CN2894026Y - Three-phase stable voltage regulating apparatus compensating coil inductive voltage lowering and contact arc extinguishing structure - Google Patents

Abstract

The utility model discloses the structure of the compensation coils for lowering the induced voltage and the contact arc-suppression devices of a three-phase apparatus for voltage stabilization and control. The utility model comprises a plurality of primary cascading windings coils from each phase of a compensation transformer, and the control contacts which are utilized by a control circuit to regulate the coil taps. The apparatus is also characterized in the following components. The control contacts for connection and voltage lowering are positioned between two coils in the middle of a plurality of primary cascading compensation coils, which are divided into two parts. An arc-suppression coil is respectively cascaded to each end of the primary cascading compensation coils regulated by the control contacts to reduce the voltage of the primary cascading compensation coils below 660V. With the reverse electromotive force produced by the inductive reactance of the arc-suppression coils connected to the ends of the primary cascading compensation coils, the contact arc-suppression coils prevent the sudden changes of the electric currents flowing along the coils, therefore functioning to suppress the arc, enabling the voltage stabilization and the control apparatus to perform with reliability and guaranteeing the practical use of the apparatus.

Description

The structure of three-phase voltage regulator device compensating coil drop induction voltage and contact arc-suppression

Technical field

The utility model relates to a kind of circuit arrangement of compensating power, especially the voltage stabilization and regulation device compensating coil drop induction voltage of the phase voltage of three-phase circuit, line voltage and the structure of contact arc-suppression.

Background technology

The voltage fluctuation of existing power network differs at peak period and low peak period and often surpasses national regulation, even surpasses ± 10%, and particularly the terminal voltage of low pressure 380V is especially obviously unstable.Present pressure regulation, stable-pressure device are mainly the servo-type voltage regulating mode, and servo electric machine type is owing to be to utilize carbon brush to carry out pressure regulation, when carbon brush thread-changing groove, produce the arcing phenomenon and burn out coil, failure rate height easily, incompatibility is comparatively being used in the rugged environment, will reduce the runnability and the useful life of power consumption equipment like this, even make some to the relatively stricter equipment cisco unity malfunction of voltage request, simultaneously energy consumption is increased greatly, and existing voltage-regulation voltage-stabilization technology and product exist complex structure, reasons such as poor reliability and cost height.Therefore, hindered the voltage-regulation voltage-stabilization broad application.

For this reason, our company provides a kind of adaptability strong on August 27th, 2004, energy consumption is low, simple in structure, " three-phase voltage regulator device and the control method " that good reliability and cost are low, and applied for that patent of invention, application number are 200410060781.x, on March 18th, 2005 announced and entered examination as to substance.

This invention comprises sampling controller, control circuit and the three-phase compensator transformer that contains microcomputer, it is characterized in that:

The every phase secondary winding of described three-phase compensator transformer is only established a winding coil, and each secondary winding coil input end is connected with corresponding three phase mains respectively, and each output is connected with corresponding load; Each mutually elementary winding is established more than one some winding coils and tap thereof, and each tap is connected by corresponding phase line, the zero line of control circuit with the input power supply;

Comprise several contactors in the described control circuit, the control coil of each contactor is subjected to the control of described sampling controller, by corresponding contact, control the corresponding phase line of the corresponding tap of each phase primary winding coil of described three-phase compensator transformer with the power supply of input, zero line is connected or elementary winding between short circuit.

The control method of this invention three-phase voltage regulator device is:

(1) sampling controller connects the output collection voltage signal of load automatically from compensator transformer, the microcomputer system analysis and judgement in this signal via controller, if the voltage of output has super scope fluctuation, then sampling controller sends corresponding instruction and gives control circuit;

(2) the sampling controller instruction of sending comprises and makes in the control circuit corresponding contactor by the contact, the corresponding coil of connecting the elementary winding of compensator transformer with import being connected of corresponding line voltage of three phase mains and/phase voltage;

(3) instruction of corresponding contactor execution sampling controller in the control circuit, by corresponding contact, make each corresponding coil utilization input three phase mains of the elementary winding of compensator transformer line voltage and/phase voltage, by little to greatly with the compensation that superposes in an orderly manner of different from large to small voltage forward or backwards, this compensatory reaction makes output voltage approach the voltage regulation of voltage regulation central value of setting on the secondary winding that is serially connected with the compensator transformer between power supply and the load.

