CN103762577A - Communication line thunder prevention device - Google Patents

Abstract

The invention relates to a lightning protection device for communication lines, which is characterized in that: the lightning protection module is provided with a first-level and a second-level lightning protection circuit, the first-level lightning protection circuit adopts TED485 lightning protection tube, and the second-level lightning protection circuit adopts TVS The realization of detonator, among them, FL is TED485 detonator, TS is TVS detonator, the connection relationship is: TED485 detonator FL1, TED485 detonator FL2, TVS detonator TS1 and TVS detonator TS3 positive pole Connected and grounded, the negative pole of TED485 anti-detonator FL1, TVS anti-detonator TS1 and the positive pole of TVS anti-detonator TS2 are connected to the 485A terminal, and the terminals of TVS anti-detonator TS2, TVS anti-detonator TS3 and TED485 anti-detonator FL2 The negative pole is connected to the 485B terminal; the whole circuit is enclosed in the PVC material shell (1); the present invention adopts the method of connecting to the RS-485 bus in parallel, and only needs to connect the lightning protection module to the 485 terminal without affecting the concentration The ability of the meter reading terminal to communicate and carry loads effectively improves the terminal’s anti-sensing lightning capability and ensures the safe and stable operation of the terminal during the thunderstorm season.

Description

Communication Line SPD

technical field

The invention belongs to the technical field of electrical components, and in particular relates to a communication line lightning protection device for lightning protection, anti-surge protection, anti-static protection, and anti-overvoltage protection for 485 communication, data control, data acquisition, and signal lines.

Background technique

The electromagnetic pulse overvoltage and overcurrent caused by lightning discharge will damage the signal equipment through the power system, signal transmission channel and other channels. In the past, only lightning rods and lightning arresters were installed on buildings, which can only prevent direct lightning from damaging buildings and antennas, but cannot ensure that surrounding communication equipment is not struck by lightning, because the above lightning protection facilities cannot prevent electrostatic induction, electric current, etc. Magnetic induction is harmful to lines and equipment.

Contents of the invention

The object of the present invention is to provide a lightning protection device for communication lines that can be used for lightning protection, anti-surge protection, anti-static protection, and anti-overvoltage protection of 485 communication, data control, data acquisition, and signal lines. The technical solution adopted to realize the object of the present invention is: a communication line lightning protection device, which is characterized in that: the communication line lightning protection device is provided with a first-level and a second-level two-level lightning protection circuit, and the first-level lightning protection circuit adopts TED485 The detonator is realized, and the secondary lightning protection circuit is realized by TVS detonator. Among them, FL is TED485 detonator, and TS is TVS detonator. The connection relationship is: TED485 detonator FL1, TED485 detonator FL2, TVS The positive poles of the anti-detonator TS1 and TVS anti-detonator TS3 are connected and grounded, the negative poles of TED485 anti-detonator FL1 and TVS TS1 are connected with the positive poles of TVS anti-detonator TS2 as 485A terminals, and the positive poles of TVS anti-detonator TS2, The negative poles of TVS anti-detonation tube TS3 and TED485 anti-detonation tube FL2 are connected to the 485B terminal; the whole circuit is enclosed in the shell of PVC material.

The invention has good sealing performance, dust-proof and anti-corrosion function, high reliability, convenient installation, small size and light weight, adopts parallel connection to RS-485 bus mode, and only needs to connect the lightning protection module to the 485 terminal. It does not affect the communication and load capacity of the centralized meter reading terminal, effectively improves the anti-sensing lightning capability of the terminal, and ensures the safe and stable operation of the terminal in the thunderstorm season.

Description of drawings

Fig. 1 is the outline structure schematic diagram of the present invention;

Fig. 2 is a schematic diagram of circuit structure of the present invention;

Fig. 3 is a schematic diagram of the connection of the present invention on the communication line.

In the figure, 1, shell, 2, ground wire, 3, 485A terminal, 4, 485B terminal; among them, FL is TED485 detonator, TS is TVS detonator.

Detailed ways

Referring to the accompanying drawings, a communication line lightning protection device is characterized in that: the communication line lightning protection device is provided with a first-level and a second-level lightning protection circuit, the first-level lightning protection circuit is realized by a TED485 lightning protection tube, and the second-level lightning protection circuit The circuit is realized by TVS detonator, among which, FL is TED485 detonator, TS is TVS detonator, the connection relationship is: TED485 detonator FL1, TED485 detonator FL2, TVS detonator TS1 and TVS detonator The positive poles of tube TS3 are connected and grounded, the negative poles of TED485 anti-detonator FL1 and TVS anti-detonator TS1 are connected with the positive poles of TVS anti-detonator TS2 as 485A terminal, TVS anti-detonator TS2, TVS anti-detonator TS3 and TED485 anti-detonator The negative electrode of the detonator FL2 is connected to the 485B terminal; the circuit is entirely enclosed in the shell 1 made of PVC material.

The working principle of the present invention is as follows: the lightning protection device for the communication line adopts the advanced TED485 lightning protection tube and the TVS lightning protection tube as the basis, and constructs a two-level lightning protection circuit of the first level and the second level, which can realize the overall protection against the RS485 interface. Lightning strike and overvoltage protection. When the lightning induced voltage is induced on the RS-485 bus, the first-level lightning protection tube TED485 lightning protection tube responds quickly (nanosecond level), so that the lightning strike overvoltage is quickly released, and the surge voltage absorber has the characteristics of large energy absorption It can ensure that the primary anti-detonator itself will not be damaged during the large voltage discharge process, and the voltage will be reduced to about 90V. The secondary protection uses a TVS detonator. Its function is to absorb the above-mentioned residual voltage and reliably clamp it within the safe voltage range of 6.8V, which has been limited within the acceptable safe range of the terminal equipment. In this way, the purpose of lightning protection is achieved. The wiring method is: the cables of the 485 communication equipment are ground, signal A, and signal B respectively, and must be protected against lightning. The ground wire of the lightning protection module is in good contact with the ground wire. The line should be as thick, short and straight as possible. Each terminal uses a lightning protection module to strengthen the lightning protection measures for the equipment.

Claims (1)

1. A lightning protection device for communication lines, characterized in that: the lightning protection device for communication lines is provided with a first-level and a second-level lightning protection circuit, the first-level lightning protection circuit is realized by a TED485 lightning protection tube, and the second-level lightning protection circuit is realized by a TED485 lightning protection tube. Realization of TVS detonator, among them, FL is TED485 detonator, TS is TVS detonator, and its connection relationship is: TED485 detonator FL1, TED485 detonator FL2, TVS detonator TS1 and TVS detonator TS3 The positive poles of TED485 anti-detonator FL1, the negative pole of TVS anti-detonator TS1 and the positive pole of TVS anti-detonator TS2 are connected to the 485A terminal, TVS anti-detonator TS2, TVS anti-detonator TS3 and TED485 anti-detonator The negative pole of FL2 is connected to the 485B terminal; the circuit is enclosed in the PVC material shell (1) as a whole.

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