CN101354956A - Large-capacity double-body phase-shifting transformator - Google Patents

Abstract

The invention relates to a large-capacity dual-body phase-shift transformer which comprises a series transformer oil tank, an exciting transformer oil tank, a series transformer, an exciting transformer, and a resistance type on-load tap-changer with a polarity selector. Each phase of the series transformer consists of a high voltage coil and a low voltage coil; each phase of the exciting transformer consists of a high voltage coil and a phase-shift coil; and a tapping cap of the phase-shift coil of each phase of the exciting transformer is in contact with a static contact of the resistance type on-load tap-changer of the phase, and two ends of the phase-shift coil of the phase are connected with the positive and negative ends of the polarity selector of the phase. A mobile contact of the polarity selector is connected with one end of the low voltage coil of the corresponding phase of the series transformer. The transformer has the advantages that: the transformer solves the problem of over current caused by transmission lines connected in parallel, thereby bringing about stability and high efficiency for the run of an electric system.

Description

Large-capacity double-body phase-shifting transformator

Technical field

The present invention relates to a kind of large-capacity double-body phase-shifting transformator, be applicable to electric power system transmission line in parallel, its capacity is greater than 250MVA, phase shifting angle ± 60 °.Belong to the power transformer technical field.

Background technology

Large-scale electric power system requires to have very high reliability and high efficiency, usually all be to be formed in parallel by a plurality of electric power systems, the reliability of each electric power system and sharing of load are that the factor of main influence has line impedance, power factor by the decision of the different qualities parameter of this system.The application of phase shifting transformer in transmission line in parallel greatly improved the reliability of electric power system.The main application of phase shifting transformer in electric power system can conclude following some:

The transmission line of a, protection electric power system prevents that it from transshipping;

The stability of b, improvement electric power system;

C, the different electric power networks of flow of power control to(for) the overhead transmission line in parallel and the cable line of long distance;

D, can make original transmission system increase-volume.

By retrieval, up to the present, do not find the large-capacity double-body phase-shifting transformator identical as yet with structure of the present invention.

Summary of the invention

Technical problem to be solved by this invention provides and a kind ofly can solve be incorporated into the power networks overcurrent problem in the transmission line of electric power system, guarantees that electric power system is incorporated into the power networks efficiently, the large-capacity double-body phase-shifting transformator of stable operation.

The present invention adopts following technical scheme:

The present invention includes series transformer fuel tank, excitation transformer fuel tank, series transformer, excitation transformer, had polarity selector K _ZF1Resistance-type on load tap changer K;

The series transformer fuel tank is connected with the excitation transformer fuel tank by pipeline;

Series transformer is every by high-tension coil L _CgWith low-voltage coil L _CdForm the low-voltage coil L of series transformer _CdBe delta connection, each phase high-tension coil L of series transformer _CgPower end be respectively S1, S2, S3, each phase high-tension coil L of series transformer _CgCorresponding load end is surveyed and is respectively L1, L2, L3;

Excitation transformer is every by high-tension coil L _LgWith phase shift coil L _LtForm the high-tension coil L of excitation transformer _LgBe Y-connection, the every phase high-tension coil of excitation transformer L _LgThe other end meet the high-tension coil L of the corresponding phase of series transformer respectively _CgCentre cap; The every phase shift phase coil of excitation transformer L _LtThe contact of deciding of tap leading-out end and this resistance-type on load tap changer mutually connect this phase shift phase coil L _LtThis phase polarity selector of two terminations K _ZF1Positive and negative two ends, described polarity selector K _ZF1Moving contact and the corresponding low-voltage coil L mutually of series transformer _CdAn end be connected.

Good effect of the present invention is that the phase angle by this phase shifting transformer is regulated the electric current that can control each parallel branch of electric power system in parallel, thereby solves because the overcurrent problem that transmission line in parallel causes, makes the stable and efficient of electric power system.

Description of drawings

Fig. 1 is structural representation of the present invention (winding diagram).

Fig. 2 is a single-phase winding diagram of the present invention.

Fig. 3 is a vectogram.

