CN103135038B - Straight-flow system exchanges crosstalk and insulation fault monitoring selection method - Google Patents

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

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CN103135038B
CN103135038B CN201310040223.6A CN201310040223A CN103135038B CN 103135038 B CN103135038 B CN 103135038B CN 201310040223 A CN201310040223 A CN 201310040223A CN 103135038 B CN103135038 B CN 103135038B
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loop
voltage
monitoring
straight
flow
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CN201310040223.6A
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CN103135038A (en
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赵应龙
王伟
曾建斌
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广州优维电子科技有限公司
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Abstract

The present invention relates to straight-flow system and exchange crosstalk and insulation fault monitoring selection method, comprise host computer, monitoring device, sampling system and current sensor, by extracting AC compounent effective value, extract the ripple peak-to-peak value in straight-flow system, alternating current-direct current component is adopted to be separated digital filtering technique, direct current detection technology, RS485 isolated communication technology and quick FFT converter technique, real-time monitoring system bus combined-voltage over the ground, ripple voltage peak-to-peak value also can alarm, each loop current information that real-time reception data acquisition unit is uploaded, and carry out intellectual analysis by mode-matching technique, calculate impedance ground, the feature status information in every bar loop and the built-in characterization rules of system are carried out artificial intelligence pattern's coupling, to the interchange crosstalk fault that system exists, ripple peak-to-peak value Monitoring Data, earth fault and insulation fault loop state information, loop information etc. are shown on liquid crystal display, operation maintenance personnel is helped accurately to understand current state, fix a breakdown rapidly.

Description

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

Technical field

The present invention relates to 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 is directly or indirectly connected with the negative or positive electrode of straight-flow system.Occur to exchange crosstalk fault in straight-flow system usually to be caused by following two kinds of reasons: 1, the maloperation of maintainer; 2, the equipment containing Alternating Current Power Supply in straight-flow system breaks down and causes exchanging crosstalk.Straight-flow system exchanges crosstalk fault and is different from common earth fault; when there is common earth fault in straight-flow system; single-point grounding can not work the mischief usually; and misoperation or the refused action of protection is only just likely brought when there is two points ground fault fault; therefore, after generation one-point grounding fault, maintainer also has the sufficient time to process.And straight-flow system exchanges crosstalk fault once there is the misoperation namely likely causing protection, and the probability that this harm occurs will be far longer than common earth fault, and therefore system needs instant process once occur to exchange crosstalk fault.Conventional insulator monitoring device is all average voltage method to the sampling of DC voltage usually, for without when exchanging crosstalk, samples without any problem, but after occurring to exchange crosstalk, direct current sampling is just inaccurate.

In existing checkout equipment, there is in straight-flow system the problem exchanging crosstalk loop and accurately cannot locate, exchange crosstalk and insulation fault route selection difficulty exchanging that straight-flow system voltage acquisition in crosstalk situation is forbidden, in straight-flow system.

Summary of the invention

The object of the invention is to for above-mentioned Problems existing and deficiency, there is provided a kind of straight-flow system to exchange crosstalk and insulation fault monitoring selection method, effectively solve in straight-flow system exchange crosstalk can not Timeliness coverage and process, exchange the problem accurately cannot located, exchange crosstalk and insulation fault route selection difficulty exchanging that straight-flow system voltage acquisition in crosstalk situation is forbidden, in straight-flow system in crosstalk loop in straight-flow system.

Technical scheme of the present invention is achieved in that

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

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 that DA output module, data memory module, LCD display module, input through keyboard module, monitor message display and configuration information input; Direct current transducer is arranged on each liquid crystal display each transmission line circuit place (generally in the exit that each loop is insured); Described sampling system comprises data acquisition unit, and data acquisition unit, between master controller and direct current transducer, selects installation site as required; Star connection or chain is adopted to connect two kinds of link models between master controller and data acquisition unit, each data acquisition unit both directly can be connected by RS485 bus with master controller, also indirectly can be connected by the cascade port of another data acquisition unit and master controller, 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 has nothing to do, and brings the dirigibility of height to fielded system configuration; Master controller and data acquisition unit can charged hot plugs, and master controller can identification data collector automatically, need not manually arrange; Each data acquisition unit can mount multiple (8) direct current transducer, and when direct current transducer is by after special purpose interface access data collector, data acquisition unit can identify direct current transducer automatically, need not manually arrange;

