CN202535069U - Series-connected ferroresonance return circuit - Google Patents
Series-connected ferroresonance return circuit Download PDFInfo
- Publication number
- CN202535069U CN202535069U CN2012201274467U CN201220127446U CN202535069U CN 202535069 U CN202535069 U CN 202535069U CN 2012201274467 U CN2012201274467 U CN 2012201274467U CN 201220127446 U CN201220127446 U CN 201220127446U CN 202535069 U CN202535069 U CN 202535069U
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- series
- return circuit
- utility
- model
- loop
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Abstract
The utility model discloses a series-connected ferromagnetic resonance return circuit which comprises an alternating current power supply, a resistor, a capacitor and a nonlinear inductance, wherein the alternating current power supply, the resistor, the nonlinear inductance and the capacitor are connected in series to form the return circuit. The series-connected ferromagnetic resonance return circuit is extremely simple in structure, low in achievement cost, and quite meaningful for the research of ferroresonance overvoltage in an electrical power system.
Description
Technical field
The utility model relates to a kind of ferromagnetic series resonance loop.
Background technology
Have many iron inductance elements in the electric power system, like generator, transformer, voltage transformer etc.These element major parts are non-linear element, they with system in the distributed capacitance that exists or the element oscillation circuit of forming many complicacies, if meet some requirements, just possibly excite long-term ferro-resonance over-voltage.The form of expression of ferro-resonance over-voltage possibly be that single-phase, two-phase or three phase-to-ground voltages raise, or with frequency wobbles, causes insulation flashover or Explosion of on Arrester; Or produce high value zero sequence voltage component, produce the indication of illusory grounding phenomenon and incorrect ground connection; Overcurrent perhaps in instrument transformer, occurs, cause that fuse or instrument transformer burn; Perhaps make low capacity asynchronous motor generation reversal development.Therefore, research ferro resonance loop is significant to electric power system.But the existing ferro resonance loop that is used to study is all very complicated, has greatly increased research cost when making troubles to research.
Summary of the invention
The purpose of the utility model is to overcome the defective of prior art and a kind of ferromagnetic series resonance loop is provided, and its structure is extremely simple, realize with low cost, for the research of ferro-resonance over-voltage in the electric power system highly significant.
The technical scheme that realizes above-mentioned purpose is:
A kind of ferromagnetic series resonance loop comprises AC power, resistance, electric capacity and nonlinear inductance, and said AC power, resistance, nonlinear inductance and electric capacity are connected successively and constituted the loop.
The beneficial effect of the utility model is:
The structure of the utility model is extremely simple, realizes with low costly, has made things convenient for research, for the research of ferro-resonance over-voltage in the electric power system highly significant.
Description of drawings
Fig. 1 is the ferromagnetic series resonance loop circuit figure of the utility model.
Embodiment
To combine accompanying drawing that the utility model is described further below.
See also Fig. 1, the ferromagnetic series resonance loop of the utility model comprises AC power U, resistance R, capacitor C and nonlinear inductance L, and nonlinear inductance L promptly has inductance unshakable in one's determination,
AC power U, resistance R, nonlinear inductance L and capacitor C are connected successively and are constituted the loop.
The loop differential equation of the utility model is:
The utility model is with low cost, can be easy to realize, is very easy to research.Simultaneously, we can do many-sided research based on formula (1), for example:
The voltage-current characteristic of supposing nonlinear inductance L can replace excitation curve; The resistance of resistance R is zero.
So formula (1) just can be simplified to as follows:
E＝U
L+U
C (2)
E is the voltage of AC power U in the formula (2); U
LVoltage for nonlinear inductance L; U
CVoltage for capacitor C.
If U
L＞U
C, then current in loop is perception; Otherwise be capacitive.If get inductance current for just, capacitance current is for negative.Current in loop does
I＝E/j(X
L-X
C) (3)
In the formula (3), X
LAnd X
CBe respectively induction reactance and capacitive reactance in the loop; J is a coefficient, is fixed value;
U
LVoltage for nonlinear inductance L then has
U
L＝jX
LI (4)
U
C＝I/jX
C (5)
Formula (4) and formula (5) be corresponding induction reactance line of difference and capacitive reactance line on the voltage-current characteristic plane.
Above embodiment only supplies to explain the usefulness of the utility model; But not to the restriction of the utility model; The technical staff in relevant technologies field under the situation of the scope that does not break away from the utility model, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to the category of the utility model, should be limited each claim.
Claims (1)
1. a ferromagnetic series resonance loop comprises AC power, resistance and electric capacity, it is characterized in that, said ferromagnetic series resonance loop also comprises nonlinear inductance, and said AC power, resistance, nonlinear inductance and electric capacity are connected successively and constituted the loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201274467U CN202535069U (en) | 2012-03-30 | 2012-03-30 | Series-connected ferroresonance return circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201274467U CN202535069U (en) | 2012-03-30 | 2012-03-30 | Series-connected ferroresonance return circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202535069U true CN202535069U (en) | 2012-11-14 |
Family
ID=47136226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201274467U Expired - Fee Related CN202535069U (en) | 2012-03-30 | 2012-03-30 | Series-connected ferroresonance return circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202535069U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445109A (en) * | 2018-05-04 | 2019-11-12 | 南京南瑞继保电气有限公司 | A kind of quick removing method and device of Ferroresonance Overvoltage Caused by PT |
-
2012
- 2012-03-30 CN CN2012201274467U patent/CN202535069U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445109A (en) * | 2018-05-04 | 2019-11-12 | 南京南瑞继保电气有限公司 | A kind of quick removing method and device of Ferroresonance Overvoltage Caused by PT |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20200330 |