CN105938167A - DC system AC fleeing fault point positioning search apparatus and method - Google Patents
DC system AC fleeing fault point positioning search apparatus and method Download PDFInfo
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- CN105938167A CN105938167A CN201610425169.0A CN201610425169A CN105938167A CN 105938167 A CN105938167 A CN 105938167A CN 201610425169 A CN201610425169 A CN 201610425169A CN 105938167 A CN105938167 A CN 105938167A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a DC system AC fleeing fault point positioning search apparatus and method, and provides a method for rapidly searching for a physical position of a fault point of AC fleeing into a DC system. When AC fleeing takes place at any one point of the DC system, the concrete physical position of the AC fleeing can be rapidly and accurately searched and positioned, the fault is eliminated, a DC anode and cathode short circuit caused by the AC fleeing of a second point is prevented, and safe operation of the DC system is guaranteed. The method comprises a monitoring host, a hand-held position indicator and a clamp mutual inductor. When the AC fleeing into DC, the monitoring host measures a value UL of a fled AC amount, a value Ud of DC voltage, an anode grounding voltage value U+ and a cathode grounding voltage value U-, the polarity and the mode of the AC fleeing are intelligently determined, a resistance value R of an equivalent resistor is calculated, ultralow-frequency signal current Id of 0.125Hz is injected to AC fleeing pole ground according to an AC fleeing mode, an AC source is equivalent to grounding of a resistor, search for an AC fleeing point can be seen as search for a resistor access point, the clamp mutual inductor is connected with the hand-held position indicator, the hand-held position indicator and the monitoring host realize signal synchronization through infrared signal emission and receiving, the fault point of the AC fleeing is searched along the fleeing direction of the signal current Id by use of the clamp mutual inductor and the hand-held position indicator, and the searched position where the signal current Id suddenly disappears is the position of the fault point of the AC fleeing.
Description
Technical field
The present invention relates to a kind of straight-flow system exchange and scurry into localization of fault lookup device and method, belong to straight-flow system monitoring field.
Background technology
According to " preventing 25 important requirements of power generation accident " (National Energy Board's safety [2014] 161) " the 22.2.3.22 article:be strictly on guard against exchange scurry into DC Line Fault occur. " " 22.2.3.23.3 article: the electric substation of newly-built or transformation, DC power system insulation monitoring and warning device, should possess to exchange and alter survey note and the warning function .Original DC power system insulation monitoring and warning device of DC Line Fault, should progressively transform so that it is possesses exchange and alters survey note and the warning function of DC Line Fault. " regulation, the most manufacturer production goes out the survey note alarm device scurrying into straight-flow system about exchange, also has Patents document.
But, scurry into straight-flow system due to exchange and there is intermittence, disguise and the complexity in straight-flow system loop, this kind of monitoring device and patent documentation all can not exchange the trouble point scurried into by positioning searching, that is when straight-flow system is scurried in exchange, this kind of device and patent documentation have been only able to detect exchange and have scurried into, and can not judge that exchange is from which branch road to scurry into, more Search and Orientation can not exchange the concrete physical location scurried into, can not accomplish that DC Line Fault is scurried in elimination exchange promptly and accurately, bury hidden trouble to the safety in production of factory/stand.
Divide from the mode of scurrying into, exchange is scurried into straight-flow system and can be divided into and directly scurry into and scurry into through transition resistance, owing to the N pole of alternating current is ground connection, so directly scurrying into mode alternating current source UL can be regarded as a 0K resistance eutral grounding, scurrying into mode through transition resistance and alternating current source UL can be regarded as a resistance value is the resistance eutral grounding of R.From scurry into polarity to a point exchange scurry into straight-flow system can be divided into scurry into from direct-flow positive pole, scurry into from direct current negative pole, from direct current positive and negative electrodes in same time scurry into.
Fig. 1 ~ Fig. 6 is the schematic diagram that straight-flow system is scurried in exchange, and wherein, Fig. 1 is directly to scurry into schematic diagram over the ground from direct-flow positive pole, 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 schematic diagram over the ground from direct current negative pole, is presented as that alternating current source UL is directly superimposed upon direct current negative pole to big ground；Fig. 3 is directly when direct current positive and negative electrodes in same, the earth to be scurried into schematic diagram, be presented as alternating current source UL be superimposed upon the most simultaneously direct current negative pole to the earth and positive pole to big on the ground；Fig. 4 is that the earth is scurried into schematic diagram through transition resistance from direct-flow positive pole by alternating current source UL, is presented as that alternating current source UL is superimposed upon direct-flow positive pole to big ground through a transition resistance；Fig. 5 is that the earth is scurried into schematic diagram through transition resistance from direct current negative pole by alternating current source UL, is presented as that alternating current source UL is superimposed upon direct current negative pole to big ground through a transition resistance；Fig. 6 is that the earth is scurried into schematic diagram when transition resistance is from direct current positive and negative electrodes in same by alternating current source UL, be presented as alternating current source UL respectively through a transition resistance be superimposed upon direct current negative pole to the earth and positive pole to big on the ground.