Extract AC compounent effective value, monitoring device inside adopts high-pass filtering circuit to be extracted by the alternating voltage over the ground in straight-flow system, then converts alternating voltage to DC voltage by RMS conversion chip, gives processor sampling system;

Extract the ripple peak-to-peak value in straight-flow system, monitoring device inside adopts high-pass filtering circuit to be extracted by the alternating voltage over the ground in straight-flow system, extract AC ripple peak-to-peak value through independently high speed sampling circuit, give processor analysis, the band of high speed sampling circuit is wider than 20MHz;

Adopt alternating current-direct current component to be separated digital filtering technique, specifically adopt high pass and low-pass filter circuit to be separated by alternating current-direct current component in monitoring device inside, DC voltage gives processor sampling system after biased;

Adopt DC leakage current detection technique, after specifically occurring to exchange crosstalk fault in straight-flow system, system shows as a large amount of power frequency ac voltages, crosstalk one pole over the ground DC voltage declines; Feeder line then creates DC leakage current by crosstalk loop, by can realize the route selection function exchanging crosstalk loop to the Real-Time Monitoring of this leakage current; The route selection in crosstalk loop, after straight-flow system occurs to exchange crosstalk fault, exchange crosstalk loop and show obvious earth fault, exchange crosstalk fault monitoring system, on the tested feeder line of every bar, a High-accuracy direct current current sensor is housed, DC current sensor has good filtration to AC signal;

Adopt RS485 isolated communication technology and quick FFT converter technique, in the 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 are optional, waveform is sinusoidal wave, and monitoring device gathers voltage-to-ground extracts signal frequency point signal voltage amplitude by quick FFT conversion; Data acquisition unit extracts the marking current amplitude of signal frequency point after carrying out FFT conversion to the leakage current of each feeder line, upload to monitoring device by RS485 isolation, monitoring device voltage magnitude and current amplitude calculate the insulation resistance of each monitoring circuit;

Master controller real-time monitoring system Bus Voltage, comprise system voltage, positive voltage-to-ground, negative voltage-to-ground and the also display in real time of interchange crosstalk voltage, when straight-flow system breaks down, system voltage is higher or on the low side when exceeding default setting valve, or alternating voltage master controller liquid crystal display display alarm information when exceeding default setting valve, voltage out-of-limit pilot lamp and hummer alarm simultaneously, warning information also uploads to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface;

Master controller real-time monitoring system bus earth impedance, comprise positive resistance to earth, negative resistance to earth also shows in real time, when straight-flow system breaks down, when positive and negative voltage-to-ground no longer balances and exceedes default setting valve, master controller liquid crystal display display alarm information, system earth pilot lamp and hummer alarm simultaneously, warning information also uploads to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface;

Each loopback diagnostic status information that master controller real-time reception data acquisition unit is uploaded, and carry out intellectual analysis by mode-matching technique, distinguish different ground states, removal system charging pulse disturbs, the impact that the interference of fluctuating level and loop bring, finally accurately judges ground loop, and calculates impedance ground, impedance ground numerical value shows at liquid crystal display, and uploads to complex automatic system or dispatch automated system host computer by RS485 interface;

Master controller is by carrying out artificial intelligence pattern's coupling by the feature status information in every bar loop and the built-in characterization rules of system; the loop of the fault loop existed system, improper loop, system dual power supply loop for subsequent use each other, band loop and loop ground loop; perfect loop circuit state information is provided; and be shown on liquid crystal display; effective help operation maintenance personnel accurately understands the current state of straight-flow system, promptly fixes a breakdown.

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

Further, the present invention have employed the accuracy of DC voltage sampling when multistage filtering and voltage bias method ensure to exchange crosstalk in the direct current sampling exchanging crosstalk fault monitoring system.Realize theory diagram 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, the alternating voltage necessarily compared be after DC bias circuit on the occasion of, the AC signal of symmetry is filtered by sampling system after long-time average, finally deducts inclined threshold voltage and restores real DC voltage accurately.

Further, the route selection in crosstalk loop of the present invention, after straight-flow system occurs to exchange crosstalk fault, exchanges crosstalk loop and shows obvious earth fault.Exchange crosstalk fault monitoring system, on the tested feeder line of every bar, a High-accuracy direct current current sensor is housed, DC leakage flow 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 for existing, and Rx is crosstalk internal resistance, and R is system balancing electric bridge.If load current size is I l, the positive voltage-to-ground of system is Vcc, and negative voltage-to-ground is Vss, then in feeder line 1, and I 1=I 2=I l, A place to survey size of current be I 1-I 2=0; In feeder line n, I 3=I 4=I l, , B place to survey size of current be I 5, according to system voltage size and sensor current size, can calculate and exchange crosstalk internal resistance.

