CN102223081B - Method for charging high-capacity voltage type frequency converter - Google Patents

Method for charging high-capacity voltage type frequency converter Download PDF

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Publication number
CN102223081B
CN102223081B CN2011101594959A CN201110159495A CN102223081B CN 102223081 B CN102223081 B CN 102223081B CN 2011101594959 A CN2011101594959 A CN 2011101594959A CN 201110159495 A CN201110159495 A CN 201110159495A CN 102223081 B CN102223081 B CN 102223081B
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China
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resistor
contactor
frequency converter
charging
button
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CN2011101594959A
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Chinese (zh)
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CN102223081A (en
Inventor
石磊
韩向东
乔聪明
陈戈
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山西太钢不锈钢股份有限公司
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Abstract

The invention relates to a method for charging a high-capacity voltage type frequency converter, which is characterized by charging the frequency converter through two stages of current-limiting circuits (4), which mainly comprises three sets of series resistors. The charging method comprises the following steps: firstly, the output ends of the current-limiting circuits (4) are connected with the input end of the voltage type frequency converter through two-stage current-limiting charging; the input ends of the current-limiting circuits (4) are connected with three-phase alternating current 380V; each phase of 380V is used for charging three input ends of the voltage type frequency converter through two series resistors; a rectification circuit is used for pre-charging an electrolytic capacitor (C1) through a pre-charged resistor (R1); and secondarily, a main contact of a first-stage current-limiting charging contactor (KM3) is used for connecting the other end of the resistor connected with a main contact of a contactor (KM3) to the three input ends of the frequency converter; each phase of 380V is used for charging the three input ends of the voltage type frequency converter through a resistor; and a rectification part (1) of the frequency converter is used for outputting positive voltage and directly pre-charging the electrolytic capacitor (C1). When the high-capacity voltage type frequency converter is charged by using the method, electronic elements can be prevented from being damaged.

Description

A kind of charging method of large capacity voltage frequency converter
Technical field
The present invention relates to a kind of charging method of large capacity voltage frequency converter, is specifically to deposit more than 1 year at the voltage frequency converter that capacity is 45KW-250KW, gives the charging method of large capacity voltage frequency converter.
Background technology
Along with the large-scale application of voltage frequency converter in factory, replacing after voltage frequency converter damages and the task of maintenance roll up, because the spare part of voltage frequency converter has generally all been deposited more than at least one year at storehouse, must charge to voltage frequency converter, existing charging modes is direct charging, the possibility that easily causes the intermediate circuit electrolytic capacitor to damage, even may blast, serious impact is normally produced.
Summary of the invention
In order to overcome the directly above-mentioned deficiency of charging of existing large capacity voltage frequency converter, while the invention provides a kind of the charging, avoid the charging method of the large capacity voltage frequency converter of electronic component damage.
The charging method of this large capacity voltage frequency converter is to charge with the two-stage choked flow circuit that three groups of resistors in seriess are main formation.the choked flow circuit is by six resistors, contactor KM3, contactor KM2, air switch Q2, start button S1, stop button S2, start button S3, stop button S4 and connecting line form, the main contact of contactor KM2 has three binding posts for connecting with external 380V power supply, first terminals of other three binding posts are connecting resistor R2, second binding post connecting resistor R3, the 3rd binding post connecting resistor R4, the other end of resistor R2 is connecting resistor R5, the other end of resistor R5 is connected with first output of choked flow circuit, the other end of resistor R3 is connecting resistor R6, the other end of resistor R6 is connected with second output of choked flow circuit, the other end of resistor R4 is connecting resistor R7, the other end of resistor R7 is connected with the 3rd output of choked flow circuit.Two binding posts of the first-phase of the main contact of relay K M3 are connected in parallel on the two ends of resistor R5, two binding posts of the second-phase of the main contact of relay K 3 are connected in parallel on the two ends of resistor R6, and two binding posts of the third phase of the main contact of relay K 3 are connected in parallel on the two ends of resistor R7.
