SU855549A2 - Device for burning-through damaged place of electric cable insulation - Google Patents

Description

Another current, high voltage pulse shaper with LC circuit 2 and switch 3 of relay type, additionally inserted second coil 4 inductance. second switch 5 of relay type, additional contacts 6-8 on the first and second switch 3 and 5 connecting the damaged core cable to each of the capacitor plates 9, pin 10.

The device for burning the damaged place of the electric cable insulation works as follows.

When the source 1 is turned on in circuit 2, the current increases according to the exponential law, the flow through the circuit plus the power source - circuit 2 - contact b - minus the power source. At the same time, the capacitor 9 is charged along the circuit plus the power source — coil 4 — capacitor 9 contact 6 — minus the power source. When current increases in circuit 2 to a maximum value close to steady-state, switch 3 is activated. Its contacts 6 and 7 open , -a pins 8 and 10 are closed. The previously charged capacitor 9 is connected in series with the inductor of circuit 2, the stored energy of which goes to recharge the capacitor 9. At the same time, the voltage on the capacitor 9 is doubled and fed through the closed contact 8 to the damaged cable core. When contact 10 in coil 4 is closed, the current also increases by / lo exponentially and when the maximum value is reached close to steady-state, the current-controlled switch 5 is activated, opens contacts 10 and 8 and closes contacts b and 7 (as indicated in the drawing). The capacitor 9 is connected in series with the coil 4 in the opposite polarity. Condenser 9 is recharged again, and the amplitude of the output pulses also doubles. The voltage from the capacitor 9 is fed through pin 7 to the damaged cable core. Thus, in this sequence, the cycles are repeated as the electrical strength of the insulation decreases. In the place of damage, burning is conducted directly from the source 1 by the current, flowing through circuit 2 or coil 4, alternately with the imposition of overcharging capacitor 9, which provides a couple of meters of arc in the place of afterburning of defective cable insulation.

Such an embodiment of the device allows to increase c. twice the amplitude of the output voltage pulses and optimize the arc parameters by imposing unipolar pulses on the current of the power source flowing through the damaged section of the electrical cable insulation, which increases efficiency and expands;

5 functionality of the device, since the latter can be used for breakdown of high-voltage and low-voltage cables in test facilities, as well as, for example,

0 for charging storage capacitors in electrohydraulic installations.

The efficiency of the device reduces the time it takes to burn the cable, respectively, and increases the productivity of the staff.

Claims (1)

Invention Formula A device for burning a damaged place of electrical cable insulation according to the ed. St. 259261, distinguished by the fact that, in order to increase the LCP and expand its functionality, inductors, a relay type switch, pa with a switching element controlled by current through an additional 0 coil inductance, and additional contacts on the first and second switch, the first output of the second inductor connected to the power source, the second output connected to the second capacitor plate, and the insulation of the cable through the additional contacts of the first and second switches to each of the cells condenser. Sources of information taken into account in the examination 1, USSR Author's Certificate 295261, Cl, G 01 R 31/10, 2.03.67.