CN105261269A - Simulation model restraining ferromagnetic resonance of power system - Google Patents
Simulation model restraining ferromagnetic resonance of power system Download PDFInfo
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- CN105261269A CN105261269A CN201510825002.9A CN201510825002A CN105261269A CN 105261269 A CN105261269 A CN 105261269A CN 201510825002 A CN201510825002 A CN 201510825002A CN 105261269 A CN105261269 A CN 105261269A
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- power system
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- transformer
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/181—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for electric and magnetic fields; for voltages; for currents
Abstract
The invention discloses a simulation model restraining ferromagnetic resonance of a power system, which comprises a three-phase power supply, three-phase voltage transformers PT connected onto buses A, B and C of the three-phase power supply, a voltmeter, an oscilloscope, and main transformers T connected onto the buses A, B and C, wherein the neutral points of the main transformers T are serially connected with a switch K and a resistor R and are then grounded; the neutral point of the three-phase power supply is connected with the voltmeter and is then grounded; the oscilloscope is connected with the voltmeter; and primary windings of the voltage transformers PT are connected to form a star shape and the neutral points are directly grounded. By adopting the above technical scheme, main reasons for exciting ferromagnetic resonance can be found out, ferromagnetic resonance excited in the case of three-phase non-synchronous closing, three-phase opening and single-phase grounding fault disappearing can be effectively restrained through turning on and turning off the switch K, and a theoretical basis is provided for judging happening of resonance and eliminating resonance for the real power system.
Description
Technical field
The present invention relates to a kind of electric power system model, particularly a kind of realistic model suppressing Analysis on Ferroresonance of Power System Based.
Background technology
In electric system, in order to monitor generating plant, substation bus bar voltage-to-ground, usually on generator or substation bus bar, be connected to voltage transformer (VT), and its winding is connected into star, neutral-point solid ground.Like this, when electrical network is subject to exciting of some disturbance, the exciting impedance of voltage transformer (VT) and the ground capacitance of system form nonlinear resonance loop, due to the difference of loop parameter and extraneous shooting conditions, may cause frequency division, fundamental frequency or high frequency ferro-resonance over-voltage.Through statistics, the ferro-resonance over-voltage that electromagnetic potential transformer causes be the most common in isolated neutral system, cause the accident maximum a kind of internal overvoltages.Resonance will cause system overvoltage on the one hand, jeopardizes weak insulator arrangement, causes flashover trip accident, even also can cause Explosion of on Arrester etc.; Resonance produces the very high excess current of multiple in PT on the other hand, will cause PT high-pressure side fuse fuse failure, PT overcurrent scaling loss or explosion accident.PT resonance problems is the serious threat safe and stable operation of electrical network, is also one of induced factor of some major accident in electric system.
Report is had during PT resonance problems in isolated neutral system in all parts of the country, as Chongqing Shi Ping transformer station once frequently PT resonance overvoltage occurred, blow PT high-tension fuse tens times, also there is PT resonance accident in Wan Zhouzhan, also repeatedly there is PT resonance overvoltage and cause PT to burn out accident in Chongqing electricity grid each power supply administration 10kV, 35kV system, in each net electric power saving system PT resonance accident also time have report.PT resonance problems has seriously threatened the safe and stable operation of electrical network, have impact on the reliability of power supply, is the potential safety hazard that power system stability is run, causes the very big attention of power department and researchist.
For solving the problem, the operating potential safety hazard of elimination power distribution network, improves the reliability of system, and the special reason to the generation of PT resonance and elimination resonance carry out modeling effort.
Summary of the invention
Object of the present invention is exactly the deficiency that will solve prior art problem, provides a kind of realistic model suppressing Analysis on Ferroresonance of Power System Based.
The object of the invention is by such technical scheme realize: a kind of realistic model suppressing Analysis on Ferroresonance of Power System Based, comprise three-phase supply and three the bus A being connected to three-phase supply, B, threephase potential transformer PT on C, also comprise voltage table and oscillograph, and be connected to A, B, main-transformer T on C tri-buses, ground connection after the neutral point tandem tap K of described main-transformer T and resistance R, ground connection after the neutral point connection voltage table of three-phase supply, described oscillograph is connected to voltage table, a winding of described voltage transformer pt is connected into star and neutral-point solid ground.
Further, described three buses A, B, C are connected to coil and capacitor then ground connection, change the length of transmission line of electricity in the mode of changing capacitance, namely change transmission line of electricity ground capacitance value.
Preferably, described three-phase supply is 10kV AC power.
Preferably, the model of described voltage transformer pt is JDZX16-10RG.
Preferably, the rated capacity 20VA of described voltage transformer pt, rated frequency 50Hz, rated current 2.8mA, specified phase voltage 5.77kV.
Owing to have employed technique scheme, the present invention has following advantage:
The present invention can verify that any incentive condition of busbar voltage fluctuation that causes all may excite ferroresonance, produce resonance overvoltage excess current, transmission line of electricity ground capacitance (i.e. transmission line length) can be found out, singlephase earth fault occurs and the moment of fault recovery is the main cause exciting ferroresonance, and three-phase breakers asynchronous closing, three-phase separating brake and singlephase earth fault effectively can be suppressed to disappear the ferroresonance excited by on-off switch K, what the present invention judged resonance for real electric system provides theoretical foundation.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or can be instructed from the practice of the present invention.Target of the present invention and other advantages can be realized by instructions below and claims and be obtained.
Accompanying drawing explanation
Accompanying drawing of the present invention is described as follows:
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, a kind of realistic model suppressing Analysis on Ferroresonance of Power System Based, comprise the three-phase supply 1 of 10kV and be connected to three bus A of three-phase supply, B, model on C is the threephase potential transformer PT of JDZX16-10RG, the rated capacity 20VA of described threephase potential transformer PT, rated frequency 50Hz, rated current 2.8mA, specified phase voltage 5.77kV, also comprise voltage table 2 and oscillograph 3, and be connected to A, B, main-transformer T on C tri-buses, ground connection after the neutral point tandem tap K of described main-transformer T and resistance R, the neutral point of three-phase supply 1 connects arc suppression coil 6 and the rear ground connection of voltage table 2 respectively, described oscillograph 3 is connected to voltage table 2, a winding of described threephase potential transformer PT is connected into star and neutral-point solid ground.Three-phase breakers asynchronous closing, three-phase separating brake and singlephase earth fault is effectively suppressed to disappear the ferroresonance excited by on-off switch K.
Further, at singlephase earth fault as the condition exciting resonance, three described bus A, B, C is connected to coil 4 and capacitor 5 then ground connection, LA in Fig. 1, LB, LC is three-phase line parameter, the length of transmission line of electricity is changed in the mode of changing capacitance, namely transmission line of electricity ground capacitance value is changed, it is saturated that singlephase earth fault excites lower voltage transformer (VT) to enter, inductance value reduces rapidly, continuous changing capacitance simultaneously, in the process, when inductance value be reduced to meet condition of resonance with transmission line of electricity ground capacitance value time, system produces ferro-resonance over-voltage and excess current.
Summary, the present invention enough verifies that any incentive condition of busbar voltage fluctuation that causes all may excite ferroresonance, produce resonance overvoltage excess current, transmission line of electricity ground capacitance (i.e. transmission line length) can be found out, singlephase earth fault occurs and moment of fault recovery is the main cause exciting ferroresonance, effectively suppress three-phase breakers asynchronous closing, three-phase separating brake and singlephase earth fault to disappear the ferroresonance excited by on-off switch K simultaneously.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of the technical program, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1. one kind is suppressed the realistic model of Analysis on Ferroresonance of Power System Based, comprise three-phase supply and be connected to the threephase potential transformer PT on three buses A, B, C of three-phase supply, it is characterized in that: also comprise voltage table and oscillograph, and the main-transformer T be connected on A, B, C tri-buses, ground connection after the neutral point tandem tap K of described main-transformer T and resistance R, ground connection after the neutral point connection voltage table of three-phase supply, described oscillograph is connected to voltage table, and a winding of described voltage transformer pt is connected into star and neutral-point solid ground.
2. a kind of realistic model suppressing Analysis on Ferroresonance of Power System Based as claimed in claim 1, is characterized in that: described three buses A, B, C are connected to coil and capacitor then ground connection.
3. a kind of realistic model suppressing Analysis on Ferroresonance of Power System Based as claimed in claim 1, is characterized in that: described three-phase supply is 10kV AC power.
4. a kind of realistic model suppressing Analysis on Ferroresonance of Power System Based as claimed in claim 1, is characterized in that: the model of described voltage transformer pt is JDZX16-10RG.
5. a kind of realistic model suppressing Analysis on Ferroresonance of Power System Based as claimed in claim 1, is characterized in that: the rated capacity 20VA of described voltage transformer pt, rated frequency 50Hz, rated current 2.8mA, specified phase voltage 5.77kV.
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| CN201510825002.9A CN105261269A (en) | 2015-11-24 | 2015-11-24 | Simulation model restraining ferromagnetic resonance of power system |
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| CN201510825002.9A CN105261269A (en) | 2015-11-24 | 2015-11-24 | Simulation model restraining ferromagnetic resonance of power system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107290624A (en) * | 2017-06-19 | 2017-10-24 | 武汉理工大学 | A kind of three-phase distribution circuit model suitable for non-effective earthing power distribution network |
| CN108020805A (en) * | 2018-01-09 | 2018-05-11 | 广东电网有限责任公司电力科学研究院 | The ferromagnetic resonance determination methods and system of a kind of voltage transformer for electric power distribution network |
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Application publication date: 20160120 |