CN101651439A - Switch autotransformer type intermediate and high voltage motor soft start device - Google Patents

Switch autotransformer type intermediate and high voltage motor soft start device Download PDF

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Publication number
CN101651439A
CN101651439A CN200910071950A CN200910071950A CN101651439A CN 101651439 A CN101651439 A CN 101651439A CN 200910071950 A CN200910071950 A CN 200910071950A CN 200910071950 A CN200910071950 A CN 200910071950A CN 101651439 A CN101651439 A CN 101651439A
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CN
China
Prior art keywords
soft
voltage
motor
switch
autotransformer
Prior art date
Application number
CN200910071950A
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Chinese (zh)
Inventor
王宇
孙向瑞
潘政刚
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哈尔滨帕特尔科技有限公司
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Priority to CN200910071950A priority Critical patent/CN101651439A/en
Publication of CN101651439A publication Critical patent/CN101651439A/en

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Abstract

The invention relates to a three-phase AC switch autotransformer type intermediate and high voltage motor soft start device which belongs to the technical field of power electronics. The invention overcomes the defects that the prior intermediate and high voltage (1-35kV) motor soft start device is limited by the voltage resistance of a power electronic device and needs series and parallel connection, and other equipment has larger volume, poor regulating performance and large self pressure drop, and the like. The three-phase AC switch autotransformer type intermediate and high voltage motor soft start device comprises an autotransformer (TK), thyristors (SCR1, SCR2) or a full control type power electronic device, breakers (QF1, QF2), a controller (PLC or other intelligent controllers) anda trigger system, wherein one end of a soft start switch QF1 is connected with a power grid, and the other end is connected with the initial end of the autotransformer; a middle tap of the three-phase autotransformer and the tail end form a closed loop by the thyristors (controllable silicon); the tail end of the autotransformer is connected with a high voltage motor (M); one end of a running switch QF2 is connected to the power grid, and the other end is connected to the high voltage motor (M). The end voltage of the motor (M) can be changed by carrying out the phase control of the thyristors by the controller (PLC or other intelligent controllers) and the trigger system, thereby realizing soft start. The invention can smoothly regulate the end voltage and current of the high voltage motor in a stepless way, reduces the fluctuation of power grid voltage and has simple structure, reliable performance, small self pressure drop, low cost and convenient use and maintenance.

Description

Switch auto-transformer type mesohigh motor soft start device

Technical field:

The invention belongs to electric and electronic technical field, be specifically related to a kind of switch auto-transformer type mesohigh motor soft start device.

Technical background:

At present (1~35KV) large capacity motor soft start need be adopted reduced voltage starting or soft-start mode to mesohigh, the impact that electrical network and plant equipment is produced when reducing electric motor starting.The electric motor starting mode of current normal employing has liquid resistance reduced voltage starting mode, controllable silicon series connection soft-start mode, high voltage converter soft-start mode etc., above variety of way respectively has drawback, adopts that liquid resistance reduced voltage starting mode exists that volume is big, maintenance workload big, control is inaccurate, repeatable accuracy is poor, problem such as big affected by environment; Adopt controllable silicon series connection soft-start mode to have shortcomings such as reliability is low, harmonic content height; Though adopt the variable frequency soft start mode more satisfactory exist cost an arm and a leg, technical difficulty is big, maintenance cost is high, extensive popularization is than defectives such as difficulties.

Switching transformer type mesohigh flexible starter for electric motor and speed regulating device (the ZL patent No. 01259830.5) have been invented in calendar year 2001 by my company, it is the improvement to controllable silicon tandem mesohigh motor soft start device, need not the controllable silicon series connection, have advantages such as reliability height, high order harmonic component are little to the power source bus influence, the thyristor triggering system need not be isolated, but also have the high market competitiveness, the shortcoming that the short circuit pressure drop is bigger of lacking of cost.

Summary of the invention and beneficial effect:

The invention reside in the deficiency that overcomes existing starting device, provide a kind of can be level and smooth stepless wide region to regulate the soft starter device of large-size machine starting current, voltage, reduction is to the impact of electrical network and plant equipment, and dependable performance, cheap, the short circuit pressure drop is less, easy to maintenance.

Technical scheme of the present invention is: comprise 3-phase autotransformer TK, thyristor SCR (or all-controlling power electronics device) and controller (PLC or other intelligent controller) and triggering system etc.It is characterized in that: autotransformer three-phase centre tap is through thyristor SCR (or all-controlling power electronics device) and terminal formation closed-loop path, the autotransformer end meets high-tension motor M, by controller (PLC or other intelligent controller) and triggering system thyristor is carried out phase control.When constituting the soft start system by it, autotransformer gets access to grid through starting switch QF1, and run switch QF2 one is terminated at electrical network one and is terminated at high-tension motor M.

