds a preset magnitude. A current detection buzzer that rings when the value exceeds a preset size is provided.

  In the current detector of the present invention, the analog meter has a scale plate with a plurality of scales, and the scale corresponding to the magnitude of the current detected by the current detection unit among the plurality of scales. An indicator needle for indicating is provided, and the magnitude of the current corresponding to each scale can be arbitrarily set.

  The current detector of the present invention further includes a joint that is detachably connected to the end of a long insulating operation rod used for indirect hot-wire work, and the current detection unit includes a rotatable rotating piece. The rotating operation piece is pressed against the electric wire by operating the insulating operation rod in a state of being connected to the tip of the insulating operation rod, and the current detecting unit is attached to the electric wire. It is characterized by being detachable.

  According to the current detector of the present invention, the presence or absence of current detection can be confirmed from the movement of the analog meter. Therefore, the movement of the analog meter can be detected even when the current is less than the set threshold or when the current flows instantaneously. By checking, it can be confirmed whether or not current is detected. Moreover, since the analog meter is disposed on the bottom surface, it is easy to check the analog meter from the operator side when it is attached to an electric wire installed at a high place or in the ground. Furthermore, since two current direction lamps are provided and the current direction lamps are turned on according to the detected current direction, the detected current direction can be intuitively determined. Thus, according to the current detector of the present invention, the presence / absence of current detection and the direction of the detected current can be easily confirmed.

1 is a perspective view of a current detector 1 according to a first embodiment of the present invention. It is a side view of the current detector 1 of FIG. It is a bottom view of the current detector 1 of FIG. FIG. 2 is a perspective view showing an operation when the current detector 1 of FIG. It is a perspective view of the current detector 2 of the second embodiment of the present invention.

  FIG. 1 is a perspective view of a current detector 1 according to a first embodiment of the present invention. FIG. 2 is a side view of the current detector 1 of FIG. FIG. 3 is a bottom view of the current detector 1 of FIG. 4A is a perspective view showing an operation when the current detector 1 of FIG. FIG. 4B is a perspective view showing an operation when the current detector 1 of FIG. The current detector 1 of the present invention is a current detector that detects the magnitude and direction of the current flowing through the electric wire 81, and is used for searching for an accident point when a ground fault or the like occurs in the distribution line.

  The current detector 1 includes a rectangular parallelepiped housing 11, a current detection unit 12 disposed on the top of the housing 11, an analog meter 13, a current detection lamp 14, and a current disposed on the bottom surface of the housing 11. A detection buzzer 15, current direction lamps 16 and 17 disposed one on the front and the back of the housing 11, and a long insulation disposed in the lower part of the back of the housing 11 and used for indirect hot-line work. The joint 18 for connecting the operation rod 91, control means (not shown) housed in the housing 11, a power source, and other operation buttons, a liquid crystal display unit, and the like as necessary are provided on the electric wire 81 via the current detection unit 12. The magnitude and direction of the current that is attached and flows through the electric wire 81 is detected.

  The casing 11 is a box made of synthetic resin, and is formed in a portable size that accommodates a current detection unit 12, an analog meter 13, a current detection lamp 14, a current detection buzzer 15, control means, a power source, and the like. Yes. In addition, the material of the housing | casing 11 is not limited to a specific material, It is preferable that it is a lightweight material, ensuring intensity | strength.

  In addition, a groove 21 is formed in the upper portion of the housing 11 to be fitted when a rotating piece 32 of a current detection unit 12 described later rotates inside the current detection unit 12.

  The current detection unit 12 is a Hall element type current detection means for detecting a magnetic field generated around the current flowing in the electric wire 81 using the Hall effect, and is fixed to the upper part of the housing 11 and is C in front view. The ring-shaped fixed piece 31 and a rectangular parallelepiped block-like turning piece 32 attached to the upper portion of the housing 11 are configured in a ring shape, and are attached to the electric wire 81 so as to surround the electric wire 81. The magnitude and direction of the current flowing through the current are detected. The current detection unit 12 is not limited to the current detection means using the Hall effect, and other types of current detection means capable of detecting the magnitude and direction of the current can be used.

