CN103135038A - Alternative current electric crosstalk and insulation fault monitoring line selection method of direct current system - Google Patents

Alternative current electric crosstalk and insulation fault monitoring line selection method of direct current system Download PDF

Info

Publication number
CN103135038A
CN103135038A CN2013100402236A CN201310040223A CN103135038A CN 103135038 A CN103135038 A CN 103135038A CN 2013100402236 A CN2013100402236 A CN 2013100402236A CN 201310040223 A CN201310040223 A CN 201310040223A CN 103135038 A CN103135038 A CN 103135038A
Authority
CN
China
Prior art keywords
loop
voltage
monitoring
master controller
current
Prior art date
Application number
CN2013100402236A
Other languages
Chinese (zh)
Other versions
CN103135038B (en
Inventor
赵应龙
王伟
曾建斌
Original Assignee
广州优维电子科技有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 广州优维电子科技有限公司 filed Critical 广州优维电子科技有限公司
Priority to CN201310040223.6A priority Critical patent/CN103135038B/en
Publication of CN103135038A publication Critical patent/CN103135038A/en
Application granted granted Critical
Publication of CN103135038B publication Critical patent/CN103135038B/en

Links

Abstract

The invention relates to an alternative current electric crosstalk and insulation fault monitoring line selection method of a direct current system. The direct current system is formed by an upper computer, a monitoring device, a sampling system and a current sensor. The alternative current electric crosstalk and insulation fault monitoring line selection method includes the steps of extracting a ripple crest value in the direct current system through extracting of an alternating component effective value, adopting the alternative current and direct current component separation digital filtering technology, the direct current leakage current detection technology, the recommend standard 485 (RS485) isolation communication technology and the fast fourier transform algorithm (FFT) conversion technology to monitor system bus over-the-ground alternative and direct current voltage and a ripple voltage peak value in real time to give an alarm, receiving loop leakage current information uploaded by a data collector, carrying out intelligent analysis through mode matching technology, calculating grounding resistance, carrying out artificial intelligence mode matching on feature status information of each loop and configured feature rules in the system, enabling the alternative current electric crosstalk faults, ripple voltage peak value monitoring data, grounding fault and insulation fault loop status information, loop information and the like which to be displayed on a liquid crystal display, assisting operation and maintenance workers to accurately know the current status to rapidly remove the faults.

Description

Straight-flow system exchanges crosstalk and insulation fault monitoring selection method

Technical field

The present invention relates to the straight-flow system detection method, specifically a kind of straight-flow system exchanges crosstalk and insulation fault monitoring selection method.

Background technology

Interchange crosstalk fault in straight-flow system refers to the situation that the phase line in alternating current directly or indirectly is connected with the negative or positive electrode of straight-flow system.Occuring to exchange the crosstalk fault in straight-flow system is caused by following two kinds of reasons usually: 1, maintainer's maloperation; 2, the equipment that contains Alternating Current Power Supply in straight-flow system breaks down and causes exchanging crosstalk.Straight-flow system exchanges the crosstalk fault and is different from common earth fault; in when, in straight-flow system, common earth fault occuring; single-point grounding can not work the mischief usually; and only just might bring the misoperation of protection or tripping to do when 2 earth fault occurs; therefore after one-point grounding fault occured, the maintainer also had the sufficient time to process.And straight-flow system exchanges the crosstalk fault in case generation namely might cause the misoperation of protection, and the probability of this harm generation will be far longer than common earth fault, so in a single day the processing immediately of crosstalk fault occurs to exchange in system.The tradition insulation monitoring and warning device is all the average voltage method to the sampling of DC voltage usually, for without in the situation that exchanges crosstalk, sample without any problem, but after crosstalk occurs to exchange, the direct current sampling is just forbidden.

In existing checkout equipment, there is in straight-flow system the problem that the crosstalk loop can't accurately be located, exchanges crosstalk and insulation fault route selection difficulty in inaccurate, the straight-flow system of straight-flow system voltage acquisition under being exchanged the crosstalk situation that exchanges.

Summary of the invention

The object of the invention is to the problem and shortage for above-mentioned existence, provide a kind of straight-flow system to exchange crosstalk and insulation fault monitoring selection method, effectively solve exchange in straight-flow system that crosstalk can not in time be found and processing, straight-flow system in exchange the problem that the crosstalk loop can't accurately be located, exchanges crosstalk and insulation fault route selection difficulty in inaccurate, the straight-flow system of straight-flow system voltage acquisition under being exchanged the crosstalk situation.