Exchange is scurried into straight-flow system and will be had a strong impact on the safe operation of system, especially described exchange N the most directly scurries into or scurries into and scurry into from direct current is positive and negative through transition resistance simultaneously from direct current is positive and negative through arc suppression coil simultaneously, easily cause the short circuit of direct current both positive and negative polarity, very big hidden danger is buried to the safe operation of straight-flow system, so when straight-flow system any point generation exchange is scurried into, fault must be eliminated the most accurately, cause the short circuit of direct current both positive and negative polarity to avoid occurring second point exchange to scurry into.
Summary of the invention
It is an object of the invention to, there is provided a kind of and can quickly search the method that DC system fault point physical location is scurried in exchange, when straight-flow system any point generation exchange is scurried into, Search and Orientation can exchange the concrete physical location scurried into the most accurately, eliminate fault, avoid occurring second point exchange to scurry into and cause the short circuit of direct current both positive and negative polarity, it is ensured that straight-flow system safe operation.
The inventive method comprises monitoring main frame, Portable Orientation Instrument and forcipated mutual-inductor, monitoring main frame is used for measuring alternating voltage UL, straight-flow system busbar voltage Ud, direct-flow positive pole voltage-to-ground U+, the direct current negative pole voltage-to-ground U-scurried into and sending out intrasonic current signal Id, Portable Orientation Instrument is used for Search and Orientation and exchanges the concrete physical location scurried into, and forcipated mutual-inductor is used for the intrasonic current signal that induction monitoring main frame sends.nullWhen there being exchange to scurry into direct current，Value UL of the of ac scurried into measured by monitoring main frame，Value Ud of DC voltage、Positive pole voltage-to-ground value U+、Negative pole voltage-to-ground value U-，Polarity is scurried in intelligent decision exchange、Mode and calculate equivalent resistance resistance value R，And scurry into extremely to the ultra-low frequency signal electric current Id greatly injecting a 0.125Hz to exchange，The mode scurried into according to exchange，Alternating current source is equivalent to resistance eutral grounding，The exchange lookup scurried into a little both can regard the lookup of resistance eutral grounding point as，Forcipated mutual-inductor accesses Portable Orientation Instrument，It is Tong Bu that Portable Orientation Instrument realizes signal with monitoring main frame by infrared signal transmitting and reception，Search to exchange along the flow direction of signal code Id with forcipated mutual-inductor and Portable Orientation Instrument and scurry into trouble point，Find the position of failure point that the position that signal code Id suddenly disappears is exactly exchange and scurries into.
nullDescribed monitoring main frame comprises voltage acquisition circuit、Signal Generator of Ultra-low Frequency、Cpu controller 1、Infrared transmitter、Display 1、Warner，Voltage acquisition circuit is by gathering alternating voltage amount UL、Busbar voltage amount Ud、Direct-flow positive pole voltage-to-ground U+、Direct current negative pole voltage-to-ground U-sends into cpu controller 1 after treatment，Cpu controller 1 is to alternating voltage amount UL、Busbar voltage amount Ud、Direct-flow positive pole voltage-to-ground U+、Direct current negative pole voltage-to-ground U-carries out calculating process，Start Signal Generator of Ultra-low Frequency and scurry into the ultra-low frequency signal electric current Id that extremely the earth is injected a 0.125Hz to exchange，Polarity is scurried in intelligent decision exchange、Mode also calculates resistance value and the value of signal code Id of equivalent resistance R，Alternating voltage amount UL is shown by display 1、Busbar voltage amount Ud、Direct-flow positive pole voltage-to-ground U+、Direct current negative pole voltage-to-ground U-、Equivalent resistance R and signal code Id value，Warner sends exchange and scurries into warning signal，Send equivalent resistance and signal code Id value by infrared emittance simultaneously.