Present system has following function: real-time monitoring system voltage alarm, real-time monitoring system insulation alarm, detections of real-time earthing loop, system loop checkout and diagnosis, loop insulation grading forewarning system and the analysis of ground connection historical record.

Voltage monitoring: master controller (main frame) real-time monitoring system Bus Voltage, comprises system voltage, positive voltage-to-ground, negative voltage-to-ground and the also display in real time of interchange crosstalk voltage.When straight-flow system breaks down, system voltage is higher or on the low side when exceeding default setting valve, or the display alarm of main frame liquid crystal display information, voltage out-of-limit pilot lamp and hummer alarm simultaneously when alternating voltage exceedes default setting valve.Warning information also uploads 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, comprises positive resistance to earth, negative resistance to earth also shows in real time.When straight-flow system breaks down, when positive and negative voltage-to-ground no longer balances and exceedes default setting valve, master controller (main frame) liquid crystal display display alarm information, system earth pilot lamp and hummer alarm simultaneously.Warning information also uploads to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface.

Earthing detection: each loopback diagnostic status information that master controller (main frame) real-time reception data acquisition unit (handset) is uploaded, and carry out intellectual analysis by mode-matching technique, distinguish different ground states, removal system charging pulse disturbs, the impact that the interference of fluctuating level and loop bring, finally accurately judge ground loop, and calculate impedance ground.Impedance ground numerical value shows at liquid crystal display, and uploads to complex automatic system or dispatch automated system host computer by RS485 interface.

Loop diagnostic: electric power DC loop circuit is ubiquitous, and bring great interference to the location of earth fault.Master controller (main frame) is by carrying out artificial intelligence pattern's coupling by the feature status information in every bar loop and the built-in characterization rules of system; introduce the concept of loop index first; the loop of the fault loop existed system, improper loop, system dual power supply loop for subsequent use each other, band loop and loop ground loop; perfect loop circuit state information is provided, and is shown on liquid crystal display.Operation maintenance personnel effectively can be helped 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, can reach more than 500K, the earth impedance therefore by detecting unearthed loop judges the trend of its secular variation, provides the early warning information of loop ground connection.The diagnosis that insulation reduction early warning and the monitoring of loop coupling are system provides effective means.

Historical record: system earth record will be kept in EEPROM automatically for consulting.This record includes the date-time of ground connection, impedance ground, and the information such as ground loop also can be preserved after power down.Historical record further comprises the date-time exchanging crosstalk, and the information such as crosstalk voltage also can be preserved after power down.

Straight-flow system interchange crosstalk malfunction monitoring of the present invention and line selection apparatus are in real time except after the common earth fault of detection straight-flow system, alternating current voltage component also in Real-Time Monitoring straight-flow system, once detect that alternating voltage is out-of-limit namely send alarm signal, and the route selection function realized exchanging crosstalk loop, help maintainer's quick solution fault, substantially increase the security and stability of straight-flow system.

The present invention can effectively solve in straight-flow system exchange crosstalk can not Timeliness coverage and process problem, solve in straight-flow system and exchange the problem cannot accurately located in crosstalk loop; Solve and exchanging the problem that in crosstalk situation, straight-flow system voltage acquisition is inaccurate; Solve in straight-flow system the problem exchanging crosstalk and insulation fault route selection difficulty.

Below in conjunction with accompanying drawing, the present invention is further illustrated.

Accompanying drawing explanation

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 extracts process flow diagram;

Fig. 3 be the present invention exchange in the direct current sampling of crosstalk fault monitoring system have employed multistage filtering and voltage bias method realize theory diagram;

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

Embodiment

As Figure 1-4, the present invention is that a kind of straight-flow system exchanges crosstalk and insulation fault monitoring selection method, comprising:

