Separated high-voltage capacitor electricity taking device

Abstract

The utility model discloses a separated high-voltage capacitor electricity taking device which comprises an electricity taking protection module, a rectification filtering module and a transformer. The input end of the power-taking protection module is connected with AC voltage input, and the output end is connected with the primary side of the transformer. The secondary side of the transformer is connected with the input end of the rectifying and filtering module; the output end of the rectification filtering module outputs DC voltage and is connected with a load. Wherein the power taking protection module comprises a protection unit, and the protection unit comprises a discharge tube and an overvoltage protection subunit; one end of the discharge tube is connected with the first tap of the primary side of the transformer; one end of the overvoltage protection subunit is connected with the second tap and the third tap of the primary side of the transformer, and the other end is grounded. The power-taking protection module on the primary side and the rectification filtering module on the secondary side are separately designed, so that the high-voltage circuit and the low-voltage circuit are respectively arranged on different PCBs, the electromagnetic interference of the high-voltage side to the low-voltage side is effectively reduced, and the reliability and the safety of equipment are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment, and particularly relates to a split-type high-voltage capacitor power taker. Background Art

[0002] High-voltage capacitor power taking is an important part of the primary-secondary deep integration pole-mounted switch circuit breaker, mainly used to supply power to the feeder terminal on the secondary side. It utilizes the capacitive voltage on the high-voltage transmission line and obtains the required electric energy through the principle of capacitive voltage division to supply power to the secondary circuit of the switch cabinet.

[0003] At present, there are generally some problems in the circuit design of high-voltage capacitor power taking power modules on the market. Most products adopt the method of designing the primary-side high-voltage circuit and the secondary-side low-voltage circuit on the same PCB board at the same time. This design makes the high-voltage part on the primary side very close to the low-voltage part on the secondary side, which is easy to generate electromagnetic interference, affect the operation of the low-voltage control circuit, and reduce the reliability and safety of the equipment.

[0004] In addition, the overvoltage protection ability of the existing high-voltage capacitor power taking power modules still needs to be strengthened. Due to the complex and changeable operating environment of the power system, various overvoltages such as lightning and switching overvoltages often occur on the transmission line, bringing impacts to the power taking module. The overvoltage protection circuit design of some products is not perfect enough to effectively cope with various magnitudes of overvoltages, resulting in damage to the power taking module and threatening the safety of the equipment.

[0005] At the same time, high-voltage capacitor power taking also faces challenges in the stability of the output voltage. The input voltage of capacitor power taking fluctuates with the voltage fluctuation of the transmission line, which in turn affects the stability of the output voltage. There is a lack of effective voltage stability control measures in the existing technology, which affects the power supply quality to a certain extent.

[0006] Therefore, there is an urgent need for a new type of high-voltage capacitor power taking device, which adopts a reasonable topological structure to reliably isolate the primary-side high-voltage circuit from the secondary-side low-voltage circuit, reduce interference, and improve reliability; at the same time, it has a perfect overvoltage protection function and a stable and reliable voltage output ability to meet the requirements of complex and harsh operating conditions and better adapt to the high-voltage transmission environment. Summary of the Utility Model

[0007] The utility model provides a split-type high-voltage capacitor power taker to overcome the above problems existing in the prior art.

[0008] The separable high-voltage capacitor power taker provided by the utility model comprises a power taking protection module, a rectifying and filtering module and a transformer. The input end of the power taking protection module is connected to an AC voltage input, and the output end is connected to the primary side of the transformer. The secondary side of the transformer is connected to the input end of the rectifying and filtering module. The output end of the rectifying and filtering module outputs a DC voltage and is connected to a load.

[0009] Wherein, the power taking protection module comprises a protection unit. The first end of the protection unit is connected to the primary side of the transformer, the second end is connected to the primary side of the transformer, and the protection unit is grounded.

[0010] The protection unit comprises a discharge tube and an overvoltage protection sub-unit; one end of the discharge tube is used as the first end of the protection unit and is connected to the first tap of the primary side of the transformer, and the other end is grounded; one end of the overvoltage protection sub-unit is used as the second end of the protection unit and is connected to the second tap and the third tap of the primary side of the transformer, and the other end is grounded.

[0011] Further, the power taking protection module further comprises a capacitor. The input end of the capacitor is connected to the AC voltage input, and the output end of the capacitor is connected to the primary side of the transformer and one end of the discharge tube.