Embodiment

By the embodiment shown in Fig. 1-3 as can be known, it includes series transformer fuel tank, excitation transformer fuel tank, series transformer, excitation transformer, has polarity selector K _ZF1Resistance-type on load tap changer K;

The series transformer fuel tank is connected with the excitation transformer fuel tank by pipeline;

Series transformer is every by high-tension coil L _CgWith low-voltage coil L _CdForm the low-voltage coil L of series transformer _CdBe delta connection, each phase high-tension coil L of series transformer _CgPower end be respectively S1, S2, S3, each phase high-tension coil L of series transformer _CgCorresponding load end is surveyed and is respectively L1, L2, L3;

Excitation transformer is every by high-tension coil L _LgWith phase shift coil L _LtForm the high-tension coil L of excitation transformer _LgBe Y-connection, the every phase high-tension coil of excitation transformer L _LgThe other end meet the high-tension coil L of the corresponding phase of series transformer respectively _CgCentre cap; The every phase shift phase coil of excitation transformer L _LtThe contact of deciding of tap leading-out end and this resistance-type on load tap changer mutually connect this phase shift phase coil L _LtThis phase polarity selector of two terminations K _ZF1Positive and negative two ends, described polarity selector K _ZF1Moving contact and the corresponding low-voltage coil L mutually of series transformer _CdAn end be connected.

In Fig. 1, SOLO, N are respectively different earth terminals.

The operation principle of present embodiment is as follows:

Resistance-type on load tap changer K is used for adjusting the output voltage (add deduct, the supporting operating mechanism of utilization and resistance-type on load tap changer K is regulated automatically) of excitation transformer.This voltage provides excitation for the iron core of series transformer, the every phase high-tension coil of series transformer L _CgFirst head be connected on the incoming line, its end head is connected on the outlet line, and load current flows through this coil, the wiring of series transformer and excitation transformer as shown in Figure 1.Under the situation of this wiring, the low-voltage coil L that connects with triangle on the series transformer _CdOn voltage variety leading or lag behind the corresponding high-tension coil L of excitation transformer _LgOn 90 ° of voltages.This voltage is sent to corresponding high-tension coil L on the series transformer _CgOn, and produce voltage With

(see figure 3), these two voltages make the mains side voltage of this phase shifting transformer

And load side voltage

Between produce a phase angle variation, and the output voltage size is identical with the input voltage size, the basic function (variation of phase angle) of Here it is this phase shifting transformer.The voltage of large-capacity double-body phase-shifting transformator mains side of the present invention and load-side equates, but the phase angle difference of these both sides is continuously adjustable in certain limit, phase angle by phase shifting transformer is regulated the electric current that can control each parallel branch of electric power system in parallel, thereby solve because the overcurrent problem that transmission circuit in parallel causes, make the stable and efficient of electric power system.

Claims (1)

1, large-capacity double-body phase-shifting transformator is characterized in that it includes series transformer fuel tank, excitation transformer fuel tank, series transformer, excitation transformer, has polarity selector K _ZF1Resistance-type on load tap changer K;

The series transformer fuel tank is connected with the excitation transformer fuel tank by pipeline;

Series transformer is every by high-tension coil L _CgWith low-voltage coil L _CdForm the low-voltage coil L of series transformer _CdBe delta connection, each phase high-tension coil L of series transformer _CgPower end be respectively S1, S2, S3, each phase high-tension coil L of series transformer _CgIt is L1, L2, L3 in addition that corresponding load end is surveyed branch;

Excitation transformer is every by high-tension coil L _LgWith phase shift coil L _LtForm the high-tension coil L of excitation transformer _LgBe Y-connection, the every phase high-tension coil of excitation transformer L _LgThe other end meet the high-tension coil L of the corresponding phase of series transformer respectively _CgCentre cap; The every phase shift phase coil of excitation transformer L _LtThe contact of deciding of tap leading-out end and this resistance-type on load tap changer mutually connect this phase shift phase coil L _LtThis phase polarity selector of two terminations K _ZF1Positive and negative two ends, described polarity selector K _ZF1Moving contact and the corresponding low-voltage coil L mutually of series transformer _CdAn end be connected.

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