CN214895503U - Zero sequence capacitance current on-line tester for power distribution network - Google Patents
Zero sequence capacitance current on-line tester for power distribution network Download PDFInfo
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- CN214895503U CN214895503U CN202121177135.7U CN202121177135U CN214895503U CN 214895503 U CN214895503 U CN 214895503U CN 202121177135 U CN202121177135 U CN 202121177135U CN 214895503 U CN214895503 U CN 214895503U
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Abstract
The utility model discloses a distribution network zero sequence capacitance current on-line measuring appearance, including on-line measuring machine and host computer, on-line measuring machine and host computer wireless communication are connected, and the host computer is used for sending control command and demonstration measured data to on-line measuring machine, and on-line measuring machine contains main control unit, inverter unit, measuring unit and power supply unit, and inverter unit, measuring unit and power supply unit link to each other with main control unit respectively. The power supply unit is used for providing electric energy for the main controller, the inversion unit and the measurement unit, the inversion unit converts the direct-current voltage into alternating-current voltage with required frequency, and the measurement unit collects voltage signals and current signals respectively, transmits the voltage signals and the current signals to the main controller after processing and displays the voltage signals and the current signals on the upper computer. The utility model provides an online tester can the on-line measuring distribution network zero sequence electric capacity current, provides the foundation for the parameter configuration of equipment such as arc suppression coil, ground fault protection device, a secondary fusion switch, ensures the safety and stability operation of electric wire netting.
Description
Technical Field
The utility model relates to an electric power test technical field especially relates to a distribution network zero sequence capacitance current on-line measuring appearance.
Background
The zero sequence capacitance current of the power distribution network can influence the parameter configuration of intelligent equipment such as arc suppression coils, ground fault protection devices, primary and secondary fusion switches and the like, and is a key index for the safe operation of the power distribution network equipment. The existing zero sequence capacitance current measuring method adopting a secondary injection method and the like is influenced by factors such as a measuring scheme, a system capacitance current level, operating equipment parameters, harmonic load and the like, and has the defect that online measurement cannot be realized.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at prior art not enough, provide a distribution network zero sequence electric capacity current on-line measuring appearance, realize the on-line measuring of distribution network zero sequence electric capacity current.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a distribution network zero sequence capacitance current on-line measuring appearance, the tester includes online measuring machine and host computer, online measuring machine and host computer wireless communication connection, and the host computer is used for sending control command and demonstration measured data to online measuring machine, and online measuring machine contains main control unit, contravariant unit, measuring element and power supply unit, and contravariant unit, measuring element and power supply unit link to each other with main control unit respectively.
Further, the main controller is an embedded microcontroller.
Furthermore, the inverter unit is a single-phase full-bridge controllable inverter circuit.
Furthermore, the measuring unit comprises a voltage acquisition circuit and a current acquisition circuit, the voltage acquisition circuit comprises 1 Hall voltage sensor and a signal conditioning circuit thereof, and the current acquisition circuit comprises 1 Hall current sensor and a signal conditioning circuit thereof.
Furthermore, the power supply unit is a single-phase full-bridge uncontrollable rectifying circuit.
Furthermore, the online measuring machine and the upper computer are in data communication through Bluetooth.
Further, the upper computer comprises an input unit and a display unit, so that the control command is input through the input unit and the measurement data is displayed through the display unit.
Compared with the prior art, the utility model provides a distribution network zero sequence capacitance current on-line measuring appearance has following beneficial effect:
1. the utility model provides a distribution network zero sequence capacitance current on-line measuring appearance contains online measuring machine and host computer, online measuring machine and host computer wireless communication connection, and the host computer is used for sending control command and demonstration measured data to online measuring machine, and online measuring machine contains main control unit, contravariant unit, measuring unit and power supply unit, and contravariant unit, measuring unit and power supply unit link to each other with main control unit respectively.
The power supply unit is used for providing the electric energy for main control unit, contravariant unit and measuring unit, and the contravariant unit converts DC voltage into alternating voltage, and measuring unit contains voltage acquisition circuit and current acquisition circuit, gathers voltage signal and current signal respectively, transmits after handling for main control unit and shows on the host computer. The utility model provides a distribution network zero sequence electric capacity current on-line measuring appearance can the on-line measuring distribution network zero sequence electric capacity current.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a system block diagram of the zero sequence capacitance current online tester for a power distribution network provided by the utility model;
fig. 2 is a schematic diagram of the zero sequence capacitance current online tester of the power distribution network provided by the utility model;
FIG. 3 is a schematic diagram of the power supply unit shown in FIG. 1;
FIG. 4 is a schematic diagram of the inverter unit shown in FIG. 1;
fig. 5 is a schematic diagram of the measuring unit shown in fig. 1.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a system block diagram of an online zero-sequence capacitance current tester for a power distribution network provided by the present invention; the utility model provides a distribution network zero sequence capacitance current on-line measuring appearance includes on-line measuring machine and host computer, and on-line measuring machine and host computer wireless communication are connected, and the host computer is used for sending control command and demonstration measured data to on-line measuring machine, and on-line measuring machine contains main control unit, contravariant unit, measuring unit and power supply unit, and contravariant unit, measuring unit and power supply unit link to each other with main control unit respectively. In some preferred embodiments, the main controller is an embedded microcontroller.
