CN205429727U - Simulation restraines 10kV electric wire netting three -phase ferroresonance's electric power system model - Google Patents
Simulation restraines 10kV electric wire netting three -phase ferroresonance's electric power system model Download PDFInfo
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- CN205429727U CN205429727U CN201520945753.XU CN201520945753U CN205429727U CN 205429727 U CN205429727 U CN 205429727U CN 201520945753 U CN201520945753 U CN 201520945753U CN 205429727 U CN205429727 U CN 205429727U
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- 238000004088 simulation Methods 0.000 title abstract 2
- 230000007935 neutral effect Effects 0.000 claims abstract description 11
- 230000005350 ferromagnetic resonance Effects 0.000 claims description 11
- 230000001629 suppression Effects 0.000 claims description 11
- 230000008030 elimination Effects 0.000 abstract description 2
- 238000003379 elimination reaction Methods 0.000 abstract description 2
- 238000000819 phase cycle Methods 0.000 abstract 1
- 230000000452 restraining effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model provides a simulation restraines 10kV electric wire netting three -phase ferroresonance's electric power system model, includes three phase current and connects the three -phase voltage transformer PT on three generating lines of three phase current, is connected with zero sequence resistance R or single -phase voltage transformer PT 1 between voltage transformer PT's once side neutral point and the earth. The utility model discloses zero sequence resistance R is connected with between voltage transformer PT's once side neutral point and the earth, when the single -phase ground connection of system, the zero phase -sequence impedance that voltage transformer PT once inclined will be increases to resonance can be eliminated simultaneously to the electric current that restriction voltage transformer once inclined, be connected with single -phase voltage transformer PT 1 between voltage transformer PT's once side neutral point and the earth, when the single -phase ground connection of system, impulse current that the voltage transformer PT branch road bore will reduce to original 14 to restraining resonance overvoltage overcurrent effectively, the utility model discloses can guarantee the operation of the safe and reliable of system and will play a positive role to effective elimination electric wire netting resonance.
Description
Technical field
This utility model relates to a kind of electric power system model, a kind of electric power system model simulating suppression 10kV electrical network three-phase ferromagnetic resonance.
Background technology
In power system, in order to monitor power plant, substation bus bar voltage-to-ground, on electromotor or substation bus bar, generally it is connected to voltage transformer, and its winding is connected into star, neutral-point solid ground.So, when electrical network is excited by some disturbance, the exciting impedance of voltage transformer forms nonlinear resonance loop with the direct-to-ground capacitance of system, due to loop parameter and the difference of extraneous shooting condition, is likely to result in frequency dividing, fundamental frequency or high frequency ferro-resonance over-voltage.Through statistics, the ferro-resonance over-voltage that electromagnetic potential transformer causes be most common in isolated neutral system, cause the accident most a kind of internal overvoltages.On the one hand resonance will cause system overvoltage, jeopardizes weak isolating equipment, causes flashover trip accident, even also result in Explosion of on Arrester etc.；On the other hand resonance produces the overcurrent that multiple is the highest in PT, it will cause PT high-pressure side fuse fuse failure, PT to cross stream scaling loss or explosion accident.The PT resonance problems serious threat safe and stable operation of electrical network, is also one of induced factor of some major accident in power system.
Isolated neutral system in all parts of the country has been reported that during PT resonance problems, as Chongqing Shi Ping transformer station the most frequently occurs PT resonance overvoltage, blow PT high-tension fuse tens times, also there is PT resonance accident in Wan Zhouzhan, Chongqing electricity grid each power supply administration 10kV, 35kV system the most repeatedly occurs PT resonance overvoltage to cause PT to burn out accident, in each net electric power saving system PT resonance accident also time have been reported that.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 of power system stability operation, causes the very big attention of power department and research worker.
For solving the problems referred to above, eliminating the operating potential safety hazard of power distribution network, improve the reliability of system, spy is simulated research to PT resonance and braking measure.
Utility model content
The purpose of this utility model seeks to solve the deficiency of prior art problem, it is provided that a kind of electric power system model simulating suppression 10kV electrical network three-phase ferromagnetic resonance.
The purpose of this utility model is realized by such technical scheme: a kind of electric power system model simulating suppression 10kV electrical network three-phase ferromagnetic resonance, including three phase mains and the threephase potential transformer PT being connected on three buses of three phase mains, it is connected between the primary side neutral point of described voltage transformer pt with the earth and has zero sequence resistance R or single-phase potential transformer PT1.
Further, described resistance R is nonlinear resistance.
Further, resistance 14 Ω ＜ R≤50 Ω of described resistance R.
As preferred version of the present utility model, the model of described voltage transformer pt is JDZX16-10RG.
As preferred version of the present utility model, 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, this utility model has the advantage that
It is connected between the primary side neutral point and the earth of voltage transformer pt and has zero sequence resistance R, when system generation single-phase earthing, the zero sequence impedance of voltage transformer pt primary side will be increased, thus limit the electric current of voltage transformer primary side, resonance can be eliminated simultaneously；Being connected between the primary side neutral point of voltage transformer pt with the earth and have single-phase potential transformer PT1, when system generation single-phase earthing, the dash current that voltage transformer pt branch road bears will be reduced to original 1/4, thus effectively suppresses resonance overvoltage overcurrent；This utility model can be for effectively eliminating electrical network resonance, it is ensured that security of system reliability service will be played a positive role.
Other advantages of the present utility model, target and feature will be illustrated to a certain extent in the following description, and to a certain extent, will be apparent to those skilled in the art based on to investigating hereafter, or can be instructed from practice of the present utility model.Target of the present utility model and other advantages can be realized by description below and claims and obtain.
Accompanying drawing explanation
Accompanying drawing of the present utility model is described as follows:
Fig. 1 is the circuit diagram of a kind of embodiment of the present utility model；
Fig. 2 is the circuit diagram of another embodiment of the present utility model.
Detailed description of the invention
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
In Fig. 1 and Fig. 2, EA, EBAnd ECFor three phase mains electromotive force.
As shown in Figure 1, a kind of electric power system model simulating suppression 10kV electrical network three-phase ferromagnetic resonance, including three phase mains and the threephase potential transformer PT that model is JDZX16-10RG being connected on three buses of three phase mains, it is connected between the primary side neutral point of described voltage transformer pt with the earth and has nonlinear zero sequence resistance R or single-phase potential transformer PT1.Rated capacity 20VA of described voltage transformer pt, rated frequency 50Hz, rated current 2.8mA, specified phase voltage 5.77kV, resistance 14 Ω ＜ R≤50 Ω of described resistance R, when system generation single-phase earthing, more effective than harmonic elimination during 15 Ω when resistance R is 50 Ω.
As shown in Figure 2, another embodiment of the present utility model, a kind of electric power system model simulating suppression 10kV electrical network three-phase ferromagnetic resonance, including three phase mains and the threephase potential transformer PT that model is JDZX16-10RG being connected on three buses of three phase mains, it is connected between the primary side neutral point of described voltage transformer pt with the earth and has single-phase potential transformer PT1.Rated capacity 20VA of described voltage transformer pt, rated frequency 50Hz, rated current 2.8mA, specified phase voltage 5.77kV.If the zero sequence impedance of voltage transformer pt is Zm, during single-phase potential transformer PT1 shown in non-map interlinking 2, the zero sequence impedance of voltage transformer pt branch road is 1/3Zm, after accessing single-phase potential transformer PT1, the zero sequence impedance of whole system is become 4/3Zm from original 1/3Zm, compares original voltage transformer pt and increases 3 times.Under system is in identical shooting condition, such as Fig. 2, the dash current that voltage transformer pt branch road bears will be reduced to original 1/4, thus effectively suppresses resonance overvoltage overcurrent.
Finally illustrate is, above example is only in order to illustrate the technical solution of the utility model and unrestricted, although this utility model being described in detail with reference to preferred embodiment, it will be understood by those within the art that, the technical solution of the utility model can be modified or equivalent, without deviating from objective and the scope of the technical program, it all should be contained in the middle of right of the present utility model.
Claims (5)
1. the electric power system model simulating suppression 10kV electrical network three-phase ferromagnetic resonance, including three phase mains and the threephase potential transformer PT being connected on three buses of three phase mains, it is characterised in that: it is connected between the primary side neutral point of described voltage transformer pt with the earth and has zero sequence resistance R or single-phase potential transformer PT1.
A kind of electric power system model simulating suppression 10kV electrical network three-phase ferromagnetic resonance the most as claimed in claim 1, it is characterised in that: described resistance R is nonlinear resistance.
A kind of electric power system model simulating suppression 10kV electrical network three-phase ferromagnetic resonance the most as claimed in claim 1, it is characterised in that: resistance 14 Ω ＜ R≤50 Ω of described resistance R.
A kind of electric power system model simulating suppression 10kV electrical network three-phase ferromagnetic resonance the most as claimed in claim 1, it is characterised in that: the model of described voltage transformer pt is JDZX16-10RG.
A kind of electric power system model simulating suppression 10kV electrical network three-phase ferromagnetic resonance the most as claimed in claim 1, it is characterised in that: rated capacity 20VA of described voltage transformer pt, rated frequency 50Hz, rated current 2.8mA, specified phase voltage 5.77kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520945753.XU CN205429727U (en) | 2015-11-24 | 2015-11-24 | Simulation restraines 10kV electric wire netting three -phase ferroresonance's electric power system model |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520945753.XU CN205429727U (en) | 2015-11-24 | 2015-11-24 | Simulation restraines 10kV electric wire netting three -phase ferroresonance's electric power system model |
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| Publication Number | Publication Date |
|---|---|
| CN205429727U true CN205429727U (en) | 2016-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520945753.XU Active CN205429727U (en) | 2015-11-24 | 2015-11-24 | Simulation restraines 10kV electric wire netting three -phase ferroresonance's electric power system model |
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| Country | Link |
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| CN (1) | CN205429727U (en) |
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2015
- 2015-11-24 CN CN201520945753.XU patent/CN205429727U/en active Active
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