CN102170121B - Resonance eliminator with correcting potential transformer - Google Patents
Resonance eliminator with correcting potential transformer Download PDFInfo
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- CN102170121B CN102170121B CN201110101084.4A CN201110101084A CN102170121B CN 102170121 B CN102170121 B CN 102170121B CN 201110101084 A CN201110101084 A CN 201110101084A CN 102170121 B CN102170121 B CN 102170121B
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Abstract
The invention discloses a resonance eliminator with a correcting potential transformer in the technical field of circuit designing of power systems. The resonance eliminator with the correcting potential transformer comprises the resonance eliminator for eliminating ferromagnetic resonance and the correcting potential transformer. The primary side of the correcting potential transformer is connected in parallel to the two ends of the resonance eliminator. The secondary side of the correcting potential transformer comprises a first winding, a second winding and a third winding. The front end of the first winding on the secondary side of the correcting potential transformer is connected with a neutral point of a Y-shaped measurement winding on the secondary side of a main potential transformer, and the tail end of the first winding on the secondary side of the correcting potential transformer is grounded. The front end of the second winding on the secondary side of the correcting potential transformer is connected with the neutral point of a Y-shaped protective winding on the secondary side of the main potential transformer, and the tail end of the second winding on the secondary side of the correcting potential transformer is grounded. The front end of the third winding on the secondary side of the correcting potential transformer is connected with the tail end of a residual winding, connected to form an open triangle, on the secondary side of the main potential transformer, and the tail end of the third winding on the secondary side of the correcting potential transformer is grounded. The resonance eliminator with the correcting potential transformer is formed by improving the conventional resonance eliminator, and solves the problems of voltage change errors which are produced when the neutral point of the primary side of the potential transformer is grounded by the resonance eliminator.
Description
Technical field
The invention belongs to the circuit design technique field of electric power system, relate in particular to a kind of resonance eliminator with revising voltage transformer.
Background technology
In electric system of neutral-piont earth free, when single phase ground fault occurring or when carrying out certain operation, may causing the ferro resonance of system, ferro resonance has many harm to the safe operation of system.
At present, voltage transformer (being called for short PT) primary side neutral point is the method that prevents that ferro resonance from the most often adopting through resonance eliminator ground connection.Voltage transformer primary side resonance eliminator is connected in series and forms with a linear resistance with fixed resistance value by non-linear resistor or its.When electrical network normally moves, resonance eliminator is high value, makes resonance be difficult for growing up in the starting stage.When intermittent arc grounding, nonlinear resistance can limit the discharging current of line capacitance to voltage transformer, and the unlikely voltage transformer that causes is saturated and ferro resonance occurs.But this working method causes changing directly ground connection into by directly grounded voltage transformer neutral point, thereby cause occurring in actual motion many problems.Specifically; owing to there being voltage on resonance eliminator; the Y winding of voltage transformer secondary side is measured less than its primary side A, B, C tri-virtual voltage relatively; be connected into the also fict residual voltage of voltage of the residue winding output of open delta mode; therefore can cause corresponding phase voltage and residual voltage to be measured and produce error; and further may cause that zero-sequenceprotection is posted a letter by mistake or do not posted a letter, malfunction or tripping, the safe operation of electric power system is threatened.
The present invention is directed to the problems referred to above that conventional resonance eliminator exists, a kind of resonance eliminator with revising voltage transformer is proposed, after this resonance eliminator is installed in electric power system, do not affect measurement performance and the accuracy of original relevant common voltage instrument transformer phase-to-ground voltage and residual voltage in electric power system.
Summary of the invention
The present invention is directed to conventional resonance eliminator can make the Y winding of voltage transformer secondary side measure less than its primary side three virtual voltage relatively, and the voltage that the residue winding that is connected into open delta mode is exported is the problem of fict residual voltage also, a kind of resonance eliminator with revising voltage transformer is proposed, for addressing the above problem.
