CN105938167B - Direct current system exchange scurries into localization of fault and searches device and method - Google Patents
Direct current system exchange scurries into localization of fault and searches device and method Download PDFInfo
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- CN105938167B CN105938167B CN201610425169.0A CN201610425169A CN105938167B CN 105938167 B CN105938167 B CN 105938167B CN 201610425169 A CN201610425169 A CN 201610425169A CN 105938167 B CN105938167 B CN 105938167B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The present invention is to provide a kind of method that can quickly search exchange and scurry into DC system fault point physical location, includes monitoring host, Portable Orientation Instrument and forcipated mutual-inductor.Monitoring host is used to measure the of ac UL scurried into, DC voltage Ud, positive voltage-to-ground U+, cathode voltage-to-ground U-, intelligent decision exchange scurries into polarity, mode and calculates equivalent resistance resistance value R, and scurries into exchange and extremely inject a ultra-low frequency signal electric current Id to the earth.Alternating current source is equivalent to resistance eutral grounding, the lookup that resistance eutral grounding point is regarded in lookup a little as is scurried into exchange, it is exchanged with Portable Orientation Instrument along the flow direction lookup of signal code Id with forcipated mutual-inductor and scurries into fault point, finding the position that signal code Id suddenly disappears is exactly the position of failure point that exchange is scurried into.
Description
Technical field
Localization of fault is scurried into the present invention relates to a kind of exchange of direct current system and searches device and method, belongs to direct current system prison
Survey field.
Background technique
According to " 25 important requirements for preventing power generation accident " (National Energy Board's safety [2014] 161)
" the 22.2.3.22 articles: preventing that DC Line Fault appearance is scurried into exchange." " the 22.2.3.23.3 articles: newly-built or transformation electric substation,
DC power system insulation monitoring device should have survey note and warning function that DC Line Fault is altered in exchange.Original DC power supply
System insulation monitoring device should be gradually transformed, it is made to have survey note and warning function that DC Line Fault is altered in exchange." regulation,
Have producer currently on the market and produce the survey note alarm device for scurrying into direct current system about exchange, also there are Patents documents.
It is this kind of but due to exchanging the complexity scurried into direct current system and there is intermittent, concealment and direct current system circuit
Monitoring device and patent document are all unable to positioning searching and exchange the fault point scurried into, that is to say, that when direct current system is scurried into exchange
This kind of device and patent document have been only able to detect exchange and have scurried into, and cannot judge that exchange is scurried into from which branch, can not
The specific physical location scurried into of exchange is searched and located, cannot accomplish that DC Line Fault is scurried into elimination exchange promptly and accurately, to factory/stand
Safety in production bury hidden trouble.
Divide from mode is scurried into, exchange, which is scurried into direct current system and can be divided into, directly scurries into and scurry into through transition resistance, due to friendship
The pole N of galvanic electricity is ground connection, so alternating current source UL can be regarded as one 0K resistance eutral grounding by directly scurrying into mode, through transition electricity
Mode is scurried into resistance can regard alternating current source UL as that one resistance value is the resistance eutral grounding of R.Exchange is divided to scurry into from polarity is scurried into
Direct current system can be divided into from direct-flow positive pole scurry into, scurried into from direct current cathode, from direct current positive and negative electrodes in same when scurry into.
FIG. 1 to FIG. 6 is the schematic diagram that direct current system is scurried into exchange, wherein Fig. 1 is directly to scurry into show over the ground from direct-flow positive pole
It is intended to, is presented as that alternating current source UL is directly superimposed upon direct-flow positive pole to big ground；Fig. 2 is directly to scurry into signal over the ground from direct current cathode
Figure, is presented as that alternating current source UL is directly superimposed upon direct current cathode to big ground；To greatly altering when Fig. 3 is directly from direct current positive and negative electrodes in same
Enter schematic diagram, be presented as alternating current source UL directly while being superimposed upon direct current cathode to the earth and anode to big ground；Fig. 4 is alternating current source
UL through transition resistance from direct-flow positive pole to schematic diagram is greatly scurried into, be presented as that alternating current source UL is superimposed upon direct current through a transition resistance
Anode is to big ground；Fig. 5 be alternating current source UL through transition resistance from direct current cathode to schematic diagram is greatly scurried into, be presented as alternating current source UL
Direct current cathode is superimposed upon to big ground through a transition resistance；When Fig. 6 is alternating current source UL through transition resistance from direct current positive and negative electrodes in same
To schematic diagram is greatly scurried into, it is right to the earth and anode to be presented as that alternating current source UL is superimposed upon direct current cathode through a transition resistance respectively
Big ground.