In the main contact of contactor KM2 and three binding posts that external 380V power supply connects, have two binding posts respectively with two input terminal sub-connections of air switch Q2.Start button S1 and two output wiring terminals that are connected to air switch Q2 after the pull-in winding three of stop button S2 and contactor KM2 connects successively, the auxiliary contact of contactor KM2 is connected in parallel on the two ends of start button S1, forms the control loop of contactor KM2.Start button S3 and two output wiring terminals that are connected to air switch Q2 after the pull-in winding three of stop button S4 and contactor KM3 connects successively, the auxiliary contact of contactor K3 is connected in parallel on the two ends of start button S3, forms the control loop of contactor KM3.
Wherein R2, R3 equate with the resistance value of R4, and R5, R6 equate with the resistance value of R7, and the resistance value of R5 is 10 times of R2.
R2, R3 in above-mentioned choked flow circuit and the resistance value of R4 all are set to 1 ohm, and the resistance value of R5, R6 and R7 all is arranged to 10 ohm of the bests.
The charging method of this large capacity (capacity is 45KW--250KW's) voltage frequency converter comprises following step successively:
One, through two level current limiting, charge
by three inputs of the three-phase bridge rectifier circuit of the rectifying part of three outputs of choked flow circuit and voltage frequency converter such as R, S is connected with T, the binding post of three inputs of conduct of choked flow circuit is connected with three-phase alternating current 380V power supply, by air switch Q2, two-phase 380V is connected logical with two control loops of contactor KM2 and contactor KM3, press start button S1, the main contact of the pull-in winding energising contactor KM2 of contactor KM2 is by resistor R2 and the R5 of three-phase alternating current 380V power supply and three-phase series, R3 is connected logical with R6 and R4 with R7, simultaneously, the auxiliary contact of contactor KM2 connects the two ends of start button S1 logical, contactor KM3 is in off-state, each is defeated by three inputs such as the R of the rectifying part of voltage frequency converter three-phase alternating current 380V power supply after resistance (as R2 and R5) the current limliting step-down of two series connection, S and T charge, at this moment the resistor R1 by precharge carries out precharge to the electrolysis electrolytic capacitor C1 of middle DC link as the three-phase bridge rectifier circuit of rectifying part, the contactor KM1 in parallel with the resistor R1 of precharge can not adhesive, for off-state, the resistor R1 of precharge has continued metering function, 1 couple of electrolytic capacitor C1 of resistance R by precharge carries out precharge, charging interval is not less than 4 hours.
Two, through the one-level current-limiting charge
press start button S3, the pull-in winding energising of contactor KM3, the electricity group device R2 that the main contact of contactor KM3 will be connected with the main contact of contactor KM2, three inputs of the three-phase bridge rectifier circuit of the other end of R3 and R4 and the rectifying part of voltage frequency converter such as R, S is connected logical with T, simultaneously, the auxiliary contact of contactor KM3 connects the two ends of start button S3 logical, each is defeated by three inputs such as the R of the rectifying part of voltage frequency converter three-phase alternating current 380V power supply through a resistor such as resistor R2, S and T charge, because input voltage is higher, charging current is large, when charging voltage reaches 500V ± 25V, contactor KM1 adhesive, the three-phase bridge rectifier circuit output positive voltage of the rectifying part of voltage frequency converter directly carries out precharge to electrolytic capacitor C1, charging interval is not less than 4 hours.
Press stop button S2 and S4, the main contact of contactor KM2 and KM3 disconnects, and cuts off three-phase alternating current 380V power supply, three inputs of the output of choked flow circuit and voltage frequency converter such as R, S is taken apart to the end of charging with T.
The charging method of this large capacity voltage frequency converter, charge to voltage frequency converter with two kinds of different voltages from low to high, avoids excessive because of charging current, causes the capacitor charging instantaneous short circuit to cause explosion, the damage that voltage frequency converter is caused.
The accompanying drawing explanation
Fig. 1 is the circuit diagram of this charging method choked flow circuit.
