RU52279U1 - HEADLIGHTER - Google Patents

Abstract

The utility model relates to the field of high-frequency communications in the electric power industry and can be used to transmit supervisory control signals, relay protection, and emergency control equipment via wires of power transmission lines. The objective of the utility model is to increase the electrical strength of the trap. The essence of the proposed solution lies in the fact that in the high-frequency choke containing the power reactor, the first protective device and the tuner are connected in parallel to the power reactor, which is made in the form of a parallel-connected capacitor and a series circuit of an LC circuit and a parallel RLC circuit, an inductance coil of an LC circuit and RLC circuit is shunted by the second and third protective devices. The utility model has development, providing for possible options for the implementation of the first, second and third protective devices.

Description

The field of technology.

The utility model relates to the field of high-frequency communications in the electric power industry and can be used to transmit supervisory control signals, relay protection, and emergency control equipment via wires of power transmission lines (power lines).

The prior art.

Known high-frequency arresters containing parallel connected power reactor, protective device and tuner (certificate of the Russian Federation No. 12311, class N 04 B 3/54, publ. 1999, certificate of the Russian Federation No. 41927, class N 02 N 3/22, publ. 2004).

The disadvantages of the known solutions, including prototype protector (certificate of the Russian Federation No. 41927), is a decrease in its electric strength during transients that occur inside the tuner from the effects of overvoltages from the electric network.

Utility model creature disclosure

The objective of the utility model is to increase the electrical strength of the trap.

The essence of the proposed solution lies in the fact that in the high-frequency choke containing the power reactor, the first protective device and the tuner are connected in parallel to the power reactor, which is made in the form of a parallel-connected capacitor and a series circuit consisting of an LC circuit and a parallel RLC circuit, an LC inductor circuit and parallel RLC circuit are shunted by the second and third protective devices.

This reduces the values of overvoltage on the elements of the tuner and, accordingly, increases the dielectric strength of the trap during transients.

The utility model has developments providing for possible options for the implementation of the first, second and third protective devices.

Utility Model Implementation

Figure 1 presents a diagram of the arrestor, which contains a parallel-connected power reactor 1, a first protective device 2 and a tuner 3 made in the form of a parallel-connected capacitor 4 and a series circuit consisting of an LC circuit 5 and a parallel RLC circuit 6. Inductor 7 circuit 5 is shunted by the second protective device 8, and the parallel circuit 6 is shunted by the third protective device 9.

Conclusions 10 and 11 are designed to connect the trap to the wires of the power lines. Protective devices 2, 8 and 9 can be made in the form of varistors, spark gaps or arresters.

The trap works as follows.

High-frequency signals are received from the transmitter through the wires of power lines to the terminals 10, 11 and further to the power reactor 1, the protective device 2 and the setting unit 3. The capacitor 4, together with the inductance of the power reactor 1 and the serial circuit connected in parallel from the LC circuit 5 with the inductor 7 shunted by the protective device 8, and the parallel RLC circuit 6, shunted by the protective device 9, form a complex resonant system with a high output resistance at the signal frequency . The resistor of circuit 6 serves as the load of the resonant system and provides the necessary value of the blocking resistance in the working band of the trap for high-frequency signals.

Thus, to block the high-frequency signals of the transmitter, a filter plug is created, which is necessary when organizing the communication channel through power lines to eliminate the shunting effect of the electrical equipment of the electrical substation.

When surge waves with large amplitudes arrive through the power lines through leads 10 and 11 to the power reactor 1, the protective device 2 and the tuning unit 3, the charge of the capacitor 4 and the capacitors of circuits 5 and 6 begins. The voltage rise across the capacitor 4 and the power reactor 1 stops when when they reach the threshold level of the protective device 2. Thus, the amplitude of the overvoltage on the capacitor 4 and the power reactor 1 is limited to a safe value for them. The greatest danger of overvoltage is for capacitors,

Next, the transition process continues in block 3 settings with circuits 5 and 6.

This process acquires an oscillatory or aperiodic character depending on the quality factor of the circuit, since the energy is extinguished by the active resistance of circuit 6. The transition process is accompanied by a further increase in voltage on the capacitors of circuits 5 and 6 due to the influence of the remaining voltage on the protective device 2 and the magnetic energy stored in inductors of circuits 5 and 6.

When the voltage across the inductor 7 reaches a value equal to the threshold level of the protective device 8, it is triggered. The quality factor of circuit 5 is reduced, however, the transition process continues in the circuit containing the capacitor of circuit 5 and the parallel circuit 6. After the third protective device 9 is activated, the transition process stops.

Thus, due to the use of the second and third protective devices 8 and 9, the voltage level on the elements of the tuning unit 3

can be reduced to a safe value and, accordingly, the reliability of the suppressor during the transient process under the influence of the surge suppressor waves arising in the electrical networks is increased.

Claims (4)

1. High-frequency choke containing a power reactor, the first protective device connected in parallel with the power reactor and a tuner made in the form of a parallel-connected capacitor and a series circuit of an LC circuit and a parallel RLC circuit, while the inductance coil of the LC circuit and the RLC circuit are shunted by the second and third protective devices. 2. The trap according to claim 1, characterized in that in it the first, second and third protective devices are made in the form of varistors. 3. The trap according to claim 1, characterized in that in it the first, second and third protective devices are made in the form of spark gaps. 4. The trap according to claim 1, characterized in that in it the first, second and third protective devices are made in the form of arresters.