CN108196214A - Feeder line zero sequence current mutual inductor CT polarity check methods and device - Google Patents
Feeder line zero sequence current mutual inductor CT polarity check methods and device Download PDFInfo
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- CN108196214A CN108196214A CN201711326422.8A CN201711326422A CN108196214A CN 108196214 A CN108196214 A CN 108196214A CN 201711326422 A CN201711326422 A CN 201711326422A CN 108196214 A CN108196214 A CN 108196214A
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- feeder line
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of feeder line zero sequence current mutual inductor CT polarity check methods and devices.Wherein, this method includes：Under system electriferous state, information of the record system busbar institute with each feeder line, wherein, the phase of information including zero-sequence current and the phase of residual voltage；According to information, the feeder line in the range of 90 ° of ± Δs of phase of zero-sequence current lag residual voltage is selected；Determining the zero sequence CT polarity of the feeder line selected, there are wiring errors.The present invention, which solves, in the energized state carries out feeder line zero sequence current mutual inductor CT the technical issues of polarity verification accuracy is low in the relevant technologies.
Description
Technical field
The present invention relates to circuit checks fields, are verified in particular to a kind of feeder line zero sequence current mutual inductor CT polarity
Method and device.
Background technology
The earthing mode of power network neutral point is mainly directly grounded, low resistance grounding, isolated neutral and extinguishing arc
Coil is grounded four classes, wherein, it is directly grounded and belongs to high current earthing mode with low resistance grounding, in addition belong to low current and connect for two kinds
Ground mode, according to statistics, the existing distribution neutral point in China in a manner of small current neutral grounding based on, which kind of earthing mode all has zero sequence
The configuration requirement of CT.
Wherein, single-phase earthing is the major failure form of operation of power networks, accounts for about more than the 70% of full electric network total failare, for
Small current neutral grounding system, singlephase earth fault is more common, if faulty line cannot be selected in time, and is reliably isolated, and will influence
The person and equipment safety or even phase fault is developed into, cause more major break down and loss, so small current earthing wire-selecting
Accuracy is directly related to the safety and reliability of electric system, and the route selection accuracy of small current grounding fault is generally acknowledged
Hard nut to crack, the accuracy of major part substation of China line selection apparatus action less than 50%, among these with the installation of zero sequence CT,
Polarity accurately whether, type selecting it is closely related.
At present, in the related art, distribution isolated neutral mode accounts for more than 68%, for isolated neutral system
System, zero sequence reactive power direction route selection method is that reliable, Japanese operating experience is showing its practical route selection just in principle
Positive motion makees rate more than 90%.And that accuracy rate is acted in China's isolated neutral system is just far short of what is expected for the line selection apparatus of same principle, removes
Outside product quality and management service reason, main cause is：The feeder line zero sequence CT incorrect polarities of generally existing access device, make
Into the mistake of route selection result, so that influence Supply Security；And the polarity verification and incorrect polarity corrigendum of zero sequence CT usually require
Power failure operation, it is extremely inconvenient, influence power supply reliability, thus there is an urgent need to one kind can with hot line job, accurately verify zero sequence
CT polarity and the facilitated method and device that zero sequence CT incorrect polarities can be corrected.
For it is above-mentioned the problem of, currently no effective solution has been proposed.
Invention content
An embodiment of the present invention provides a kind of feeder line zero sequence current mutual inductor CT polarity check methods and device, at least to solve
The technical issues of certainly carrying out polarity verification accuracy in the relevant technologies to feeder line zero sequence current mutual inductor CT in the energized state.
One side according to embodiments of the present invention provides a kind of feeder line zero sequence current mutual inductor CT polarity verification side
Method, including：Under system electriferous state, information of the record system busbar institute with each feeder line, wherein, information is including zero-sequence current
The phase of phase and residual voltage；According to information, the feedback in the range of 90 ° of ± Δs of phase of zero-sequence current lag residual voltage is selected
Line；Determining the zero sequence CT polarity of the feeder line selected, there are wiring errors.
Optionally, in record system busbar before the information with each feeder line, further include：Determine that metallicity list occurs for system
Mutually it is grounded.
Optionally it is determined that there are wiring errors to include for the zero sequence CT polarity for the feeder line selected：By the feeder line selected and reality
Ground path is compared, and in the case where the feeder line for determining to select not is ground path, determines the zero sequence CT for the feeder line selected
There are wiring errors for polarity.
Optionally, it after the zero sequence CT polarity for the feeder line for determining to select is there are wiring error, further includes：Exchange what is selected
The zero sequence CT polarity of feeder line.
Optionally, Δ is less than or equal to 75 °.
Another aspect according to embodiments of the present invention, additionally provides a kind of feeder line zero sequence current mutual inductor CT polarity school
Experiment device, including：Recording unit, under system electriferous state, for record system busbar the information with each feeder line, wherein,
Information includes the phase of zero-sequence current and the phase of residual voltage；Selecting unit, for according to information, selecting zero-sequence current lag
Feeder line in the range of 90 ° of ± Δs of phase of residual voltage；First determination unit, for determining the zero sequence CT polarity for the feeder line selected
There are wiring errors.
Optionally, which further includes：Second determination unit, for determining
Metallicity single-phase earthing occurs for system.
Optionally, the first determination unit includes：Comparing subunit, for the feeder line selected and practical ground path to be carried out
Compare；Determination subelement in the case of not being ground path in the feeder line for determining to select, determines the zero sequence of feeder line selected
There are wiring errors for CT polarity.
Optionally, which further includes：Unit is exchanged, is selected for exchanging
Feeder line zero sequence CT polarity.
Another aspect according to embodiments of the present invention, additionally provides a kind of microcomputer control device, including：Microcontroller,
Wave filtering circuit, photoelectric isolating circuit, switching value output circuit and On-off signal electricity output circuit：Sampling filter electricity
The input terminal connection busbar voltage circuit of sampling input and feeder line zero-sequence current circuit of sampling input on road, output terminal and microcontroller
Corresponding input terminal connection；The output terminal of switching value input circuit is connected by photoelectric isolating circuit input terminal corresponding with microcontroller
It connects；The output terminal of microcontroller is connected by the input terminal of photoelectric isolating circuit and switching value output circuit；Microcontroller, for being
It commands under electricity condition, information of the record system busbar institute with each feeder line, wherein, the phase and zero sequence of information including zero-sequence current are electric
The phase of pressure；According to information, the feeder line in the range of 90 ° of ± Δs of phase of zero-sequence current lag residual voltage is selected；It determines to select
The zero sequence CT polarity of feeder line there are wiring errors.
In embodiments of the present invention, system electrification in the state of, record system busbar the information with each feeder line, then
The feeder line in the range of 90 ° of ± Δs of phase of zero-sequence current lag residual voltage is selected according to these information, then determines the feedback selected
There are wiring errors for the zero sequence CT polarity of line, solve in the relevant technologies and feeder line zero sequence current mutual inductor CT polarity is verified accurately
Spend the technical issues of low.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and forms the part of the application, this hair
Bright illustrative embodiments and their description do not constitute improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of feeder line zero sequence current mutual inductor CT polarity check methods according to embodiments of the present invention；
Fig. 2 is the flow of optional feeder line zero sequence current mutual inductor CT polarity check methods according to embodiments of the present invention
Figure；
Fig. 3 is the schematic diagram of feeder line zero sequence current mutual inductor CT polarity calibration equipments according to embodiments of the present invention；And
Fig. 4 is the schematic diagram of microcomputer control device according to embodiments of the present invention.
Specific embodiment
In order to which those skilled in the art is made to more fully understand the present invention program, below in conjunction in the embodiment of the present invention
The technical solution in the embodiment of the present invention is clearly and completely described in attached drawing, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's all other embodiments obtained without making creative work should all belong to the model that the present invention protects
It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be the object for distinguishing similar, and specific sequence or precedence are described without being used for.It should be appreciated that it uses in this way
Data can be interchanged in the appropriate case, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment
Those steps or unit clearly listed, but may include not listing clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
In view of the above-mentioned problems, the embodiment use under system electriferous state, record system busbar the letter with each feeder line
Breath, wherein, information includes the phase of zero-sequence current and the phase of residual voltage, then according to information, selects zero-sequence current lag
Feeder line in the range of 90 ° of ± Δs of phase of residual voltage, then determine the zero sequence CT polarity of the feeder line selected there are wiring errors.Under
Mask body explanation.
According to embodiments of the present invention, a kind of method for providing feeder line zero sequence current mutual inductor CT polarity check methods is implemented
Example, it should be noted that step shown in the flowchart of the accompanying drawings can be in the calculating of such as a group of computer-executable instructions
It is performed in machine system, although also, show logical order in flow charts, it in some cases, can be to be different from
Sequence herein performs shown or described step.
Fig. 1 is the flow chart of feeder line zero sequence current mutual inductor CT polarity check methods according to embodiments of the present invention, such as Fig. 1
Shown, this method comprises the following steps：
Step S102, under system electriferous state, record system busbar the information with each feeder line, wherein, information includes
The phase of zero-sequence current and the phase of residual voltage.
Step S104 according to information, selects the feeder line in the range of 90 ° of ± Δs of phase of zero-sequence current lag residual voltage.
Step S106, determining the zero sequence CT polarity of the feeder line selected, there are wiring errors.
By above-mentioned steps, in the state of system electrification, record system busbar the information with each feeder line, then basis
These information select the feeder line in the range of 90 ° of ± Δs of phase of zero-sequence current lag residual voltage, then determine the feeder line selected
There are wiring errors for zero sequence CT polarity, solve in the relevant technologies and feeder line zero sequence current mutual inductor CT is carried out in the energized state
The technical issues of polarity verification accuracy is low.
In above-mentioned steps S102 to step S106, under system electriferous state, record system busbar with each feeder line
Information, wherein, information includes the phase of zero-sequence current and the phase of residual voltage, according to information, selects zero-sequence current lag zero
Feeder line in the range of 90 ° of ± Δs of phase of sequence voltage, determining the zero sequence CT polarity of the feeder line selected, there are wiring errors.
It is more accurate with the presence or absence of the judgement of wiring error to zero sequence CT polarity to cause, it is each in record system busbar institute band
Before the information of feeder line, feeder line zero sequence current mutual inductor CT polarity check methods can also include：Determine that metal occurs for system
Property single-phase earthing.
Specifically, it is determined that there are wiring errors to include for the zero sequence CT polarity for the feeder line selected：By the feeder line selected with
Practical ground path is compared, and in the case where the feeder line for determining to select not is ground path, determines the zero of feeder line selected
There are wiring errors for sequence CT polarity.Processing in this way can effectively determine that the zero sequence CT polarity for the feeder line selected exists
Wiring error.
In addition, the feeder line for determining to select zero sequence CT polarity there are wiring error after, can also include：To feeder line
There are wiring errors to be corrected for zero sequence CT polarity, for example, directly exchanging the zero sequence CT polarity for the feeder line selected.
It should be noted that Δ can be less than or equal to 75 °.
One complete embodiment of invention is described in detail below in conjunction with the accompanying drawings.
Under system electriferous state, single-phase earthing phase selection, route selection are carried out, and monitor the three-phase voltage and zero sequence of system busbar
The zero-sequence current of voltage and this section of busbar feeder, is calculated and is judged with computer software, judges whether system is sent out
Raw metallic earthing when judging that metallicity single-phase earthing occurs for system, records and shows each item feedback in etching system at this time at once
The phase of the amplitude of line zero-sequence current, phase and residual voltage, then, the phase of more each feeder line zero-sequence current and residual voltage
Position, it is ground path to select the zero-sequence current feeder line in the range of 90 ° of ± Δs (Δ≤75 °) of phase of lag residual voltage, then will
Select ground path and compare practical ground path, find out it is wherein non-be actually grounded select circuit, and when checking the line fault
The zero-sequence current at quarter and the phase relation of residual voltage, if the phase relation of zero-sequence current lag residual voltage, then can determine that
The circuit zero sequence CT polarity wiring errors, then redefine the feeder line zero sequence CT polarity by computer software, that is, complete band
Electricity corrects the checksum error of the feeder line zero sequence CT polarity.
Fig. 2 is the flow of optional feeder line zero sequence current mutual inductor CT polarity check methods according to embodiments of the present invention
Figure, specifically, as shown in Fig. 2, this method may include steps of：
Step S202, single-phase earthing phase selection, route selection.
Step S204, judges whether system occurs metallic earthing.Where it has, perform step S206；No
In the case of, perform step S214.
Step S206, the amplitude and phase of each feeder line zero-sequence current in display system.
Step S208 judges to lag whether residual voltage meets 90 ° of ± Δs.Where it has, perform step S210；
In the case of no, step S214 is performed.
Step S210 determines whether non-practical ground path.Where it has, perform step S212；In no feelings
Under condition, step S214 is performed.
Step S212 exchanges former CT polarity definition.
Step S214 terminates.
The embodiment of the present application additionally provides a kind of feeder line zero sequence current mutual inductor CT polarity calibration equipments, needs what is illustrated
It is that the feeder line zero sequence current mutual inductor CT polarity calibration equipments of the embodiment of the present application can be used for execution the embodiment of the present application and be carried
What is supplied is used for feeder line zero sequence current mutual inductor CT polarity check methods.Below to feeder line zero-sequence current provided by the embodiments of the present application
Mutual inductor CT polarity calibration equipments are introduced.
Fig. 3 is the schematic diagram of feeder line zero sequence current mutual inductor CT polarity calibration equipments according to embodiments of the present invention, such as Fig. 3
Shown, which includes：Recording unit 31, selecting unit 32 and first determine
Unit 33.The feeder line zero sequence current mutual inductor CT polarity calibration equipments are described in detail below.
Recording unit 31, under system electriferous state, for record system busbar the information with each feeder line, wherein, letter
Breath includes the phase of zero-sequence current and the phase of residual voltage.
Selecting unit 32, for according to information, selecting zero-sequence current and lagging in the range of 90 ° of ± Δs of phase of residual voltage
Feeder line.
First determination unit 33, for determining the zero sequence CT polarity for the feeder line selected, there are wiring errors.
By above-described embodiment, using recording unit 31, under system electriferous state, record system busbar institute is with each feeder line
Information, wherein, the phase of information including zero-sequence current and the phase of residual voltage, then, using selecting unit 32 according to letter
Breath selects the feeder line in the range of 90 ° of ± Δs of phase of zero-sequence current lag residual voltage, the first determination unit 33 is recycled to determine
There are wiring errors for the zero sequence CT polarity for the feeder line selected, and solve in the relevant technologies in the energized state to feeder line zero-sequence current
Mutual inductor CT carries out the technical issues of polarity verification accuracy is low.
It should be noted that the feeder line zero sequence current mutual inductor CT polarity calibration equipment can also include：Second determines list
Member, for determining that metallicity single-phase earthing occurs for system.
In addition, the first determination unit can include：Comparing subunit, for by the feeder line selected and practical ground path into
Row compares；Determination subelement in the case of not being ground path in the feeder line for determining to select, determines the zero of feeder line selected
There are wiring errors for sequence CT polarity.
Specifically, which further includes：Unit is exchanged, is selected for exchanging
Feeder line zero sequence CT polarity.
Another aspect according to embodiments of the present invention, additionally provides a kind of microcomputer control device, microcomputer measuring and controlling dress
Put including：Microcontroller, wave filtering circuit, photoelectric isolating circuit, switching value output circuit and the output of On-off signal electricity
Circuit：The input terminal connection busbar voltage circuit of sampling input and feeder line zero-sequence current circuit of sampling input of wave filtering circuit,
Output terminal is connected with the corresponding input terminal of microcontroller；The output terminal of switching value input circuit passes through photoelectric isolating circuit and microcontroller
Corresponding input terminal connection；The output terminal of microcontroller is connected by the input terminal of photoelectric isolating circuit and switching value output circuit；
Microcontroller, under system electriferous state, information of the record system busbar institute with each feeder line, wherein, it is electric that information includes zero sequence
The phase of stream and the phase of residual voltage；According to information, in the range of the 90 ° of ± Δs of phase for selecting zero-sequence current lag residual voltage
Feeder line；Determining the zero sequence CT polarity of the feeder line selected, there are wiring errors.
One complete embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
The microcomputer control device is from voltage transformer secondary side acquisition system busbar three-phase voltage, residual voltage, from feeder line
The secondary side of zero sequence CT acquires the zero-sequence current of each feeder line, judges system running state, when judge system occur single-phase earthing
During failure, can distinguish nature of trouble whether metallic earthing, each feeder line zero-sequence current is then shown for metallic earthing
Amplitude and phase select the feeder line number for wherein lagging residual voltage 90 ° of ± Δs of phase, for the practical ground path of artificial contrast, if
When determining to select circuit as non-practical ground path, then former CT polarity sets can be exchanged in the circuit setting, complete CT poles
The on-line testing of property and corrigendum, in addition, the microcomputer control device also has the function of automated communication.Fig. 4 is according to of the invention real
Apply the schematic diagram of the microcomputer control device of example, it should be noted that as shown in figure 4, the Ua of bus-bar potential transformer secondary terminals,
Ub, Uc, 3Uo, Un are respectively connected to microcomputer control device corresponding voltage input terminal, the secondary terminals of system feeder line zero sequence CT
(Io1 ‥ ‥ ‥ Ion) is respectively connected to the corresponding current input terminal of microcomputer control device；Microcomputer control device can by industry control
Computer or single-chip microprocessor system composition processed, including wave filtering circuit, photoelectric isolating circuit, switching value output circuit, switch
Input circuit, the input connection busbar voltage circuit of sampling input of wave filtering circuit and zero-sequence current circuit of sampling input are measured,
Its output is connected with the corresponding input terminal of microcontroller, and the output terminal of switching value input circuit passes through photoelectric isolating circuit and microcontroller
Corresponding input terminal is connected, and the output terminal of microcontroller is connected by photoelectric isolating circuit with the input terminal of switching value output circuit,
In addition, the microcontroller is also associated with keyboard and display.
The side of electrification verification distribution network feeder zero sequence CT polarity verifications is proposed and realized by the above embodiment of the present invention
Method and device solve the feeder line zero sequence CT polarity wiring errors of generally existing, cause small current earthing wire-selecting accuracy rate low
Problem, the route selection accuracy rate of isolated neutral system singlephase earth fault can be improved, timely isolated fault is influenced
Range is reduced to minimum, for ensureing public's Electrical Safety, safeguarding that personal property is significant from singlephase earth fault infringement；Together
When the embodiment of the present invention can be completed under not blackout condition feeder line zero sequence CT polarity verification and incorrect polarity corrigendum, for improve
Power supply reliability has apparent economic benefit and social benefit.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
In the above embodiment of the present invention, all emphasize particularly on different fields to the description of each embodiment, do not have in some embodiment
The part of detailed description may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, such as the division of the unit, Ke Yiwei
A kind of division of logic function, can there is an other dividing mode in actual implementation, for example, multiple units or component can combine or
Person is desirably integrated into another system or some features can be ignored or does not perform.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module
It connects, can be electrical or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical unit, you can be located at a place or can also be distributed to multiple
On unit.Some or all of unit therein can be selected according to the actual needs to realize the purpose of this embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
That each unit is individually physically present, can also two or more units integrate in a unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and is independent product sale or uses
When, it can be stored in a computer read/write memory medium.Based on such understanding, technical scheme of the present invention is substantially
The part to contribute in other words to the prior art or all or part of the technical solution can be in the form of software products
It embodies, which is stored in a storage medium, is used including some instructions so that a computer
Equipment (can be personal computer, server or network equipment etc.) perform each embodiment the method for the present invention whole or
Part steps.And aforementioned storage medium includes：USB flash disk, read-only memory (ROM, Read-On ly Memory), arbitrary access
Memory (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can to store program code
Medium.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of feeder line zero sequence current mutual inductor CT polarity check methods, which is characterized in that including：
Under system electriferous state, information of the record system busbar institute with each feeder line, wherein, described information is including zero-sequence current
The phase of phase and residual voltage；
According to described information, the feeder line in the range of 90 ° of ± Δs of phase of zero-sequence current lag residual voltage is selected；
Determining the zero sequence CT polarity of the feeder line selected, there are wiring errors.
2. according to the method described in claim 1, it is characterized in that, record the system busbar the letter with each feeder line
Before breath, further include：
Determine that metallicity single-phase earthing occurs for the system.
3. according to the method described in claim 1, it is characterized in that, determine that the zero sequence CT polarity for the feeder line selected is wrong there are wiring
Accidentally include：
The feeder line selected with practical ground path is compared, is not ground path in the feeder line for determining to select
In the case of, determining the zero sequence CT polarity of the feeder line selected, there are wiring errors.
4. according to the method described in claim 1, it is characterized in that, there are wiring in the zero sequence CT polarity of the feeder line for determining to select
After mistake, further include：
Exchange the zero sequence CT polarity for the feeder line selected.
5. method according to any one of claim 1 to 4, which is characterized in that Δ is less than or equal to 75 °.
6. a kind of feeder line zero sequence current mutual inductor CT polarity calibration equipments, which is characterized in that including：
Recording unit, under system electriferous state, for record system busbar the information with each feeder line, wherein, described information
The phase of phase and residual voltage including zero-sequence current；
Selecting unit, for according to described information, selecting the feedback in the range of 90 ° of ± Δs of phase of zero-sequence current lag residual voltage
Line；
First determination unit, for determining the zero sequence CT polarity for the feeder line selected, there are wiring errors.
7. device according to claim 6, which is characterized in that further include：
Second determination unit, for determining that metallicity single-phase earthing occurs for the system.
8. device according to claim 6, which is characterized in that first determination unit includes：
Comparing subunit, for the feeder line selected to be compared with practical ground path；
Determination subelement in the case of not being ground path in the feeder line for determining to select, determines the feeder line selected
There are wiring errors for zero sequence CT polarity.
9. device according to claim 6, which is characterized in that further include：
Unit is exchanged, for exchanging the zero sequence CT polarity for the feeder line selected.
10. a kind of microcomputer control device, which is characterized in that including：Microcontroller, wave filtering circuit, photoelectric isolating circuit, switch
Measure output circuit and On-off signal electricity output circuit：
The input terminal connection busbar voltage circuit of sampling input of the wave filtering circuit and feeder line zero-sequence current sampling input electricity
Road, output terminal are connected with the corresponding input terminal of the microcontroller；The output terminal of the switching value input circuit passes through the photoelectricity
Isolation circuit input terminal connection corresponding with the microcontroller；The output terminal of the microcontroller by the photoelectric isolating circuit with
The input terminal connection of the switching value output circuit；
The microcontroller, under system electriferous state, record the system busbar the information with each feeder line, wherein, institute
It states information and includes the phase of zero-sequence current and the phase of residual voltage；According to described information, zero-sequence current lag zero sequence electricity is selected
Feeder line in the range of 90 ° of ± Δs of phase of pressure；Determining the zero sequence CT polarity of the feeder line selected, there are wiring errors.
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| CN201711326422.8A CN108196214A (en) | 2017-12-12 | 2017-12-12 | Feeder line zero sequence current mutual inductor CT polarity check methods and device |
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| CN201711326422.8A CN108196214A (en) | 2017-12-12 | 2017-12-12 | Feeder line zero sequence current mutual inductor CT polarity check methods and device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061376A (en) * | 2018-09-19 | 2018-12-21 | 上海蓝瑞电气有限公司 | A kind of judgment method of Small Electric Current Earthing And Routing Device CT incorrect polarity |
| CN109980614A (en) * | 2019-03-29 | 2019-07-05 | 广东电网有限责任公司 | A kind of distribution line zero-sequenceprotection direction-adaptive method of discrimination |
| CN110927631A (en) * | 2019-12-03 | 2020-03-27 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
| CN111812452A (en) * | 2020-06-11 | 2020-10-23 | 国电南瑞科技股份有限公司 | CT polarity self-correction method and system for low-current grounding line selection device |
| CN112240992A (en) * | 2020-09-30 | 2021-01-19 | 中国南方电网有限责任公司 | Protection polarity verification method, device and equipment based on line empty charge transient current |
| CN114200354A (en) * | 2022-02-16 | 2022-03-18 | 广东电网有限责任公司肇庆供电局 | Zero sequence CT polarity online detection method, system and equipment |
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| CN110927631A (en) * | 2019-12-03 | 2020-03-27 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
| CN110927631B (en) * | 2019-12-03 | 2022-01-11 | 陕西省地方电力（集团）有限公司宝鸡供电分公司 | Polarity judgment method for zero-sequence current transformer |
| CN111812452A (en) * | 2020-06-11 | 2020-10-23 | 国电南瑞科技股份有限公司 | CT polarity self-correction method and system for low-current grounding line selection device |
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| CN112240992B (en) * | 2020-09-30 | 2022-08-30 | 中国南方电网有限责任公司 | Protection polarity verification method, device and equipment based on line empty charge transient current |
| CN114200354A (en) * | 2022-02-16 | 2022-03-18 | 广东电网有限责任公司肇庆供电局 | Zero sequence CT polarity online detection method, system and equipment |
| CN114200354B (en) * | 2022-02-16 | 2022-04-19 | 广东电网有限责任公司肇庆供电局 | Zero sequence CT polarity online detection method, system and equipment |
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