CN214380314U - Distributed power supply circuit with secondary coil switching circuit - Google Patents
Distributed power supply circuit with secondary coil switching circuit Download PDFInfo
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- CN214380314U CN214380314U CN202022752466.0U CN202022752466U CN214380314U CN 214380314 U CN214380314 U CN 214380314U CN 202022752466 U CN202022752466 U CN 202022752466U CN 214380314 U CN214380314 U CN 214380314U
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Abstract
The utility model discloses a distributed power supply circuit with secondary coil switching circuit, include: the switching circuit is connected with the switching circuit, a current judging circuit is arranged between the switching circuit and the plurality of parallel main circuits, when the bus current is in different range values, the current judging circuit judges and selects the main circuit to output, and the switching circuit is connected with the subsequent output until the load is connected; the front circuit is a CT magnetic ring, the output ends are a plurality of secondary coil output ends, the main circuit and the secondary coils are in one-to-one correspondence, the main circuit comprises a strong current impact prevention circuit and a subsequent EMC filter circuit, and the EMC filter circuit is connected with the switching circuit; the utility model discloses can collect the energy under power cable earth connection electric current 1A, can also guarantee that heavy current CT is difficult to the saturation to can adjust the impedance of load, solved the short-term internal grounding line on the current take place to change the damage that causes follow-up circuit by a wide margin, guarantee the normal work of load.
Description
Technical Field
The utility model belongs to the electric power system field relates to a distributed generator undercurrent power supply system, especially a distributed generator circuit with secondary coil switching circuit.
Background
In the power system, to improve the health level of the power system equipment, the state of the power equipment needs to be monitored on line and in real time, so that the purposes of early warning and overhauling are achieved. The real-time and on-line monitoring of the devices needs to depend on a large number of sensing and measuring devices, and as a plurality of power devices are distributed in different places, such as monitoring joints of power cables, the sensors and the monitoring devices need to be installed near cable grounding boxes along the cable laying path, and power supplies for the monitoring devices are not easy to obtain sometimes, so that how to provide a certain reliable, stable and economical power supply is a very important problem.
However, after a corresponding reliable, stable and economical power supply is provided, the specific power supply needs to obtain the electric energy for supplying the load from the ground wire through a transformation principle, particularly, a corresponding current transformer is sleeved on the ground wire, the dynamic range of the current on the ground wire is large and is usually between 1 and 200A, when lightning strikes occur, the current induced on the ground wire can even reach thousands a, and in the face of the current with the large dynamic range, how to ensure the stable operation of a rear-stage circuit becomes an important problem.
In order to solve the problems mentioned above, the relay switching circuit applied to the ground wire is designed according to the application requirements of practical products, different turns of the secondary coil of the CT are switched through the relay, so that the stable operation of the rear stage can be guaranteed, and the characteristic of load impedance matching can be reasonably utilized.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need to overcome at least one of the above-mentioned deficiencies in the prior art. The utility model provides a distributed power supply circuit with secondary coil switching circuit includes:
the switching circuit is connected with the switching circuit in parallel, a current judging circuit which judges the connection with the corresponding main circuit through the current judging circuit is arranged between the switching circuit and the main circuits in parallel, when the bus current is in different range values, the judgment is carried out through the current judging circuit, when the bus current accords with a preset rule, the corresponding main circuit is selected to output, and the switching circuit is connected with the subsequent output until the load is connected; the front-end circuit is a CT magnetic ring, the output end is a plurality of secondary coil output ends, the main circuit corresponds to the secondary coils one by one, the secondary coils comprise N1 coils, N2 coils and Nn coils, the main circuit comprises a strong current impact prevention circuit and an EMC filter circuit connected behind the strong current impact prevention circuit, and the EMC filter circuit is connected with the switching circuit.
The main circuits connected with the coils of the N1 and the N2 … Nn are selected to output through the switching circuit according to the range of the sudden large current of the grounding wire, and the corresponding number of turns can be determined through a formula and a test.
The technical scheme provides a new design idea, coils with different turns are designed on a CT secondary coil according to different sizes of grounding wire burst currents, when the grounding wire burst currents are in different ranges, main circuits of the coils with different turns of the CT secondary coil are switched and connected, and electric energy is output outwards through corresponding protection circuits, so that the newly designed CT can collect energy under the condition that the grounding wire currents of a power cable are 1A, the large-current CT is not easy to saturate, the impedance of a load can be adjusted, the problem that the current on the grounding wire in short time is greatly changed to damage a subsequent circuit is solved, and the normal work of the subsequent energy-taking power supply load is ensured.
In addition, according to the utility model discloses a distributed power supply circuit with secondary coil switching circuit still has following additional technical characteristics:
further, the strong current impact preventing circuit comprises a piezoresistor connected in series with a gas discharge tube. Because the parasitic capacitance of the gas discharge tube is small, the total capacitance of the series branch can be reduced, thereby reducing the leakage current, and the impact on the subsequent circuit can be prevented under the condition of instantaneous large current, as shown in fig. 3.
Further, the switching circuit is a relay switching circuit.
Furthermore, the number of the main circuits connected in parallel is 2, the number of the secondary coils is 2, the input end of the main circuit is connected with the output end of the secondary coil of the CT magnetic ring, the main circuit comprises a strong current impact prevention circuit, an EMC filter circuit connected to the rear side of the strong current impact prevention circuit, and a relay switching circuit connected to the rear side of the EMC filter circuit, the rear side of the relay switching circuit is connected to a load, the current judgment circuit comprises a control unit and a totem pole, and the current judgment circuit is connected with the relay switching circuit.
The CT magnetic ring is sleeved in a corresponding grounding wire, the secondary coil forms two groups of coils (N1 and N2 coils) with different turns, the design of the turns is designed according to the sudden large current value of the grounding wire and the subsequent circuit protection requirements, one group of the coils is corresponding to the condition that the sudden large current of the grounding wire is 1-50A, the turns are smaller, the other group of the coils is corresponding to the condition that the sudden large current of the grounding wire is larger than 50A, the turns are more, and when the sudden large current of the grounding wire is 1-50A, the main circuit connected with the coils with the smaller turns is enabled to output through the relay switching circuit; when the burst large current of the grounding wire is larger than 50A, the main circuit of the coil with larger number of turns is connected to output through the relay switching circuit.
The secondary coil can adopt a three-tap mode, and the unused tap can be disconnected. The relay adopts a magnetic latching relay, so that the system can reach a minimum energy consumption state. The external Rogowski coil judges the bus current, when the detected current is larger than 50A, a control unit, such as a singlechip, controls the output of the rising column through a pin to enable an MOS _ ON signal to be at a high level, an MOS tube is conducted, and then a 2-coil relay is closed while a 1-coil relay is opened.
When the current is larger than 50A, the main circuit connected with the coil with more turns is selected to output, so that the impedance of the output current and the increased load can be reduced, the impedance of the load is close to the impedance of the coil with less turns when the load is output, the change of the load impedance is kept not fast to the maximum extent, the deep saturation of the iron core can be inhibited, and the peak voltage of the output end is not high.
Further, the output side of the switching circuit is connected with an energy release circuit, and the output side of the energy release circuit is connected with a load. When the ground line current reaches a high current state for a long time, an energy release circuit is needed to limit the excessive energy output.
