CN101706564B - Cable failure flash detector calibrating device - Google Patents
Cable failure flash detector calibrating device Download PDFInfo
- Publication number
- CN101706564B CN101706564B CN2009102250759A CN200910225075A CN101706564B CN 101706564 B CN101706564 B CN 101706564B CN 2009102250759 A CN2009102250759 A CN 2009102250759A CN 200910225075 A CN200910225075 A CN 200910225075A CN 101706564 B CN101706564 B CN 101706564B
- Authority
- CN
- China
- Prior art keywords
- module
- cable
- signal
- speed
- input signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Tests Of Electronic Circuits (AREA)
Abstract
A cable failure flash detector calibrating device belongs to the field of calibration, verification and detection of power detection instruments, and comprises an upper computer and a lower computer. The core circuit of the lower computer mainly comprises a control module, a cable core wire multiplexing module, an input signal regulating module, a signal delay feedback module, and a high-speed amplification and drive module, wherein the relation between all the modules is as follows: the detected cable failure flash detector is connected with the cable core wire multiplexing module; the cable core wire multiplexing module, the input signal regulating module, the control module, the signal delay feedback module and the high-speed amplification and drive module are connected sequentially; and the high-speed amplification and drive module is connected with the input signal regulating module. The core design idea is to adopt a 'passive feedback loop' to simulate the time-domain reflection features of real cables. With the invention, main measurement functions, i.e. the distance-measuring function and the speed-measuring function and the like, of the cable failure flash detector can be calibrated reasonably and effectively.
Description
Technical field
The present invention relates to a kind of cable failure flash detector calibrating device, belong to calibration, calibrating and the detection range of power test instrument.
Background technology
Be to measure, location cable fault distance, many power test instruments manufacturer has developed the cable fault flash tester.The cable fault flash tester is as working measuring instrument, the essence measurement parameter is a time quantum, in power industry standard " DL/T849.1-2004 power equipment special test equipment general technical specifications part 1: cable fault flash tester ", explicitly call for range finding, function such as test the speed calibrates, detects to the cable fault flash tester.But and numerous prerun instrument class seemingly, because specific aim is stronger, interface is special, and its meter characteristic is difficult to conveniently be traceable to higher level's time measurement standard, so need the special standard set-up of development, to help such testing tool carried out calibration operation.
Known to the applicant, at present, domestic only several family unit carries out calibration operation to the cable fault flash tester, take calibration steps also to be traditional real object method, its principal feature is: with cable in kind as the standard utensil, with length measuring device cable length in kind is demarcated in advance, to be calibrated after, utilize this material object cable that tested cable fault flash tester is calibrated again.This conventional calibration method has many deficiencies, mainly is: as the standard utensil, and cable temperature influence in kind, its length can produce bigger variation, and owing to itself have elasticity, adds artificial gross error etc., its calibrating length work complexity, accuracy are low, and bulky; Simultaneously, cable in kind often is single or fixed insulation material, and the cable type that can simulate is not abundant, if want to simulate the various material cable, its cost can improve greatly.
In sum, but all there are deficiency in present domestic traditional standard set-up and calibration steps on principle of work and traceability, and accuracy can not meet the demands.The limits of error of considering cable fault flash tester nominals a large amount of on the market can reach ± and (1% reading ± 20 meter), and above-mentioned limit by accuracy and convenience by the classic method of standard utensil with cable in kind, be difficult to the cable fault flash tester is carried out convenient, calibration operation efficiently.
The present invention carries out the specific aim design with reference to the requirement of power industry standard DL/T 849.1-2004, come the Time Domain Reflectometry characteristic of object simulating cable by " passive backfeed loop ", reasonable in design, the automaticity height, simple operation, the testing person can directly preset the relevant criterion value, and do not need additionally manually to carry out work such as time conversion, can the cable fault flash tester of present main flow be carried out rationally, calibration operation efficiently, can better satisfy the urgent needs of present cable fault flash tester calibration operation.
Summary of the invention
The objective of the invention is deficiency at traditional cable fault flash tester calibration steps, propose and realized a kind of new cable failure flash detector calibrating device, its core design thinking is to come by " passive backfeed loop " the Time Domain Reflectometry characteristic of object simulating cable, and utilizing the present invention can be that distance measurement function, speed measuring function etc. carry out rationally, calibration operation efficiently to the main measurement function of cable fault flash tester.
