CN214100984U - Power supply device of on-line monitoring equipment of power transmission line - Google Patents
Power supply device of on-line monitoring equipment of power transmission line Download PDFInfo
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- CN214100984U CN214100984U CN202022983558.XU CN202022983558U CN214100984U CN 214100984 U CN214100984 U CN 214100984U CN 202022983558 U CN202022983558 U CN 202022983558U CN 214100984 U CN214100984 U CN 214100984U
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Abstract
The utility model discloses a power supply unit of transmission line on-line monitoring equipment, which comprises a magnetic core branch, a load branch and a control circuit, wherein the magnetic core branch comprises an energy-taking magnetic core and at least two matching capacitors with different capacitance values, the energy-taking magnetic core is an air gap magnetic core, the energy-taking magnetic core is sleeved on a transmission cable, and a secondary winding is wound on the energy-taking magnetic core; the control circuit comprises a measurement control module and a first change-over switch, wherein the measurement control module is used for controlling the first change-over switch to switch according to a current value on the power transmission cable obtained through real-time measurement so as to enable the corresponding matching capacitor to be connected with the energy-taking magnetic core in parallel; the load branch comprises a transformer and a rectifying circuit, two ends of a primary coil of the transformer are connected with power transmission lines on two sides of the energy-taking magnetic core, and two ends of a secondary coil of the transformer supply power for the online monitoring equipment through the rectifying circuit. The utility model discloses can stably get under the great range of change's of transmission line current value the condition can, for the power supply is stabilized to on-line monitoring equipment on the transmission line.
Description
Technical Field
The utility model belongs to the power equipment field especially relates to a power supply unit of transmission line on-line monitoring equipment.
Background
At present, more and more online monitoring devices are applied to power transmission lines to monitor line state information in real time and ensure the operation safety of the lines. The on-line monitoring equipment needs a stable power supply, however, various power supplies have a big problem, if the battery is directly equipped for supplying power to the equipment, the battery needs to be replaced frequently, a large amount of operators are needed to carry out a large amount of overhead work, and the feasibility is not achieved; or a solar power supply mode is used, but the mode is greatly influenced by weather and is also frequently powered off. The mode of utilizing electromagnetic induction's principle to get energy power supply has been produced at present, and specific saying so is exactly through establishing the coil on the transmission cable, and the electric current that the induction goes out and is in certain proportion with transmission cable medium current amplitude is used for supplying power, and the benefit of this mode lies in that the back need not be changed once to install, does not receive the influence of weather yet. However, this approach also has problems: when the current value on the transmission cable is large, the magnetic core of the coil is easy to saturate, the output voltage of the coil can generate a peak with a very high amplitude to influence the electricity utilization safety, the loss of the magnetic core can be increased to cause heating, and the service life of the magnetic core is greatly influenced. For solving the problem, the air gap is opened for the energy-taking magnetic core to reduce the magnetic conductivity, the saturation current value of the magnetic core is increased, the saturation of the magnetic core can be effectively inhibited, but another problem is brought, namely, the magnetic core cannot induce the electric energy required by the online monitoring equipment when the current of the power transmission cable is small, and the power failure of the online monitoring equipment can still be caused to normally operate. Therefore, the change range of the current value on the power transmission line is large, so that the power supply of the on-line monitoring equipment on the power transmission line is difficult in the prior art by using the electromagnetic induction principle to obtain power, and more on-line monitoring equipment cannot normally operate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a power supply unit of transmission line on-line monitoring equipment can effectively solve the above-mentioned problem for the on-line monitoring equipment power supply difficulty on the transmission line.
In order to solve the technical problem, the utility model adopts the following technical scheme: a power supply device of on-line monitoring equipment of a power transmission line comprises a magnetic core branch, a load branch and a control circuit, wherein the magnetic core branch comprises an energy-taking magnetic core and at least two matching capacitors with different capacitance values, the energy-taking magnetic core is an open-air gap magnetic core, the energy-taking magnetic core is sleeved on a power transmission cable, and a secondary winding is wound on the energy-taking magnetic core; the control circuit comprises a measurement control module and a first change-over switch, the first change-over switch comprises first gears with the same number as that of the matching capacitors, the matching capacitors are connected with the secondary winding through the corresponding first gears on the first change-over switch, and the measurement control module is used for controlling the first change-over switch to be switched among different first gears according to a current value on the power transmission cable obtained through real-time measurement so as to enable the corresponding matching capacitors to be connected with the energy-taking magnetic core in parallel; the load branch comprises a transformer and a rectifying circuit, two ends of a primary coil of the transformer are connected with power transmission lines on two sides of the energy-taking magnetic core, two ends of a secondary coil of the transformer are connected with the rectifying circuit, and an output end of the rectifying circuit is connected with the online monitoring equipment.
