CN1508554A - Single-phase earthing failure line-selecting method for small-current earthing system - Google Patents
Single-phase earthing failure line-selecting method for small-current earthing system Download PDFInfo
- Publication number
- CN1508554A CN1508554A CNA2003101173599A CN200310117359A CN1508554A CN 1508554 A CN1508554 A CN 1508554A CN A2003101173599 A CNA2003101173599 A CN A2003101173599A CN 200310117359 A CN200310117359 A CN 200310117359A CN 1508554 A CN1508554 A CN 1508554A
- Authority
- CN
- China
- Prior art keywords
- current
- line
- circuit
- phase
- fault
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001052 transient effect Effects 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 2
- 230000007257 malfunction Effects 0.000 abstract 1
- 230000007935 neutral effect Effects 0.000 description 13
- 238000012545 processing Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010187 selection method Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Landscapes
- Locating Faults (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention belongs to electricity system field. It refers to accident selecting method and device for small current earth system. The method is: detect and record the current traveling wave on each loop at the same bus, the one with the biggest traveling wave values, the converse polar to other loop is the malfunction loop. The device is: the converter, data collecting circuit, centre processor, result output interface circuit, displaying circuit and power in order on the circuit base board.
Description
The application is one and divides an application that the denomination of invention of original application case is: low current neutral grounding system fault route selecting method and device application number are: the 01118471.X applying date is: June 1 calendar year 2001
Technical field the invention belongs to field of power, and particularly the singlephase earth fault circuit of small current neutral grounding system is selected technology and device in the electric system.
During background technology small current neutral grounding system generation singlephase earth fault, because the not direct ground connection of neutral point, so, can not form short-circuit loop, therefore there is not short-circuit current, have only the little capacitance current of numerical value to flow to the trouble spot.This is an objective phenomenon.
Although do not form short-circuit loop, the fault ground electric current is also little,, this situation can not long-term existence.Non-fault phase voltage can raise on the one hand, and line insulation is threatened; The flame current of earth point can burn out circuit on the other hand, causes the circuit permanent damages.So China Power operating standard regulation: the single-phase earthing duration must not surpass 2 hours, and faulty line must withdraw from from electrical network.Therefore, being this problem of ground path with regard to having proposed that circuit---fault wire is selected problem.
Around this problem, various countries have carried out countless research, have also developed many method and apparatus.For example use the fault-line selecting method of zero sequence power current.Because power frequency zero-sequence current numerical value is very little, the uneven zero-sequence current when being difficult to normal operation is distinguished mutually, so can't correctly select fault wire.Its root problem is to have used the power frequency electric parameters.Cause not having up to now a kind of method or device fundamentally to solve the low current grounding circuit and select problem.
Summary of the invention the objective of the invention is to propose a kind of fault-line selecting method of single-phase earthing of small current earthing system for overcoming the weak point of prior art, adopts the transient state travelling wave electric current that is produced after the fault to select fault wire.Can fundamentally solve low current neutral grounding system fault line options problem.
The fault-line selecting method of a kind of single-phase earthing of small current earthing system that the present invention proposes, it is characterized in that, survey and write down the current traveling wave that is connected to each the loop line road on the identical bus, wherein initial transient current travelling waves numerical value maximum, polarity and other line current polarity of traveling wave opposite are exactly faulty line.
When if said circuit is three-phase line, then the capable ripple of phase current of each circuit and the capable ripple of phase current of corresponding line are compared, perhaps adopt the modulus current traveling wave to compare, wherein initial transient current travelling waves numerical value maximum, polarity and other circuit are corresponding mutually or mould current traveling wave polarity opposite, are exactly faulty line.
Above-mentioned detection method is: make Current Transformer change the big electrorheological in the circuit into 1 or 5 ampere little electric current, by current-to-voltage converter this little current signal is transformed into the small voltage signal again, carry out record.