[0012] Specifically, the input end of the capacitor is connected to a 10 kV AC voltage, and the output end outputs a 3388 V AC voltage.

[0013] Further, the voltage of the first tap of the primary side of the transformer is 3220 V - 3880 V, and the voltage of the second tap is 1520 V - 1860 V.

[0014] Specifically, the overvoltage protection sub-unit comprises a control circuit, a rectifying bridge and a relay. The relay is connected to the second tap and the third tap of the primary side of the transformer. One end of the rectifying bridge is connected to the third tap of the primary side of the transformer, the other end is connected to the relay and the control circuit to supply power to the relay and the control circuit, and the rectifying bridge is grounded. The control circuit is connected to the relay and is used for outputting a control signal to the relay, and the control circuit is grounded.

[0015] Further, the rectifying and filtering module comprises a rectifying unit and a filtering unit. The input end of the rectifying unit is connected to the secondary side of the transformer, and the output end is connected to the input end of the filtering unit. The output end of the filtering unit outputs a DC voltage and is connected to a load.

[0016] Further, the output voltage of the rectifying and filtering module is 12 V - 40.8 V, and the power is 5 W - 20 W.

[0017] The utility model has the following beneficial effects:

[0018] The power-taking protection module on the primary side and the rectification and filtering module on the secondary side are separately designed, so that the high-voltage circuit and the low-voltage circuit are respectively arranged on different PCB boards, effectively reducing the electromagnetic interference of the high-voltage side on the low-voltage side and improving the reliability and safety of the device.

[0019] A perfect overvoltage protection circuit is set up, including a discharge tube and an overvoltage protection sub-unit, which can effectively cope with overvoltage shocks of various amplitudes, comprehensively improving the overvoltage protection ability of the power-taking device and ensuring the safe operation of the device.

[0020] The rectification and filtering module converts the alternating current on the secondary side of the transformer into a stable direct current voltage to supply the load. At the same time, it has good filtering performance, ensuring the voltage stability of the power supply output and improving the power supply quality.

[0021] Through the cooperation of the high-voltage capacitor and the transformer, the power-taking function from the 10kV high-voltage side to the 12V - 40.8V DC power supply is realized. Among them, the capacitor plays a voltage-reducing role, reducing the 10kV voltage to 3388V. The transformer further reduces the voltage to the working voltage on the secondary side, and finally outputs a 12V - 40.8V, 5W - 20W DC power supply that meets the power supply requirements of the feeder terminal through rectification and filtering. The utility model can overcome the deficiencies of the existing high-voltage capacitor power-taking power supply, has stronger reliability, safety and adaptability, is convenient to be popularized and applied in the primary-secondary integrated switch equipment, and has a certain application prospect. Description of the Drawings

[0022] Figure 1 The figure shows a module schematic diagram of a split-type high-voltage capacitor power taker in an embodiment of the utility model;

[0023] Figure 2 The figure shows a circuit principle structure schematic diagram of a split-type high-voltage capacitor power taker in an embodiment of the utility model;

[0024] Figure 3 The figure shows a circuit structure diagram of a protection unit in an embodiment of the utility model.

[0025] Description of the reference numerals: 10. Relay, 11. First tap, 12. Second tap, 13. Third tap. Detailed Embodiment

[0026] The technical solution of the present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the described embodiments are only used to explain the technical principle of the present utility model, rather than limiting the scope of its patent protection. Those skilled in the art should understand that various transformations, modifications or equivalent replacements can be made to these embodiments without departing from the spirit and scope of the present utility model. These transformations, modifications or equivalent replacements should all be regarded as falling within the protection scope defined by the claims of the patent of the present utility model. The specific implementation manners of the present utility model have been described by way of examples. However, it should be understood that the described embodiments are only a part of the implementation manners of the present utility model, rather than all of the implementation manners. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0027] As Figure 1 shown, this embodiment provides a split-type high-voltage capacitive power taker, which includes a power-taking protection module, a rectifying and filtering module, and a transformer. The input end of the power-taking protection module is connected to the AC voltage input, and the output end is connected to the primary side of the transformer. The secondary side of the transformer is connected to the input end of the rectifying and filtering module. The output end of the rectifying and filtering module outputs a DC voltage and is connected to the load.

