CN203951186U - The stube cable of electric power secondary system - Google Patents
The stube cable of electric power secondary system Download PDFInfo
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- CN203951186U CN203951186U CN201420384290.XU CN201420384290U CN203951186U CN 203951186 U CN203951186 U CN 203951186U CN 201420384290 U CN201420384290 U CN 201420384290U CN 203951186 U CN203951186 U CN 203951186U
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Abstract
The stube cable of the open electric power secondary system of the utility model, electric power secondary system comprises the primary equipment that contains power supply unit and the secondary device that contains load equipment, between power supply unit and load equipment, driver module is set, between the input of driver module and earth terminal, be provided with the first lightning protection circuit, between the output of driver module and earth terminal, be provided with the second lightning protection circuit, driver module comprises rectification circuit, filter circuit and inverter circuit, between power supply unit and driver module, between driver module and load equipment, all by stube cable, be connected, this stube cable is shielded type cable, many heart yearns are set in the external protection of this shielded type cable cable, this heart yearn is enclosed with inner protective layer.The utility model at least can fail safe, anti-interference or can be handling etc. some aspect improve the performance of electric power secondary system.
Description
Technical field
The utility model relates to electric equipment, relates in particular to electric power secondary system and auxiliary device thereof.
Background technology
The electric equipment of power plant and electric substation is divided into primary equipment and secondary device.Primary equipment (also claiming main equipment) is the main body that forms electric power system, and it is the equipment of direct production, conveying and distribution electric energy, comprises generator, power transformer, circuit breaker, isolating switch, power bus-bar, power cable and transmission line etc.Secondary device is the equipment that primary equipment is controlled, regulates, protected and monitors, and it comprises controling appliance, relaying protection and automatics, measuring instrument, signal utensil etc.Secondary device is obtained contacting of electricity by voltage transformer summation current transformer and primary equipment.The loop of primary equipment and connection thereof is called primary circuit.The electric loop that secondary device couples together to realize certain specification requirement according to certain rule is called secondary circuit.
In electric power secondary system, load equipment (belongs to secondary device, as motor etc.) by driver module, be connected to and (belong to primary equipment as power supply unit, as civil power) output, alternating current power supply unit being provided by this driver module is converted to the required alternating current of load equipment or direct current, reaches thus the control to load equipment.The upper Shortcomings of existing electric power secondary system design: the one, Lighting Protection Measures is good not, when lightning current is too powerful, may there is fraction lightning current to enter into load equipment, cause thus load equipment to damage under thunder-strike current residual voltage is impacted, this makes security of system poor, has shortened widely its useful life; The 2nd, interference protection measure is not ideal enough, and load equipment easily suffers the interference of the factors such as power supply and external environment condition, and this stable operation on load equipment causes larger impact; The 3rd, it is convenient not to control, and the adjustment underaction that it controls parameter can not meet user's demand well.In view of this, be necessary to relate to new electric power secondary system and auxiliary device thereof, to its performance is improved.
Utility model content
The defect existing for prior art, the purpose of this utility model is to provide electric power secondary system and auxiliary device thereof so that at least can fail safe, anti-interference or can be handling etc. some aspect the performance of electric power secondary system is improved.
For solving above technical problem, the utility model provides a kind of stube cable of electric power secondary system, described electric power secondary system comprises the primary equipment that contains power supply unit and the secondary device that contains load equipment, between described power supply unit and described load equipment, driver module is set, between the input of described driver module and earth terminal, be provided with the first lightning protection circuit, between the output of described driver module and earth terminal, be provided with the second lightning protection circuit, described driver module comprises for alternating current being converted to galvanic rectification circuit, for realizing the filter circuit of galvanic filtering and energy storage effect and realizing the inverter circuit of frequency modulation and voltage modulation to alternating current conversion for completing direct current, the stube cable of described electric power secondary system is configured to: between described power supply unit and described driver module, between described driver module and described load equipment, all by shielded type cable, be connected, described shielded type cable passes through earth element ground connection near one end cable shield of power supply unit, described shielded type cable is near the direct ground connection of other end cable shield of described load equipment.
Compared with prior art, the utility model can improve the performance of electric power secondary system effectively, and it at least can obtain the advantage of following some aspects:
1, fail safe improves.Be provided with secondary lightning protection, most of thunder-strike current is wherein released by the first order earth element of driver module input; And driver module output arranges second level earth element, the residual voltage that makes to enter load is less, is conducive to prevent that load is struck by lightning, and improves its safety in utilization, extends its useful life.
2, strong interference immunity.Be mainly manifested in several aspects:
(1) shielded type cable passes through earth element ground connection by one end cable shield of power supply unit, shielded type cable is by the direct ground connection of other end cable shield of load equipment, it has kept the good anti-jamming effectiveness of 2 ground connection of tradition, also limited the size of earth-current or interference simultaneously, can avoid earth-current or disturb the danger of burning shield layer of shielded cable when excessive.
(2) heart yearn of shielded type cable has all designed heart yearn screen, is conducive to the electromagnetic radiation, electrostatic coupling and the electromagnetic induction that suppress to produce between heart yearn; Also designed cable shield, be conducive to the electromagnetic interference that suppresses outside simultaneously; This two aspects factor, has eliminated the interference that electric power secondary system shielded type cable produces preferably, is conducive to guarantee the accuracy of data.
(3) the elementary filtering decoupling circuit that is provided with of driver module, it is as the preposition simulation low-pass filter of AC signal input channel, have jamproof effect concurrently, can suppress to come the differential mode interference of Self Powered Device, the accuracy of proof load device data transmission.
3, can be handling better.By microcontroller circuit, control the output mode of driver module, be conducive to neatly by pre-provisioning request output voltage, thereby meet the demand of different user.For electric machinery load equipment, can, according to the setting signal of man-machine interface circuit, to motor, carry out stepless frequency conversion control.
Accompanying drawing explanation
By reading below detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing is only for the object of preferred implementation is shown, and do not think restriction of the present utility model.And in whole accompanying drawing, by identical reference symbol, represent identical parts.In the accompanying drawings:
Fig. 1 is the composition frame chart of the utility model embodiment electric power secondary system;
Fig. 2 is the earthing mode of shielded type cable in Fig. 1;
Fig. 3 is the structure chart of shielded type cable in Fig. 1;
Fig. 4 is the composition frame chart of driver module in Fig. 1;
Fig. 5 is the example of partial circuit in driver module shown in Fig. 4.
Embodiment
A lot of details have been set forth in the following description so that fully understand the utility model.But the utility model can be implemented to be much different from alternate manner described here, those skilled in the art can do similar popularization without prejudice to the utility model intension in the situation that, so the utility model is not subject to the restriction of following public specific embodiment.
Referring to Fig. 1, represent the preferred embodiment of the utility model electric power secondary system.This electric power secondary system comprises the load equipment 3 as secondary device, between it and the power supply unit 1 as primary equipment, be provided with driver module 2, wherein between power supply unit 1 and driver module 2, all by stube cable, be connected between driver module 2 and load equipment 3.
In the present embodiment, power supply unit 1 is AC power supply device, as common civil power 220V or 380V; Driver module 2 is AD-CD (AC-DC) driver module, also can be AC-AC driver module; Stube cable is shielded type cable 4, and it is connected to lightning protection circuit, to lightning current is introduced to the earth, improves thus the fail safe of system.Especially, in the present embodiment.In order to make lightning current secure flows mistake, between each circuit element, all by shielded type cable 4, connect, its terminals are screwed.
The lightning protection circuit of the present embodiment comprises secondary lightning protection circuit, specifically two-stage earth element 5, preferably: first order earth element 5 is closed spark gap, be connected between the input and earth terminal of driver module 2, the lightning current of can releasing can reach 20KA; Second level earth element 5 discharge tubes, are connected between the output and earth terminal of driver module 2, and the fraction thunder-strike current of the driver module 2 of flowing through is further discharged, and to entering the residual voltage of load equipment 3, remake current limliting one time, make it lower than specified safe range.This just can make most of thunder-strike current release by the first order earth element 4 of driver module 2 inputs, the residual voltage that the second level earth element 5 of driver module 2 output settings can make to enter load is less, thereby be conducive to prevent that load is struck by lightning, improve its safety in utilization, extend its useful life.