Direct current system is scurried into exchange will seriously affect the safe operation of system, and the especially exchange N is extremely directly scurried into
Or scurry into and scurried into simultaneously from direct current is positive and negative through transition resistance from direct current is positive and negative simultaneously through arc suppression coil, easily cause direct current positive and negative
Very big hidden danger is buried to the safe operation of direct current system in extremely short road, so when direct current system any point occurs to exchange and scurry into, it must
Failure timely must be accurately eliminated, scurried into avoid generation second point exchange and causes direct current positive and negative anodes short-circuit.
Summary of the invention
It is an object of the present invention to provide a kind of sides that can quickly search exchange and scurry into DC system fault point physical location
Method quickly can accurately search and locate the specific physical bit that exchange is scurried into when exchange, which occurs, for direct current system any point scurries into
It sets, eliminates failure, avoid generation second point exchange from scurrying into and cause direct current positive and negative anodes short-circuit, guarantee direct current system safe operation.
The method of the present invention includes monitoring host, Portable Orientation Instrument and forcipated mutual-inductor, and monitoring host is used to measure to scurry into
Alternating voltage UL, direct current system busbar voltage Ud, direct-flow positive pole voltage-to-ground U+, direct current cathode voltage-to-ground U- and send out ultralow
Frequency current signal Id, Portable Orientation Instrument are used to search and locate the specific physical location that exchange is scurried into, and forcipated mutual-inductor is used to feel
The ultralow frequency current signal of host sending should be monitored.When there is exchange to scurry into direct current, monitoring host measures the of ac scurried into
Value UL, the value Ud of DC voltage, positive voltage-to-ground value U+, cathode voltage-to-ground value U-, intelligent decision exchange scurry into polarity,
Mode and equivalent resistance resistance value R is calculated, and scurries into the ultra-low frequency signal electricity for extremely injecting a 0.125Hz to the earth to exchange
Id is flowed, according to the mode that exchange is scurried into, alternating current source is equivalent to resistance eutral grounding, and resistance eutral grounding can both be regarded as by exchanging the lookup scurried into a little
Point lookup, forcipated mutual-inductor access Portable Orientation Instrument, Portable Orientation Instrument and monitoring host by infrared signal emit and
It receives and realizes that signal is synchronous, exchanged with Portable Orientation Instrument along the flow direction lookup of signal code Id with forcipated mutual-inductor and scurry into event
Hinder point, finding the position that signal code Id suddenly disappears is exactly the position of failure point that exchange is scurried into.
The monitoring host include voltage acquisition circuit, Signal Generator of Ultra-low Frequency, cpu controller 1, infrared transmitter,
Display 1, alarm device, voltage acquisition circuit pass through acquisition alternating voltage amount UL, busbar voltage amount Ud, direct-flow positive pole voltage-to-ground
U+, direct current cathode voltage-to-ground U- are sent into cpu controller 1 after processing, and cpu controller 1 is to alternating voltage amount UL, busbar voltage
Measure Ud, direct-flow positive pole voltage-to-ground U+, direct current cathode voltage-to-ground U- carry out calculation processing, starting Signal Generator of Ultra-low Frequency to
The ultra-low frequency signal electric current Id that a 0.125Hz is extremely injected to the earth is scurried into exchange, and intelligent decision exchange scurries into polarity, mode simultaneously
The resistance value of equivalent resistance R and the value of signal code Id are calculated, alternating voltage amount UL, busbar voltage are shown by display 1
Measure Ud, direct-flow positive pole voltage-to-ground U+, direct current cathode voltage-to-ground U-, equivalent resistance R and signal code Id value, alarm device hair
Alarm signal is scurried into exchange out, while sending equivalent resistance and signal code Id value by infrared emittance.