To achieve these goals, technical solution of the present invention provides a kind of cable failure flash detector calibrating device based on the design of " passive backfeed loop " thinking, comprise host computer and slave computer, it is characterized in that: the core circuit of slave computer mainly comprises: control module, the cable core Multiplexing module, the input signal conditioning module, the signal lag feedback module, amplify at a high speed and driver module, each intermodule relation is: tested cable fault flash tester stube cable heart yearn Multiplexing module, the cable core Multiplexing module, the input signal conditioning module, control module, the signal lag feedback module, amplification and driver module connect successively at a high speed, amplify at a high speed and driver module connection input signal conditioning module.
Aforesaid a kind of cable failure flash detector calibrating device, it is characterized in that: control module mainly is made of digital signal processor and communication chip, digital signal processor connects communication chip, and this module functions is to realize communicating by letter with host computer and carry out the order, formation precision time delay gating pulse of host computer and other modules are specifically controlled.
Aforesaid a kind of cable failure flash detector calibrating device; it is characterized in that: the cable core Multiplexing module mainly is made of the clamped holding circuit that quick TVS pipe and fast diode are formed, and can will incide the incident square-wave pulse P of low-yield, the peak value of standard set-up based on this module
InSignal is clamped, nurse one's health into small leak incident pulse signal Signal-input, thereby a back level internal circuit shock effect is reduced greatly.The beneficial effect of this design is: to the present invention, its cable core simulation terminal is incident square-wave pulse signal P
InWith time-delay reflection output pulse signal P
OutInstitute is multiplexing, wherein P
InFrom tested cable fault flash tester, its amplitude range mostly at 1V in the 100V scope, and the time-delay that the present invention produces reflection output pulse signal P
OutLight current feedback circuit from standard set-up inside, this signal amplitude is designed to from 0.5V to 2V, the situation of this strong, the multiplexing cable core terminal of weak signal is if no specialized designs causes the infringement of incident high-voltage pulse signal to the standard set-up internal circuit probably.
Aforesaid a kind of cable failure flash detector calibrating device, it is characterized in that: the input signal conditioning module mainly is made of high-speed comparator and high speed or door, high-speed comparator connects at a high speed or door, based on this module, the plus or minus hopping edge of small leak incident pulse signal Signal-input can be converted to the TTL signal TTL-input of positive transition, be used to trigger back level signal lag feedback module.
Aforesaid a kind of cable failure flash detector calibrating device, it is characterized in that: the signal lag feedback module is mainly by the DDS chip that connects successively, the high-speed-differential amplifying circuit, digital regulation resistance is formed, under prime Transistor-Transistor Logic level signal TTL-input triggers, aforementioned control module presets delay requirement according to the testing person, based on the steady clock delay of height and feed back one road precision time delay gating pulse Delay-ctrl, this gating pulse can directly be fed back output, also can be used as trigger pip and start DDS chip outputting high quality differential sine wave shape fast, in this way, the present invention can form precision time delay feedback waveform Delay-back, can feed back the output square-wave signal and also can feed back the sine wave output signal according to presetting; Digital regulation resistance mainly utilizes the branch compression functions to come the controlling party wave amplitude.
Aforesaid a kind of cable failure flash detector calibrating device, it is characterized in that: amplify at a high speed and driver module, this module realizes based on the high-speed broadband amplifier of fixed gain, the function of this module is accepted the precision time delay feedback waveform Delay-back that aforementioned signal lag feedback module produces, high-speed broadband amplifier through fixed gain further improves driving force again, its output signal and Signal-input are same electrical nodes, this signal will feed back on the cable core terminal through the cable core Multiplexing module, finally form time domain time-delay reflection output pulse signal P
Out
Principle of work of the present invention is: is that cable core simulation terminal is seen into from standard set-up left side, can presents the Time Domain Reflectometry characteristic of uniform transmission line, just at the incident square-wave pulse P of tested cable fault flash tester
InExcitation under, standard set-up can produce time-delay reflection output pulse signal P
Out, and P
In, P
OutThe time interval strictness of two signals is proportional to the standard fault distance of the uniform transmission line of simulation.The standard fault distance computing formula of simulation is:
S
o＝v×ΔT
o/2
In the following formula, S
oBe the standard fault distance of simulation, v is a row wave speed, Δ T
oBe pulse two-way time.V is the row wave speed of square-wave pulse signal in different insulative material cable, Δ T
oReality is P
OutSignal is to P
InBe because standard fault distance should be setback return total kilometres half divided by 2 the time delay of signal.