Host computer, monitoring device, sampling system and direct current transducer, monitoring device comprises master controller, and 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 of monitor message display and configuration information input; Direct current transducer is arranged on each feeder line screen each transmission line circuit place (generally in the exit that each loop sky is opened); Sampling system comprises data acquisition unit, and data acquisition unit, between master controller and direct current transducer, selects installation site as required; Star connection or chain is adopted to connect two kinds of link models between master controller and data acquisition unit, each data acquisition unit both directly can be connected by RS485 bus with master controller, also indirectly can be connected by the cascade port of another data acquisition unit and master controller, 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 has nothing to do, and brings the dirigibility of height to fielded system configuration; Master controller and data acquisition unit can charged hot plugs, and master controller can identification data collector automatically, need not manually arrange; Each data acquisition unit can mount 8 direct current transducers, and when direct current transducer is by after special purpose interface access data collector, data acquisition unit can identify direct current transducer automatically, need not manually arrange;

Extract the AC compounent effective value in straight-flow system, monitoring device inside adopts high-pass filtering circuit to be extracted by the alternating voltage over the ground in straight-flow system, convert alternating voltage to DC voltage by RMS conversion chip again, give processor sampling system;

Extract the AC compounent ripple peak-to-peak value in straight-flow system, monitoring device inside adopts high-pass filtering circuit to be extracted by the alternating voltage over the ground in straight-flow system, then by independently high-speed sampling module by the ripple peak-to-peak value in straight-flow system out;

Adopt alternating current-direct current component to be separated digital filtering technique, specifically adopt high pass and low-pass filter circuit to be separated by alternating current-direct current component in monitoring device inside, DC voltage gives processor sampling system after biased;

Adopt DC leakage current detection technique, after specifically occurring to exchange crosstalk fault in straight-flow system, system shows as a large amount of power frequency ac voltages, crosstalk one pole over the ground DC voltage declines; Feeder line then creates DC leakage current by crosstalk loop, by can realize the route selection function exchanging crosstalk loop to the Real-Time Monitoring of this leakage current; The route selection in crosstalk loop, after straight-flow system occurs to exchange crosstalk fault, exchange crosstalk loop and show obvious earth fault, exchange crosstalk fault monitoring system, on the tested feeder line of every bar, a High-accuracy direct current current sensor is housed, DC current sensor has good filtration to AC signal;

Adopt RS485 isolated communication technology and quick FFT converter technique, in the 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 are optional, waveform is sinusoidal wave, and monitoring device gathers voltage-to-ground extracts signal frequency point signal voltage amplitude by quick FFT conversion; Data acquisition unit extracts the marking current amplitude of signal frequency point after carrying out FFT conversion to the leakage current of each feeder line, upload to monitoring device by RS485 isolation, monitoring device voltage magnitude and current amplitude calculate the insulation resistance of each monitoring circuit;

Master controller real-time monitoring system Bus Voltage, comprise system voltage, positive voltage-to-ground, negative voltage-to-ground and the also display in real time of interchange crosstalk voltage, when straight-flow system breaks down, system voltage is higher or on the low side when exceeding default setting valve, or alternating voltage master controller liquid crystal display display alarm information when exceeding default setting valve, voltage out-of-limit pilot lamp and hummer alarm simultaneously, warning information also uploads to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface;

Master controller real-time monitoring system bus earth impedance, comprise positive resistance to earth, negative resistance to earth also shows in real time, when straight-flow system breaks down, when positive and negative voltage-to-ground no longer balances and exceedes default setting valve, master controller liquid crystal display display alarm information, system earth pilot lamp and hummer alarm simultaneously, warning information also uploads to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface;

Each loopback diagnostic status information that master controller real-time reception data acquisition unit is uploaded, and carry out intellectual analysis by mode-matching technique, distinguish different ground states, removal system charging pulse disturbs, the impact that the interference of fluctuating level and loop bring, finally accurately judges ground loop, and calculates impedance ground, impedance ground numerical value shows at liquid crystal display, and uploads to complex automatic system or dispatch automated system host computer by RS485 interface;

Master controller is by carrying out artificial intelligence pattern's coupling by the feature status information in every bar loop and the built-in characterization rules of system; the loop of the fault loop existed system, improper loop, system dual power supply loop for subsequent use each other, band loop and loop ground loop; perfect loop circuit state information is provided; and be shown on liquid crystal display; effective help operation maintenance personnel accurately understands the current state of straight-flow system, promptly fixes a breakdown.

Present system has following function: real-time monitoring system voltage alarm, real-time monitoring system insulation alarm, detections of real-time earthing loop, system loop checkout and diagnosis, loop insulation grading forewarning system and the analysis of ground connection historical record.