Phase control is that given voltage of controller (PLC or other intelligent controller) output is added on the phase place trigger board, partly the time (pilot angle) changes the ON time that given voltage can change thyristor by (angle of flow) conducting At All Other Times to phase place trigger board control thyristor in per half cycle of supply voltage.When thyristor ends, autotransformer tap (secondary) open circuit, autotransformer is Light Condition, and this moment, the supply voltage major part was added on the autotransformer, motor (M) terminal voltage very little (being equivalent to circuit disconnects); When the thyristor conducting, autotransformer tap (secondary) short circuit, autotransformer is short-circuit condition, and only present its short-circuit impedance voltage on the autotransformer this moment, motor (M) terminal voltage very big (being equivalent to circuit connects).When strengthening the angle of flow of thyristor gradually, the motor on the macroscopic view (M) terminal voltage strengthens gradually, has realized the soft start of motor (M).In the above-mentioned course of work, because the control of thyristor makes autotransformer only work in the switch two states, so we claim that this soft-start mode is the soft start of switch auto-transformer type high-voltage motor.When adopting all-controlling power electronics device to replace thyristor, need it is carried out pulse width modulation (PWM) control.

Autotransformer is a kind of special transformer, structurally a great difference is arranged with common transformer, the secondary of it formed by elementary tap, be not have electrical isolation between the primary and secondary, therefore secondary connecing between thyristor and its triggering system still has very high potential difference (identical with line voltage, when supply voltage is higher than 3KV, the triggering system of thyristor will be by trigger board, photoelectric isolating device, getting the energy device forms), this is the important difference of the present invention and switching transformer type mesohigh motor soft start device, and this makes the people be not easy to expect switch autotransformer mode; In addition this operating state of the autotransformer secondary short circuited traditional habit that never has human mistake, the present invention to break autotransformer in the past can not short circuit to use, broken through the thought binding that people fear short circuit, have an initiative meaning.

The invention has the advantages that: (1) electric machine soft starting electric current is adjustable continuously in the motor total head directly plays 0~100% scope of electric current.(2) electric moter voltage is adjustable continuously in 0~100% scope of rated voltage.(3) adjusting of starting voltage, electric current can be adopted modes such as ramp type, constant formula, first pulse, in the soft start of reality, often adopts the soft start of classification constant current mode, can limit the maximum of starting current minimumly like this.(4) because of starting current is little, so reduced impact to plant equipment and public electric wire net.(5) simple in structure, the ratio of performance to price is high, maintenance is simple, easy to use, control flexibly.Because the filter action of autotransformer leakage reactance, high order harmonic component is less to the influence of power source bus, can satisfy the GB requirement.Compare with switching transformer type mesohigh motor soft start device, have that power is little, simple in structure, the little and low cost and other advantages of short circuit pressure drop.

When the moment of inertia of load capacity very big or motor is very big, in order to satisfy the requirement of starting time, the starting current maximum is often still bigger, if this moment, net capacity was limited then can make voltage fluctuation rate bigger, can takes on power source bus, to add electric current that the way of building-out capacitor reduces to enter the electrical network bus, reduce voltage fluctuation rate in order to reduce voltage fluctuation rate.

Description of drawings:

Fig. 1 is a typical single line instance graph of the present invention

Fig. 2 is the typical single line instance graph that has building-out capacitor

Fig. 3 is a single line instance graph of expressing control system

Embodiment:

In the example of Fig. 1, TK is an autotransformer, and SCR1, SCR2 are that thyristor, QF1 are that Soft Start Switch, QF2 are the run switchs of motor M; 1 end of 3-phase autotransformer TK is connected to electrical network through Soft Start Switch QF1, and 2 ends of TK and 3 ends constitute the closed-loop path with just antiparallel thyristor, and 3 terminations are treated starting motor M simultaneously.Run switch QF2 disconnects during electric motor starting, and QF1 is in "on" position, controller (PLC or other intelligent controller) is received QF1 combined floodgate back triggering thyristor, and the angle of flow of controlling thyristor this moment is to the level and smooth stepless progressively increase output voltage of motor side, and motor begins to start and quicken.When motor speed drops to 0.8 times of rated current near rated speed or starting current, send the QF2 reclosing command, receive the QF2 back time-delay of closing a floodgate when system and disconnect QF1, at this moment the motor proceed-to-send that is incorporated into the power networks by control system.

In the example of Fig. 2 except that the above descriptive system mode of connection with set up reactive-load compensation capacitor C in the public network side and be connected to electrical network through QF3, this kind mode of connection is that reactive current is provided when giving larger capacity motor (or load rotating inertia is big) starting, further reduce large-size machine when starting rush of current to public electric wire net, the motor starting electric current that this CALCULATION OF CAPACITANCE can be born according to system calculates, can drop into the reactive current in the time of to take the circumstances into consideration to stay the capacitor compensation motor operation of a constant volume behind the proceed-to-send during starting step by step.

Except that the above descriptive system mode of connection, provided the block diagram that systems control division divides in the example of Fig. 3, PLC or other intelligent controller testing circuit condition (switching value, analog quantity) and as the voltage sensor of system's closed-loop control and the feedback quantity of current sensor, through feedback and the phase shift controlling voltage of D/A conversion output as trigger element, trigger element output pulse is through electric light/opto-electronic conversion, export the gate pole and the cathode terminal of thyristor (controllable silicon) to through amplification, this kind triggering form is thoroughly kept apart high-low pressure, Electro Magnetic Compatibility is good, system safety, stable, the power supply of electric light/photovoltaic element is that the energy power supply is got in coupling, and it is good that this kind mode has isolation performance, advantages such as Electro Magnetic Compatibility is strong.

Just several embodiments of this invention of foregoing description, various not illustrating is construed as limiting the essence of an invention content, the person of an ordinary skill in the technical field does not deviate from essence of an invention and scope having read modification or the distortion of behind the specification aforesaid embodiment being made.

Claims (5)

1. switch auto-transformer type mesohigh (1~35KV) motor soft start device, comprise 3-phase autotransformer (TK), just antiparallel thyristor (SCR1, SCR2) or all-controlling power electronics device, controller (PLC or other intelligent controller) and triggering system, the centre tap that it is characterized in that autotransformer is through thyristor (SCR1, SCR2) or all-controlling power electronics device and terminal constitute the closed-loop path, the autotransformer end connects high-tension motor (M), controller and triggering system are to thyristor (SCR1, SCR2) or all-controlling power electronics device to carry out phase control or pulse-width modulation (PWM) control be the terminal voltage of scalable motor (M), thereby realize soft start.
2. switch auto-transformer type mesohigh motor soft start device according to claim 1, it is characterized in that when constituting the soft start system, also having Soft Start Switch (QF1) and run switch (QF2) by it, Soft Start Switch (QF1) termination electrical network one termination autotransformer top, run switch (QF2) termination electrical network one termination high-tension motor (M).
3. switch auto-transformer type mesohigh motor soft start device according to claim 1, it is characterized in that controller (PLC or other intelligent controller) and triggering system and voltage sensor and/or current sensor constitute closed-loop control system, its Control Software is selected in conjunction with concrete condition.
4. switch auto-transformer type mesohigh motor soft start device according to claim 1, when it is characterized in that moment of inertia when load is very big, the way that can take to add building-out capacitor on power source bus reduces to enter the electric current of electrical network bus, further to reduce voltage fluctuation rate.
5. switch auto-transformer type mesohigh motor soft start device according to claim 1 is characterized in that when supply voltage is higher than 3KV, the triggering system of thyristor by trigger board, photoelectric isolating device, get and can device form.
CN200910071950A 2009-05-05 2009-05-05 Switch autotransformer type intermediate and high voltage motor soft start device CN101651439A (en)

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Application Number Priority Date Filing Date Title
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101860285A (en) * 2010-05-11 2010-10-13 宁波高新区宁变电力设备有限公司 Autotransformer device and starting method for soft start of high-power motor
CN102097984A (en) * 2011-02-28 2011-06-15 高越农 Quasi-saturated reactor high-voltage electric motor soft start device
CN102832857A (en) * 2012-08-16 2012-12-19 宁波大学 Novel soft starter of motor
CN103683294A (en) * 2012-09-21 2014-03-26 哈尔滨帕特尔科技股份有限公司 Adjustable reactor type voltage regulating and stabilizing device
CN103872891A (en) * 2013-12-13 2014-06-18 中煤科工集团重庆研究院有限公司 Industrial frequency transformer impact current suppression circuit, industrial frequency transformer and intrinsically safe power supply
CN104426383A (en) * 2013-08-29 2015-03-18 大禹电气科技股份有限公司 Autotransformer voltage regulator circuit
CN109889103A (en) * 2019-02-26 2019-06-14 杭州福斯达深冷装备股份有限公司 A kind of adaptive soft-start by lowering voltage device and its control method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101860285A (en) * 2010-05-11 2010-10-13 宁波高新区宁变电力设备有限公司 Autotransformer device and starting method for soft start of high-power motor
CN102097984A (en) * 2011-02-28 2011-06-15 高越农 Quasi-saturated reactor high-voltage electric motor soft start device
CN102097984B (en) * 2011-02-28 2013-11-06 大禹电气科技股份有限公司 Quasi-saturated reactor high-voltage electric motor soft start device
CN102832857A (en) * 2012-08-16 2012-12-19 宁波大学 Novel soft starter of motor
CN102832857B (en) * 2012-08-16 2015-08-05 宁波大学 A kind of Novel soft starter of motor
CN103683294A (en) * 2012-09-21 2014-03-26 哈尔滨帕特尔科技股份有限公司 Adjustable reactor type voltage regulating and stabilizing device
CN104426383A (en) * 2013-08-29 2015-03-18 大禹电气科技股份有限公司 Autotransformer voltage regulator circuit
CN103872891A (en) * 2013-12-13 2014-06-18 中煤科工集团重庆研究院有限公司 Industrial frequency transformer impact current suppression circuit, industrial frequency transformer and intrinsically safe power supply
CN103872891B (en) * 2013-12-13 2016-05-04 中煤科工集团重庆研究院有限公司 Industrial Frequency Transformer dash current suppresses circuit, Industrial Frequency Transformer and intrinsic safety electric source thereof
CN109889103A (en) * 2019-02-26 2019-06-14 杭州福斯达深冷装备股份有限公司 A kind of adaptive soft-start by lowering voltage device and its control method

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Open date: 20100217