CN216929689U - Capacitive high-voltage self-power-taking power supply and measurement integrated device - Google Patents
Capacitive high-voltage self-power-taking power supply and measurement integrated device Download PDFInfo
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Abstract
The invention discloses a capacitance type high-voltage self-powered power supply and measurement integrated device, which comprises a high-voltage power-taking capacitor C, wherein one end of the high-voltage power-taking capacitor C is connected with a high-voltage bus, the other end of the high-voltage power-taking capacitor C is connected with a primary side winding of a transformer T, the voltage of the high-voltage power-taking capacitor C is reduced by the transformer T, low-voltage alternating current is obtained, the low-voltage alternating current is subjected to ACDC conversion by a power-taking control plate with ACDC conversion, which is connected with a secondary side winding of the transformer T, 24V direct current is obtained, a high-voltage fuse is connected between the high-voltage power-taking capacitor C and the high-voltage bus, the high-voltage fuse is connected with one end of a voltage-dividing capacitor C1 between the high-voltage power-taking capacitor C, the other end of the voltage-dividing capacitor C1 is connected with one end of the voltage-dividing capacitor C2, the other end of the voltage-dividing capacitor C2 is grounded with the negative electrode of the primary side winding of the transformer T, a low-voltage transformer B is connected in parallel with FTU equipment on a 2, by measuring the voltage value output by the voltage dividing capacitor C2, the phase voltage on the high-voltage bus can be obtained.
Description
Technical Field
The invention relates to a self-powered device, in particular to a capacitive high-voltage self-powered power supply and measurement integrated device.
Background
With the continuous improvement of the grade and the capacity of a high-voltage transmission line, the short-circuit current in the line is larger and larger, so that the conventional electromagnetic voltage transformer is easy to generate safety accidents such as explosion and the like due to factors such as ferromagnetic resonance, magnetic saturation and the like, the normal and orderly operation of the high-voltage line is seriously influenced, and the long-term development of the health of an intelligent power grid is hindered, but the safe operation of a measuring and protecting device is vital to the safe production and the stable operation of the whole power system, so that the high-voltage side line energy-taking field research has important practical value; the current common high-voltage online power supply modes comprise an electromagnetic voltage transformer, a current transformer, a storage battery, laser, solar energy and the like, and have advantages and disadvantages.
The existing switch is basically complete set of primary and secondary equipment, relates to a plurality of manufacturers and a plurality of equipment interfaces, and often has the problems of non-uniform interfaces, no expansibility, complex installation and debugging, difficult division of responsibility and the like; in addition, the electromagnetic PT is not easy to integrate, the installation is complex, and ferromagnetic resonance is easy to generate.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the capacitive high-voltage self-power-taking and measurement integrated device with low power consumption and resonance resistance is provided.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a capacitive high-voltage self-power-taking power supply and measurement integrated device comprises a high-voltage power-taking capacitor C, wherein one end of the high-voltage power-taking capacitor C is connected with a high-voltage bus, high-voltage power taking is carried out in an electric field existing around the high-voltage bus, the other end of the high-voltage power-taking capacitor C is connected with a primary side winding of a transformer T, high-voltage alternating current obtained by the high-voltage power-taking capacitor C is subjected to voltage reduction through the transformer T, low-voltage alternating current is obtained after voltage reduction, and ACDC conversion is carried out on the low-voltage alternating current through an energy-taking control panel converted by ACDC connected with a secondary side winding of the transformer T, so that 24V direct current is obtained.
Get and to be provided with EMC protection module, rectifier module, voltage stabilizing module and output detection module on the energy control board, be provided with the ACDC conversion in the rectifier module, EMC protection module one end with high voltage transformer T secondary side is connected, the other end with rectifier module's input is connected, rectifier module will warp alternating current after high voltage transformer T steps down becomes the direct current, voltage stabilizing module protects and the voltage stabilizing to the direct current, at last by output detection module exports.
The transformer T is characterized in that overvoltage protection is further arranged at the primary side winding of the transformer T, the overvoltage protection is high-voltage protection, and a high-voltage piezoresistor is adopted to protect instantaneous overvoltage so as to ensure that the transformer is not damaged due to overvoltage.
A power supply protection is arranged between a secondary side winding of the transformer T and the ACDC conversion board, the power supply protection is low-voltage rectification protection, a TVS tube and a semiconductor discharge tube are adopted to protect a low-voltage side, a radiator is connected to the TVS tube, and when the voltage of an energy-taking power supply is high, the TVS tube can be conducted to generate heat, redundant power consumption is consumed, and the dynamic balance of power taking and load is kept.