The Portable Orientation Instrument includes current amplifier, 0.125Hz with bandpass filter 2, phase comparator, A/D transformation
Device, cpu controller 2, infrared remote receiver, display 2, voice alarm, button, current amplifier are used to pincerlike mutual inductance
Device induction low current signal amplifies, and the secondary output of input termination forcipated mutual-inductor, output termination 0.125Hz with are logical
The input of filter 2；0.125Hz with bandpass filter 2 is used to extract the current signal of 0.125Hz, input termination Current amplifier
Output, the output of device terminate the input of phase comparator；Phase comparator is used to carry out phase ratio to the current signal of 0.125Hz
Compared with judging that it is capacity current or current in resistance property, the output of input termination 0.125Hz with bandpass filter 2, output termination A/
The input of D converter；A/D converter is used to the analog current signal of 0.125Hz to be transformed into can be by 2 identification of cpu controller
The digital signal of reason, output, the output of input termination phase comparator terminate the I/O mouth of cpu controller 2；Infrared remote receiver
For receiving the infrared signal that monitoring host is sent, and it is sent into cpu controller 2；Button be used to Portable Orientation Instrument into
Row working state control has communication button and detection button, and communication button is pressed, and cpu controller 2 starts infrared remote receiver and receives
The infrared signal that host is sent is monitored, realizes that signal is synchronous, detection button is pressed, and cpu controller 2 reads the output of A/D converter
Signal, the digital quantity that cpu controller 2 is sent into A/D converter carry out calculation processing and with infrared remote receiver received signal into
Row phase bit comparison calculates equivalent resistance and signal code Id value, shows equivalent resistance and signal code by display 2
Id value, voice alarm issue alarm signal.
The forcipated mutual-inductor is used to the ultralow frequency current signal size that induction monitoring host issues, using passive high-precision
D.C mutual-inductor.
The voltage acquisition circuit by resistor voltage divider network, direct current sampling, exchange extract, amplification filtering, signal condition 2,
A/D transformation composition, resistor voltage divider network are used to carry out pressure limiting to alternating voltage and DC voltage, two-way are divided after pressure limiting, is adopted all the way
Collect DC component, acquire AC compounent all the way, input connects on DC bus positive and negative anodes, and output connects direct current sampling respectively and hands over
Stream extracts；Direct current sampling is used to extract DC component voltage U+ and U-, and input connects the output of resistor voltage divider network, and output, which connects, puts
Big filtering；Amplification filtering is used to filter out the AC compounent in DC component, and input connects the output of direct current sampling, and output meets A/D
Transformation；Exchange, which is extracted, is used to extract the AC compounent voltage UL for scurrying into direct current, and input connects the output of resistor voltage divider network, output
Connect signal condition 2；Signal condition 2 is used to convert AC compounent voltage, so that it becomes can be by the signal of A/D transformation and acquisition
Amount, input connect the output that exchange is extracted, and output connects A/D transformation；A/D is converted while being acquired DC component voltage and AC compounent
Voltage, and change the digital signal amount that can be identified by cpu controller 1 into.
The Signal Generator of Ultra-low Frequency is by cpu controller 3, D/A transformation, 0.125Hz with bandpass filter 1, signal condition
1, power amplification, Capacitor apart, current-limiting resistor network composition, cpu controller 3 are used to generate the number letter that frequency is 0.125Hz
Number amount, output connect D/A transformation；D/A transformation is used to the digital signal quantitative change that cpu controller 3 exports to change analog signal amount into,
It inputs the I/O mouth for connecing cpu controller 3, and output connects the input of 0.125Hz with bandpass filter 1；0.125Hz with bandpass filter 1 is used
Remaining interference signal is filtered out to extract the useful signal of 0.125Hz, input connects the output of D/A transformation, and output connects signal condition 1
Input；Signal condition 1 is used to carry out waveform conditioning to the 0.125Hz useful signal of extraction, become it is symmetrical it is smooth just
String waveform, input connect the output of 0.125Hz with bandpass filter 1, and output connects the input of power amplification；Power amplification is used to amplify
The sinusoidal signal that signal condition 1 exports, input connect the output of signal condition 1, and output connects Capacitor apart；Capacitor apart be used to every
From DC component, input connects the output of power amplification, and output connects the input of current-limiting resistor network；Current-limiting resistor network be used to pair
0.125Hz signal carries out current-limiting protection, and input connects the output of Capacitor apart, and output connects the positive and negative anodes of direct current.