Voltage monitoring: master controller real-time monitoring system Bus Voltage, comprises system voltage, positive voltage-to-ground, negative voltage-to-ground and the also display in real time of interchange crosstalk voltage.When straight-flow system breaks down, system voltage is higher or on the low side when exceeding default setting valve, or the display alarm of main frame liquid crystal display information, voltage out-of-limit pilot lamp and hummer alarm simultaneously when alternating voltage exceedes default setting valve.Warning information also uploads 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, comprises positive resistance to earth, negative resistance to earth also shows in real time.When straight-flow system breaks down, when positive and negative voltage-to-ground no longer balances and exceedes default setting valve, master controller liquid crystal display display alarm information, system earth pilot lamp and hummer alarm simultaneously.Warning information also uploads to complex automatic system or dispatch automated system host computer by YX switching value and RS485 interface.

Earthing detection: each loopback diagnostic status information that master controller real-time reception data acquisition unit is uploaded, and carry out intellectual analysis by mode-matching technique, distinguish different ground states, removal system charging pulse disturbs, the impact that the interference of fluctuating level and loop bring, finally accurately judge ground loop, and calculate impedance ground.Impedance ground numerical value shows at liquid crystal display, and uploads to complex automatic system or dispatch automated system host computer by RS485 interface.

Loop diagnostic: electric power DC loop circuit is ubiquitous, and bring great interference to the location of earth fault.Master controller is by carrying out artificial intelligence pattern's coupling by the feature status information in every bar loop and the built-in characterization rules of system; introduce the concept of loop index first; the loop of the fault loop existed system, improper loop, system dual power supply loop for subsequent use each other, band loop and loop ground loop; perfect loop circuit state information is provided, and is shown on liquid crystal display.Operation maintenance personnel effectively can be helped 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, can reach more than 500K, the earth impedance therefore by detecting unearthed loop judges the trend of its secular variation, provides the early warning information of loop ground connection.The diagnosis that insulation reduction early warning and the monitoring of loop coupling are system provides effective means.

Historical record: system earth record will be kept in EEPROM automatically for consulting.This record includes the date-time of ground connection, impedance ground, and the information such as ground loop also can be preserved after power down.Historical record further comprises the date-time exchanging crosstalk, and the information such as crosstalk voltage also can be preserved after power down.

Product of the present invention has following architectural feature: the maximum preservation of ground connection record number 1000.IO interface.Formula of cruising man-machine interface, brick pattern menu, operation is succinct, powerful.Many groups LED information display system state shows, and communications status shows.Built-in double-tone buzzer warning.Many groups YX output switch parameter.RS485 communication interface.

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

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

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

Inner: sensor zero point drift, the linearity.

The form of expression of interference: interference may occur in different forms, in dynamic load in thread environment or radio frequency once in a while (RF) interference, likely produces random Transient Noise;

Charging circuit produce conducting AC ripple or electric wire produce radiation crosslinking noise, likely cause periodic noises.

The present invention is to the process of interference:

A. adopt the hardware design of double-deck anti-distributed capacitance interference and utilize the Software for Design of anti-communication noise theory, the impact of the interference of straight-flow system distributed capacitance, the interference of electromagnetic pulse and other noise can be eliminated;

B. system analyser internal sample circuit all adopts high precision to isolate operational amplifier, to reduce the interference of straight-flow system to master controller;

C. adopt 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 improving signal to noise ratio (S/N ratio) on the other hand;

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

The key technical indexes of the present invention:

Ground insulation resistance value scope can be monitored: impedance ground: 0-50K; Insulation reduces: 51-500K.

Can monitoring voltage scope:

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

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

System total voltage: 0-300V;

Exchange crosstalk voltage: 0-300V;

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

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

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

Level.

DC loop number can be monitored: 500 tunnels.

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

Voltage monitoring error is less than 0.2%.

Insulation against ground alarm, band YX output contact.

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

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

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

Operating ambient temperature :-30 DEG C-+50 DEG C.

Relative humidity :≤96%.

Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (1)

1. straight-flow system exchanges a malfunction monitoring selection method for crosstalk and insulation fault monitoring line selection apparatus, it is characterized in that:
Device comprises 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 that DA output module, data memory module, LCD display module, input through keyboard module, monitor message display and configuration information input; Current sensor is arranged on each transmission line circuit place of each feeder line screen; Described sampling system comprises data acquisition unit, and data acquisition unit, between master controller and current sensor, selects installation site as required; Star connection or chain is adopted to connect two kinds of link models between master controller and data acquisition unit, each data acquisition unit and master controller are directly connected by RS485 bus, or be indirectly connected by the cascade port of another data acquisition unit and master controller, 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 automatic identification data collector of master controller, need not manually be arranged; Each data acquisition unit mounts multiple current sensor, and when current sensor is by after special purpose interface access data collector, data acquisition unit can identify current sensor automatically, need not manually arrange;
Method comprises:
Extract AC compounent effective value, monitoring device inside adopts high-pass filtering circuit to be extracted by the alternating voltage over the ground in straight-flow system, then converts alternating voltage to DC voltage by RMS conversion chip, gives processor sampling system;
Extract the ripple peak-to-peak value in straight-flow system, monitoring device inside adopts high-pass filtering circuit to be extracted by the alternating voltage over the ground in straight-flow system, extract AC ripple peak-to-peak value through independently high speed sampling circuit, give processor analysis, the band of high speed sampling circuit is wider than 20MHz;
Adopt alternating current-direct current component to be separated digital filtering technique, specifically adopt high pass and low-pass filter circuit to be separated by alternating current-direct current component in monitoring device inside, DC voltage gives processor sampling system after biased;
Adopt DC leakage current detection technique, after specifically occurring to exchange crosstalk fault in straight-flow system, system shows as a large amount of power frequency ac voltages, crosstalk one pole over the ground DC voltage declines; Feeder line then creates DC leakage current by crosstalk loop, by can realize the route selection function exchanging crosstalk loop to the Real-Time Monitoring of this leakage current;
The route selection in crosstalk loop, after straight-flow system occurs to exchange crosstalk fault, exchange crosstalk loop and show obvious earth fault, exchange crosstalk fault monitoring system, on the tested feeder line of every bar, a High-accuracy direct current current sensor is housed, DC current sensor has good filtration to AC signal;
Adopt RS485 isolated communication technology and quick FFT converter technique, in the 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, is extracted the signal voltage amplitude of signal frequency point by quick FFT conversion; Data acquisition unit extracts the marking current amplitude of signal frequency point after carrying out FFT conversion to the leakage current of each feeder line, upload to monitoring device by RS485 isolation, monitoring device utilizes voltage magnitude and current amplitude to calculate the insulation resistance of each monitoring circuit;
Master controller real-time monitoring system Bus Voltage, comprise system voltage, positive voltage-to-ground, negative voltage-to-ground, exchange crosstalk voltage and ripple peak-to-peak value voltage, and show in real time, when straight-flow system breaks down, system voltage is higher or on the low side when exceeding default setting valve, or when alternating voltage or ripple peak-to-peak value voltage exceed default setting valve, master controller liquid crystal display display alarm information, voltage out-of-limit pilot lamp and hummer alarm simultaneously, warning information also uploads to complex automatic system or dispatch automated system host computer by switching value and RS485 interface,
Master controller real-time monitoring system bus earth impedance, comprise positive resistance to earth, negative resistance to earth, and show in real time, when straight-flow system breaks down, when positive and negative voltage-to-ground no longer balances and exceedes default setting valve, master controller liquid crystal display display alarm information, system earth pilot lamp and hummer alarm simultaneously, warning information also uploads to complex automatic system or dispatch automated system host computer by switching value and RS485 interface;
Each loopback diagnostic status information that master controller real-time reception data acquisition unit is uploaded, and carry out intellectual analysis by mode-matching technique, distinguish different ground states, removal system charging pulse disturbs, the impact that the interference of fluctuating level and loop bring, finally accurately judges ground loop, and calculates impedance ground, impedance ground numerical value shows at liquid crystal display, and uploads to complex automatic system or dispatch automated system host computer by RS485 interface;
Master controller is by carrying out artificial intelligence pattern's coupling by the feature status information in every bar loop and the built-in characterization rules of system; the loop of the fault loop existed system, improper loop, system dual power supply loop for subsequent use each other, band loop and loop ground loop; perfect loop circuit state information is provided; and be shown on liquid crystal display; effective help operation maintenance personnel accurately understands the current state of straight-flow system, promptly fixes a breakdown.
CN201310040223.6A 2013-02-01 2013-02-01 Straight-flow system exchanges crosstalk and insulation fault monitoring selection method CN103135038B (en)

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Families Citing this family (15)

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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
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
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
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
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
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
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
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

Family Cites Families (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

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