CN103746361A - Ultra/extra-high voltage power transmission line secondary arc suppression circuit and method thereof - Google Patents
Ultra/extra-high voltage power transmission line secondary arc suppression circuit and method thereof Download PDFInfo
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- CN103746361A CN103746361A CN201310707331.4A CN201310707331A CN103746361A CN 103746361 A CN103746361 A CN 103746361A CN 201310707331 A CN201310707331 A CN 201310707331A CN 103746361 A CN103746361 A CN 103746361A
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Abstract
The invention relates to an ultra/extra-high voltage power transmission line secondary arc suppression circuit and a method thereof. The ultra/extra-high voltage power transmission line secondary arc suppression circuit comprises high-voltage parallel-connected electric reactors Lp, a small electric reactor Ln, an electric reactor L1, an electric reactor L2, a breaker K1 and a breaker K2. An A-phase, a B-phase and a C-phase of an ultra and extra-high voltage power transmission line are respectively connected with the high-voltage parallel-connected electric reactors Lp. A neutral point is grounded via the small electric reactor Ln. One end of the breaker K1 is connected in series with one end of the electric reactor L1, and the other end of the breaker K1 is connected with one end of the small electric reactor Ln. The other end of the electric reactor L1 is grounded. One end of the breaker K2 is connected in series with one end of the electric reactor L2, and the other end of the breaker K2 is connected with one end of the small electric reactor Ln. The other end of the electric reactor L2 is grounded. When a grounding fault occurs in the B-phase of the power transmission line, the breaker K1 and the breaker K2 are maintained to be disconnected. When a single-phase grounding fault occurs in the power transmission line, the state of the switches of the breakers K1 and K2 is confirmed along with the fault phases. The three phases of the power transmission line are fully compensated via changing inductance among the phases of the power transmission line so that a secondary arc of the line can be effectively suppressed and stability of the system can be enhanced.
Description
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Technical field
The present invention is mainly used in ultra-high/extra-high voltage AC transmission system, and having what relate to is that a kind of ultra-high/extra-high voltage transmission line is dived for inhibition circuit and the method thereof of electric arc.
Background technology
For improving the stability of a system and power supply reliability, single phase autoreclosing technology is applied widely on ultra-high/extra-high voltage circuit.For ultra-high/extra-high voltage transmission line, due to circuit distance, working voltage is high, dive for electric arc to extinguish fast with effective inhibition be a technical barrier always.If dive, for electric arc, can not extinguish in time, will make circuit breaker coincide with arc grounding fault, cause unsuccessful reclosing, may cause system unstability.
At present, dive and have for the main inhibition method of electric arc: high-voltage shunt reactor neutral point adds little reactance, circuit both sides are installed high speed grounding switch, adopt hybrid triggering tripping operation mode, by circuit subregion or installing switchyard, reduced line length etc.On the basis of the above, there is again a series of corrective measure.For example, for extra high voltage network, adopt controlled high resistance mode, by changing the value of reactor to adapt to different operating conditions, when meeting System Reactive Power balance, effectively suppress to dive for electric arc; For same tower double back transmission line, can adopt different shunt reactor connection type compensation to perfect the impact of loop on fault loop fault phase, realizing dives supplies extinguishing fast of electric arc etc.
Current, the mode that shunt reactor neutral point adds little reactance (resistance of general little reactance Ln is 500～1000 Ω) in ultra-high/extra-high voltage transmission line is most widely used.But, for the transmission line that does not replace or not exclusively replace, because three-phase is asymmetric, respectively relatively electric capacity and capacitive coupling are unequal, existing shunt reactor neutral point adds little reactance scheme cannot realize the full compensation of each phase capacitive coupling, and while making part phase fault, secondary arc current value may be very high, electric arc is difficult to extinguish, and must improve.
Summary of the invention
For the deficiency existing in prior art, the object of the invention provides a kind of ultra-high/extra-high voltage transmission line to dive for arc suppressing circuit and method thereof, mainly for not replacing or incomplete transposed transmission line, when circuit generation single phase ground fault, realize the full compensation of each phase capacitive coupling, while making part phase fault, effectively limiting circuitry is dived for electric arc, realizing dives supplies extinguishing fast of electric arc, improves the stability of system.
For achieving the above object, technical scheme of the present invention is as follows:
Ultra-high/extra-high voltage transmission line is dived for the inhibition circuit of electric arc, it is characterized in that, it comprises high-voltage shunt reactor L
p, the little reactance L of neutral point
n, reactor L
1, reactor L
2, circuit breaker K
1, circuit breaker K
2; At super, transmission line A, the B of ultra high voltage, C, go up mutually and be connected with respectively described high-voltage shunt reactor L
p, the high-voltage shunt reactor L going up mutually at transmission line B
pthe little reactance L of upper connection
none end; Described little reactance L
nother end ground connection, neutral point is by little reactance L
nground connection; Described circuit breaker K
1one end and reactor L
1one end be connected in series, its other end connects described little reactance L
none end, described reactor L
1other end ground connection; Described circuit breaker K
2one end and reactor L
2one end be connected in series, its other end connects described little reactance L
none end, described reactor L
2other end ground connection; Under normal circumstances, circuit breaker K
1, K
2in off-state.When transmission line generation single phase ground fault, circuit breaker K
1, K
2on off state with fault phase, determine, entirely by changing transmission line alternate inductance value, transmission line three-phase is realized compensate.
A kind of ultra-high/extra-high voltage transmission line that utilizes above-mentioned inhibition circuit is dived for electric arc inhibition method, its method is, first, by loop equivalent transformation, make wherein a certain compensation entirely mutually in three phase line, be A, B capacitive coupling value, B, C capacitive coupling value inductance value alternate with A, B, the alternate inductance value parameter of B, C equate; Now, when B mutually single phase ground fault occurs, corresponding secondary arc current and recovery voltage value minimum, calculate and obtain now little reactance L
nvalue.
Under normal circumstances, circuit breaker K
1, K
2in off-state, to circuit, operation does not exert an influence;
When there is earth fault mutually in transmission line B, circuit breaker K
1, K
2remain open state;
When there is earth fault mutually in transmission line A, circuit breaker K
2remain open state, circuit breaker K1 closure, reactor L
1connect circuit; By loop equivalent transformation, make transmission line A, B capacitive coupling, transmission line A, C capacitive coupling, the alternate equivalent inductance of transmission line A, B, the alternate equivalent inductance parameter of transmission line A, C matches, now alternate inductance equates with capacitive coupling value, capacitive coupling is realized full compensation, calculates and obtains now reactor L
1value, the secondary arc current that now flows through transmission line A phase fault point is very little, dives and is effectively suppressed for electric arc;
When transmission line C mutually earth fault occurs, circuit breaker K1 remains open state, circuit breaker K
2closure, reactor L
2place in circuit, by loop equivalent transformation, calculates and obtains L
2value, now A, C capacitive coupling, B, C capacitive coupling, the alternate equivalent inductance of A, C, the alternate equivalent inductance parameter matching of B, C, now alternate inductance equates with capacitive coupling value, capacitive coupling is realized full compensation, and the secondary arc current that now flows through C phase fault point is very little, dives and is effectively suppressed for electric arc.
The present invention is mainly for not replacing or incomplete transposed transmission line.The method is simple in structure, and transmission line under normal circumstances is not exerted an influence.When circuit generation single phase ground fault, by rational parameter configuration, effectively limiting circuitry is dived for electric arc, improves the stability of system, and the present invention can be used as existing latent effectively supplementing for electric arc inhibition method.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, describe the present invention in detail;
Fig. 1 is of the present invention latent for electric arc braking measure topological structure circuit diagram.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.
Referring to Fig. 1, the present embodiment provides a kind of ultra-high/extra-high voltage transmission line and dives for arc suppressing circuit and method thereof, and mainly for not replacing or incomplete transposed transmission line, its structure is: suppress circuit and comprise high-voltage shunt reactor L
p, the little reactance of neutral point
l n, reactor
l 1, reactor L
2, circuit breaker K
1, circuit breaker K
2.At super, transmission line A, the B of ultra high voltage, C, go up mutually and be connected with respectively high-voltage shunt reactor L
p, the high-voltage shunt reactor L going up mutually at transmission line B
pon be connected with little reactance L
n; Described little reactance L
nthe high-voltage shunt reactor L that one end and transmission line B go up mutually
pone end is connected, its other end ground connection, and neutral point is by little reactance L
nground connection; Described circuit breaker K
1with reactor
l 1series connection, its two ends are connected with transmission line A, B; Described circuit breaker K
2with reactor L
2series connection, its two ends are connected with transmission line B, C.Under normal circumstances, circuit breaker K
1, K
2in off-state.When transmission line generation single phase ground fault, circuit breaker K
1, K
2on off state with fault phase, determine, entirely by changing transmission line alternate inductance value, transmission line three-phase is realized compensate.
