CN2658918Y - Frequency-selecting type reactor - Google Patents

Abstract

Belonging to the technical field of electrician, the utility model provides a passive reactor that does not require additional power source. The inductance of such reactor to fundamental frequency is minimal while to other harmonic frequencies is great. The reactor, consisting of a transformer, an inducer, a condenser and a resistor, is mainly applied to instrument for controlling harmonic frequency pollution.

Description

The frequency-selecting type reactor

The utility model belongs to electrical technology field.

In electrical field, the inductance value L value of general reactor is fixed, its reactance value equals 2 Л fL, in the harmonic wave control engineering, need a kind of damping reactor, require this reactor, for fundamental frequency, inductance value L is very little, and is bigger to three times, five times, the inductance value of seven inferior harmonic waves, to reach the purpose of the Harmonic Interference power supply grid that prevents that the user from producing; Use the electronics technology, can make this reactor, owing to need other additional supply, in the power electronics field, be referred to as to call active filter, use the very easy realization in the harmonic treating apparatus of 0.4KV of this active filter, but difficulty is bigger in high voltage power network, and cost is very high, maintenance load is big, is difficult for promoting the use of; The making of this reactor becomes the critical component in the harmonic wave control engineering.

The purpose of this utility model is: a kind of passive reactance device that does not need additional supply is provided, this reactor is for fundamental frequency, inductance value L is very little, and inductance value is very big for three times, five times, seven inferior other harmonic frequencies, and service condition and line voltage grade are irrelevant.

The purpose of this utility model is achieved in that with silicon steel sheet is transformer T of iron core winding _P, the number of turn of primary coil AB is W ₁, 2 of AB are the terminals of this reactor, the number of turn of secondary coil ab is W ₂, tandem electric inductance device L in the secondary coil loop ₁, capacitor C ₁And resistor R ₁, choose L ₁And C ₁Value, make L ₁C ₁=(2 Л f ₁) ^-2, f wherein ₁Be fundamental frequency, the electric current I by fundamental frequency in primary coil AB ₁, selected R ₁Value, make secondary coil ab current in loop I ₂=I ₁W ₁/ W ₂

Owing to adopt such scheme, make reactor provided by the utility model, inductance value to fundamental frequency is very little, and is very big to the inductance value greater than the various high order harmonic components of first-harmonic, because the utility model is only formed with transformer, inductor, capacitor and resistor, therefore failure rate is few, cost is low, and is durable in use, because without other accessory power supplys, this reactor can be applied in the occasion of various electric pressures, and the treatment cost of high-voltage fence harmonic pollution is reduced greatly.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 provides the electrical schematic diagram of the utility model structure, wherein: T _PBe transformer, L ₁Be inductor, C ₁Be capacitor, R ₁Be resistor, T _PThe primary coil AB number of turn be W ₁, 2 of AB are the terminals of this reactor, the number of turn of secondary coil ab is W ₂, theory analysis and actual measurement all are easy to proof, under the situation that satisfies following two conditions, and the inductance value L that AB is 2 ₀For fundamental frequency f ₁L ₀≈ 0, and for for the each harmonic the first-harmonic, L ₀Be very big value, its condition is 1. L ₁C ₁=(2 Л f ₁) ^-2, the 2. electric current I by fundamental frequency in primary coil AB ₁The time, the electric current I in secondary coil ab network ₂=I ₁W ₁/ W ₂

Fig. 2 provides the electrical schematic diagram of the harmonic shutter of using the utility model composition, wherein V ₁Be line voltage, M represents to produce the electrical appliance of harmonic pollution, L ₂And C ₂Be the triple-frequency harmonics leakage path, L ₂C ₂=(2 Л f ₃) ^-2, frequency f wherein ₃=3f ₁, f ₁Equal fundamental frequency, L ₃And C ₃Be the quintuple harmonics leakage path, L ₃C ₃=(2 Л f ₅) ^-2, f wherein ₅=5f ₁, use harmonic shutter shown in Figure 2, the actual measurement of supply current I1 is shown triple-frequency harmonics 25% drops to 1% by what do not administer, quintuple harmonics 20% drops to 1% by what do not administer, and the seventh harmonic 8% drops to 0.1% by what do not administer.

Claims (1)

1. A kind of frequency-selecting type reactor is made up of transformer, inductor, capacitor and resistor, it is characterized in that: be transformer T of iron core winding with silicon steel sheet _P, the number of turn of primary coil AB is W ₁, 2 of AB are the terminals of this reactor, the number of turn of secondary coil ab is W ₂, tandem electric inductance device L in the secondary coil loop ₁, capacitor C ₁And resistor R ₁, choose L ₁And C ₁Value, make L ₁C ₁=(2 Л f ₁) ^-2, f wherein ₁Be fundamental frequency, the electric current I by fundamental frequency in primary coil AB ₁, selected R ₁Value, make secondary coil ab current in loop I ₂=I ₁W ₁/ W ₂

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