Described Portable Orientation Instrument comprises current amplifier, 0.125Hz bandpass filter 2, phase comparator, A/D changer, cpu controller 2, infrared remote receiver, display 2, voice alarm, button, current amplifier is used for being amplified forcipated mutual-inductor sensing low current signal, the secondary output of its input termination forcipated mutual-inductor, the input of output termination 0.125Hz bandpass filter 2；0.125Hz bandpass filter 2 is used for extracting the current signal of 0.125Hz, the output of its input termination current amplifier, the input of output termination phase comparator；Phase comparator is used for the current signal of 0.125Hz is carried out phase bit comparison, it is judged that it is capacity current or current in resistance property, the output of its input termination 0.125Hz bandpass filter 2, the input of output termination A/D changer；A/D changer can be by the digital signal of cpu controller 2 identifying processing for the analog current signal of 0.125Hz is transformed into, the output of its input termination phase comparator, the I/O mouth of output termination cpu controller 2；Infrared remote receiver is used for receiving the infrared signal that monitoring main frame sends, and sends into cpu controller 2；Button is used for being operated Portable Orientation Instrument state control, there are communication button and detection button, communication button is pressed, cpu controller 2 starts infrared remote receiver and receives the infrared signal that monitoring main frame sends, realize signal to synchronize, detection button is pressed, cpu controller 2 reads A/D changer output signal, cpu controller 2 carries out calculating process to the digital quantity that A/D changer is sent into and the signal with infrared remote receiver reception carries out phase bit comparison, calculate equivalent resistance and signal code Id value, equivalent resistance and signal code Id value is shown by display 2, voice alarm sends warning signal.
Described forcipated mutual-inductor is used for the intrasonic current signal size that induction monitoring main frame sends, and uses passive high-precision AC transformer.
Described voltage acquisition circuit is made up of resistor voltage divider network, direct current sampling, exchange extraction, amplification filtering, signal condition 2, A/D conversion, resistor voltage divider network is used for alternating voltage and DC voltage are carried out pressure limiting, point two-way after pressure limiting, one tunnel gathers DC component, one tunnel gathers AC compounent, its input is connected on dc bus both positive and negative polarity, and output connects direct current sampling respectively and exchanges extraction；Direct current sampling is used for extracting DC component voltage U+ and U-, and its input connects the output of resistor voltage divider network, and output connects amplification filtering；Amplifying filtering to be used for filtering the AC compounent in DC component, its input connects the output of direct current sampling, and output connects A/D conversion；Exchange is extracted and is used for extracting the AC compounent voltage UL scurrying into direct current, and its input connects the output of resistor voltage divider network, and output connects signal condition 2；Signal condition 2 is used for converting AC compounent voltage so that it is becoming the semaphore that can be gathered by A/D conversion, its input connects the output that exchange is extracted, and output connects A/D conversion；A/D conversion gathers DC component voltage and AC compounent voltage simultaneously, and changes the digital signal amount that can be identified by cpu controller 1 into.
Described Signal Generator of Ultra-low Frequency is made up of cpu controller 3, D/A conversion, 0.125Hz bandpass filter 1, signal condition 1, power amplification, Capacitor apart, current-limiting resistor network, cpu controller 3 is used for producing the digital signal amount that frequency is 0.125Hz, and its output connects D/A conversion；The digital signal quantitative change that D/A conversion is used for cpu controller 3 to export changes analogue signal amount into, and its input connects the I/O mouth of cpu controller 3, and output connects the input of 0.125Hz bandpass filter 1；0.125Hz bandpass filter 1 is used for extracting the useful signal of 0.125Hz and filters remaining interference signal, and its input connects the output of D/A conversion, and output connects the input of signal condition 1；The signal condition 1 0.125Hz useful signal being used for extracting carries out waveform conditioning so that it is become symmetrical smooth sinusoidal wave form, and its input connects the output of 0.125Hz bandpass filter 1, and output connects the input of power amplification；Power amplification is used for amplifying the sinusoidal signal of signal condition 1 output, and its input connects the output of signal condition 1, and output connects Capacitor apart；Capacitor apart is used for isolated DC component, and its input connects the output of power amplification, and output connects the input of current-limiting resistor network；Current-limiting resistor network is used for 0.125Hz signal is carried out current-limiting protection, and its input connects the output of Capacitor apart, and output connects the both positive and negative polarity of direct current.
Accompanying drawing explanation
Fig. 1 is directly from direct-flow positive pole, the earth to be scurried into schematic diagram.
Fig. 2 is directly from direct current negative pole, the earth to be scurried into schematic diagram.
Fig. 3 is directly when direct current positive and negative electrodes in same, the earth to be scurried into schematic diagram.