  The fixed piece 31 and the rotating piece 32 are formed so as to cover a magnetic field detecting means (not shown) such as an iron core including a Hall element that detects a magnetic field generated around the current due to the Hall effect with a synthetic resin.

  The rotating piece 32 is erected at right angles to the upper surface of the casing 11 by a biasing force of a spring (not shown) so as to be rotatable inward and outward of the ring of the current detection unit 12 and in a ring shape with the fixed piece 31. It is attached to the housing 11 via a shaft 22 that serves as a rotation shaft so as to be connected.

  The analog meter 13 is an analog meter that indicates the scale 40 of the scale display 41 with a scale 40 from 0 to 5 with the indicating needle 42, and the magnitude of the current detected by the current detection unit 12. The indicator needle 42 continuously indicates the scale 40 according to the movement.

  In the analog meter 13, the magnitude of the current corresponding to each scale 40 of the scale board 41 can be set to an arbitrary magnitude. For example, when the magnitude of the current detected by the current detection unit 12 is 0.67 A, a scale 40 of “5” is indicated, and when the magnitude of the current is 0.34 A, a scale 40 of “3” is indicated. The difference in current value between the scales 40 does not necessarily have to be equal.

  The scale plate 41 of the analog meter 13 is not limited to the 5-level display, and may be a 10-level display, for example. In addition, the scale plate 41 of the analog meter 13 includes a backlight 43 that is an illuminating unit that improves the illuminance so that the illuminance can be visually recognized even in a dark place.

  The indicator needle 42 of the analog meter 13 is configured to move following the magnitude of the current detected by the current detection unit 12. Further, the analog meter 13 may be provided with a placement needle (not shown) that is hooked on the indicator needle 42 and holds the maximum value indicated by the indicator needle 42.

  The current detection lamp 14 is turned on when the magnitude of the current detected by the current detection unit 12 exceeds a preset threshold value. The threshold value can be arbitrarily set. For example, when the magnitude of the current corresponding to the scale 40 of “5” of the analog meter 13 is set to be the same as that of the indicator needle 42 of the analog meter 13, The current detection lamp 14 is turned on when the scale 40 of “5” is instructed. Note that the emission color of the current detection lamp 14 is not limited to a specific color.

  Further, the timing for turning off the current detection lamp 14 may be set to an optimal timing as appropriate, for example, after a certain period of time has passed, or when the operation button is turned off. The same applies to a current detection buzzer 15 and current direction lamps 16 and 17 to be described later.

  The current detection buzzer 15 sounds when the magnitude of the current detected by the current detection unit 12 exceeds a preset threshold value. The threshold value is basically set to the same value as the threshold value of the current detection lamp 14, but is not limited to this.

  The current direction lamps 16 and 17 are arranged and detected one by one on the front surface and the rear surface of the housing 11 so that the current detection units 12 are attached to the electric wire 81 and aligned in the long axis direction of the electric wire 81. The current direction lamps 16 and 17 located on the upstream side in the current flow direction are turned on. As shown in FIG. 1, when the current detected by the current detection unit 12 is flowing toward the front surface of the housing 11, the current direction lamp 16 disposed on the front surface of the housing 11 is turned on. On the other hand, when the current detected by the current detection unit 12 is flowing toward the back surface of the housing 11, the current direction lamp 17 disposed on the back surface of the housing 11 is turned on. Note that the magnitude of the current that the current direction lamps 16 and 17 are lit can be set to an arbitrary magnitude as in the case of the current detection lamp 14.

  The emission colors of the current direction lamps 16 and 17 are not limited to specific colors, but are preferably different from each other in order to make it easier to determine the direction of the detected current.

  The joint 18 includes a locking groove 51 that locks a pin 92 provided at the tip of a long insulating operation rod 91 used for indirect hot-wire work, and is a so-called twist that is detachably connected to the insulating operation rod 91. It is a connection means of a lock mechanism.