The high-voltage power taking capacitor C and the high-voltage bus are connected with the high-voltage fuse, so that the equipment is ensured to be separated from a power supply line under the extreme condition, the normal operation of the line is ensured, and the line grounding of the equipment under the extreme condition is avoided.
The high voltage fuse with the high voltage is got and is connected with voltage divider capacitor C1's one end between the electric capacity C, voltage divider capacitor C1's the other end is connected with voltage divider capacitor C2's one end, voltage divider capacitor C2's the other end with transformer T's primary side winding's negative pole is ground connection together, voltage divider capacitor C2 is last to have parallelly connected low-voltage transformer B, low-voltage transformer B's the other end and FTU equipment are connected, through measuring the voltage value of output on the voltage divider capacitor C2, according to the high voltage is got electric capacity ratio between the electric capacity C with voltage divider capacitor C2, can obtain the looks voltage on the high voltage bus.
C is a high-voltage electricity-taking capacitor, a 2500p-6600p high-voltage ceramic capacitor is selected, the high-voltage ceramic capacitor has good impact resistance, the temperature coefficient is good, and the temperature drift is small in a high-temperature and low-temperature state; c1 is a ceramic capacitor of 620pf, C2 is a ceramic capacitor of 1.9uf, C, C1 and C2 are integrally cast and molded; the upper end is provided with a high-voltage fuse for protection and protection.
And a connecting cable with low capacitance and double shielding layers is adopted as a cable between the voltage dividing capacitor C2 and the FTU equipment.
The invention has the following positive beneficial effects:
1. the invention utilizes the capacitor to obtain energy of the capacitive power supply, is a 10kV power supply utilizing the principle of capacitance voltage reduction and energy obtaining, can meet the power supply requirement of a secondary fusion pole-mounted switch intelligent controller, meets the integrated design requirement of power grid equipment, and has the characteristics of low power consumption, resonance resistance, safety and reliability.
2. In the invention, the high-voltage electricity taking capacitor C is used for taking electricity at high voltage from an electric field around a high-voltage bus, so that the problems of interface, expansibility, complex installation and debugging, responsibility division and the like are avoided; ferromagnetic resonance of the electromagnetic PT is reduced, and the overall reliability and economy of the equipment are improved.
3. The invention relates to a high-voltage energy-taking device, wherein a primary capacitor and a transformer are separated from rear-stage electronic equipment, and a high-voltage fuse is additionally arranged on the side of the high-voltage capacitor, so that the line grounding of the equipment under the extreme condition is avoided.
4. The high-voltage bus voltage measuring device has the functions of electricity taking and voltage measuring, and can obtain the phase voltage on the high-voltage bus according to the capacity ratio between the high-voltage electricity taking capacitor C and the voltage dividing capacitor C2 by measuring the voltage value output by the voltage dividing capacitor C2.
5. The electronic transformer is manufactured by utilizing a capacitance voltage division mode, the precision change caused by the capacitance parameter change is small, the power consumption is low, the size is small, the weight is light, the insulating property is good, and the elements are the same, so that the voltage division on the low-voltage side is stable under the condition that the capacitance is properly selected, and the problems of ferromagnetic resonance and the like can be avoided.
6. According to the invention, the high-voltage protection adopts a high-voltage piezoresistor, and the low-voltage protection adopts a TVS (transient voltage suppressor) and a semiconductor discharge tube, so that overvoltage and interference caused by overvoltage or other conditions can be prevented; and the capacitor adopts a single ceramic capacitor for electricity taking, and the ceramic capacitor has high voltage resistance, lightning impulse resistance and long service life.
Drawings
FIG. 1 is a schematic circuit diagram of a capacitive high-voltage self-powered power supply and measurement integrated device according to the present invention;
FIG. 2 is a high voltage protection circuit diagram of the present invention;
fig. 3 is a circuit diagram of the low-voltage rectification protection circuit in the invention.
Detailed Description
The invention will be further explained and explained with reference to the accompanying drawings, fig. 1, fig. 2, fig. 3 and the specific embodiments:
in the figure: w-high voltage bus, A-energy-taking control board and FU-fuse
Example (b): a capacitive high-voltage self-powered power supply and measurement integrated device comprises a high-voltage power-taking capacitor C, wherein one end of the high-voltage power-taking capacitor C is connected with a high-voltage bus, high-voltage power taking is carried out in an electric field existing around the high-voltage bus, the other end of the high-voltage power-taking capacitor C is connected with a primary side winding of a transformer T, high-voltage alternating current obtained through the high-voltage power-taking capacitor C is subjected to voltage reduction through the transformer T, low-voltage alternating current is obtained after voltage reduction, and ACDC conversion is carried out on the low-voltage alternating current through an energy-taking control plate converted by ACDC connected with a secondary side winding of the transformer T to obtain 24V direct current.