Detailed description of the invention
Fig. 1 is directly from direct-flow positive pole to greatly scurrying into schematic diagram.
Fig. 2 is directly from direct current cathode to greatly scurrying into schematic diagram.
To greatly scurrying into schematic diagram when Fig. 3 is directly from direct current positive and negative electrodes in same.
Fig. 4 be exchange through transition resistance from direct-flow positive pole to greatly scurrying into schematic diagram.
Fig. 5 be exchange through transition resistance from direct current cathode to greatly scurrying into schematic diagram.
Fig. 6 be exchange through transition resistance from direct current positive and negative electrodes in same when to greatly scurrying into schematic diagram.
Fig. 7 is that a lookup judgment method schematic diagram is scurried into present invention composition and exchange.
Fig. 8 is monitoring host and Portable Orientation Instrument implementation principle figure.
Fig. 9 is Signal Generator of Ultra-low Frequency and voltage acquisition circuit implementation principle figure.
Figure 10 is that exchange scurries into monitoring and scurries into a lookup implementation principle figure.
Specific embodiment
With reference to Fig. 7~Figure 10, the present invention is that a kind of exchange of direct current system scurries into localization of fault and searches device and method.
In conjunction with Fig. 7, the present invention is made of monitoring host, Portable Orientation Instrument and forcipated mutual-inductor, and monitoring host access is straight
Positive U+, cathode U- and the earth of busbar voltage are flowed, 1 anode A point of load is scurried into alternating current source UL, is equivalent to alternating current source UL is scurried into
The resistance that one resistance value is R, monitoring host inject a ultra-low frequency signal electric current Id, forcipated mutual-inductor access to anode over the ground
Portable Orientation Instrument, the flow direction lookup that forcipated mutual-inductor is clipped on the feeder line of load 1 along signal code Id are scurried into a little, are being loaded
The B point of 1 feeder line, Portable Orientation Instrument measurement have signal code Id, are searched down in the C point for loading 1 feeder line, Portable Orientation Instrument
Measuring signal electric current Id disappears, and A point a little just between b and c is scurried into judgement, that is, it is unexpected to load signal code on 1 feeder line
The point of disappearance is exactly to scurry into a little.
In conjunction with Fig. 8, the monitoring host includes voltage acquisition circuit, Signal Generator of Ultra-low Frequency, cpu controller 1, infrared
Transmitter, display 1, alarm device, voltage acquisition circuit are sent into after processing by acquisition alternating voltage amount, busbar voltage amount
Cpu controller 1, cpu controller 1 carry out calculation processing to alternating voltage amount, busbar voltage amount, start Signal Generator of Ultra-low Frequency
The ultra-low frequency signal electric current Id that a 0.125Hz is extremely injected to the earth is scurried into exchange, polarity, mode are scurried into intelligent decision exchange
And calculate the value of equivalent resistance resistance value and signal code Id, by display 1 show ac voltage, bus voltage value,
Equivalent resistance and signal code Id value, alarm device issues exchange and scurries into alarm signal, while passing through infrared emittance transmission etc.
Imitate resistance value and signal code Id value.Cpu controller 1 is made of the single-chip microcontroller of model STC89C58RD+, infrared transmitter by
Infrared coding/decoder of model MCP2120 and the infrared transceiver of model ZHX1010 are constituted, and display 1 is by 4.3 cun
Graphic control panel is constituted, and alarm device is made of alarm indicator and buzzer.
