CN105633939A

CN105633939A - Three-phase five-column arc suppression coil

Info

Publication number: CN105633939A
Application number: CN201410586136.5A
Authority: CN
Inventors: 李�杰; 徐锡舟; 洪振兴
Original assignee: JIANGSU HONGAN TRANSFORMER CO Ltd
Current assignee: JIANGSU HONGAN TRANSFORMER CO Ltd
Priority date: 2014-10-29
Filing date: 2014-10-29
Publication date: 2016-06-01

Abstract

The present invention discloses a three-phase five-column arc suppression coil, belonging to the field of the transformer design and manufacture technology. The function integration of grounding and arc suppression is realized. An iron core employs amorphous alloy with an air gap for the first time, and the end face of the air gap is smooth and high in precision, so that the noise caused by an adjustable air gap is effectively reduced; three-column main winding at the middle of the iron core is in star connection, a neutral point is directly earthed, air gaps are arranged at the columns at two sides, and the columns at two sides and the middle column are configured to form zero-sequence magnetic continuity; the columns at two sides are wound by coils and are provided with inductive loads with three different amounts of reactance, and the coarse adjustment and fine adjustment of compensation current are realized. The three-phase five-column arc suppression coil is able to overcome defects of too heat system, large active loss, enlarged compensation current waveform distortion and large residual after compensation which are caused by long-time direct current excitation through fully employing the advantages of high magnetic conduction and low energy consumption of an amorphous alloy. The accomplishment of the three-phase five-column arc suppression coil is mainly used in a high-voltage electric power system.

Description

A kind of three-phase five-column arc-suppression coil

Technical field

The present invention relates to a kind of three-phase five-column arc-suppression coil, belong to design of transformer manufacturing technology field.

Background technology

During conductor energising, it will usually producing magnetic field in its occupied certain space scope, the most popular says, can play the thing of the effect of impedance in circuit, just be its reactor. But the inductance of the long straight conductor that is energized is less, produced magnetic field is not strong, and therefore actual reactor is that wire is coiled into solenoid form, claims air reactor; Sometimes for allowing this solenoid have bigger inductance, in solenoid, just insert iron core, claim iron-core reactor.

Owing to have employed reactor, when being short-circuited, the voltage drop on reactor is relatively big, so having also functioned to maintain the effect of busbar voltage level, makes the voltage pulsation on bus less, it is ensured that the stability of the user's electric equipment operation on non-fault line. Reactor, as reactive-load compensation means, is indispensable in power system. Damping reactor (generally also referred to as current-limiting reactor) is in series with Capacitor banks or closely packed capacitor, in order to the inrush phenomenon of limiting capacitance device.

Generally, arc is a kind of single-phase reactor being connected between the neutral point of isolated neutral system and ground, for compensating direct-to-ground capacitance power current during singlephase earth fault. During isolated neutral system generation single-phase earthing, it is line voltage that healthy phases voltage raises, and flows through the electric current of trouble point equal to 3 times of every phase capacitance currents. The electric current of trouble point is relatively big, and the electric arc of generation not easily extinguishes, and expands as phase fault sometimes. For this, system neutral of being everlasting installs arc additional, compensates capacitance current with inductive current, makes fault electric arc extinguish rapidly. The profile of arc is similar with single-phase transformer. Internal it is actually by segment core with band gap around being constituted with coil. Owing to iron core is with gap, so induction reactance value is more stable, bigger inductive current can be obtained. Reactor is provided with some taps, in order in certain scope, and classification regulates the size of inductance.

When single-phase arc is used in three-phase electrical power system, often can only increase this arc device mutually respectively, in use there is certain defect in this, and device is complicated too much, it is also possible to bring the imbalance problem of three-phase extinguishing arc.

Summary of the invention

For drawbacks described above and deficiency, present invention introduces a kind of three-phase five-column arc-suppression coil, it is achieved ground connection and extinguishing arc two body integrating system. The main contents related to are as follows:

(1) iron core adopts the non-crystaline amorphous metal with air gap first;

(2) middle three post main winding Y-connections unshakable in one's determination, neutral-point solid ground, form a similar grounding transformer;

(3) two side columns have air gap, and two side columns and intermediolateral column form zero sequence fluxes road, and two side columns are wound with coil, and with the different inductive load of three reactance amounts;

(4) reactor L1 and L2 is respectively through two catalyst break-makes, and to realize compensating the coarse adjustment of electric current, reactor L3 is by two antiparallel controllable silicon break-makes, and regulates the size of this inductive branch electric current, to realize the fine tuning of compensation electric current;

(5) it is applicable to entirely compensate system from motion tracking by electric network capacitance and current.

The invention has the beneficial effects as follows: (1), employing non-crystaline amorphous metal, the smooth precision of air gap end face is high, effectively reduces the noise owing to adjustable air gap produces; (2), the adjustable linearity of inductance is accurate; (3), make full use of non-crystaline amorphous metal height magnetic conduction low energy consumption advantage, overcome due to time long DC excitation and remain big shortcoming after causing system easily overheated, active loss big and compensate that current waveform distortion is big, compensating; (4), ground connection and extinguishing arc two body integrating system, reduce cost. It is applicable to entirely compensate system from motion tracking by electric network capacitance and current.

Accompanying drawing explanation

Accompanying drawing 1 is the structure chart of three-phase five-column arc extinction electric reactor.

In figure, A, B, C are three-phase terminal, and L1 is reactor 1, L2 be reactor 2, L3 is reactor 3, I_LFor neutral ground electric current.

Detailed description of the invention

In conjunction with the accompanying drawings and embodiments, it is described as follows:

Described invention is in three-phase electrical power system, including five core limbs. Iron core adopts the non-crystaline amorphous metal with air gap first, and the smooth precision of air gap end face is high, it is possible to effectively reduce the noise owing to adjustable air gap produces; Three posts in the middle of iron core, main winding Y-connection, neutral-point solid ground, form a similar grounding transformer; Two side columns all have air gap, and two side columns form zero sequence fluxes road with intermediolateral column; Two side columns are wound with coil, and with the different inductive load of three reactance amounts; Reactor L1 and L2 is respectively through two catalyst break-makes, and to realize compensating the coarse adjustment of electric current, reactor L3 is by two antiparallel controllable silicon break-makes, and regulates the size of this inductive branch electric current, to realize the fine tuning of compensation electric current;

The described adjustable linearity of invention inductance is accurate, makes full use of non-crystaline amorphous metal height magnetic conduction low energy consumption advantage, overcome due to time long DC excitation and cause system easily overheated, active loss big and compensate that current waveform distortion is big, compensate after remain big shortcoming. System earth and the unification of extinguishing arc two body, make cost be substantially reduced.

Claims

1. a three-phase five-column arc-suppression coil, it is characterised in that: adopt the amorphous alloy core with air gap, apparatus structure design Three phase five post.

2. according to claim 1, it is characterised in that: three post main winding Y-connections in the middle of unshakable in one's determination, neutral-point solid ground, form a similar grounding transformer.

3. according to claim 1, it is characterised in that: two side columns have air gap, and two side columns and intermediolateral column form zero sequence fluxes road, and two side columns are wound with coil, and with the different inductive load of three reactance amounts.

4. according to claim 1, it is characterized in that: reactor L1 and L2 is respectively through two catalyst break-makes, and to realize compensating the coarse adjustment of electric current, reactor L3 is by two antiparallel controllable silicon break-makes, and regulate the size of this inductive branch electric current, to realize compensating the fine tuning of electric current.

5. according to claim 1, it is characterised in that: ground connection and the unification of extinguishing arc two body.