In view of incident square-wave pulse P
InAmplitude range all possible from 1V to 100V with the different designs of tested cable fault flash tester, and pulse direction have just have negative, after so this pulse signal enters standard set-up by the cable core connection terminal, at first nursed one's health and be the small leak pulse signal Signal-input of amplitude less than 6V through the cable core Multiplexing module, the Signal-input signal is with after the input signal conditioning module becomes forward Transistor-Transistor Logic level signal TTL-input, this Transistor-Transistor Logic level signal starts the control module that presets delay parameter as start pulse signal, control module further produces precision time delay gating pulse Delay-ctrl based on high stability crystal oscillator, this control wave enabling signal time-delay feedback module is to form amplitude, the precision time delay feedback waveform Delay-back that waveform is adjustable, this feedback waveform amplify through the high speed of fixed gain again and driver module improves driving force and the final time-delay reflection output pulse signal P that forms
Out, this time-delay reflection output pulse signal P
OutMultiplexing cable core also feeds back to tested cable fault flash tester.By above-mentioned workflow, the present invention gets final product the Time Domain Reflectometry characteristic of object simulating cable, can be used for the cable fault flash tester is calibrated.
The invention has the beneficial effects as follows: the present invention is based on the Time Domain Reflectometry characteristic that the mentality of designing of " passive backfeed loop " is come the object simulating cable, the standard fault distance limits of error of the calibrating installation simulation by the development of this principle can reach ± and (0.2% reading ± 2 meter), and it is stable and reliable for performance, the automaticity height, simple operation, thereby can effectively satisfy calibration operation to the cable fault flash tester, to help solving the calibration difficulties problem of cable fault flash tester, to impelling the power test instrument to standardization, the standardization direction develops the effect of actively promoting.
Description of drawings
Fig. 1 is traditional cable fault flash tester calibration steps principle schematic based on real object method.
Fig. 2 is the cable failure flash detector calibrating device theory diagram of the embodiment of the invention.
Fig. 3-1 is the circuit theory diagrams of cable core Multiplexing module among Fig. 2.
Fig. 3-2 is circuit theory diagrams of input signal conditioning module among Fig. 2.
Fig. 3-3 is theory diagrams of signal lag feedback module among Fig. 2.
Fig. 3-4 is circuit theory diagrams of amplification of Fig. 2 high speed and driver module
Embodiment
The present invention is described further below in conjunction with accompanying drawing.
Mark among the figure: 1-control module, 2-cable core Multiplexing module, 3-input signal conditioning module, 4-signal lag feedback module, 5-amplifies at a high speed and driver module, the 6-communication interface, the tested cable fault flash tester of 7-, 8, the 14-cable core, the 9-cable shield, 10-cable fault distance, 11-cable in kind, 12-host computer, 13-slave computer, the 15-cable shield, the 16-analog gate.
Referring to shown in Figure 1, be traditional cable fault flash tester calibration steps principle schematic based on real object method.This method, is demarcated cable length in kind with length measuring device as the standard utensil in advance with cable 11 in kind, to be calibrated after, utilize this material object cable that tested cable fault flash tester is calibrated again.This conventional calibration method has many deficiencies, mainly is: as the standard utensil, and cable temperature influence in kind, its length can produce bigger variation, and owing to itself have elasticity, adds artificial gross error etc., its calibrating length work complexity, accuracy are low, and bulky; Simultaneously, cable in kind often is single or fixed insulation material, and the cable type that can simulate is not abundant, if want to simulate the various material cable, its cost can improve greatly.
Referring to shown in Figure 2, be the cable failure flash detector calibrating device theory diagram of the embodiment of the invention.Standard set-up is made of host computer 12 and slave computer 13, and slave computer 13 core circuits are amplified by control module 1, cable core Multiplexing module 2, input signal conditioning module 3, signal lag feedback module 4, high speed and driver module 5 is formed.Its principle of work is: is that cable core simulation terminal is seen into from standard set-up left side, can presents the Time Domain Reflectometry characteristic of uniform transmission line, just at the incident square-wave pulse P of tested cable fault flash tester 7
InExcitation under, standard set-up can produce time-delay reflection output pulse signal P
Out, and P
In, P
OutThe time interval strictness of two signals is proportional to the standard fault distance of the uniform transmission line of simulation.The standard fault distance computing formula of simulation is:
S
o＝v×ΔT
o/2
In the following formula, S
oBe the standard fault distance of simulation, v is a row wave speed, Δ T
oBe pulse two-way time.V is the row wave speed of square-wave pulse signal in different insulative material cable, Δ T
oReality is P
OutSignal is to P
InBe because standard fault distance should be setback return total kilometres half divided by 2 the time delay of signal.
