CN109932616A - 10kV distribution lacks judgement and the localization method of a phase fault - Google Patents
10kV distribution lacks judgement and the localization method of a phase fault Download PDFInfo
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- CN109932616A CN109932616A CN201910259532.XA CN201910259532A CN109932616A CN 109932616 A CN109932616 A CN 109932616A CN 201910259532 A CN201910259532 A CN 201910259532A CN 109932616 A CN109932616 A CN 109932616A
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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
Abstract
The invention discloses judgement and localization methods that a kind of 10kV distribution lacks a phase fault, and use following steps: step 1, the starting voltage for adjusting electroscope are allowed to the voltage higher than high voltage side of transformer phase shortage phase；Survey or in-site measurement distribution line step down side three-phase phase voltage value are called together by remote information acquisition system, when a phase voltage value is normal, when the sum of another two-phase voltage value is less than 3V with the absolute value of the difference of the voltage value of normal phase simultaneously, then determine that fault type lacks a phase for transformer, and this transformer is in the load side of phase shortage point；Step 2, using each phase voltage of high voltage side of transformer in electroscope detecting step 1 adjusted in step 1, when only measuring a phase, the acousto-optic instruction device of electroscope is failure to actuate, then determine that this is mutually phase shortage, and fault coverage is contracted in this phase of the transformer, and indicate phase shortage point in the source side of the high pressure access point of this transformer.The present invention just can determine that abort situation without seeing phenomenon of the failure.
Description
Technical field
The present invention relates to judgement and localization methods that a kind of 10kV distribution lacks a phase fault, belong to power fault analysis neck
Domain.
Background technique
10kV distribution lack a phase when, will lead to motor can not start, phase shortage reason be for example break, switch close a floodgate less than
Position etc..Generally judge the method for failure it has to be observed that phenomenon of the failure, just can determine that abort situation, directly results in make an inspection tour and not be directed toward
Property, and can not find hidden failure.This is the major drawbacks for judging fault method at present.Analysis for failure is handled first
It is the judgement to fault type, followed by the judgement of abort situation.For example, 16 divide on September 7,17 2018, it is fine, it is calm,
After phase no-voltage reaches scene in the green offline East Zhongshan Road 14# bar transformer low voltage of Chang'an repairing class report 942 people of people's livelihood station, measure
Voltage value at low voltage knife switch are as follows: A phase 175V, B phase voltage shakiness about 64V, C phase 239V.Low voltage three-phase disconnecting link is pulled open at this time, is found
Low pressure B phase voltage is still unstable, excludes low voltage failure；Low voltage three-phase fusion tube is removed, the installation of phase fuse is not firm in discovery, place
Low pressure B phase voltage value, which is stablized, after reason asks 64V, excludes high pressure fusion tube failure；It only disconnects A, B, C phase respectively to insure, in transformer height
Pressure exit electrical appliance, which measures three-phase, voltage, excludes high-voltage insurance failure；In view of the previous day, this becomes at platform insurance and occurs
Short trouble is crossed, therefore, it is determined that being transformer problem.00 divides completion transformer more to change jobs when about 22, measures Three-Phase Transformer electricity
Pressure value is still abnormal, then make an inspection tour again in learn, neighbouring one Xiang Wu electricity of high voltage customer report low pressure, Chang'an repairing class report closes on change platform
Middle Xiang Wu electricity has found that the street Cong Qingyuan to East Zhongshan Road B phase wire jumper is under strain clamp when 23 after the lookup of high power camera
5 centimeters of mouth are blown, but insulated hull does not break.
Why break mutually can still test out and have electricity? because the rodlike concertina type high voltage electroscope of usually used 10kV belongs to
Condensing type electroscope, it flows through the electric current in the stray capacitance over the ground of electroscope by detection, detects high voltage electric equipment, route
Whether charge.It is provided according to People's Republic of China (PRC) power industry standard DL740-2000, its starting voltage is 0.1~0.45
Voltage rating again, i.e. starting voltage is about 1kV~4.5kV.Such as: it is 2kV with the starting voltage of 10kV electroscope now, goes
Testing phase electrification is 3kV route, then electroscope also will call the police.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind can gradually reduce fault point range that may be present
10kV distribution lack a phase fault judgement and localization method.