  Based on the input from the current detection unit 12 and the operation buttons, and the current value corresponding to the set threshold value and each scale 40, the control means is the indicator needle 42, the backlight 43, the current detection lamp 14, the current of the analog meter 13. The detection buzzer 15 and the current direction lamps 16 and 17 are operated. In addition, since a well-known thing should just be used for a control means, a power supply, an operation button, etc., detailed description is abbreviate | omitted.

  Next, an accident point search method using the current detector 1 of the present embodiment will be described. The current detector 1 is connected to the tip of the insulation operation rod 91, and the insulation operation rod 91 is operated to attach the current detector 1 (current detection unit 12) to the electric wire 81. When the current detector 1 is attached to the electric wire 81, the rotating piece 32 of the current detecting unit 12 is pressed against the electric wire 81 and the rotating piece 32 is turned inward so that the electric current detector 1 is easily attached to the electric wire 81. Can be installed.

  With the current detector 1 attached to the electric wire 81, a high voltage pulse or a direct current voltage is applied to the electric wire 81 by a voltage applying device (not shown). When an accident point is included in the electric wire 81 to which the current detector 1 is attached, the current detector 1 detects a ground fault current, and the indicator needle 42 indicates a scale 40 corresponding to the magnitude of the ground fault current. Depending on the direction of the ground fault current, the front current direction lamp 16 or the rear current direction lamp 17 is lit.

  Further, if the detected magnitude of the ground fault current is equal to or greater than the set threshold value, the current detection lamp 14 is turned on and the current detection buzzer 15 is sounded. The operator checks the operation of the analog meter 13, the current detection lamp 14, the current detection buzzer 15, and the current direction lamps 16 and 17 to determine the presence and direction of the ground fault current and narrow down the accident point.

  When the current detector 1 is removed from the electric wire 81, the insulation operating rod 91 is operated to press the rotating piece 32 of the current detecting unit 12 against the electric wire 81 and rotate the rotating piece 32 outward. 1 can be easily removed from the electric wire 81.

  As described above, the current detector 1 according to the present embodiment includes the current direction lamps 16 and 17 disposed on the front surface and the back surface, and the current direction lamp 16 and the current direction lamp 16 positioned on the upstream side in the detected current flow direction. Since 17 lights up, the direction of the detected current can be determined intuitively.

  In addition, the current detector 1 can easily detect that the current has been detected because the current detection lamp 14 is lit and the current detection buzzer 15 sounds when the magnitude of the detected current is equal to or greater than the set threshold value. Can be confirmed.

  Furthermore, since the current detector 1 includes the analog meter 13, even when the ground fault current flowing in the electric wire 81 is reduced due to the shunting or the like, and the magnitude of the current detected by the current detection unit 12 is less than the set threshold value. By confirming the operation of the indicator needle 42, it can be confirmed whether or not a current is detected. As a result, it is possible to detect a ground fault current without increasing the output voltage of the voltage applying device, so that it is not necessary to disconnect the high voltage line to increase the output voltage, and the accident point search operation can be performed quickly. .

  In addition, in a digital meter, it is difficult to determine whether or not a numerical value is displayed for a current that flows instantaneously, and it is difficult to check whether or not a current is detected. Thus, the presence or absence of current detection can be confirmed by confirming the operation of the indicator needle 42 even with respect to the instantaneously flowing current.

  In the current detector 1, since the analog meter 13 and the current detection lamp 14 are provided on the bottom surface of the housing 11, the current detector 1 can be easily seen from below. Further, since the analog meter 13 includes the backlight 43, it can be visually recognized even in a dark place. In order to further improve the visibility of the analog meter 13, for example, a magnifying glass (not shown) may be provided.

  In addition, since the current detector 1 includes the rotating piece 32 in the current detection unit 12, the current detector 1 can be easily attached to and detached from the electric wire 81 even in indirect hot wire work using the insulating operation rod 91.

