CN105548817A - Single-phase grounding judgment method for 10kV overhead line - Google Patents
Single-phase grounding judgment method for 10kV overhead line Download PDFInfo
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- CN105548817A CN105548817A CN201610028923.7A CN201610028923A CN105548817A CN 105548817 A CN105548817 A CN 105548817A CN 201610028923 A CN201610028923 A CN 201610028923A CN 105548817 A CN105548817 A CN 105548817A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a single-phase grounding judgment method for a 10kV overhead line, and the method comprises the steps: connecting a controllable resistor grounding integrated device at a neutral point of a grounding transformer of a transformer substation, and employing a reverse parallel connection silicon controlled rectifier to replace a conventional vacuum switch; changing a compensation coefficient of an arc suppression coil through the controllable resistor grounding integrated device after a perpetual single-phase grounding fault happens to a bus end of the transformer substation, thereby changing a compensation current IL generated by the arc suppression coil, wherein a fault line current delta I is equal to the difference of IL and IC, and IC is a grounding fault capacitor current. Therefore, a larger fault current delta I can be generated actively through changing IL, wherein IL is greater than 10A and less than 20A. Moreover, the fault current has pre-defined periodic features. A specific fault detector is used for monitoring a current signal in real time, thereby achieving the purpose of fault positioning. The method is correct in principles, is practical, can effectively detect the fault, and cooperates with fault detection equipment for the positioning of a fault section, a fault branch, and a fault point.
Description
Technical field
The present invention relates to the technical field that 10kV overhead transmission line singlephase earth fault judges, refer in particular to a kind of 10kV overhead transmission line single-phase earthing determination methods.
Background technology
The distribution system (6-35kV system) of China is neutral point non-direct grounding system, except peer machine is small resistance grounding system, most systems is through grounding through arc or isolated neutral system, be called non-effectively earthed system, the accurate location of the singlephase earth fault of non-effectively earthed system is a world-famous puzzle.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of 10kV overhead transmission line single-phase earthing determination methods based on controllable type resistance eutral grounding complete equipment is provided, by access controllable type resistance eutral grounding complete equipment, the problem that centering point isolated neutral system ground current is little is artificially amplified, make fault detector more conveniently ground current can be detected by of short duration controlled amplification ground current, thus improve ground connection judging nicety rate.
For achieving the above object, technical scheme provided by the present invention is: a kind of 10kV overhead transmission line single-phase earthing determination methods, first, the neutral point that substation grounding becomes accesses controllable type resistance eutral grounding complete equipment, and adopt a reverse parallel connection controllable silicon to replace traditional vacuum switch, after substation bus bar end detects that permanent singlephase earth fault occurs circuit, arc suppression coil compensation coefficient is changed by controllable type resistance eutral grounding complete equipment, the offset current IL that arc suppression coil produces can be changed, and faulty line electric current △ I=IL-IC, wherein IC is fault capacitance electric current over the ground, therefore, by changing IL, initiatively can produce larger fault current △ I, wherein 10A< △ I<20A, and this fault current has predefined periodic feature, specific fault detecting device is utilized to carry out this current signal of Real-Time Monitoring, the object of localization of fault can be reached, its breakdown judge comprises the following steps:
1) residual voltage data are gathered by the residual voltage sensor of controllable type resistance eutral grounding complete equipment;
2) judge whether the residual voltage collected is greater than setting value; If be greater than, then export high-accuracy compensation electric current, carry out step 3); If be less than, then return step 1);
3) judge whether residual voltage is eliminated, and namely whether fault is eliminated; If eliminate, then report to the police as transient earthing fault, return step 1); If do not eliminate, then drop into small resistor in short-term, to increase fault current, make electric current produce larger fluctuation, and report to the police as continuous earth fault, wherein fault current has predefined periodic feature, then carry out step 4);
4) utilize this current signal of specific fault detecting device Real-Time Monitoring, then gather fault detector alert data, carry out fault reconnaissance location, select fault section, thus reach the object of fault effective location.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, the present invention is by adopting reverse parallel connection controllable silicon to realize accurate high-accuracy compensation electric current, reduces ground current, eliminates the transient faults such as arc grounding.
2, the present invention with the current characteristic of regular formula increase permanent earth fault, makes fault detector (i.e. fault detector) judge that earth fault is more accurate by adopting controllable type resistance eutral grounding complete equipment to carry out control system neutral point in short-term.
3, the present invention utilizes controllable type resistance eutral grounding complete equipment and fault detector (i.e. fault detector) to combine to eliminate by offset current to realize distribution line transient fault, permanent fault forms larger line fault electric current by regular control neutral point mode, carries out localization of fault judgement by fault detector (i.e. fault detector).
Accompanying drawing explanation
Fig. 1 judges schematic diagram based on the 10kV overhead transmission line single-phase earthing of controllable type resistance eutral grounding complete equipment.
Fig. 2 is the structural representation of controllable type resistance eutral grounding complete equipment.
Fig. 3 is Control timing sequence schematic diagram.
Fig. 4 is breakdown judge process flow diagram.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
10kV overhead transmission line single-phase earthing determination methods described in the present embodiment, based on controllable type resistance eutral grounding complete equipment, specifically on the neutral point of substation grounding change, access controllable type resistance eutral grounding complete equipment, when automatically dropping in short-term after suitable time-delay after earth fault occurs, the method is applied in line fault wire selection system completely, shows through site test and actual motion practice: the method principle is correct, practical, can effective detection failure; Coordinate with fault test set and can position fault section, fault branch and trouble spot.Its technology detailed content is as follows:
After substation bus bar end detects that permanent singlephase earth fault occurs circuit, change arc suppression coil compensation coefficient by controllable type resistance eutral grounding complete equipment, the offset current IL that arc suppression coil produces can be changed.Faulty line electric current △ I=IL-IC, wherein IC is fault capacitance electric current over the ground.Therefore, by changing IL, larger fault current △ I (10A< △ I<20A) can initiatively be produced.This fault current has predefined periodic feature (as every 2 cycles change single compensation coefficient, each lasting 2 cycles).Utilize specific fault detecting device to carry out this current signal of Real-Time Monitoring, reach the object of localization of fault.
