JPH05344035A - Data transmission method near high voltage charge section and abnormal access alarm system to high voltage charge section - Google Patents

Abstract

PURPOSE:To prevent occurrence of noise or error even when data are sent in a radio wave near a high voltage charge section by sending a data signal synchronously with a specific time for increasing and decreasing band of a voltage of the charge section. CONSTITUTION:A voltage induced in a conductor directed toward a charge section direction or a counter charge section direction is detected to check a change in a voltage of a charge section and a data signal is sent in a radio wave synchronously with a period between 1/8-3/8 cycle of a maximum amplitude point of time or between 5/8-7/8 cycle after an increasing and decreasing zone of the voltage of the charge section. That is, since production of corona noise is small for the cycle period in the correlation between the corona noise occurrence time and the amplitude of the voltage of the high voltage charge section, a data error is reduced by sending the data synchronously with the cycle time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a data transmission method in which data noise due to the influence of a high voltage charging unit is extremely small even when data is wirelessly transmitted in the vicinity of a high voltage charging unit of 10,000 volts or more. An abnormal approach warning device for a high-voltage charging unit using a data transmission method is provided.

[0002]

2. Description of the Related Art 1000 train lines, power transmission lines, substations, etc.
There are various problems regarding the data transmission in the vicinity of the high voltage charging part of 0 volt or more. This is because the high-voltage charging section generates a strong electric field distribution around the high-voltage charging section and corona discharge also occurs, which causes noise and errors in the data. And, for example, regarding the measurement data of electric field strength, it is necessary to know the electric field strength accurately for the safety of work when designing and constructing peripheral equipment when performing construction work or repair work near the high voltage charging part. However, in that case, when transmitting the data detected by the electric field sensor to the measurer, it has been conventionally proposed to use an optical fiber cable for the signal line, as seen in JP-A-3-59467.

[0003]

When an optical fiber cable is used as a communication medium in this manner, it is surely advantageous in that it is not affected by corona discharge and that it does not disturb the surrounding electric field, as compared with an electric wire cable for general communication. There is.

However, this kind of electric field measurement is not enough to measure at only one place, and it is necessary to make measurements at a plurality of points. Therefore, moving measurement is required at different measurement points. In view of this point, even an optical fiber cable is "wired", so that the cable interferes with such a mobile measurement in a place where equipment is installed. It can also be an obstacle to work. Moreover, since the optical fiber cable is generally fragile, the cable may be damaged due to movement, so care must be taken in handling, and other wiring work is also inconvenient.

Therefore, it is preferable that the data such as the electric field strength is transmitted by "radio". However, if the general radio system is simply used, there is a problem peculiar to the high voltage charging section as described above, or Since it is a conductor, it disturbs the surrounding electric field and is not preferable for electric field measurement.

[0006]

The present invention has been made in view of such a point, and provides a transmission method in which noise or error hardly occurs even when data is wirelessly transmitted in the vicinity of a high voltage charging section. To solve the problem. Furthermore, the present invention also provides an abnormal approach warning system for a high-voltage charging unit using such a transmission method to improve the safety and workability in the work at the high-voltage charging unit. ..

The inventors first investigated and examined the correlation between the generation time of corona noise in the high-voltage charging section and the amplitude of the voltage of the high-voltage charging section, thereby constructing the following invention.

That is, as claimed in claim 1, after entering the rising and falling zones of the charging section voltage, from 1/8 cycle to 3/8 cycle of the maximum amplitude point, or from 5/8 cycle to 7/8 cycle. In the meantime, there is provided a data transmission method in the vicinity of a high-voltage charging unit, characterized in that a data signal is synchronized and wirelessly transmitted.

According to a second aspect of the present invention, a voltage induced in a conductor directed toward a charging portion or an anti-charging portion, or an oscillating current flowing between other conductors connected to this conductor is detected. Check the change in the charging section voltage by 1 / (1) of the maximum amplitude after entering the rising / falling zone of the charging section voltage.
Data transmission in the vicinity of a high-voltage charging unit, characterized in that data signals are synchronously transmitted wirelessly between 8 cycles and 3/8 cycles or between 5/8 cycles and 7/8 cycles A method is also provided.

Furthermore, in the present invention, as a more specific application using such a transmission method, a system for contributing to the safety of various works near the high-voltage charging section, that is, a signal of an electric field sensor is charged. 3/8 from the 1/8 cycle of the maximum amplitude after entering the rising and falling zones of the section voltage
Up to the cycle, or by wirelessly transmitting in synchronization from the 5/8 cycle to the 7/8 cycle, various alarms are issued to the outside when the receiving side exceeds a predetermined electric field strength. According to a third aspect of the present invention, there is provided a system for alerting an abnormal approach to a high voltage charging unit, which is characterized.

[0011]

[Function] After entering the rising and falling zones of the voltage of the charging section, corona noise is observed between 1/8 cycle and 3/8 cycle or 5/8 cycle and 7/8 cycle of the maximum amplitude point. According to the first aspect, since the data is transmitted in synchronization with this, the data error is extremely small.

According to the present invention, the charging part is detected by detecting the voltage induced in the conductor directed toward the charging part or the anti-charging part or the induced current flowing between other conductors connected to this conductor. Since the change in voltage is checked, the amplitude of the voltage of the charging unit can be detected without directly taking out the voltage signal from the charging unit, and the transmission method as set forth in claim 1 is adopted based on this, resulting in a data error. Can make very small transmissions. Since the amplitude of the voltage of the charging unit can be detected without directly outputting the voltage signal from the charging unit as described above, the wireless data transmitting / receiving system can be easily configured.

According to the third aspect of the present invention, after the measurement signal from the electric field sensor enters the rising and falling zones of the voltage of the charging section, it is from 1/8 cycle to 3/8 cycle of the maximum amplitude time, or 5/5 cycle. Since it is transmitted wirelessly in synchronization from 8th cycle to 7 / 8th cycle, while the receiving side issues an alarm to the outside when the predetermined electric field strength is exceeded, it is extremely accurate and convenient for movement. An abnormal proximity warning system to the high voltage charging part can be configured.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings. This embodiment is an embodiment configured as an abnormal approach warning system for a high-voltage charging section, and FIG. 1 is used in this embodiment. 2 is a front view of the transmitter 1 for transmitting the wireless data, FIG. 2 is a side view of the transmitter 1, and FIG. 3 is a front view of the receiver 2 for receiving the wireless data used in the present embodiment. FIG. 4 also shows the side surfaces of the receiver 2, respectively.

An electric field measuring sensor 3 having a substantially cylindrical outer shape is provided above the transmitter 1, and a battery box 4 is provided below the transmitter 1. The structure of the electric field measuring sensor 3 is as shown in FIG. 5, and the pair of electrodes 5 arranged to face each other on the diameter.
Are arranged in a ring shape to measure the electric field. By arranging a large number in a ring like this, the electric field can be measured in all directions.
The output signals of these electrodes 5 are input to the maximum value selection circuit 6 located at the center of the electric field measuring sensor 3,
Then, the maximum value is selected and transmitted to the signal lines 7 and 8. In FIG. 5, reference numeral 9 is an electrode for the wireless transmission timing circuit, which measures the amplitude of the voltage of the high voltage charging unit and transmits it to the signal line 10. Each of these signal lines 7, 8 and 10 is composed of a fine wire of about 100 microns, and has a very small influence on the electric field distribution near the sensor while being transmitted from the sensor output section to the circuit in the transmitter 1.

The main circuit structure in the transmitter 1 will be described with reference to FIG. 6. The electric field measurement signals from the signal lines 7 and 8 are amplified and converted into digital signals by the digital signal conversion circuit 11. On the other hand, the signal used for timing from the signal line 10 is also amplified, and after a zero cross is detected, a part of the signal is input to the digital signal conversion circuit 11 via the transmission timing generation circuit 12. The electric field measurement signal converted into a digital signal is added with a code, converted from a serial signal into a parallel signal, and input to the transmission circuit 13. The timing instruction signal output from the transmission timing generation circuit 12 is also input to the transmission circuit 13, and the timing instruction signal is transmitted from the antenna 14 after timing with the value of the charging unit voltage.

The timing of this data transmission is, as shown in FIG. 7, from the 1/8 cycle to the 3/8 cycle of the maximum amplitude time after entering the rising and falling zones of the charging section voltage, or 5 /. It is set to perform data transmission in a time between 8 cycles and 7/8 cycles.

The electric field measurement signal thus transmitted wirelessly is received by the receiver 2 and then processed as follows. That is, as shown in FIG. 5, the signal received by the antenna 15 is first converted into a parallel signal to check the code portion, and it is surely confirmed that the data is data from the transmitter 1. .. Then, after appropriately performing data judgment, calculation correction, etc., the electric field intensity is digitally displayed on the display window 16 of the receiver 2 as shown in FIG. 3, and an alarm is displayed when the value is a certain value or more. Is becoming

It is to be noted that the battery box 17 is located below the display window 16 and the transmitter 1 and the receiver 2 do not require a power cord or the like, which is convenient for mobile measurement.

Next, an examination of how much the data error is improved by this embodiment is as follows. First, as in the conventional case, when not synchronized with the charging section voltage, between 1/8 cycle and 3/8 cycle of the maximum amplitude time point, between 5/8 cycle and 7/8 cycle of the maximum amplitude time point, and charging Compared with the case of transmission when the partial voltage was 0, the transmission data was recorded by connecting to the computer by the receiver 2. Data is 1 per second
We decided to check the number of occurrences of data, which seems to be more than 1000 times, by sending and receiving 00 times. The results are shown in Table 1.

[0021]

[Table 1]

As is clear from Table 1, it can be seen that the error rate is very small when the data is transmitted in synchronization with the change in the charging section voltage.

Next, a concrete example of use of this embodiment will be described with reference to FIG. 8.
The work vehicle 20 is provided with the transmitter 1 mounted near the tip of the crane 19 of the unic vehicle 18, while the receiver 2 is located away from the crane 19.
To carry. This way, the crane 1
Whether or not the tip of 9 is abnormally close to the charging part can be immediately determined, work safety is achieved, and it does not interfere with work and is easy to handle.

[0024]

According to the first aspect, the noise error of the transmission data can be extremely reduced. According to the second aspect, the amplitude of the charging unit voltage can be easily detected, and by transmitting based on the amplitude, the data noise error can be extremely reduced. Moreover, since the amplitude of the voltage of the charging unit can be detected without directly extracting the voltage signal from the charging unit, the wireless data transmission / reception system can be easily configured. When both claim 1 and 2 are applied to electric field measurement,
Accurate electric field measurement can be performed without disturbing the surrounding electric field distribution. Moreover, since no transmission cable or the like is required, it is extremely convenient when the electric field sensor is moved when measuring at a plurality of points. According to claim 3, an extremely accurate alarm system can be obtained because it does not disturb the surrounding electric field. Moreover, since no cables or the like are required, it can be used in any place where work is performed, and of course, it does not disturb the work. Also, the mounting location of the sensor and the mounting target can be selected.

[Brief description of drawings]

FIG. 1 is a front view of a transmitter used in an embodiment.

FIG. 2 is a side view of a transmitter used in an example.

FIG. 3 is a front view of a receiver used in an example.

FIG. 4 is a side view of a receiver used in an example.

FIG. 5 is an explanatory plan view showing the configuration of the electric field sensor used in the examples.

FIG. 6 is a block diagram showing a main circuit configuration of a transmitting side and a receiving side in the embodiment.

FIG. 7 is an explanatory diagram showing a transmission timing in the embodiment.

FIG. 8 is an explanatory diagram showing a state in which the embodiment is used for construction near a train line.

[Explanation of symbols]

 1 transmitter 2 receiver 3 electric field sensor 5 electrode 6 maximum value selection circuit 7 signal line 8 signal line 9 electrode for wireless transmission timing circuit 10 signal line 12 transmission timing generation circuit 14 antenna 15 antenna

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Shuichi Yamaguchi 4-83-3 Shibaura, Minato-ku, Tokyo Kandenko Co., Ltd. (72) Inventor Keiji Hibi 4-4-2, Koyodai, Inagi, Tokyo

Claims (3)

[Claims] 1. After entering the rising and falling zones of the charging section voltage, between 1/8 cycle and 3/8 cycle or 5/8 cycle and 7/8 cycle of the maximum amplitude time, A data transmission method in the vicinity of a high-voltage charging unit, characterized in that data signals are synchronized and transmitted by radio. 2. A change in the charging section voltage is detected by detecting a voltage induced in a conductor directed to the charging section or in a direction opposite to the charging section, or an induced current flowing between other conductors connected to this conductor. , After entering the rising and falling bands of the charging section voltage, the data signal is sent during the 1/8 cycle to 3/8 cycle or the 5/8 cycle to 7/8 cycle of the maximum amplitude time point. A method of transmitting data in the vicinity of a high-voltage charging unit, characterized in that the data is transmitted in synchronization with each other by radio. 3. The measurement signal from the electric field sensor is set to 1 / maximum amplitude point after entering the rising and falling zones of the charging section voltage.
Transmitting by radio in synchronization from 8th cycle to 3 / 8th cycle or from 5 / 8th cycle to 7 / 8th cycle, and the receiving side issues an external alarm when the predetermined electric field strength is exceeded. The abnormal approach warning system to the high voltage charging section, which is characterized by the above.