SU1265659A1 - Device for estimating distance to damaged spot at power transmission lines - Google Patents

Abstract

This invention relates to electrical measuring technology. The purpose of the invention is to verify the detection of a damage site. The device comprises a control unit, a control program block 2, an attachment block 3, a reception block 4, a probe pulse generator 5, an OR 6 element, a comparison block 7 and 8, a memory block 9, a switch 11, a pulse accumulation block 12 and a display block 14. The introduction of a memory unit 10 and a counter from 13 increases the number of probes sent (L pulses to a controlled power line, which improves the statistical processing of the signal-to-noise mixture. In addition, the possibility of recording reflected signals during the operation of high-voltage switches, i.e. The measurement probability decreases. 1 Il.

Description

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The invention relates to electrical measuring technology and is intended for automatic determination of the distance to the damage site on power transmission lines.

The aim of the invention is to increase the reliability of detection of the site of damage by increasing the number of poslok of probing pulses into the controlled transmission line.

The drawing shows the structure of the device.

The device contains a control unit and a control program block 2 (performed on a microcomputer), an attachment block 3, a receive block 4, a probe generator 5, a pulsed pulse, an element OR b, a first 7 and the second 8 comparison blocks, the first 9 and the second 10 memory blocks, commentator 11, pulse accumulation unit 12 (performed on) s counter 13; block 14 display. The first output of the control unit 1 is connected to a generator 5 of probing and mycos, the output of which is connected to the input-output of the connection unit 3 and the input of the reception unit 4. The input-output of the connection unit 3 is connected to a terminal for connecting to the object 15 a control panel (power line), the output of the OR 6 element is connected to the input of the control unit, the first input of the 1-SHI 6 element is connected to the first output of the control program block 2, and the second input is with relay line protection. The second output of the control unit is connected to the input of the control unit block 2, the second OUTPUT; which is connected to the first input of the tat ora P. The output of the accumulation unit 12 is connected to the second input of the switch I1, the first output of which is connected to the first input of the first comparison unit 9, the output of the latter is connected to the input of the display unit 14. The second output of the switch 11 is connected to the input of the first memory block 9, the output of which is connected to the second input of the first compression unit 7. The output of reception unit 4 is connected to the main input of the second memory block 10 and to the input of the second comparison unit 8, the output of which is connected to the counting input of the counter 13, the output of which is connected to the reset input of the second memory block 10. The output of the latter is connected to the input of the pulse accumulation unit 12. The first

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the output of the control unit 1 is connected to the control input of the second memory unit 10 and the reset input of the counter 13, and the second output to the input of the unit 2

5 management software.

The device works as follows.

Upon command of the relay protection devices of the damaged line 15, which is supplied through the IPI 6 element, the control unit 1 supplies the triggering signal to the input of the generator 5. The probing 11 pulses generated by it, through the connection unit 3, enter the damaged line 15. Reflected from the site of damage and the non-uniformities of the VL pulses in each sounding cycle return to the beginning of the line and together with the interference 1-1 and come through

 an attachment unit 3 and a reception unit 4, where they are filtered, amplified: detected and detected. From the output of the reception unit 4, the pulses go to the second memory unit 10 and the second comparison unit 8. In memory block 10, they are successively memorized. The number of pulses exceeding in amplitude the setpoint level specified by block 8, is calculated by a counter.

30 13 in each probe cycle.

In the first n cycles of VL sounding (before the high voltage switch starts operation) the number of pulses exceeding a given level is small. Counter 13 does not dial a predetermined number in these n cycles and there is no reset signal at its output. The information from memory block 10 is copied to

 the end of each probe cycle in

pulse accumulation unit 12. If during the reception of the reflected signals, the high-voltage switch is operated (final cycles

 measurements), the number of pulses in a given sounding cycle, exceeding the level specified in block 8, is large (the number exceeds the counting factor of the counter 13),

 and at the output of counter 3, a signal appears, setting in O the second block 10 of the memory. After sending a predetermined (obviously larger) calculated number of probing pulses, information 55 from the accumulation unit 12 is triggered by the command of the control program block 2, started by the control unit 1, is recorded in the first memory block 9.

Claims (1)

Claim A device for determining the distance to the place of damage on power lines, comprising a control unit, an attachment unit, a reception unit, a probe pulse generator, an OR element, a control program unit, first and second comparison units, a switch, a first memory unit, a pulse storage unit, an indication unit , the first output of the control unit is connected to the input of the probe pulse generator, the output of which is connected to the input-output of the connection unit and the input of the reception unit, the input-output of the connection unit is connected to the terminals mine to connect to the control object, the output of the OR element is connected to the input of the control unit, the first input of the OR element is connected to the first output of the control program unit, the second input of the OR element is connected to the line relay protection, the second output of the control unit is connected to the input of the control program unit, the second the output of which is connected to the first input of the switch, the output of the pulse storage unit is connected to the second input of the switch, the first output of the switch is connected to the first input of the first comparison unit, the output of which is connected to the input of the display unit, the second output of the switch is connected to the input of the first memory unit, the output of which is connected to the second input of the first comparison unit, characterized in that, in order to increase the reliability of detecting the location of damage, a second memory unit, a counter, is introduced into it, and the output of the unit the reception is connected to the main input of the second memory unit and to the input of the second comparison unit, the output of which is connected to the counter input of the counter, the output of the counter is connected to the reset input of the second memory unit, the output of the second memory unit is connected n with the input of the accumulation unit, the first output of the control unit is connected to the control input of the second memory unit and the counter reset input.