Fig. 4 is to exchange from direct-flow positive pole, the earth to be scurried into schematic diagram through transition resistance.
Fig. 5 is to exchange from direct current negative pole, the earth to be scurried into schematic diagram through transition resistance.
Fig. 6 is that the earth is scurried into schematic diagram when transition resistance is from direct current positive and negative electrodes in same by exchange.
Fig. 7 is that the present invention forms and exchanges to scurry into and searches a determination methods schematic diagram.
Fig. 8 is monitoring main frame and Portable Orientation Instrument enforcement schematic diagram.
Fig. 9 is Signal Generator of Ultra-low Frequency and voltage acquisition circuit enforcement schematic diagram.
Figure 10 is that exchange is scurried into monitoring and scurries into a lookup enforcement schematic diagram.
Detailed description of the invention
With reference to Fig. 7 ~ Figure 10, the present invention is that localization of fault lookup device and method is scurried in a kind of straight-flow system exchange.
nullIn conjunction with Fig. 7，The present invention is by monitoring main frame、Portable Orientation Instrument and forcipated mutual-inductor composition，Monitoring main frame accesses the positive pole U+ of DC bus-bar voltage、Negative pole U-and the earth，Load 1 positive pole A point and scurry into alternating current source UL，It is the resistance of R scurry into alternating current source UL being equivalent to a resistance value，Monitoring main frame injects a ultra-low frequency signal electric current Id over the ground to positive pole，Forcipated mutual-inductor accesses Portable Orientation Instrument，The flow direction lookup that forcipated mutual-inductor is clipped on the feeder line of load 1 along signal code Id is scurried into a little，B point at load 1 feeder line，Portable Orientation Instrument measurement has signal code Id，Down search the C point at load 1 feeder line，Portable Orientation Instrument is measured signal code Id and is disappeared，Judge to scurry into a little A point the most between b and c，I.e. load the point that signal code on 1 feeder line suddenly disappears to scurry into exactly a little.
nullIn conjunction with Fig. 8，Described monitoring main frame comprises voltage acquisition circuit、Signal Generator of Ultra-low Frequency、Cpu controller 1、Infrared transmitter、Display 1、Warner，Voltage acquisition circuit is by gathering alternating voltage amount、Busbar voltage amount sends into cpu controller 1 after treatment，Cpu controller 1 is to alternating voltage amount、Busbar voltage amount carries out calculating process，Start Signal Generator of Ultra-low Frequency and scurry into the ultra-low frequency signal electric current Id that extremely the earth is injected a 0.125Hz to exchange，Polarity is scurried in intelligent decision exchange、Mode also calculates equivalent resistance resistance value and the value of signal code Id，Ac voltage is shown by display 1、Bus voltage value、Equivalent resistance and signal code Id value，Warner sends exchange and scurries into warning signal，Send equivalent resistance and signal code Id value by infrared emittance simultaneously.Cpu controller 1 is made up of the single-chip microcomputer that model is STC89C58RD+, infrared transmitter is made up of with the infrared transceiver that model is ZHX1010 infrared coding/decoder that model is MCP2120, display 1 is made up of 4.3 cun of graphic control panels, and warner is made up of alarm indicator and buzzer.
Described Portable Orientation Instrument comprises current amplifier, 0.125Hz bandpass filter 2, phase comparator, A/D changer, cpu controller 2, infrared remote receiver, display 2, voice alarm, button, current amplifier is used for being amplified forcipated mutual-inductor sensing low current signal, the secondary output of its input termination forcipated mutual-inductor, the input of output termination 0.125Hz bandpass filter 2；0.125Hz bandpass filter 2 is used for extracting the current signal of 0.125Hz, the output of its input termination current amplifier, the input of output termination phase comparator；Phase comparator is used for the current signal of 0.125Hz is carried out phase bit comparison, it is judged that it is capacity current or current in resistance property, the output of its input termination 0.125Hz bandpass filter 2, the input of output termination A/D changer；A/D changer can be by the digital signal of cpu controller 2 identifying processing for the analog current signal of 0.125Hz is transformed into, the output of its input termination phase comparator, the I/O mouth of output termination cpu controller 2；Infrared remote receiver is used for receiving the infrared signal that monitoring main frame sends, and sends into cpu controller 2；Button is used for being operated Portable Orientation Instrument state control, there are communication button and detection button, communication button is pressed, cpu controller 2 starts infrared remote receiver and receives the infrared signal that monitoring main frame sends, realize signal to synchronize, detection button is pressed, cpu controller 2 reads A/D changer output signal, cpu controller 2 carries out calculating process to the digital quantity that A/D changer is sent into and the signal with infrared remote receiver reception carries out phase bit comparison, calculate equivalent resistance and signal code Id value, equivalent resistance and signal code Id value is shown by display 2, voice alarm sends warning signal.Current amplifier is made up of integrated chip OP07 and resistance capacitance, 0.125Hz bandpass filter 2 is made up of integrated chip TL062 and resistance capacitance, phase comparator is made up of integrated chip TL062 and resistance capacitance, A/D changer is made up of 11 TLC2543 and resistance capacitance, cpu controller 2 is made up of the single-chip microcomputer that model is STC89C58RD+, infrared remote receiver is made up of with the infrared transceiver that model is ZHX1010 infrared coding/decoder that model is MCP2120, display 2 is made up of OMJ4*8 LCDs, voice alarm is made up of buzzer, button is made up of communication key and detection button.