Technical scheme of the present invention is achieved in that

A kind of straight-flow system exchanges crosstalk and insulation fault monitoring selection method, comprises the steps:

(a), formed by host computer, monitoring device, sampling system and direct current transducer, described monitoring device comprises master controller, master controller is provided with liquid crystal display, master controller is the key control unit of whole system, is provided with the main interface of DA output module, data memory module, LCD display module, keyboard load module, monitor message demonstration and configuration information input; Direct current transducer is arranged on each transmission line circuit of each liquid crystal display place exit of each loop insurance (generally); Described sampling system comprises data acquisition unit, and data acquisition unit is selected the installation site as required between master controller and direct current transducer; Adopt star connection or chain to connect two kinds of link models between master controller and data acquisition unit, each data acquisition unit both can directly link by the RS485 bus with master controller, also can indirectly link by cascade port and the master controller of another data acquisition unit, be convenient to install and wiring; Communication between master controller and data acquisition unit is determined by the unique address code of data acquisition unit, and the physical location of data acquisition unit is irrelevant, and configuration has brought the dirigibility of height to fielded system; Master controller and data acquisition unit can charged hot plugs, and master controller is the recognition data collector automatically, need not manually arrange; Each data acquisition unit can articulate a plurality of (8) direct current transducer, by after special purpose interface access data collector, data acquisition unit can be identified direct current transducer automatically, need not manually arrange when direct current transducer;

(b), extract the AC compounent effective value, the inner high-pass filtering circuit that adopts of monitoring device extracts the alternating voltage over the ground in straight-flow system, then converts alternating voltage to DC voltage by the real effective conversion chip, gives the processor sampling system;

(c), the ripple peak-to-peak value in the extraction straight-flow system, the inner high-pass filtering circuit that adopts of monitoring device extracts the alternating voltage over the ground in straight-flow system, go out the AC ripple peak-to-peak value through high-speed sampling circuit extraction independently, give the processor analysis, the band of high-speed sampling circuit is wider than 20MHz;

(d), adopt the alternating current-direct current component to separate digital filtering technique, specifically at inner high pass and the low-pass filter circuit of adopting of monitoring device, the alternating current-direct current component is separated, DC voltage is given the processor sampling system after through biasing;

(e), adopt the DC leakage current detection technique, after specifically occuring in straight-flow system to exchange the crosstalk fault, show as a large amount of power frequency ac voltages in system, crosstalk one utmost point DC voltage over the ground descends; Produced DC leakage current by the crosstalk loop on feeder line, by can realize exchanging the route selection function in crosstalk loop to the Real-Time Monitoring of this leakage current; The route selection in crosstalk loop, after straight-flow system occurs to exchange the crosstalk fault, interchange crosstalk loop has shown obvious earth fault, exchange the crosstalk fault monitoring system one high precision DC current sensor is housed on every tested feeder line, the DC leakage current sensor has good filtration to AC signal;

(f), adopt RS485 isolated communication technology and quick FFT converter technique, under signal mode, monitoring device applies a low frequency small-signal source in the mode of constant current source to straight-flow system by DA conversion module and constant current signal output module, signal frequency 0.125 Hz, 0.25Hz, 0.5Hz, 1Hz is optional, waveform is sinusoidal wave, and monitoring device gathers voltage-to-ground and extracts the signal voltage amplitude of signal frequency point by quick FFT conversion; Data acquisition unit carries out extracting after the FFT conversion marking current amplitude of signal frequency point to the leak source stream of each feeder line, isolate uploading to monitoring device by RS485, and monitoring device voltage magnitude and current amplitude calculate the insulation resistance of each monitoring circuit;

(g), master controller real-time monitoring system Bus Voltage, comprise system voltage, over against ground voltage, negative voltage-to-ground and interchange crosstalk voltage also show in real time, when straight-flow system breaks down, system voltage is higher or on the low side to be surpassed when presetting setting valve, or alternating voltage surpasses master controller liquid crystal display display alarm information when presetting setting valve, the alarm simultaneously of voltage out-of-limit pilot lamp and hummer, warning information also can upload to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface;

(h), master controller real-time monitoring system bus earth impedance, comprise over against earth resistance, negative resistance to earth also shows in real time, when straight-flow system breaks down, positive and negative voltage-to-ground no longer balance also surpasses when presetting setting valve, master controller liquid crystal display display alarm information, the alarm simultaneously of system earth pilot lamp and hummer, warning information also can upload to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface;

(j), each loopback diagnostic status information of uploading of the real-time receive data collector of master controller, and carry out intellectual analysis by mode-matching technique, distinguish different ground states, the removal system charging pulse disturbs, the impact that the fluctuating level disturbs and loop brings, final accurately judgement ground loop, and calculate impedance ground, impedance ground numerical value shows at liquid crystal display, and can upload to complex automatic system or dispatch automated system host computer by the RS485 interface;

(j), master controller is by carrying out the artificial intelligence pattern match with the built-in feature rule of eigenstate information and system in every loop; the fault loop that system is existed, improper loop, system's dual power supply each other standby loop, with loop and the loop ground loop of loop; perfect loop circuit state information is provided; and be shown on liquid crystal display; effectively help the O﹠M personnel accurately to understand the current state of straight-flow system, promptly fix a breakdown.

Further, the extracting method of the present invention to the alternating current-direct current component: the AC compounent that effectively proposes in straight-flow system is the emphasis that the present invention solves, and has selected the real effective sample circuit to extract Alternating Component in direct current.AC compounent in direct current is extracted process flow diagram as shown in Figure of description 2, and real effective extracts circuit can convert alternating voltage to DC level accurately.Sampling system is given the processor analysis with sampled data after completing the sample mean of per second 10000 times, and processor is presented at man-machine interface and sound and light alarm according to result of calculation.Exchange the crosstalk fault monitoring system except gathering accurately alternating voltage, the Measurement accuracy of DC voltage is also extremely important.For the insulation monitoring and warning device that does not exchange the crosstalk fault detect, collection to DC voltage is all the average electrical platen press usually, in case sealed in AC compounent in straight-flow system, the DC voltage sampling deviation is very large, thereby cause grid grounding impedance measurement inaccurate, cause wrong report or do not report.