For realizing object of the present invention, technical scheme provided by the invention is, a kind of resonance eliminator with revising voltage transformer, its one end is connected with the neutral point of principal voltage instrument transformer, other end ground connection, comprise for eliminating the resonance eliminator of ferro resonance and revising voltage transformer, it is characterized in that the former limit of described correction voltage transformer is connected in parallel on the two ends of resonance eliminator;
The secondary of revising voltage transformer comprises the first winding, the second winding and the tertiary winding;
Revising the head end of the first winding of voltage transformer secondary measures and is connected with the neutral point of winding with principal voltage instrument transformer secondary side Y shape, tail end ground connection;
The head end of revising the second winding of voltage transformer secondary is connected with the neutral point of winding with the protection of principal voltage instrument transformer secondary side Y shape, tail end ground connection;
The head end of revising the tertiary winding of voltage transformer secondary is connected with the tail end that principal voltage instrument transformer secondary side is connected into the residue winding of open-delta, revises the tail end ground connection of the tertiary winding of voltage transformer secondary.
Described resonance eliminator is non-linear resistor or is the linear resistance of fixed resistance value.
Described correction voltage transformer is single-phase potential transformer.
No-load voltage ratio between the former limit winding of described single-phase potential transformer and its secondary the first winding equals each phase voltage no-load voltage ratio of Y/Y winding of principal voltage instrument transformer.
No-load voltage ratio between the former limit winding of described single-phase potential transformer and its secondary the second winding equals each phase voltage no-load voltage ratio of Y/Y winding of principal voltage instrument transformer.
No-load voltage ratio between the former limit winding of described single-phase potential transformer and its secondary tertiary winding equals 1/3rd times of each phase voltage no-load voltage ratio of Y/ Δ winding of principal voltage instrument transformer.
The present invention is by improving existing resonance eliminator, solved the problem of the voltage transformation error that voltage transformer primary side neutral point causes when resonance eliminator ground connection, improved the accuracy of power system measuring and control.
Accompanying drawing explanation
Fig. 1 is the principle schematic that band is revised the resonance eliminator of voltage transformer;
Fig. 2 is that band is revised the resonance eliminator of voltage transformer and the elementary diagram of principal voltage instrument transformer;
Fig. 3 is the overall structure schematic diagram of the resonance eliminator of the band correction voltage transformer in actual use; Wherein, (a) being front view, is (b) vertical view.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that, following explanation is only exemplary, rather than in order to limit the scope of the invention and to apply.
Fig. 1 is the principle schematic that band is revised the resonance eliminator of voltage transformer.In Fig. 1, band is revised the resonance eliminator of voltage transformer, comprises for eliminating the resonance eliminator of ferro resonance and revising voltage transformer.Wherein, the former limit of correction voltage transformer is connected in parallel on the two ends of resonance eliminator.The secondary of revising voltage transformer comprises the first winding, the second winding and the tertiary winding.
Fig. 2 is that band is revised the resonance eliminator of voltage transformer and the elementary diagram of principal voltage instrument transformer.In Fig. 2, revise the head end 1 of the first winding of voltage transformer secondary and measure and be connected with the neutral point n1 of winding with principal voltage instrument transformer secondary side Y shape, tail end 1 ' ground connection.The head end 2 of revising the second winding of voltage transformer secondary is connected with the neutral point n2 of winding with the protection of principal voltage instrument transformer secondary side Y shape, 2 ' tail end ground connection; The head end 3 of revising the tertiary winding of voltage transformer secondary is connected with the tail end d that principal voltage instrument transformer secondary side is connected into the residue winding of open-delta, revises the tail end 3 ' ground connection of the tertiary winding of voltage transformer secondary.In above-mentioned annexation, the voltage between a1, b1, c1 and a2, b2, c2 and ground reflects respectively the voltage to earth of tested electric power system A, B, C three-phase, U
0and the voltage between ground reflects the residual voltage of tested electric power system.