Described forcipated mutual-inductor is used for the intrasonic current signal size that induction monitoring main frame sends, and uses passive high-precision AC transformer.
In conjunction with Fig. 9, described voltage acquisition circuit is made up of resistor voltage divider network, direct current sampling, exchange extraction, amplification filtering, signal condition 2, A/D conversion, resistor voltage divider network is used for alternating voltage and DC voltage are carried out pressure limiting, point two-way after pressure limiting, one tunnel gathers DC component, one tunnel gathers AC compounent, and its input is connected on dc bus both positive and negative polarity, and output connects direct current sampling respectively and exchanges extraction；Direct current sampling is used for extracting DC component voltage U+ and U-, and its input connects the output of resistor voltage divider network, and output connects amplification filtering；Amplifying filtering to be used for filtering the AC compounent in DC component, its input connects the output of direct current sampling, and output connects A/D conversion；Exchange is extracted and is used for extracting the AC compounent voltage scurrying into direct current, and its input connects the output of resistor voltage divider network, and output connects signal condition 2；Signal condition 2 is used for converting AC compounent voltage so that it is becoming the semaphore that can be gathered by A/D conversion, its input connects the output that exchange is extracted, and output connects A/D conversion；A/D conversion gathers DC component voltage and AC compounent voltage simultaneously, and changes the digital signal amount that can be identified by cpu controller 1 into.Resistor voltage divider network is connected on positive pole and 1 200K resistance by 1 200K resistance and 1 20K resistant series and 1 20K resistant series is connected on negative pole and constitutes, direct current extracts and is made up of 2K adjustable potentiometer and Zener diode, amplify filtering to be made up of integrated chip TL062 and resistance capacitance, exchange is extracted and is made up of the realization of 50Hz bandpass filter circuit integrated chip OP07 and resistance capacitance, signal condition 2 is made up of integrated chip TL062, resistance capacitance and diode IN4148, and A/D conversion is made up of 11 TLC2543 and resistance capacitance.
Described Signal Generator of Ultra-low Frequency is made up of cpu controller 3, D/A conversion, 0.125Hz bandpass filter 1, signal condition 1, power amplification, Capacitor apart, current-limiting resistor network, cpu controller 3 is used for producing the digital signal amount that frequency is 0.125Hz, and its output connects D/A conversion；The digital signal quantitative change that D/A conversion is used for cpu controller 3 to export changes analogue signal amount into, and its input connects the I/O mouth of cpu controller 3, and output connects the input of 0.125Hz bandpass filter 1；0.125Hz bandpass filter 1 is used for extracting the useful signal of 0.125Hz and filters remaining interference signal, and its input connects the output of D/A conversion, and output connects the input of signal condition 1；The signal condition 1 0.125Hz useful signal being used for extracting carries out waveform conditioning so that it is become symmetrical smooth sinusoidal wave form, and its input connects the output of 0.125Hz bandpass filter 1, and output connects the input of power amplification；Power amplification is used for amplifying the sinusoidal signal of signal condition 1 output, and its input connects the output of signal condition 1, and output connects Capacitor apart；Capacitor apart is used for isolated DC component, and its input connects the output of power amplification, and output connects the input of current-limiting resistor network；Current-limiting resistor network is used for 0.125Hz signal is carried out current-limiting protection, and its input connects the output of Capacitor apart, and output connects the both positive and negative polarity of direct current.Cpu controller 3 is made up of the single-chip microcomputer that model is STC89C58RD+, D/A conversion is made up of analog-digital chip DAC7512, 0.125Hz bandpass filter 1 is made up of integrated chip TL062 and resistance capacitance, signal condition 1 is by integrated chip TL062, resistance capacitance and adjustable potentiometer are constituted, power amplification is made up of power amplifier integrated chip OPA445 and resistance capacitance, by having, two electrochemical capacitor negative poles are connected to be constituted Capacitor apart, current-limiting resistor network is connected on direct-flow positive pole by 3 10K/2W resistant series and 3 10K/2W resistant series are connected on direct current negative pole and constitute.