When the output voltage of the pre-stage rectifying circuit is lower, the energy discharge circuit does not work, the MOS tube in the energy discharge circuit is not conducted at the moment, when the output voltage of the rectifying circuit is higher, the current raises the voltage through the specific resistor in the energy discharge circuit, once the gate voltage of the MOS tube in the energy discharge circuit is raised to V, the field effect tube starts to be conducted, the redundant energy current can be discharged through the power resistor, and the VCC value for energy release is set to be
The distributed power circuit of the secondary coil switching circuit is applied to a CT energy taking circuit under the following scenes:
the high-voltage cable and the on-line monitoring are arranged in the electric power tunnel, and as the electric power tunnel is far away from the monitoring room, the field can not be supplied with power through a long-distance power transmission line and can not transmit field data to the monitoring room in a wired mode, the energy is obtained from a grounding line and is supplied to equipment with an independent power supply (usually a battery); however, in the process of taking energy by adopting the CT coil, if the current of the grounding wire can be stabilized in a normal state, a more complex switching circuit and various protection circuit designs are not needed, but in an actual working condition, the current of the grounding wire can often have a sudden large current situation, so that corresponding measures such as protection and the like are needed in the CT coil energy taking circuit.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of the CT power supply and the ground wire connection according to the embodiment of the present invention;
FIG. 2 is a schematic diagram of two windings of the CT coil according to the present invention;
fig. 3 is a schematic diagram of a distributed power supply circuit with a secondary coil switching circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an energy release circuit according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "lateral", "vertical", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise expressly specified or limited, the terms "coupled," "communicating," "connected," "coupled," and "coupled" are to be construed broadly and can, for example, be fixedly coupled, integrally coupled, or detachably coupled; may be communication within two elements; can be directly connected or indirectly connected through an intermediate medium; the term "fit" can be a surface-to-surface fit, a point-to-surface or a line-to-surface fit, and also includes a hole-axis fit, and a person skilled in the art can understand the specific meaning of the above terms in the present invention in specific situations.
The utility model discloses a conceive as follows, according to earth connection burst current variation in size, the coil of the different turns of design on CT secondary coil, when earth connection burst current under the scope circumstances of difference, the main circuit of the different turns of coil of switching connection CT secondary coil and through the outside output electric energy of corresponding protection circuit, the CT of so new design not only can collect the energy under power cable earth connection current 1A, can also guarantee that heavy current CT is difficult to the saturation, and can adjust the impedance of load, when so solved on the short-term internal grounding wire current take place the damage that the change caused by a wide margin to follow-up circuit, guarantee follow-up normal work of getting the power supply load.
The aligning device for the steel bonding sheet of the present invention will be described with reference to the accompanying drawings, wherein fig. 1 is a schematic diagram of the connection between the CT power supply and the ground wire of the embodiment of the present invention; FIG. 2 is a schematic diagram of two windings of the CT coil according to the present invention; fig. 3 is a schematic diagram of a distributed power supply circuit with a secondary coil switching circuit according to an embodiment of the present invention; fig. 4 is a schematic diagram of an energy release circuit according to an embodiment of the present invention.
The high-voltage cable and the online monitoring are arranged in the electric power tunnel, and the electric power tunnel is far away from the monitoring room, so that power cannot be supplied on site and on-site data cannot be transmitted to the monitoring room in a wired mode. Therefore, the power taking mode of CT induction power supply and solar panel input is adopted on site, and power is provided for each distributed monitoring device. The whole product is arranged in a grounding box, and the grounding box collects A, B, C grounding currents on three phases. The product operation mode adopts an intermittent operation mode, and a typical time of the intermittent operation mode is that a charging period is 1 hour, then a rear-end load works, and the operation time when power is supplied to the load is 15 seconds, as shown in fig. 1.
As shown in fig. 3, according to an embodiment of the present invention, a distributed power supply circuit having a secondary coil switching circuit includes: a plurality of parallel main circuits from the output end of the pre-circuit, a plurality of parallel main circuits are connected with a switching circuit, a current judging circuit which judges through the current judging circuit and is connected with the corresponding main circuits is arranged between the switching circuit and the plurality of parallel main circuits, when the bus current is in different range values, the current judging circuit judges through the current, when the bus current accords with the preset rule, the corresponding main circuit is selected to output, the switching circuit is connected with the subsequent output until the load is connected, as shown in fig. 3, the two ends of C11 in the subsequent circuit through the switching circuit are the output ends;
the front-end circuit is a CT magnetic ring, the output end is a plurality of secondary coil output ends, the main circuit corresponds to the secondary coils one by one, the secondary coils comprise N1 coils, N2 coils and Nn coils, the main circuit comprises a strong current impact prevention circuit and an EMC filter circuit connected behind the strong current impact prevention circuit, and the EMC filter circuit is connected with the switching circuit.
According to an embodiment of the present invention, the CT can be installed in the grounding box, in order to improve the CT conversion efficiency, the CT is preferably a complete magnetic ring, and a 150k permeability ultra-microcrystalline iron core is adopted for obtaining energy on the three-phase grounding wire of the 1A power cable, it is found in the experiment that when the current on the grounding wire is generally in the range of 1-200A, if the secondary coil has too few turns, the energy obtaining coil will enter the saturated state too early, and if the number of turns is too many, the induced voltage will not be large enough when 1A, therefore, multiple groups of coils are wound on the CT output end, as shown in fig. 2, by winding N1 turns on the CT secondary output end 1 coil, and winding N2 turns on the 2 coil, it can be ensured that even if the primary current changes greatly, the CT will not enter the deep saturated state, and the impedance of the load can be adjusted, so that the maximum output power can be obtained under large current, SW1 and SW2 are relay switches, in the range of current of 1-50A, the output of the 1 coil is connected with a load for supplying power; in the current range of 50-several thousand A, 2 coils are connected to load for supplying power. The winding adopts a multi-tap mode, and the tap which is not used can be disconnected.
According to an embodiment of the present invention, the strong current surge prevention circuit comprises a varistor connected in series with the gas discharge tube. Because the parasitic capacitance of the gas discharge tube is small, the total capacitance of the series branch can be reduced, thereby reducing the leakage current, and the impact on the subsequent circuit can be prevented under the condition of instantaneous large current, as shown in fig. 3.
According to the utility model discloses an embodiment, switching circuit is relay switching circuit.
According to the utility model discloses an embodiment, a plurality of parallelly connected the main circuit is parallelly connected for 2 the main circuit, secondary coil quantity is 2, the main circuit input couples CT magnetic ring secondary coil output, the main circuit includes the strong current surge prevention circuit, links and is in the strong current surge prevention circuit rear side EMC filter circuit links and is in the relay switching circuit of EMC filter circuit rear side, relay switching circuit rear side is up to linking load, the current judges that the circuit includes the control unit and totem pole and, the current judges that the circuit links relay switching circuit.
The CT magnetic ring is sleeved in a corresponding grounding wire, the secondary coil forms two groups of coils (N1 and N2 coils) with different turns, the design of the turns is designed according to the sudden large current value of the grounding wire and the subsequent circuit protection requirements, one group of the coils is corresponding to the condition that the sudden large current of the grounding wire is 1-50A, the turns are smaller, the other group of the coils is corresponding to the condition that the sudden large current of the grounding wire is larger than 50A, the turns are more, and when the sudden large current of the grounding wire is 1-50A, the main circuit connected with the coils with the smaller turns is enabled to output through the relay switching circuit; when the burst large current of the grounding wire is larger than 50A, the main circuit of the coil with larger number of turns is connected to output through the relay switching circuit.
The secondary coil can adopt a three-tap mode, and the unused tap can be disconnected. The relay adopts a magnetic latching relay, so that the system can reach a minimum energy consumption state. The external rogowski coil judges the bus current, when the detected current is larger than 50A, a control unit, such as a single chip microcomputer, controls the output of the rising column through a pin to enable an MOS _ ON signal to be high level, an MOS tube is conducted, and then a 2-coil relay is closed and a 1-coil relay is opened, as shown in fig. 2.