Fig. 3 is the overall structure schematic diagram of the resonance eliminator of the band correction voltage transformer in actual use; Wherein, (a) being front view, is (b) vertical view.In Fig. 3, the N1 end on former limit and the NO end of resonance eliminator of revising voltage transformer are connected, revise the N1 ' end on former limit of voltage transformer and the other end n of resonance eliminator and hold and be connected, thereby the former limit of having realized correction voltage transformer and resonance eliminator is in parallel.Revise the head end separately of the first winding, the second winding and the tertiary winding of secondary of voltage transformer and tail end be respectively terminal 1,1 in Fig. 3 ', 2,2 ', 3,3 '.When installing and using, each terminal in Fig. 3 should require to be connected with principal voltage instrument transformer according to Fig. 2.
Usually, resonance eliminator is non-linear resistor or is the linear resistance of fixed resistance value.In the present invention, revising voltage transformer is single-phase potential transformer.Wherein, the first winding of correction voltage transformer secondary and the second winding are respectively used to compensate the measurement of principal voltage instrument transformer secondary side Y shape winding and Y shape protection winding; Revise the tertiary winding of voltage transformer secondary for compensating the residue winding that principal voltage instrument transformer secondary side is connected into open-delta.
In Fig. 2, each phase voltage no-load voltage ratio of the Y/Y winding of principal voltage instrument transformer is nominal transformation ratio, i.e. k
y=k
n, each phase no-load voltage ratio of the Y/ Δ winding of principal voltage instrument transformer is
wherein,
k
Y＝U
AR/U
ar＝U
BR/U
br＝U
CR/U
cr
k
Δ＝U
AR/U
ar′＝U
BR/U
br′＝U
CR/U
cr′。
, in revising voltage transformer, its former limit winding is k with being connected to the measurement of principal voltage instrument transformer secondary side Y shape by the no-load voltage ratio between the first winding of the correction voltage transformer of winding neutral point
r=k
n.Same, revising the former limit winding of voltage transformer and being connected to the protection of principal voltage instrument transformer secondary side Y shape is k by the no-load voltage ratio between the second winding of the correction voltage transformer of winding neutral point
r=k
n.The no-load voltage ratio of revising the former limit winding of voltage transformer and being connected between the tertiary winding of correction voltage transformer of residue winding of principal voltage instrument transformer secondary side is
wherein,
k
R＝U
R/U
r
k
R′＝U
R/(3U
r′)。
The derivation of above-mentioned conclusion is as follows:
First, derive and have three constraintss:
(1) in the situation that of the neutral-point solid ground of the former limit of voltage transformer, k
yvalue will guarantee that power system voltage when primary side is in specified and symmetrical situation time, voltage transformer secondary side line voltage is 100V, phase voltage is
k
Δvalue to guarantee that power system voltage at primary side is when specified and symmetrical situation issues raw Single Phase Metal ground connection, the voltage 100V of voltage transformer residue winding.
(2) in the situation that of the not direct ground connection of the former limit of voltage transformer neutral point (through equivalent impedance ground connection), k
yand k
rwhile guaranteeing that power system voltage when primary side is in asymmetric situation, through the line voltage change ratio of revised voltage transformer, equal phase voltage no-load voltage ratio and identical with the no-load voltage ratio in the former limit neutral-point solid ground of voltage transformer situation.
(3) in the situation that of the not direct ground connection of the former limit of voltage transformer neutral point (through equivalent impedance ground connection), k
Δwith k '
rvalue to guarantee that electric power system supply voltage is when specified and symmetrical situation issues raw Single Phase Metal ground connection, the voltage of revised voltage transformer residue winding equals 100V.
Obviously, in order to meet above-mentioned constraints (1), must guarantee k
y=k
n, k
nnominal transformation ratio for voltage transformer; In order to meet above-mentioned constraints (2), must guarantee k
ywith k
requate, and k
y=k
r=k
n.
