SU1638677A1 - Device for burning out and location of cable damage sites - Google Patents

Description

one

(21) 446805/21

(22) 07.29.88

(46) 03/30/91. Bul № 12

(71) Leningrad Design Experimental Division of the All-Union State Research and Design Institute VNIIProeklektromontazh

(72) N.I. Litvinov and A.V. Sadykov

(53) 621.317 (088.8)

(56) USSR Author's Certificate No. 817618, cl. G 01 R 31/10, 1981.

USSR Author's Certificate No. 828129, cl. C 01 R 31/10, 1981.

(54) DEVICE FOR BURNING AND SEARCHING FOR THE CABLE DAMAGE POSITION

(57) The invention relates to a counter measuring and measuring technique and can be used for burning and

locating damage to the cable. The purpose of the invention is to improve the reliability of burning the fault in the cable. Another goal is to reduce the time it takes to find a fault in a cable. The burning current supplied to the controlled cable 9 contains a constant component necessary to burn through the places of damage and maintenance of the arc, as well as vibrations of the sound frequency f produced by the low-frequency generator 5 and fed to the input of the pulse-width converter 6 modulating the signal of the autonomous inverter 2, having a frequency

f 4

0f.

2

This allows simultaneous

It is possible to burn the fault location and its search using the search receiver 8. 1 Il.

3

with

00

with

J

J16

The invention relates to instrumentation technology and can be used for burning and locating cable damage.

The aim of the invention is to improve the reliability of burning and shortening the search time for a fault in a cable.

The drawing shows a block diagram of the device.

The device contains a bridge 1, a standalone voltage inverter 2, a power transformer 3, an output rectifier 4, a low-frequency generator 5, a pulse-width converter 6, a burning current sensor 7, a search receiver 8, a controlled cable 9, the output of converter 6 being connected to the input Inverter 2, the power input of which is connected to the output of bridge 1, and the output to the input of transformer 3, the first output terminal of which is connected to the first input terminal of the rectifier 4, and the second to the input terminal of the sensor 7, the first output terminal of which with the second input output of the rectifier 4, and the second with the control input of the converter 6, the signal input of which is connected to the output of the generator 5, while the rectifier 4 is made according to the full-wave circuits

The device works as follows.

The rectified voltage is fed from the output of bridge 1 to the input of inverter 2. At the same time, its control input is supplied with a signal from the output of converter 6, which produces a sequence of pulses with a frequency f (and a well that changes depending on the signal from the output sensor 7 (thus, the burning current is stabilized). At the same time, the low-frequency generator 5 produces a series of pulses of frequency f ,, which serve to enable the converter 6 to operate, while f Ј lOOfg. As a result, the control signal for the inverter 2 outputted from the converter 6 is eg zhe

frequency f ,,, with frequency f.

served in packs

As a result, at the output of the inverter 2, a two-pole voltage modulated takes place. After passing through the power transformer 3 and full-wave rectification at the output rectifier 4, the voltage from the device output is fed to the controlled cable 9. The burning current resulting from this contains a constant component necessary to maintain the arc burning, as well as fluctuations of the sound frequency fЈ, which make it possible to simultaneously search for the damage site using the appropriate search Receiver 8.

five

0

five

Claims (1)

Invention Formula A device for burning and locating cable damage, containing a rectifying bridge, an autonomous voltage inverter, a power transformer, a burning current sensor, an output rectifier, a search receiver, a pulse-width converter whose output is connected to the control input of an autonomous voltage inverter, an input the power supply of which is connected to the output of the rectifying bridge, and the output - to the input of the power transformer, the first output terminal of which is connected to the first input output of the output rectifier, and the second to the input The output of the burning current sensor, the first output of which is connected to the second input output of the output rectifier, and the second output to the control input of the pulse-width converter, characterized in that, in order to improve the reliability of burning and shorten the search time of the fault location cable, a low-frequency generator is inserted into it, the output of which is connected to the signal input of a pulse-width converter, the output rectifier being made according to a full-wave circuit, and the frequency of the output low-frequency voltage The main generator f is related to the frequency f of the output voltage of the pulse-width converter by the relation f 5; 10fz.