The principle of method foundation of the present invention:
The inventor confirms first by emulation experiment and actual tests: during small current neutral grounding system generation singlephase earth fault, under the effect of trouble spot additional supply, with the capable ripple of voltage and current that produces to the substation bus bar motion.Whether ground connection is irrelevant for capable ripple that this is initial and neutral point, and it is an outwardness.
The current traveling wave that comes from the trouble spot moves to substation bus bar through faulty line, at the bus place catadioptric will take place.Owing to generally be connected to many turnover circuits on the power distribution network bus, so the row wave reflection is very strong.
Wherein, the capable ripple on the faulty line is the strongest: it be come from the trouble spot initial reverse row ripple and the reflection after changed direction the ripple that moves ahead and.And the capable ripple on other circuit is to come from the capable wave refraction component on trouble spot and the faulty line and this component is only arranged.So numerical value is very little, polarity and faulty line are opposite.
The present invention proposes to realize the device of said method, it is characterized in that, is plugged on interface circuit, display circuit and power supply that transducer, data acquisition circuit, central processing unit, result on the circuit substrate export successively; Said transducer will come from the loop to be measured 1 ampere or 5 Ampere currents and be transformed into the small voltage signal, said data acquisition circuit is converted into digital signal to this little analog voltage signal, and is stored in the data-carrier store of this data acquisition circuit; Said central processing unit carries out Filtering Processing with the transient current travelling waves data that collect, and result of calculation, and the result after this interface circuit will be handled exports, and shows by display circuit.
Device main performance index of the present invention is as follows:
1, can monitor ten times distribution lines (can write down 30 analog quantity current traveling waves) simultaneously;
2, can select faulty line in real time, take place from earth fault, be selected to faulty line, the time is no more than 100 milliseconds;
The present invention can accurately select fault wire, and it can be applied to:
1. isolated neutral system singlephase earth fault line;
2. neutral by arc extinction coil grounding system single-phase earth fault route selecting;
3. neutral point is through the high resistance grounding system single-phase earth fault route selecting;
Neutral point through in resistance eutral grounding fault single-phase grounding selecting;
5. neutral point is through the route selection of the low resistance earthing system failure;
6. the route selection of neutral-point solid ground (heavy current grounding system) system failure.
Description of drawings
Fig. 1 utilizes the low-current ground fault line selection principle key diagram of current traveling wave for the present invention.
Fig. 2 is a low-current ground fault line selection device embodiment overall construction drawing of the present invention.
Fig. 3 is the data acquisition board circuit structure diagram of present embodiment.
Fig. 4 is the central processing unit plate circuit structure diagram of present embodiment.
Embodiment the present invention proposes a kind of low-current ground fault line selection method and device embodiment is described in detail as follows in conjunction with each accompanying drawing:
The main points of this method are: the transient current travelling waves that is produced when utilizing earth fault to take place is selected fault wire.Wherein, in the distribution line on being connected to same transformer station, distribution substation bus, if earth fault takes place.So:
(1) the initial transient current travelling waves numerical value maximum that is occurred on the faulty line, the transient state travelling wave current values of other non-ground path is very little;
(2) polarity of faulty line current traveling wave and non-fault line are opposite;
(3) the current traveling wave polarity of non-fault line is identical.
This method is described as follows in conjunction with Fig. 1:
Current traveling wave (the i that comes from the trouble spot
1 instead goes) move to substation bus bar through faulty line, catadioptric (i will take place at the bus place
1 moves ahead).Owing to generally be connected to many turnover circuits on the power distribution network bus, so the row wave reflection is very strong.
Wherein, the capable ripple on the faulty line is the strongest: it is the initial reverse row ripple (i that comes from the trouble spot
1 instead goes) and reflection after changed the ripple (i that moves ahead of direction
1 moves ahead) and.
I1=i
1 instead goes+ i
1 moves ahead
And the capable ripple on other circuit is the capable wave refraction component (i that comes from trouble spot and the faulty line
2, i
3, i
4), and this component is only arranged.So numerical value is very little, polarity and faulty line are opposite.
i
1And i
2, i
3, i
4Polarity is opposite
i
1Greater than i
2, i
3, i
4
According to this feature, the method for failure line selection is:
Write down the current traveling wave on every loop line road, wherein numerical value maximum, polarity and other line current polarity of traveling wave opposite are exactly faulty line.
In actual three-phase line, the phase current of each circuit should compare with the phase current of corresponding line.
Therefore this method can simplified summary be:
(1) the initial transient current travelling waves numerical value maximum that is occurred on the faulty line, the transient state travelling wave current values of other non-ground path is very little;
(2) polarity of faulty line current traveling wave and non-fault line are opposite;
(3) the current traveling wave polarity of non-fault line is identical.
According to the embodiment of a kind of low current neutral grounding system fault route selecting device of said method design as shown in Figure 2.Comprise a cabinet, interface board 24 and power panel 25 that one circuit substrate is plugged with converter plate 21, data acquisition board 22, central processing unit plate 23, result's output successively are set in this cabinet, hummer 26 and LCD screen 27 are housed in the front of cabinet, are separately installed with power supply jack 28 and incoming line 29 at the side and the back side of cabinet.
The composition and the function of above-mentioned each circuit board are described in detail as follows:
1. converter plate: its is coming from the voltage signal that 1 ampere of the current transformer that is connected on the loop to be measured or 5 Ampere currents are transformed into 5 volts, use for data acquisition, have ten loops, conversion 30 tunnel, there is three-phase current in each loop, and present embodiment adopts common current-to-voltage converter.
2. data acquisition board: it is converted into digital signal to this analog current signal of 5 volts, and is stored in the data-carrier store;
This plank is made up of the hardware-initiated unit I of earth fault and data acquisition unit II two parts, as shown in Figure 3.Wherein:
Hardware-initiated unit I is an input current and a threshold value (definite value) relatively, if when the high frequency transient component in the input current reaches threshold value, and the comparer output low level.Judgement ground connection has been taken place.
Hardware-initiated unit I is made up of a bandwidth-limited circuit (the bandpass filter frequency is the 3-10 KHz) and comparer chip (LM293).
Data acquisition unit II is made up of 8 multicircuit switches, 8 high-speed AD converter chips, data-carrier store and correspondent control circuits.(analog to digital conversion) 30 tunnel current data are ceaselessly gathered in the high-speed AD converter circulation, and store in the data-carrier store.
The AD803 that 8 analog to digital converter chips of present embodiment adopt AD company to produce, the AD9300 that 8 multi-way switchs (each multi-way switch is connected four tunnel simulating signal timesharing to 8 AD) adopt the said firm to produce.The loop-around data storer adopts dual port RAM.
3. central processing unit plate: it carries out Filtering Processing to the transient current travelling waves data that data acquisition board collects, and then selects fault wire according to aforesaid selection method.
The composition of this plank is made up of digital signal processor and correspondent peripheral circuit as shown in Figure 4.The amplitude of its main combine digital filtering one wavelet transformation, phase-model transformation and 10 circuits (20 modulus electric currents) and polarity are relatively.
The digital signal processor of present embodiment adopts the TMS320C32 DSP chip of TI company.Among the figure, RAM is a data-carrier store, and Flash is a program storage.Expression such as 16D, 32D is 16 or 32 s' data bus or a program bus
4. output interface plate as a result: this plank shows the result of central processing unit result of calculation (digital quantity) output, and notifies the operator on duty by hummer by LCD screen.
5. power supply: the working power that package unit is provided.