The present invention adopts the following technical scheme:
A kind of 10kV distribution lacks judgement and the localization method of a phase fault, using following steps:
Step 1, the starting voltage for adjusting electroscope are allowed to the voltage higher than high voltage side of transformer phase shortage phase；
Survey or in-site measurement distribution line step down side three-phase phase voltage value are called together by remote information acquisition system, when
One phase voltage value is normal, while when the sum of another two-phase voltage value and the absolute value of the difference of the voltage value of normal phase are less than 3V, then sentencing
Determining fault type is that transformer lacks a phase, and this transformer is in the load side of phase shortage point；
Step 2, using each phase voltage of high voltage side of transformer in electroscope detecting step 1 adjusted in step 1, when only surveying
The acousto-optic instruction device of electroscope is failure to actuate when measuring a phase, then determines that this is mutually phase shortage, and fault coverage is contracted to the transformation
In this phase of device, and indicate phase shortage point in the source side of the high pressure access point of this transformer.
Further, the distribution line transformer is Dyn11 type transformer.
Further, the normal range of a phase voltage value is 198V~235.4V in the step 1.
Further, the equipment of detection is used for as electroscope in the step 1 and step 2.
Further, the starting voltage that electroscope is adjusted in the step 1 is allowed to higher than high voltage side of transformer phase shortage phase
Voltage, the specific method is as follows: prepare an a certain phase phase shortage transformer, phase shortage phase it is known that constantly adjustment electroscope in contact
Connected divider resistance R1 and the R2 size of electrode, and the high voltage side of transformer phase shortage phase is measured using electroscope adjusted, directly
Do not start and the electroscope starting of when normal phase in measuring transformer high-pressure side to electroscope when measuring the phase shortage phase, at this time
Divider resistance R1 and R2 no longer adjust, electroscope starting voltage be higher than high voltage side of transformer phase shortage phase voltage, complete adjust
It is whole.
Beneficial effects of the present invention are as follows:
The present invention can effectively overcome the deficiencies of existing technologies, and without seeing phenomenon of the failure, just can determine that abort situation.Pass through
This method detects twice, gradually reduces fault point range that may be present, has more directive property so that making an inspection tour, and be conducive to find
Hidden failure.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the detection schematic diagram for detecting the low-pressure side of transformer.
Fig. 2 is the on high-tension side detection schematic diagram for detecting transformer.
Fig. 3 is the circuit diagram of electroscope.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, 1- Fig. 3 and specific embodiment with reference to the accompanying drawing
Clear, complete description is carried out to invention.
A kind of 10kV distribution lacks judgement and the localization method of a phase fault, utilizes the low pressure of common Dyn11 type transformer
The relationship of three-phase voltage value carries out the judgement of fault type, utilizes improved 10kV high voltage electroscope (hereinafter referred to as electrical verification
Device) carry out fault type judgement and failure more accurately position, detected twice by this method, gradually reduce fault point can
Range existing for energy has more directive property so that making an inspection tour, and is conducive to find hidden failure, can effectively overcome lacking for the prior art
It falls into, without seeing phenomenon of the failure, just can determine that abort situation.Specifically use following steps:
Step 1, the starting voltage for adjusting electroscope are allowed to the voltage higher than high voltage side of transformer phase shortage phase；
Survey or in-site measurement distribution line step down side three-phase phase voltage value are called together by remote information acquisition system, when
One phase voltage value is normal, while when the sum of another two-phase voltage value and the absolute value of the difference of the voltage value of normal phase are less than 3V, then sentencing
Determining fault type is that transformer lacks a phase, and this transformer is in the load side of phase shortage point；When principle is a phase scarce because of transformer,
One phase voltage of low pressure is normal, and this phase voltage value is equal to the sum of another two-phase voltage value.
