JP2002260120A - Hot line alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot line alarm device capable of generating an alarm sound at a fixed distance even when approaching it from any direction and improving the reliability by suppressing unevenness due to approach angles for a high voltage hot line. SOLUTION: This hot line alarm device consists of an electromagnetic field detector 1 for detecting an electromagnetic field from the high voltage hot line, a microcomputer 5 in which a detection signal from the electromagnetic field detector 1 is inputted, and an alarm means 7 for transmitting an alarm sound by an alarm command outputted from the microcomputer 5 to control the alarm command in accordance with an electromagnetic field level corresponding to a sensing distance from the high voltage hot line and detected by the electromagnetic field detector 1 and monitoring time by the microcomputer 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to provide a warning when a high-voltage live line is approaching a high-voltage current and draw attention to it, and to ensure the safety of electrical construction work and the like near the high-voltage live line. Live alarm.

[0002]

2. Description of the Related Art Heretofore, as a live-line alarm of this type, a worker wearing the alarm has a high-voltage live line (AC6600).
When approaching V), a warning sound is issued when approaching the sensing distance from this high-voltage live line to warn the user to prevent an electric shock accident or the like.

[0003] However, in the conventional live-line alarm, the metal foil attached to the inside of the housing is used as the electromagnetic field detector.
There has been a problem that a difference occurs in an approach angle of a worker, for example, a sensing distance when the worker approaches from below the high-voltage live line and when approaching from a side of the high-voltage live line.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional hot-line alarm, and an object of the present invention is to suppress variations due to an approach angle to a high-voltage hot-line. Accordingly, an object of the present invention is to provide a live-line alarm device that emits an alarm sound at a fixed distance even when approaching from any direction, thereby improving reliability.

[0005]

According to the present invention, there is provided a live-line alarm for detecting an electromagnetic field from a high-voltage live line, a microcomputer to which a detection signal from the electromagnetic-field detector is input, and a microcomputer. The electromagnetic field detector includes an alarm unit that emits an alarm sound according to an alarm command output from the microcomputer. The electromagnetic field detector detects the alarm according to the electromagnetic field level according to the sensing distance from the high-voltage live line and the monitoring time. The command is controlled by a microcomputer. Further, in the above live-line alarm,
In order to prevent erroneous electromagnetic field detection due to the approach angle, the electromagnetic field detector is changed to a box type. The live-line alarm of the present invention is also mounted on a protective cap such as a helmet.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of a circuit of a live-line alarm according to the present invention. Reference numeral 1 denotes an electromagnetic field detector, which receives a high voltage of a commercial frequency (for example, 50 Hz or 60 Hz in Japan). When approaching a high-voltage live line such as a transmission line, an electromagnetic field generated around the high-voltage live line causes the box-shaped electrode of the electromagnetic field detector 1 to receive an electromagnetic induction and generate an AC signal.

[0007] The AC signal generated by the electromagnetic field detector 1 is converted by the filter 2 into an erroneous electromagnetic field caused by a pure electrostatic magnetic field and the commercial frequency (for example, 50 Hz or 60 Hz).
After cutting frequencies (noise) other than z), the amplifier 3
Amplified by Then, it is sent to the voltage comparator 4,
The electromagnetic field level of the AC signal is compared with a predetermined level set in advance, and the determination signal is input to the microcomputer 5.

The microcomputer 5 determines whether the signal is a signal having a corresponding waveform or a noise signal based on the discrimination signal by a programming filter. 7 sounds an alarm sound.

Next, the operation of the live-line alarm of the above embodiment will be described with reference to FIGS. First,
Before performing work in the vicinity of the high-voltage live line 8, it is tested in advance whether or not the electromagnetic field detector 1 functions normally. When the test button provided on the hot-line alarm is pressed, the microcomputer 5
Is initialized, a test signal is emitted from the microcomputer 5 to the electromagnetic field detector 1, and after passing through each functional block, an alarm sounds. On the other hand, if the test button is not pressed, no test signal is emitted,
The device enters the electromagnetic field standby state.