The course of work of present embodiment:
If one single-phase earthing has taken place circuit, this device will start work, and its course of work is as follows:
1, by being installed on the current transformer of (totally ten times) on every circuit, the three-phase current of every circuit (amounting to 30) is introduced into converter plate;
2, each transducer electrorheological about 5 amperes (or 1 amperes) coming from current transformer changes 5 volts voltage signal into;
3, the start unit of high-speed data acquisition plate front will detect the disturbance generation, hardware-initiated unit starting, output triggering level;
4, the data acquisition in the high-speed data acquisition unit is continuous round-robin, if hardware-initiated element starts, then reads 200 sampled points of every circuit three-phase current data from cyclic store;
5, to these 30 independently 200 point data carry out digital filtering and handle;
6, they are carried out phase-model transformation, above-mentioned three-phase electricity flow valuve (A phase, B phase, C phase) is transformed into three modulus electric currents (α modulus, β modulus, 0 modulus);
7, according to every circuit correspondence two line moulds (α modulus and β modulus), the zero sequence modulus is not relatively selected faulty line.
8, selection result (digital quantity, 0 representative is not a fault wire, 1 represents fault wire) is outputed to the result and exports plate as a result.
9, output board will provide the hummer cry as a result, notify the operator on duty, and selection result will be presented on the LCD screen.
Claims (3)
1, a kind of fault-line selecting method of single-phase earthing of small current earthing system, it is characterized in that, survey and write down the current traveling wave that is connected to each the loop line road on the identical bus, wherein initial transient current travelling waves numerical value maximum, polarity and other line current polarity of traveling wave opposite are exactly faulty line.
2, the fault-line selecting method of single-phase earthing of small current earthing system as claimed in claim 1, it is characterized in that, said circuit is a three-phase line, the capable ripple of phase current of each circuit and the capable ripple of phase current or the modulus current traveling wave of corresponding line are compared, wherein initial transient current travelling waves numerical value maximum, polarity and other circuit are corresponding mutually or mould current traveling wave polarity opposite, are exactly faulty line.
3, the fault-line selecting method of single-phase earthing of small current earthing system as claimed in claim 1, it is characterized in that, said detection method is: make Current Transformer the big electrorheological in the circuit be changed into 1 or 5 ampere little electric current, by current-to-voltage converter this little current signal is transformed into the small voltage signal again, carries out record.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101173599A CN1508554A (en) | 2001-06-01 | 2001-06-01 | Single-phase earthing failure line-selecting method for small-current earthing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101173599A CN1508554A (en) | 2001-06-01 | 2001-06-01 | Single-phase earthing failure line-selecting method for small-current earthing system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01118471XA Division CN1155833C (en) | 2001-06-01 | 2001-06-01 | Fault-line selecting method and device for small-current earthing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1508554A true CN1508554A (en) | 2004-06-30 |
Family
ID=34256874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2003101173599A Pending CN1508554A (en) | 2001-06-01 | 2001-06-01 | Single-phase earthing failure line-selecting method for small-current earthing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1508554A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100526895C (en) * | 2007-06-06 | 2009-08-12 | 清华大学 | Distributing capacitance current and transition resistance influence resisting line one-end fault ranging method |
| CN101533062B (en) * | 2009-04-03 | 2011-01-12 | 清华大学 | Power cable on-line insulated monitoring method based on traveling wave electric amount measurement |
| CN102148495A (en) * | 2011-03-03 | 2011-08-10 | 清华大学 | Single-phase earth fault self-healing device and system |
| CN102280866A (en) * | 2011-02-10 | 2011-12-14 | 清华大学 | Traveling wave data acquisition and processing device |