The accuracy of DC voltage sampling when further, the present invention has adopted multistage filtering and voltage bias method to guarantee to exchange crosstalk in the direct current sampling that exchanges the crosstalk fault monitoring system.Realize that theory diagram is as shown in Figure of description 3, when sealing in alternating current in straight-flow system, the most AC signal of second-order filter circuit classified filtering, certain alternating voltage relatively through be after dc bias circuit on the occasion of, sampling system deducts at last inclined to one side threshold voltage and restores accurately real DC voltage through after long-time average, the AC signal of symmetry being filtered.

Further, the route selection in crosstalk of the present invention loop after straight-flow system occurs to exchange the crosstalk fault, exchanges the crosstalk loop and has shown obvious earth fault.Exchange the crosstalk fault monitoring system one high precision DC current sensor is housed on every tested feeder line, the DC leakage current sensor has good filtration to AC signal.As shown in Figure of description 4, middle feeder line 1 is normal feeder line, and feeder line n exchanges crosstalk fault loop, R for existing xBe the crosstalk internal resistance, R is the system balancing electric bridge.If the load current size is I l, system is Vcc over against ground voltage, negative voltage-to-ground is Vss, and in feeder line 1, I l=I 2=I l, it is I that A surveys size of current in the place l-I 2=0; In feeder line n, I 3=I 4=I l, , it is I that B surveys size of current in the place 5, according to system voltage size and sensor current size, can calculate and exchange the crosstalk internal resistance.

System of the present invention has following function: real-time monitoring system voltage and alarm, real-time monitoring system insulation and alarm, real-time earthing loop detection, system's loop detection diagnosis, loop insulation grading forewarning system and ground connection historical record are analyzed.

Voltage monitoring: master controller (main frame) real-time monitoring system Bus Voltage, comprise system voltage, over against ground voltage, negative voltage-to-ground and interchange crosstalk voltage also show in real time.When straight-flow system breaks down, system voltage is higher or on the low side when surpassing default setting valve, or alternating voltage main frame liquid crystal display display alarm information when surpassing default setting valve, the alarm simultaneously of voltage out-of-limit pilot lamp and hummer.Warning information also can upload to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface.

Insulated monitoring: main frame real-time monitoring system bus earth impedance, comprise over against earth resistance, negative resistance to earth also shows in real time.When straight-flow system breaks down, positive and negative voltage-to-ground is balance and when surpassing default setting valve no longer, master controller (main frame) liquid crystal display display alarm information, the alarm simultaneously of system earth pilot lamp and hummer.Warning information also can upload to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface.

Ground connection is detected: each loopback diagnostic status information that the real-time receive data collector (handset) of master controller (main frame) is uploaded, and carry out intellectual analysis by mode-matching technique, distinguish different ground states, the removal system charging pulse disturbs, the impact that the fluctuating level disturbs and loop brings, final accurately judgement ground loop, and calculate impedance ground.Impedance ground numerical value shows at liquid crystal display, and can upload to complex automatic system or dispatch automated system host computer by the RS485 interface.

The loop diagnosis: the electric power dc loop circuit is ubiquitous, and brings great interference for the location of earth fault.Master controller (main frame) is by carrying out the artificial intelligence pattern match with the built-in feature rule of eigenstate information and system in every loop; introduce first the concept of loop index; the fault loop that system is existed, improper loop, system's dual power supply each other standby loop, with loop and the loop ground loop of loop; perfect loop circuit state information is provided, and is shown on liquid crystal display.Can effectively help the O﹠M personnel accurately to understand the current state of straight-flow system, promptly fix a breakdown.

Insulation early warning: because the accuracy of detection of master controller (main frame) is high, more than can reaching 500K, therefore can judge by the earth impedance that detects unearthed loop the trend of its secular variation, the early warning information of loop ground connection is provided.Insulation reduction early warning and the monitoring of loop coupling provide effective means for the diagnosis of system.

Historical record: the system earth record will be kept in EEPROM automatically for consulting.This record has comprised the time on date of ground connection, impedance ground, but preserve after the information such as ground loop and power down.Historical record has also comprised the time on date that exchanges crosstalk, but preserves after the information such as crosstalk voltage and power down.

Straight-flow system interchange crosstalk malfunction monitoring of the present invention and line selection apparatus are in real time except after detecting the common earth fault of straight-flow system, the alternating voltage component in the Real-Time Monitoring straight-flow system also, in case the out-of-limit alarm signal of namely sending of alternating voltage detected, and realize exchanging the route selection function in crosstalk loop, help maintainer's quick solution fault, greatly improved the security and stability of straight-flow system.

The present invention can effectively solve in straight-flow system the problem that exchanges crosstalk and can not in time find and process, solve and exchange the problem that the crosstalk loop can't accurately be located in straight-flow system; Solution is exchanging the inaccurate problem of straight-flow system voltage acquisition in the crosstalk situation; Solved and exchanged the problem of crosstalk and insulation fault route selection difficulty in the straight-flow system.