The Portable Orientation Instrument includes current amplifier, 0.125Hz with bandpass filter 2, phase comparator, A/D transformation
Device, cpu controller 2, infrared remote receiver, display 2, voice alarm, button, current amplifier are used to pincerlike mutual inductance
Device induction low current signal amplifies, and the secondary output of input termination forcipated mutual-inductor, output termination 0.125Hz with are logical
The input of filter 2；0.125Hz with bandpass filter 2 is used to extract the current signal of 0.125Hz, input termination Current amplifier
Output, the output of device terminate the input of phase comparator；Phase comparator is used to carry out phase ratio to the current signal of 0.125Hz
Compared with judging that it is capacity current or current in resistance property, the output of input termination 0.125Hz with bandpass filter 2, output termination A/
The input of D converter；A/D converter is used to the analog current signal of 0.125Hz to be transformed into can be by 2 identification of cpu controller
The digital signal of reason, output, the output of input termination phase comparator terminate the I/O mouth of cpu controller 2；Infrared remote receiver
For receiving the infrared signal that monitoring host is sent, and it is sent into cpu controller 2；Button be used to Portable Orientation Instrument into
Row working state control has communication button and detection button, and communication button is pressed, and cpu controller 2 starts infrared remote receiver and receives
The infrared signal that host is sent is monitored, realizes that signal is synchronous, detection button is pressed, and cpu controller 2 reads the output of A/D converter
Signal, the digital quantity that cpu controller 2 is sent into A/D converter carry out calculation processing and with infrared remote receiver received signal into
Row phase bit comparison calculates equivalent resistance and signal code Id value, shows equivalent resistance and signal code by display 2
Id value, voice alarm issue alarm signal.Current amplifier is made of integrated chip OP07 and resistance capacitance, 0.125Hz with
Bandpass filter 2 is made of integrated chip TL062 and resistance capacitance, and phase comparator is by integrated chip TL062 and resistance capacitance structure
At, A/D converter is made of 11 TLC2543 and resistance capacitance, cpu controller 2 by model STC89C58RD+ single-chip microcontroller
It constitutes, infrared remote receiver is by infrared coding/decoder of model MCP2120 and the infrared transceiver structure of model ZHX1010
At display 2 is made of OMJ4*8 liquid crystal display, and voice alarm is made of buzzer, and button is by communication key and spy
Button is surveyed to constitute.
The forcipated mutual-inductor is used to the ultralow frequency current signal size that induction monitoring host issues, using passive high-precision
D.C mutual-inductor.
In conjunction with Fig. 9, the voltage acquisition circuit is extracted by resistor voltage divider network, direct current sampling, exchange, amplification filters, letter
Number conditioning 2, A/D transformation composition, resistor voltage divider network are used to carry out pressure limiting to alternating voltage and DC voltage, are divided to two after pressure limiting
Road acquires DC component all the way, acquires AC compounent all the way, and input connects on DC bus positive and negative anodes, and output connects straight respectively
Stream samples and exchanges extraction；Direct current sampling is used to extract DC component voltage U+ and U-, and input connects the defeated of resistor voltage divider network
Out, output connects amplification filtering；Amplification filtering is used to filter out the AC compounent in DC component, and input connects the defeated of direct current sampling
Out, output connects A/D transformation；Exchange, which is extracted, is used to extract the AC compounent voltage for scurrying into direct current, and input connects resistor voltage divider network
Output, output connect signal condition 2；Signal condition 2 is used to convert AC compounent voltage, so that it becomes can be become by A/D
The semaphore of acquisition is changed, input connects the output that exchange is extracted, and output connects A/D transformation；A/D is converted while being acquired DC component electricity
Pressure and AC compounent voltage, and change the digital signal amount that can be identified by cpu controller 1 into.Resistor voltage divider network is by 1 200K electricity
Resistance and 1 20K resistance string are connected in anode and are connected in cathode composition with 1 200K resistance and 1 20K resistance string, and direct current extracts
It is made of 2K adjustable potentiometer and zener diode, amplification filtering is made of integrated chip TL062 and resistance capacitance, and exchange is extracted
The realization of 50Hz with bandpass filter circuit is made of integrated chip OP07 and resistance capacitance, signal condition 2 is by integrated chip TL062, electricity
It hinders capacitor and diode IN4148 is constituted, A/D transformation is made of 11 TLC2543 and resistance capacitance.