When the current is larger than 50A, the main circuit connected with the coil with more turns is selected to output, so that the impedance of the output current and the increased load can be reduced, the impedance of the load is close to the impedance of the coil with less turns when the load is output, the change of the load impedance is kept not fast to the maximum extent, the deep saturation of the iron core can be inhibited, and the peak voltage of the output end is not high.
According to some embodiments of the invention, the switching circuit output side is coupled to an energy bleeding circuit, the energy bleeding circuit output side is coupled to a load. When the ground line current reaches a large current state for a long time, an energy release circuit is needed to limit the excessive energy output, as shown in fig. 3 and 4, VCC in fig. 4 is connected with the output end at the upper end of C11 in fig. 3.
When the output voltage of the pre-stage rectifying circuit is lower, the energy discharge circuit does not work, the MOS tube in the energy discharge circuit is not conducted at the moment, when the output voltage of the rectifying circuit is higher, the current raises the voltage through the specific resistor in the energy discharge circuit, once the gate voltage of the MOS tube in the energy discharge circuit is raised to V, the field effect tube starts to be conducted, the redundant energy current can be discharged through the power resistor, and the VCC value for energy release is set to be
Any reference to "one embodiment," "an embodiment," "example embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. This schematic representation in various places throughout this specification does not necessarily refer to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.
While the invention has been described in detail and with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. In particular, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the appended claims without departing from the spirit of the invention. Except variations and modifications in the component parts and/or arrangements, the scope of which is defined by the appended claims and equivalents thereof.
Claims (5)
1. A distributed power circuit having a secondary coil switching circuit, comprising: a plurality of parallel main circuits from the output end of the front circuit, a plurality of parallel main circuits are connected with a switching circuit, a current judging circuit which judges the connection with the corresponding main circuit through a current judging circuit is arranged between the switching circuit and the plurality of parallel main circuits, and the switching circuit is connected with the subsequent output till the connection with a load;
the front-end circuit is a CT magnetic ring, the output end is a plurality of secondary coil output ends, the main circuit corresponds to the secondary coils one by one, the secondary coils comprise N1 coils, N2 coils and Nn coils, the main circuit comprises a strong current impact prevention circuit and an EMC filter circuit connected behind the strong current impact prevention circuit, and the EMC filter circuit is connected with the switching circuit.
2. The distributed power circuit with secondary coil switching circuitry according to claim 1, wherein said strong current surge prevention circuit comprises a varistor connected in series with a gas discharge tube.
3. The distributed power circuit with secondary coil switching circuitry as recited in claim 1, wherein the switching circuitry is a relay switching circuitry.
4. The distributed power circuit with secondary coil switching circuit according to claim 1, wherein a plurality of said main circuits connected in parallel is 2 said main circuits connected in parallel, the number of said secondary coils is 2, said main circuit input terminal is connected with said CT magnet ring secondary coil output terminal, said main circuit includes a strong current surge preventing circuit, said EMC filter circuit connected with a rear side of said strong current surge preventing circuit, a relay switching circuit connected with a rear side of said EMC filter circuit, said rear side of said relay switching circuit is connected with a load, said current judging circuit includes a control unit and a totem pole and said current judging circuit is connected with said relay switching circuit.
5. The distributed power circuit with secondary coil switching circuitry according to claim 1, wherein the switching circuit output side is tied to an energy bleed circuit, the energy bleed circuit output side being tied to a load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022752466.0U CN214380314U (en) | 2020-11-25 | 2020-11-25 | Distributed power supply circuit with secondary coil switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022752466.0U CN214380314U (en) | 2020-11-25 | 2020-11-25 | Distributed power supply circuit with secondary coil switching circuit |
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| Publication Number | Publication Date |
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| CN214380314U true CN214380314U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022752466.0U Active CN214380314U (en) | 2020-11-25 | 2020-11-25 | Distributed power supply circuit with secondary coil switching circuit |
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| CN (1) | CN214380314U (en) |
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- 2020-11-25 CN CN202022752466.0U patent/CN214380314U/en active Active
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