The present invention is further illustrated below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is system architecture schematic diagram of the present invention;

Fig. 2 is that the AC compounent in direct current of the present invention is extracted process flow diagram;

Fig. 3 is that the present invention exchanges the theory diagram of realizing that has adopted multistage filtering and voltage bias method in the direct current sampling of crosstalk fault monitoring system;

Fig. 4 is the route selection schematic diagram in crosstalk of the present invention loop.

Embodiment

As shown in Fig. 1-4, the present invention is that a kind of straight-flow system exchanges crosstalk and insulation fault monitoring selection method, comprises the steps:

(a), formed by host computer, monitoring device, sampling system and direct current transducer, monitoring device comprises master controller, master controller is provided with liquid crystal display, and master controller is the key control unit of whole system, is provided with the main interface that monitor message shows and configuration information is inputted; Direct current transducer is arranged on each feeder line and shields each transmission line circuit place (generally exit that each loop sky is opened); Sampling system comprises data acquisition unit, and data acquisition unit is selected the installation site as required between master controller and direct current transducer; Adopt star connection or chain to connect two kinds of link models between master controller and data acquisition unit, each data acquisition unit both can directly link by the RS485 bus with master controller, also can indirectly link by cascade port and the master controller of another data acquisition unit, be convenient to install and wiring; Communication between master controller and data acquisition unit is determined by the unique address code of data acquisition unit, and the physical location of data acquisition unit is irrelevant, and configuration has brought the dirigibility of height to fielded system; Master controller and data acquisition unit can charged hot plugs, and master controller is the recognition data collector automatically, need not manually arrange; Each data acquisition unit can articulate 8 direct current transducers, and by after special purpose interface access data collector, data acquisition unit can be identified direct current transducer automatically, need not manually arrange when direct current transducer;

(b), the AC compounent effective value in the extraction straight-flow system, the inner high-pass filtering circuit that adopts of monitoring device extracts the alternating voltage over the ground in straight-flow system, convert alternating voltage to DC voltage by the real effective conversion chip again, give the processor sampling system;

(c), extract the AC compounent ripple peak-to-peak value in straight-flow system, the inner high-pass filtering circuit that adopts of monitoring device extracts the alternating voltage over the ground in straight-flow system, then by high-speed sampling module independently with the ripple peak-to-peak value in straight-flow system out;

(d), adopt the alternating current-direct current component to separate digital filtering technique, specifically at inner high pass and the low-pass filter circuit of adopting of monitoring device, the alternating current-direct current component is separated, DC voltage is given the processor sampling system after through biasing;

(e), adopt the DC leakage current detection technique, after specifically occuring in straight-flow system to exchange the crosstalk fault, show as a large amount of power frequency ac voltages in system, crosstalk one utmost point DC voltage over the ground descends; Produced DC leakage current by the crosstalk loop on feeder line, by can realize exchanging the route selection function in crosstalk loop to the Real-Time Monitoring of this leakage current; The route selection in crosstalk loop, after straight-flow system occurs to exchange the crosstalk fault, interchange crosstalk loop has shown obvious earth fault, exchange the crosstalk fault monitoring system one high precision DC current sensor is housed on every tested feeder line, the DC leakage current sensor has good filtration to AC signal;

(f), adopt RS485 isolated communication technology and quick FFT converter technique, under signal mode, monitoring device applies a low frequency small-signal source in the mode of constant current source to straight-flow system by DA conversion module and constant current signal output module, signal frequency 0.125Hz, 0.25Hz, 0.5Hz, 1Hz is optional, waveform is sinusoidal wave, and monitoring device gathers voltage-to-ground and extracts the signal voltage amplitude of signal frequency point by quick FFT conversion; Data acquisition unit carries out extracting after the FFT conversion marking current amplitude of signal frequency point to the leak source stream of each feeder line, isolate uploading to monitoring device by RS485, and monitoring device voltage magnitude and current amplitude calculate the insulation resistance of each monitoring circuit;

(g), master controller real-time monitoring system Bus Voltage, comprise system voltage, over against ground voltage, negative voltage-to-ground and interchange crosstalk voltage also show in real time, when straight-flow system breaks down, system voltage is higher or on the low side to be surpassed when presetting setting valve, or alternating voltage surpasses master controller liquid crystal display display alarm information when presetting setting valve, the alarm simultaneously of voltage out-of-limit pilot lamp and hummer, warning information also can upload to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface;

(h), master controller real-time monitoring system bus earth impedance, comprise over against earth resistance, negative resistance to earth also shows in real time, when straight-flow system breaks down, positive and negative voltage-to-ground no longer balance also surpasses when presetting setting valve, master controller liquid crystal display display alarm information, the alarm simultaneously of system earth pilot lamp and hummer, warning information also can upload to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface;

(i), each loopback diagnostic status information of uploading of the real-time receive data collector of master controller, and carry out intellectual analysis by mode-matching technique, distinguish different ground states, the removal system charging pulse disturbs, the impact that the fluctuating level disturbs and loop brings, final accurately judgement ground loop, and calculate impedance ground, impedance ground numerical value shows at liquid crystal display, and can upload to complex automatic system or dispatch automated system host computer by the RS485 interface;

(j), master controller is by carrying out the artificial intelligence pattern match with the built-in feature rule of eigenstate information and system in every loop; the fault loop that system is existed, improper loop, system's dual power supply each other standby loop, with loop and the loop ground loop of loop; perfect loop circuit state information is provided; and be shown on liquid crystal display; effectively help the O﹠M personnel accurately to understand the current state of straight-flow system, promptly fix a breakdown.