The Signal Generator of Ultra-low Frequency is by cpu controller 3, D/A transformation, 0.125Hz with bandpass filter 1, signal condition
1, power amplification, Capacitor apart, current-limiting resistor network composition, cpu controller 3 are used to generate the number letter that frequency is 0.125Hz
Number amount, output connect D/A transformation；D/A transformation is used to the digital signal quantitative change that cpu controller 3 exports to change analog signal amount into,
It inputs the I/O mouth for connecing cpu controller 3, and output connects the input of 0.125Hz with bandpass filter 1；0.125Hz with bandpass filter 1 is used
Remaining interference signal is filtered out to extract the useful signal of 0.125Hz, input connects the output of D/A transformation, and output connects signal condition 1
Input；Signal condition 1 is used to carry out waveform conditioning to the 0.125Hz useful signal of extraction, become it is symmetrical it is smooth just
String waveform, input connect the output of 0.125Hz with bandpass filter 1, and output connects the input of power amplification；Power amplification is used to amplify
The sinusoidal signal that signal condition 1 exports, input connect the output of signal condition 1, and output connects Capacitor apart；Capacitor apart be used to every
From DC component, input connects the output of power amplification, and output connects the input of current-limiting resistor network；Current-limiting resistor network be used to pair
0.125Hz signal carries out current-limiting protection, and input connects the output of Capacitor apart, and output connects the positive and negative anodes of direct current.Cpu controller 3
It is made of the single-chip microcontroller of model STC89C58RD+, D/A transformation is made of analog-digital chip DAC7512,0.125Hz with leads to
Filter 1 is made of integrated chip TL062 and resistance capacitance, signal condition 1 is by integrated chip TL062, resistance capacitance and adjustable
Potentiometer is constituted, power amplification is made of power amplifier integrated chip OPA445 and resistance capacitance, Capacitor apart is by there are two electrolysis electricity
The connected composition of appearance cathode, current-limiting resistor network is connected on direct-flow positive pole by 3 10K/2W resistance strings and 3 10K/2W resistance strings
It is connected on direct current cathode and constitutes.
In conjunction with Figure 10, direct current system loads the generation exchange of 1 branch and scurries into failure, and monitoring host is adopted by voltage acquisition circuit
Collection alternating voltage amount, busbar voltage amount are sent into cpu controller 1 after processing, and cpu controller 1 is to alternating voltage amount, busbar voltage
Amount carries out calculation processing, and intelligent decision exchange scurries into polarity, mode and calculates equivalent resistance resistance value and signal code Id
Value, starting Signal Generator of Ultra-low Frequency are scurried into the ultra-low frequency signal electric current Id for extremely injecting a 0.125Hz to the earth to exchange, are led to
It crosses display 1 and shows ac voltage, bus voltage value, equivalent resistance and signal code Id value, alarm device issues exchange and alters
Enter alarm signal, while equivalent resistance and signal code Id value are sent by infrared emittance.It is logical on Portable Orientation Instrument
News press key pressing, receive the infrared signal that monitoring host is sent and realize that signal is synchronous；Forcipated mutual-inductor accesses Portable Orientation Instrument,
And the size of 1 feeder line branch road inductive signal electric current Id of load is clipped in along signal code flow direction, the weak current of induction is through electricity
Stream amplifier amplification, 0.125Hz with bandpass filter 2 extract the current signal of 0.125Hz, phase comparator to the electricity of 0.125Hz
Flow signal carry out phase bit comparison, A/D converter is transformed into 0.125Hz analog current signal can be by 2 identifying processing of cpu controller
Digital signal, detection button press, cpu controller 2 read A/D converter output signal, cpu controller 2 is to A/D converter
The digital quantity of feeding carries out calculation processing and carries out phase bit comparison with infrared remote receiver received signal, calculates equivalent resistance
And signal code Id value, show that equivalent resistance and signal code Id value, voice alarm issue alarm letter by display 2
Number.