Described controllable type resistance eutral grounding complete equipment have fast response time, regulate at any time, can drop into fast, exit, the technical characterstics such as the continuous electrodeless adjustment of output current 0-100% rated current scope.This controllable type resistance eutral grounding complete equipment design concept as depicted in figs. 1 and 2, specifically a changeable type stake resistance is set in transformer station or a certain group of leading-out terminal, a reverse parallel connection controllable silicon replaces traditional vacuum switch, a residual voltage sensor, measures neutral point displacement voltage and controls silicon controlled microcontroller for one.
Controllable type resistance eutral grounding complete equipment are when getting involved neutral point work, the control of switch splitting or integrating lock is carried out by controlling reverse parallel connection controllable silicon, (10 seconds) are under the effect of residual voltage in a period of time, can produce a group coding ground current pulse (being also power current) (its pulse width, recurrence interval control by certain encoding law).
As shown in Figure 3, every 2 cycles change single compensation coefficient, each lasting 2 cycles.This sequential can customize in advance, also can revise in the later stage.
When earth fault occurs, controllable resistor earthing device exports high-accuracy compensation electric current immediately in short-term, reduces ground current, eliminates arc light.If earth fault is transient single-phase earth fault, then Failure elimination, recover normal condition.If non-transient earth fault then controls high voltage connector by instantaneous for small resistor input coefficient, utilize specific fault detecting device to carry out this current signal of Real-Time Monitoring, reach the object of localization of fault.As shown in Figure 4, specifically comprise the following steps:
1) residual voltage data are gathered by the residual voltage sensor of controllable type resistance eutral grounding complete equipment;
2) judge whether the residual voltage collected is greater than setting value; If be greater than, then export high-accuracy compensation electric current, carry out step 3); If be less than, then return step 1);
3) judge whether residual voltage is eliminated, and namely whether fault is eliminated; If eliminate, then report to the police as transient earthing fault, return step 1); If do not eliminate, then drop into small resistor in short-term, to increase fault current, make electric current produce larger fluctuation, and report to the police as continuous earth fault, wherein fault current has predefined periodic feature, then carry out step 4);
4) utilize this current signal of specific fault detecting device Real-Time Monitoring, then gather fault detector alert data, carry out fault reconnaissance location, select fault section, thus reach the object of fault effective location.
The examples of implementation of the above are only the preferred embodiment of the present invention, not limit practical range of the present invention with this, therefore the change that all shapes according to the present invention, principle are done, all should be encompassed in protection scope of the present invention.
Claims (1)
1. a 10kV overhead transmission line single-phase earthing determination methods, is characterized in that: first, and the neutral point that substation grounding becomes accesses controllable type resistance eutral grounding complete equipment, and adopts a reverse parallel connection controllable silicon to replace traditional vacuum switch, after substation bus bar end detects that permanent singlephase earth fault occurs circuit, arc suppression coil compensation coefficient is changed by controllable type resistance eutral grounding complete equipment, the offset current IL that arc suppression coil produces can be changed, and faulty line electric current △ I=IL-IC, wherein IC is fault capacitance electric current over the ground, therefore, by changing IL, initiatively can produce larger fault current △ I, wherein 10A< △ I<20A, and this fault current has predefined periodic feature, specific fault detecting device is utilized to carry out this current signal of Real-Time Monitoring, the object of localization of fault can be reached, its breakdown judge comprises the following steps:
1) residual voltage data are gathered by the residual voltage sensor of controllable type resistance eutral grounding complete equipment;
2) judge whether the residual voltage collected is greater than setting value; If be greater than, then export high-accuracy compensation electric current, carry out step 3); If be less than, then return step 1);
3) judge whether residual voltage is eliminated, and namely whether fault is eliminated; If eliminate, then report to the police as transient earthing fault, return step 1); If do not eliminate, then drop into small resistor in short-term, to increase fault current, make electric current produce larger fluctuation, and report to the police as continuous earth fault, wherein fault current has predefined periodic feature, then carry out step 4);
4) utilize this current signal of specific fault detecting device Real-Time Monitoring, then gather fault detector alert data, carry out fault reconnaissance location, select fault section, thus reach the object of fault effective location.
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| CN201610028923.7A CN105548817A (en) | 2016-01-15 | 2016-01-15 | Single-phase grounding judgment method for 10kV overhead line |
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| CN201610028923.7A CN105548817A (en) | 2016-01-15 | 2016-01-15 | Single-phase grounding judgment method for 10kV overhead line |
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Cited By (2)
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| TWI641854B (en) * | 2017-06-23 | 2018-11-21 | 宏碁股份有限公司 | Fault warning circuit |
| CN109917231A (en) * | 2019-04-09 | 2019-06-21 | 国网四川省电力公司电力科学研究院 | The system and method for electric energy metering device metering performance is obtained under singlephase earth fault |
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| CN104730414A (en) * | 2015-01-28 | 2015-06-24 | 合肥天海电气技术有限公司 | Circuit selecting device and method for single-phase grounding of resonance grounding system |
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| CN109917231B (en) * | 2019-04-09 | 2021-05-14 | 国网四川省电力公司电力科学研究院 | System and method for acquiring metering performance of electric energy metering device under single-phase earth fault |
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Application publication date: 20160504 |