CN203241494U - Direct current system AC series current fault and insulation fault monitoring line-selection apparatus - Google Patents
Direct current system AC series current fault and insulation fault monitoring line-selection apparatus Download PDFInfo
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- CN203241494U CN203241494U CN 201320058039 CN201320058039U CN203241494U CN 203241494 U CN203241494 U CN 203241494U CN 201320058039 CN201320058039 CN 201320058039 CN 201320058039 U CN201320058039 U CN 201320058039U CN 203241494 U CN203241494 U CN 203241494U
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Abstract
The utility model relates to a direct current system AC series current fault and insulation fault monitoring line-selection apparatus, which is composed of a host computer, a monitoring device, a sampling system and current sensors. By extracting AC component effective values and further extracting ripper peak-to-peak values in a direct current system, the monitoring line-selection apparatus adopting an AC-DC component separation digital filtering technology, a DC leakage current detection technology, an RS 485 isolation communication technology and a rapid FFT transformation technology, monitors a system bus voltage to ground in a real-time manner, and alarms. The monitoring line-selection apparatus also receives each loop characteristic state information uploaded by data collectors in a real-time manner, performs intelligent analysis through a pattern-matching technology and further calculates grounding impedance which is then uploaded. Artificial intelligence pattern matching is performed on each loop characteristic state information and system built-in characteristic rules. Complete loop state information about fault loops, abnormal loops, loops with double system power supplies being backup to each other, circuits with loops and loop grounding circuits in the system is provided and further displayed on a liquid crystal screen. By means of the information, operation personnel can have a good understanding of a current state and rapidly clear faults.
Description
Technical field
The utility model relates to the straight-flow system pick-up unit, and specifically a kind of straight-flow system exchanges crosstalk and insulation fault monitoring line selection apparatus.
Background technology
Interchange crosstalk fault in the straight-flow system refers to the situation that the phase line in the alternating current directly or indirectly links to each other with the negative or positive electrode of straight-flow system.Occuring to exchange the crosstalk fault in the 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 the 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 the straight-flow system common earth fault occuring; single-point grounding can not work the mischief usually; and only when 2 earth fault occurs, just might bring the misoperation of protection or tripping to do; 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 immediately processing of crosstalk fault occurs to exchange in system.The tradition insulation monitoring and warning device all is the average voltage method to the sampling of DC voltage usually, for without in the situation that exchanges crosstalk, sample without any problem, but the direct current sampling is just forbidden after crosstalk occured to exchange.
In existing checkout equipment, there is in the straight-flow system 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 purpose of this utility model is the problem and shortage for above-mentioned existence, provide a kind of straight-flow system to exchange crosstalk and insulation fault monitoring line selection apparatus, effectively solve exchange in the 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.
The technical solution of the utility model is achieved in that
A kind of straight-flow system exchanges crosstalk and insulation fault monitoring line selection apparatus, comprise 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 installed in 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 the 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 the data acquisition unit determines that by the unique address code of data acquisition unit the automatic recognition data collector of master controller need not manually arrange; Each data acquisition unit articulates a plurality of current sensors, and after current sensor passed through special purpose interface access data collector, data acquisition unit can be identified current sensor automatically, need not manually arrange.
When straight-flow system broke down, system voltage was higher or on the low side when surpassing default 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 simultaneously alarm of voltage out-of-limit pilot lamp and hummer; Positive and negative voltage-to-ground no longer balance also surpasses when presetting setting valve, master controller liquid crystal display display alarm information, the simultaneously alarm of system earth pilot lamp and hummer.
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 loop for subsequent use, with loop and the loop ground loop of loop; perfect loop circuit state information is provided; and be shown on the liquid crystal display; help the O﹠M personnel accurately to understand the current state of straight-flow system, promptly fix a breakdown.
Further, described monitoring device inside is provided with high-pass filtering circuit, monitoring device adopts high-pass filtering circuit to extract the AC compounent effective value, the inner high-pass filtering circuit that adopts of monitoring device extracts the over the ground alternating voltage in the straight-flow system, convert alternating voltage to DC voltage by the real effective conversion chip again, give data acquisition unit.
Further, described monitoring device inside is provided with high-pass filtering circuit, monitoring device adopts the ripple peak-to-peak value in the high-pass filtering circuit extraction straight-flow system, the inner high-pass filtering circuit that adopts of monitoring device extracts the over the ground alternating voltage in the 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.
Further, described monitoring device inside is provided with high pass and low-pass filter circuit, and monitoring device adopts high pass and low-pass filter circuit that the alternating current-direct current component is separated, and DC voltage is given data acquisition unit after setovering.
Further, described monitoring device inside is provided with DA conversion module and constant current signal output module.
The utility model adopts the DC leakage current detection technique, after specifically occuring in the straight-flow system to exchange the crosstalk fault, shows as a large amount of power frequency ac voltages in the system, and crosstalk one utmost point over the ground DC voltage descends; Then produced DC leakage current by the crosstalk loop on the 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, exchange the crosstalk loop and shown obvious earth fault, exchange the crosstalk fault monitoring system and at every tested feeder line one high precision DC current sensor is housed, the DC leakage current sensor has good filtration to AC signal.
The utility model adopts 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 extracts signal frequency point by quick FFT conversion signal voltage amplitude; 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, uploads to monitoring device by the RS485 isolation, and monitoring device voltage magnitude and current amplitude calculate the insulation resistance of each monitoring circuit.
The utility model 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 simultaneously alarm 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.
The utility model 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 simultaneously alarm 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.
Each loopback diagnostic status information that the real-time receive data collector of the utility model 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 utility model has selected the real effective sample circuit to extract Alternating Component in the direct current.AC compounent in the direct current is extracted process flow diagram 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 finishing 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 the 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 all is the average electrical platen press usually, in case sealed in AC compounent in the straight-flow system, the DC voltage sampling deviation is very large, thereby cause grid grounding impedance measurement inaccurate, cause reporting by mistake or not reporting.
The accuracy of DC voltage sampling when the utility model 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 shown in Figure of description 3, when sealing in alternating current in the straight-flow system, the most AC signal of second-order filter circuit classified filtering, certain alternating voltage relatively through be behind the 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.
The route selection in the utility model crosstalk 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 and at every tested feeder line one high precision DC current sensor is housed, the DC leakage current sensor has good filtration to AC signal.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 then in the feeder line 1,
I 1=
I 2=
I L, the A place is surveyed size of current and is
I 1-
I 2=0; Among the feeder line n,
I 3=
I 4=
I L,
, the B place is surveyed size of current and is
I 5, according to system voltage size and sensor current size, can calculate and exchange the crosstalk internal resistance.
The utlity model has following function: real-time monitoring system voltage and alarm, real-time monitoring system insulation and alarm, real-time earthing loop are detected, system's loop detection is diagnosed, grading forewarning system is insulated in the loop and the ground connection historical record is 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 simultaneously alarm 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 comprises that 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 simultaneously alarm 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 loop for subsequent use, with loop and the loop ground loop of loop; perfect loop circuit state information is provided, and is shown on the 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, can reach more than the 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 among the 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 the power down.Historical record has also comprised the time on date that exchanges crosstalk, but preserves after the information such as crosstalk voltage and the power down.
The utility model straight-flow system interchange crosstalk malfunction monitoring and line selection apparatus are in real time except after the common earth fault of detection straight-flow system, the alternating voltage component in the Real-Time Monitoring straight-flow system also, in case detect the out-of-limit alarm signal of namely sending of alternating voltage, 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 utility model can effectively solve in the straight-flow system 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 the straight-flow system; Solution is exchanging the inaccurate problem of straight-flow system voltage acquisition in the crosstalk situation; Solved the problem that exchanges crosstalk and insulation fault route selection difficulty in the straight-flow system.
Below in conjunction with accompanying drawing the utility model is further described.
Description of drawings
Fig. 1 is system architecture synoptic diagram of the present utility model;
Fig. 2 is that the AC compounent in the utility model direct current is extracted process flow diagram;
Fig. 3 is the realization theory diagram that has adopted multistage filtering and voltage bias method during the direct current of the utility model interchange crosstalk fault monitoring system is sampled;
Fig. 4 is the route selection synoptic diagram in crosstalk of the present utility model loop.
Embodiment
Shown in Fig. 1-4, the utility model is that a kind of straight-flow system exchanges crosstalk and insulation fault monitoring line selection apparatus, comprise host computer, monitoring device, sampling system and current sensor, 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 installed in each feeder line and shields each transmission line circuit place (generally exit that each loop sky is opened); 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 the 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 the 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 articulates 8 current sensors, and after current sensor passed through special purpose interface access data collector, data acquisition unit can be identified current sensor automatically, need not manually arrange.
When straight-flow system broke down, system voltage was higher or on the low side when surpassing default 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 simultaneously alarm of voltage out-of-limit pilot lamp and hummer; Positive and negative voltage-to-ground no longer balance also surpasses when presetting setting valve, master controller liquid crystal display display alarm information, the simultaneously alarm of system earth pilot lamp and hummer.
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 loop for subsequent use, with loop and the loop ground loop of loop; perfect loop circuit state information is provided; and be shown on the liquid crystal display; help the O﹠M personnel accurately to understand the current state of straight-flow system, promptly fix a breakdown.
Monitoring device inside is provided with high-pass filtering circuit, monitoring device adopts high-pass filtering circuit to extract the AC compounent effective value, the inner high-pass filtering circuit that adopts of monitoring device extracts the over the ground alternating voltage in the straight-flow system, convert alternating voltage to DC voltage by the real effective conversion chip again, give data acquisition unit.
Monitoring device inside is provided with high-pass filtering circuit, monitoring device adopts the ripple peak-to-peak value in the high-pass filtering circuit extraction straight-flow system, the inner high-pass filtering circuit that adopts of monitoring device extracts the over the ground alternating voltage in the 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.
Monitoring device inside is provided with high pass and low-pass filter circuit, and monitoring device adopts high pass and low-pass filter circuit that the alternating current-direct current component is separated, and DC voltage is given data acquisition unit after setovering.
Monitoring device inside is provided with DA conversion module and constant current signal output module.
The utility model adopts the DC leakage current detection technique, after specifically occuring in the straight-flow system to exchange the crosstalk fault, shows as a large amount of power frequency ac voltages in the system, and crosstalk one utmost point over the ground DC voltage descends; Then produced DC leakage current by the crosstalk loop on the 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, exchange the crosstalk loop and shown obvious earth fault, exchange the crosstalk fault monitoring system and at every tested feeder line one high precision DC current sensor is housed, the DC leakage current sensor has good filtration to AC signal.
The utility model adopts 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 extracts signal frequency point by quick FFT conversion signal voltage amplitude; 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, uploads to monitoring device by the RS485 isolation, and monitoring device voltage magnitude and current amplitude calculate the insulation resistance of each monitoring circuit.
The utility model 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 simultaneously alarm 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.
The utility model 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 simultaneously alarm 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.
Each loopback diagnostic status information that the real-time receive data collector of the utility model 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 utility model system has following function: real-time monitoring system voltage and alarm, real-time monitoring system insulation and alarm, real-time earthing loop are detected, system's loop detection is diagnosed, grading forewarning system is insulated in the loop and the ground connection historical record is 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 simultaneously alarm 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 comprises that 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 simultaneously alarm 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 loop for subsequent use, with loop and the loop ground loop of loop; perfect loop circuit state information is provided, and is shown on the 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, can reach more than the 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 among the 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 the power down.Historical record has also comprised the time on date that exchanges crosstalk, but preserves after the information such as crosstalk voltage and the power down.
The utility model product has following architectural feature: ground connection record number is maximum preserves 1000.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 that communications status shows.Built-in double-tone buzzer warning.The output of many group YX switching values.The RS485 communication interface.
The utility model anti-interference processing method: because the DC earthing leakage current is very small signal, in order to obtain accurately test result, must resist dried anti-processing at test process.
Interference source is analyzed: interference source may from the outside, also may be that test circuit itself produces;
Outside: external interference source comprises large current interference that straight-flow system distributed capacitance, dual power supply loop produce, 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 Transient Noise at random;
The conducting AC ripple that charging circuit produces or electric wire produce the radiation crosslinking noise, might cause periodically noise.
The processing of the utility model 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 utility model the key technical indexes:
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 utility model; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection domain of the present utility model.
Claims (5)
1. a straight-flow system exchanges crosstalk and insulation fault monitoring line selection apparatus, it is characterized in that: comprise 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 installed in each feeder line and shields each transmission line circuit place; Described sampling system comprises data acquisition unit, and data acquisition unit is between master controller and current sensor; Adopt star connection or chain to connect two kinds of link models between master controller and the 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; Communication between master controller and the data acquisition unit determines the automatic recognition data collector of master controller by the unique address code of data acquisition unit; Each data acquisition unit articulates a plurality of current sensors, and after current sensor passed through special purpose interface access data collector, data acquisition unit can be identified current sensor automatically;
When straight-flow system broke down, system voltage was higher or on the low side when surpassing default 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 simultaneously alarm of voltage out-of-limit pilot lamp and hummer; Positive and negative voltage-to-ground no longer balance also surpasses when presetting setting valve, master controller liquid crystal display display alarm information, the simultaneously alarm of system earth pilot lamp and hummer.
2. device according to claim 1, it is characterized in that: monitoring device inside is provided with high-pass filtering circuit, monitoring device adopts high-pass filtering circuit to extract the AC compounent effective value, the inner high-pass filtering circuit that adopts of monitoring device extracts the over the ground alternating voltage in the straight-flow system, convert alternating voltage to DC voltage by the real effective conversion chip again, give data acquisition unit.
