CN104076243B - A kind of small current neutral grounding one-phase earthing failure in electric distribution network detection indicating means and equipment - Google Patents
A kind of small current neutral grounding one-phase earthing failure in electric distribution network detection indicating means and equipment Download PDFInfo
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Abstract
Country's power distribution networks such as China mainly use small current neutral grounding mode.Small current neutral grounding power distribution network major part fault is single-phase high-impedance, and the transient state capacitance current signal amplitude producing in failure process is low, the duration is short, and fault detect difficulty is high, lacks effective fault detect instruction equipment.The invention discloses fault detect indicating means and the feeder line monitoring means equipment of a kind of small current neutral grounding power distribution network.Feeder line monitoring means uses the electricity getting device with power control to power, using capacitive battery pressure sensor to gather voltage signal, electronic type current sensor gathers current signal, after doubtful earth fault being detected, wireless synchronization triggers other two-phase, transmits data by time division multiplexing wireless communication pattern.After converging the three-phase feeder line monitoring means data of multiple point on system main website platform software, make Earth Fault Detection according to the residual voltage calculating and zero-sequence current, issue feeder line monitoring means to fault phase before trouble point for the fault-signal and carry out indicating fault.
Description
Technical field
Present invention relates generally to the fault detect instruction of feeder automation part in power distribution automation, especially for little electricity
Stream ground connection one-phase earthing failure in electric distribution network detection, the method and apparatus of instruction.
Background technology
In power system, power supply is from power plant, and is sent to load side by high pressure or EHV transmission network, then
By electric pressure relatively low network, electric energy is assigned to the user of different electric pressure, this in power network, acts primarily as distribution electricity
The network that can act on is known as distribution network, is called for short power distribution network.In power system, power distribution network is to affect customer power supply reliability
Short slab.The investment relative deficiency of power distribution network, automatization level is low, is a very weak link, and countries in the world have this
Individual problem, in China, this problem is more prominent.According to the statistics of 2009, deduct short of electricity factor, current Chinese user
Power off time more than 95% all caused by power distribution network.
The common fault of power distribution network mainly has short trouble and earth fault.Short trouble includes that three-phase shortcircuit and two-phase are short
Road, earth fault common type is singlephase earth fault.For very ripe in the detection technique of short trouble, and for list
The detection of phase earth fault, especially for the singlephase earth fault of small current neutral grounding power distribution network, also lacks effective side at present
Method, is acknowledged as global problem.
The power distribution network of China and some countries mostly is small current neutral grounding power distribution network, and most faults are all single-phase earthing events
Barrier.Small current neutral grounding power distribution network major advantage is: do not form short-circuit loop during singlephase earth fault, only produces very little in system
Earth current, three-phase line voltage is still symmetrical, has no effect on the normal work of system.China Power code specifies, occurs single
During phase earth fault, small current neutral grounding power distribution network can continue to run with 1～2h by tape jam.So can improve the reliability of power supply,
It is widely used.
But after generation singlephase earth fault, it is necessary to find Single-phase Ground Connection Failure as early as possible, fix a breakdown.Otherwise ground connection event
The overvoltage that barrier produces, the power system accident such as electric cable explosion, voltage transformer pt can be caused to burn, bus burns.Simultaneously
If ground path is as regular link longtime running, bring great hidden danger can to local resident, safety of livestock.2010,
There is distribution overhead line single-phase high resistance ground longtime running in Hechi City, Guangxi, causes the person to be got an electric shock and died accident.This type of is pernicious
Accident case happens occasionally, and has greatly threatened power grid security production.
The earthing mode of small current neutral grounding power distribution network is mainly earth-free and through grounding through arc.According to DL/T620-
1997 " overvoltage protection of alternating-current electric device and Insulation Coordination ", mix with cable to pure overhead transmission line or trolley line and to constitute
10kV distribution, if capacitance current during earth fault is less than 10A, can use earth-free mode, but when capacitance current is big
It in 10A, is necessary for installing arc suppression coil.
Power distribution network uses isolated neutral or through grounding through arc mode, when there is singlephase earth fault,
A, B, C three-phase will not produce big fault current, below divide both of these case to describe in detail:
1 power distribution network uses isolated neutral mode
When power network neutral point N is earth-free, when in the phase in A, B, C three-phase, such as A phase, certain point is grounded, such as Fig. 1
Shown in.In the fault initial period, the voltage of fault phase A phase will fall rapidly, and the voltage of healthy phases B phase and C phase is incited somebody to action on rapidly
Rise, neutral point voltage also rises rapidly, and now A phase feeder line distribution capacity over the ground will be discharged rapidly over the ground by earth point, B phase and
C phase feeder line distribution capacity over the ground will be charged rapidly over the ground by earth point, formed an of short duration charge and discharge process (10ms～
20ms), bigger transient state capacitance current is produced.System will enter stable state subsequently, power supply by healthy phases distribution capacity, connect
Place, produces a lasting stable state capacitance current.In the process, transient state capacitance current is much larger than stable state capacitance current.
