CN201122919Y - Resistance-capacitance type soft starter - Google Patents
Resistance-capacitance type soft starter Download PDFInfo
- Publication number
- CN201122919Y CN201122919Y CNU200720033005XU CN200720033005U CN201122919Y CN 201122919 Y CN201122919 Y CN 201122919Y CN U200720033005X U CNU200720033005X U CN U200720033005XU CN 200720033005 U CN200720033005 U CN 200720033005U CN 201122919 Y CN201122919 Y CN 201122919Y
- Authority
- CN
- China
- Prior art keywords
- resistance
- capacitance type
- type soft
- switch
- reduction voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a resistance-capacitance type soft starter. The resistance-capacitance type soft starter provided by the utility model comprises a switch and a voltage step-down circuit connected with the switch in series, the voltage step-down circuit comprises a voltage step-down switch and a voltage step-down resistor, and the voltage step-down switch and the voltage step-down resistor are connected in parallel. The utility model provides the resistance-capacitance type soft starter in which the start-up process is controllable, and which can realize the one-to-more.
Description
Technical field
The utility model relates to a kind of resistance-capacitance type soft initiator.
Background technology
3,6, to produce bigger impulse current (be generally rated current Ie 5～8 times) during the direct-on-line starting of 10KV high-tension motor.Motor capacity is big more, and impulse current is just big more to electrical network and load shock thereof during starting, and particularly large-size machine across-the-line starting meeting causes interference to electrical network and other loads, even the safe operation of harm electrical network; Because a dynamic stress is bigger, reduced the useful life of load equipment simultaneously.
Solution has two: the one, increase distribution capacity; The 2nd, adopt the starting equipment that limits the electric motor starting electric current.Iff for actuating motor increases distribution capacity,, obviously inadvisable from economic angle.And common the having of start mode of employing restriction electric motor starting electric current:
Adopt variable frequency starting.Its critical piece is a frequency converter.Frequency converter be the 50HZ in the electrical network week wave voltage through rectification and inversion, the frequency of exportable any needs.Frequency converter is serially connected in before the motor, when motor starting, increases the electric energy frequency of input gradually by frequency converter, make the slow raising speed of motor, make the starting process of motor become " soft ", progressively finish to rated speed, to reduce impact electrical network by low speed.But there is following shortcoming in this Starting mode:
1, pollute easily, the frequency conversion of frequency converter all realizes by instantaneous opening and closing thyristor.Conversion process can produce a large amount of high order harmonic components, has polluted electrical network.West advanced country explicit order limits the use of.
2, cost height.The operation maintenance specification requirement of frequency converter is very high, and price also is difficult to be accepted by market.About 1000～2000 yuan of every KW.The high-tension motor of a 1000KW just needs 180～2,000,000 yuan, is 3～4 times of high-tension motor price, does not meet the needs of real work.
Adopt reduced-voltage starting.This kind Starting mode is reactance of front end serial connection or the resistance at high-tension motor, makes it share a part of line voltage, thereby reduces the voltage that adds to motor, reduce starting current, gradually reduce the resistance of reactance or resistance, just can promote the voltage that adds to motor gradually, realize soft start.Reduced-voltage starting mainly contains following several mode:
1, use the reactance step-down, mode commonly used is to add DC excitation to the reactance iron core, changes the saturation of reactance, and reactance value is changed.This mode still can produce high order harmonic component and pollute electrical network, is subjected to effect of saturation degree simultaneously, and range of regulation is little.It also easily causes electrical network generation resonance overvoltage accident, occurs potential safety hazard easily.
2, use the water resistance step-down, this mode is to utilize liquid resistance temperature behind galvanization of special configuration to raise, and water resistance descends and realizes pressure regulation.When adopting this kind mode, the process of water resistance soft start is uncontrollable, can not heavily cover continuous use; Its water power Standard resistance range that influenced by water temperature is less simultaneously, and range of regulation is little, and maintenance workload is big, is subject to the ambient temperature effect in season, is difficult to realize soft stop.But current limliting but not energy-conservation can not be used for large capacity motor etc., and its shortcoming is very obvious, is difficult to promote.
And no matter above which kind of Starting mode when being connected with multiple motors on one section bus of electrical network, disposing one alone all must for every motor and overlap high volt starter.So not only increase the cost of high voltage startup greatly, increased maintenance and floor space simultaneously.
The utility model content
The utility model is for solving the problems referred to above that exist in the background technology, and provide a kind of start-up course controlled, can realize that one drags many resistance-capacitance type soft initiators.