Step 2, using each phase voltage of high voltage side of transformer in electroscope detecting step 1 adjusted in step 1, when only surveying
The acousto-optic instruction device of electroscope is failure to actuate when measuring a phase, then determines that this is mutually phase shortage, and fault coverage is contracted to the transformation
In this phase of device, and indicate phase shortage point in the source side of the high pressure access point of this transformer；Principle is because only phase shortage is mutually electric
It forces down in normal rating voltage.
Further, the distribution line transformer is Dyn11 type transformer.
Further, the normal range of a phase voltage value is 198V~235.4V in the step 1.
Further, the equipment of detection is used for as electroscope in the step 1 and step 2.
Further, the starting voltage that electroscope is adjusted in the step 1 is allowed to higher than high voltage side of transformer phase shortage phase
Voltage, the specific method is as follows: prepare an a certain phase phase shortage transformer, phase shortage phase it is known that constantly adjustment electroscope in contact
Connected divider resistance R1 and the R2 size of electrode, and the high voltage side of transformer phase shortage phase is measured using electroscope adjusted, directly
Do not start and the electroscope starting of when normal phase in measuring transformer high-pressure side to electroscope when measuring the phase shortage phase, at this time
Divider resistance R1 and R2 no longer adjust, electroscope starting voltage be higher than high voltage side of transformer phase shortage phase voltage, complete adjust
It is whole.
The reason of step 1 is set up is discussed below, as shown in Figure 1, the simplification of the three-phase high-low pressure winding of Dyn11 type transformer
Figure, it is assumed that high-pressure side A phase phase shortage has at this timeWithSame phase, and be apparent fromFurther according to transformer
The no-load voltage ratio of wiring group and transformer can derive that low-pressure side hasThat is Ua+Ub=Uc, it is possible thereby to prove
The correctness of step 1.
The reason of step 2 is set up is discussed below, because high-voltage coil and low-voltage coil is coupled by iron core, therefore step down side phase voltage
It is directly proportional to high-pressure side line voltage.Again by Dyn11 transformer in B phase phase shortage, low pressure a phase 175V, the b phase 64V of actual measurement,
C phase 239V data and Uac=10kV are known:
Obtain UAB=7.32kV, UBC=2.68kV
Again because high-pressure side A, C phase-to-ground voltage are normally 5.77kV, and angle is 120 °, can obtain Fig. 2, according to fig. 2
OB=3.68kV < 5.77kV can be obtained by solving triangle.
It follows that high-pressure side B phase-to-ground voltage is lower than voltage rating.
Low pressure side data when similarly, by high-pressure side A phase phase shortage: a phase 137.1V, b phase 235.2V, c phase 100.4V can be obtained
High-pressure side A phase-to-ground voltage is 2.34kV.
It is similar when gained voltage results are to A phase phase shortage since circulation is symmetrical when the C phase phase shortage of high-pressure side.