The present embodiment is when transmission line generation single phase ground fault, perfects and by electrostatic coupling and electromagnetic coupled, fault phase is powered, and will continue current flowing in fault point, forms and dives for electric arc.Can equivalent compensation capacitive coupling by add little reactance at shunt reactor neutral point, reduce secondary arc current and recovery voltage value.Ideally, transmission line three-phase ground capacitance value, three-phase capacitive coupling value all equate, can realize the full compensation of each phase capacitive coupling by rational little reactance value is set.In Practical Project, due to condition restriction, normal appearance does not replace or incomplete transposition form, and while making part phase fault, secondary arc current value may be very high, and electric arc is difficult to extinguish.This programme installs two groups of reactors additional, and when transmission line normally moves, above-mentioned reactor is disconnected circuit, and circuit is not impacted.After transmission line breaks down mutually, reactor L
1or L
2access, changes equivalent inductance parameter between circuit and, to realize the full compensation of each phase capacitive coupling, adds extinguishing of quick dive power supply arc.
The present embodiment utilizes above-mentioned ultra-high/extra-high voltage transmission line to dive for the inhibition method of arc suppressing circuit, and its method is as follows:
First, by loop equivalent transformation, make in three phase line wherein a certain phase (for example transmission line B phase) entirely compensate, i.e. A, B capacitive coupling value, B, C capacitive coupling value inductance value alternate with A, B, the alternate inductance value parameter of B, C equate; Now, when B mutually single phase ground fault occurs, corresponding secondary arc current and recovery voltage value minimum, calculate and obtain now little reactance L
nvalue.
Under normal circumstances, circuit breaker K
1, K
2in off-state, to circuit, operation does not exert an influence;
When there is earth fault mutually in transmission line B, circuit breaker K
1, K
2remain open state;
When there is earth fault mutually in transmission line A, circuit breaker K
2remain open state, circuit breaker K1 closure, reactor L
1connect circuit; By loop equivalent transformation, make transmission line A, B capacitive coupling, transmission line A, C capacitive coupling, the alternate equivalent inductance of transmission line A, B, the alternate equivalent inductance parameter of transmission line A, C matches, now alternate inductance equates with capacitive coupling value, capacitive coupling is realized full compensation, calculates and obtains now reactor L
1value, the secondary arc current that now flows through transmission line A phase fault point is very little, dives and is effectively suppressed for electric arc;
When transmission line C mutually earth fault occurs, circuit breaker K1 remains open state, circuit breaker K
2closure, reactor L
2place in circuit, by loop equivalent transformation, calculates and obtains L
2value, now A, C capacitive coupling, B, C capacitive coupling, the alternate equivalent inductance of A, C, the alternate equivalent inductance parameter matching of B, C, now alternate inductance equates with capacitive coupling value, capacitive coupling is realized full compensation, and the secondary arc current that now flows through C phase fault point is very little, dives and is effectively suppressed for electric arc.
The present invention is mainly for not replacing or incomplete transposed transmission line.The method is simple in structure, and transmission line under normal circumstances is not exerted an influence.When circuit generation single phase ground fault, by rational parameter configuration, effectively limiting circuitry is dived for electric arc, improves the stability of system.The present invention can be used as existing latent effectively supplementing for electric arc inhibition method.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (2)
1. ultra-high/extra-high voltage transmission line is dived for the inhibition circuit of electric arc, it is characterized in that, it comprises high-voltage shunt reactor L
p, the little reactance L of neutral point
n, reactor L
1, reactor L
2, circuit breaker K
1with circuit breaker K
2; At super, transmission line A, the B of ultra high voltage, C, go up mutually and be connected with respectively described high-voltage shunt reactor L
p, the high-voltage shunt reactor L going up mutually at transmission line B
pon be connected with described little reactance L
n; Described little reactance L
nthe high-voltage shunt reactor L that one end and transmission line B go up mutually
pone end is connected, its other end ground connection; Described circuit breaker K
1one end and reactor L
1one end be connected in series, described circuit breaker K
1the other end connects described little reactance L
none end, described reactor L
1other end ground connection; Described circuit breaker K
2one end and reactor L
2one end be connected in series, its other end connects described little reactance L
none end, described reactor L
2other end ground connection.
2. a ultra-high/extra-high voltage transmission line according to claim 1 is dived for the inhibition method of arc suppressing circuit, it is characterized in that, its method is: first, by loop equivalent transformation, make wherein a certain compensation entirely mutually in three phase line, be A, B capacitive coupling value, B, C capacitive coupling value inductance value alternate with A, B, the alternate inductance value parameter of B, C equate; Now, when B mutually single phase ground fault occurs, corresponding secondary arc current and recovery voltage value minimum, calculate and obtain now little reactance L
nvalue;
Under normal circumstances, circuit breaker K
1, K
2in off-state, to circuit, operation does not exert an influence;
When there is earth fault mutually in transmission line B, circuit breaker K
1, K
2remain open state;
When there is earth fault mutually in transmission line A, circuit breaker K
2remain open state, circuit breaker K1 closure, reactor L
1connect circuit; By loop equivalent transformation, make transmission line A, B capacitive coupling, transmission line A, C capacitive coupling, the alternate equivalent inductance of transmission line A, B, the alternate equivalent inductance parameter of transmission line A, C matches, now alternate inductance equates with capacitive coupling value, capacitive coupling is realized full compensation, calculates and obtains now reactor L
1value, the secondary arc current that now flows through transmission line A phase fault point is very little, dives and is effectively suppressed for electric arc;
When transmission line C mutually earth fault occurs, circuit breaker K1 remains open state, circuit breaker K
2closure, reactor L
2place in circuit, by loop equivalent transformation, calculates and obtains L
2value, now A, C capacitive coupling, B, C capacitive coupling, the alternate equivalent inductance of A, C, the alternate equivalent inductance parameter matching of B, C, now alternate inductance equates with capacitive coupling value, capacitive coupling is realized full compensation, and the secondary arc current that now flows through C phase fault point is very little, dives and is effectively suppressed for electric arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310707331.4A CN103746361B (en) | 2013-12-20 | 2013-12-20 | The suppression circuit and its method of Ultra/extra-high voltage power transmission line secondary arc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310707331.4A CN103746361B (en) | 2013-12-20 | 2013-12-20 | The suppression circuit and its method of Ultra/extra-high voltage power transmission line secondary arc |
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| Publication Number | Publication Date |
|---|---|
| CN103746361A true CN103746361A (en) | 2014-04-23 |
| CN103746361B CN103746361B (en) | 2017-03-29 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4367507A (en) * | 1981-07-10 | 1983-01-04 | Shperling Betsalel R | Apparatus for clearing faults on untransposed transmission lines using single phase switching |
| CN101635453A (en) * | 2009-08-20 | 2010-01-27 | 中国电力科学研究院 | Method and device for limiting secondary arc current of extra-high voltage same tower double circuit line |
| CN102510052A (en) * | 2011-12-01 | 2012-06-20 | 国网电力科学研究院 | Method for limiting secondary arc current for untransposed transmission line with extra-high voltage |
-
2013
- 2013-12-20 CN CN201310707331.4A patent/CN103746361B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4367507A (en) * | 1981-07-10 | 1983-01-04 | Shperling Betsalel R | Apparatus for clearing faults on untransposed transmission lines using single phase switching |
| CN101635453A (en) * | 2009-08-20 | 2010-01-27 | 中国电力科学研究院 | Method and device for limiting secondary arc current of extra-high voltage same tower double circuit line |
| CN102510052A (en) * | 2011-12-01 | 2012-06-20 | 国网电力科学研究院 | Method for limiting secondary arc current for untransposed transmission line with extra-high voltage |
Non-Patent Citations (1)
| Title |
|---|
| 孙秋芹等: "特高压线路熄灭潜供电弧的方法比较", 《电力自动化设备》 * |
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| CN103746361B (en) | 2017-03-29 |
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