SU507834A1 - Device for automatically determining the distance to the fault on the power line - Google Patents

Description

and an amplifier 12. Synchronously with these pulses, a probe pulse generator 11 sends probe pulses through an interconnecting system to a serviced transmission line. The impulses reflected from the damage site enter the preamplifier 13, amplify and enter the amplifier 12 with a variable gain factor. From the output of amplifier 12, through stop 17, pulses are delivered to an accumulation unit consisting of adder 14, delay line 15 and amplifier 16. At the end of a predetermined number of probing cycles, counter 9 produces a pulse that triggers a one-shot 18, which delays the flip-flop of trigger 5 by time equal to the duration of the probe pulse. The trigger 5 removes the inhibit signal from the blocking generator 19, the level of which is determined by a pre-set potentiometer 20.

When the threshold level impulse accumulated on line 15 increases, the blocking generator 19 is activated and triggers trigger 2, the keys 6 and 7 are closed and the meter readings correspond to the number of kilometers to the line of damage.

From counter 9 to element I, a pulse is applied at the moment of time preceding the triggering of the blocking generator 19 from the pulse reflected from the end of the line. From the output of the element 21. The signal is fed to the input of the additional one-shot 22 and starts it. The time of the additional one-shot 22 is chosen longer than the time of the one-shot

4, therefore, the signal from the blocking generator 19 does not pass through the prohibition 23 logic element and the signal to disconnect the line is not given.

If there is damage on the transmission line, the blocking generator 19 is triggered earlier than the one-shot 22. In this case, the blocking-pulse pulse 19 passes through the inhibit element 23, and the line is turned off.

The operating time of the proposed device as a line protection device is significantly less (2–30 Msec) than the operating time of most of the known types of relay protection devices. In addition, the proposed device retains the high accuracy (1.5–2%) inherent to location-type devices. The possibility of using the same device to determine the location of damage and relay protection of the transmission line greatly simplifies and simplifies the operation of the device, reduces its total cost.

Claims (1)

Invention Formula A device for automatically determining the distance to the fault on the power line by bus. St. No. N ° 471558, characterized in that, in order to use the device for relay protection of the transmission line, the output of the counters through the logical element I and the additional one-vibrator connected in series with it are connected to a prohibition element, one input of which is connected to the blocking generator the cutter switch.