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 PDFInfo
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Abstract
Description
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.
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| 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 |
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| 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 |
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