CN100483884C - High power motor over-voltage protection device - Google Patents
High power motor over-voltage protection device Download PDFInfo
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- CN100483884C CN100483884C CNB2006100128509A CN200610012850A CN100483884C CN 100483884 C CN100483884 C CN 100483884C CN B2006100128509 A CNB2006100128509 A CN B2006100128509A CN 200610012850 A CN200610012850 A CN 200610012850A CN 100483884 C CN100483884 C CN 100483884C
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Abstract
The related over-voltage protector for high-power motor comprises: three ZnO arresters with cathode paralleled together and connected to ground terminal and anode connected to three-phase terminal, three groups of R-C devices with two ends connected to ground terminal and arrester another end respectively. This invention can reduce damage rate of high-power motor and transformer to 2%.
Description
Technical field
The present invention relates to a kind of high power motor over-voltage protection device.
Background technology
The particularly development of iron and steel enterprise of development along with metallurgical industry, the power of air compressor and electric furnace is increasing, corresponding motor is increasing with the capacity of the transformer of powering to arc furnace, generally reach more than the 6000kVA, the motor work of air compressor is frequently interrupted, reach 18-36 times to the outage of operating a switch of zero load in the transformer of arc furnace power supply one day, the motor of air compressor, connect by vacuum switch with vacuum switch to the transformer of arc furnace power supply and to power, vacuum switch cuts off no-load current and is easy to produce the current-carrying overvoltage, accumulation all the year round, in the operating process voltage influence motor, the insulating properties of transformer, cause motor, arc furnace transformer damages, had 6 arc furnace transformers in 1987 as the applicant, because voltage overvoltage arc furnace transformer damages 20 times, wherein winding and porcelain vase damage 11 times, the overvoltage spoilage reaches 55%, because voltage overvoltage, the cable that connects between transformer and the arc furnace is also repeatedly blasted, and the motor of air compressor is also because the voltage overvoltage is damaged 8.In order to prevent that vacuum switch from cutting off no-load current and producing the current-carrying overvoltage; zinc oxide arrester in parallel is as arc furnace voltage overvoltage protection between three-phase vacuum switch and transformer; zinc oxide arrester is a kind of non-linear element; its resistance is very big under the normal voltage; but when overvoltage takes place; the resistance value that presents is very little; though when vacuum switch cuts off no-load current generation overvoltage, electric current is released from ground; electrical network is released energy over the ground protect vacuum switch and motor; transformer is avoided the overvoltage infringement; but because the frequent folding of vacuum switch; before repacking; the frequent break-make of zinc oxide arrester; a 4000kW arc furnace power supply unit; 1 year break-make of zinc oxide arrester 20 times; the very fast fatigue damage of zinc oxide arrester loses the protective effect to vacuum switch and motor and transformer, and the spoilage of motor and transformer reaches 50%.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing heavy-duty motor voltage overvoltage protection, the invention provides a kind of high power motor over-voltage protection device of reliable operation.
This high power motor over-voltage protection device comprises three zinc oxide arresters; the negative pole of three zinc oxide arresters is connected in parallel; connect with earth terminal; the positive pole of three zinc oxide arresters connects with the binding post that is used for connecting with three-phase electricity respectively; it is characterized in that: R-C capacitance-resistance device that three groups of resistors and capacitors in series also are being set; one end of three R-C capacitance-resistance devices connects with earth terminal; the other end is connecting a fuse respectively; the other end of three fuses connects with the binding post that is used for connecting with three-phase electricity respectively, also can connect with the positive pole of three zinc oxide arresters.During use, this high power motor over-voltage protection device earth terminal ground connection, three terminals that are used for connecting with three-phase electricity connect three ties of vacuum switch and motor or transformer respectively.
Three R of this high power motor over-voltage protection device-resistance value of C capacitance-resistance device is different and different with the rated voltage of the capacitance of capacitor and input, and the relation of the technical parameter of resistor and capacitor and the rated voltage of input sees Table 1:
Table 1
| Rated voltage KV | Rated capacitance μ F ± 10% | Rated value of resistance Ω ± 10% | 1min power-frequency withstand voltage KV is alternate to be reached over the ground | 1.1Un/√3 | Tanδ％ |
| 7.2 | 0.10 | 100 | 30 | ≦10pc | ≦0.04 |
| 12 | 0.10 | 100 | 42 | ≦10pc | ≦0.04 |
| 40.5 | 0.05 | 100 | 95 | ≦10pc | ≦0.04 |
| Model TYPE | System's rated voltage (effective value) kV | Lightning arrester rated voltage (effective value) kV | Continuous operating voltage (effective value) kV | Direct current 1mA reference voltage kV is not less than | Nominal discharge current kV | Residual voltage (peak value) 1/5us≤A is impacted on the abrupt slope | 2ms square wave discharge capacity is not less than A |
| HY5WZ-17/45 | 10 | 17 | 13.6 | 24 | 5 | 51.8 | 150 |
| HY5WZ-10/27 | 6 | 10 | 8 | 14.4 | 5 | 31 | 150 |
| HY5W-51/134 | 35 | 51 | 40.8 | 73.0 | 5 | 154 | 400 |
Table 2
The relation of the technical parameter of lightning arrester and the rated voltage of input sees Table 2.
