CN2817208Y

CN2817208Y - AC magnetic-control type soft start device for high voltage motor

Info

Publication number: CN2817208Y
Application number: CN 200520020148
Authority: CN
Inventors: 徐金哲
Original assignee: SHIJI JINGQI TECH CO LTD HARBIN
Current assignee: SHIJI JINGQI TECH CO LTD HARBIN
Priority date: 2005-01-25
Filing date: 2005-01-25
Publication date: 2006-09-13
Anticipated expiration: 2015-01-25

Abstract

The utility model presents an AC magnetic control type soft start device for a high voltage motor. The utility model can effectively decrease the starting current of a motor, and reduce the impact to a machinery mechanism when the motor starts. The voltage waveform has no interruption when the motor starts, and the torque of the motor is effectively increased. A main loop is composed of a high voltage controlled reactor T<A>, a high pressure vacuum circuit breaker J 1, a high pressure vacuum circuit breaker J 2, a thyristor G 1 and a thyristor G 2; by controlling triggering angles of the thyristor G 1 and the thyristor G 2, the voltage of the motor M 1 can be changed from low to high, until the voltage of the motor M 1 is the same with the supply voltage; thus, the purpose of soft starting of the motor is obtained.

Description

The AC magnetic controlled formula soft starter device of high-tension motor

Technical field

The utility model relates to the AC magnetic controlled formula soft starter device of a kind of high-tension motor, realizes the soft start to high-tension motor.

Technical background

Along with China's development of economic construction, the Electric Traction equipment of high-voltage large-capacity is increasing, and wherein to drag development particularly rapid in the interchange of 10KV (6KV).The matter of utmost importance of the alternating current machine operation of the big-and-middle capacity of high pressure is starting, though advantages such as across-the-line starting has simply, economy, starting time weak point, but starting current big (being generally 5～7 times of rated current), it also is the serious problems that can not be ignored that the overcurrent to electrical network and motor that therefore brings impacts.Facts have proved, even net capacity allows across-the-line starting, the harm that its across-the-line starting electric current impacts the thermal shock and the electric power of motor generation also is great, even the motor across-the-line starting is in tens seconds short time, temperature is sharply risen about 150 ℃, often cause motor to damage or reduce useful life, particularly when the load force on the motor shaft apart from greatly the time, starting time will increase, and the harm of across-the-line starting is bigger.In addition, some equipment and technological requirement starting are mild, and across-the-line starting produces to impact to equipment and causes damage, perhaps influences product quality, and this just need draw attention to the electric motor starting performance.At present, the high-voltage motor development of China is very fast, and the starting equipment that matches with it is more outmoded, though traditional controlled reactor reduced voltage starting, across-the-line starting can obtain bigger starting torque under same starting conditions, but it is level and smooth to be difficult to satisfy starting, impact little requirement, and cost is not low yet.There is a kind of calling off to close transformer type flexibly starting high voltage motor and speed regulating device (patent No. 01259830.5) at present, what patent 01259830.5 was used between motor and electrical network is that transformer comes step-down, and motor one terminal voltage is adjustable to line voltage from very low (basically near 0v), therefore cause cost height, control loop electric current big, and it is unfavorable to motor during the too low starting of voltage, cause big electric current easily, burn motor.And this patent uses between motor and electrical network is that AC magnetic controlled formula controlled reactor comes step-down, and the terminal voltage of motor is to begin to rise from about 50% line voltage, helps motor starting, and manufacturing cost is about 1/3 of a patent 01259830.5.

Summary of the invention

In order effectively to reduce the cost that motor starting impacts and reduce starting equipment; the utility model proposes the AC magnetic controlled formula soft starter device of a kind of high-tension motor; use this device not only to impact little to electrical network; and motor starting is mild; generation is impacted little to equipment; prolong the useful life of motor, motor has been played protective effect, cost is low.

Technical solutions of the utility model are: major loop is by three-phase high-voltage controlled reactor T _A, high-pressure vacuum breaker J ₁, high-pressure vacuum breaker J ₂, thyristor G ₁, thyristor G ₂Constitute, as shown in Figure 1.High pressure controlled reactor T _A, high-pressure vacuum breaker J ₁, high-pressure vacuum breaker J ₂Be the three-phase element, just receive power supply A phase part among the figure, other two-phases are mutually identical with A.M ₁Receive one of motor and go up mutually, other two-phases are mutually identical with A.Control loop adopts power supply synchronization method, as shown in Figure 2, and by synchrotrans TR ₁, resistance R ₁, R ₂, diode D, photoelectrical coupler O constitutes, and is A phase part among the figure, and other two-phases are mutually identical with A.

T _ABe the three-phase high-voltage controlled reactor, add the control winding in its magnetic loop, control winding and high-pressure side insulation are if the soft starter output voltage is since the rising of 60% supply voltage, then three-phase high-voltage controlled reactor T _AHigh-pressure side voltage be set to 40% supply voltage, the control winding terminal is set to 380V between the 2000V, also can just receive power supply A phase part among the figure according to the design of other voltage ratio, other two-phases are mutually identical with A.

Synchrotrans TR ₁Be three-phase transformer, just receive power supply A phase part among the figure, the mutually identical input voltage with A of other two-phases is identical with line voltage, and output is 380v or 220v.

The beneficial effects of the utility model are, not only can reduce the starting current of motor effectively, and to the impact of mechanical mechanism, and voltage waveform is not interrupted during starting, effectively raises the moment of torsion of motor when reducing to start.

Description of drawings

Accompanying drawing 1 is the utility model major loop electrical schematic diagram.

Accompanying drawing 2 is the utility model control loop synchronized sampling electrical schematic diagrams.

Embodiment

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

Among Fig. 1, T _ABe the three-phase high-voltage controlled reactor, A is the A phase firewire in the three-phase high-voltage alternating current, and Fig. 1 is the circuit diagram of A phase, and the mutually identical A phase firewire with A of other two-phase is received high-pressure vacuum breaker J ₁A upper end A end mutually, corresponding lower end is received high-pressure vacuum breaker J simultaneously ₂Upper end A is an end and three-phase high-voltage controlled reactor T mutually _AD ₁End, high-pressure vacuum breaker J ₂Corresponding lower end is received three-phase high-voltage controlled reactor T simultaneously _AD ₀End and motor one end M ₁, three-phase high-voltage controlled reactor T _ALow-pressure end one end receive thyristor G simultaneously ₁Positive pole and thyristor G ₂Negative pole or receive thyristor G simultaneously ₁Negative pole and thyristor G ₂Positive pole, three-phase high-voltage controlled reactor T _AThe low-pressure end other end is received thyristor G simultaneously ₁With thyristor G ₂The other end.

Among Fig. 2, with synchrotrans TR ₁Be connected to power supply A and be connected to synchrotrans TR for example power supply A mutually ₁A import head end A mutually, the three-phase of three-phase synchrotrans input end connects together and is x.Synchrotrans TR ₁A phase low-voltage output a be connected to resistance R ₁, synchrotrans TR ₁Three-phase low pressure output end link together and be N.Resistance R ₁The other end be connected to the positive pole of diode D and the input side negative pole of photoelectrical coupler O simultaneously, or be connected to the negative pole of diode D and the input side positive pole of photoelectrical coupler O simultaneously, the input side other end of diode D and photoelectrical coupler O is connected to N simultaneously.Monolithic computer power supply+5v is connected to resistance R ₂An end, resistance R ₂The other end be connected to the collector terminal E of monolithic computer pin P and photoelectrical coupler O outlet side simultaneously, the emitter terminal of photoelectrical coupler O is connected to the ground wire G of monolithic computer, is the collector electrode way of output.Photoelectrical coupler O also can adopt the emitter-base bandgap grading way of output.

Among Fig. 2, diode D also can be replaced by the photoelectrical coupler with the same model of photoelectrical coupler O, and photoelectrical coupler O can adopt active photoelectrical coupler, also can adopt passive photoelectrical coupler.

The course of work of the present utility model is, as high-pressure vacuum breaker J ₁After powering on, three-phase high-voltage controlled reactor T _ACharged, the voltage on the motor is approximately 50% supply voltage, and this moment, motor began starting, at this moment thyristor G ₁With thyristor G ₂There is not conducting, three-phase high-voltage controlled reactor T _ABe equivalent to a three pole reactor element, three-phase high-voltage controlled reactor T _AD ₁, D ₀Between voltage be approximately 50% supply voltage, this moment thyristor G ₁With thyristor G ₂The value calculated according to control loop of trigger angle, begin descendingly to begin to change, simultaneously motor one end M according to certain curve ₁On voltage also increase along with beginning by minimum, up to motor one end M ₁On voltage identical with supply voltage, high-pressure vacuum breaker J afterwards ₂Adhesive, this moment, motor starting finished.

Claims

1, the AC magnetic controlled formula soft starter device of a kind of high-tension motor, high pressure controlled reactor T _A, high-pressure vacuum breaker J ₁, high-pressure vacuum breaker J ₂, thyristor G ₁, thyristor G ₂, synchrotrans TR ₁, resistance R ₁, diode D, photoelectrical coupler O, resistance R ₂Order is electrically connected, and it is characterized in that the A phase firewire receives high-pressure vacuum breaker J ₁A upper end A end mutually, corresponding lower end is received high-pressure vacuum breaker J simultaneously ₂Upper end A is an end and three-phase high-voltage controlled reactor T mutually _AD ₁End, high-pressure vacuum breaker J ₂Corresponding lower end is received three-phase high-voltage controlled reactor T simultaneously _AD ₀End and motor one end M ₁, three-phase high-voltage controlled reactor T _ALow-pressure end one end receive thyristor G simultaneously ₁Positive pole and thyristor G ₂Negative pole or receive thyristor G simultaneously ₁Negative pole and thyristor G ₂Positive pole, three-phase high-voltage controlled reactor T _AThe low-pressure end other end is received thyristor G simultaneously ₁With thyristor G ₂The other end.

2, the AC magnetic controlled formula soft starter device of high-tension motor according to claim 1 is characterized in that power supply A is connected to synchrotrans TR ₁A import head end A mutually, the three-phase of three-phase synchrotrans input end connects together and is x, synchrotrans TR ₁A phase low-voltage output a be connected to resistance R ₁, synchrotrans TR ₁Three-phase low pressure output end link together and be N, resistance R ₁The other end be connected to the positive pole of diode D and the input side negative pole of photoelectrical coupler O simultaneously, or be connected to the negative pole of diode D and the input side positive pole of photoelectrical coupler O simultaneously, the input side other end of diode D and photoelectrical coupler O is connected to N simultaneously, and monolithic computer power supply+5v is connected to resistance R ₂An end, resistance R ₂The other end be connected to the collector terminal E of monolithic computer pin P and photoelectrical coupler O outlet side simultaneously, the emitter terminal of photoelectrical coupler O is connected to the ground wire G of monolithic computer.