CN109873413A - A kind of method that earth current is fully compensated in controllable current source cooperation arc suppression coil - Google Patents
A kind of method that earth current is fully compensated in controllable current source cooperation arc suppression coil Download PDFInfo
- Publication number
- CN109873413A CN109873413A CN201910259662.3A CN201910259662A CN109873413A CN 109873413 A CN109873413 A CN 109873413A CN 201910259662 A CN201910259662 A CN 201910259662A CN 109873413 A CN109873413 A CN 109873413A
- Authority
- CN
- China
- Prior art keywords
- arc suppression
- suppression coil
- current source
- phase
- earth
- 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.)
- Granted
Links
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The application discloses a kind of method that earth current is fully compensated in controllable current source cooperation arc suppression coil, and method includes: to detect the first neutral point voltage of each line voltage and detection when system operates normally；By the damping resistance short circuit of arc suppression coil concatenation；The second neutral point voltage is detected, the damping resistance short-circuit condition of arc suppression coil concatenation, computing system line-to-ground distribution impedance are released；According to system line, the electric current that should be exported when earth current is fully compensated in distribution impedance, controllable current source of the calculating when single-phase earthing occurs for each phase over the ground；Judge whether system occurs single-phase earthing；The damping resistance short circuit of arc suppression coil concatenation is determined into Earth Phase in case of single-phase earthing；Controllable current source output is grounded corresponding controllable current source and the electric current that should be exported when earth current is fully compensated.The application provides accurate controllable current source and is grounded the current output value that electric current compensates entirely in single-phase earthing, realizes that single-phase-to-ground current is fully compensated, it is easy to accomplish and engineer application.
Description
Technical field
This application involves the full compensation technique field of network system single-phase earthing more particularly to a kind of controllable voltage compensation ways
Ground fault disappearance method of discrimination.
Background technique
In network system, especially in low and medium voltage distribution network system, singlephase earth fault accounts for the absolute majority of failure sum.
When system capacitive current is more than certain numerical value, ground arc when singlephase earth fault occurs is unable to self-extinguish, generates arc light
Overvoltage and other secondary harms.China's low and medium voltage distribution network generallys use small current neutral grounding mode, including isolated neutral
Mode or neutral by arc extinction coil grounding mode.Isolated neutral run when, ground arc can not self-extinguish, Ren Yuanan
Complete and operational safety can not ensure.Under neutral by arc extinction coil grounding mode, nothing of the ground arc due to arc suppression coil compensation
The function function of current, partially can self-extinguish, but arc suppression coil is only capable of compensating reactive power electric current, and there are still ground connection residual flows after compensation.It is residual
Stream includes certain overcompensation induced current and watt current, there are still personnel's electric shock and leads to the risks such as fire.By to ground connection electricity
The full compensation of stream can achieve the purpose that extinguish electric arc completely and prevent Danger Electric shock risk, therefore zero current compensation method is that one kind can
The singlephase earth fault governing measure for the safety leaned on.
But it controllable current source can not accurately be provided in the prior art is grounded electric current in single-phase earthing and compensate entirely
Current output value.
Summary of the invention
It is existing to solve this application provides the method that earth current is fully compensated in a kind of controllable current source cooperation arc suppression coil
Controllable current source cannot accurately be provided by having in technology is grounded asking for current output value that electric current compensates entirely in single-phase earthing
Topic.
The application provides a kind of method that earth current is fully compensated in controllable current source cooperation arc suppression coil, the method packet
It includes:
When system operates normally, the first neutral point voltage of each line voltage and detection is detected；
By the damping resistance short circuit of arc suppression coil concatenation；
The second neutral point voltage is detected, the damping resistance short-circuit condition of arc suppression coil concatenation, computing system route pair are released
Ground distribution impedance；
According to the system line, distribution impedance, the controllable current source calculated when single-phase earthing occurs for each phase are complete over the ground
The electric current that should be exported when compensation of ground electric current；
Judge whether system occurs single-phase earthing；
The damping resistance short circuit of arc suppression coil concatenation is determined into Earth Phase in case of single-phase earthing；
Controllable current source exports the corresponding controllable current source of the ground connection and the electricity that should be exported when earth current is fully compensated
Stream.
Further, by following formula computing system line-to-ground distribution impedance:
Wherein: ZcFor system distribution impedance over the ground；
ZL1For the series impedance of arc suppression coil and damping resistance before damping resistance short circuit；
ZL2For arc suppression coil impedance after damping resistance short circuit；
E01For the first neutral point voltage；
E02For the second neutral point voltage.