System of the present invention has following function: real-time monitoring system voltage and alarm, real-time monitoring system insulation and alarm, real-time earthing loop detection, system's loop detection diagnosis, loop insulation grading forewarning system and ground connection historical record are analyzed.

Voltage monitoring: master controller real-time monitoring system Bus Voltage, comprise system voltage, over against ground voltage, negative voltage-to-ground and interchange crosstalk voltage also show in real time.When straight-flow system breaks down, system voltage is higher or on the low side when surpassing default setting valve, or alternating voltage main frame liquid crystal display display alarm information when surpassing default setting valve, the alarm simultaneously of voltage out-of-limit pilot lamp and hummer.Warning information also can upload to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface.

Insulated monitoring: master controller real-time monitoring system bus earth impedance, comprise over against earth resistance, negative resistance to earth also shows in real time.When straight-flow system breaks down, positive and negative voltage-to-ground is balance and when surpassing default setting valve no longer, master controller liquid crystal display display alarm information, the alarm simultaneously of system earth pilot lamp and hummer.Warning information also can upload to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface.

Ground connection is detected: each loopback diagnostic status information that the real-time receive data collector of master controller is uploaded, and carry out intellectual analysis by mode-matching technique, distinguish different ground states, the removal system charging pulse disturbs, the impact that the fluctuating level disturbs and loop brings, final accurately judgement ground loop, and calculate impedance ground.Impedance ground numerical value shows at liquid crystal display, and can upload to complex automatic system or dispatch automated system host computer by the RS485 interface.

The loop diagnosis: the electric power dc loop circuit is ubiquitous, and brings great interference for the location of earth fault.Master controller is by carrying out the artificial intelligence pattern match with the built-in feature rule of eigenstate information and system in every loop; introduce first the concept of loop index; the fault loop that system is existed, improper loop, system's dual power supply each other standby loop, with loop and the loop ground loop of loop; perfect loop circuit state information is provided, and is shown on liquid crystal display.Can effectively help the O﹠M personnel accurately to understand the current state of straight-flow system, promptly fix a breakdown.

Insulation early warning: because the accuracy of detection of master controller is high, more than can reaching 500K, therefore can judge by the earth impedance that detects unearthed loop the trend of its secular variation, the early warning information of loop ground connection is provided.Insulation reduction early warning and the monitoring of loop coupling provide effective means for the diagnosis of system.

Historical record: the system earth record will be kept in EEPROM automatically for consulting.This record has comprised the time on date of ground connection, impedance ground, but preserve after the information such as ground loop and power down.Historical record has also comprised the time on date that exchanges crosstalk, but preserves after the information such as crosstalk voltage and power down.

Product of the present invention has following architectural feature: ground connection is recorded 1000 of the maximum preservations of number.IO interface.The formula of cruising man-machine interface, the brick pattern menu, operation is succinct, and is powerful.Many group LED system states show, the communications status demonstration.Built-in double-tone buzzer warning.The output of many group YX switching values.The RS485 communication interface.

Anti-interference processing method of the present invention: because the DC earthing leakage current is very small signal, in order to obtain test result accurately, must resists at test process and do anti-processing.

Interference source is analyzed: interference source may from the outside, may be also that test circuit itself produces;

Outside: external interference source comprises large current interference that straight-flow system distributed capacitance, dual power supply loop produces, high-frequency switching power supply module interference, external magnetic field interference etc.;

Inner: sensor zero point drift, the linearity.

The form of expression of disturbing: interference may occur with different forms, disturbs at dynamic load in thread environment or radio frequency once in a while (RF), might produce random Transient Noise;

The conducting AC ripple that charging circuit produces or electric wire produce the radiation crosslinking noise, might cause periodically noise.

The processing of the present invention to disturbing:

A. the hardware design and the Software for Design that utilizes the anti-Noise Theory of communicating by letter that adopt double-deck anti-distributed capacitance to disturb can be eliminated the interference of straight-flow system distributed capacitance, the interference of electromagnetic pulse and the impact of other noise;

B. the inner sample circuit of systematic analysis instrument all adopts high precision isolation operational amplifier, to reduce straight-flow system to the interference of master controller;

C. adopt the high resolving power direct current transducer as signal input sources, direct current transducer itself has very strong antijamming capability on the one hand, and high resolving power is conducive to improve signal to noise ratio (S/N ratio) on the other hand;

D. adopt single 16 bit CPUs, the output data of 16 high-speed A/D converters of 10 passages are carried out pre-service and preanalysis, the AD converter front end carries out buffer protection by the signal conditioning circuit that high-operational amplifier consists of.

The key technical indexes of the present invention:

Can monitor insulation against ground resistance value scope: impedance ground: 0-50K; Insulation reduces: 51-500K.

But monitoring voltage scope:

Over against ground voltage: 0-300V;

Negative voltage-to-ground: 0-300V;

System's total voltage: 0-300V;

Exchange crosstalk voltage: 0-300V;

Ripple peak-to-peak value voltage: 0-20V.