The rodlike concertina type high voltage electroscope of usually used 10kV belongs to condensing type electroscope, it flows through electrical verification by detection
Whether the electric current in the stray capacitance over the ground of device, detection high voltage electric equipment, route charge.According to People's Republic of China's electric power
Professional standard DL740-2000 regulation, the voltage rating that its starting voltage is 0.1~0.45 times, i.e. starting voltage is about 1kV
~4.5kV.But existing electroscope starting voltage is obviously relatively low, and when measuring phase shortage phase, electroscope remains to start, therefore can not be used to area
Divide phase shortage phase and normal phase.Electroscope circuit diagram with contact electrode the resistance R1 that is connected and resistance R2 as shown in figure 3, mainly rise point
Pressure effect, is converted into voltage signal for the capacitance current signal of acquisition, then does subsequent processing.It therefore can be by increasing R1 or subtracting
The method of small R2, Lai Tigao are filled with the voltage of subsequent process circuit, so as to improve the starting voltage of electroscope.For example, finding one
Model electroscope is disassembled, and measures R1=R2=330 kilo-ohms.The numerical value of resistance R2 is constantly adjusted in the case where B phase phase shortage
And testing high voltage side B phase (i.e. phase shortage phase) and A phase (i.e. normal phase), following table can be obtained:
As seen from the above table, phase shortage phase and normal phase can be distinguished with this electroscope when 190 kilo-ohms≤R2≤0.32 megaohm,
R2 might as well be enabled to take 255 kilo-ohms of intermediate value.Thus the feasibility of provable step 2.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment or equivalent replacement of some of the technical features；And
These are modified or replaceed, the spirit and model of technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (5)
1. judgement and localization method that a kind of 10kV distribution lacks a phase fault, which is characterized in that use following steps:
Step 1, the starting voltage for adjusting electroscope are allowed to the voltage higher than high voltage side of transformer phase shortage phase；
Survey or in-site measurement distribution line step down side three-phase phase voltage value are called together by remote information acquisition system, when a phase
Voltage value is normal, while when the sum of another two-phase voltage value and the absolute value of the difference of the voltage value of normal phase are less than 3V, then determine therefore
Hindering type is that transformer lacks a phase, and this transformer is in the load side of phase shortage point；
Step 2, using each phase voltage of high voltage side of transformer in electroscope detecting step 1 adjusted in step 1, when only measuring one
The acousto-optic instruction device of electroscope is failure to actuate when phase, then determines that this is mutually phase shortage, and fault coverage is contracted to the transformer
In this phase, and indicate phase shortage point in the source side of the high pressure access point of this transformer.
2. judgement and localization method that 10kV distribution according to claim 1 lacks a phase fault, it is characterised in that: described to match
Electric line transformer is Dyn11 type transformer.
3. judgement and localization method that 10kV distribution according to claim 2 lacks a phase fault, it is characterised in that: the step
The normal range of a phase voltage value is 198V ~ 235.4V in rapid 1.
4. judgement and localization method that 10kV distribution according to claim 1 lacks a phase fault, it is characterised in that: the step
Rapid 1 and step 2 in for detection equipment be electroscope.
5. judgement and localization method that 10kV distribution according to claim 1 lacks a phase fault, it is characterised in that: the step
The starting voltage that electroscope is adjusted in rapid 1 is allowed to be higher than the voltage of high voltage side of transformer phase shortage phase, and the specific method is as follows: preparing one
The transformer of a certain phase phase shortage, phase shortage phase is it is known that the divider resistance R1 and R2 being constantly connected in adjustment electroscope with contact electrode
Size, and the high voltage side of transformer phase shortage phase is measured using electroscope adjusted, until measuring the electrical verification when phase shortage phase
Device does not start and the electroscope starting of when normal phase in measuring transformer high-pressure side, and divider resistance R1 and R2 at this time is no longer adjusted
Whole, the starting voltage of electroscope is higher than the voltage of high voltage side of transformer phase shortage phase, completes adjustment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910259532.XA CN109932616B (en) | 2019-04-02 | 2019-04-02 | Method for judging and positioning one-phase-lack fault of 10kV distribution network |
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| CN201910259532.XA CN109932616B (en) | 2019-04-02 | 2019-04-02 | Method for judging and positioning one-phase-lack fault of 10kV distribution network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110609181A (en) * | 2019-10-08 | 2019-12-24 | 云南电力技术有限责任公司 | Phase-missing judgment method and device for distribution transformer |
| CN110794226A (en) * | 2019-10-08 | 2020-02-14 | 云南电力技术有限责任公司 | Method and device for judging fused phase in three-phase three-column type distribution transformer |
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| WO1996010189A1 (en) * | 1994-09-29 | 1996-04-04 | Pacific Gas And Electric Company | Fault sensor device with radio transceiver |
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| CN110609181A (en) * | 2019-10-08 | 2019-12-24 | 云南电力技术有限责任公司 | Phase-missing judgment method and device for distribution transformer |
| CN110794226A (en) * | 2019-10-08 | 2020-02-14 | 云南电力技术有限责任公司 | Method and device for judging fused phase in three-phase three-column type distribution transformer |
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| CN109932616B (en) | 2021-01-08 |
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