[0028] As Figure 2 shown, the split-type high-voltage capacitive power taker provided in this embodiment has a whole design composed of four parts: a capacitor, a transformer, a primary board, and a secondary board. The power-taking protection module corresponds to the capacitor and the primary board in the figure, and the rectifying and filtering module corresponds to the secondary board in the figure.

[0029] Specifically, the input end of the capacitor is connected to the 10 kV AC voltage input, the output end of the capacitor is connected to the primary side of the transformer and the first end of the protection unit, and outputs 3388 V AC voltage. The capacitance value of the capacitor is selected according to the output voltage and power. The second end of the protection unit is connected to the primary side of the transformer. The protection unit is grounded.

[0030] Further, the protection unit includes a discharge tube and an overvoltage protection subunit. The discharge tube is used for discharging when the device is protected against overvoltage. One end of the discharge tube is used as the first end of the protection unit and is connected to the output end of the capacitor and the first tap 11 of the primary side of the transformer. The other end of the discharge tube is grounded. One end of the overvoltage protection subunit is connected to the second tap 12 and the third tap 13 of the primary side of the transformer, and the other end is grounded. Among them, the voltage of the first tap on the primary side of the transformer is preferably 3388V, and the voltage of the second tap is preferably 1588V, but it is not limited thereto, and it can be selected within the range of the first tap voltage of 3220V to 3880V and the second tap voltage of 1520V to 1860V. The turns ratio of the transformer is selected according to the output voltage and power.

[0031] Furthermore, the overvoltage protection subunit includes a control circuit, a rectifier bridge, and a relay 10. The relay 10 is used to short-circuit the transformer tap to the ground for protection during overvoltage, and it is connected to the second tap 12 and the third tap 13 of the primary side of the transformer. One end of the rectifier bridge is connected to the third tap 13 of the primary side of the transformer, and the other end is connected to the relay 10 and the control circuit for supplying power to the relay 10 and the control circuit, and the rectifier bridge is grounded. The control circuit is connected to the relay 10 and is used to control the suction and disconnection of the relay 10 to achieve overvoltage protection and recovery, and the control circuit is grounded.

[0032] In addition, the rectification and filtering module includes a rectification unit and a filtering unit. The input end of the rectification unit is connected to the secondary side of the transformer, and the output end is connected to the input end of the filtering unit. The filtering unit uses an SA555 timer and a MOS tube to control the output voltage. The output end of the filtering unit outputs a DC voltage of 28.8V / 10W in this embodiment. According to the selected capacitor and transformer, the output voltage can meet 12V to 40.8V, and the output power can meet 5W to 20W to connect different feeder terminal loads.

[0033] When the split-type high-voltage capacitor current collector in this embodiment works, the external 10kV high-voltage alternating current is stepped down by the capacitor, and the capacitor outputs an AC voltage of 3388V. This voltage passes through the discharge tube to the first tap 11 of the primary side of the transformer.

[0034] In the normal working state, both the discharge tube and the relay are disconnected, and the 3388V voltage is directly loaded onto the first tap 11 of the primary side of the transformer. At the same time, the rectifier bridge rectifies the voltage obtained from the second tap 12 and the third tap 13 and supplies power to the relay 10, and the relay 10 remains in the suction state. The transformer transforms the 3388V voltage on the primary side into the secondary side voltage, which is rectified, filtered, and voltage-stabilized and controlled by the rectification and filtering module, and finally outputs a DC voltage of 28.8V / 10W to supply power to the feeder terminal load.

[0035] When overvoltage occurs, the control circuit in the overvoltage protection sub-unit detects the overvoltage signal and outputs a control signal to cut off the power supply to the relay coil, causing the relay to change from the closed state to the open state. At this time, the second tap 12 and the third tap 13 on the primary side of the transformer are short-circuited to the ground, and the 3388V voltage cannot be applied to the primary side of the transformer, preventing damage to the transformer, secondary side, and subsequent circuits caused by overvoltage on the high-voltage side. At the same time, the discharge tube is broken down and conducts under the action of overvoltage, providing a discharge path for the 3388V voltage and releasing the overvoltage energy, playing a role in overvoltage protection.

[0036] After the overvoltage disappears, the discharge tube returns to the open state, and the control circuit outputs a signal again to make the relay close. The second tap 12 and the third tap 13 are disconnected from the ground, and the 3388V voltage is re-applied to the primary side of the transformer, and the entire circuit returns to the normal working state.

[0037] The split-type high-voltage capacitor power taker in this embodiment separates the design of the high-voltage part on the primary side and the low-voltage part on the secondary side. The power-taking protection module directly bears a 10kV high voltage. After voltage reduction by the capacitor, it is isolated and coupled to the rectifier-filter module through the primary / secondary side of the transformer, realizing high-low voltage isolation and directional voltage reduction for power taking, and suppressing various overvoltages through the overvoltage protection circuit, improving the safety and reliability of power taking. Finally, a stable low-voltage DC power supply is supplied to the secondary equipment, which has practical value.

[0038] It should be noted that the split-type high-voltage capacitor power taker in this embodiment separates the design of the high-voltage part on the primary side and the low-voltage part on the secondary side. Among them, the power-taking protection module directly bears a 10kV high voltage. After reducing the high voltage by the capacitor, it is isolated and coupled to the rectifier-filter module through the primary / secondary side of the transformer, realizing reliable high-low voltage isolation and directional voltage reduction for power taking, and effectively suppressing various overvoltages through a perfect overvoltage protection circuit, improving the safety and reliability of power taking. Finally, a stable low-voltage DC power supply is supplied to the secondary equipment.

[0039] Figure 3 This is an optional circuit structure diagram of the protection unit in an embodiment of the present invention. Among them, the protection unit adopts solutions such as capacitor voltage reduction, discharge tube, and overvoltage protection circuit, and is provided with a corresponding control circuit to realize the automatic control of safe power taking on the high-voltage side and overvoltage protection. The rectifier-filter circuit adopts a single-phase bridge rectification and capacitor filtering solution, and is supplemented with measures to suppress voltage spikes to convert alternating current into a stable direct current power supply, which will not be elaborated here.

[0040] The protection function of the present invention is complete, cost-saving, and has a certain practical value.

[0041] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0042] The present utility model has been described in detail through the above specific embodiments. However, it should be understood that the above content is only illustrative and not intended to limit the scope of the present utility model. Those skilled in the art can make various modifications and variations to the present utility model according to the specific application scenarios and actual needs without departing from the spirit and scope of the present utility model, and these modifications and variations are within the protection scope of the present utility model.

Claims

1. A separate high-voltage capacitor collector, characterized in that: It includes a power supply protection module, a rectifier filter module and a transformer; The input end of the power taking protection module is connected to the AC voltage input, and the output end is connected to the primary side of the transformer; The secondary side of the transformer is connected to the input end of the rectifier and filter module; The output end of the rectifier and filter module outputs a DC voltage and is connected to a load; Wherein, the power supply protection module includes a protection unit; the protection unit includes a discharge tube and an overvoltage protection subunit; One end of the discharge tube is connected to the first tap of the primary side of the transformer as the first end of the protection unit; the other end of the discharge tube is grounded; One end of the overvoltage protection subunit is connected to the second tap and the third tap of the primary side of the transformer, and the other end is grounded.

2. The power supply according to claim 1, characterized in that: The power supply protection module also includes a capacitor; The input end of the capacitor is connected to an AC voltage input, and the output end of the capacitor is connected to the primary side of the transformer and the first end of the protection unit; The second end of the protection unit is connected to the primary side of the transformer; The protection unit is grounded.

3. The power supply according to claim 2, characterized in that: The first tap voltage of the primary side of the transformer is 3220V~3880V, and the second tap voltage is 1520V~1860V.

4. The power supply according to claim 1, characterized in that: The overvoltage protection subunit includes a control circuit, a rectifier bridge and a relay; The relay is connected to the second tap and the third tap of the primary side of the transformer; One end of the rectifier bridge is connected to the third tap of the primary side of the transformer, and the other end is connected to the relay and the control circuit to supply power to the relay and the control circuit, and the rectifier bridge is grounded; The control circuit is connected to the relay and is used to output a control signal to the relay. The control circuit is grounded.

5. The power supply according to claim 1, characterized in that: The rectification and filtering module comprises a rectification unit and a filtering unit, wherein the input end of the rectification unit is connected to the secondary side of the transformer, and the output end is connected to the input end of the filtering unit; The output end of the filter unit outputs a DC voltage and is connected to a load.

6. The power supply according to claim 2, characterized in that: The input end of the capacitor is connected to a 10kV AC voltage, and the output end outputs a 3388V AC voltage.

7. The power supply according to claim 1, characterized in that: The output voltage of the rectification and filtering module is 12V~40.8V, and the power is 5W~20W.

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