In conjunction with Figure 10, straight-flow system loads 1 branch road generation exchange and scurries into fault, monitoring main frame gathers alternating voltage amount by voltage acquisition circuit, busbar voltage amount sends into cpu controller 1 after treatment, cpu controller 1 is to alternating voltage amount, busbar voltage amount carries out calculating process, polarity is scurried in intelligent decision exchange, mode also calculates equivalent resistance resistance value and the value of signal code Id, start Signal Generator of Ultra-low Frequency and scurry into the ultra-low frequency signal electric current Id that extremely the earth is injected a 0.125Hz to exchange, ac voltage is shown by display 1, bus voltage value, equivalent resistance and signal code Id value, warner sends exchange and scurries into warning signal, send equivalent resistance and signal code Id value by infrared emittance simultaneously.Communication button on Portable Orientation Instrument is pressed, and the infrared signal receiving monitoring main frame transmission realizes signal synchronization；nullForcipated mutual-inductor accesses Portable Orientation Instrument，And flow to be clipped in the size of induced signal electric current Id on load 1 feeder line branch road along signal code，The weak current of sensing amplifies through current amplifier、0.125Hz bandpass filter 2 extracts the current signal of 0.125Hz、Phase comparator carries out phase bit comparison to the current signal of 0.125Hz、A/D changer is transformed into 0.125Hz analog current signal can be by the digital signal of cpu controller 2 identifying processing，Detection button is pressed，Cpu controller 2 reads A/D changer output signal，Cpu controller 2 carries out calculating process to the digital quantity that A/D changer is sent into and the signal with infrared remote receiver reception carries out phase bit comparison，Calculate equivalent resistance and signal code Id value，Equivalent resistance and signal code Id value is shown by display 2，Voice alarm sends warning signal.
Claims (6)
1. the present invention is that localization of fault lookup device and method is scurried in a kind of straight-flow system exchange, when straight-flow system any point generation exchange is scurried into, Search and Orientation can exchange the concrete physical location scurried into the most accurately, eliminate fault, avoid occurring second point exchange to scurry into and cause the short circuit of direct current both positive and negative polarity, ensure straight-flow system safe operation, it is characterised in that:
nullThe present invention comprises monitoring main frame、Portable Orientation Instrument and forcipated mutual-inductor，Monitoring main frame is used for measuring the alternating voltage UL scurried into、Straight-flow system busbar voltage Ud、Direct-flow positive pole voltage-to-ground U+、A direct current negative pole voltage-to-ground U-and intrasonic current signal Id，Portable Orientation Instrument is used for Search and Orientation and exchanges the concrete physical location scurried into，Forcipated mutual-inductor is used for the intrasonic current signal that induction monitoring main frame sends，When there being exchange to scurry into direct current，Value UL of the of ac scurried into measured by monitoring main frame，Value Ud of DC voltage、Positive pole voltage-to-ground value U+、Negative pole voltage-to-ground value U-，Polarity is scurried in intelligent decision exchange、Mode and calculate equivalent resistance resistance value R，And scurry into extremely to the ultra-low frequency signal electric current Id greatly injecting a 0.125Hz to exchange，The mode scurried into according to exchange，Alternating current source is equivalent to resistance eutral grounding，The exchange lookup scurried into a little both can regard the lookup of resistance eutral grounding point as，Forcipated mutual-inductor accesses Portable Orientation Instrument，It is Tong Bu that Portable Orientation Instrument realizes signal with monitoring main frame by infrared signal transmitting and reception，Search to exchange along the flow direction of signal code Id with forcipated mutual-inductor and Portable Orientation Instrument and scurry into trouble point，Find the position of failure point that the position that signal code Id suddenly disappears is exactly exchange and scurries into；
nullDescribed monitoring main frame comprises voltage acquisition circuit、Signal Generator of Ultra-low Frequency、Cpu controller 1、Infrared transmitter、Display 1、Warner，Voltage acquisition circuit is by gathering alternating voltage amount UL、Busbar voltage amount Ud、Direct-flow positive pole voltage-to-ground U+、Direct current negative pole voltage-to-ground U-sends into cpu controller 1 after treatment，Cpu controller 1 is to alternating voltage amount UL、Busbar voltage amount Ud、Direct-flow positive pole voltage-to-ground U+、Direct current negative pole voltage-to-ground U-carries out calculating process，Start Signal Generator of Ultra-low Frequency and scurry into the ultra-low frequency signal electric current Id that extremely the earth is injected a 0.125Hz to exchange，Polarity is scurried in intelligent decision exchange、Mode also calculates resistance value and the value of signal code Id of equivalent resistance R，Alternating voltage amount UL is shown by display 1、Busbar voltage amount Ud、Direct-flow positive pole voltage-to-ground U+、Direct current negative pole voltage-to-ground U-、Equivalent resistance R and signal code Id value，Warner sends exchange and scurries into warning signal，Send equivalent resistance and signal code Id value by infrared emittance simultaneously；