Described line voltage and phase voltage be for A mutually for the compensation circuit, can be the phase voltage between line voltage and the A-N between the A-B of three phase mains A, B, C and zero line N or the A-C; For B phase compensation circuit, can be the phase voltage between line voltage and the B-N between the B-C of three phase mains A, B, C and N or the B-A; For C phase compensation circuit, can be the C-A of three phase mains A, B, C and N or line voltage between the C-B and the phase voltage between the C-N.

The three-phase voltage regulator device and the control method thereof of said structure, sampling controller samples voltage signal from output automatically, enter microcomputer system through filtering, analysis and judgement computer several relevant contactors of sending instruction control circuit produce action according to instruction as calculated, and to connect elementary corresponding each the winding coil lead-out wire of three-phase compensator transformer be tap and the phase line of importing three phase mains or being connected of lead-out wire end to end by the control of corresponding contact.Compensator transformer enters voltage stack compensation forward or backwards when the voltage fluctuation of exporting is big, this compensatory reaction is created on the compensator transformer secondary winding that is serially connected with between power supply and the load, makes output voltage approach the voltage-regulation voltage-stabilization central value of program setting.Wherein, phase voltage and line voltage that why the every mutually elementary winding loop power supply of compensator transformer alternately is taken from the input three phase network respectively are because under same power capacity, the operating voltage that improves the loop can reduce operating current effectively, and the rated operational voltage of general A.C. contactor is 380/660 volt, can reduce the impact of electric current effectively like this to contactor or relay, reduce failure rate, reduce cost, every grade compensated regulation voltage amplitude is even, the operation curve of control output voltage stably, voltage fluctuation is strict controlled in ± 3% or ± 2% within.This is that prior art can't be accomplished, and, it is wide to have the voltage-regulation scope, precision of voltage regulation height, good output waveform, cost is low, device lifetime is long, high reliability features satisfies the needs that indoor outer pressure regulation and voltage stabilizing are powered, and is applicable to load that needs voltage stabilizing and the load that different voltage-regulation voltage-stabilization central values need be provided according to the different periods in running.

Above-described three-phase voltage regulator device, in actual applications, we find, in the elementary compensation winding coil of a plurality of serial connections, because the effect of induction, it is very high that inductive rise on the coil of tail end is got, and is higher than 660 volts, surpassed in this device between contactor and coil and the insulation safety voltage of components and parts, the insulation safety voltage of general industry and civil electric appliance spare is 660 volts.And, switch in each corresponding winding coil in this device compensation, exist between the contact of contactor because of arcing produces the phenomenon of alternate or phase line and zero line short circuit, have influence on the operate as normal of three-phase voltage regulator device, reliably and practicality.Through practice and research, we have found the way that addresses this problem.

Summary of the invention

The purpose of this utility model provides a kind of structure of three-phase voltage regulator device compensating coil drop induction voltage.

Another purpose of the present utility model provides a kind of structure of three-phase voltage regulator device bucking coil contact arc-suppression.

The utility model comprises the control contact of the elementary compensation winding coil of the every mutually a plurality of serial connections of compensator transformer, control circuit and each described coil tap of control thereof,

The structure of compensating coil drop induction voltage is:

Between two coils in the middle of the elementary bucking coil of described a plurality of serial connections, be provided with step-down contact contact, a plurality of serial connection bucking coils are divided into two sections of front and back, when back segment/leading portion then of no use, by step-down contact contact, disconnect back segment/leading portion coil, reduce induced voltage.