Next, according to the requirement of above-mentioned condition (3) to k
Δand k
r' value derive.
See Fig. 2, in order to guarantee at the former limit of principal voltage instrument transformer neutral point directly ground connection (through equivalent impedance R ground connection) in the situation that, electric power system supply voltage is in specified and symmetrical situation, and while there is Single Phase Metal ground connection, revised principal voltage instrument transformer remains the output voltage 3U of winding
0' be 100V, must meet following derivation and result thereof, that is:
Thereby,
Further, from above-mentioned derivation, revise the former limit winding of voltage transformer and each phase voltage no-load voltage ratio of Y/Y winding that the no-load voltage ratio between its secondary the first winding equals principal voltage instrument transformer.Revise the former limit winding of voltage transformer and each phase voltage no-load voltage ratio of Y/Y winding that the no-load voltage ratio between its secondary the second winding equals principal voltage instrument transformer.Revise the former limit winding of voltage transformer and each phase voltage no-load voltage ratio of Y/ Δ winding that the no-load voltage ratio between its secondary tertiary winding equals principal voltage instrument transformer 1/3rd times.
The present invention is by improving existing resonance eliminator, effectively solved the problem of the voltage transformation error that voltage transformer primary side neutral point can cause when resonance eliminator ground connection.By at resonance eliminator two ends and connect correction voltage transformer, the Y winding by the voltage induced on resonance eliminator to principal voltage instrument transformer secondary, can obtain the real phase-to-ground voltage of tested electric power system; In like manner, the residue winding by the voltage induced on resonance eliminator to principal voltage instrument transformer secondary, can obtain the real residual voltage of tested electric power system.Therefore, the resonance eliminator that band is revised voltage transformer makes resonance eliminator and principal voltage instrument transformer can not be subject to the other side's interference, and when resonance eliminator can be eliminated ferro resonance well, the voltage signal of principal voltage instrument transformer secondary is not affected.Apparatus of the present invention are applicable to easily to occur access between the neutral point that common voltage instrument transformer is installed of ferro resonance electrical network and ground and use, and it can eliminate the ferro resonance of electric power system, does not affect again voltage measurement function and precision that primary voltage instrument transformer has.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (3)
1. one kind with the resonance eliminator of revising voltage transformer, its one end is connected with the neutral point of principal voltage instrument transformer, other end ground connection, comprises for eliminating the resonance eliminator of ferro resonance and revising voltage transformer, it is characterized in that the former limit of described correction voltage transformer is connected in parallel on the two ends of resonance eliminator;
The secondary of revising voltage transformer comprises the first winding, the second winding and the tertiary winding;
Revising the head end of the first winding of voltage transformer secondary measures and is connected with the neutral point of winding with principal voltage instrument transformer secondary side Y shape, tail end ground connection;
The head end of revising the second winding of voltage transformer secondary is connected with the neutral point of winding with the protection of principal voltage instrument transformer secondary side Y shape, tail end ground connection;
The head end of revising the tertiary winding of voltage transformer secondary is connected with the tail end that principal voltage instrument transformer secondary side is connected into the residue winding of open-delta, revises the tail end ground connection of the tertiary winding of voltage transformer secondary;
No-load voltage ratio between the former limit winding of described correction voltage transformer and its secondary the first winding equals each phase voltage no-load voltage ratio of Y/Y winding of principal voltage instrument transformer; No-load voltage ratio between the former limit winding of described correction voltage transformer and its secondary the second winding equals each phase voltage no-load voltage ratio of Y/Y winding of principal voltage instrument transformer;
No-load voltage ratio between the former limit winding of described correction voltage transformer and its secondary tertiary winding equals 1/3rd times of each phase voltage no-load voltage ratio of Y/ Δ winding of principal voltage instrument transformer;
The former limit winding of described correction voltage transformer and the no-load voltage ratio being connected between the tertiary winding of correction voltage transformer of residue winding of principal voltage instrument transformer secondary side are
wherein, nominal transformation ratio k
neach phase voltage no-load voltage ratio of Y/Y winding for principal voltage instrument transformer;
The first winding and the second winding of revising voltage transformer secondary are respectively used to compensate the measurement of principal voltage instrument transformer secondary side Y shape winding and Y shape protection winding;
Revise the tertiary winding of voltage transformer secondary for compensating the residue winding that principal voltage instrument transformer secondary side is connected into open-delta.
2. a kind of resonance eliminator with revising voltage transformer according to claim 1, is characterized in that described resonance eliminator is non-linear resistor or is the linear resistance of fixed resistance value.
3. a kind of resonance eliminator with revising voltage transformer according to claim 1, is characterized in that described correction voltage transformer is single-phase potential transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110101084.4A CN102170121B (en) | 2011-04-21 | 2011-04-21 | Resonance eliminator with correcting potential transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110101084.4A CN102170121B (en) | 2011-04-21 | 2011-04-21 | Resonance eliminator with correcting potential transformer |
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| Publication Number | Publication Date |
|---|---|
| CN102170121A CN102170121A (en) | 2011-08-31 |
| CN102170121B true CN102170121B (en) | 2014-10-29 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721891B (en) * | 2012-07-04 | 2015-01-14 | 宁夏电力公司电力科学研究院 | Test device for non-liner resistor type resonance eliminator |
| CN103248010A (en) * | 2013-04-27 | 2013-08-14 | 国家电网公司 | Method for suppressing phenomena of ferromagnetic resonance and fuse melting of voltage transformer |
| CN103323647B (en) * | 2013-06-07 | 2015-12-09 | 国家电网公司 | Graded insulation Electromagnetic PT primary side current monitoring device and method |
| CN116706839B (en) * | 2023-06-08 | 2024-02-06 | 深圳瑞能电气设备有限公司 | Microcomputer electric power resonance diagnosis eliminating device and eliminating method thereof |
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| CN2605579Y (en) * | 2003-02-26 | 2004-03-03 | 罗明览 | Single-phase grounding compensation detectnig apparatus |
| CN2750439Y (en) * | 2004-08-27 | 2006-01-04 | 大连经济技术开发区零序科技有限公司 | Anti-resonance and anti-oscillation voltage transformer |
| EP1684395A2 (en) * | 2005-01-19 | 2006-07-26 | Societe Nouvelle Transfix Toulon | Medium/low voltage transformer station |
| CN201601018U (en) * | 2009-12-14 | 2010-10-06 | 大连中广互感器制造有限公司 | Anti-resonant voltage transformer adaptable to plateau |
-
2011
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2605579Y (en) * | 2003-02-26 | 2004-03-03 | 罗明览 | Single-phase grounding compensation detectnig apparatus |
| CN2750439Y (en) * | 2004-08-27 | 2006-01-04 | 大连经济技术开发区零序科技有限公司 | Anti-resonance and anti-oscillation voltage transformer |
| EP1684395A2 (en) * | 2005-01-19 | 2006-07-26 | Societe Nouvelle Transfix Toulon | Medium/low voltage transformer station |
| CN201601018U (en) * | 2009-12-14 | 2010-10-06 | 大连中广互感器制造有限公司 | Anti-resonant voltage transformer adaptable to plateau |
Non-Patent Citations (2)
| Title |
|---|
| 电力系统中性点接地方式及铁磁谐振的消除;莫远凡;《广西师范学院学报(自然科学版)》;20070930;第24卷(第3期);第97-100页 * |
| 莫远凡.电力系统中性点接地方式及铁磁谐振的消除.《广西师范学院学报(自然科学版)》.2007,第24卷(第3期), |
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| CN102170121A (en) | 2011-08-31 |
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