Technical solution of the present utility model is: the utility model is a kind of resistance-capacitance type soft initiator, comprise switch, its special character is: described resistance-capacitance type soft initiator also comprises the reduction voltage circuit of connecting with switch, reduction voltage circuit comprises step-down switching and dropping resistor, step-down switching and dropping resistor parallel connection.
Above-mentioned reduction voltage circuit is one or more.
Above-mentioned reduction voltage circuit is parallel with shunt circuit, and shunt circuit comprises shunt resistance and diverting switch, and shunt resistance is connected with diverting switch.
Above-mentioned shunt circuit of connecting with reduction voltage circuit is one or more.
Above-mentioned reduction voltage circuit is in series with coupling circuit, and coupling circuit comprises coupled switch and electric capacity, coupled switch and capacitances in series.
Above-mentioned step-down switching, diverting switch and coupled switch all adopt contactor.
Above-mentioned dropping resistor and shunt resistance all adopt non-metallic resistor.
The utlity model has following advantage:
1, start-up course is controlled.The utility model can be as required; connect a plurality of reduction voltage circuits or a plurality of shunt circuit in parallel or insert electric capacity; by to selectable switch of contactor and closure; realize control to start-up course; realize the soft start progressively boost or the soft stop of step-down progressively, greatly reduce starting current, the electric current of adding electric capacity on the coupling circuit replenishes; idle power consumption in the time of can reducing electric motor starting greatly also simultaneously can reduce switching overvoltage.
2, can realize automatic control.The voltage and current of the utility model start-up course fully can be by selected in advance scheme control, and whole process can be controlled by computer, the automaticity height.
3, can realize one drag many.The utility model can be realized the soft start that progressively boosts or the soft stop of step-down progressively, can realize the startup of multiple motors by a resistance-capacitance type soft initiator.
Description of drawings
Fig. 1 is the circuit theory diagrams of a specific embodiment of the present utility model.
Embodiment
Referring to Fig. 1, a specific embodiment structure of the present utility model comprises K switch 1, three reduction voltage circuits that are in series: first reduction voltage circuit is made of step-down switching K2 and dropping resistor R1 parallel connection, second reduction voltage circuit is made of step-down switching K3 and dropping resistor R2 parallel connection, the 3rd reduction voltage circuit is made of step-down switching K4 and dropping resistor R3 parallel connection, three shunt circuits: first shunt circuit in parallel and second shunt circuit and three shunt circuit in parallel with the 3rd reduction voltage circuit with second reduction voltage circuit, first shunt circuit is made of diverting switch K6 and shunt resistance R4 series connection, second shunt circuit is made of diverting switch K7 and shunt resistance R5 series connection, the 3rd shunt circuit is made of diverting switch K8 and shunt resistance R6 series connection, and the coupling circuit of connecting with the 3rd reduction voltage circuit, this coupling circuit is made of coupled switch K5 and capacitor C series connection.
Wherein, it is good that step-down switching K2, K3, K4, diverting switch K6, K7, K8 and coupled switch K5 all adopt contactor.It is good that dropping resistor R1, R2, R3 and shunt resistance R4, R5, R6 all adopt metal or non-metallic resistor.
As can be seen from the figure, the utility model can comprise the reduction voltage circuit of a plurality of series connection, and present embodiment is 3, and each reduction voltage circuit can be parallel with a plurality of shunt circuits, in the present embodiment the 3rd reduction voltage circuit parallel connection two shunt circuits.But, be good with the hierarchic structure in the present embodiment according to real work needs flexible combination.
During the utility model work, when the K1 closure, when K2, K3, K4 disconnection, electric current process R1, R2, R3, when realizing step-down, K6, K7 closure, electric current is through R4, R5, R6, and realization is shunted, and by control K5 closure, electric current enters the further current limliting of capacitor C; Realize gradually boosting by control K2, K3, K4 are closed respectively gradually this moment, the closed K2 of elder generation, and electric current only passes through R2, R3, R4, R5, R6, closed again K3, electric current only passes through R3, R5, R6, and the realization soft start progressively boosts.In like manner, during shutdown,, disconnect respectively gradually by control K2, K3, K4 again, realize step-down gradually when K1 disconnects; At this moment the current reflux in the capacitor C replenishes.Soft start and soft stop have been realized through this process.
Claims (7)
1, a kind of resistance-capacitance type soft initiator comprises switch, it is characterized in that: described resistance-capacitance type soft initiator also comprises the reduction voltage circuit of connecting with switch, and described reduction voltage circuit comprises step-down switching and dropping resistor, described step-down switching and dropping resistor parallel connection.
2, resistance-capacitance type soft initiator according to claim 1 is characterized in that: described reduction voltage circuit is one or more.
3, resistance-capacitance type soft initiator according to claim 2, it is characterized in that: described reduction voltage circuit is parallel with shunt circuit, and described shunt circuit comprises shunt resistance and diverting switch, and described shunt resistance is connected with diverting switch.
4, resistance-capacitance type soft initiator according to claim 3 is characterized in that: described shunt circuit of connecting with reduction voltage circuit is one or more.
5, according to the described resistance-capacitance type soft initiator of the arbitrary claim of claim 1 to 4, it is characterized in that: described reduction voltage circuit is in series with coupling circuit, and described coupling circuit comprises coupled switch and electric capacity, described coupled switch and capacitances in series.
6, resistance-capacitance type soft initiator according to claim 5, it is characterized in that: described step-down switching, diverting switch and coupled switch all adopt contactor.
7, resistance-capacitance type soft initiator according to claim 5, it is characterized in that: described dropping resistor and shunt resistance all adopt metal or non-metallic resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720033005XU CN201122919Y (en) | 2007-11-30 | 2007-11-30 | Resistance-capacitance type soft starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720033005XU CN201122919Y (en) | 2007-11-30 | 2007-11-30 | Resistance-capacitance type soft starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201122919Y true CN201122919Y (en) | 2008-09-24 |
Family
ID=40010160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720033005XU Expired - Fee Related CN201122919Y (en) | 2007-11-30 | 2007-11-30 | Resistance-capacitance type soft starter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201122919Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2489120A2 (en) * | 2009-10-13 | 2012-08-22 | MTU Friedrichshafen GmbH | Generating set preloader |
| CN112653335A (en) * | 2020-12-08 | 2021-04-13 | 华为技术有限公司 | Power conversion circuit, control method of power conversion circuit and transformer |
-
2007
- 2007-11-30 CN CNU200720033005XU patent/CN201122919Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2489120A2 (en) * | 2009-10-13 | 2012-08-22 | MTU Friedrichshafen GmbH | Generating set preloader |
| CN112653335A (en) * | 2020-12-08 | 2021-04-13 | 华为技术有限公司 | Power conversion circuit, control method of power conversion circuit and transformer |
| US11909308B2 (en) | 2020-12-08 | 2024-02-20 | Huawei Digital Power Technologies Co., Ltd. | Power conversion circuit, method for controlling power conversion circuit, and transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103419679B (en) | A kind of Vv wiring cophase supply power transformation structure | |
| CN201122919Y (en) | Resistance-capacitance type soft starter | |
| CN203278710U (en) | Novel magnetic control device of motor-type microcomputer | |
| CN202673731U (en) | Frequency conversion energy-saving control system of dust removal draught fan | |
| CN201690400U (en) | Frequency-conversion soft-start hybrid power cabinet | |
| CN203289169U (en) | Pre-charging device of power unit cascaded high-voltage inverter | |
| CN203339999U (en) | Mining flameproof and intrinsically safe type double loop soft starter | |
| CN201328095Y (en) | Mineral flame-proof type variable-frequency high-voltage soft start device | |
| CN204967633U (en) | Oil field beam -pumping unit is with energy -conserving direct current contravariant terminal cabinet | |
| CN203883721U (en) | Oil pumping machine self-starting permanent magnet synchronous motor compensating type voltage regulator | |
| CN201044363Y (en) | Three-phase electricity economizer | |
| CN204906232U (en) | Three -phase asynchronous motor reduced -voltage starting and operation reactive compensation circuit | |
| CN203027169U (en) | Dropping-compensation solid soft starting device for axial-flow compressor | |
| CN208386445U (en) | Electric system and motor frequency conversion control circuit | |
| CN102611362B (en) | High-voltage soft start main circuit | |
| CN202309071U (en) | Drawer modular active power filtering device | |
| CN207184328U (en) | The power-supply system and power cell of a kind of power cell | |
| CN201199634Y (en) | Electric network positive-negative reactive compensator | |
| CN206908533U (en) | A kind of motor intelligent power-saving Soft Starting System | |
| CN2731805Y (en) | Three-phase power saving device having regulation function | |
| CN108631651A (en) | A kind of electric system and motor frequency conversion control circuit | |
| CN203415985U (en) | Intelligent energy-saving control device system | |
| CN101651440B (en) | High-voltage large-power electromotor starter with feedback type power-saving and pressurization function | |
| CN203522190U (en) | Rural power line voltage flexible compensation apparatus based on multi-winding transformation | |
| CN203871944U (en) | Motor with additional inductance coil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080924 Termination date: 20131130 |