The energy taking control panel is provided with an EMC protection module, a rectification module, a voltage stabilizing module and an output detection module, the rectification module is internally provided with ACDC conversion, one end of the EMC protection module is connected with the secondary side of the high-voltage transformer T, the other end of the EMC protection module is connected with the input end of the rectification module, the rectification module converts alternating current after being reduced by the high-voltage transformer T into direct current, and the voltage stabilizing module protects and stabilizes the direct current and finally outputs the direct current through the output detection module.
The primary side winding of the transformer T is also provided with overvoltage protection, the overvoltage protection is high-voltage protection, and a high-voltage piezoresistor is adopted to protect instantaneous overvoltage so as to ensure that the transformer is not damaged due to overvoltage.
The power protection is arranged between the secondary side winding of the transformer T and the ACDC conversion board, the power protection is low-voltage rectification protection, a TVS tube and a semiconductor discharge tube are adopted to protect the low-voltage side, a radiator is connected to the TVS tube, when the voltage of an energy-taking power supply is high, the TVS tube can be conducted to generate heat, redundant power consumption is consumed, and dynamic balance of power taking and load is kept.
The energy-taking mode in the device is a constant power mode, namely, the function of taking out, no matter how large the load is, the taken out power is constant, when the external load is smaller, the circuit is designed with consumed power, a TVS (transient voltage suppressor) tube is adopted for voltage stabilization, and the radiating fins are designed for integrated heat dissipation to achieve heat balance.
Meanwhile, during a high-voltage test, the high-voltage protection circuit can bear a 48kV voltage test to protect the transformer and low-voltage equipment.
A high-voltage fuse is connected between the high-voltage power-taking capacitor C and the high-voltage bus, and line grounding of the equipment under the extreme condition is avoided.
The high-voltage fuse is connected with one end of a voltage-dividing capacitor C1 between the high-voltage electricity-taking capacitor C, the other end of a voltage-dividing capacitor C1 is connected with one end of a voltage-dividing capacitor C2, the other end of the voltage-dividing capacitor C2 is grounded together with the negative electrode of a primary side winding of a transformer T, a low-voltage transformer B is connected to the voltage-dividing capacitor C2 in parallel, the other end of the low-voltage transformer B is connected with FTU equipment, and phase voltage on a high-voltage bus can be obtained according to the capacity ratio between the high-voltage electricity-taking capacitor C and the voltage-dividing capacitor C2 by measuring the voltage value output by the voltage-dividing capacitor C2.
C is a high-voltage electricity-taking capacitor, a 2500p-6600p high-voltage ceramic capacitor is selected, the high-voltage ceramic capacitor has good impact resistance, a good temperature coefficient and small temperature drift in a high-temperature and low-temperature state, the capacitance loss of the capacitor has extremely high stability along with the change of temperature frequency, and a special series structure is suitable for long-term and reliable work under high voltage, has lightning strike resistance, and has the characteristics of stability and long service life; c1 is a ceramic capacitor of 620pf, C2 is a ceramic capacitor of 1.9uf, C, C1 and C2 are integrally cast and molded; the upper end is provided with a high-voltage fuse for protection and protection.
The invention adopts vacuum epoxy resin to integrally pour, the capacitor is independently poured, the transformer and the protection device are independently poured, and the high-low voltage protection circuit is provided, so that the high voltage protection can keep the equipment intact when the high voltage is 48kV, and protect the low voltage side circuit and the equipment.
And the cable between the voltage dividing capacitor C2 and the FTU equipment adopts a low-capacitance double-shielding-layer connecting cable.
During specific operation, the high voltage on the high-voltage bus can be selected to be 5775V, the high-voltage electricity-taking capacitor C with the capacity of 6000P, the voltage-dividing capacitor C1 with the capacity of 620pf and the voltage-dividing capacitor C2 with the capacity of 1.9uf are selected, an electricity-taking loop passes through a high-voltage fuse, is connected to the high-voltage electricity-taking capacitor C and the transformer T, and then is grounded; impedance voltage division formed by the high-voltage electricity-taking capacitor C and the transformer T is realized, the voltage of the low-voltage side of the high-voltage electricity-taking capacitor C is 1400V, the 1400V voltage is reduced by the transformer T to be 32V alternating current voltage, and the alternating current voltage is rectified, changed and stabilized to obtain stable output DC 24V.
The measurement return circuit passes through divider capacitor C1 and divider capacitor C2 transform, and the voltage drop of most voltage is at divider capacitor C1, and the voltage at divider capacitor C2 both ends is through transformer B isolation conversion after the partial pressure, and the voltage of output isolation is gathered for FTU equipment and is used, for example: voltage signals of 10kV/√ 3 are subjected to capacitive voltage division by C1 and C2 to obtain 3.25/√ 3V; the signal is subjected to transformer isolation conversion, and an isolated 3.25/V3V signal is output and collected and used by FTU equipment.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (5)
1. The utility model provides a capacitanc high pressure is from getting electric power and measuring integrative device, gets electric capacity C, characterized by including the high pressure: one end of the high-voltage electricity taking capacitor C is connected with a high-voltage bus, high-voltage electricity taking is carried out in an electric field existing around the high-voltage bus, the other end of the high-voltage electricity taking capacitor C is connected with a primary side winding of a transformer T, high-voltage alternating current obtained by the high-voltage electricity taking capacitor C is subjected to voltage reduction through the transformer T to obtain low-voltage alternating current after voltage reduction, and the low-voltage alternating current is subjected to ACDC conversion through an energy taking control plate with ACDC conversion, which is connected with a secondary side winding of the transformer T, to obtain 24V direct current; the transformer T's primary side winding department still is provided with overvoltage protection, transformer T's secondary side winding with be provided with power protection between the ACDC converter plate, high pressure get electric capacity C with be connected with high-voltage fuse between the high-voltage bus, high-voltage fuse with high pressure get between the electric capacity C with divide voltage capacitance C1's one end be connected, divide voltage capacitance C1's the other end and divide voltage capacitance C2's one end to be connected, divide voltage capacitance C2's the other end with transformer T's primary side winding's negative pole is ground connection together, divide voltage capacitance C2 and go up parallelly connected low-voltage transformer B, low-voltage transformer B's the other end and FTU equipment connection.
2. The integrated capacitive high-voltage self-powered power supply and measurement device as claimed in claim 1, wherein: and the cable between the voltage-dividing capacitor C2 and the FTU equipment adopts a low-capacitance double-shielding-layer connecting cable.
3. The integrated capacitive high-voltage self-powered power supply and measurement device as claimed in claim 1, wherein: the overvoltage protection is high-voltage protection, and a high-voltage piezoresistor is adopted to protect instantaneous overvoltage, so that the transformer is prevented from being damaged due to overvoltage.
4. The integrated capacitive high-voltage self-powered power supply and measurement device as claimed in claim 3, wherein: the power protection is low-voltage rectification protection, and a TVS tube and a semiconductor discharge tube are adopted to protect the low-voltage side, and the TVS tube is connected with a radiator.
5. The integrated capacitive high-voltage self-powered power supply and measurement device as claimed in claim 1, wherein: the voltage dividing capacitor C1 is a high-voltage capacitor, the voltage dividing capacitor C2 is a low-voltage capacitor, and the high-voltage electricity taking capacitor C, the voltage dividing capacitor C1 and the voltage dividing capacitor C2 are all single ceramic capacitors.
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| CN202123010249.5U CN216929689U (en) | 2021-12-03 | 2021-12-03 | Capacitive high-voltage self-power-taking power supply and measurement integrated device |
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| CN202123010249.5U CN216929689U (en) | 2021-12-03 | 2021-12-03 | Capacitive high-voltage self-power-taking power supply and measurement integrated device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389371A (en) * | 2021-12-03 | 2022-04-22 | 中宝电气有限公司 | A capacitive high-voltage self-contained power supply and measurement integrated device |
| CN115313679A (en) * | 2022-08-16 | 2022-11-08 | 华北电力大学 | Energy taking circuit and system based on electric field induction |
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2021
- 2021-12-03 CN CN202123010249.5U patent/CN216929689U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114389371A (en) * | 2021-12-03 | 2022-04-22 | 中宝电气有限公司 | A capacitive high-voltage self-contained power supply and measurement integrated device |
| CN115313679A (en) * | 2022-08-16 | 2022-11-08 | 华北电力大学 | Energy taking circuit and system based on electric field induction |
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