Above-mentioned first order earth element 5, second level earth element 5 all can select the earth resistance of Zinc-oxide piezoresistor or other type to replace, and have equally good lightning protection effect.When lightning current is larger, Zinc-oxide piezoresistor is breakdown, and lightning current flows into earth terminal through Zinc-oxide piezoresistor rapidly, and the residual voltage that enters load equipment 3 is clamped in preset range.
Owing to being provided with secondary lightning protection, come most of thunder-strike current of Self Powered Device 1 circuit transmission line to release by first order earth element 5, and that second level earth element 5 make to enter the residual voltage of load equipment 3 is less.This is conducive to prevent that load is struck by lightning, and improves safety in utilization, extends its useful life.
As mentioned above, between power supply unit 1 and driver module 2, be all connected by shielded type cable 4 between driver module 2 and load equipment 3, the screen of shielded type cable 4 wherein is all connected to ground, below further illustrates.
Referring to Fig. 2, represent the earthing mode of shielded type cable 4.Load equipment 3 is connected with power supply unit 1 by shielded type cable 4, this shielded type cable 4 consists of cable core and cable shield, this cable shield wraps cable core to reduce electromagnetic interference, wherein: shielded type cable 4 passes through earth element 5 ground connection near one end cable shield of power supply unit 1, and shielded type cable 4 is near the direct ground connection of other end cable shield of load equipment.
In practical power systems, the length of shielded type cable 4 is generally greater than 20m, therefore can make earth element 5 be connected to apart from the position of power supply unit 4m～6m.This earth element 5 can be earth resistance, and particular type can be (certainly also can be other element) such as Zinc-oxide piezoresistors.The resistance of this earth resistance equates with the equivalent resistance of the cable shield of shielded type cable 4, also can choose separately according to actual conditions.
Shielded type cable 4 between this embodiment load equipment 3 and power supply unit 1 has adopted 2 grounding schemes, thereby has still kept the good anti-jamming effectiveness of 2 grounding schemes of tradition; Due to shielded type cable 4 near one end cable shield of power supply unit 1 by earth element ground connection, be conducive to earth current or disturb current limliting, avoid thus earth-current or disturbed the danger of burning screen when excessive, also can reach electromagnetic compatibility effect preferably, and can not cause negative antenna effect simultaneously.
Referring to Fig. 3, represent the concrete structure of shielded type cable.In the external protection 41 of this shielded type cable 4, be provided with many heart yearns 45, wherein every heart yearn is enclosed with inner protective layer 43; Especially, in external protection, 41 layers are provided with cable shield 42, and the inner side of inner protective layer 43 is provided with heart yearn screen 44.
Because heart yearn and the cable self of shielded type cable 4 all arranges screen, can suppress interference and extraneous interference between heart yearn, particularly: the heart yearn of shielded type cable has all designed heart yearn screen, be conducive to the electromagnetic radiation, electrostatic coupling and the electromagnetic induction that suppress to produce between heart yearn; Self arranges cable shield cable, is conducive to the electromagnetic interference that suppresses outside; This two aspects factor, has eliminated the interference that electric power secondary system shielded type cable produces preferably, is conducive to guarantee the accuracy of data.
Preferably, the two ends of cable shield 42 and heart yearn screen 44 are ground connection respectively, to effectively reduce interference source.More preferably, be make cable shield 42 and heart yearn screen 44 near one end of power supply unit 1 by earth element 5 ground connection, cable shield 42 and or heart yearn screen 44 near the direct ground connection in one end of load equipment 3.
The electric power secondary system of the utility model embodiment has filtering decoupling formula anti-interference function, below describes.
Referring to Fig. 4, it is the preferred embodiment of driver module.This electric power secondary system comprises load equipment 3, and it is connected to the output of power supply unit 1 by driver module 2, in order to the alternating current that power supply unit 1 is provided, is converted to the required alternating current of load equipment 3 or direct current; Especially, the input stage of this driver module 2 is provided with filtering decoupling circuit 20, it is preferably RC filtering decoupling circuit, by the current-limiting resistance R being connected in series and filter capacitor C, formed, make thus the output plus terminal of power supply unit and current-limiting resistance R and the filter capacitor C that output ground termination enters serial connection, can suppress to come the differential mode interference of Self Powered Device 1, the accuracy of proof load equipment 3 transfer of data.
Filtering decoupling circuit 20 in the present embodiment is RC filtering decoupling circuit, and it,, as the preposition simulation low-pass filter of AC signal input channel, has jamproof effect concurrently; Between two terminals of alternating current-direct current signal input channel, access decoupling capacitance, can be high frequency differential mode interference signal bypass is provided.Be in passing with pointing out, from anti-interference angle, consider, RC filter is better than LC filter: RC filter is dissipation type filter, noise energy can be become to thermal energy consumption and dissipate; LC filter can produce additional magnetic interference, thereby inductance will add radome.
Driver module 2 in above-described embodiment can be optimized, the driver module 2 of this example comprises the parts such as rectification circuit 21, power factor (PF) Circuit tuning 22, filter circuit 23, inverter circuit 24 and microcontroller circuit 25, man-machine interface circuit 26 successively, wherein: rectification circuit 21 forms (being preferably full bridge rectifier) by rectifier diode or bridge heap, comprise necessary interference filtering circuit, its major function is that alternating current is converted to direct current; Circuit of power factor correction 22 is selectable unit (SU), power semiconductor and control chip, consist of, it is also connected to the Active PFC end of microcontroller circuit 25, and effect is to make input current approach sine wave, reduce mains by harmonics content, realize the object that improves power factor; Filter circuit 23 (being preferably RC filter circuit) is mainly comprised of elements such as electrochemical capacitors, completes galvanic filtering and energy storage effect; Inverter circuit 24 is comprised of power model and drive circuit, and power model can be Intelligent Power Module, and it is also connected to the driving signal end of described microcontroller circuit, and its major function is, completes direct current to the conversion of three-phase alternating current, realizes frequency modulation and voltage modulation object; Microcontroller circuit 25 is comprised of microprocessor (DSP) and peripheral circuit; the order that it is sent according to man-machine interface circuit 26; send corresponding command signal; power ratio control factor correcting circuit 22 and inverter circuit 24 work; and according to circuit feedback information, carry out necessary circuit protection and troubleshooting.Like this, this embodiment controls the output mode of driver module by microcontroller circuit, is conducive to neatly by pre-provisioning request output voltage, thereby meets the demand of different user.
Referring to Fig. 5, be the embodiment of part circuit structure in driver module.Specifically, for the inverter circuit of motor 31 and the example of microcontroller circuit, its working method is: civil power becomes direct current through rectification circuit 21, after electrochemical capacitor filtering, and the two ends of the DC power supply 241 of access inverter circuit 24.And the microprocessor of microcontroller circuit 25 (MCU/DSP) 251 is according to the setting signal of man-machine interface circuit 26, the motor 31 of load equipment 3 is controlled.
In the present embodiment, inverter circuit 24 comprises power pipe driving chip 242, this power pipe driving chip 242 is connected to the microprocessor 251 of microcontroller circuit 25, to according to the pulse width modulating signal of microprocessor 251 outputs, drive corresponding power tube alternate conduction and shutoff.Concrete, described inverter circuit 24 comprises 6 power tube S1～S6, and these six power tubes are divided into three groups, and every group power is controlled one group of terminals of three phase electric machine 31.
During start, microprocessor 251 produces corresponding 6 road pulse width modulating signals according to the motor speed of setting, and drives signal PWM1～PWM6; By power pipe driving chip 242, drive 6 power tubes (MOSFET or IGBT) S1～S6; The alternate conduction of these power tubes and shutoff, produce three-phase modulations waveform, and output voltage is adjustable, the three-phase alternating current of changeable frequency, outputs to U, V, the W terminals of motor 31, thereby realizes the stepless frequency control of motor 31.
Below be only preferred implementation of the present utility model, it should be pointed out that above-mentioned preferred implementation should not be considered as restriction of the present utility model, protection range of the present utility model should be as the criterion with claim limited range.For those skilled in the art, within not departing from spirit and scope of the present utility model, can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. the stube cable of an electric power secondary system, described electric power secondary system comprises the primary equipment that contains power supply unit and the secondary device that contains load equipment, between described power supply unit and described load equipment, driver module is set, between the input of described driver module and earth terminal, be provided with the first lightning protection circuit, between the output of described driver module and earth terminal, be provided with the second lightning protection circuit, described driver module comprises for alternating current being converted to galvanic rectification circuit, for realizing the filter circuit of galvanic filtering and energy storage effect and realizing the inverter circuit of frequency modulation and voltage modulation to alternating current conversion for completing direct current, between described power supply unit and described driver module, between described driver module and described load equipment, all by stube cable, be connected, it is characterized in that, described stube cable is shielded type cable, many heart yearns are set in the external protection of described shielded type cable cable, described heart yearn is enclosed with inner protective layer.
2. the stube cable of electric power secondary system as claimed in claim 1, is characterized in that, the inner side of the external protection of described shielded type cable is provided with cable shield, and the inner side of the inner protective layer of described shielded type cable is provided with heart yearn screen.
3. the stube cable of electric power secondary system as claimed in claim 2, it is characterized in that, described shielded type cable passes through earth element ground connection near cable shield described in one end of described power supply unit and described heart yearn screen, and described shielded type cable is near cable shield described in the other end of described load equipment and the direct ground connection of described heart yearn screen.
4. the stube cable of electric power secondary system as claimed in claim 3, is characterized in that, the length of described shielded type cable is greater than 20m, and described earth element is connected to the position apart from described power supply unit 4m～6m.
5. the stube cable of electric power secondary system as claimed in claim 3, is characterized in that, described earth element is earth resistance, and described earth resistance is Zinc-oxide piezoresistor.
6. the stube cable of electric power secondary system as claimed in claim 1, it is characterized in that, described rectification circuit is full bridge rectifier, described filter circuit is RC filter circuit, described inverter circuit comprises power pipe driving chip and some power tubes, and microcontroller circuit consists of microprocessor and peripheral circuit.
7. the stube cable of electric power secondary system as claimed in claim 6, it is characterized in that, described power pipe driving chip is connected to the power take-off of microcontroller circuit, so that the pulse width modulating signal according to the microprocessor output of described microcontroller circuit, drives corresponding power tube alternate conduction and shutoff.
8. the stube cable of electric power secondary system as claimed in claim 7, it is characterized in that, described driver module comprises power factor (PF) Circuit tuning man-machine interface circuit, described power factor (PF) Circuit tuning is arranged between described rectification circuit and described filter circuit, described power factor (PF) Circuit tuning is connected to the Active PFC end of described microcontroller circuit, and described man-machine interface circuit is connected to the input of described microcontroller circuit.
9. the stube cable of electric power secondary system as claimed in claim 1, it is characterized in that, the input stage of described driver module is provided for suppressing the RC filtering decoupling circuit from the differential mode interference of described power supply unit, and described RC filtering decoupling circuit forms by being serially connected with the output plus terminal of described power supply unit and exporting current-limiting resistance and the filter capacitor held.
10. the stube cable of electric power secondary system as claimed in claim 1, is characterized in that, described the first lightning protection circuit comprises closed spark gap or earth resistance, and described the second lightning protection circuit comprises discharge tube or earth resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420384290.XU CN203951186U (en) | 2014-07-11 | 2014-07-11 | The stube cable of electric power secondary system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420384290.XU CN203951186U (en) | 2014-07-11 | 2014-07-11 | The stube cable of electric power secondary system |
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| Publication Number | Publication Date |
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| CN203951186U true CN203951186U (en) | 2014-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420384290.XU Expired - Fee Related CN203951186U (en) | 2014-07-11 | 2014-07-11 | The stube cable of electric power secondary system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113223762A (en) * | 2021-03-23 | 2021-08-06 | 湖北环一电磁装备工程技术有限公司 | Anti-electromagnetic interference shielding cable and dynamometer with same |
-
2014
- 2014-07-11 CN CN201420384290.XU patent/CN203951186U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113223762A (en) * | 2021-03-23 | 2021-08-06 | 湖北环一电磁装备工程技术有限公司 | Anti-electromagnetic interference shielding cable and dynamometer with same |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141119 Termination date: 20150711 |
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| EXPY | Termination of patent right or utility model |