CN201781454U

CN201781454U - Energy-saving device for starting equipment far away from power supply

Info

Publication number: CN201781454U
Application number: CN201020518328XU
Authority: CN
Inventors: 任兴乾
Original assignee: BAOJI HEERKE ELECTRON Co Ltd
Current assignee: BAOJI HEERKE ELECTRON Co Ltd
Priority date: 2010-09-06
Filing date: 2010-09-06
Publication date: 2011-03-30
Anticipated expiration: 2020-09-06

Abstract

The utility model provides an energy-saving device for starting equipment far away from a power supply. The energy-saving device comprises a rectifying control unit and an inversion unit, wherein the input end of the rectifying control unit is connected with a three-phase power supply of a power grid, and the output end of the rectifying control unit is connected with the input end of the inversion unit; and the output end of the inversion unit is directly connected with the input end of a three-phase asynchronous alternating-current motor. The energy-saving device has the advantages that since the techniques of rectifying filtering, direct current delivery, frequency conversion control and the like are adopted, the problem of starting and operating the alternating-current electric equipment far away from the power supply is skillfully and completely solved, and the energy-saving effect is obvious.

Description

Be used for energy saver away from the power-supply device startup

Technical field

The utility model relates to a kind of energy saver that is used for away from the power-supply device startup.

Background technology

Employed equipment (referring to motor-driven equipment especially) positions such as bridge tunel engineering, bargh, mountain area or field disperse and are far away apart from power supply (transformer), usually can't normally start and move.This is because alternating current when carrying at a distance, line loss and pressure drop are very big, the actual voltage that obtains of power consumption equipment is far below rated voltage, and the plant capacity that these occasions are used is often very big, itself starts just very difficult, add long distance, more can't start, for this reason, FU often adopts the method for changing super large line footpath cable even setting up transformer to solve, have high input, energy consumption height, length consuming time, and be difficult to thoroughly solve.

The utility model content

The technical problem that the utility model solves: a kind of energy saver that is used for away from the power-supply device startup is provided, adopt rectifying and wave-filtering, direct current to send technology such as electricity, variable frequency control, ingenious and the thorough startup operation problem that has solved away from the AC electric equipment of power supply, and obvious energy-saving effect is arranged.

The technical solution adopted in the utility model: the energy saver away from power-supply device starts, constitute by rectification control unit and inversion unit, the input of rectification control unit is connected with the electrical network three phase mains, and the input of its output and inversion unit joins; The output of inversion unit directly connects the input of phase asynchronous alternating current motor.

Described rectification control unit is opened ZK1 by the input of rectifier bridge battle array through sky and is linked to each other with electrical network three phase mains R, S, T, the cathode output end of described rectifier bridge battle array connects the positive pole of filter capacitor I through the normally opened contact of A.C. contactor KM, the cathode output end of rectifier bridge battle array connects the negative pole of filter capacitor I, and the normally opened contact of A.C. contactor KM also meets charging resistor R1; Filter capacitor I two termination lead-out terminal P, N; The input of Switching Power Supply and rectification control is connected to filter capacitor I two ends, the coil of the output relay termination K of Switching Power Supply and rectification control; The coil of A.C. contactor KM is connected with input side R, S through the normally opened contact of relay K.

The positive-negative input end of described inversion unit joins with the positive-negative output end of rectification control unit respectively through the empty ZK2 that opens; Electrode input end of inversion unit joins through the normally opened contact of D.C. contactor KM1 and the positive pole of filter capacitor II, and the positive pole that the negative pole of inversion unit is gone into terminal and filter capacitor II joins, and the normally opened contact of D.C. contactor KM1 also meets charging resistor R2; Filter capacitor II two termination inverter bridge battle arrays and Switching Power Supply and time-controlled input, the output termination lead-out terminal U of inverter bridge battle array, V, W, lead-out terminal U, V, W directly connect the motor input; The coil of Switching Power Supply and time-controlled output relay termination K1; The coil of D.C. contactor KM1 joins through normally opened contact and power supply V1, the V1+ of relay K 1, as the control loop of D.C. contactor KM1; MCU and system are controlled to be single-chip minimum system, and its power supply input connects Switching Power Supply and timing controlled, and the control output of MCU and system's control connects PWM and drive controlling; The output termination inverter bridge battle array of PWM and drive controlling.

The output of the input termination input reactance device of described rectification control unit, the input termination sky of input reactance device is opened the output of ZK1.

The electrode input end of the output side joint direct current reactor of described D.C. contactor KM1 normally opened contact, the negative input of rectification control unit connects the negative input of direct current reactor, and the positive-negative output end of direct current reactor connects the both positive and negative polarity of filter capacitor II respectively.

The input of described inversion unit also connects the input of brake unit, the output termination brake resistance R3 of brake unit.

The utility model advantage compared with prior art:

1, adopts the direct current supply pattern, reduce supply line's loss and line drop significantly; And long-distance transmission line is kept to two by four, and only power transmission line is just saved considerable expense;

2, improve motor power factor and device efficiency;

3, realize electric machine soft starting, the alternating current machine that has thoroughly solved away from power supply starts difficulty and operation energy consumption issues;

4, realize alternating current machine stepless speed regulation, improve motor performance and equipment performance, prolong the useful life of motor and equipment;

5, reduce reactive loss to greatest extent, output on demand is meritorious, has the power savings of highly significant.

Description of drawings

Fig. 1 is the utility model theory diagram;

Fig. 2 is the utility model circuit theory diagrams;

Fig. 3 is the another kind of example structure schematic diagram of the utility model.

Embodiment

Below in conjunction with accompanying drawing 1,2,3 a kind of embodiment of the present utility model is described.

Energy saver away from power-supply device starts is made of rectification control unit 1 and inversion unit 2, and the input of rectification control unit 1 is connected with the electrical network three phase mains, and the input of its output and inversion unit 2 joins; The output of inversion unit 2 directly connects the input of phase asynchronous alternating current motor; Rectification control unit 1 is opened ZK1 by the input of rectifier bridge battle array 3 through sky and is linked to each other with electrical network three phase mains R, S, T, the cathode output end of described rectifier bridge battle array 3 connects the positive pole of filter capacitor I 4 through the normally opened contact of A.C. contactor KM, the cathode output end of described rectifier bridge battle array 3 directly connects the negative pole of filter capacitor I 4, and the normally opened contact of A.C. contactor KM also meets charging resistor R1; 4 liang of termination lead-out terminals of filter capacitor I P, N; The input of Switching Power Supply and rectification control 5 is connected to filter capacitor I 4 two ends, the coil of the output relay termination K of Switching Power Supply and rectification control 5; The coil of A.C. contactor KM is connected with input side R, S through the normally opened contact of relay K; Positive-negative input end of inversion unit 2 joins through the empty positive-negative output end of opening ZK2 and rectification control unit 1; Electrode input end of inversion unit 2 joins through D.C. contactor KM1 normally opened contact and filter capacitor II 6 positive poles, the negative input of inversion unit 2 directly and filter capacitor II 6 negative poles join; The normally opened contact of D.C. contactor KM1 also meets charging resistor R2; The input of 6 liang of termination inverter bridge of filter capacitor II battle array 7 and Switching Power Supply and timing controlled 8, the output termination lead-out terminal U of inverter bridge battle array 7, V, W, lead-out terminal U, V, W directly connect the motor input; The coil of the output relay termination K1 of Switching Power Supply and timing controlled 8; The coil of D.C. contactor KM1 joins through normally opened contact and power supply V1, the V1+ of relay K 1, as the control loop of D.C. contactor KM1; MCU and system's control 9 are single-chip minimum system, and its power supply input connects Switching Power Supply and timing controlled 8, and the control output of MCU and system's control 9 connects PWM and drive controlling 10; The output termination inverter bridge battle array 7 of PWM and drive controlling 10.

The input of above-mentioned rectification control unit 1 also can and connect the output of input reactance device 11, and the input termination sky of input reactance device 11 is opened the output of ZK1.When voltage ripple of power network is big, harmonic content is high or peripheral when the powerful device start and stop are arranged more, power supply can grow big surge, introduces strong electromagnetic, causes rectification control unit 1 to damage or causes inversion unit 2 disorder of working.At this moment, increase input reactance device 11 filtering and inhibition supply harmonic, surge significantly, thereby guarantee the follow-up equipment work safety.

The outlet side of above-mentioned D.C. contactor KM1 can be connected in series direct current reactor 12, it is the electrode input end of the output side joint direct current reactor 12 of D.C. contactor KM1 normally opened contact, the negative input of rectification control unit 1 connects the negative input of direct current reactor 12, and the positive-negative output end of direct current reactor 12 connects the both positive and negative polarity of filter capacitor II 6 respectively.The purpose that installs direct current reactor 12 additional mainly is for the Harmonic Interference on the filtering dc bus, reduces the impact of voltage surge to inversion unit 2, especially when load change is big, can fully ensure inversion unit 2 reliably workings.

The input of above-mentioned inversion unit 2 can and connect the input of brake unit 13, the output termination brake resistance R3 of brake unit 13.Brake unit 13 is mainly used in the bigger occasion of load inertia as system's optional accessory, and its brake resistance R3 determines according to plant capacity and actual loading situation for low sense or noninductive resistance, its power and resistance size.

This device is made up of rectification control unit 1, inversion unit 2, three-phase 380AVC is by R, S, T input, after the sky that closes is opened ZK1, rectifier bridge battle array 3 is started working, and give the filter capacitor I 4 chargings through R1, and when 4 chargings of filter capacitor I reach rated voltage 80% left and right sides, A.C. contactor KM closure, with the R1 bypass, directly to 4 chargings of filter capacitor I.The purpose of doing like this is that charging current is excessive and damage filter capacitor I 4 and rectifier bridge battle array 3 when avoiding filter capacitor I 4 hollows.K is an auxiliary relay, control KM coil; Direct current output PN can carry at a distance, opens ZK2 through sky and inserts inversion unit 2, and inversion unit 2 is actually a frequency converter, and after ZK2 closed, direct current P gave the filter capacitor II 6 chargings through R2 earlier, and after some seconds, D.C. contactor KM1 closure is with the R2 bypass.K1 is an auxiliary relay, control KM1 coil.The KM1 coil voltage is generally 110VDC, and therefore, switch power supply system herein is divided into two parts, and one is inversion control and the used control power supply of output, mainly comprise 24V, ± 15V, 12V, 5V etc.; Another is used for D.C. contactor control, mainly comprises 24V, 110V etc.; Inverting output terminal U, V, W connect alternating current machine, can realize functions such as steady soft start and stepless speed regulation, and can realize rotating switching, crawl, multistage speed control system etc. easily; For motor load, has obvious energy saving effect.

Claims

1. the energy saver that starts away from power-supply device is characterized in that the input of rectification control unit (1) is connected with the electrical network three phase mains, and the input of its output and inversion unit (2) joins; The output of inversion unit (2) directly connects the input of phase asynchronous alternating current motor.

2. the energy saver away from the power-supply device startup according to claim 1, it is characterized in that: described rectification control unit (1) is opened ZK1 by the input of rectifier bridge battle array (3) through sky and is linked to each other with electrical network three phase mains R, S, T, the cathode output end of described rectifier bridge battle array (3) connects the positive pole of filter capacitor I (4) through the normally opened contact of A.C. contactor KM, the cathode output end of rectifier bridge battle array (3) connects the negative pole of filter capacitor I (4), and the normally opened contact of A.C. contactor KM also meets charging resistor R1; Filter capacitor I (4) two termination lead-out terminal P, N; The input of Switching Power Supply and rectification control (5) is connected to filter capacitor I (4) two ends, the coil of the output relay termination K of Switching Power Supply and rectification control (5); The coil of A.C. contactor KM is connected with input side R, S through the normally opened contact of relay K.

3. the energy saver that starts away from power-supply device according to claim 1 is characterized in that: positive-negative input end of described inversion unit (2) is opened ZK2 through sky and is joined with the positive-negative output end of rectification control unit (1) respectively; Electrode input end of inversion unit (2) joins through the normally opened contact of D.C. contactor KM1 and the positive pole of filter capacitor II (6), the positive pole that the negative pole of inversion unit (2) is gone into terminal and filter capacitor II (6) joins, and the normally opened contact of D.C. contactor KM1 also meets charging resistor R2; The input of filter capacitor II (6) two termination inverter bridge battle arrays (7) and Switching Power Supply and timing controlled (8), the output termination lead-out terminal U of inverter bridge battle array (7), V, W, lead-out terminal U, V, W directly connect the motor input; The coil of the output relay termination K1 of Switching Power Supply and timing controlled (8); The coil of D.C. contactor KM1 joins through normally opened contact and power supply V1, the V1+ of relay K 1, as the control loop of D.C. contactor KM1; MCU and system's control (9) are single-chip minimum system, and its power supply input connects Switching Power Supply and timing controlled (8), and the control output of MCU and system's control (9) connects PWM and drive controlling (10); The output termination inverter bridge battle array (7) of PWM and drive controlling (10).

4. according to claim 1,2 or 3 described energy savers away from the power-supply device startup, it is characterized in that: the output of the input termination input reactance device (11) of described rectification control unit (1), the input termination sky of input reactance device (11) is opened the output of ZK1.

5. according to claim 1,2 or 3 described energy savers away from the power-supply device startup, it is characterized in that: the electrode input end of the output side joint direct current reactor (12) of described D.C. contactor KM1 normally opened contact, the negative input of rectification control unit (1) connects the negative input of direct current reactor (12), and the positive-negative output end of direct current reactor (12) connects the both positive and negative polarity of filter capacitor II (6) respectively.

6. according to claim 1, the 2 or 3 described energy savers that start away from power-supply device, it is characterized in that: the input of described inversion unit (2) also connects the input of brake unit (13), the output termination brake resistance R3 of brake unit (13).