The present invention is according to R-C capacitance-resistance principle of absorption (utilize the AC impedance of electric capacity connect with resistance dividing potential drop obtain required voltage), utilize the resistance value of electrical network parameter (impedance, electric current, voltage) choose reasonable resistor R and the capacitance of capacitor C, and calculate the motor of air compressor, the overvoltage multiple value of furnace transformer, result of calculation is 1.66 times overvoltage, to the electric equipment of insulation joint voltage 1.732 considerations, within its insulation tolerance range.R-C capacitance-resistance absorption plant and zinc oxide arrester all shield to motor and transformer, but both operation principle differences, R-C resistance-capacitance protection is to change circuit parameter (mainly being impedance) to suppress overvoltage or destroy the superpotential condition that produces.Zinc oxide arrester is a kind of non-linear element, and its resistance value is very big under the normal voltage situation, but when overvoltage took place, the resistance value that presents was little, electrical network is released energy over the ground protect electric equipment to keep away damaged by overvoltage.The present invention selects suitable R-C capacitance-resistance device parameter; just can prevent overvoltage effectively; zinc oxide arrester just can frequent movement; with the power supply unit after the repacking; high power motor and transformer are reduced to 2% because of superpotential spoilage; R-C capacitance-resistance device and zinc oxide arrester cooperatively interact, and protect motor, transformer effectively.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is and the corresponding entity front view of Fig. 1.-
Fig. 3 is and the corresponding left view of Fig. 2.
Fig. 4 is the circuit diagram of high power motor over-voltage protection device of the present invention and air switch and arc furnace transformer.
Fig. 5 is and the corresponding sterogram of Fig. 4.
Fig. 6 is high power motor over-voltage protection device of the present invention and air switch and motor circuit figure.
Fig. 7 is and the corresponding sterogram of Fig. 6.
Among the above-mentioned figure:
1, lead 2, lead 3, mounting panel 4, mounting panel 5, lead
6, frame base 7, lead 8, lead 9, lead
10, high power motor over-voltage protection device 11, lead 12, lead 13, lead
X1, X2, X3, XF1, XF2, XF3, XFR1, XFR2, XFR3, XF binding post
XQ3, XT3 binding post FU1, FU2, FU3 fuse
R1, R2, the public ground wire C1 of R3 resistor E, C2, C3 capacitor F1,
F2, F3 zinc oxide arrester Q1 air switch T three-phase transformer M motor
Embodiment
Describe the embodiment of this high power motor over-voltage protection device in detail below in conjunction with embodiment and accompanying drawing thereof, but the embodiment of this high power motor over-voltage protection device is not limited to following embodiment.
Embodiment one
Fig. 1; the high power motor over-voltage protection device that Fig. 2 and Fig. 3 describe has zinc oxide arrester F1; zinc oxide arrester F2 and zinc oxide arrester F3; the negative pole of three zinc oxide arresters is connected with the binding post XE that is used for ground connection; zinc oxide arrester F1; zinc oxide arrester F2; the positive pole of zinc oxide arrester F3 with lead such as lead 9 respectively with binding post X1; binding post X2; binding post X3 connects; it is characterized in that: the R-C capacitance-resistance device with corresponding three groups of resistors of three-phase electricity and capacitors in series also is being set; with R3-C3 capacitance-resistance device is the connection of example explanation R-C capacitance-resistance device; the negative pole of capacitor C3 connects with binding post XE; the positive pole of capacitor C3 connects with an end of resistor R 3; the other end of resistor R 3 connects with the end of fuse FU3 through binding post XFR3, and the other end of fuse FU3 connects with binding post X3 through binding post XF3.
The power supply rated voltage of present embodiment is 7.2KV, the rated capacitance of capacitor C1, capacitor C2 and capacitor C3 is 0.10 μ F ± 10%, resistor R 1, resistor R 2 are 100 Ω ± 10% with the rated value of resistance of resistor R 3, and the technical parameter of zinc oxide arrester F1, zinc oxide arrester F2, zinc oxide arrester F3 is the third line (system's rated voltage is 6KV) in the table 2.
Present embodiment is the configuration device for high-power electric arc furnace supply transformer T; see Fig. 4 and Fig. 5 with connecting of transformer T and air switch Q1; the binding post X1 of high power motor over-voltage protection device 10, binding post X2, binding post X3 connect with three output wiring terminals of air switch respectively; connect with the output wiring terminal XQ3 of air switch Q1 as binding post X3; and binding post X1, binding post X2, binding post X3 connect with three input wires terminals of transformer T respectively, connect with the input wires terminal XT3 of transformer T as binding post X3.The quota capacity of air switch is 800--2000A, and the rated capacity of transformer T is 3000--6000KVA.
The configuration device that also can be used as high power motor of present embodiment; see Fig. 6 and Fig. 7 with connecting of motor M and air switch Q1; the binding post X1 of high power motor over-voltage protection device 10, binding post X2, binding post X3 connect with three output wiring terminals of air switch respectively; output wiring terminal XQ3 as binding post X3 and air switch Q1; and binding post X1, binding post X2, binding post X3 connect with three input wires terminals of motor M respectively, connect with the input of motor M as binding post X3.The quota capacity of air switch is 800--2000A, and the rated capacity of motor M is 2000--5000KW.
Embodiment two
The circuit diagram of present embodiment is seen Fig. 1, Fig. 2 with the sterogram that connects of corresponding electric elements, the power supply rated voltage of present embodiment is 12KV, the rated capacitance of capacitor C1, capacitor C2 and capacitor C3 is 0.10 μ F ± 10%, resistor R 1, resistor R 2 are 100 Ω ± 10% with the rated value of resistance of resistor R 3, and the technical parameter of zinc oxide arrester F1, zinc oxide arrester F2, zinc oxide arrester F3 is the row of second in the table 2 (system's rated voltage is 10KV).
Present embodiment can be used as the configuration device of high-power electric arc furnace supply transformer, sees Fig. 4 and Fig. 5 with connecting of transformer T and air switch Q1, and the quota capacity of air switch is 800-1250A, and the rated capacity of transformer T is 5500-6000KVA.
Present embodiment also can be used as the configuration device of high power motor, sees Fig. 6 and Fig. 7 with connecting of motor M and air switch Q1, and the quota capacity of air switch is 800-1250A, and the rated capacity of motor M is 3000-5000KW.
Embodiment three
The circuit diagram of present embodiment is seen Fig. 1, Fig. 2 with the sterogram that connects of corresponding electric elements, the power supply rated voltage of present embodiment is that the rated capacitance of 40.5KV capacitor C1, capacitor C2 and capacitor C3 is 0.05 μ F ± 10%, resistor R 1, resistor R 2 are 100 Ω ± 10% with the rated value of resistance of resistor R 3, and the technical parameter of zinc oxide arrester F1, zinc oxide arrester F2, zinc oxide arrester F3 is the fourth line (system's rated voltage is 35KV) in the table 2.
Present embodiment can be used as the configuration device of high-power electric arc furnace supply transformer, sees Fig. 4 and Fig. 5 with connecting of transformer T and air switch Q1, and the quota capacity of air switch is 1000-4000A, and the rated capacity of transformer T is 40-150MVA.Present embodiment also can be used as the configuration device of high power motor, sees Fig. 6 and Fig. 7 with connecting of motor M and air switch Q1, and the quota capacity of air switch is 300-800A, and the rated capacity of motor M is 3000-5000KW.
Other parameter of above-mentioned three embodiment is referring to table 1.
Claims (1)
1, a kind of high power motor over-voltage protection device, it comprises three zinc oxide arresters, the negative pole of three zinc oxide arresters is connected in parallel, and connect with earth terminal, the positive pole of three zinc oxide arresters connects with the binding post that is used for connecting with three-phase electricity respectively, it is characterized in that: R-C capacitance-resistance device that three groups of resistors and capacitors in series also are being set, one end of three R-C capacitance-resistance devices connects with earth terminal, the other end is connecting a fuse respectively, and the other end of three fuses connects with the binding post that is used for connecting with three-phase electricity respectively; During use, with earth terminal ground connection, three terminals that are used for connecting with three-phase electricity connect three ties of vacuum switch and motor or transformer respectively; The pass of the rated voltage of three R-resistance values of C capacitance-resistance device and the capacitance of capacitor and input is when rated voltage is 7.2KV or 12KV, and the rated capacitance of capacitor is 0.10 μ F ± 10%, and the rated value of resistance of resistor is 100 Ω ± 10%; When rated voltage was 40.5KV, the rated capacitance of capacitor was 0.05 μ F ± 10%, and the rated value of resistance of resistor is 100 Ω ± 10%.
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| CNB2006100128509A CN100483884C (en) | 2006-06-16 | 2006-06-16 | High power motor over-voltage protection device |
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| CNB2006100128509A CN100483884C (en) | 2006-06-16 | 2006-06-16 | High power motor over-voltage protection device |
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| CN100483884C true CN100483884C (en) | 2009-04-29 |
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Owner name: SHANXI TAIGANG STAINLESS STEEL CO., LTD. Free format text: FORMER OWNER: TAIYUAN IRON AND STEEL (GROUP) CO LTD Effective date: 20070629 |
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Effective date of registration: 20070629 Address after: 030003 No. 2 lawn street, Taiyuan, Shanxi Applicant after: Shanxi Taigang Stainless Steel Co., Ltd. Address before: 030003 No. 2, sharp lawn, Taiyuan City, Shanxi Province Applicant before: Taiyuan Iron & Steel (Group) Co., Ltd. |
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