Described Portable Orientation Instrument comprises current amplifier, 0.125Hz bandpass filter 2, phase comparator, A/D changer, cpu controller 2, infrared remote receiver, display 2, voice alarm, button, current amplifier is used for being amplified forcipated mutual-inductor sensing low current signal, the secondary output of its input termination forcipated mutual-inductor, the input of output termination 0.125Hz bandpass filter 2；0.125Hz bandpass filter 2 is used for extracting the current signal of 0.125Hz, the output of its input termination current amplifier, the input of output termination phase comparator；Phase comparator is used for the current signal of 0.125Hz is carried out phase bit comparison, it is judged that it is capacity current or current in resistance property, the output of its input termination 0.125Hz bandpass filter 2, the input of output termination A/D changer；A/D changer can be by the digital signal of cpu controller 2 identifying processing for the analog current signal of 0.125Hz is transformed into, the output of its input termination phase comparator, the I/O mouth of output termination cpu controller 2；Infrared remote receiver is used for receiving the infrared signal that monitoring main frame sends, and sends into cpu controller 2；Button is used for being operated Portable Orientation Instrument state control, there are communication button and detection button, communication button is pressed, cpu controller 2 starts infrared remote receiver and receives the infrared signal that monitoring main frame sends, realize signal to synchronize, detection button is pressed, cpu controller 2 reads A/D changer output signal, cpu controller 2 carries out calculating process to the digital quantity that A/D changer is sent into and the signal with infrared remote receiver reception carries out phase bit comparison, calculate equivalent resistance and signal code Id value, equivalent resistance and signal code Id value is shown by display 2, voice alarm sends warning signal；
Described forcipated mutual-inductor is used for the intrasonic current signal size that induction monitoring main frame sends, and uses passive high-precision AC transformer；
Described voltage acquisition circuit is made up of resistor voltage divider network, direct current sampling, exchange extraction, amplification filtering, signal condition 2, A/D conversion, resistor voltage divider network is used for alternating voltage and DC voltage are carried out pressure limiting, point two-way after pressure limiting, one tunnel gathers DC component, one tunnel gathers AC compounent, its input is connected on dc bus both positive and negative polarity, and output connects direct current sampling respectively and exchanges extraction；Direct current sampling is used for extracting DC component voltage U+ and U-, and its input connects the output of resistor voltage divider network, and output connects amplification filtering；Amplifying filtering to be used for filtering the AC compounent in DC component, its input connects the output of direct current sampling, and output connects A/D conversion；Exchange is extracted and is used for extracting the AC compounent voltage UL scurrying into direct current, and its input connects the output of resistor voltage divider network, and output connects signal condition 2；Signal condition 2 is used for converting AC compounent voltage so that it is becoming the semaphore that can be gathered by A/D conversion, its input connects the output that exchange is extracted, and output connects A/D conversion；A/D conversion gathers DC component voltage and AC compounent voltage simultaneously, and changes the digital signal amount that can be identified by cpu controller 1 into；
Described Signal Generator of Ultra-low Frequency is made up of cpu controller 3, D/A conversion, 0.125Hz bandpass filter 1, signal condition 1, power amplification, Capacitor apart, current-limiting resistor network, cpu controller 3 is used for producing the digital signal amount that frequency is 0.125Hz, and its output connects D/A conversion；The digital signal quantitative change that D/A conversion is used for cpu controller 3 to export changes analogue signal amount into, and its input connects the I/O mouth of cpu controller 3, and output connects the input of 0.125Hz bandpass filter 1；0.125Hz bandpass filter 1 is used for extracting the useful signal of 0.125Hz and filters remaining interference signal, and its input connects the output of D/A conversion, and output connects the input of signal condition 1；The signal condition 1 0.125Hz useful signal being used for extracting carries out waveform conditioning so that it is become symmetrical smooth sinusoidal wave form, and its input connects the output of 0.125Hz bandpass filter 1, and output connects the input of power amplification；Power amplification is used for amplifying the sinusoidal signal of signal condition 1 output, and its input connects the output of signal condition 1, and output connects Capacitor apart；Capacitor apart is used for isolated DC component, and its input connects the output of power amplification, and output connects the input of current-limiting resistor network；Current-limiting resistor network is used for 0.125Hz signal is carried out current-limiting protection, and its input connects the output of Capacitor apart, and output connects the both positive and negative polarity of direct current.