Further, the controllable current source when single-phase earthing occurs for each phase is calculated by following formula and ground connection electricity is fully compensated
The electric current that should be exported when stream:
Wherein: I0For single-phase earthing occurs, the electric current that controllable current source when earth current is fully compensated should export；
K=0+j √ 1/3, k are constant；
UxIt is the line voltage between the two-phase except Earth Phase for system line voltage；
E02For the second neutral point voltage；
ZL2For arc suppression coil impedance after damping resistance short circuit；
ZcFor system distribution impedance over the ground.
Further, when single-phase earthing occurs for system, the concatenated damping resistance of arc suppression coil is by whole short circuits.
Further, the voltage of second neutral point is no more than the 15% of nominal voltage of a system.
As seen from the above embodiment, ground connection electricity is fully compensated in a kind of controllable current source cooperation arc suppression coil provided by the present application
The method of stream, which comprises when system operates normally, detect the first neutral point voltage of each line voltage and detection；It will
The damping resistance short circuit of arc suppression coil concatenation；The second neutral point voltage is detected, the damping resistance short circuit of arc suppression coil concatenation is released
State, computing system line-to-ground distribution impedance；According to the system line, distribution impedance, calculating occur single-phase in each phase over the ground
The electric current that should be exported when earth current is fully compensated in controllable current source when ground connection；Judge whether system occurs single-phase earthing；Such as
Single-phase earthing occurs for fruit, by the damping resistance short circuit of arc suppression coil concatenation, determines Earth Phase；Controllable current source exports the ground connection
The electric current that should be exported when earth current is fully compensated in corresponding controllable current source.The embodiment of the present application, which can provide, accurately may be used
Control current source is grounded the current output value that electric current compensates entirely in single-phase earthing, realizes that single-phase-to-ground current is fully compensated,
It is easily achieved and engineer application.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the side that a kind of controllable current source provided by the embodiments of the present application cooperates arc suppression coil full remuneration earth current
The flow chart of method；
Fig. 2 is application scenarios schematic diagram provided by the embodiments of the present application.
It illustrates:
Wherein 1- controllable current source, 2- voltage sensor, 3- computing unit, 4- arc suppression coil, 5- damping resistance, 6- damping
Resistance shorting switch, 7- grounding transformer, 8- system distribution capacity over the ground.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with the application specific embodiment and
Technical scheme is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only the application one
Section Example, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall in the protection scope of this application.Below in conjunction with attached drawing,
The technical scheme provided by various embodiments of the present application will be described in detail.
Fig. 2 is the application scenario diagram of the embodiment of the present application, the structure in Fig. 2 include controllable current source 1, voltage sensor 2,
Computing unit 3, arc suppression coil 4, damping resistance 5, damping resistance shorting switch 6, grounding transformer 7 and system distribution capacity over the ground
8。
As described in Figure 2, the embodiment of the present application provides a kind of controllable current source cooperation arc suppression coil full remuneration earth current
Method, which comprises
Step S101, when system operates normally, the first neutral point voltage of each line voltage and detection is detected；
Step S102, by the damping resistance short circuit of arc suppression coil concatenation；
Step S103, the second neutral point voltage is detected, the damping resistance short-circuit condition of arc suppression coil concatenation is released, calculates system
System line-to-ground distribution impedance；
Step S104, according to the system line, distribution impedance, calculating are controllable when single-phase earthing occurs for each phase over the ground
The electric current that should be exported when earth current is fully compensated in current source；
Step S105, judge whether system occurs single-phase earthing；
Step S106, the damping resistance short circuit of arc suppression coil concatenation is determined into Earth Phase in case of single-phase earthing；
Step S107, it is answered when earth current is fully compensated in the corresponding controllable current source of the controllable current source output ground connection
The electric current of output.
Further, by following formula computing system line-to-ground distribution impedance:
Wherein: ZcFor system distribution impedance over the ground；
ZL1For the series impedance of arc suppression coil and damping resistance before damping resistance short circuit；
ZL2For arc suppression coil impedance after damping resistance short circuit；
E01For the first neutral point voltage；
E02For the second neutral point voltage.
Further, the controllable current source when single-phase earthing occurs for each phase is calculated by following formula and ground connection electricity is fully compensated
The electric current that should be exported when stream:
Wherein: I0For single-phase earthing occurs, the electric current that controllable current source when earth current is fully compensated should export；
K=0+j √ 1/3, k are constant；
UxIt is the line voltage between the two-phase except Earth Phase for system line voltage；
E02For the second neutral point voltage；
ZL2For arc suppression coil impedance after damping resistance short circuit；
ZcFor system distribution impedance over the ground.