| CN101295873B (en) * | 2007-04-28 | 2012-07-04 | 上海思南电力通信有限公司 | Medium-voltage power distribution network single-phase ground fault route selection method based on fault procedure analysis |
| CN101719662B (en) * | 2009-11-06 | 2012-08-08 | 北京衡天北斗科技有限公司 | Fault line selection device for distribution line of small-current grounding system |
| CN105548806A (en) * | 2015-12-14 | 2016-05-04 | 山东理工大学 | Small current grounding fault line selection method based on transient traveling wave |
| CN106093714A (en) * | 2016-08-26 | 2016-11-09 | 淄博博鸿电气有限公司 | The selection method of single-phase grounded malfunction in grounded system of low current circuit |
-
2001
- 2001-06-01 CN CNA2003101173599A patent/CN1508554A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295873B (en) * | 2007-04-28 | 2012-07-04 | 上海思南电力通信有限公司 | Medium-voltage power distribution network single-phase ground fault route selection method based on fault procedure analysis |
| CN100526895C (en) * | 2007-06-06 | 2009-08-12 | 清华大学 | Distributing capacitance current and transition resistance influence resisting line one-end fault ranging method |
| CN101533062B (en) * | 2009-04-03 | 2011-01-12 | 清华大学 | Power cable on-line insulated monitoring method based on traveling wave electric amount measurement |
| CN101719662B (en) * | 2009-11-06 | 2012-08-08 | 北京衡天北斗科技有限公司 | Fault line selection device for distribution line of small-current grounding system |
| CN102280866A (en) * | 2011-02-10 | 2011-12-14 | 清华大学 | Traveling wave data acquisition and processing device |
| CN102148495A (en) * | 2011-03-03 | 2011-08-10 | 清华大学 | Single-phase earth fault self-healing device and system |
| CN102148495B (en) * | 2011-03-03 | 2013-09-25 | 清华大学 | Single-phase earth fault self-healing device and system |
| CN105548806A (en) * | 2015-12-14 | 2016-05-04 | 山东理工大学 | Small current grounding fault line selection method based on transient traveling wave |
| CN106093714A (en) * | 2016-08-26 | 2016-11-09 | 淄博博鸿电气有限公司 | The selection method of single-phase grounded malfunction in grounded system of low current circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1155833C (en) | Fault-line selecting method and device for small-current earthing system | |
| CN1180272C (en) | Small-current earth fault switch-selecting and sectioning method for power system | |
| CN1804649A (en) | Fault line selection method for single-phase-to-ground fault in small ground current distribution network | |
| CN201532430U (en) | Distribution circuit fault route selecting apparatus for arc-suppression coil grounding system through neutral points | |
| Tian et al. | 400 V/1000 kVA hybrid automatic transfer switch | |
| CN1800867A (en) | Single-phase earth fault line selection method for medium and low voltage distribution network | |
| CN101188386A (en) | PWM current rectifying system based on DSP and CPLD | |
| CN201478809U (en) | Single-phase grounding line selection device for 20 kV power grid | |
| CN1508554A (en) | Single-phase earthing failure line-selecting method for small-current earthing system | |
| CN2729740Y (en) | Apparatus for detecting grounding fault of electric distribution network | |
| CN202978426U (en) | Fault detection terminal based on power distribution automation | |
| CN1453916A (en) | Wire selecting method and device for single-phase earthing of small current earthing system | |
| Liang et al. | Single-Phase ground fault traveling wave line selection method and line selection device field test | |
| CN201685724U (en) | Novel ground overcurrent phase-split control device | |
| CN100365899C (en) | High roltage circuit high resistance grounding protective method | |
| CN208539613U (en) | Direct current micro-grid system and charge circuit circuit | |
| CN212723172U (en) | Synchronous transient recording-type high-current pulse line selection and fault processing device | |
| CN2594804Y (en) | Cable checking instrument | |
| CN101299543B (en) | Solar controller | |
| CN203747426U (en) | Low-voltage dynamic filtering reactive compensation device | |
| CN207742244U (en) | A kind of failure wave-recording control system for SVG | |
| CN201004554Y (en) | Automatic tracking grounding compensation device control for capacitance adjusting arc extinguishment coil | |
| CN108020707A (en) | A kind of failure wave-recording control system for SVG | |
| CN114325468B (en) | Method for carrying out grounding phase selection and line selection by utilizing 66kV active intervention arc extinction device | |
| CN214228123U (en) | Voltage transformation system with instantaneous quick-break protection function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |