CN101989821A - Self-powered device and power cabinet - Google Patents
Self-powered device and power cabinet Download PDFInfo
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- CN101989821A CN101989821A CN2009100907747A CN200910090774A CN101989821A CN 101989821 A CN101989821 A CN 101989821A CN 2009100907747 A CN2009100907747 A CN 2009100907747A CN 200910090774 A CN200910090774 A CN 200910090774A CN 101989821 A CN101989821 A CN 101989821A
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Abstract
The embodiment of the invention provides a self-powered device and a power cabinet. The self-powered device comprises a current transformer, a rectifying circuit and a voltage limiting circuit, wherein the current transformer is sleeved outside a main loop power cord and used for generating induction current; the rectifying circuit is connected with the current transformer and used for rectifying induction current and outputting direct current; and the voltage limiting circuit is connected with the rectifying circuit and used for limiting the voltage of the direct current to obtain and output a first preset voltage. In the invention, the induction current is generated through using the current transformer, and voltage used for supplying power to a load is obtained through the rectifying circuit and the voltage limiting circuit, thereby the purpose of supplying power to the load by using the induction current generated by the current transformer is achieved under the condition of no external power supply. The self-powered device has the advantages of small volume, convenient mounting and no energy waste.
Description
Technical field
The present invention relates to power technology, relate in particular to self-power supply device and electric power cabinet in a kind of medium voltage electricity power supply unit.
Background technology
Electrical energy production and consume system that electric power system is made up of links such as generating, power transformation, transmission of electricity, distribution and electricity consumptions.Its function is that natural primary energy is changed into electric energy by generation power device, supply power to each load center through power transmission and transformation system and distribution system again, convert multi-form energy such as power, heat, light by various device again to, be regional economy and people's lives service.
In correlation technique,, must carry out monitoring and measuring to the ruuning situation of power equipment in order to guarantee the power system security economical operation.If fault has taken place in the force device of electric power system (for example: generator, circuit etc.); what make electric power system can not continue safe operation; relaying protection system in the electric power system need in time send warning signal to the operation operator on duty, perhaps directly controls circuit breaker and cuts off main circuit power supply.As can be seen, relay protector plays important effect to the safe operation of electric power system, in order to guarantee the normal operation of relay protector, need provide power supply stable and that continue for relay protector.
Relay protector can not directly insert high-tension apparatus No. one time, therefore, generally need change the high-voltage variable of primary system into low-voltage after, resupply relay protector and use.At present, the external power supply for the relay protector power supply comprises: voltage transformer (Pressure Transformer; Hereinafter to be referred as: PT) and DC power supply panel, i.e. direct current cabinet.
Voltage transformer is the transformer of a ribbon core, and it mainly is made up of first and second winding, iron core and insulator.Voltage transformer can convert high voltage to low-voltage in proportion, and winding of voltage transformer is connected on primary system, and secondary winding is succeeded non-electricity protector, thereby is embodied as the relay protector power supply.DC power supply panel is the relay protector supplying DC power source; it comprises the transformer that High Level AC Voltage (about 10 kilovolts) can be changed into low-voltage AC (about 220 volts); and necessary rectification circuit, very large energy can be provided, and have bigger volume.
For the volume of the voltage transformer of relay protector power supply, DC power supply panel all bigger; trouble very is installed also; in addition; because the energy that voltage transformer and DC power supply panel provide is very high; and relay protector only needs very little energy; therefore, objectively produce waste, increased the cost of equipment.
Summary of the invention
An object of the present invention is to provide a kind of self-power supply device, in order to solve the external power supply volume for the relay protector power supply in the prior art big, trouble be installed, be easy to generate the defective of energy dissipation, realization uses self-power supply device to power as relay protector.
Another object of the present invention provides a kind of electric power cabinet, and the cabinet that causes because of the relay protector power supply in order to solve electric power cabinet in the prior art is bigger, is the higher defective of relay protector power supply cost.
Some embodiments of the invention provide a kind of self-power supply device, comprising: current transformer, be sheathed with outside the main circuit power line, and be used to produce induced current; Rectification circuit connects current transformer, is used for induced current is carried out rectification, output DC; Pressure limiting circuit connects rectification circuit, is used for galvanic voltage is carried out pressure limiting, obtains first predetermined voltage and output.
The embodiment of self-power supply device of the present invention, by making Current Transformer produce induced current, and obtain voltage into electric by rectification circuit and pressure limiting circuit, realized not having under the situation of external power supply, the induced current that Current Transformer self is produced is an electric, this self-power supply device volume is little, easy for installation, can energy-producingly not waste.
Other embodiment of the present invention provides a kind of electric power cabinet, comprises main circuit power line, relay protector, also comprises self-power supply device, and this self-power supply device is used for providing power supply to relay protector; Wherein, this self-power supply device comprises: current transformer, be sheathed with outside the main circuit power line, and be used to produce induced current; Rectification circuit connects current transformer, is used for induced current is carried out rectification, output DC; Pressure limiting circuit connects rectification circuit, is used for galvanic voltage is carried out pressure limiting, obtains first predetermined voltage and output.
The embodiment of electric power cabinet of the present invention by built-in self-power supply device with smaller size smaller in the electric power cabinet, and for relay protector provides power supply, can reduce the volume of electric power cabinet cabinet, and has reduced the cost for the relay protector power supply.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation according to the self-power supply device of the embodiment of the invention;
Fig. 2 is the structural representation according to the electric power cabinet of the embodiment of the invention;
Fig. 3 is the structural representation according to the power source conversion of the embodiment of the invention;
Fig. 4 is the schematic diagram according to the tripartite energy power supply of the embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.
Further specify the technical scheme of the embodiment of the invention below in conjunction with the drawings and specific embodiments.
According to embodiments of the invention, a kind of self-power supply device is provided, Fig. 1 is the structural representation according to the self-power supply device of the embodiment of the invention, as shown in Figure 1, self-power supply device according to the embodiment of the invention comprises: current transformer 10, rectification circuit 12, pressure limiting circuit 14, DC/DC transducer 16, below, each functional module in the self-power supply device of the embodiment of the invention is described in detail.
Particularly, current transformer 10 is a straight-through current transformer, with the winding of main circuit power line as this current transformer 10, owing to be connected with alternating current (AlternatingCurrent in the main circuit power line; Abbreviate as: AC), current transformer 10 will induce corresponding electromotive force in secondary winding, and the secondary winding of current transformer 10 is connected with rectification circuit 12, thereby can produce induced current, and this induced current is an alternating current.
Need to prove,, need be selected according to different rectifier systems and load size if use diode as rectifier cell.As select improperly, might cause the circuit can not trouble free service, even diode may be burnt.
Preferably, self-power supply device can also comprise DC/DC transducer 16, connects pressure limiting circuit 14, is used for first predetermined voltage is converted to second predetermined voltage and output,, first predetermined voltage is carried out step-down once more that is, obtains second predetermined voltage.In an embodiment of the present invention, the load that connects DC/DC transducer 16 is a relay protector, and second predetermined voltage of DC/DC transducer 16 outputs is 24 volts, adapts with the operating voltage of relay protector, can power for relay protector.Because the energy that DC/DC transducer 16 provides is just in time used for relay protector, therefore can energy-producingly not waste.
DC/DC transducer 16 generally is made of control chip, inductance coil, diode, triode, capacitor.In addition, DC/DC transducer 16 can be divided three classes: step-up DC/DC transducer, voltage-dropping type DC/DC transducer and buck-boost type DC/DC transducer.Therefore the embodiment of the invention can select voltage-dropping type DC/DC transducer and buck-boost type DC/DC transducer owing to voltage need be dropped to 24 volts for the relay protector power supply.
Self-power supply device according to the embodiment of the invention, by making Current Transformer 10 produce induced current, and obtain voltage into electric by rectification circuit 12 and pressure limiting circuit 14, realized not having under the situation of external power supply, the induced current that Current Transformer self is produced is an electric, in addition, if behind pressure limiting circuit 14, connect a DC/DC transducer 16 again, the voltage of pressure limiting circuit 14 outputs is carried out the conversion of primary voltage again, make self-power supply device can adapt to the load of littler operating voltage, can power for different loads.This self-power supply device has little, the easy for installation characteristics of volume, and can energy-producingly not waste.
According to another embodiment of the present invention; a kind of electric power cabinet is provided; Fig. 2 is the structural representation according to the electric power cabinet of the embodiment of the invention; as shown in Figure 2; electric power cabinet according to the embodiment of the invention comprises: main circuit power line 20, self-power supply device 22 and the relay protector that is connected to self-power supply device 22 are (promptly; load) 24, wherein, self-power supply device 22 comprises: current transformer 220, rectification circuit 222, pressure limiting circuit 224, DC/DC transducer 226.Below, the electric power cabinet of the embodiment of the invention is elaborated.
Be connected with alternating current in the main circuit power line 20 of electric power cabinet, main circuit power line 20 can be passed through (promptly from a winding of the current transformer 220 of self-power supply device 22, it is outer that current transformer 220 is sheathed with main circuit power line 20), owing to be connected with alternating current in the main circuit power line 20, current transformer 220 will induce corresponding electromotive force in secondary winding, the secondary winding of current transformer 220 connects rectification circuit 222, thereby can produce induced current, and this induced current is an alternating current.
The main effect of rectification circuit 222 is that the alternating current that the secondary winding with current transformer 220 induces becomes direct current.Comprising the device with unilateal conduction characteristic in the rectification circuit 222, utilize the device with unilateal conduction characteristic, can be the current transformation of direction and big or small alternation direct current.In embodiments of the present invention, can use bridge rectifier, this bridge rectifier connects into bridge architecture as long as increase by two diodes.
DC/DC transducer 226 is connected to pressure limiting circuit 224, is used for first predetermined voltage is converted to second predetermined voltage and the output of relay protector 24 power supplies,, first predetermined voltage is carried out step-down once more that is, obtains second predetermined voltage.In an embodiment of the present invention, second predetermined voltage of DC/DC transducer 226 output is 24 volts, adapt with the operating voltage of relay protector 24, and can be that relay protector 24 is powered.Because the energy that DC/DC transducer 226 provides is just in time used for relay protector 24, therefore can energy-producingly not waste.
In addition, preferably, can also comprise DC power supply 33 and/or AC power 36 in the electric power cabinet of the embodiment of the invention, Fig. 3 is the structural representation according to the power source conversion of the embodiment of the invention, as shown in Figure 3, current transformer 30 connects first rectification circuit 31, and the induced current that current transformer 30 produces is relay protector 32 power supplies by first rectification circuit 31, pressure limiting circuit 34, DC/DC transducer 35; DC power supply 33 connects DC/DC transducer 35, and the direct current that DC power supply 33 produces is relay protector 32 power supplies by DC/DC transducer 35; AC power 36 connects second rectification circuit 37, and this second rectification circuit 37 connects DC/DC transducer 35, after the alternating current that AC power 36 produces is direct current by 37 rectifications of second rectification circuit, is relay protector 32 power supplies through DC/DC transducer 35.Preferably, above-mentioned first rectification circuit 31, second rectification circuit 37 can be the AC/DC transducer.In actual applications, can change above-mentioned three power supplies in the electric power cabinet, selecting suitable power supply is electric.In addition, can also guarantee under the situation that certain power supply breaks down that other power supply can continue power supply for relay protector.
Fig. 4 is the schematic diagram according to the tripartite energy power supply of the embodiment of the invention, as shown in Figure 4, one can the source be the induced current of Current Transformer Secondary side, after being converted to direct current by AC/DC, by the wide-voltage range Adaptable System (promptly, above-mentioned pressure limiting circuit) and voltage stabilizing circuit (that is) processing, above-mentioned DC/DC transducer, output direct-flow steady voltage; The opposing party's energy is DC power supply, by the direct current input interface circuit direct current is imported the wide-voltage range Adaptable System, and through after the processing of voltage stabilizing circuit, the output direct-flow steady voltage, third party's energy is AC power, after the alternating voltage input, at first through the AC/DC conversion, the direct current input wide-voltage range Adaptable System that obtains, through after the processing of voltage stabilizing circuit, the output direct-flow steady voltage.The tripartite energy can obtain stable direct current output, uses as power supply.
In sum, by means of at least one technical scheme in the technique scheme, by making Current Transformer produce induced current, and obtain voltage into electric by rectification circuit and pressure limiting circuit, realized not having under the situation of external power supply, the induced current that Current Transformer self is produced is an electric, in addition, if behind pressure limiting circuit, connect a DC/DC transducer again, the voltage of pressure limiting circuit output is carried out the conversion of primary voltage again, make self-power supply device can adapt to the load of littler operating voltage, can power for different loads.This self-power supply device has little, the easy for installation characteristics of volume, and can energy-producingly not waste.In addition,, and, can reduce the volume of electric power cabinet cabinet, and reduce cost for the relay protector power supply for relay protector provides power supply by built-in self-power supply device in the electric power cabinet with smaller size smaller.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a self-power supply device is characterized in that, comprising:
Current transformer is sheathed with outside the main circuit power line, is used to produce induced current;
Rectification circuit connects described current transformer, is used for described induced current is carried out rectification, output DC;
Pressure limiting circuit connects described rectification circuit, is used for described galvanic voltage is carried out pressure limiting, obtains first predetermined voltage and output.
2. device according to claim 1 is characterized in that, described self-power supply device further comprises:
The DC/DC transducer connects described pressure limiting circuit, is used for described first predetermined voltage is converted to second predetermined voltage and output.
3. an electric power cabinet comprises main circuit power line, relay protector; It is characterized in that: also comprise self-power supply device, described self-power supply device is used for providing power supply to described relay protector; Wherein, described self-power supply device comprises:
Current transformer is sheathed with outside the described main circuit power line, is used to produce induced current;
Rectification circuit connects described current transformer, is used for described induced current is carried out rectification, output DC;
Pressure limiting circuit connects described rectification circuit, is used for described galvanic voltage is carried out pressure limiting, obtains first predetermined voltage and output.
4. electric power cabinet according to claim 3 is characterized in that, described self-power supply device further comprises:
The DC/DC transducer connects described pressure limiting circuit, is used for described first predetermined voltage is converted to second predetermined voltage and output.
5. according to claim 3 or 4 described electric power cabinets, it is characterized in that described electric power cabinet also comprises:
AC power is connected to the DC/DC transducer of described self-power supply device, is used to described DC/DC transducer power supply.
6. according to claim 3 or 4 described electric power cabinets, it is characterized in that described electric power cabinet also comprises:
DC power supply is connected to the DC/DC transducer of described self-power supply device, is used to described DC/DC transducer power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100907747A CN101989821A (en) | 2009-08-06 | 2009-08-06 | Self-powered device and power cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100907747A CN101989821A (en) | 2009-08-06 | 2009-08-06 | Self-powered device and power cabinet |
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| Publication Number | Publication Date |
|---|---|
| CN101989821A true CN101989821A (en) | 2011-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100907747A Pending CN101989821A (en) | 2009-08-06 | 2009-08-06 | Self-powered device and power cabinet |
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| CN (1) | CN101989821A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270940A (en) * | 2011-07-20 | 2011-12-07 | 太原理工大学 | Electric field induction type power supplying method used for electric power monitoring device |
| CN102279336A (en) * | 2011-04-11 | 2011-12-14 | 湖北合众兆明光电技术有限公司 | Passive electric power line fault indicator and information remote transmission system thereof |
| CN102855729A (en) * | 2012-08-25 | 2013-01-02 | 于宝成 | Residual current type electric fire monitoring system capable of self-supplying power |
-
2009
- 2009-08-06 CN CN2009100907747A patent/CN101989821A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279336A (en) * | 2011-04-11 | 2011-12-14 | 湖北合众兆明光电技术有限公司 | Passive electric power line fault indicator and information remote transmission system thereof |
| CN102270940A (en) * | 2011-07-20 | 2011-12-07 | 太原理工大学 | Electric field induction type power supplying method used for electric power monitoring device |
| CN102855729A (en) * | 2012-08-25 | 2013-01-02 | 于宝成 | Residual current type electric fire monitoring system capable of self-supplying power |
| CN102855729B (en) * | 2012-08-25 | 2016-01-06 | 于宝成 | Automatic electricity getting residual-current electrical fire supervisory system |
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Address after: Baoju street 510730 Guangdong economic and Technological Development Zone No. 8 layer 2-5 Applicant after: Guangzhou Fokstone Electric Co., Ltd. Address before: Yuehai Group No. 555 building, 510050 Dongfeng Road Guangdong city of Guangzhou province 1604-1605 Applicant before: Guangzhou Fokstone Electric Co., Ltd. |
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Application publication date: 20110323 |