Fig. 2 is charge step one schematic diagram of the main circuit diagram of the large capacity voltage frequency converter of Siemens.
Fig. 3 is charge step two schematic diagrames of the main circuit diagram of the large capacity voltage frequency converter of Siemens.
Fig. 4 is charge step one schematic diagram of the main circuit diagram of the large capacity voltage frequency converter of Japan.
Fig. 5 is charge step two schematic diagrames of the main circuit diagram of the large capacity voltage frequency converter of Japan.In above-mentioned Fig. 1-Fig. 3:
1-rectifying part 2-intermediate dc link 3-Converting Unit 4-choked flow circuit
C1 electrolytic capacitor R1 resistor R2 resistor R3 resistor
R4 resistor R5 resistor R6 resistor R7 resistor
R2, R3 equate with the resistance value of R4, and R5, R6 equate with the resistance value of R7, equal 10R2
Q2 air switch S1 start button S2 stop button S3 start button
S4 stop button KM1 contactor KM2 contactor KM3 contactor
VD1---VD6 thyristor IGBT1---IGBT6 forms 6 IGBT modules of Converting Unit
In above-mentioned Fig. 4 and Fig. 5:
5-rectifying part 6-intermediate dc link 7-Converting Unit C2 electrolytic capacitor
R8 resistor KM4 contactor
VD7---VD12 thyristor IGBT7---IGBT12 forms 6 IGBT modules of Converting Unit
Embodiment
Below in conjunction with implementing and accompanying drawing detailed description the specific embodiment of the present invention, but the specific embodiment of the present invention is not limited to following embodiment.
The choked flow circuit 4 that the present embodiment is used first is described.the choked flow circuit 4 that Fig. 1 describes is by six resistors, contactor KM3, contactor KM2, air switch Q2, start button S1, stop button S2, start button S3, stop button S4 and connecting line form, the main contact of contactor KM2 has three binding posts for connecting with external 380V power supply, first terminals of other three binding posts are connecting resistor R2, second binding post connecting resistor R3, the 3rd binding post connecting resistor R4, the other end of resistor R2 is connecting resistor R5, the other end of resistor R5 is connected with first output of choked flow circuit, the other end of resistor R3 is connecting resistor R6, the other end of resistor R6 is connected with second output of choked flow circuit, the other end of resistor R4 is connecting resistor R7, the other end of resistor R7 is connected with the 3rd output of choked flow circuit.Two binding posts of the first-phase of the main contact of relay K M3 are connected in parallel on the two ends of resistor R5, two binding posts of the second-phase of the main contact of relay K 3 are connected in parallel on the two ends of resistor R6, and two binding posts of the third phase of the main contact of relay K 3 are connected in parallel on the two ends of resistor R7.
In the main contact of contactor KM2 and three binding posts that external 380V power supply connects, have two binding posts respectively with two input terminal sub-connections of air switch Q2.Start button S1 and two output wiring terminals that are connected to air switch Q2 after the pull-in winding three of stop button S2 and contactor KM2 connects successively, the auxiliary contact of contactor KM2 is connected in parallel on the two ends of start button S1, forms the control loop of contactor KM2.Start button S3 and two output wiring terminals that are connected to air switch Q2 after the pull-in winding three of stop button S4 and contactor KM3 connects successively, the auxiliary contact of contactor K3 is connected in parallel on the two ends of start button S3, forms the control loop of contactor KM3.The resistance value of R2, R3 and R4 is all 1 ohm, and the resistance value of R5, R6 and R7 is all 10 ohm.
Embodiment mono-
The present embodiment is applicable to the voltage frequency converter that capacity is 45-250KW, and the present embodiment is given Siemens's series voltage type frequency converter charging of Siemens 75KW, and model is 6SE7031-5EF60.This voltage frequency converter was placed 2 years at storehouse, and as the voltage frequency converter that Fig. 2 describes, it mainly is comprised of rectifying part 1, intermediate dc link 2 and Converting Unit 3, and relay contact KM1 and resistor R1 are the precharge loop feature.Three-phase bridge rectifier circuit as rectifying part 1 has six thyristor VD1---VD6, and three input U1/L1, V1/L2 and W1/L3 are arranged.Intermediate dc link 2 mainly consists of electrolytic capacitor C1, and Converting Unit 3 is by 6 full-control type power IGBT module I GBT1---IGBT6 forms, and by the PWM pulse-width modulation, realizes frequency control, and three outputs are U2/T1, V2/T2 and W2/T3.
The present embodiment is following step successively:
One, through two level current limiting, charge
three input U1/L1 by the three-phase bridge rectifier circuit of the rectifying part 1 of three outputs of choked flow circuit 4 shown in Figure 1 and voltage frequency converter, V1/L2 is connected with W1/L3, see Fig. 2, the binding post of three inputs of conduct of choked flow circuit 1 is connected with three-phase alternating current 380V power supply, press air switch Q2, two-phase 380V is connected logical with two control loops of contactor KM2 and contactor KM3, press start button S1, the main contact of the pull-in winding energising contactor KM2 of contactor KM2 is by resistor R2 and the R5 of three-phase alternating current 380V power supply and three-phase series, R3 is connected logical with R6 and R4 with R7, simultaneously, the auxiliary contact of contactor KM2 connects the two ends of start button S1 logical, contactor KM3 is in off-state, each is defeated by three input U1/L1 of the rectifying part 1 of voltage frequency converter totally three-phase alternating current 380V power supply after 11 ohm (as R2 and R5) current limliting step-downs of resistance of two series connection, V1/L2 and W1/L3 charge, at this moment the resistor R1 by precharge carries out precharge to the electrolytic capacitor C1 of middle DC link 2 as the three-phase bridge rectifier circuit of rectifying part 1, the contactor KM1 in parallel with the resistor R1 of precharge can not adhesive, for non-attracting state, the resistor R1 of precharge has continued metering function, 1 couple of electrolytic capacitor C1 of resistance R by precharge carries out precharge, charged 4 hours.
Two, through the one-level current-limiting charge
press start button S3, the pull-in winding energising of contactor KM3, the electricity group device R2 that the main contact of contactor KM3 will be connected with the main contact of contactor KM2, three input U1/L1 of the three-phase bridge rectifier circuit of the other end of R3 and R4 and the rectifying part of voltage frequency converter 1, V1/L2 is connected logical with W1/L3, see Fig. 3, simultaneously, the auxiliary contact of contactor KM3 connects the two ends of start button S3 logical, three input U1/L1 of each rectifying part 1 of being defeated by voltage frequency converter through the resistor of 1 ohm such as resistor R2 of three-phase alternating current 380V power supply, V1/L2 and W1/L3 charge, because input voltage is higher, charging current is large, when charging voltage reaches 500V ± 25V, contactor KM1 adhesive, the three-phase bridge rectifier circuit output positive voltage of the rectifying part 1 of voltage frequency converter directly carries out precharge to electrolytic capacitor C1, charged 4 hours.
Press stop button S2 and S4, the main contact of contactor KM2 and KM3 disconnects, and cut-out three-phase alternating current 380V power supply, take three inputs of the output of choked flow circuit 4 and voltage frequency converter apart U1/L1, V1/L2 and W1/L3 takes apart, and charging finishes.
Embodiment bis-
The present embodiment is applicable to capacity for being the voltage frequency converter of 45-250KW, and the present embodiment is given the Some Strains of Fuji column voltage type frequency converter charging of Japanese 90KW, and model is FRN90G11S.This voltage frequency converter was placed 1 year at storehouse, and as the voltage frequency converter that Fig. 4 describes, it mainly is comprised of rectifying part 5, intermediate dc link 6 and Converting Unit 7, and contactor KM4 and resistor R8 are the precharge loop feature.Three-phase bridge rectifier circuit as rectifying part 5 has six thyristor VD7---VD12, and three input R, S, T are arranged.Intermediate dc link 6 mainly consists of electrolysis electrolytic capacitor C2, and Converting Unit 7 is by 6 full-control type power IGBT module I GBT7---IGBT12 forms, and by the PWM pulse-width modulation, realizes frequency control, and output is U, V and W.
The present embodiment is following step successively:
One, through two level current limiting, charge
three input R by the three-phase bridge rectifier circuit of the rectifying part 1 of three outputs of choked flow circuit 4 shown in Figure 1 and voltage frequency converter, S is connected with T, see Fig. 4, the binding post of three inputs of conduct of choked flow circuit 1 is connected with three-phase alternating current 380V power supply, press air switch Q2, two-phase 380V is connected logical with two control loops of contactor KM2 and contactor KM3, press start button S1, the main contact of the pull-in winding energising contactor KM2 of contactor KM2 is by resistor R2 and the R5 of three-phase alternating current 380V power supply and three-phase series, R3 is connected logical with R6 and R4 with R7, simultaneously, the auxiliary contact of contactor KM2 connects the two ends of start button S1 logical, contactor KM3 is in off-state, each is defeated by three input R of the rectifying part 5 of voltage frequency converter totally three-phase alternating current 380V power supply after 11 ohm (as R2 and R5) current limliting step-downs of resistance of two series connection, S and T charge, at this moment the resistor R8 by precharge carries out precharge to the electrolysis electrolytic capacitor C2 of middle DC link 6 as the three-phase bridge rectifier circuit of rectifying part 5, the contactor KM4 in parallel with the resistor R8 of precharge can not adhesive, for off-state, the resistor R8 of precharge has continued metering function, 8 couples of electrolytic capacitor C2 of resistance R by precharge carry out precharge, charged 4 hours.
Two, through the one-level current-limiting charge
press start button S3, the pull-in winding energising of contactor KM3, the electricity group device R2 that the main contact of contactor KM3 will be connected with the main contact of contactor KM2, three input R of the three-phase bridge rectifier circuit of the other end of R3 and R4 and the rectifying part of voltage frequency converter 5, S is connected logical with T, see Fig. 5, simultaneously, the auxiliary contact of contactor KM3 connects the two ends of start button S3 logical, three input R of each rectifying part 5 of being defeated by voltage frequency converter through the resistor of 1 ohm such as resistor R2 of three-phase alternating current 380V power supply, S and T charge, because input voltage is higher, charging current is large, when charging voltage reaches 500V ± 25V, contactor KM4 adhesive, the three-phase bridge rectifier circuit output positive voltage of the rectifying part 5 of voltage frequency converter directly carries out precharge to electrolytic capacitor C2, charged 4 hours.
Press stop button S2 and S4, the main contact of contactor KM2 and KM3 disconnects, and cuts off three-phase alternating current 380V power supply, three input R, S of the output of choked flow circuit 4 and voltage frequency converter is taken apart to the end of charging with T.