  FIG. 5 is a perspective view of the current detector 2 according to the second embodiment of the present invention. The same components as those of the current detector 1 of the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof is omitted. The current detector 2 of the present embodiment has the same basic configuration as the current detector 1 of the first embodiment, but the housing 61 is configured to be extendable and contractible.

  The casing 61 of the current detector 2 of the present embodiment is configured to expand and contract in four steps in the vertical direction by stacking a configuration in which a small rectangular tube is accommodated in the vertical direction inside the rectangular cylinder. It is comprised and expand | extends by pulling the innermost square cylinder 63 below. The outermost rectangular tube 62 has a ceiling surface, includes the current detection unit 12 at the top, and includes current direction lamps 16 and 17 at the front and back surfaces. The innermost rectangular tube 63 has a bottom surface, and includes an analog meter 13, a current detection lamp 14, and a current detection buzzer 15 on the bottom surface, and a joint 18 on the lower portion of the back surface.

  According to the current detector 2 of the present embodiment, it is possible to extend the housing 61 by connecting the insulating operation rod 91 to the joint 18 and pulling the innermost rectangular cylinder 63 downward. The current detection lamp 14 and the current detection buzzer 15 can be brought closer to the worker. Thereby, the visibility of the analog meter 13 and the current detection lamp 14 and the audibility of the current detection buzzer 15 are improved.

  In consideration of the load applied to the electric wire 81, it is preferable that the force required when the casing 61 is expanded and contracted is not too large, and it may be configured to extend by its own weight of the rectangular tube. Further, the number of stages in which the casing 61 can be expanded and contracted is not limited to a specific number of stages.

  As described above, the current detector according to the present invention has been described using the current detectors 1 and 2 according to the first and second embodiments. However, the current detector according to the present invention is not limited to the above-described embodiments, and is summarized. It is possible to deform within a range not changing. In addition, the current detector of the present invention is not limited to the electric wire 81 installed at a high place, and can be used, for example, to detect a current flowing in an electric wire (not shown) embedded in the ground.

  As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification. Therefore, such changes and modifications are interpreted as being within the scope of the invention defined by the claims.

DESCRIPTION OF SYMBOLS 1 Current detector 12 Current detection unit 13 Analog meter 14 Current detection lamp 15 Current detection buzzer 16, 17 Current direction lamp 18 Joint 32 Turning piece 40 Scale 41 Scale board 42 Indicator needle 43 Backlight 81 Electric wire 91 Insulation operation rod

Claims (5)

A current detector capable of detecting the magnitude and direction of a current flowing through an electric wire;
A current detection unit that is attached to the wire so as to surround the wire and detects the magnitude and direction of the current flowing through the wire;
An analog meter that indicates the magnitude of the detected current;
Two current direction lamps that light according to the direction of the detected current,
The analog meter is disposed on the bottom surface,
The two current direction lamps are arranged so that the direction of the current flowing through the electric wire can be easily visually recognized, and the current detection units are arranged in the major axis direction of the electric wire in a state of being attached to the electric wire. A current detector.   The current detector according to claim 1, further comprising illumination means for improving illuminance of the analog meter.   Further, a current detection lamp disposed on the bottom surface that lights up when the magnitude of the detected current exceeds a preset magnitude, and / or the magnitude of the detected current that is preset. The current detector according to claim 1, further comprising a current detection buzzer that rings when exceeded. The analog meter includes a scale plate with a plurality of scales, and an indicator needle that indicates the scale corresponding to the magnitude of the current detected by the current detection unit among the scales.
The current detector according to any one of claims 1 to 3, wherein a magnitude of a current corresponding to each scale can be arbitrarily set. Furthermore, it is equipped with a joint that is detachably connected to the tip of a long insulating operation rod used for indirect hot-wire work,
The current detection unit has a rotatable turning piece,
The rotating piece is rotated by pressing the rotating piece against the electric wire by operating the insulating operating rod in a state connected to the tip of the insulating operating rod, and the current detection unit can be attached to and detached from the electric wire. The current detector according to claim 1, wherein the current detector is a current detector.

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