Further, when single-phase earthing occurs for system, the concatenated damping resistance of arc suppression coil is by whole short circuits.
Further, the voltage of second neutral point is no more than the 15% of nominal voltage of a system.
As seen from the above embodiment, ground connection electricity is fully compensated in a kind of controllable current source cooperation arc suppression coil provided by the present application
The method of stream, which comprises when system operates normally, detect the first neutral point voltage of each line voltage and detection；It will
The damping resistance short circuit of arc suppression coil concatenation；The second neutral point voltage is detected, the damping resistance short circuit of arc suppression coil concatenation is released
State, computing system line-to-ground distribution impedance；According to the system line, distribution impedance, calculating occur single-phase in each phase over the ground
The electric current that should be exported when earth current is fully compensated in controllable current source when ground connection；Judge whether system occurs single-phase earthing；Such as
Single-phase earthing occurs for fruit, by the damping resistance short circuit of arc suppression coil concatenation, determines Earth Phase；Controllable current source exports the ground connection
The electric current that should be exported when earth current is fully compensated in corresponding controllable current source.The embodiment of the present application, which can provide, accurately may be used
Control current source is grounded the current output value that electric current compensates entirely in single-phase earthing, realizes that single-phase-to-ground current is fully compensated,
It is easily achieved and engineer application.Those skilled in the art will be easy to think after considering specification and practicing application disclosed herein
To other embodiments of the application.This application is intended to cover any variations, uses, or adaptations of the application, these
Variations, uses, or adaptations follow the general principle of the application and undocumented in the art including the application
Common knowledge or conventional techniques.The description and examples are only to be considered as illustrative, the true scope and essence of the application
Mind is indicated by the following claims.
It should be understood that the application is not limited to the precise structure that has been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.Scope of the present application is only limited by the accompanying claims.
Claims (5)
1. a kind of method that earth current is fully compensated in controllable current source cooperation arc suppression coil, which is characterized in that the method packet
It includes:
When system operates normally, the first neutral point voltage of each line voltage and detection is detected；
By the damping resistance short circuit of arc suppression coil concatenation；
The second neutral point voltage is detected, the damping resistance short-circuit condition of arc suppression coil concatenation, computing system line-to-ground point are released
Cloth impedance；
According to the system line, distribution impedance, controllable current source of the calculating when single-phase earthing occurs for each phase are fully compensated over the ground
The electric current that should be exported when earth current；
Judge whether system occurs single-phase earthing；
The damping resistance short circuit of arc suppression coil concatenation is determined into Earth Phase in case of single-phase earthing；
Controllable current source exports the corresponding controllable current source of the ground connection and the electric current that should be exported when earth current is fully compensated.
2. the method that earth current is fully compensated in a kind of controllable current source cooperation arc suppression coil according to claim 1,
It is characterized in that, by following formula computing system line-to-ground distribution impedance:
Wherein: ZcFor system distribution impedance over the ground；
ZL1For the series impedance of arc suppression coil and damping resistance before damping resistance short circuit；
ZL2For arc suppression coil impedance after damping resistance short circuit；
E01For the first neutral point voltage；
E02For the second neutral point voltage.
3. the method that earth current is fully compensated in a kind of controllable current source cooperation arc suppression coil according to claim 1,
It is characterized in that, is answered when earth current is fully compensated by controllable current source of the following formula calculating when single-phase earthing occurs for each phase defeated
Electric current out:
Wherein: I0For single-phase earthing occurs, the electric current that controllable current source when earth current is fully compensated should export；
K=0+j √ 1/3, k are constant；
UxIt is the line voltage between the two-phase except Earth Phase for system line voltage；
E02For the second neutral point voltage；
ZL2For arc suppression coil impedance after damping resistance short circuit；
ZcFor system distribution impedance over the ground.
4. the method that earth current is fully compensated in a kind of controllable current source cooperation arc suppression coil according to claim 1,
It is characterized in that, when single-phase earthing occurs for system, the concatenated damping resistance of arc suppression coil is by whole short circuits.
5. the method that earth current is fully compensated in a kind of controllable current source cooperation arc suppression coil according to claim 1,
It is characterized in that, the voltage of second neutral point is no more than the 15% of nominal voltage of a system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910259662.3A CN109873413B (en) | 2019-04-02 | 2019-04-02 | Method for completely compensating grounding current by matching controllable current source with arc suppression coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910259662.3A CN109873413B (en) | 2019-04-02 | 2019-04-02 | Method for completely compensating grounding current by matching controllable current source with arc suppression coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109873413A true CN109873413A (en) | 2019-06-11 |
| CN109873413B CN109873413B (en) | 2020-04-24 |
Family
ID=66921920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910259662.3A Active CN109873413B (en) | 2019-04-02 | 2019-04-02 | Method for completely compensating grounding current by matching controllable current source with arc suppression coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109873413B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117747A (en) * | 2020-09-24 | 2020-12-22 | 云南电网有限责任公司电力科学研究院 | Ground fault current hybrid compensation system and matching method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1018185A1 (en) * | 1981-12-09 | 1983-05-15 | Институт Электродинамики Ан Усср | Apparatus for negative and zero phase-sequence currents neutralization in three-phase four-wire power network |
| CN101552466A (en) * | 2009-03-18 | 2009-10-07 | 中冶赛迪工程技术股份有限公司 | An arc-suppression coil grounding device for medium voltage network |
| CN104901299A (en) * | 2015-06-19 | 2015-09-09 | 安徽马尼特合开电器有限公司 | Resonant grounding system automatic tracking and compensating device and method |
| CN108448562A (en) * | 2018-05-25 | 2018-08-24 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation method of electric current based on singlephase earth fault and system |
-
2019
- 2019-04-02 CN CN201910259662.3A patent/CN109873413B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1018185A1 (en) * | 1981-12-09 | 1983-05-15 | Институт Электродинамики Ан Усср | Apparatus for negative and zero phase-sequence currents neutralization in three-phase four-wire power network |
| CN101552466A (en) * | 2009-03-18 | 2009-10-07 | 中冶赛迪工程技术股份有限公司 | An arc-suppression coil grounding device for medium voltage network |
| CN104901299A (en) * | 2015-06-19 | 2015-09-09 | 安徽马尼特合开电器有限公司 | Resonant grounding system automatic tracking and compensating device and method |
| CN108448562A (en) * | 2018-05-25 | 2018-08-24 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation method of electric current based on singlephase earth fault and system |
Non-Patent Citations (1)
| Title |
|---|
| 郭晓霞: "有源全补偿消弧装置中相似度故障选线技术研究", 《中国优秀硕士学位论文全文数据库》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117747A (en) * | 2020-09-24 | 2020-12-22 | 云南电网有限责任公司电力科学研究院 | Ground fault current hybrid compensation system and matching method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109873413B (en) | 2020-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109061372A (en) | A kind of controllable voltage source output voltage calculation method that ground fault compensates entirely | |
| CN108462162B (en) | A kind of multifunction flexible earthing or grounding means | |
| KR101052471B1 (en) | Neutral wire replacement device in power system and method | |
| CN109521322A (en) | A kind of offset voltage that controllable voltage source earth current compensates entirely determines method | |
| CN101950958A (en) | Capacitance-adjusting type arc suppression coil complete device and operation mod of same | |
| CN110261729A (en) | A kind of power distribution network flexible ground control method | |
| CN211701481U (en) | Arc extinguishing system | |
| CN109782116A (en) | A kind of full compensation device of earth current and method | |
| CN109873413A (en) | A kind of method that earth current is fully compensated in controllable current source cooperation arc suppression coil | |
| CN103944156A (en) | Grounding forecasting method of arc suppression coil grounding mode | |
| CN109449912A (en) | Neutral earthing devices and its control method | |
| CN105790213A (en) | Residual-current cancellation method and electric leakage protection device thereof | |
| CN109950886B (en) | Control method for controllable current source grounding full compensation with inductance compensation | |
| CN112858832A (en) | Large-current line selection method based on arc suppression coil grounding system | |
| CN109921404A (en) | A kind of full compensation device of controllable current source earth current and method | |
| CN109765418A (en) | A kind of controllable voltage source earth current compensates output voltage calculation method and device entirely | |
| CN110261720B (en) | Single-phase grounding judgment method and device for power distribution network grounding fault | |
| CN109765463A (en) | A kind of ground fault disappearance method of discrimination of controllable voltage compensation way | |
| CN109813997B (en) | Controllable current source grounding current full-compensation output current calculation method and system | |
| CN109980624A (en) | A kind of full compensation implementation method of controllable current source cooperation preset arc suppression coil | |
| CN109768538B (en) | Full compensation method and circuit for grounding of parallel controllable current source of arc suppression coil | |
| CN109921403A (en) | A kind of full compensation method of controllable current source ground fault of no inductance compensation | |
| KR101365290B1 (en) | Eco-friendly energy-saving power quality recovery equipment equipped switchboards | |
| CN109713654B (en) | Distributed flexible ground fault positioning and protecting method based on controllable voltage source | |
| CN108832609B (en) | A method of singlephase earth fault is solved based on turn-adjusting arc-extinguishing winding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |