CN217879400U - Current and voltage sensor and self-power-taking combined device - Google Patents
Current and voltage sensor and self-power-taking combined device Download PDFInfo
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- CN217879400U CN217879400U CN202221719598.6U CN202221719598U CN217879400U CN 217879400 U CN217879400 U CN 217879400U CN 202221719598 U CN202221719598 U CN 202221719598U CN 217879400 U CN217879400 U CN 217879400U
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Abstract
The utility model provides a current, voltage sensor reaches from power take-off combined device, which comprises an outer shell, the shell includes epitheca and the main casing body, the internal phase voltage sensor that is equipped with of main casing, the electric capacity is got to the high pressure, the circuit board, be equipped with the Rogowski coil sensor in the epitheca, the phase voltage sensor, the high pressure is got the external joint of electric capacity and is stretched out from the both sides of the main casing body respectively, be connected to high-voltage overhead transmission line's high-voltage bus, be equipped with integrating circuit on the circuit board, bleeder circuit and high pressure are got the electric protection circuit, the Rogowski coil sensor other end is connected with the integrating circuit electricity, the line end and the bleeder circuit electricity of phase voltage sensor are connected, the line end and the high pressure that get the electric capacity are got the electric protection circuit and are connected. The utility model discloses possess simultaneously that the line is simple, simple structure, security performance are high, small, characteristics such as with low costs to reach phase sequence current measurement, phase sequence voltage measurement and safe power supply protection's purpose.
Description
Technical Field
The utility model relates to an electron electric power technical field, concretely relates to electric current, voltage sensor and get electric composite set certainly.
Background
Common high-voltage electricity taking methods include current transformer electricity taking and voltage transformer electricity taking. The current transformer needs to be connected with impedance in series at the secondary side of the transformer to obtain voltage and electric energy, and the voltage on the impedance is in direct proportion to primary current, so that the voltage stabilization of a power supply based on the current transformer electricity-taking technology is difficult to realize. The voltage transformer mainly comprises an electromagnetic voltage transformer and a capacitance voltage transformer, the electromagnetic voltage transformer is large in size, inconvenient to install and high in cost, and the traditional outdoor on-column circuit breaker gets electricity and uses the electromagnetic transformer, so that secondary short circuit and explosion accidents frequently occur, and the voltage transformer becomes one of main accident points of a distribution network. The capacitance-voltage transformer mainly comprises a capacitance voltage divider and a medium voltage transformer, the voltage is extracted by a series capacitor, and then the voltage is transformed by the transformer to be used as a voltage source for metering, relay protection and the like, a power taking circuit can affect the capacitance voltage division ratio, the measurement accuracy is influenced, the loading capacity is limited, the power taking capacity is limited, and the safety is low.
The current high-voltage intelligent power grid realizes phase sequence current and phase sequence voltage measurement through a power distribution switch monitoring terminal, the phase sequence current is measured by a current transformer consisting of an iron core and a winding according to the electromagnetic induction principle, the iron core transformer has large volume, serious heating and high cost, a closed loop of induced current in an open transformer is disconnected, the magnetic circuit efficiency at the disconnected part is reduced, and the metering error is large; the electromagnetic mutual inductor is adopted for phase sequence voltage, the insulation difficulty is high, the volume, the quality and the cost of the mutual inductor are improved due to insulation, the dynamic range is small, the problems of magnetic saturation, ferromagnetic resonance and the like inevitably exist, particularly, a coil can be burnt out after short circuit, and the anti-interference capability and the stability are poor.
In addition, when the problems of phase sequence current measurement, phase sequence voltage measurement and power supply are solved, three different devices need to be installed separately, integration is low, safety is low, installation and use are inconvenient, space utilization rate is low, and cost is too high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of line is simple, simple structure, security performance height, small, with low costs electric current, voltage sensor and get electric composite set certainly, and this composite set has the high pressure through the inner circuit integration to get electric protection circuit, integrating circuit, bleeder circuit, has realized purposes such as phase sequence current measurement, phase sequence voltage measurement and safe power supply protection simultaneously.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
a current and voltage sensor and self-powered combination device, comprising: the high-voltage overhead power transmission line comprises a shell, wherein the shell is sleeved on the high-voltage overhead power transmission line and comprises an upper shell and a main shell, the upper shell and the main shell are made of insulating materials, the upper shell is connected with the main shell through a hinge shaft, a phase voltage sensor, a high-voltage power-taking capacitor and a circuit board are arranged in the main shell, a Rogowski coil sensor is arranged in the upper shell, one end of the Rogowski coil sensor surrounds a high-voltage bus, the other end of the Rogowski coil sensor is electrically connected with the circuit board, external connectors of the phase voltage sensor and the high-voltage power-taking capacitor extend out of two sides of the main shell respectively and are connected to the high-voltage bus of the high-voltage overhead power transmission line, the main shell is provided with a positioning groove, the circuit board is inserted into the positioning groove for positioning, and line ends of the phase voltage sensor and the high-voltage power-taking capacitor are electrically connected with the circuit board respectively;
the integrated circuit is characterized in that an integrating circuit, a voltage dividing circuit and a high-voltage power-taking protection circuit are arranged on the circuit board, the other end of the Rogowski coil sensor is electrically connected with the integrating circuit, the line end of the phase voltage sensor is electrically connected with the voltage dividing circuit, and the line end of the high-voltage power-taking capacitor is connected with the high-voltage power-taking protection circuit.
The further scheme is that a through hole is formed in two ends of the upper shell, and a cable accommodating groove with the same penetrating direction as the through hole is formed in the inner side of the upper shell.
According to a further scheme, the high-voltage power-taking protection circuit comprises a gas discharge tube, an isolation transformer, a voltage-dividing capacitor, a matching reactor and an alternating current-direct current conversion power supply module, wherein an external connector of the high-voltage power-taking capacitor extends out of one side of the main shell and is connected with one side of the high-voltage bus, the line end of the high-voltage power-taking capacitor is connected with one end of the gas discharge tube, and the other end of the gas discharge tube is connected with the other side of the high-voltage bus; a primary side winding of the isolation transformer is connected with the gas discharge tube in parallel, and a secondary side winding of the isolation transformer is connected with the voltage division capacitor in parallel; one end of the matching reactor is connected with one end of the voltage-dividing capacitor, and the other end of the matching reactor is connected with an input side power pin of the alternating current-direct current conversion power supply module; and the ground pin at the input side of the AC-DC conversion power supply module is connected with the other end of the voltage division capacitor, and the output side of the AC-DC conversion power supply module outputs a power supply signal.
The further scheme is that an aviation plug is connected to the lower portion of the main shell, and the integrating circuit, the voltage dividing circuit and the high-voltage power-taking protection circuit on the circuit board are respectively connected with a signal output line and connected with the aviation plug through the signal output line.
In a further scheme, the aviation plug is externally sleeved with a silicon rubber insulating sleeve.
In a further scheme, the shell is formed by plastic molding or poured by epoxy resin.
In a further scheme, the rogowski coil sensor comprises a plug-in rogowski coil, one end of the rogowski coil is used for surrounding a high-voltage bus, and the other end of the rogowski coil is provided with two signal output lines which are used for being connected with the circuit board.
In a further scheme, an external connector of the phase voltage sensor is a phase sequence voltage high-voltage flexible wire; the external connector of the high-voltage power-taking capacitor is a power-taking capacitor high-voltage flexible wire.
Therefore, the utility model relates to an integrated device that voltage magnitude was gathered, the electric current magnitude was gathered and was got electricity power supply and protect function certainly has been gathered to a section, is applicable to outdoor overhead transmission line and goes up, can use with equipment cooperation such as column switch, feeder terminal, high-voltage electric meter, has characteristics such as small, the security performance is high, light in weight, the integrated level is high, the simple installation, low power dissipation. Wherein, the high-voltage electricity-taking capacitor is a high-voltage ceramic capacitor of 5nF/10 kV; the primary side voltage of the isolation transformer is determined by a voltage-dividing capacitor and a matching reactor on the secondary side, and the gas discharge tube plays a role in overvoltage protection; the secondary winding of the isolation transformer outputs alternating current, the alternating current flows into the alternating current-direct current conversion power supply module through the matching reactor, and the alternating current is converted into direct current with stable voltage; and the direct current output by the direct current conversion power supply module flows into a load to supply power.
Furthermore, a voltage-dividing capacitor and a matching reactor are arranged on the side of a secondary winding of the isolation transformer, the requirement on the voltage-withstand grade of the voltage-dividing capacitor and the matching reactor in the traditional capacitor voltage-dividing electricity-taking loop is lowered, the size of an electricity-taking device is reduced, and the safety is improved.
Further, the phase current adopts a Rogowski coil sensor mode to obtain a current signal; the sensor is designed completely, and the precision change meets the requirement within the temperature range of minus 40 to 70 ℃.
Further, the electricity taking mode is obtained by pure ceramic capacitor voltage division; an automatic protection function is arranged in the power taking loop; the passive devices are adopted, and the service life can be equal to that of the column.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic structural view of a current and voltage sensor and a self-powered combination device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second angle in an embodiment of a current and voltage sensor and a self-powered device according to the present invention.
Fig. 3 is a schematic structural diagram of a third angle in an embodiment of a current and voltage sensor and a self-powered device according to the present invention.
Fig. 4 is a schematic structural diagram of a fourth angle in an embodiment of the current and voltage sensor and the self-powered combined device of the present invention.
Fig. 5 is a cross-sectional view of an embodiment of the current and voltage sensor and self-powered combination device of the present invention.
Fig. 6 is a schematic circuit diagram of a high-voltage power-taking protection circuit in an embodiment of a current and voltage sensor and a self power-taking combination device of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention will be combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 to 6, the utility model relates to a current, voltage sensor and from getting electric composite set, include: the high-voltage overhead power transmission line comprises a shell, wherein the shell is sleeved on the high-voltage overhead power transmission line and comprises an upper shell 1 and a main shell 2, the upper shell 1 and the main shell are made of insulating materials, a phase voltage sensor 31, a high-voltage power taking capacitor 41 and a circuit board 30 are arranged in the main shell 2, a Rogowski coil sensor 11 is arranged in the upper shell 1, one end of the Rogowski coil sensor 11 surrounds the high-voltage bus, the other end of the Rogowski coil sensor 11 is electrically connected with the circuit board 30, external connectors of the phase voltage sensor 31 and the high-voltage power taking capacitor 41 respectively extend out of two sides of the main shell 2 and are connected to the high-voltage bus of the high-voltage overhead power transmission line, the main shell 2 is provided with a positioning groove, the circuit board 30 is inserted into the positioning groove for positioning, and line ends of the phase voltage sensor 31 and the high-voltage power taking capacitor 41 are respectively electrically connected with the circuit board 30;
the circuit board 30 is provided with an integrating circuit, a voltage dividing circuit and a high-voltage power-taking protection circuit, the other end of the rogowski coil sensor 11 is electrically connected with the integrating circuit, the line end of the phase voltage sensor 31 is electrically connected with the voltage dividing circuit, and the line end of the high-voltage power-taking capacitor 41 is connected with the high-voltage power-taking protection circuit.
Wherein, a through-hole 5 that runs through is seted up at epitheca 1 both ends, and 1 inboard is equipped with the cable holding tank that runs through the direction unanimity with through-hole 5.
In this embodiment, the high-voltage power-taking protection circuit includes a gas discharge tube GDT, an isolation transformer TR1, a voltage-dividing capacitor C1, a matching reactor L1, and an ac-dc conversion power module 100, an external connector of a high-voltage power-taking capacitor 41 (C1) extends from one side of the main housing 2 to connect one side of a high-voltage bus, a line end of the high-voltage power-taking capacitor 41 is connected with one end of the gas discharge tube GDT, and the other end of the gas discharge tube GDT is connected with the other side of the high-voltage bus; a primary side winding of the isolation transformer TR1 is connected with the gas discharge tube GDT in parallel, and a secondary side winding of the isolation transformer TR1 is connected with the voltage division capacitor C1 in parallel; one end of the matching reactor L1 is connected with one end of the voltage-dividing capacitor C1, and the other end of the matching reactor L1 is connected with an input side power pin of the AC-DC conversion power supply module 100; an input-side ground pin of the ac-dc conversion power supply module 100 is connected to the other end of the voltage-dividing capacitor C1, and an output side of the ac-dc conversion power supply module 100 outputs a power supply signal to the load 200.
In this embodiment, an aviation plug 40 is connected to the lower portion of the main housing 2, and the integrating circuit, the voltage dividing circuit and the high-voltage power-taking protection circuit on the circuit board 30 are respectively connected to a signal output line and connected to the aviation plug 40 through the signal output line.
Wherein, the outer cover of aviation plug 40 is equipped with a silicon rubber insulating bush 41, and aviation plug 40 external cable interface 8.
In the present embodiment, the upper housing 1 and the main housing 2 are connected by a hinge shaft 6, wherein the back surfaces of the upper housing 1 and the main housing 2 are connected by the hinge shaft 6, the front surfaces of the upper housing 1 and the main housing 2 are connected by bolts, such as locking screws M6 (7), and the main housing 2 is fixedly connected by locking screws 4-M5 (9). The upper shell 1 is connected with the main shell 2 through screws and can be turned over, and after the upper shell 1 is turned over and covers the main shell 2, the high-voltage bus and the Rogowski coil are partially covered with a cage outside the high-voltage bus and the Rogowski coil, so that the closed protection effect is achieved.
Preferably, the housing is molded from plastic or cast from epoxy.
In this embodiment, the rogowski coil sensor 11 includes a plug-in rogowski coil, one end of which is used to surround the high-voltage bus, and the other end of which is provided with two signal output lines for connecting the circuit board 30.
In the present embodiment, the external connection terminal of the phase voltage sensor 31 is a phase-sequence voltage high-voltage cord 3; the external connection of the high voltage capacitor 41 is a capacitor high voltage flexible wire 4.
During phase sequence voltage measurement, the phase voltage sensor 31 and the voltage dividing circuit are connected in series to form a phase sequence voltage measurement module, 10KV voltage of the high-voltage bus is subjected to voltage reduction and stabilization by the phase sequence voltage measurement module and then outputs a voltage signal in a certain power value and voltage value mode, the voltage signal is transmitted to the aviation plug 40 through a signal output line, and a pin end of the aviation plug 40 is connected with a load, so that the phase sequence voltage measurement is realized.
When electricity is taken, the high-voltage electricity taking capacitor 41 is used as an electricity taking capacitor, the high-voltage end of the capacitor is connected with the 10KV high-voltage bus, and the low-voltage end of the capacitor is connected with the high-voltage electricity taking protection circuit on the circuit board 30 in series. The low-voltage end of the high-voltage power-taking capacitor 41 is connected in series with the isolation transformer TR1 therein. The high voltage of 10KV voltage of the high-voltage bus is divided by the high-voltage electricity-taking capacitor 41 and then transformed into low voltage through the isolation transformer TR1, the voltage of the primary side of the isolation transformer TR1 is determined by the voltage-dividing capacitor C1 of the secondary side and the matching reactor L1, and the gas discharge tube GDT plays a role in overvoltage protection; alternating current is output by a secondary winding of the isolation transformer TR1, flows into the alternating current-direct current conversion power supply module 100 through the matching reactor L1, and is converted into direct current with stable voltage; the direct current output by the direct current conversion power supply module flows into a load to supply power, namely the direct current is transmitted to the aviation plug 40 through a signal output line, and a pin end of the aviation plug 40 is connected with the load, so that the function of providing 220V alternating current for the load is realized.
Therefore, the utility model relates to an integrated device that voltage magnitude was gathered, the electric current magnitude was gathered and was got electricity power supply and protect function certainly has been gathered to a section, is applicable to outdoor overhead transmission line and goes up, can use with equipment cooperation such as column switch, feeder terminal, high-voltage electric meter, has characteristics such as small, the security performance is high, light in weight, the integrated level is high, the simple installation, low power dissipation. Wherein, the high-voltage electricity-taking capacitor 41 is a high-voltage ceramic capacitor of 5nF/10 kV; the primary side voltage of the isolation transformer TR1 is determined by a voltage-dividing capacitor C1 and a matching reactor L1 on the secondary side, and the gas discharge tube GDT plays a role in overvoltage protection; the secondary winding of the isolation transformer TR1 outputs alternating current, and the alternating current flows into the alternating current-direct current conversion power supply module 100 through the matching reactor L1 to be converted into direct current with stable voltage; and the direct current output by the direct current conversion power supply module flows into a load to supply power.
Furthermore, a voltage-dividing capacitor C1 and a matching reactor L1 are arranged on the side of a secondary winding of the isolation transformer TR1, the requirement of the traditional capacitor voltage-dividing electricity-taking loop on the voltage-withstanding grade of the voltage-dividing capacitor C1 and the matching reactor L1 is lowered, the size of an electricity-taking device is reduced, and the safety is improved.
Further, the phase current adopts a Rogowski coil sensor 11 mode to obtain a current signal; the sensor is designed completely, and the precision change meets the requirement within the temperature range of minus 40 to 70 ℃.
Further, the electricity taking mode is obtained by pure ceramic capacitance voltage division; an automatic protection function is arranged in the electricity taking loop; the passive devices are adopted, and the service life can be equal to that of the column.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (8)
1. The utility model provides a current, voltage sensor and get electric composite set certainly which characterized in that includes:
the shell is sleeved on the high-voltage overhead transmission line and comprises an upper shell made of an insulating material and a main shell made of outdoor epoxy resin, the upper shell and the main shell are connected through a hinge shaft, a phase voltage sensor, a high-voltage power-taking capacitor and a circuit board are arranged in the main shell, a Rogowski coil sensor is arranged in the upper shell, one end of the Rogowski coil sensor surrounds a high-voltage bus, the other end of the Rogowski coil sensor is electrically connected with the circuit board, external connectors of the phase voltage sensor and the high-voltage power-taking capacitor extend out of two sides of the main shell respectively and are connected to the high-voltage bus of the high-voltage transmission line, a positioning groove is formed in the main shell, the circuit board is inserted into the positioning groove to be positioned, and the overhead line ends of the phase voltage sensor and the high-voltage power-taking capacitor are electrically connected with the circuit board respectively;
the Rogowski coil sensor comprises a circuit board, a Rogowski coil sensor and a phase voltage sensor, wherein the circuit board is provided with an integrating circuit, a voltage dividing circuit and a high-voltage power-taking protection circuit, the other end of the Rogowski coil sensor is electrically connected with the integrating circuit, the line end of the phase voltage sensor is electrically connected with the voltage dividing circuit, and the line end of the high-voltage power-taking capacitor is connected with the high-voltage power-taking protection circuit.
2. The combination of claim 1, wherein:
a through hole is formed in each of two ends of the upper shell in a penetrating mode, and a cable accommodating groove with the same penetrating direction as the through hole is formed in the inner side of the upper shell.
3. The combination of claim 1, wherein:
the high-voltage power-taking protection circuit comprises a gas discharge tube, an isolation transformer, a voltage-dividing capacitor, a matching reactor and an alternating current-direct current conversion power supply module, wherein an external connector of the high-voltage power-taking capacitor extends out of one side of the main shell and is connected with one side of the high-voltage bus, the line end of the high-voltage power-taking capacitor is connected with one end of the gas discharge tube, and the other end of the gas discharge tube is connected with the other side of the high-voltage bus; a primary side winding of the isolation transformer is connected with the gas discharge tube in parallel, and a secondary side winding of the isolation transformer is connected with the voltage division capacitor in parallel; one end of the matching reactor is connected with one end of the voltage-dividing capacitor, and the other end of the matching reactor is connected with an input side power pin of the alternating current-direct current conversion power supply module; and the ground pin of the input side of the AC-DC conversion power supply module is connected with the other end of the voltage dividing capacitor, and the output side of the AC-DC conversion power supply module outputs a power supply signal.
4. The combination of claim 3, wherein:
the main casing body below is connected with an aviation plug, on the circuit board integrator circuit, bleeder circuit and high pressure get the electric protection circuit and are connected with signal output line respectively, and pass through signal output line with aviation plug connects.
5. The combination of claim 4, wherein:
the aviation plug is sleeved with a silicon rubber insulating sleeve.
6. The combination of any one of claims 1 to 5, wherein:
the shell is formed by plastic molding or poured by epoxy resin.
7. The combination of any one of claims 1 to 5, wherein:
the Rogowski coil sensor comprises a plug-in Rogowski coil, one end of the Rogowski coil is used for surrounding a high-voltage bus, and the other end of the Rogowski coil is provided with two signal output lines which are used for being connected with the circuit board.
8. The combination of any one of claims 1 to 5, wherein:
the external joint of the phase voltage sensor is a phase sequence voltage high-voltage flexible wire; the external connector of the high-voltage power-taking capacitor is a power-taking capacitor high-voltage flexible wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221719598.6U CN217879400U (en) | 2022-07-05 | 2022-07-05 | Current and voltage sensor and self-power-taking combined device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221719598.6U CN217879400U (en) | 2022-07-05 | 2022-07-05 | Current and voltage sensor and self-power-taking combined device |
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| Publication Number | Publication Date |
|---|---|
| CN217879400U true CN217879400U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221719598.6U Active CN217879400U (en) | 2022-07-05 | 2022-07-05 | Current and voltage sensor and self-power-taking combined device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117572060A (en) * | 2024-01-17 | 2024-02-20 | 国网湖北省电力有限公司经济技术研究院 | Non-contact passive distributed cable current measuring device and measuring method |
-
2022
- 2022-07-05 CN CN202221719598.6U patent/CN217879400U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117572060A (en) * | 2024-01-17 | 2024-02-20 | 国网湖北省电力有限公司经济技术研究院 | Non-contact passive distributed cable current measuring device and measuring method |
| CN117572060B (en) * | 2024-01-17 | 2024-04-09 | 国网湖北省电力有限公司经济技术研究院 | Non-contact passive distributed cable current measuring device and measuring method |
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