In view of incident square-wave pulse P
InAmplitude range all possible from 1V to 100V with the different designs of tested cable fault flash tester 7, and pulse direction have just have negative, after so this pulse signal enters standard set-up by the cable core connection terminal, at first be the small leak pulse signal Signal-input of amplitude by conditioning less than 6V through cable core Multiplexing module 2, the Signal-input signal is with after input signal conditioning module 3 becomes forward Transistor-Transistor Logic level signal TTL-input, this Transistor-Transistor Logic level signal starts the control module 1 that presets delay parameter as start pulse signal, control module 1 further produces precision time delay gating pulse Delay-ctrl based on high stability crystal oscillator, this control wave enabling signal time-delay feedback module 4 is to form amplitude, the precision time delay feedback waveform Delay-back that waveform is adjustable, this feedback waveform amplify through the high speed of fixed gain again and driver module 5 improves driving force and the final time-delay reflection output pulse P that forms
Out, this time-delay reflection output pulse P
OutMultiplexing cable core feeds back to tested cable fault flash tester.
Shown in Fig. 3-1, be the circuit theory diagrams of cable core Multiplexing module among Fig. 2.P
InThe corresponding cable core terminal of signal, when carrying out the PCB design, incoming signal P
InClamped holding circuit at first through forming by 4 Ultrafast recovery diode MURS360T3, the P of low-yield like this, peak value
InSignal can be by clamped near the power supply current potential through this loop, power supply select for use have overvoltage protection, the high reliability ± 5V power module of function such as short-circuit protection, through P behind this loop
InThe peak value scope by clamped being controlled at-5.7V ~+5.7V within, form small leak pulse signal Signal-input, through behind the Signal-input signal of conditioning a back level internal circuit shock effect being reduced greatly.Simultaneously, be to improve the defencive function reliability, in this module, added the surge protection circuit of forming by quick TVS pipe SM05T1 again, more than totally 4 groups of clamped protections of overvoltage high speed, redundant abundant.
Shown in Fig. 3-2, be the circuit theory diagrams of input signal conditioning module among Fig. 2.Square-wave pulse input signal P from tested cable fault flash tester 7
InAfter entering the standard set-up signal input terminal, though form small leak pulse signal Signal-input through cable core Multiplexing module 2, but direction, amplitude are all at random, need through shaping, relatively to nurse one's health to form the Transistor-Transistor Logic level signal, form time-delay with the triggering late-class circuit and feed back waveform.In signal condition module 3, the one tunnel offers direct impulse detection high-speed comparator U6 after the preliminary dividing potential drop of Signal-input signal process resistance, and one the tunnel offers negative-going pulse detection high-speed comparator U9.Wherein, the threshold voltage of forward comparison loop is regulated by RW1, a little more than 0V, the threshold voltage of negative sense comparison loop is regulated by RW2, a little less than 0V, no matter Signal-input is positive and negative pulse signal, all can form a forward TTL pulse signal like this, two pulse signals is through obtaining TTL triggering level signal TTL-input at a high speed or behind the door U7.This TTL-input signal is actually the response signal of Signal-input, and it mainly acts on is the TTL signal that the plus or minus hopping edge of Signal-input signal is converted to positive transition.
Referring to shown in Fig. 3-3 being the theory diagram of signal lag feedback module among Fig. 2.Under prime TTL-input triggered, the control module 1 that constitutes based on TMS320F2812 at first preset delay requirement according to host computer, based on the steady clock delay of height and feed back one road precision time delay gating pulse Delay-ctrl.This control wave can directly feed back output, also can be used as trigger pip and starts DDS chip outputting high quality differential sine wave shape fast.In this way, this standard set-up can form precision time delay feedback waveform Delay-back, and this feedback waveform can also can be sine wave for square wave.The DDS chip adopts the AD AD9951 of company, and the difference sinusoidal signal of its output is through nursing one's health into single-ended sinusoidal signal based on the high-speed-differential amplifying circuit of OPA695; Digital regulation resistance adopts the XICOR X9110 of company, is mainly used in the controlling party wave amplitude.
Shown in Fig. 3-4, be the circuit theory diagrams of amplification of Fig. 2 high speed and driver module.The precision time delay feedback waveform Delay-back that aforementioned signal lag feedback module 4 produces, high-speed broadband amplifier OPA693 through fixed gain further improves driving force again, its output signal and Signal-input are same electrical nodes, this signal will feed back on the cable core terminal through cable core Multiplexing module 2, finally form time domain output pulse signal P
Out
Claims (1)
1. cable failure flash detector calibrating device, comprise host computer and slave computer, it is characterized in that: the core circuit of slave computer mainly comprises: control module, the cable core Multiplexing module, the input signal conditioning module, the signal lag feedback module, amplify at a high speed and driver module, each intermodule relation is: tested cable fault flash tester stube cable heart yearn Multiplexing module, the cable core Multiplexing module, the input signal conditioning module, control module, the signal lag feedback module, amplification and driver module connect successively at a high speed, amplify at a high speed and driver module connection input signal conditioning module;
Control module mainly is made of digital signal processor and communication chip, and digital signal processor connects communication chip;
The cable core Multiplexing module mainly is made of the clamped holding circuit that quick TVS pipe and fast diode are formed;
The input signal conditioning module mainly by high-speed comparator and at a high speed or door constitute, high-speed comparator connects at a high speed or door;
The signal lag feedback module mainly is made up of the DDS chip, high-speed-differential amplifying circuit, the digital regulation resistance that connect successively;
Amplify at a high speed and driver module, this module realizes based on the high-speed broadband amplifier of fixed gain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102250759A CN101706564B (en) | 2009-11-19 | 2009-11-19 | Cable failure flash detector calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102250759A CN101706564B (en) | 2009-11-19 | 2009-11-19 | Cable failure flash detector calibrating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101706564A CN101706564A (en) | 2010-05-12 |
| CN101706564B true CN101706564B (en) | 2011-12-14 |
Family
ID=42376802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102250759A Active CN101706564B (en) | 2009-11-19 | 2009-11-19 | Cable failure flash detector calibrating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101706564B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103135084B (en) * | 2013-02-05 | 2016-04-06 | 国网四川省电力公司电力科学研究院 | The touring calibrating experimental system of a kind of power transmission and transformation State Overhaul Test equipment |
| CN103487722A (en) * | 2013-08-02 | 2014-01-01 | 深圳市智远能科技有限公司 | Distributed cable state detection system based on TDR |
| CN107290632A (en) * | 2017-07-31 | 2017-10-24 | 崔旭涛 | A kind of portable aviation cable fault test system |
| CN113359080A (en) * | 2021-07-08 | 2021-09-07 | 国网浙江省电力有限公司电力科学研究院 | Fault test distance error calibration method for cable fault flash tester |
-
2009
- 2009-11-19 CN CN2009102250759A patent/CN101706564B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101706564A (en) | 2010-05-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101706564B (en) | Cable failure flash detector calibrating device | |
| CN204215023U (en) | Terminal charge parameter testing line | |
| WO2017113550A1 (en) | Operational amplifier, driver interface, measuring and control device, driver circuit and driver | |
| CN110118911B (en) | USBC cable test circuit | |
| CN204788900U (en) | Solar simulator irradiance, irradiation homogeneity and stable detection device | |
| CN102401875A (en) | Test circuit for flexible printed circuit board | |
| CN204945296U (en) | A kind of cellular phone data line tester | |
| CN201555943U (en) | Detector for cable fault flash detection instrument | |
| CN203117295U (en) | Resistance value detection circuit and device | |
| CN101303384B (en) | Test device and test method of rapid response electronic device response speed | |
| CN201311330Y (en) | PT100 temperature measurement circuit | |
| CN202652655U (en) | Led constant current drive circuit | |
| CN204188299U (en) | Multichannel IGBT inner NTC high temperature real-time detection circuit | |
| CN202332865U (en) | Photovoltaic confluence and current monitoring structure | |
| CN102346216A (en) | Circuit capable of realizing accurate measurement of alternating current zero-crossing signal by using linear opticalcoupler | |
| CN202928715U (en) | Temperature transmitter with self-detecting function | |
| CN211786101U (en) | Infrared range sensor | |
| CN206164501U (en) | Pulse interface circuit | |
| CN202182914U (en) | A circuit utilizing a linear optical coupler to realize accurate measurement of AC zero passage signals | |
| CN206848406U (en) | A kind of defeated glue trunnion electrical connection RTA reliability test assembly | |
| CN202661096U (en) | Device for rapidly detecting faults of instrument system | |
| CN103116075B (en) | Intelligent phase-checking device for P-type power distribution station | |
| CN102331274B (en) | Data acquisition circuit | |
| CN220231953U (en) | Socket tester | |
| CN207181439U (en) | A kind of calibrating installation of Kindling paper burning velocity detecting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |