CN104181437B - A kind of two-conductor high frequency transmission line trouble point measurement apparatus and its measuring method - Google Patents
A kind of two-conductor high frequency transmission line trouble point measurement apparatus and its measuring method Download PDFInfo
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- CN104181437B CN104181437B CN201410421144.4A CN201410421144A CN104181437B CN 104181437 B CN104181437 B CN 104181437B CN 201410421144 A CN201410421144 A CN 201410421144A CN 104181437 B CN104181437 B CN 104181437B
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Abstract
A kind of two-conductor high frequency transmission line trouble point measurement apparatus and its measuring method, are related to transmission line trouble point fields of measurement.The measurement apparatus measure error that the present invention solves existing two-conductor high frequency transmission line trouble point (short circuit, open circuit) position is larger, it is impossible to the problem of the position of the accurate localization of faults.A kind of two-conductor high frequency transmission line trouble point measurement apparatus, including microprocessor, transmitting filter, slip measuring flume, slide measurement pin, waveform shaper, high frequency voltmeter and matched load；Microprocessor arranges test signal serial output terminal and test signal serial input terminal；The output end of slip measuring flume arranges tested transmission line junction.Method of testing：First, attachment means；2nd, trough point is looked for；3rd, echo time delay is surveyed；4th, position of failure point is calculated.The measurement apparatus and its measuring method of the present invention, simple structure, certainty of measurement are high, and the position of the accurate localization of faults is brought great convenience to maintainer；Meanwhile, easy to operate, testing efficiency is high.
Description
Technical field
The present invention relates to transmission line trouble point fields of measurement, more particularly to a kind of two-conductor high frequency transmission line trouble point is surveyed
Amount device and its measuring method.
Background technology
The measurement of existing two-conductor high frequency transmission line trouble point (short circuit, open circuit) position all adopts electric bridge or ohmmeter, electricity
The method for holding table measurement D.C. resistance (for short circuit) or measurement DC capacitor (for open circuit).D.C. resistance due to transmission line
There is the coupled problem with other perimeter conductors in the very little or DC capacitor of numerical value, often measure error is larger, it is impossible to accurate true
Determine the position of short dot or open circuit point.
Content of the invention
For solve above-mentioned technical problem, the invention provides a kind of two-conductor high frequency transmission line trouble point measurement apparatus and its
Measuring method.
The technical solution adopted for the present invention to solve the technical problems is：A kind of two-conductor high frequency transmission line trouble point measurement
Device, including microprocessor, transmitting filter, slip measuring flume, slide measurement pin, waveform shaper, high frequency voltmeter and
Join load；Wherein, described microprocessor can calculate echo time delay and position of failure point；Survey is provided with described microprocessor
Trial signal serial output terminal and test signal serial input terminal；Described test signal serial output terminal linkup transmit wave filter
Input；The input of the output end connection slip measuring flume of described transmitting filter；The output of described slip measuring flume
Tested transmission line junction is provided with end, for connecting the top of tested transmission line；Described matched load is arranged on tested biography
The end of defeated line；Described slip measurement pin is arranged in slip measuring flume, for catching the high-frequency signal in slip measuring flume；
The output end of described slip measurement pin is simultaneously connected to the input of high frequency voltmeter and waveform shaper；Described waveform is whole
The output end connecting test signal serial input terminal of shape device.
The first LPT is additionally provided with described microprocessor, and the first LPT connects keyboard, for receiving keyboard
Order.
The second LPT is additionally provided with described microprocessor, the second LPT connects display, for showing test
Data.
A kind of method of testing of two-conductor high frequency transmission line trouble point measurement apparatus, specifically completes according to following steps：
First, in the tested transmission line junction in described two-conductor high frequency transmission line trouble point measurement apparatus, connect tested transmission line,
The end of transmission line connects one with line characteristic impedance identical matched load；2nd, start two-conductor high frequency transmission line fault
Point measurement apparatus, send test signal, adjust the measurement pin that slides, and indicate high frequency voltmeter minimum, as trough point；3rd, protect
The position for holding the measurement pin that slides is constant, closes two-conductor high frequency transmission line trouble point measurement apparatus, is then again started up, microprocessor
Device collection is received from signal to the time delay of signal terminating, i.e. echo time delay；4th, pass through echo time delay, calculate tested transmission line event
The position of barrier point.
The calculating of the position of the echo time delay in described step four and transmission line trouble point, can be by the journey of microprocessor
Realizing, result of calculation shows sequence over the display.
The operation principle of the present invention：Microprocessor produces the square-wave signal of the MHz order of magnitude from its test signal Serial output
End output, exports the sinusoidal signal of same frequency after transmitting filter filtering, is defeated by slip measuring flume；Slip measuring flume defeated
Go out to terminate tested transmission line, the end of tested transmission line connects one with line characteristic impedance identical matched load；Slide and survey
There is the intensity of the detectable groove high frequency signal of measurement pin that slides in measuring tank, shown with high frequency voltmeter；The measurement pin that slides is same
When be connected to waveform shaper, waveform shaper becomes sine wave shaped after same frequency square wave, be input to microprocessor test letter
Number serial input terminal；When tested transmission line somewhere has short dot or open circuit point failure, test signal can be complete in trouble point
Reflection (i.e. echo), echo is superimposed with incoming signal, can form " standing wave " in tested transmission line and slip measuring flume；Standing wave has
Trough and crest, superposed signal during reflection at trough are minimum；The measurement pin that slides is placed in the position of trough, the measurement pin that slides is several
No output signal (high frequency voltmeter is designated as zero), cause the test signal serial input terminal of microprocessor nothing input letter yet
Number, microprocessor has signal reception to start to no signal to receive this period of time by metering from test signal serial input terminal
Difference, is echo time delay, i.e. t2-t1；Further according to signaling rate in transmission lineThe trouble point of transmission line is from biography
The distance of the measurement end of defeated line can just pass through formulaIt is calculated；
In formula, c is light speed in a vacuum；εrRelative dielectric constant for two conductor transmission line interior insulation medium.
Advantages of the present invention：First, the measurement apparatus of the present invention, simple structure, certainty of measurement are high, and resistance value can be overcome non-
There is the impact with the coupling of other perimeter conductors in often little or DC capacitor, can accurately find the trouble point of tested transmission line
Position, bring great convenience to maintainer；2nd, the method for testing of the present invention, easy to operate, and testing efficiency is high, precision
High.
Description of the drawings
Fig. 1 is the schematic diagram of the two-conductor high frequency transmission line trouble point measurement apparatus of embodiment；Wherein, X position is fault
Point；
Fig. 2 is standing wave and the trough schematic diagram of the two-conductor high frequency transmission line trouble point measurement apparatus of embodiment；
Fig. 3 is the echo time delay schematic diagram of the two-conductor high frequency transmission line trouble point measurement apparatus of embodiment；
Wherein, 1- microprocessor, 2- transmitting filter, 3- slip measuring flume, 4- slide and measure pin, 5- waveform shaper,
6- high frequency voltmeter, 7- matched load, 8- keyboard, 9- display, 11- test signal serial output terminal, 12- test signal serial
Input, the first LPT of 13-, the second LPT of 14-, the tested transmission line junction of 31-, A- trough point, B- wave crest point.
Specific embodiment
In order to deepen the understanding of the present invention, the present invention is done below in conjunction with drawings and Examples and retouch in detail further
State, the embodiment is only used for the present invention is explained, protection scope of the present invention is not constituted and limit.
Embodiment
As shown in figure 1, a kind of two-conductor high frequency transmission line trouble point measurement apparatus, including microprocessor 1, transmitting filter
2nd, slip measuring flume 3, slip measurement pin 4, waveform shaper 5, high frequency voltmeter 6 and matched load 7；Wherein, described micro- place
Reason device can calculate echo time delay and position of failure point；11 He of test signal serial output terminal is provided with described microprocessor 1
Test signal serial input terminal 12；The input of described 11 linkup transmit wave filter 2 of test signal serial output terminal；Described
The input of the output end connection slip measuring flume 3 of transmitting filter 2；It is provided with the output end of described slip measuring flume 3
Tested transmission line junction 31, for connecting the top of tested transmission line；Described matched load 7 is arranged on the end of tested transmission line
End；Described slip measurement pin 4 is arranged in slip measuring flume 3, for catching the high-frequency signal in slip measuring flume；Described
The output end of slip measurement pin 4 is simultaneously connected to input and the high frequency voltmeter 6 of waveform shaper 5；Described waveform shaping
The output end connecting test signal serial input terminal 12 of device 5；The first LPT 13 is additionally provided with described microprocessor 1, the
One LPT 13 connects keyboard 8, for receiving the order of keyboard 8；The second LPT is additionally provided with described microprocessor 1
14, the second LPT 14 connects display 9, for showing test data.
A kind of two-conductor high frequency transmission line trouble point measurement apparatus of the present embodiment complete measurement by the following method：
First, in the tested transmission line junction 31 in described two-conductor high frequency transmission line trouble point measurement apparatus, connection
Tested transmission line, the end of transmission line connect one with line characteristic impedance identical matched load 7；2nd, start two-conductor high
Frequency transmission line trouble point measurement apparatus, send test signal, adjust the measurement pin 4 that slides, make high frequency voltmeter 6 indicate minimum, i.e.,
For trough point A；3rd, keep the position of slip measurement pin 4 constant, two-conductor high frequency transmission line trouble point measurement apparatus are closed, so
After be again started up, microprocessor 1 gathers the time delay received to signal terminating, i.e. echo time delay from signal；When the 4th, using echo
Prolong, calculate the position of tested transmission line trouble point；Especially, in step 4 echo time delay and the position of transmission line trouble point
Calculate, can be realized by the program of microprocessor, result of calculation shows on the display 9.
The operation principle of the present embodiment：As shown in Figures 2 and 3, microprocessor 1 produce the MHz order of magnitude square-wave signal from
Its test signal serial output terminal 11 is exported, and exports the sinusoidal signal of same frequency, be defeated by slip after filtering through transmitting filter 2
Measuring flume 3；The output of slip measuring flume 3 terminates tested transmission line, and the end of tested transmission line connects one with transmission line characteristics resistance
Anti- identical matched load 7；There is the intensity of the detectable groove high frequency signal of measurement pin 4 that slides in slip measuring flume 3, with height
Frequency voltmeter 6 shows；Measurement pin 4 is slided while waveform shaper 5 is connected to, sine wave shaped is become same frequency by waveform shaper 5
After square wave, the test signal serial input terminal 12 of microprocessor 1 is input to；When tested transmission line somewhere has short dot or open circuit
During point failure (as " X " point in Fig. 1), test signal can be totally reflected in trouble point (i.e. echo), and echo is folded with incoming signal
Plus, " standing wave " (as shown in Figure 2) can be formed in tested transmission line and slip measuring flume；Standing wave has trough A and crest B, reflection
Superposed signal at Shi Bogu A is minimum；The measurement pin 4 that slides is placed in the position of trough A, the measurement pin 4 that slides almost does not have output letter
Number (high frequency voltmeter 6 is designated as zero), causes the test signal serial input terminal 12 of microprocessor 1 also nothing input signal, micro- place
Reason device 1 has signal reception to start to no signal to receive this section of time difference by metering from test signal serial input terminal 12, is
Echo time delay, i.e. t2-t1(as shown in Figure 3)；Further according to signaling rate in transmission lineThe fault of transmission line
Point passes through formula with a distance from the measurement end of transmission line：Calculate
Arrive；In formula, c is light speed in a vacuum；εrRelative dielectric constant for two conductor transmission line interior insulation medium.
Above-described embodiment should not in any way limit the present invention, all be obtained by the way of equivalent or equivalency transform
Technical scheme all fall within protection scope of the present invention.
Claims (5)
1. a kind of two-conductor high frequency transmission line trouble point measurement apparatus, it is characterised in that：It includes microprocessor, sends filtering
Device, slip measuring flume, slip measurement pin, waveform shaper, high frequency voltmeter and matched load；Wherein, described microprocessor
Echo time delay and position of failure point can be calculated；Test signal serial output terminal and test signal is provided with described microprocessor
Serial input terminal；The input of described test signal serial output terminal linkup transmit wave filter；Described transmitting filter
The input of output end connection slip measuring flume；Tested transmission line junction is provided with the output end of described slip measuring flume,
For connecting the top of tested transmission line；Described matched load is arranged on the end of tested transmission line；Described slip measurement
Pin is arranged in slip measuring flume, for catching the high-frequency signal in slip measuring flume；The output end of described slip measurement pin
It is simultaneously connected to the input of high frequency voltmeter and waveform shaper；The output end connecting test signal of described waveform shaper
Serial input terminal.
2. a kind of two-conductor high frequency transmission line trouble point measurement apparatus according to claim 1, it is characterised in that：Described
The first LPT is additionally provided with microprocessor, and the first LPT connects keyboard, for receiving the order of keyboard.
3. a kind of two-conductor high frequency transmission line trouble point measurement apparatus according to claim 1 and 2, it is characterised in that：Institute
The second LPT is additionally provided with the microprocessor that states, and the second LPT connects display, for showing test data.
4. a kind of method of testing of two-conductor high frequency transmission line trouble point measurement apparatus as claimed in claim 1, its feature exist
In：Method of testing is specifically completed according to following steps：
First, in the tested transmission line junction in described two-conductor high frequency transmission line trouble point measurement apparatus, connect tested biography
Defeated line, the end of transmission line connect one with line characteristic impedance identical matched load；
2nd, start two-conductor high frequency transmission line trouble point measurement apparatus, test signal is sent, the measurement pin that slides is adjusted, makes high frequency
Voltmeter indicates minimum, as trough point；
3rd, keep the position of slip measurement pin constant, two-conductor high frequency transmission line trouble point measurement apparatus are closed, is then opened again
Dynamic, microprocessor collection is received from signal to the time delay of signal terminating, i.e. echo time delay；
4th, pass through echo time delay, calculate the position of tested transmission line trouble point.
5. the method for testing of a kind of two-conductor high frequency transmission line trouble point measurement apparatus according to claim 4, its feature
It is：The calculating of the position of the echo time delay in described step four and transmission line trouble point, can be by the program of microprocessor
To realize, result of calculation shows over the display.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410421144.4A CN104181437B (en) | 2014-08-25 | 2014-08-25 | A kind of two-conductor high frequency transmission line trouble point measurement apparatus and its measuring method |
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| CN201410421144.4A CN104181437B (en) | 2014-08-25 | 2014-08-25 | A kind of two-conductor high frequency transmission line trouble point measurement apparatus and its measuring method |
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| CN104181437B true CN104181437B (en) | 2017-03-08 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5083086A (en) * | 1990-07-12 | 1992-01-21 | James G. Biddle Co. | Differential arc reflectometry |
| CN1307682A (en) * | 1998-04-29 | 2001-08-08 | 西门子公司 | Method and device for monitoring an electrode line of a bipolar high voltage direct current (HVDC) transmission system |
| WO2009076355A1 (en) * | 2007-12-11 | 2009-06-18 | Marvell World Trade Ltd. | Sub-symbol rate cable tester |
| CN102608466A (en) * | 2012-03-21 | 2012-07-25 | 南京航空航天大学 | Method for rapidly predicting cable crosstalk in electrical wiring interconnection system (EWIS) |
| CN103048563A (en) * | 2012-12-19 | 2013-04-17 | 南京航空航天大学 | Method for rapidly estimating crosstalk of cable harness terminal above right-angle grounded plane |
| CN204028277U (en) * | 2014-08-25 | 2014-12-17 | 吴江通信电缆厂 | Two-conductor high frequency transmission line trouble spot measurement mechanism |
-
2014
- 2014-08-25 CN CN201410421144.4A patent/CN104181437B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5083086A (en) * | 1990-07-12 | 1992-01-21 | James G. Biddle Co. | Differential arc reflectometry |
| CN1307682A (en) * | 1998-04-29 | 2001-08-08 | 西门子公司 | Method and device for monitoring an electrode line of a bipolar high voltage direct current (HVDC) transmission system |
| WO2009076355A1 (en) * | 2007-12-11 | 2009-06-18 | Marvell World Trade Ltd. | Sub-symbol rate cable tester |
| CN102608466A (en) * | 2012-03-21 | 2012-07-25 | 南京航空航天大学 | Method for rapidly predicting cable crosstalk in electrical wiring interconnection system (EWIS) |
| CN103048563A (en) * | 2012-12-19 | 2013-04-17 | 南京航空航天大学 | Method for rapidly estimating crosstalk of cable harness terminal above right-angle grounded plane |
| CN204028277U (en) * | 2014-08-25 | 2014-12-17 | 吴江通信电缆厂 | Two-conductor high frequency transmission line trouble spot measurement mechanism |
Non-Patent Citations (1)
| Title |
|---|
| 吕瀚 等.基于TDR多芯信号电缆故障测试装置的研制.《大地测量与地球动力学》.2011,第31卷 * |
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