Anti-straight-flow system distributed capacitance disturbs: greater than 10000uF.

Applicable straight-flow system electric pressure: 220V, 110V, 48V, 24V or user propose other voltage etc.

Level.

Can monitor the DC loop number: the 500 tunnel.

Main frame access straight-flow system earth impedance value: greater than 1000 K.

The voltage monitoring error is less than 0.2%.

The insulation against ground alarm, band YX output contact.

System voltage hangs down Threshold Crossing Alert, band YX output contact.

The high Threshold Crossing Alert of system voltage, band YX output contact.

Standard RS232/RS485/RS422 interface is with complex automatic system, dispatch automated system interface.

Operating ambient temperature :-30 ℃-+50 ℃.

Relative humidity :≤96%.

Above-described embodiment is the better embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, within being included in protection scope of the present invention.

Claims (1)

1. a straight-flow system exchanges crosstalk and insulation fault monitoring selection method, it is characterized in that: comprise the steps:
(a), formed by host computer, monitoring device, sampling system and current sensor, described monitoring device comprises master controller, master controller is provided with liquid crystal display, master controller is the key control unit of whole system, is provided with the main interface of DA output module, data memory module, LCD display module, keyboard load module, monitor message demonstration and configuration information input; Current sensor is arranged on each feeder line and shields each transmission line circuit place; Described sampling system comprises data acquisition unit, and data acquisition unit is selected the installation site as required between master controller and current sensor; Adopt star connection or chain to connect two kinds of link models between master controller and data acquisition unit, each data acquisition unit and master controller directly link by the RS485 bus, or indirectly link by cascade port and the master controller of another data acquisition unit, be convenient to install and wiring; Communication between master controller and data acquisition unit is by the unique address code decision of data acquisition unit, and the automatic recognition data collector of master controller need not manually arrange; Each data acquisition unit articulates a plurality of current sensors, and by after special purpose interface access data collector, data acquisition unit can be identified current sensor automatically, need not manually arrange when current sensor;
(b), extract the AC compounent effective value, the inner high-pass filtering circuit that adopts of monitoring device extracts the alternating voltage over the ground in straight-flow system, then converts alternating voltage to DC voltage by the real effective conversion chip, gives the processor sampling system;
(c), the ripple peak-to-peak value in the extraction straight-flow system, the inner high-pass filtering circuit that adopts of monitoring device extracts the alternating voltage over the ground in straight-flow system, go out the AC ripple peak-to-peak value through high-speed sampling circuit extraction independently, give the processor analysis, the band of high-speed sampling circuit is wider than 20MHz;
(d), adopt the alternating current-direct current component to separate digital filtering technique, specifically at inner high pass and the low-pass filter circuit of adopting of monitoring device, the alternating current-direct current component is separated, DC voltage is given the processor sampling system after through biasing;
(e), adopt the DC leakage current detection technique, after specifically occuring in straight-flow system to exchange the crosstalk fault, show as a large amount of power frequency ac voltages in system, crosstalk one utmost point DC voltage over the ground descends; Produced DC leakage current by the crosstalk loop on feeder line, by can realize exchanging the route selection function in crosstalk loop to the Real-Time Monitoring of this leakage current; The route selection in crosstalk loop, after straight-flow system occurs to exchange the crosstalk fault, interchange crosstalk loop has shown obvious earth fault, exchange the crosstalk fault monitoring system one high precision DC current sensor is housed on every tested feeder line, the DC leakage current sensor has good filtration to AC signal;
(f), adopt RS485 isolated communication technology and quick FFT converter technique, under signal mode, monitoring device applies a low frequency small-signal source in the mode of constant current source to straight-flow system by DA conversion module and constant current signal output module, signal frequency 0.125 Hz, 0.25Hz, 0.5Hz, 1Hz is optional, waveform is sinusoidal wave, and monitoring device gathers voltage-to-ground and extracts the signal voltage amplitude of signal frequency point by quick FFT conversion; Data acquisition unit carries out extracting after the FFT conversion marking current amplitude of signal frequency point to the leak source stream of each feeder line, isolate uploading to monitoring device by RS485, and monitoring device voltage magnitude and current amplitude calculate the insulation resistance of each monitoring circuit;
(g), master controller real-time monitoring system Bus Voltage, comprise system voltage, over against ground voltage, negative voltage-to-ground and interchange crosstalk voltage, ripple peak-to-peak value voltage also shows in real time, when straight-flow system breaks down, system voltage is higher or on the low side to be surpassed when presetting setting valve, or alternating voltage or ripple peak-to-peak value voltage master controller liquid crystal display display alarm information when surpassing default setting valve, the alarm simultaneously of voltage out-of-limit pilot lamp and hummer, warning information also can upload to complex automatic system or dispatch automated system host computer by switching value and RS485 interface,
(h), master controller real-time monitoring system bus earth impedance, comprise over against earth resistance, negative resistance to earth also shows in real time, when straight-flow system breaks down, positive and negative voltage-to-ground no longer balance also surpasses when presetting setting valve, master controller liquid crystal display display alarm information, the alarm simultaneously of system earth pilot lamp and hummer, warning information also can upload to complex automatic system or dispatch automated system host computer by switching value and RS485 interface;
(i), each loopback diagnostic status information of uploading of the real-time receive data collector of master controller, and carry out intellectual analysis by mode-matching technique, distinguish different ground states, the removal system charging pulse disturbs, the impact that the fluctuating level disturbs and loop brings, final accurately judgement ground loop, and calculate impedance ground, impedance ground numerical value shows at liquid crystal display, and can upload to complex automatic system or dispatch automated system host computer by the RS485 interface;
(j), master controller is by carrying out the artificial intelligence pattern match with the built-in feature rule of eigenstate information and system in every loop; the fault loop that system is existed, improper loop, system's dual power supply each other standby loop, with loop and the loop ground loop of loop; perfect loop circuit state information is provided; and be shown on liquid crystal display; effectively help the O﹠M personnel accurately to understand the current state of straight-flow system, promptly fix a breakdown.
CN201310040223.6A 2013-02-01 2013-02-01 Straight-flow system exchanges crosstalk and insulation fault monitoring selection method CN103135038B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310040223.6A CN103135038B (en) 2013-02-01 2013-02-01 Straight-flow system exchanges crosstalk and insulation fault monitoring selection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310040223.6A CN103135038B (en) 2013-02-01 2013-02-01 Straight-flow system exchanges crosstalk and insulation fault monitoring selection method

Publications (2)

Publication Number Publication Date
CN103135038A true CN103135038A (en) 2013-06-05
CN103135038B CN103135038B (en) 2015-08-05

Family

ID=48495127

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310040223.6A CN103135038B (en) 2013-02-01 2013-02-01 Straight-flow system exchanges crosstalk and insulation fault monitoring selection method

Country Status (1)

Country Link
CN (1) CN103135038B (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103592563A (en) * 2013-11-22 2014-02-19 国家电网公司 Direct current system insulation on-line monitoring device
CN103926502A (en) * 2014-04-23 2014-07-16 国家电网公司 AC/DC electric channeling detection device of DC power source
CN104181398A (en) * 2014-09-05 2014-12-03 厦门大恒科技有限公司 Ground resistance testing device and method
CN104459291A (en) * 2014-12-15 2015-03-25 南车株洲电力机车有限公司 Method and system for detecting AC signals of specific frequency
CN104597326A (en) * 2014-12-25 2015-05-06 杭州墨锐机电科技有限公司 Real-time monitoring system for insulation of underground large-power device
CN105043457A (en) * 2015-09-16 2015-11-11 山东怡讯电气有限公司 Cable state on-line monitoring and early warning data integrated processing terminal
CN105067983A (en) * 2015-09-16 2015-11-18 山东怡讯电气有限公司 Cable insulation data online acquisition and processing system
CN105954618A (en) * 2016-05-19 2016-09-21 国网河南省电力公司济源供电公司 AC invasion DC monitoring method based on ripple analysis
CN105974257A (en) * 2016-06-14 2016-09-28 国网河南省电力公司周口供电公司 Multi-bus loop fault positioning searching device and multi-bus loop fault positioning searching method for protection loop
CN106018925A (en) * 2016-07-15 2016-10-12 广州开能电气实业有限公司 DC system intelligent sensor
CN106526323A (en) * 2016-11-04 2017-03-22 北京航天发射技术研究所 Insulation resistance detecting method based on square wave automatic compensation strategy
CN108051680A (en) * 2017-12-15 2018-05-18 佛山市校友桥网络科技有限公司 Electrical measurement note alarm module is altered in straight-flow system exchange
CN108120894A (en) * 2017-12-20 2018-06-05 广州勤正电力科技有限公司 Direct-current system loop trouble-shooting system
CN108152707A (en) * 2017-12-20 2018-06-12 广州勤正电力科技有限公司 Alternating current-direct current mixed running surveys note alarm device in DC circuit system
CN105823923B (en) * 2016-03-22 2019-07-05 成都国能龙源科技有限公司 DC feeder insulation against ground reduces and exchanges the device and method scurried into while detected

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004245600A (en) * 2003-02-10 2004-09-02 Yazaki Corp Insulation resistance detection device
CN201383667Y (en) * 2009-01-20 2010-01-13 河南新乡蓝森科技有限责任公司 DC system intelligent integrated relay
CN202177680U (en) * 2011-08-22 2012-03-28 广州优维电子科技有限公司 Portable DC earthing fault search instrument
CN202421312U (en) * 2011-12-20 2012-09-05 首瑞(北京)投资管理集团有限公司 Device for monitoring alternating current being in series connection with direct current system
CN202494775U (en) * 2012-03-28 2012-10-17 广州优维电子科技有限公司 Calibrator for DC system insulation device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004245600A (en) * 2003-02-10 2004-09-02 Yazaki Corp Insulation resistance detection device
CN201383667Y (en) * 2009-01-20 2010-01-13 河南新乡蓝森科技有限责任公司 DC system intelligent integrated relay
CN202177680U (en) * 2011-08-22 2012-03-28 广州优维电子科技有限公司 Portable DC earthing fault search instrument
CN202421312U (en) * 2011-12-20 2012-09-05 首瑞(北京)投资管理集团有限公司 Device for monitoring alternating current being in series connection with direct current system
CN202494775U (en) * 2012-03-28 2012-10-17 广州优维电子科技有限公司 Calibrator for DC system insulation device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
余育金等: "变电站直流系统接地故障分析及查找", 《广西电力》 *
陆榛等: "厂站交直流互串跳闸分析及防范措施", 《福建电力与电工》 *