The structure of bucking coil contact arc-suppression is:

At the two ends of the elementary bucking coil of described a plurality of serial connections, be connected in series an arc suppression coil respectively again, the two ends of this two arc suppression coil are the control of controlled contact also.

In the middle of each mutually elementary bucking coil of compensator transformer of three-phase voltage regulator device, be provided with step-down contact contact, in the centre the elementary bucking coil of a plurality of serial connections is divided into two sections, thereby reduced the induced voltage problem of a plurality of serial connection coils, induced voltage is reduced below 660V, satisfy the safe insulation voltage of each components and parts in the circuit, reduced cost, increased the reliability of voltage regulator device.Respectively increase the control contact arc-suppression coil that connects at each mutually elementary bucking coil two ends, when the control closing of contact of this arc suppression coil/disconnection, also closure/the disconnection of control contact of other coil, because the induction reactance of arc suppression coil produces inverse electromotive force, the electric current of flowing through coil can not be suddenlyd change, thereby reach the effect of extinguishing arc.The voltage regulator device can be moved reliably, have practical value.

Description of drawings

Fig. 1 is a phase compensating circuit and a part control circuit schematic diagram in the utility model.

Fig. 2 is the vectogram of elementary bucking coil induced voltage among Fig. 1.

Embodiment

Below, in conjunction with the accompanying drawings the utility model is elaborated.

The present invention is an application " three-phase voltage regulator device and control method " in our company, and application number is to carry out on the basis of 20410060781.x.Clear in order to express, structure and the compensation method with the A circuitry phase in the three-phase circuit illustrates operation principle of the present invention below, and the circuit structure of all the other phases is identical.

Shown in Figure 1, be the compensating circuit schematic diagram of the utility model A phase, the structural principle of all the other two-phases is identical, analogizes.Clean and tidy for drawing in Fig. 1, omitted the protectiveness contact KD of original application.The A phase secondary winding of three-phase compensator transformer T is established a coil Q, an end and input power supply U _AConnect other end U _{Go out}Connect load, the number of turn of secondary winding coil Q is n.Elementary winding is established six coil Q1, Q2, Q3, Q4, Q5, Q6, and wherein coil Q1, Q2, Q3 are first's winding, and coil Q4, Q5, Q6 are the second portion winding, and the coil Q1 at two ends and Q6 are control contact arc-suppression coil.The number of turn of these six coils is respectively N1, N2, N3, N4, N5, N6, it is that elementary winding has 8 of taps that each coil is drawn the end of a thread, and these 8 taps are connected with A/B/C phase line or zero line in importing three phase mains by each corresponding contact device normally opened contact 1K～8K in the control circuit respectively.

In Fig. 1,, can release the operation principle of this compensating circuit according to the basic principle " primary and secondary winding voltage ratio equals primary and secondary umber of turn ratio " of transformer.If the input voltage of the A phase secondary winding of compensator transformer T is U _A, the number of turn of this secondary winding coil Q is n, the bucking voltage that produces at secondary winding Q is Δ U, output voltage U _{Go out}, as output U _{Go out}When departing from set point, control by sampling controller and control circuit.

Work as output voltage U _{Go out}When being higher than set point, have:

When compensating first grade of negative voltage, contact 1K, 5K, 7K closure are compensated voltage at compensator transformer secondary winding Q and are:

$\mathrm{\Δ}\stackrel{.}{U}=-\frac{{\stackrel{.}{U}}_{\mathrm{AN}}}{\frac{N_1+N_2+N_3+N_4+N_5}{n}}=-\frac{n{\stackrel{.}{U}}_{\mathrm{AN}}}{N_1+N_2+N_3+N_4+N_5}$

Wherein It is the phase voltage between phase line A and the zero line N.

In like manner, when compensating second grade of negative voltage, contact 1K, 5K, 6K closure, the bucking voltage that obtains at the secondary winding Q of compensator transformer is:

$\mathrm{\Δ}\stackrel{.}{U}=-\frac{{\stackrel{.}{U}}_{\mathrm{AB}}}{\frac{N_1+N_2+N_3+N_4}{n}}=-\frac{n{\stackrel{.}{U}}_{\mathrm{AB}}}{N_1+N_2+N_3+N_4}$

Wherein

Be the line voltage of AB phase, it is than leading 30 degree in the phase angle of the phase voltage of A phase.

During compensation third gear negative voltage, contact 1K, 4K closure have:

$\mathrm{\Δ}\stackrel{.}{U}=-\frac{{\stackrel{.}{U}}_{\mathrm{AB}}}{\frac{N_1+N_2+N_3}{n}}=-\frac{n{\stackrel{.}{U}}_{\mathrm{AB}}}{N_1+N_2+N_3}$

During compensation fourth speed negative voltage, contact 1K, 3K closure have:

$\mathrm{\Δ}\stackrel{.}{U}=-\frac{{\stackrel{.}{U}}_{\mathrm{AB}}}{\frac{N_1+N_2}{n}}=-\frac{n{\stackrel{.}{U}}_{\mathrm{AB}}}{N_1+N_2}$

Wherein

Be the line voltage of AB phase, it is than leading 30 degree in the phase angle of the phase voltage of A phase.If voltage be A-C line voltage than A lag behind mutually 30 the degree.

When compensating 0 grade of voltage, contact 1K, the 5K of control circuit contactor, 8K closure also are primary winding coil Q1, Q2, Q3, Q4, Q5, the Q6 short circuit Δ U=0V with compensator transformer T.The A phase output voltage of this compensating circuit , certainly, the A-B line voltage that adopts in above-mentioned analysis also can adopt A-C line voltage.

When needs compensation positive voltage, the computational methods of principle and bucking voltage are same as described above, the order difference of each closing of contact.

Work as output voltage U _{Go out}When being lower than set point, have:

When compensating first grade of positive voltage: contact 2K, 5K, 8K closure;

When compensating second grade of positive voltage: contact 3K, 5K, 8K closure;

Detailed voltage equation is analogized.

In Fig. 1, owing to increased arc extinguishing winding coil Q1 and Q6, avoided in each coil handoff procedure, because of causing the short circuit phenomenon between alternate or phase line and the zero line, the electric arcing that on/off produced of controlling the contact occurs.Between coil Q1～Q3 and two part windings of Q4～Q6, be provided with simultaneously contact control contact 5K, effectively avoided when only on a part winding, applying bucking voltage, owing to whole winding coils serial connections causes that the phenomenon of induction overvoltage occurs, the sense of control voltage between phases of answering is below 660V so effectively.

Below press the operation principle of contact contact 5K with regard to the publicly price-reduction of Fig. 1 circuit:

When compensation fourth speed negative voltage, contact 1K, 3K closure, the voltage that is applied on the coil Ql+Q2 is U _ABLine voltage, 400V for example supposes step-down contact contact 5K closure this moment, or does not establish step-down contact contact 5K that promptly coil Q1～Q6 all connects, so the tail end of coil Q6 be contact 8K on the A phase induced voltage of termination point be

$U_{\mathrm{AA}}=\frac{U_{\mathrm{AB}}}{N_1+N_2}\×\left(N_{1+}{N}_{2+}{N}_{3+}{N}_{4+}{N}_{5+}{N}_6\right)$

When getting the transformer secondary output umber of turn and be N=1 unit, elementary each coil turn is got N ₁=3, N ₂=8.75, N ₃=3.5, N ₄=7, N ₅=7, N ₆=2, so,

$U_{\mathrm{AA}}=\frac{400}{3+8.75}(3+8.75+3.5+7+7+2)=1064V$

In like manner, U _BB=1064V, U _CC=1064V

Like this, the line voltage that induces on contacts of contactor 8K is by the estimation of Fig. 2 vectogram, clearly

U _A’B’＝U _B’C’＝U _C’A’≈1510V

This shows that the voltage that respond on the elementary winding this moment is far longer than contactor safe insulation voltage 660V up to 1510V.

If being got in touch with contact 5K, step-down disconnects, coil Q4 then, and Q5, the inductive voltage value on the Q6 is

$U_{\mathrm{AA}}=\frac{U_{\mathrm{AB}}}{N_1+N_2}\×(N_4+N_5+N_6)=\frac{400}{3+8.75}(7+7+2)=545V$

In like manner, obtain by the reckoning of the vectogram among Fig. 2:

U _A’B’＝U _B’C’＝U _C’A’≈630V

This shows, owing to adopted being connected of step-down contact contact 5K disjunction intermediate coil Q3 and Q4, the bucking coil of a plurality of serial connections is divided into two sections of front and back, makes under extreme case, the alternate induced voltage between the contact of each contactor is below 660V safe insulation voltage.Therefore, under the situation of not using leading portion or back segment bucking coil Q1, Q2, Q3 or Q4, Q5 and Q6, by step-down contact contact 5K, the section coil is fallen induced voltage before or after disconnecting.

Certainly, in elementary bucking coil Q1～Q6, if the number of turn of each coil is few, the induced voltage of compensation winding then can be cancelled the middle step-down contact contact 5K of compensation winding less than 660V during work, and with its short circuit, circuit working is normal.

Below with regard to the flicker operation principle of arc coil Q1 and Q6 of the circuit of Fig. 2:

Suppose that former compensating coefficient is compensation during 0 grade of voltage, i.e. contact 1K, 5K, 8K closure, 2K disconnects; If when needing the positive one grade of voltage of compensation, compensating coefficient should forward contact 2K, 5K, 8K closure to, contact 1K is in the process of disjunction, will inevitably produce electric arcing, if coil Q1 cancellation, promptly during the N1=0 circle, the electric arcing that produces as contact 1K is bigger, and before not extinguishing fully as yet, the closure of contact 2K can make 1K electricity arcing restrike, and short trouble between A and the zero line N takes place.But, because the present invention has coil Q1 to exist, even the electric arcing of contact 1K is bigger, and before not extinguishing fully as yet, contact 2K closure, this moment is because the induction reactance of coil Q1 produces the effect of inverse electromotive force, electric current can not be suddenlyd change, and this electricity arcing can not restriked, and plays the effect of extinguishing arc.And this extinguishing arc effect has obtained proof in practice.Therefore, solved contacts of contactor effectively in the bucking coil process of switching, because of the electric arcing problem of fault of being short-circuited of restriking.The setting of coil Q6 and operation principle are identical with coil Q1's, repeat no more.

In sum, each mutually elementary compensation winding of three-phase compensator transformer T can be provided with corresponding many coil and tap, with scope and the control precision that satisfies voltage regulation of voltage regulation, the contactor of control circuit also can be provided with a plurality of as required, contacts of contactor wherein, be above-mentioned control contact, also can adopt the noncontacting switch device of other type, as switching tube and silicon-controlled device etc.The structure of circuit is also a lot, no matter adopt which kind of scheme, is serially connected with the structure that contact contactor (switch) control break-make is arranged between arc extinguishing winding or the elementary winding of two parts between the switching device circuit switched as long as adopted, and all constitutes infringement of the present utility model.

Claims (2)

1, a kind of structure of three-phase voltage regulator device compensating coil drop induction voltage, it comprises the control contact of the every mutually a plurality of serial connection primary winding coils of compensator transformer, control circuit and each described coil tap of control thereof, it is characterized in that also comprising:

Between two coils in the middle of the elementary bucking coil of described a plurality of serial connections, be provided with step-down contact contact, a plurality of serial connection bucking coils are divided into two sections of front and back.

2, a kind of structure of three-phase voltage regulator device bucking coil contact arc-suppression, it comprises the control contact of the every mutually a plurality of serial connection primary winding coils of compensator transformer, control circuit and each described coil tap of control thereof, it is characterized in that also comprising:

At the two ends of the elementary bucking coil of described a plurality of serial connections, be connected in series an arc suppression coil respectively again, the two ends of this arc suppression coil are the control of controlled contact also.