The electric current of three-phase line is directly added, it is possible to obtain the zero-sequence current of circuit.In like manner, the voltage of three-phase line is straight
Connect addition, the residual voltage of circuit can be obtained.In this process, the zero-sequence current of faulty line is as shown in Figure 2.Ground connection event
Before barrier occurs, the zero-sequence current of circuit is very little, is approximately 0, when earth fault occurs, first occurs that electric capacity charge and discharge
Electricity transient process, produces bigger high frequency transient capacitance current, subsequently one main energetic of maintenance concentrate on power frequency (50Hz or
Stable state capacitance current 60Hz).
2 power distribution networks use neutral by arc extinction coil grounding mode
When power network neutral point N is through grounding through arc, when in the phase in A, B, C three-phase, such as A phase, certain point connects
Ground, as shown in Figure 3.Similar with earth-free, in the fault initial period, the voltage of fault phase A phase will fall rapidly, healthy phases B
To rise rapidly with the voltage of C phase mutually, neutral point voltage also rises rapidly, and now A phase feeder line distribution capacity over the ground will be by connecing
Discharging rapidly over the ground in place, B phase and C phase feeder line distribution capacity over the ground will be charged rapidly over the ground by earth point, formed one short
Temporary charge and discharge process (10ms～20ms), produces bigger transient state capacitance current.Arc suppression coil L will produce one subsequently
Compensating electric current, compensating the stable state capacitance current that power supply is produced by healthy phases distribution capacity, earth point, system enters steady subsequently
State.Use neutral point N will become very little through grounding through arc mode, the stable state capacitance current on faulty line, will not produce
Raw bigger stable status zero-sequence current as shown in Figure 2, but the transient state capacitance current on faulty line is unaffected.
Small current neutral grounding is particularly through the singlephase earth fault of grounding through arc power distribution network, when transient fault electric current continues
Between very short, stable fault currents is very little, and adds up and show, the earth resistance of most singlephase earth faults is more than 800 Ω,
Belonging to high resistance ground, as through branch, through meadow, through ground connection such as moist walls, transient fault electric current at this moment is also little, when continuing
Between very short again, only 10～20ms.Thus the detection of small current neutral grounding one-phase earthing failure in electric distribution network and positioning, it is recognized that it is the world
Property a difficult problem, primarily now have following several for small current neutral grounding one-phase earthing failure in electric distribution network detection method and apparatus:
1 carries out small current line selection and device thereof in transformer station
Existing Small Electric Current Earthing And Routing Device, can select in the outlet of substation bus bar, and which bar circuit there occurs
Earth fault.As a example by Fig. 1 and Fig. 3, substation bus bar has 2 outlets, and one is faulty line, and another is faulty line,
Small Electric Current Earthing And Routing Device, can select faulty line therein.
Small Electric Current Earthing And Routing Device is by gathering the zero sequence electricity of the residual voltage on substation bus bar and each branch line
Stream, uses raising as earthing wire-selecting trigger condition suddenly of residual voltage, recycles the stable state of each branch line zero-sequence current
Information and transient information, select faulty line.Use information different according to it, be segmented into stable state line selection apparatus and transient state route selection
Device.
Stable state line selection apparatus route selection foundation mainly has:
(1) the zero-sequence current amplitude of faulty line is maximum；
(2) zero-sequence current phase place and the non-fault line of faulty line are anti-phase；
(3) the zero sequence reactive power of faulty line is negative；
(4) zero sequence active power of faulty line is big；
(5) 5 subharmonic currents of faulty line are big and anti-phase with non-fault line；
(6) negative-sequence current of faulty line is big.
Transient state line selection apparatus route selection foundation mainly has:
(1) transient zero-sequence current when phase voltage reaches maximum of faulty line and non-fault line and the first half-wave of voltage
Amplitude is all different from phase place；
(2) use the zero-sequence current transient information feature that other processing methods such as small echo extracts, and coordinate artificial intelligence
As neutral net carries out the identification of faulty line and non-fault line.
The major defect of Small Electric Current Earthing And Routing Device is:
(1) existing PT and CT of transformer station is used to affect route selection reliability and accuracy
PT that must in parallel on bus as the bus residual voltage of Small Electric Current Earthing And Routing Device trigger
Obtain, the ferromagnetic resonance of PT can to route selection cause larger interference.
Owing to special zero sequence CT volume is big, cost is high, and needing the installation that has a power failure, Small Electric Current Earthing And Routing Device obtains zero
Sequence electric current is frequently not and is obtained by special zero sequence CT, but is obtained by the existing three-phase of transformer station or two-phase measurement CT.Preferable
CT, there is no a number of ampere turns numerically equal of excitation loss electric current, primary winding and secondary coil, once survey electric current and secondary
Survey current phase is identical and does not has phase offset., there is exciting current in the CT of actual application, thus primary winding and secondary coil
Number of ampere turns unequal, the phase place of primary current and secondary current also and differs.Therefore, actual CT generally has in phase place
Angular error and variation error, cause three-phase CT uneven, the zero-sequence current being obtained by three-phase CT superposition have uneven electricity
Flow, and actual zero-sequence current exists error, affects route selection result.Additionally traditional measurement CT, owing to there being magnetic core, encouraging of magnetic core
Magnetic characteristic is nonlinear, electric current linearity when impact is from small area analysis to big electric current；And magnetic core is when electric current is big, can go out
Existing magnetic saturation problem, can cause CT saturated, and in actual applications, Medial & Low Voltage Power Network occurs CT saturated phenomenon often, now cannot
Obtain correct zero-sequence current and carry out route selection；There is energy storage link and hysteresis element in magnetic core, this makes CT transient characterisitics bad, right
Following of current break is bad, it is difficult to the accurately faint transient signal of capture.
(2) position of earth fault can not be accurately positioned
Small current earthing wire-selecting can be only installed at power distribution network bus separated time, be only used for selecting occur earth fault point
Branch line, and the position that earth fault occurs in branch line can not be positioned.
2 signal injection method and device thereof
Signal injection method uses Injection Signal source method to coordinate fault detector can detect the permanent of the big earth current of positioning
Earth fault.The principle of the method is: after transformer station detects that residual voltage significantly rises and continues for some time, zero sequence
After electric current is more than threshold value and continues for some time, it can be determined that go out to there occurs earth fault, need to put into arc suppression coil, now
Neutral point at main transformer injects the fault-current signal of certain pattern, the fault detector before earth fault
This signal being detected and to provide instruction, and the fault detector after earth fault all cannot detect this signal not
Meeting action, such that it is able to identify the position that earth fault occurs.
As shown in Figure 4, ground signalling source substation grounding transformer neutral point over the ground between access controlled resistive
Load (middle resistance, usually more than 100 ohm).During fault, under microcomputer control, on the neutral point of substation grounding transformer
The resistive load signal source of (no ground transformer can be connected on bus neutral point constantly) puts into automatically in short-term, thus in transformer station
And produce special little coding signal code between the earth point of scene.Volume by the resistive load switching to ground signalling source
Code control, can produce the code current signal being superimposed upon on load current.Transformer station's outlet and line branch point are installed everywhere
Earth-fault indicator, auto-action instruction after this current signal detected, reach to indicate the purpose of fault.
Injection Signal source method has the drawback that
(1) need in transformer station's reload signal source, change system operation mode；
(2) signal source and other equipment need additional investment and construction, need to have a power failure in work progress；
(3) for earth fault more than 800 ohm for the common earth resistance, it is impossible to produce sufficiently large coding signal
Electric current makes fault detector action, it is impossible to detection high resistance earthing fault；
(4) transient earthing fault cannot be detected.
3 based on networking distribution detection terminal FTU Earth Fault Detection localization method
Based on networking FTU Earth Fault Detection localization method as it is shown in figure 5, the method is by peace near switch on the line
Dress and switch supporting distribution detection terminal FTU, three-phase current when recording fault, voltage waveform data, and data are sent out
Deliver to distribution automation main website to be analyzed, the switch section at localization of faults place.
It based on the major defect of networking FTU Earth Fault Detection localization method is:
(1) need to install switch, and switch internal is it is necessary to have CT and PT, switch and FTU investment are very huge；
(2) measuring CT to defy capture small area analysis transient signal, big electric current can saturated, three superimposed when generate zero sequence by
Bigger error can be caused in three-phase imbalance, detection is difficult to high resistance ground；
(3) PT has ferromagnetic resonance problem；
(4) switch is installed and FTU needs line outage to construct；
(5) section between switch can only be navigated to, it is impossible to accomplish to position more accurately；
(6) provide power supply extremely difficult for FTU on trolley line, affect it and install and normal work.
At present, small current neutral grounding system, particularly neutral by arc extinction coil grounding system, lack effective earth fault
Detection method and equipment, it is impossible to quickly detect out earth fault, indicate earthing position.A lot of power supply departments are still using bracing wire
Methods etc. manually investigate legal position earth fault, and these method automaticities are very low, performance difficulty, inefficiency, it is impossible to meet
Power system continues to improve the requirement of power supply reliability, is just becoming the main difficulty improved the quality of power supply, improve power supply reliability
One of.In order to improve small current neutral grounding distribution network reliability, it is necessary to provide a kind of method and apparatus, in small current neutral grounding
After power distribution network generation singlephase earth fault, whether low-impedance earthed system or high resistance ground, transient fault or permanent fault, all may be used
Effectively to detect and to indicate.
Content of the invention
The invention provides the detection of a kind of small current neutral grounding one-phase earthing failure in electric distribution network, the method and apparatus of instruction.
According to one aspect of the present invention, the invention discloses a kind of small current neutral grounding one-phase earthing failure in electric distribution network inspection
The method surveyed, indicate, comprising:
(1) main power source from distribution feeder power taking and also power taking is power-controlled, battery is as stand-by power supply, as long as joining
Electrical network does not have a power failure, it is possible to persistently obtain the power supply of work；
(2) by each phase voltage of capacitive battery pressure sensor pickup；
(3) each phase current is picked up by electronic type current sensor；
(4) carry out baseband processing by each phase voltage signal, obtain transient voltage signal, extract transient voltage signal
Amplitude, mean value, differential value, integrated value and combinations thereof, when the threshold value that varies more than of one or more in above-mentioned value, trigger and doubt
Report to the police like earth fault；
(5) carry out baseband processing by each phase current signal, obtain transient current signal, extract transient current signal
Amplitude, mean value, differential value, integrated value and combinations thereof, when the threshold value that varies more than of one or more in above-mentioned value, trigger and doubt
Report to the police like earth fault；
(6) doubtful earth fault phase wireless synchronization triggers other phases, notifies that other phases upload voltage, current waveform data；
(7) each phase uses time-multiplexed communication, it is ensured that real time bidirectional communication, passes through communication
Converge three-phase voltage, current waveform data；
(8) when each phase is by wireless pair, it is achieved and other phase time synchronized；
(9) three-phase voltage according to multiple positions, current waveform data, calculates residual voltage, zero-sequence current connects
Earth fault detects, and after detecting earth fault, issues earth-fault signal, carries out on fault phase before earth fault
Earth fault indicates.
According to another aspect of the present invention, the invention discloses a kind of small current neutral grounding one-phase earthing failure in electric distribution network inspection
The equipment feeder line monitoring means surveyed, indicate, comprising:
(1) feeder line clamping device, is made up of cliping line spring, line torr, blocking mechanism, damping mechanism；
(2) electricity getting device with power control, for getting the power supply of enough systems work from distribution feeder；
(3) electric power controller, for carrying out Power convert and switching to electricity getting device and backup battery；
(4) voltage, temperature integrated transducer, for pick-up voltage signal, feeder line temperature signal from distribution feeder；
(5) electronic type current sensor, for picking up current signal from distribution feeder；
(6) wireless synchronization triggers device, uploads voltage, current waveform data for other phases of trigger notice, it is possible to auxiliary
When helping pair；
(7) radio communication device, uses time-multiplexed communication pattern, and outside carries out data transmission, it is possible to synchronization
Pair when；
(8) with electricity getting device, electric power controller, voltage, temperature integrated transducer, electronic type current sensor, nothing
The processing means that line communicator, wireless synchronization trigger device, accident indicator is connected, is used for controlling power taking, power supply switching,
Gather various voltage, electric current, temperature, wireless synchronization trigger, voltage, current signal processed, carry out radio communication,
Retention time synchronizes, and receives a distant place and transmits the data of coming, carries out indicating fault；
(9) accident indicator, uses wide-angle high-brightness light emitting diode, uses different frequency and different flash lamp mode to indicate not
Same fault.
Brief description
Fig. 1 shows neutral point N earth-free one-phase earthing failure in electric distribution network electric current.
Fig. 2 shows faulty line zero-sequence current after singlephase earth fault generation.
Fig. 3 shows neutral point N through grounding through arc one-phase earthing failure in electric distribution network electric current.
Fig. 4 shows Injection Signal source method Earth Fault Detection principle.
Fig. 5 shows based on networking FTU earth-fault detecting method principle.
Fig. 6 A, Fig. 6 B, Fig. 6 C, Fig. 6 D show the Method And Principle of the present invention.Fig. 6 A shows generation singlephase earth fault
When, fault phase distribution feeder monitoring means monitors short time voltage, electric current acute variation.Fig. 6 B shows fault phase power distribution network
After feeder line monitoring means detects doubtful earth fault, trigger other phase feeder line monitoring means by wireless synchronization.Fig. 6 C shows
Three-phase distribution net feeder line monitoring means passes through wireless communication transmissions voltage, current waveform data, by three-phase feeder line monitoring means
Voltage, current waveform data converges to communication terminal, then is uploaded to system main website.Fig. 6 D shows, the platform of system main website
Software, after making Earth Fault Detection, issues feeder line monitoring to distribution network failure phase before trouble point for the earth-fault signal
Unit indicates.
Fig. 7 A, Fig. 7 B, Fig. 7 C show the wireless synchronization triggering mode of the present invention.Fig. 7 A is shown that triggering B when A is identical
Phase, C phase；Fig. 7 B is shown that A phase and first triggers B phase, and B phase triggers C phase again；Fig. 7 C is shown that A phase and first triggers communication terminal, logical
Letter terminal triggers B phase, C phase again
Fig. 8 shows the equipment feeder line monitoring means building according to one embodiment of the present of invention, and equipment is in feeder clip
Hold mechanism opening state to be installed.
Fig. 9 shows the equipment feeder line monitoring means building according to one embodiment of the present of invention, is in feeder line clamping machine
The state of structure locking.
Figure 10 shows the system architecture of the equipment feeder line monitoring means building according to one embodiment of the present of invention.
Figure 11 shows the accident indicator of the equipment feeder line monitoring means building according to one embodiment of the present of invention.
Detailed description of the invention
Fig. 6 shows the Method And Principle of the present invention.
Fig. 6 A shows, after small current neutral grounding distribution feeder a certain phase generation singlephase earth fault, in earth fault
In transient process, the both sides voltage and current of earth point is within a very short time, it may occur that acute variation, produces abnormal temporary
State voltage signal and current signal.Feeder line monitoring means disclosed by the invention uses capacitive battery pressure sensor, does not haves PT
Ferromagnetic resonance problem, can reliably pick up transient voltage signal.Feeder line monitoring means disclosed by the invention uses electronics
Formula current sensor, good to precision height, the linearity of current measurement, the measurement to small area analysis and big electric current can have very high
Precision, big electric current is unsaturated, and transient characterisitics are good, can reliably pick up transient current signal.At small current neutral grounding power distribution network
During single-phase earth fault transient, fault phase distribution feeder monitoring means passes through capacitive battery pressure sensor and electronic type electricity
Flow sensor, can monitor transient voltage signal, transient current signal extremely.
Fig. 6 B shows, after distribution network failure phase feeder line monitoring means detects doubtful earth fault, passes through wireless synchronization
Trigger other phase feeder line monitoring means and upload voltage, the current waveform data monitoring.
Fig. 6 C shows, three-phase distribution net feeder line monitoring means passes through wireless communication transmissions voltage, current waveform data, will
The voltage of three-phase feeder line monitoring means, current waveform data converge to communication terminal, it is also possible to by two-phase feeder line monitoring means
Voltage, current waveform data converge to a three-phase feeder line monitoring means phase therein, will by communication terminal or feeder line monitoring means
Voltage, current waveform data upload to the platform software of system main website.
Fig. 6 D shows, the platform software of system main website is obtaining the three-phase distribution net feeder line monitoring means electricity of multiple position
After pressure, current waveform data, the residual voltage of the multiple positions that can calculate, zero-sequence current waveform, and according to zero sequence electricity
Pressure, zero-sequence current wave character, make Earth Fault Detection, issue earth-fault signal to distribution network failure phase trouble point it
Front feeder line monitoring means indicates.
After a certain phase feeder line monitoring means monitors doubtful earth fault, need to notify rapidly to conduct electricity in other two-phase
Pressure, current waveform data, by three-phase voltage, current waveform data, obtain residual voltage and zero sequence current signal, enter traveling one
The earth fault of step judges.The wireless synchronization of the feeder line monitoring means that the present invention proposes triggers device, it is possible to use infrared ray, sound
Any one of sound, ultrasonic wave, magnetic field, electromagnetic field or combination, as trigger, send to other two-phase.Feeder line prison simultaneously
Survey unit wireless synchronous triggering device and can also receive wireless synchronization trigger.Wireless synchronization triggers pattern to be had several as follows:
(1) as shown in Figure 7 A, it is assumed that A phase feeder line monitoring means monitors doubtful earth fault, and A phase feeder line monitoring means is just
Triggering device by wireless synchronization, wireless synchronization triggers B phase feeder line monitoring means and C phase feeder line monitoring means；
(2) as shown in Figure 7 B, it is assumed that A phase feeder line monitoring means monitors doubtful earth fault, and A phase feeder line monitoring means is just
Triggering device by wireless synchronization, wireless synchronization triggers B phase feeder line monitoring means, and B phase feeder line monitoring means is wireless same more subsequently
Step triggers C phase feeder line monitoring means；
(3) as seen in figure 7 c, it is assumed that A phase feeder line monitoring means monitors doubtful earth fault, and A phase feeder line monitoring means is just
Triggering device by wireless synchronization, wireless synchronization triggers communication terminal, and it is single that communication terminal wireless synchronization again triggers the monitoring of B phase feeder line
Unit and C phase feeder line monitoring means.
Fig. 8 shows the equipment 100 building according to one embodiment of the present of invention, i.e. feeder line monitoring means, at equipment 100
In the state that feeder line clamping mechanism opening is to be installed.The housing of equipment 100 is by upper arm the 101st, main body the 104th, transparent lower house 105 groups
Become.Upper arm 101 is made up of two halves 102 and 103, and 102 built with the part of electronic type current sensor, and 103 built with power taking
A part for device.The electricity getting device remainder of equipment, electric power controller, electronic type current sensor remainder, nothing
Line locking triggering device, radio communication device, processing means, accident indicator are positioned at main body 104, accident indicator
The light that indication LED sends is emitted by transparent lower house 105.All device casting glues will all be potted in main body 104
In.
The electricity getting device core of equipment 100 is a magnetic element with closed magnetic circuit, as annular or other there is class
Like the magnetic element of closed magnetic circuit, this closed magnetic circuit surrounds distribution feeder 106, and this magnetic element is cut into two parts, and one
Part is positioned at upper arm 103, and a part is positioned at main body 104.Being wound with the coil of power taking on magnetic element, this coil connects work(
Rate control circuit.In order to allow electricity getting device flow on distribution feeder 106 overcurrent very little when just can get enough
Power supply, two parts magnetic element passes through blocking device, it is achieved magnetic circuit tight close, and blocking device is by being positioned at upper arm axle 116
The pressing spring of case spring, damper and the magnetic element being positioned at upper arm 103 forms, and case spring makes upper arm and main body
Being in close contact, damper can slow down impulsive force in latching process for the upper arm, the magnetic element in upper arm 103 and main body 104
Interior magnetic element is again by being realized being in close contact by pressing spring.
Traditional electricity getting device, if the electric current flowing through on distribution feeder 106 is less, can get enough equipment
During the power supply that 100 work, then when the electric current flowing through on distribution feeder 106 is very big, magnetic element will be saturated, and takes not
To electricity；If the electric current flowing through on distribution feeder 106 is very big, magnetic element is unsaturated, then at distribution feeder 106
On the electric current that flows through less when, the power supply of enough equipment 100 work cannot be got.The present invention is permissible by power control circuit
When electric current that magnetic element is flow through on distribution feeder 106 is less, the power supply of enough equipment 100 work can be got, when
When the electric current flowing through on distribution feeder 106 is very big, power control circuit can make magnetic element unsaturated, remains able to get
The power supply of enough equipment 100 work.
The power supply that electricity getting device is obtained by equipment 100 electric power controller, is converted into system working power, when power distribution network feedback
In the case that line has a power failure and electricity getting device power supply cannot be powered, automatically switch to backup battery and power, when electricity getting device power supply
In the case of can powering, automatically switch to electricity getting device and power.
Equipment 100 is by voltage, temperature integrated transducer 117 pick-up voltage and temperature signal, and sensor 117 is by stainless
Steel is made, and distribution feeder is in close contact, and has good conduction, thermal conduction characteristic, can pick up the voltage signal on feeder line,
Simultaneously also can be by the heat transfer on feeder line to temperature-sensitive element.
Equipment 100 picks up current signal by electronic type current sensor, and electronic type current sensor can be that electric current is mutual
Sensor CT, can be current transformer, it is also possible to be Wound-rotor type Luo-coil, it is also possible to be the board-like Luo-coil of printed circuit,
A part for electronic type current sensor measurement magnetic circuit is positioned at upper arm 102, and another part is positioned at main body 104.
Equipment 100 passes through feeder line clamping device, is installed on feeder line, can use Luo-coil electronic current simultaneously
In the case of sensor, feeder line is allowed to be in Luo-coil magnetic circuit center.The feeder line clamping device of equipment 100 is by 4 card lines
Spring the 107th, the 108th, the 109th, the spring catch of 110,4 fixing cliping line springs the 111st, the 112nd, the 113rd, 114, and line torr 115 forms.
Fig. 9 shows the equipment 100 feeder line monitoring means building according to one embodiment of the present of invention, is in feeder line clamping
The state of mechanism's locking.In the lockout condition, feeder line accommodates 4 springs of device and the 107th, the 108th, the 109th, 110 staggered holds feeder line tightly
106, by fixing for feeder line 106 online torr 115, two parts magnetic element of electricity getting device realizes fitting tightly, and feeder line 106 is positioned at
The center of electronic type current sensor closed magnetic circuit.Voltage, temperature integrated transducer 117 and distribution feeder 106 achieve
Fit tightly.
According to one embodiment of the present of invention build equipment 100 feeder line monitoring means system architecture as shown in Figure 10.
Being wound with electricity taking coil 202 on power taking magnetic element 201, feeder line 212 is positioned at magnetic element magnetic circuit center, and electricity taking coil 202 accesses
Output control device 203, the power control circuit 203 of battery 204 and electricity getting device accesses electric power controller 205.Power supply pipe
Power control circuit 203 out-put supply of reason 205 electricity getting devices of device and battery 204 are converted into power supply needed for equipment 100, with
When between power control circuit 203 and battery 204 switch.
Processing means 208 gathers voltage, the voltage signal of temperature integrated transducer 206 pickup, carries out voltage signal
Baseband processing, obtains transient voltage signal, extracts amplitude, mean value, differential value, integrated value and the group thereof of transient voltage signal
Close, vary more than threshold value when one or more in above-mentioned value, trigger doubtful earth fault and report to the police.
Processing means 208 gathers the current signal of electronic type current sensor 207 pickup, carries out to current signal carrying logical place
Reason, obtains transient current signal, extracts the amplitude of transient current signal, mean value, differential value, integrated value and combinations thereof, when upper
State in value one or more vary more than threshold value, trigger doubtful earth fault report to the police.
Processing means 208, after triggering doubtful earth fault and reporting to the police, triggers device 210 by wireless synchronization immediately and triggers
The feeder line monitoring means equipment 100 of other phases.
Processing means 208 carries out radio communication by radio communication device 209 and the time-multiplexed mode of outside employing, and
When being synchronized pair, it is ensured that the feeder line monitoring means equipment 100 retention time synchronization of arbitrary phase equipment 100 and other phases.
Accident indicator such as Figure 11 institute according to the equipment 100 feeder line monitoring means that one embodiment of the present of invention builds
Show.Accident indicator, use 3 wide-angle high-brightness light emitting diodes the 301st, the 302nd, 303,120 degree be equidistantly spaced from, connect receiving
After earth fault signal, use different frequency and the different earth fault of different flash pattern instruction.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with scope of the claims.
Claims (10)
1. the detection of small current neutral grounding one-phase earthing failure in electric distribution network, the method for instruction, it is characterised in that include:
(1) main power source from distribution feeder power taking and also power taking is power-controlled, battery is as stand-by power supply, if power distribution network
Do not have a power failure, it is possible to persistently obtain the power supply of work；
(2) by each phase voltage of capacitive battery pressure sensor pickup；
(3) each phase current is picked up by electronic type current sensor；
(4) carry out baseband processing by each phase voltage signal, obtain transient voltage signal, extract the width of transient voltage signal
Value, mean value, differential value, integrated value and combinations thereof, vary more than threshold value when one or more in above-mentioned value, triggers doubtful
Earth fault is reported to the police；
(5) carry out baseband processing by each phase current signal, obtain transient current signal, extract the width of transient current signal
Value, mean value, differential value, integrated value and combinations thereof, vary more than threshold value when one or more in above-mentioned value, triggers doubtful
Earth fault is reported to the police；
(6) doubtful earth fault phase wireless synchronization triggers other phases, notifies that other phases upload voltage, current waveform data；
(7) each phase uses time-multiplexed communication, it is ensured that real time bidirectional communication, is converged by communication
Three-phase voltage, current waveform data；
(8) when each phase is by wireless pair, it is achieved and other phase time synchronized；
(9) three-phase voltage according to multiple positions, current waveform data, calculate residual voltage, zero-sequence current carry out ground connection therefore
Earth-fault signal after detecting earth fault, is issued, is grounded on fault phase before earth fault by barrier detection
Indicating fault.
2. one kind based on method as claimed in claim 1 small current neutral grounding one-phase earthing failure in electric distribution network detection, instruction set
Standby, it is characterised in that to include:
(1) feeder line clamping device, is made up of cliping line spring, line torr, blocking mechanism, damping mechanism；
(2) electricity getting device with power control, for getting the power supply of enough systems work from distribution feeder；
(3) electric power controller, for carrying out Power convert and switching to electricity getting device and backup battery；
(4) voltage, temperature integrated transducer, for pick-up voltage signal, feeder line temperature signal from distribution feeder；
(5) electronic type current sensor, for picking up current signal from distribution feeder；
(6) wireless synchronization triggers device, uploads voltage, current waveform data for other phases of trigger notice, it is possible to it is right to assist
When；
(7) radio communication device, uses time-multiplexed communication pattern, and outside carries out data transmission, it is possible to during synchronization pair；
(8) with electricity getting device, electric power controller, voltage, temperature integrated transducer, electronic type current sensor, channel radio
The processing means that T unit, wireless synchronization trigger device, accident indicator is connected, is used for controlling power taking, and power supply switches, and gathers
Various voltages, electric current, temperature, wireless synchronization trigger, processed to voltage, current signal, carries out radio communication, keeps
Time synchronized, receives a distant place and transmits the data of coming, carry out indicating fault；
(9) accident indicator, uses wide-angle high-brightness light emitting diode, employing different frequency and the different event of different flash lamp modes instruction
Barrier.
3. equipment according to claim 2, it is characterised in that: described equipment body is made up of three parts, top half, master
Body, transparent shell, top half and body envelopes need the feeder line of clamping, have by cliping line spring, line torr, breech-block in main body
Structure, the feeder line clamping device of damping mechanism composition, by between online for feeder line clamping torr and cliping line spring, regulate feeder line by line torr
The optional position being between top half and main body, top half passes through blocking mechanism and main body tight closure, by damping machine
Structure slows down speed and the reduction impulsive force of latching process.
4. equipment according to claim 3, it is characterised in that: described equipment is powered and is depended on electricity getting device, battery
As backup, described electricity getting device core is a magnetisable material with closed magnetic circuit, is split into two halves, lays respectively at equipment
In top half and main body, being realized the tight closure of magnetic circuit by blocking mechanism, blocking mechanism is by being positioned at first half split axle
Case spring or other types elastic mechanism, damper and be positioned at top half magnetic element by pressing spring or other classes
Type elastic mechanism forms, and electricity getting device band power controls, and can control from feeder line power taking power, it is ensured that when feeder line flows through small area analysis
Just can get the power of enough work, will not be saturated or power taking can be continued during feeder line stream super-high-current.
5. equipment according to claim 3, it is characterised in that: described equipment uses voltage, temperature integrated transducer to pick up
Taking voltage signal, electronic type current sensor picks up current signal, and electronic type current sensor is current transformer or Wound-rotor type
Luo-coil or the board-like Luo-coil of printed circuit, electronic type current sensor is divided into two parts, lays respectively at the upper half of equipment
In part and main body.
6. equipment according to claim 2, it is characterised in that: the voltage signal to pickup for the described equipment carries out carrying logical place
Reason, obtains transient voltage signal, and extraction carries the amplitude of voltage signal after leading to, mean value, differential value, integrated value and combinations thereof,
Vary more than threshold value when one or more in above-mentioned value, trigger doubtful earth fault and report to the police.
7. equipment according to claim 2, it is characterised in that: the current signal to pickup for the described equipment carries out carrying logical place
Reason, obtains transient current signal, extracts the amplitude of transient current signal, mean value, differential value, integrated value and combinations thereof, when upper
State in value one or more vary more than threshold value, trigger doubtful earth fault report to the police.
8. equipment according to claim 2, it is characterised in that: described equipment reports to the police it in the doubtful earth fault phase of generation
After, triggering device by wireless synchronization and trigger other two-phase, described wireless synchronization triggers device and uses infrared ray, sound, ultrasonic
Ripple, magnetic field, electromagnetic field, as trigger, are conveyed directly to remaining two-phase, or are transferred first to an adjacent phase, again by phase
Adjacent deliver to the other phase in three-phase according to legend, or be transferred first to adjacent radio communication device, again by radio communication device
Remaining two-phase being sent in three-phase, notifies that remaining two-phase uploads voltage, current waveform data, is used for calculating residual voltage and zero
Sequence current signal detects earth fault, and the device of wireless synchronization triggering simultaneously can also carry out carrying out between different described equipment
During synchronization pair.
9. equipment according to claim 2, it is characterised in that: the channel radio by time division multiplex mode of operation for the described equipment
T unit and external equipment carry out data transmission, and described equipment passes through time division multiplex fault mode, can set described in different
When being synchronized between Bei pair.
10. equipment according to claim 2, it is characterised in that: described equipment is to arrive the earth fault that a distant place is transmitted
Indicating after confirmation signal, the accident indicator that described equipment uses uses wide-angle high-brightness light emitting diode again,
Can ensure that the omnirange instruction of maximum hemispherical area 360 degree, the accident indicator of described equipment is by different number of diodes
Purpose combination, blinking intervals and flicker frequency are used to refer to different types of fault.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310106380.2A CN104076243B (en) | 2013-03-29 | 2013-03-29 | A kind of small current neutral grounding one-phase earthing failure in electric distribution network detection indicating means and equipment |
| PCT/CN2014/074206 WO2014154164A1 (en) | 2013-03-29 | 2014-03-27 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| US14/774,123 US10222409B2 (en) | 2013-03-29 | 2014-03-27 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| RS20220345A RS63098B1 (en) | 2013-03-29 | 2014-03-27 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
| EP14772927.1A EP2985613B1 (en) | 2013-03-29 | 2014-03-27 | Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network |
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|---|---|---|---|
| CN201310106380.2A CN104076243B (en) | 2013-03-29 | 2013-03-29 | A kind of small current neutral grounding one-phase earthing failure in electric distribution network detection indicating means and equipment |
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| CN104076243A CN104076243A (en) | 2014-10-01 |
| CN104076243B true CN104076243B (en) | 2016-11-09 |
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