3. device according to claim 1 and 2, it is characterized in that: monitoring device inside is provided with high-pass filtering circuit, monitoring device adopts the ripple peak-to-peak value in the high-pass filtering circuit extraction straight-flow system, the inner high-pass filtering circuit that adopts of monitoring device extracts the over the ground alternating voltage in the 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.
4. device according to claim 3, it is characterized in that: monitoring device inside is provided with high pass and low-pass filter circuit, and monitoring device adopts high pass and low-pass filter circuit that the alternating current-direct current component is separated, and DC voltage is given data acquisition unit after through biasing.
5. device according to claim 4, it is characterized in that: monitoring device inside is provided with DA conversion module and constant current signal output module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320058039 CN203241494U (en) | 2013-02-01 | 2013-02-01 | Direct current system AC series current fault and insulation fault monitoring line-selection apparatus |
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|---|---|---|---|
| CN 201320058039 CN203241494U (en) | 2013-02-01 | 2013-02-01 | Direct current system AC series current fault and insulation fault monitoring line-selection apparatus |
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| CN 201320058039 Expired - Fee Related CN203241494U (en) | 2013-02-01 | 2013-02-01 | Direct current system AC series current fault and insulation fault monitoring line-selection apparatus |
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| CN (1) | CN203241494U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090245A (en) * | 2014-04-03 | 2014-10-08 | 大连科海测控技术有限公司 | Alternating current infiltrating detector for direct current supply system |
| CN104391256A (en) * | 2014-12-03 | 2015-03-04 | 浙江科畅电子有限公司 | Direct-current power supply looped network fault diagnosis device |
| CN105699927A (en) * | 2016-03-16 | 2016-06-22 | 国家电网公司 | DC system insulation monitor calibration device |
| 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 |
| CN108152708A (en) * | 2017-12-20 | 2018-06-12 | 广州勤正电力科技有限公司 | Multi-parameters test device in DC circuit system |
| CN110596529A (en) * | 2019-08-30 | 2019-12-20 | 深圳供电局有限公司 | Flexible direct current power grid ground insulation fault detection device and system |
| CN110632452A (en) * | 2019-08-30 | 2019-12-31 | 深圳供电局有限公司 | Flexible direct-current power grid ground insulation fault detection method and computer equipment |
| CN110646704A (en) * | 2019-08-30 | 2020-01-03 | 深圳供电局有限公司 | Flexible direct-current power grid ground insulation fault detection method and computer equipment |
| CN110794259A (en) * | 2019-10-31 | 2020-02-14 | 南方电网科学研究院有限责任公司 | Alternating current-direct current line-touching fault line selection method and device and computer readable storage medium |
| CN111025093A (en) * | 2019-11-19 | 2020-04-17 | 云南电网有限责任公司临沧供电局 | XLPE cable insulation life estimation method based on double-end balance factor |
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2013
- 2013-02-01 CN CN 201320058039 patent/CN203241494U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090245A (en) * | 2014-04-03 | 2014-10-08 | 大连科海测控技术有限公司 | Alternating current infiltrating detector for direct current supply system |
| CN104090245B (en) * | 2014-04-03 | 2017-03-29 | 大连科海测控技术有限公司 | The detection means that a kind of DC power-supply system alternating current is mixed into |
| CN104391256A (en) * | 2014-12-03 | 2015-03-04 | 浙江科畅电子有限公司 | Direct-current power supply looped network fault diagnosis device |
| CN105699927A (en) * | 2016-03-16 | 2016-06-22 | 国家电网公司 | DC system insulation monitor calibration device |
| 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 |
| CN108152708A (en) * | 2017-12-20 | 2018-06-12 | 广州勤正电力科技有限公司 | Multi-parameters test device in DC circuit system |
| CN110596529A (en) * | 2019-08-30 | 2019-12-20 | 深圳供电局有限公司 | Flexible direct current power grid ground insulation fault detection device and system |
| CN110632452A (en) * | 2019-08-30 | 2019-12-31 | 深圳供电局有限公司 | Flexible direct-current power grid ground insulation fault detection method and computer equipment |
| CN110646704A (en) * | 2019-08-30 | 2020-01-03 | 深圳供电局有限公司 | Flexible direct-current power grid ground insulation fault detection method and computer equipment |
| CN110794259A (en) * | 2019-10-31 | 2020-02-14 | 南方电网科学研究院有限责任公司 | Alternating current-direct current line-touching fault line selection method and device and computer readable storage medium |
| CN110794259B (en) * | 2019-10-31 | 2021-11-19 | 南方电网科学研究院有限责任公司 | Alternating current-direct current line-touching fault line selection method and device and computer readable storage medium |
| CN111025093A (en) * | 2019-11-19 | 2020-04-17 | 云南电网有限责任公司临沧供电局 | XLPE cable insulation life estimation method based on double-end balance factor |
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