Claims (1)
1. a kind of direct current system exchange scurries into localization of fault and searches device, when exchange, which occurs, for direct current system any point scurries into,
The specific physical location that exchange is scurried into quickly can be accurately searched and located, failure is eliminated, generation second point exchange is avoided to scurry into
And cause direct current positive and negative anodes short-circuit, guarantee direct current system safe operation, it is characterised in that:
Comprising monitoring host, Portable Orientation Instrument and forcipated mutual-inductor, monitoring host is used to measure the alternating voltage UL scurried into, straight
Streaming system busbar voltage Ud, direct-flow positive pole voltage-to-ground U+, direct current cathode voltage-to-ground U- and transmission ultralow frequency current signal Id,
Portable Orientation Instrument is used to search and locate the specific physical location that exchange is scurried into, and forcipated mutual-inductor is for the sending of induction monitoring host
Ultralow frequency current signal, when there is exchange to scurry into direct current, monitoring host measures the alternating voltage UL scurried into, and direct current system is female
Polarity, mode and meter are scurried into line voltage Ud, direct-flow positive pole voltage-to-ground U+, direct current cathode voltage-to-ground U-, intelligent decision exchange
Equivalent resistance resistance value R is calculated, and scurries into the ultralow frequency current signal Id for extremely injecting a 0.125Hz to the earth, root to exchange
According to the mode that exchange is scurried into, alternating current source is equivalent to resistance eutral grounding, and looking into for resistance eutral grounding point can be regarded as by exchanging the lookup scurried into a little
It looks for, forcipated mutual-inductor accesses Portable Orientation Instrument, and Portable Orientation Instrument and monitoring host are emitted by infrared signal and received real
Existing signal is synchronous, is exchanged with Portable Orientation Instrument along the flow direction lookup of ultralow frequency current signal Id with forcipated mutual-inductor and scurries into event
Hinder point, finding the position that ultralow frequency current signal Id suddenly disappears is exactly the position of failure point that exchange is scurried into；
The monitoring host includes voltage acquisition circuit, Signal Generator of Ultra-low Frequency, cpu controller 1, infrared transmitter, display
Device 1, alarm device, voltage acquisition circuit pass through acquisition alternating voltage UL, direct current system busbar voltage Ud, direct-flow positive pole voltage-to-ground
U+, direct current cathode voltage-to-ground U- are sent into cpu controller 1 after processing, and cpu controller 1 is female to alternating voltage UL, direct current system
Line voltage Ud, direct-flow positive pole voltage-to-ground U+, direct current cathode voltage-to-ground U- carry out calculation processing, start ultra-low frequency signal
Device scurries into the ultralow frequency current signal Id that a 0.125Hz is extremely injected to the earth to exchange, and polarity, side are scurried into intelligent decision exchange
Formula simultaneously calculates the resistance value of equivalent resistance resistance value R and the value of ultralow frequency current signal Id, shows alternating current by display 1
Press UL, direct current system busbar voltage Ud, direct-flow positive pole voltage-to-ground U+, direct current cathode voltage-to-ground U-, equivalent resistance resistance value R
And ultralow frequency current signal Id value, alarm device issues exchange and scurries into alarm signal, while sending equivalent electricity by infrared transmitter
Resistance value and ultralow frequency current signal Id value；
The Portable Orientation Instrument include current amplifier, 0.125Hz with bandpass filter 2, phase comparator, A/D converter,
Cpu controller 2, infrared remote receiver, display 2, voice alarm, button, current amplifier are used to forcipated mutual-inductor
Induction low current signal amplifies, secondary output, the logical filter of output termination 0.125Hz with of input termination forcipated mutual-inductor
The input of wave device 2；0.125Hz with bandpass filter 2 is used to extract the current signal of 0.125Hz, input termination current amplifier
Output, output termination phase comparator input；Phase comparator is used to carry out phase ratio to the current signal of 0.125Hz
Compared with judging that it is capacity current or current in resistance property, the output of input termination 0.125Hz with bandpass filter 2, output termination A/
The input of D converter；A/D converter is used to the analog current signal of 0.125Hz to be transformed into can be by 2 identification of cpu controller
The digital signal of reason, output, the output of input termination phase comparator terminate the I/O mouth of cpu controller 2；Infrared remote receiver
