SU96428A1 - Protection device to prevent accidents in case of wire breakage of high-voltage broadcasting transmission lines - Google Patents

Description

The subject of the present invention is a protective device for automatically switching off a high-voltage radio broadcasting feeder in the event of an accident (open or broken ground).

There are known methods for protecting a broadcasting line: the creation of artificial midpoints on the terminals of the taper1, aemy line, and on between the PIM11 tripping relay, located in the place of the automatic switch installation.

In the described device, in order to determine the sensitivity of the protection, the specified Artificial Shchlyuchaetsya circuit with the capacitance O and: inductance in the shoulder of a balanced bridge fed by a non-temporal current; protection relay is included in the diagonal of the same bridge.

As can be seen from the drawing, the device uses the price of “two iROEOEds-earth, supplemented by choke 1 and capacitor 2 in one arm of the bridge, and balanced circuit 3 made of droselle, capacitor and variable resistance 4 in the other arm of the bridge.

The choke 1 is designed to prevent false positives of the protective device from being influenced by currents of the transmission frequency spectrum, which can appear in a two-ground-circuit in the presence of asymmetry in the line. Grounding the midpoint at the remote end of the system “two wires-ground through the capacitor 2 provides the ability to check the isolation of the line and the transmission by sending a direct current to it.

The bridge diagonal includes a rectifier 5 and a protection relay 6, which turns off the feeder 7. Each bridge arm is tuned approximately B to resonance at the frequency of the voltage protection system supplied through the transformer 8.