Device for improving anti-interference capability of control cable

Abstract

The invention discloses a device for improving the anti-interference capability of a control cable, comprising a remote control signal transmitter and a remote control signal receiver, wherein the transmitter is arranged inside a control room, and remote control signals sent out by a remote controller are input into the control room; the receiver is arranged inside an electric actuating box body and is used for outputting the remote control signals to control the action of an electric operating mechanism; the transmitter is connected with the receiver by a control cable; when transmitting theremote control signals, the transmitter sends electrical signals to the receiver through control cable core wires; and when not transmitting the remote control signals, corresponding coils in the control cable core wires and the receiver are grounded. When no electrical signal exists, the device isolates all the cables from telecontrol device, integrates the relevant core wires of the cables intoa short-circuit wire for grounding, releases the electric energy gathered inside the interrupted cable core wires into the ground, and leads the cable core wires and electrical appliances connected with the cable core wires to be in the same low potential state, thus protecting the cables and the electrical appliances to be insulated.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a control device for reducing the interference of electric control cables. Background technique [0002] In the existing power grid, the electric mechanisms of a large number of high-voltage switches and high-voltage isolating switches are completed by the remote control operating system. The remote control system is composed of remote control devices, cables for intermediate transmission of closing and opening signals, and electric mechanisms. Such as figure 1 As shown, the cable plays the role of transmitting command signals, but the cable is subjected to electromagnetic interference due to the induction of strong electric field and stray current between the ground, and the energy accumulated by the interference voltage and interference current is too large, which makes the motor mechanism occur. Misoperation phenomenon, such as the remote-controlled electri...

AI Technical Summary

Problems solved by technology

[0002] In the existing power grid, the electric mechanisms of a large number of high-voltage switches and high-voltage isolating switches are completed by the remote control operating system. The remote control system is composed of remote control devices, cables for intermediate transmission of closing and opening signals, and electric mechanisms. like figure 1 As shown, the cable plays the role of transmitting command signals, but the cable is subjected to electromagnetic interference due to the induction of strong electric field and stray current between the ground, and the energy accumulated by the interference voltage and interference current is too large, which makes the motor mechanism occur. Misoperation phenomenon, such as the remote-controlled electric isolating switch used in modern high-speed railways, after the electric mechanism malfunctions, the high-voltage isolating switch is driven from opening to closing or from closing to opening, so that the high-speed The outage of railway trains or the wrong electrification in the power outage section greatly affect the normal operation of the railway or power grid and cause electrical injury to people

[0003] In order to solve this problem, two methods are currently used: one is to use optical cables to transmit command signals, but the structure of the optical cable system is complex and the cost is high, especially for remote control systems that are being used in large quantities. The wiring method requires a lot of money and time, and causes a lot of waste; the second is to use shielded cables, which are covered with a shielding layer on the outside of the cable, and the shielding layer is fixed to the ground during use. This method greatly improves the anti-interference ability of the cable. However, due to the influence of factors such as shielding layer damage and unreasonable grounding method of the shielding layer due to long-distance laying, electric energy still accumulates in each core wire of the cable in a strong electric field state. In reality, shielded cables still occur. Misoperation phenomenon of electric mechanism

Images