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103592563A (en) * 2013-11-22 2014-02-19 国家电网公司 Direct current system insulation on-line monitoring device
CN103926502B (en) * 2014-04-23 2017-06-23 国家电网公司 A kind of alternating current-direct current of dc source alters electric detection means
CN103926502A (en) * 2014-04-23 2014-07-16 国家电网公司 AC/DC electric channeling detection device of DC power source
CN104181398A (en) * 2014-09-05 2014-12-03 厦门大恒科技有限公司 Ground resistance testing device and method
CN104459291A (en) * 2014-12-15 2015-03-25 南车株洲电力机车有限公司 Method and system for detecting AC signals of specific frequency
CN104597326A (en) * 2014-12-25 2015-05-06 杭州墨锐机电科技有限公司 Real-time monitoring system for insulation of underground large-power device
CN105043457A (en) * 2015-09-16 2015-11-11 山东怡讯电气有限公司 Cable state on-line monitoring and early warning data integrated processing terminal
CN105067983A (en) * 2015-09-16 2015-11-18 山东怡讯电气有限公司 Cable insulation data online acquisition and processing system
CN105067983B (en) * 2015-09-16 2018-01-16 山东怡讯电气有限公司 A kind of cable insulation online data acquisition processing system
CN105043457B (en) * 2015-09-16 2017-12-29 山东怡讯电气有限公司 Cable status monitors warning data integrated processing terminal on-line
CN105823923B (en) * 2016-03-22 2019-07-05 成都国能龙源科技有限公司 DC feeder insulation against ground reduces and exchanges the device and method scurried into while detected
CN105954618A (en) * 2016-05-19 2016-09-21 国网河南省电力公司济源供电公司 AC invasion DC monitoring method based on ripple analysis
CN105974257A (en) * 2016-06-14 2016-09-28 国网河南省电力公司周口供电公司 Multi-bus loop fault positioning searching device and multi-bus loop fault positioning searching method for protection loop
CN106018925A (en) * 2016-07-15 2016-10-12 广州开能电气实业有限公司 DC system intelligent sensor
CN106526323A (en) * 2016-11-04 2017-03-22 北京航天发射技术研究所 Insulation resistance detecting method based on square wave automatic compensation strategy
CN106526323B (en) * 2016-11-04 2019-03-29 北京航天发射技术研究所 A kind of insulation resistance detection method based on the automatic compensation policy of square wave
CN108051680A (en) * 2017-12-15 2018-05-18 佛山市校友桥网络科技有限公司 Electrical measurement note alarm module is altered in straight-flow system exchange
CN108120894A (en) * 2017-12-20 2018-06-05 广州勤正电力科技有限公司 Direct-current system loop trouble-shooting system
CN108152707A (en) * 2017-12-20 2018-06-12 广州勤正电力科技有限公司 Alternating current-direct current mixed running surveys note alarm device in DC circuit system

Also Published As

Publication number Publication date
CN103135038B (en) 2015-08-05

Similar Documents

Publication Publication Date Title
CN104716741B (en) Transformer station's remote supervision system and remote monitoring method thereof
CN104730410B (en) A kind of distribution line disconnection monitoring method and device based on voltage x current vector
CN102608452B (en) High speed train equipment state and electric energy quality monitoring system and method
CN102841296B (en) Online monitoring system and method for partial discharge of intelligent switch cabinet based on ultra-high frequency detection
CN202533545U (en) Power transmission network fault detection system based on internet of things technology
CN102759675B (en) On-line electric energy quality monitoring device
CN100592068C (en) SF6 gas density and micro-water integrated on-line monitor
CN101603994B (en) On-line monitoring device of metallic oxide arrester
CN201532416U (en) Intelligent cable monitor
CN103323770A (en) Device for detection of mechanical characteristics and diagnosis of faults of high-voltage circuit breaker
CN100370267C (en) On-line detecting method and its device for multiple path transient wave form over voltage of power system
CN202141769U (en) On-line monitoring and fault diagnosis system for transformer state
CN201229389Y (en) Cable sheath insulation on-line monitoring device
CN201965191U (en) Capacitor intelligentizing device
CN101120259A (en) Drain current circuit breaker and method
CN102298107A (en) Portable ultrasonic wave and cloud detection apparatus for partial discharge
CN202583315U (en) On-line monitoring system for transformer iron core grounding current
CN101581748A (en) Zinc oxide arrester on-line monitoring system
CN102830319B (en) A kind of zinc oxide lightning arrester insulation state measuring device with electricity and method
CN102331540B (en) On-line monitoring device and method for corona discharge of ultra-high voltage power transmission line
CN202494775U (en) Calibrator for DC system insulation device
CN103234450A (en) Online monitoring method and device for transformer winding deformation
CN103592563A (en) Direct current system insulation on-line monitoring device
CN102890259B (en) Line-failure indicator detection system
CN102866313B (en) Power tunnel cable running status comprehensive monitoring and controlling method

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