Preferably, the matching capacitor includes a first capacitor, a second capacitor and a third capacitor. The electric current variation range that different capacitance values adapted is different, and the matching that sets up the electric capacity of three different capacitance values can be more accurate gets can the magnetic core, makes to get can more stable, considers installation space's size simultaneously, and it is comparatively suitable to install three electric capacity.
Preferably, the measurement control module is internally provided with a first switching value, a second switching value and a third switching value which are sequentially increased, and when the measurement control module measures that the current value of the power transmission line is lower than the first switching value, the measurement control module controls the first switching switch to act so that the first capacitor is connected with the energy taking magnetic core in parallel; when the measuring control module measures that the current value of the power transmission line is higher than the first switching value and lower than the second switching value, the measuring control module controls the first switching switch to act so that the second capacitor is connected with the energy taking magnetic core in parallel; and when the measuring control module measures that the current value of the power transmission line is higher than the second switching value and lower than the third switching value, the measuring control module controls the first switching switch to act so that the third capacitor is connected with the energy taking magnetic core in parallel. Therefore, the proper matching capacitor can be selected and accessed according to different current value ranges of the power transmission line, so that the energy taking device can stably take energy within a larger current value change range and stably supply power for the online monitoring equipment.
Preferably, the measurement control module comprises a rogowski coil, and the rogowski coil is sleeved on the power transmission cable. The Rogowski coil is used for measuring the current value of the power transmission line, the response is sensitive, the real-time measurement can be realized, meanwhile, the stability is high, and the service life is long.
Preferably, the matching capacitors are all tunable capacitors. The capacitance of adjustable capacitor can be adjusted in a less within range to be fixed in a definite capacitance value after the adjustment, select for use adjustable capacitor can further make the more accurate matching of matching electric capacity and get the ability magnetic core, make to get to enable more stable.
Preferably, the online monitoring device further comprises a standby battery and a second change-over switch, the second change-over switch comprises two second gears, the output end of the rectifying circuit is connected with the online monitoring device through one second gear, the output end of the standby battery is connected with the online monitoring device through the other second gear, and the second change-over switch is connected with the measurement control module and used for controlling the second change-over switch to be switched between different second gears. The standby storage battery is arranged, the power supply of the online monitoring equipment is controlled by the load branch or the standby storage battery through the switching action of the second change-over switch, the selectivity is better, the power supply state of the standby storage battery can be timely switched to when the current value of the power transmission line is too large or too small, and the situation that the online monitoring equipment cannot work when the power failure occurs is avoided.
Preferably, a first threshold and a second threshold are further arranged in the measurement control module, when the measurement control module measures that the current value of the power transmission line is lower than the first threshold or higher than the second threshold, the measurement control module controls the second change-over switch to operate so that the standby storage battery is conducted with the online monitoring equipment, and when the measurement control module measures that the current value of the power transmission line is between the first threshold and the second threshold, the measurement control module controls the change-over switch to operate so that the output end of the rectification circuit is conducted with the online monitoring equipment. When the current value of the power transmission line is too small to enable the energy-taking magnetic core to obtain electric energy or when the current value of the power transmission line is too large to cause the energy-taking magnetic core to be saturated, the second change-over switch is controlled to act through the measurement control module to complete switching, the standby storage battery is used for temporarily supplying power, and the power supply stability of the online monitoring equipment and the self safety of the energy-taking magnetic core are guaranteed.
Compared with the prior art, the utility model discloses following beneficial effect has: the energy-taking magnetic core with the air gap is connected with the matching capacitor in parallel, so that the energy-taking magnetic core and the matching capacitor form a magnetic core branch, the load branch is taken as a whole, the equivalent impedance of the magnetic core branch and the input impedance of the load branch are equivalent to parallel connection, partial current of the power transmission line flows into the load branch, and the output of electric energy is realized. Because the regulating action who matches electric capacity, when the current value is less in the transmission line, magnetic core branch road equivalent impedance will the grow for the load branch road gets more transmission line electric currents, also when the transmission line current value is less, the utility model provides an it can also provide the electric energy for the load branch road to get can the device, and when the current value is great in the transmission line, because get can the magnetic core for opening the air gap magnetic core, can effectively restrain the magnetic core saturation. The electric capacity value of different matching electric capacity is different to the regulation effect that different scope current value changes, consequently the utility model discloses two at least matching electric capacities have still been set up to carry out switching control to it through measurement control module and first change over switch, make the utility model provides an it can be in certain current change within range more stable getting can to this energy taking device.
Drawings
Fig. 1 is a schematic circuit structure diagram of a power supply device of an online monitoring device for a power transmission line provided in an embodiment of the present invention;
fig. 2 is a schematic circuit structure diagram of a power supply device of an online monitoring device for a power transmission line provided in the second embodiment.
Wherein: 1. the energy-taking magnetic core comprises an energy-taking magnetic core, 10 secondary windings, 2 matching capacitors, 3 a measurement control module, 31 a first change-over switch, 32 a second change-over switch, 4 a transformer, 5 a standby storage battery, 6 Rogowski coils, 7 power transmission cables, 8 a rectifying circuit and 9 online monitoring equipment.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used 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 "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected or detachably connected or integrated; may be mechanically coupled, may be electrically coupled or may be in communication with each other; may be directly connected or indirectly connected through an intermediate, unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The first embodiment is as follows: as shown in fig. 1, a power supply device of an online monitoring device of a power transmission line includes a magnetic core branch, a load branch and a control circuit, the magnetic core branch includes an energy-taking magnetic core 1 and at least two matching capacitors 2 with different capacitance values, the energy-taking magnetic core 1 is an open-air magnetic core, the energy-taking magnetic core 1 is sleeved on a power transmission cable 7, and a secondary winding 10 is wound on the energy-taking magnetic core 1; the control circuit comprises a measurement control module 3 and a first change-over switch 31, the first change-over switch 31 comprises first gears with the same number as that of the matching capacitors 2, the matching capacitors 2 are connected with the secondary winding 10 through the corresponding first gears on the first change-over switch 31, and the measurement control module 3 is used for controlling the first change-over switch 31 to be switched between different first gears according to a current value on the power transmission cable 7 obtained through real-time measurement so as to enable the corresponding matching capacitors 2 to be connected with the energy taking magnetic core 1 in parallel; the load branch comprises a transformer 4 and a rectifying circuit 8, two ends of a primary coil of the transformer 4 are connected with power transmission lines on two sides of the energy-taking magnetic core 1, two ends of a secondary coil of the transformer 4 are connected with the rectifying circuit 8, and an output end of the rectifying circuit 8 is connected with an online monitoring device 9.
The energy-taking magnetic core 1 with the air gap is connected with the matching capacitor 2 in parallel, so that the energy-taking magnetic core 1 and the matching capacitor 2 form a magnetic core branch, the load branch is taken as a whole, the equivalent impedance of the magnetic core branch and the input impedance of the load branch are equivalent to parallel connection, partial current of the power transmission line flows into the load branch, and the output of electric energy is realized. Due to the adjusting effect of the matching capacitor 2, when the current value in the power transmission line is smaller, the equivalent impedance of the magnetic core branch is increased, so that the load branch is divided into more power transmission line currents, namely when the current value of the power transmission line is smaller, the energy taking device provided by the embodiment can also provide electric energy for the load branch, and when the current value in the power transmission line is larger, the magnetic core saturation can be effectively inhibited because the energy taking magnetic core 1 is an open-air magnetic core.
The capacitance values of different matching capacitors 2 have different adjusting effects on the current value changes in different ranges, so in this embodiment, at least two matching capacitors 2 are provided, the corresponding matching capacitors 2 are connected in parallel with the energy-taking magnetic core 1 through the switching action of the first change-over switch 31, the measurement control module 3 is connected with the first change-over switch 31, and the measurement control module 3 controls the switching action of the first change-over switch 31 through the current value on the power transmission cable 7 obtained through real-time measurement. The energy obtaining device provided by the embodiment can obtain energy more stably within a certain current variation range. Wherein, what play measurement function in the measurement control module 3 is the rogowski coil 6, establish the rogowski coil 6 on transmission cable 7, choose the current value that rogowski coil 6 comes measurement transmission line for use, the reaction is sensitive can real-time measurement, and stability is high simultaneously, and life is longer to the installation is convenient.
In consideration of the actual occupied space for installing the matching capacitor 2 and the convenience in operation, the number of the matching capacitors 2 in the present embodiment is three, including the first capacitor, the second capacitor, and the third capacitor. The electric current variation range that different capacitance values adapted is different, and the matching that sets up the electric capacity of three different capacitance values can be more accurate gets can magnetic core 1, makes to get to can be more stable, considers installation space's size simultaneously, and it is comparatively suitable to install three electric capacity.
The matching capacitors 2 in this embodiment are all tunable capacitors. The electric capacity of adjustable capacitor can be adjusted at a less within range to be fixed in a definite capacitance value after the adjustment, select for use adjustable capacitor can further make matching electric capacity 2 more accurate matching and get ability magnetic core 1, make to get to can more stable.
The operation control principle of the energy-taking device provided by the embodiment is described as follows: firstly, a measurement control module 3 measures a real-time current value on a power transmission line, a first switching value, a second switching value and a third switching value which are sequentially increased are arranged in the measurement control module, and then the current value is sequentially compared with the first switching value, the second switching value and the third switching value which are preset in the measurement control module 3, wherein when the measurement control module 3 measures that the current value of the power transmission line is lower than the first switching value, the measurement control module 3 controls a first switch 31 to act so that a first capacitor is connected with an energy taking magnetic core 1 in parallel; when the measurement control module 3 measures that the current value of the power transmission line is higher than the first switching value and lower than the second switching value, the measurement control module 3 controls the first switching switch 31 to act so that the second capacitor is connected with the energy-taking magnetic core 1 in parallel; when the measurement control module 3 measures that the current value of the power transmission line is higher than the second switching value and lower than the third switching value, the measurement control module 3 controls the first switch 31 to operate so that the third capacitor is connected in parallel with the energy-taking magnetic core 1. Therefore, the proper matching capacitor 2 can be selected and connected according to different current value ranges of the power transmission line, so that the energy taking device can stably take energy in a larger current value change range and stably supply power for the online monitoring equipment.
Example two: as shown in fig. 2, the present embodiment provides a power supply device for an online monitoring device of a power transmission line, and the difference between the present embodiment and the foregoing embodiment is as follows: the embodiment further includes a backup battery 5 and a second change-over switch 32, the second change-over switch 32 includes two second gears, the output end of the rectifying circuit 8 is connected with the online monitoring device 9 through one second gear, the output end of the backup battery 5 is connected with the online monitoring device 9 through another second gear, and the second change-over switch 32 is connected with the measurement control module 3 and is used for controlling the second change-over switch 32 to switch between different second gears.
Based on the above distinguishing technical features, the energy obtaining device provided by this embodiment can control the power supply of the on-line monitoring device by the load branch or the backup battery 5 through the switching action of the second change-over switch 32, and has more selectivity, and can timely switch to the power supply state of the backup battery 5 when the current value of the power transmission line is too large or too small, thereby avoiding that the on-line monitoring device 9 cannot work when the power is cut off.
The operation control principle of the energy-taking device provided by the embodiment is described as follows: the measurement control module 3 is internally provided with a first threshold value and a second threshold value, when the measurement control module 3 measures that the current value of the power transmission line is lower than the first threshold value or higher than the second threshold value, the measurement control module 3 controls the second change-over switch 32 to operate so as to enable the standby storage battery 5 to be conducted with the online monitoring equipment, when the measurement control module 3 measures that the current value of the power transmission line is between the first threshold value and the second threshold value, the measurement control module 3 controls the change-over switch to operate so as to enable the output end of the rectifying circuit to be conducted with the online monitoring equipment, and at the moment, the control principle in the first embodiment is adopted to control the magnetic core path and the load path. Therefore, when the current value of the power transmission line is too small to enable the energy taking magnetic core 1 to obtain electric energy or when the current value of the power transmission line is too large to cause the energy taking magnetic core 1 to be saturated, the second change-over switch 32 is controlled to act through the measurement control module 3 to complete switching, the standby storage battery 5 is used for supplying power temporarily, and the power supply stability of the online monitoring equipment and the self safety of the energy taking magnetic core 1 are guaranteed.
The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any person skilled in the art can make changes or modifications within the scope of the present invention.
Claims (7)
1. The utility model provides a power supply unit of transmission line on-line monitoring equipment which characterized in that: the energy-taking magnetic core comprises a magnetic core branch, a load branch and a control circuit, wherein the magnetic core branch comprises an energy-taking magnetic core (1) and at least two matching capacitors (2) with different capacitance values, the energy-taking magnetic core (1) is an open-air magnetic core, the energy-taking magnetic core (1) is sleeved on a power transmission cable (7), and a secondary winding (10) is wound on the energy-taking magnetic core (1);
the control circuit comprises a measurement control module (3) and a first change-over switch (31), the first change-over switch (31) comprises first gears with the same number as that of the matching capacitors (2), the matching capacitors (2) are connected with the secondary winding (10) through the corresponding first gears on the first change-over switch (31), and the measurement control module (3) is used for controlling the first change-over switch (31) to be switched between different first gears according to a current value on a power transmission cable (7) obtained through real-time measurement so that the corresponding matching capacitors (2) are connected with the energy taking magnetic core (1) in parallel;
the load branch circuit comprises a transformer (4) and a rectifying circuit (8), two ends of a primary coil of the transformer (4) are connected with power transmission cables (7) on two sides of the energy taking magnetic core (1), two ends of a secondary coil of the transformer (4) are connected with the rectifying circuit (8), and an output end of the rectifying circuit (8) is connected with an online monitoring device (9).
2. The power supply device of the on-line monitoring equipment of the power transmission line according to claim 1, characterized in that: the matching capacitor (2) comprises a first capacitor, a second capacitor and a third capacitor.
3. The power supply device of the on-line monitoring equipment of the power transmission line according to claim 2, characterized in that: a first switching value, a second switching value and a third switching value which are increased in sequence are arranged in the measurement control module (3), and when the measurement control module (3) measures that the current value of the power transmission line is lower than the first current value, the measurement control module (3) controls the first switching switch (31) to act to enable the first capacitor and the energy-taking magnetic core (1) to be connected in parallel;
when the measurement control module (3) measures that the current value of the power transmission line is higher than a first current value and lower than a second current value, the measurement control module (3) controls a first change-over switch (31) to act so that a second capacitor is connected with the energy taking magnetic core (1) in parallel;
when the measurement control module (3) measures that the current value of the power transmission line is higher than the second current value and lower than the third current value, the measurement control module (3) controls the first change-over switch (31) to act so that the third capacitor is connected with the energy taking magnetic core (1) in parallel.
4. The power supply device of the on-line monitoring equipment of the power transmission line according to claim 1, characterized in that: the measurement control module (3) comprises a Rogowski coil (6), and the Rogowski coil (6) is sleeved on the power transmission cable (7).
5. The power supply device of the on-line monitoring equipment of the power transmission line according to claim 1, characterized in that: the matching capacitors (2) are all adjustable capacitors.
6. The power supply device of the on-line monitoring equipment of the power transmission line according to any one of claims 1 to 5, characterized in that: still include reserve battery (5) and second change over switch (32), second change over switch (32) include two second gears, the output of rectifier circuit (8) is connected with on-line monitoring equipment (9) through a second gear, the output of reserve battery (5) is connected with on-line monitoring equipment (9) through another second gear, second change over switch (32) with measurement control module (3) are connected, are used for control second change over switch (32) switch between the second gear of difference.
7. The power supply device of the on-line monitoring equipment of the power transmission line according to claim 6, characterized in that: a first threshold value and a second threshold value are further arranged in the measurement control module (3), and when the measurement control module (3) measures that the current value of the power transmission line is lower than the first threshold value or higher than the second threshold value, the measurement control module (3) controls the second change-over switch (32) to act so as to enable the standby storage battery (5) to be conducted with the online monitoring equipment (9);
when the measurement control module (3) measures that the current value of the power transmission line is between a first threshold value and a second threshold value, the measurement control module (3) controls the change-over switch to act so that the output end of the rectifying circuit (8) is conducted with the online monitoring equipment (9).
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| CN202022983558.XU CN214100984U (en) | 2020-12-10 | 2020-12-10 | Power supply device of on-line monitoring equipment of power transmission line |
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| CN202022983558.XU CN214100984U (en) | 2020-12-10 | 2020-12-10 | Power supply device of on-line monitoring equipment of power transmission line |
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| CN202022983558.XU Active CN214100984U (en) | 2020-12-10 | 2020-12-10 | Power supply device of on-line monitoring equipment of power transmission line |
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