For receiving the infrared signal that monitoring host is sent, and it is sent into cpu controller 2；Button be used to Portable Orientation Instrument into
Row working state control has communication button and detection button, and communication button is pressed, and cpu controller 2 starts infrared remote receiver and receives
The infrared signal that host is sent is monitored, realizes that signal is synchronous, detection button is pressed, and cpu controller 2 reads the output of A/D converter
Signal, the digital quantity that cpu controller 2 is sent into A/D converter carry out calculation processing and with infrared remote receiver received signal into
Row phase bit comparison calculates equivalent resistance and ultralow frequency current signal Id value, shows equivalent resistance by display 2 and surpasses
Low-frequency current signal Id value, voice alarm issue alarm signal；
The forcipated mutual-inductor is used to the ultralow frequency current signal size that induction monitoring host issues, using passive high-precision AC
Mutual inductor；
The voltage acquisition circuit is extracted by resistor voltage divider network, direct current sampling, exchange, amplifies filtering, signal condition 2, A/D become
Composition is changed, resistor voltage divider network is used to carry out pressure limiting to alternating voltage and DC voltage, two-way is divided after pressure limiting, acquires direct current all the way
Component, acquires AC compounent all the way, and input connects on DC bus positive and negative anodes, and output connects direct current sampling respectively and mentions with exchanging
It takes；Direct current sampling is used to extract direct-flow positive pole voltage-to-ground U+ and direct current cathode voltage-to-ground U-, and input connects voltage-splitter resistance net
The output of network, output connect amplification filtering；Amplification filtering is used to filter out the AC compounent in DC component, and input connects direct current sampling
Output, output connect A/D transformation；Exchange, which is extracted, is used to extract the alternating voltage UL for scurrying into direct current, and input connects voltage-splitter resistance net
The output of network, output connect signal condition 2；Signal condition 2 is used to convert AC compounent voltage, so that it becomes can be by A/D
The semaphore of transformation and acquisition, input connect the output that exchange is extracted, and output connects A/D transformation；A/D is converted while being acquired DC component
Voltage and AC compounent voltage, and change the digital signal amount that can be identified by cpu controller 1 into；
The Signal Generator of Ultra-low Frequency is by cpu controller 3, D/A transformation, 0.125Hz with bandpass filter 1, signal condition 1, function
Rate amplification, Capacitor apart, current-limiting resistor network composition, cpu controller 3 are used to generate the digital signal amount that frequency is 0.125Hz,
It, which is exported, connects D/A transformation；D/A transformation is used to the digital signal quantitative change that cpu controller 3 exports to change analog signal amount into, defeated
Enter to connect the I/O mouth of cpu controller 3, output connects the input of 0.125Hz with bandpass filter 1；0.125Hz with bandpass filter 1 is used to mention
The useful signal of 0.125Hz is taken to filter out remaining interference signal, input connects the output of D/A transformation, and output connects the defeated of signal condition 1
Enter；Signal condition 1 is used to carry out waveform conditioning to the 0.125Hz useful signal of extraction, becomes symmetrical smooth sine wave
Shape, input connect the output of 0.125Hz with bandpass filter 1, and output connects the input of power amplification；Power amplification is used to amplified signal
The sinusoidal signal of 1 output of conditioning, input connect the output of signal condition 1, and output connects Capacitor apart；Capacitor apart is used to be isolated straight
Flow component, input connect the output of power amplification, and output connects the input of current-limiting resistor network；Current-limiting resistor network be used to pair
0.125Hz signal carries out current-limiting protection, and input connects the output of Capacitor apart, and output connects the positive and negative anodes of direct current.
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| CN108872684A (en) * | 2018-09-18 | 2018-11-23 | 上海固缘电力科技有限公司 | A kind of novel passive AC current collecting circuit |
| 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 |
| CN111487504B (en) * | 2020-04-29 | 2022-05-13 | 南京国臣直流配电科技有限公司 | Rapid protection method for alternating current fleeing into direct current fault of direct current system |
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| CN114123742A (en) * | 2021-11-11 | 2022-03-01 | 广西电网有限责任公司玉林供电局 | Alternating current channeling suppression circuit and device of direct current system for station |
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