2. require that described a kind of straight-flow system exchange is scurried into localization of fault and searched device and method according to right 1, it is characterized in that, when there being exchange to scurry into direct current, value UL of the of ac scurried into measured by monitoring main frame, value Ud of DC voltage, positive pole voltage-to-ground value U+, negative pole voltage-to-ground value U-, intelligent decision exchange is scurried into polarity, mode and calculates equivalent resistance resistance value R, and scurries into the ultra-low frequency signal electric current Id that the earth extremely injects a 0.125Hz to exchange.
3. require that described a kind of straight-flow system exchange is scurried into localization of fault and searched device and method according to right 1, it is characterised in that the mode scurried into according to exchange, alternating current source is equivalent to resistance eutral grounding, and the exchange lookup scurried into a little both can regard the lookup of resistance eutral grounding point as.
4. require that described a kind of straight-flow system exchange is scurried into localization of fault and searched device and method according to right 1, it is characterised in that it is Tong Bu that Portable Orientation Instrument realizes signal with monitoring main frame by infrared signal transmitting and reception.
5. require that described a kind of straight-flow system exchange is scurried into localization of fault and searched device and method according to right 1, it is characterized in that, searching to exchange along the flow direction of signal code Id with forcipated mutual-inductor and Portable Orientation Instrument and scurry into trouble point, finding the position that signal code Id suddenly disappears is exactly the position of failure point that exchange is scurried into.
6. require that described a kind of straight-flow system exchange is scurried into localization of fault and searched device and method according to right 1, it is characterized in that, Signal Generator of Ultra-low Frequency is made up of cpu controller 3, D/A conversion, 0.125Hz bandpass filter 1, signal condition 1, power amplification, Capacitor apart, current-limiting resistor network, cpu controller 3 is used for producing the digital signal amount that frequency is 0.125Hz, and its output connects D/A conversion；The digital signal quantitative change that D/A conversion is used for cpu controller 3 to export changes analogue signal amount into, and its input connects the I/O mouth of cpu controller 3, and output connects the input of 0.125Hz bandpass filter 1；0.125Hz bandpass filter 1 is used for extracting the useful signal of 0.125Hz and filters remaining interference signal, and its input connects the output of D/A conversion, and output connects the input of signal condition 1；The signal condition 1 0.125Hz useful signal being used for extracting carries out waveform conditioning so that it is become symmetrical smooth sinusoidal wave form, and its input connects the output of 0.125Hz bandpass filter 1, and output connects the input of power amplification；Power amplification is used for amplifying the sinusoidal signal of signal condition 1 output, and its input connects the output of signal condition 1, and output connects Capacitor apart；Capacitor apart is used for isolated DC component, and its input connects the output of power amplification, and output connects the input of current-limiting resistor network；Current-limiting resistor network is used for 0.125Hz signal is carried out current-limiting protection, and its input connects the output of Capacitor apart, and output connects the both positive and negative polarity of direct current.
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| CN115308635A (en) * | 2021-05-05 | 2022-11-08 | 南京歌阳电力科技有限公司 | Power supply loop detection system and method for judging grounding polarity and direction thereof |
| CN113777525A (en) * | 2021-08-27 | 2021-12-10 | 广西电网有限责任公司北海供电局 | Short-time-break direct-current ground fault searching method and system |
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Effective date of registration: 20191227 Address after: 550002 NO.67, magic Road, Nanming District, Guiyang City, Guizhou Province Patentee after: Guiyang Xinguang Electric Co., Ltd. Address before: 550002 Guizhou Province, Guiyang city Nanming District Jade Factory Road Tongxin yuan A Building 2 unit 602 room Patentee before: Guiyang Yingnarui Electric Co. Ltd. |
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