KR200175148Y1 - Induction voltage monitoring system - Google Patents

Abstract

1. Technical Field

Automatic measurement, telemetry, automatic classification and management of induced voltage induced in communication cable

2. The technical problem that the draft intends to solve

In the conventional measuring method, since the manpower is directly inputted to the problem section, it is necessary to measure for a long time, which causes enormous manpower and waste of time, requires a lot of professional manpower, and also requires several kinds of measuring equipment.

3. Summary of solution of design

Terminal equipment integrates various functions necessary for inductive voltage measurement, installs in various places, and enables measurement, control and analysis in one place through general telephone line.

4. Significant use of the design

It is possible to measure, control, and analyze induced voltage induced in communication cable distributed in a large area in one place, which is convenient for manpower reduction and management.

Description

Automatic measurement and control of induction voltage of communication cable using data communication method {Induction Voltage Monitoring System}

The present invention relates to a comprehensive measurement of noise and induced voltage affecting a communication cable, an unmanned telemetry, and a classification method of the measurement data using the DATA communication method of the present invention. Induction voltage measuring equipment used in existing telephone stations cannot collect and control the data remotely, so the measurement device must move directly to the measuring area and measure it. Due to the capacity limitation of the system, continuous data collection was not possible, which was a waste of time and manpower.

With this in mind, the present invention compensates for the above-mentioned shortcomings and facilitates the measurement, and integrates the functions most used in the measurement to provide a multifunctional product at a low price. It enables the measurement and control to maintain the continuity of pipe measurement and to continuously measure 24/7. It is designed to automatically classify lightning induced voltage and power line induced voltage, which were difficult to classify in existing equipment.

Figure 1. Overall System Schematic

Figure 2. Terminal device configuration diagram

Fig. 3 Circuit Configuration of Terminal Device MAIN Part

Fig. 4 Circuit diagram of terminal device noise measuring unit

Figure 5. Circuit diagram of terminal device induction voltage measurement unit

Referring to the overall configuration of the apparatus, as shown in FIG. 1, the control computer 1a and the main apparatus 1b are installed in a place (telephone station or regional business headquarters) for remote control of all the terminal devices 1d housed therein. The terminal device is installed in the place (telephone station or branch office) where the cable to be measured is connected by the PSTN network 1c, which is a general telephone line, to collect measurement data.

Referring to FIG. 2, the measuring device includes a MAIN unit 2a, a noise voltage measuring unit 2b, an induced voltage measuring unit 2c, and a voltage supply unit 2d, and the MAIN unit includes a noise voltage measuring unit and an induced voltage measurement unit. The measured value is stored in the memory, and the storage method is configured to store the value up to 24 hours before the measurement time. It is configured to maintain the continuity of the measurement once only 24 hours are connected.

Looking at the MAIN part in detail (see Figure 3), CPU (3a), DATA storage (3b), MODEM (3c), LED display (3d), RS232C serial communication port (3e), 8bit parallel communication It consists of CONNECTOR (3f). The operation of the MAIN unit receives the value measured by the noise voltage measuring unit 2b every minute through the RS232C serial communication port 3e and stores it in the memory area allocated for storing the noise voltage measurement value designated as the current time position.

The value measured by the induced voltage measurement unit 2c is transmitted to the 8-bit parallel communication connector 3f every 1 minute and stored in the memory area allocated for storing the induced voltage measurement value designated as the current time position. The data stored in this way is transmitted through the modem (3c) when the transmission request from the main unit (1b) and receives the command from the modem when the main unit (1b) requests a remote control, and analyzes the command code in the CPU (3a) and measures the noise voltage The control unit 2b and the induced voltage measuring unit 2c are controlled. The induced voltage measuring unit 2c (see Fig. 4) includes the resistance attenuators 4a and 4b, the full-wave rectifying units 4c and 4d, the limiter circuits 4e and 4f, the A / D conversion circuits 4g and 4h, and the CPU. (4i), DATA LATCH (4j), DATA transmission connector (4k), and measuring line connection terminal (4l), resistance attenuator is 1/12 attenuator (a) for measuring constant induction voltage (0 ~ 63.5V) And 1/500 attenuator (4b) for measuring abnormal inductive voltage (100V ~ 2,520V).

Referring to the operation of the induced voltage measurement unit, the signal under measurement transmitted through the measurement line connection terminal 4l is divided into 1/12 or 1/500 through the resistance attenuators 4a and 4b. The divided signal is converted into a pulse current signal through the full-wave rectification circuits 4c and 4d, and converted into a digital signal through the A / D converters 4e and 4f and transmitted to the CPU 4i. At this time, when the magnitude of the signal exceeds 5V, the limit is limited to 5V by the limiter circuits 4e and 4f. The transmitted signal is analyzed by the CPU 4i. If the actual value of the constant voltage exceeds 63.5V, the CPU 4i stops the operation of the constant voltage measuring circuits 4a, 4c, 4e, and 4g. Voltage measuring unit By operating (4b, 4d, 4f, 4h), it is possible to simultaneously measure the constant voltage and the abnormal voltage on the same measurement line without changing the range. Induction voltage is divided into power line induced voltage and lightning induced voltage. The classification method is as follows.

In detail analysis of power line induction, most of them have regular periodicity (AC voltage type) and most of lightning induced voltages are impulse type without periodicity. By using this point, the CPU 4i can check the periodicity. If the measured value is periodic, it is judged by the power line induction. If the impulse type is not periodic, it is classified as lightning. Is sent to (2a). The noise voltage measuring unit (see FIG. 5) includes a signal input unit 5a, a channel selection analog S / W 5b, an evaluation filter 5c, a filter selection analog S / W 5d, and a square circuit 5e. ), An A / D converter 5f, an input impedance selection RELAY 5g, a signal input terminal 5h, a control CPU 5i, and an RS232C serial communication port 5j.

Referring to the operation of the noise voltage measuring unit, the signal input to the signal input terminal 5h is removed from the DC component by the signal input unit 5a, and only the AC component is evaluated through the analog S / W 5b for channel selection. 5c) and the evaluation filter is removed to remove the frequency of unnecessary components, and is transmitted to the square circuit (5e) through the filter selection analog S / W (5d) is converted to the effective value. The converted signal is transmitted and stored by the A / D converter 5f to the CPU 5i, and is transmitted through the RS232C serial port 5j when the MAIN unit 2a requests transmission. In addition, when the main device requests the evaluation filter change and the input impedance change, the CPU 5i operates the input impedance selection relay (5g) and the evaluation filter selection analog S / W (5b) to change the measurement method. Four signal inputs (5a, 5k, 5l, 5m) for 0.25 seconds using analog S / W for channel selection High-value evaluation filter (5c), square circuit

(5e) and A / D converter (5f) is designed to reduce the production cost by sharing.

According to the present invention, if a terminal device is installed in the area under measurement, remote control of the measurement method is possible without the need for the measurement personnel to operate directly, and the noise and induced voltage can be continuously measured 24/7. It is very convenient and useful to establish communication cable induction voltage measurement and countermeasure because it can shorten manpower saving and establishment period of induction countermeasure. In addition, since it can replace the existing expensive imported equipment is a useful design with its practicality and economic feasibility.

Claims (1)

This system (see Fig. 1) is installed in the place where the communication main unit 1b and the control computer 1a are remotely controlled, and the terminal unit 1d is installed in the place where the cable to be measured is installed. Control computer 1a for analyzing, storing and outputting data of the terminal equipment Communication main unit 1b for multiple connection of a control computer and a terminal device It consists of a terminal device (1d) for measuring the induced noise and the induced voltage of the communication cable In the terminal device 1d MAIN unit (2a) that manages the storage and communication control of measurement data By selecting the input impedance and the evaluation filter, noise voltages of different measurement methods can be selected. Noise measuring unit 2b capable of measuring on the same line Constant and abnormal voltages, lightning and power line induction can be measured simultaneously on the same line. Possible inductive voltage measuring section (2c) Automatic measurement and control device for communication cable induction voltage using data communication system that enables the measurement and control of induced voltage induced in communication cable through the above devices.