The operation on the high voltage live line 8 is started while maintaining the standby state. As shown in FIG. 2, the live-line alarm of the present embodiment is built in a helmet H worn by an operator. When the helmet H approaches the high-voltage live line 8 and enters the influence of the electromagnetic field, and when the helmet H enters a sensing range (for example, 80 cm) from the high-voltage live line 8, the electromagnetic field detector 1 outputs a commercial frequency AC signal. Occurs. Thereafter, only the target frequency is detected by the filter 2, the signal is amplified by the amplifier 3, and the detection signal is output from the voltage comparator 4. The microcomputer 5 further monitors the input signal for 0.5 seconds to determine whether the detection signal is applicable or a noise signal that is generated irregularly, and a signal based on the commercial frequency is continuously input within the monitoring time. In this case, it is determined that the vehicle has entered the sensing range, the oscillator 6 is operated, and the buzzer 7 emits an alarm sound.

Next, referring to FIGS. 2, 3 and 4, an electromagnetic field detection system of the above-mentioned hot-line alarm will be described. First, the live-line alarm 9 is fixed in a recess of a liner 11 inside a cap body 10 of a helmet H, and furthermore, the liner 11 is sandwiched and fixed between an interior material 12 such as a hammock and the cap body 10. Therefore, the live-line alarm 9 is always fixed to the top of the head, and the electromagnetic field detector 1 has a box-shaped electrode P (book) on the entire inner surface of the upper case 13 of the live-line alarm 9. In the embodiment, the entire inner surface of the upper case 13 is plated.

The electromagnetic field generated from the high-voltage live line 8 is distributed concentrically around the high-voltage live line 8. Since the electromagnetic field is guided to the maximum when the electromagnetic field crosses the electrode perpendicularly, applying an electromagnetic field detector in a box shape makes it possible to control Instead, a stable induction electromagnetic field is always generated.

Since the live-line alarm of the above embodiment is set to operate as described above, when approaching the high-voltage live line 8 from the front as shown in FIG. The same sensing distance is obtained when approaching the high-voltage live line 8 from below as shown in (II) and when approaching the high-voltage live line 8 from behind as shown in (III). (80 cm in this embodiment), an alarm sound is generated.

[0014]

As described above, the alarm command is controlled by the microcomputer in accordance with the electromagnetic field level according to the sensing distance from the high-voltage live line detected by the electromagnetic field detector and the monitoring time. It is possible to control the transmission of the alarm sound so as not to improve the work efficiency and the work accuracy. 2) By making the shape of the electrodes of the electromagnetic field detector box-shaped, it is possible to prevent erroneous electromagnetic field detection due to the approach angle to the high-voltage live line, improve the reliability of the alarm sound, and always provide a stable sensing distance. Performance can be demonstrated.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a live-line alarm of the present invention.

FIG. 2 is an explanatory diagram showing a positional relationship and an approaching direction of a sensing distance between a high-voltage live line and a helmet equipped with a live line alarm.

FIG. 3 is a mounting view of a live-line alarm of the present invention in a helmet.

FIG. 4 is a structural diagram of an electromagnetic field detector of the live-line alarm of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic field detector 2 Filter 3 Amplifier 4 Voltage comparator 5 Microcomputer 6 Oscillator 7 Buzzer 8 High voltage hot wire 9 Hot wire alarm 10 Cap body 11 Liner 12 Interior material 13 Upper case H Helmet P electrode

Continued on the front page (72) Inventor Hideo Taguchi 6-12 Koamicho, Naka-ku, Hiroshima-shi, Hiroshima Inside Chudenko Co., Ltd. (72) Inventor Yuichiro Hoshina 2-8-1 Shintomi, Chuo-ku, Tokyo Inside Tanizawa Seisakusho (72) Inventor Koyo Yamamoto 2-8-1, Shintomi, Chuo-ku, Tokyo F-term in Tanizawa Seisakusho Co., Ltd. (reference) 2F063 AA22 BA10 BA30 BC08 DA05 GA01 5C086 AA53 BA30 CA08 DA01 DA08 EA11 EA17 EA36 EA45 FA02 GA09

Claims (2)

[Claims] 1. An electromagnetic field detector for detecting an electromagnetic field from a high-voltage live line, a microcomputer to which a detection signal from the electromagnetic field detector is input, and an alarm sound generated by an alarm command output from the microcomputer. A warning means configured to control the alarm command by a microcomputer according to an electromagnetic field level corresponding to a sensing distance from the high voltage live line detected by the electromagnetic field detector and a monitoring time. Alarm. 2. The live-line alarm according to claim 1, wherein the electrodes of the electromagnetic field detector are box-shaped.