Claims (4)

1. the charging method of a large capacity voltage frequency converter, it is with choked flow circuit (4), to capacity, to be the voltage frequency converter charging of 45KW-250KW, choked flow circuit (4) is by six resistors, contactor KM3, contactor KM2, air switch Q2, start button S1, stop button S2, start button S3, stop button S4 and connecting line form, the main contact of contactor KM2 has three binding posts for connecting with external 380V power supply, first terminals of other three binding posts are connecting the end of resistor R2, second binding post connecting the end of resistor R3, the 3rd binding post connecting the end of resistor R4, the other end of resistor R2 is connecting the end of resistor R5, the other end of resistor R5 is connected with first output of choked flow circuit, the other end of resistor R3 is connecting the end of resistor R6, the other end of resistor R6 is connected with second output of choked flow circuit, the other end of resistor R4 is connecting the end of resistor R7, the other end of resistor R7 is connected with the 3rd output of choked flow circuit, two binding posts of the first-phase of the main contact of contactor KM3 are connected in parallel on the two ends of resistor R5, two binding posts of the second-phase of the main contact of contactor KM3 are connected in parallel on the two ends of resistor R6, and two binding posts of the third phase of the main contact of contactor KM3 are connected in parallel on the two ends of resistor R7, in the main contact of contactor KM2 and three binding posts that external 380V power supply connects, have two binding posts respectively with two input terminal sub-connections of air switch Q2, start button S1 and two output wiring terminals that are connected to air switch Q2 after the pull-in winding three of stop button S2 and contactor KM2 connects successively, the auxiliary contact of contactor KM2 is connected in parallel on the two ends of start button S1, forms the control loop of contactor KM2, start button S3 and two output wiring terminals that are connected to air switch Q2 after the pull-in winding three of stop button S4 and contactor KM3 connects successively, the auxiliary contact of contactor KM3 is connected in parallel on the two ends of start button S3, forms the control loop of contactor KM3, wherein resistor R2, resistor R3 equate with the resistance value of resistor R4, and resistor R5, resistor R6 equate with the resistance value of resistor R7, are all 10 times of resistor R2, charging method comprises following step successively:
One, through two level current limiting, charge
By three of the rectifying part (1) of three outputs of choked flow circuit (4) and voltage frequency converter
three inputs of phase bridge rectifier connect, the binding post of three inputs of conduct of choked flow circuit (4) is connected with three-phase alternating current 380V power supply, by air switch Q2, two-phase 380V is connected logical with two control loops of contactor KM2 and contactor KM3, press start button S1, the main contact of contactor KM2 is by resistor R2 and the R5 of three-phase alternating current 380V power supply and three-phase series, R3 is connected logical with R6 and R4 with R7, simultaneously, the auxiliary contact of contactor KM2 connects the two ends of start button S1 logical, contactor KM3 is in off-state, each three inputs of being defeated by the rectifying part (1) of voltage frequency converter after the resistance current limliting step-down of two series connection of three-phase alternating current 380V power supply charge, the contactor KM1 in parallel with the resistor R1 of precharge is off-state, at this moment the resistor R1 by precharge carries out precharge to electrolytic capacitor C1 as the three-phase bridge rectifier circuit of rectifying part, charging interval is not less than 4 hours,
Two, through the one-level current-limiting charge
press start button S3, the resistor R2 that the main contact of contactor KM3 will be connected with contactor KM2 main contact, resistor R3 is connected logical with the other end of resistor R4 with three inputs of the three-phase bridge rectifier circuit of the rectifying part of voltage frequency converter, simultaneously, the auxiliary contact of contactor KM3 connects the two ends of start button S3 logical, each three inputs of being defeated by the rectifying part (1) of voltage frequency converter through a resistor of three-phase alternating current 380V power supply charge, when charging voltage reaches 500V ± 25V, contactor KM1 adhesive, the three-phase bridge rectifier circuit output positive voltage of the rectifying part of voltage frequency converter directly carries out precharge to electrolytic capacitor C1, charging interval is not less than 4 hours.
2. the charging method of large capacity voltage frequency converter according to claim 1 is characterized in that:
The resistance value of resistor R2 in described choked flow circuit (1), resistor R3 and resistor R4 is all 1 ohm, and the resistance value of resistor R5, resistor R6 and resistor R7 is all 10 ohm.
3. the charging method of large capacity voltage frequency converter according to claim 1 and 2, is characterized in that: for the Siemens's series voltage type frequency converter charging to Siemens 75KW.
4. the charging method of large capacity voltage frequency converter according to claim 1 and 2, is characterized in that: for the charging of the Some Strains of Fuji column voltage type frequency converter to Japanese 90KW.
CN2011101594959A 2011-06-09 2011-06-09 Method for charging high-capacity voltage type frequency converter CN102223081B (en)

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CN104767395B (en) * 2015-04-30 2017-05-31 山东航宇吉力电子有限公司 Variable-frequency power sources three-phase and single-phase output circuit
EP3490129B1 (en) * 2017-11-28 2020-01-08 KEB Automation KG Electronic protection circuit
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