Referring to fig. 2, fig. 2 is a schematic diagram of the zero sequence capacitance current online tester for a power distribution network provided by the present invention, in which a power supply unit rectifies a single-phase ac power and converts the rectified ac power into a dc power to provide electric energy for a main controller, an inverter unit and a measurement unit; the inversion unit converts the DC voltage into AC voltage, the main controller generates driving signals by pulse width modulation technology according to the instructions of the upper computer, and drives four thyristors S in the inversion unit1、S2、S3、S4Switching on and off to generate alternating voltage with required frequency; the measuring unit comprises a voltage acquisition circuit and a current acquisition circuit, acquires voltage signals and current signals respectively, transmits the voltage signals and the current signals to the main controller after processing, and transmits the voltage signals and the current signals to the upper computer for display on the upper computer.
Referring to fig. 3, fig. 3 is a schematic diagram of the power supply unit shown in fig. 1, in which the power supply unit is a single-phase full-bridge uncontrollable rectifying circuit, the single-phase full-bridge uncontrollable rectifying circuit rectifies single-phase ac power, and then obtains a dc voltage through a voltage stabilizing capacitor C1 and a filter capacitor C2.
Referring to fig. 4, fig. 4 is a schematic diagram of the inverter unit shown in fig. 1; the inversion unit is a single-phase full-bridge controllable inversion circuit which converts direct-current voltage into alternating-current voltage and controls four thyristors S1、S2、S3、S4And switching on and off to generate alternating voltage with required frequency.
Referring to fig. 5, fig. 5 is a schematic diagram of the measurement unit shown in fig. 1, the measurement unit includes a voltage acquisition circuit and a current acquisition circuit, the voltage acquisition circuit includes 1 hall voltage sensor and a signal conditioning circuit thereof, and the current acquisition circuit includes 1 hall current sensor and a signal conditioning circuit thereof. The Hall voltage sensor and the Hall voltage sensor obtain output voltage and current signals, the output voltage and current signals are conditioned by the corresponding signal conditioning circuit and then transmitted to the high-precision AD and converted current thereof, the voltage and current signals are converted, and the voltage and current signals are connected with the main controller through the bus and transmitted to the upper computer for display.
In some preferred embodiments, the online measuring machine is in data communication with the upper computer by means including, but not limited to, bluetooth connection, 5G connection, WiFi connection, and the like. In order to facilitate the input of control commands and the display of measurement data, the upper computer includes an input unit and a display unit, the input unit includes but is not limited to a keyboard and a mouse, a button, an interactive screen capable of inputting data, and the like, and the display unit is generally a display screen.
The utility model provides a zero sequence capacitance current on-line tester of a power distribution network, a power supply unit rectifies single-phase alternating current and converts the single-phase alternating current into direct current, and electric energy is provided for a main controller, an inversion unit and a measurement unit; the main controller generates a driving signal by adopting a pulse width modulation technology according to an instruction of an upper computer, and drives four thyristors S in the inversion unit1、S2、S3、S4Switching on and off to generate alternating voltage with required frequency; the measuring unit comprises a voltage acquisition circuit and a current acquisition circuit, acquires voltage signals and current signals respectively, transmits the voltage signals and the current signals to the main controller after processing, and transmits the voltage signals and the current signals to the upper computer for display on the upper computer. The zero sequence capacitance current of the power distribution network can be detected on line, a basis is provided for parameter configuration of intelligent equipment such as arc suppression coils, ground fault protection devices and primary and secondary fusion switches, safe and stable operation of the power grid is guaranteed, and the method has strong practicability in the technical field of power testing.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. The utility model provides a distribution network zero sequence capacitive current on-line measuring appearance, its characterized in that, the tester includes on-line measuring machine and host computer, on-line measuring machine with host computer wireless communication connects, the host computer is used for right on-line measuring machine sends control command and shows measured data, on-line measuring machine contains main control unit, contravariant unit, measuring element and power supply unit, contravariant unit measuring element with power supply unit respectively with main control unit links to each other.
2. The online zero sequence capacitance current tester for power distribution networks of claim 1, wherein the main controller is an embedded microcontroller.
3. The online tester for zero sequence capacitance current of a power distribution network according to claim 1, wherein the inverter unit is a single-phase full-bridge controllable inverter circuit.
4. The online tester for zero sequence capacitance current of a power distribution network according to claim 1, wherein the measurement unit comprises a voltage acquisition circuit and a current acquisition circuit, the voltage acquisition circuit comprises 1 hall voltage sensor and a signal conditioning circuit thereof, and the current acquisition circuit comprises 1 hall current sensor and a signal conditioning circuit thereof.
5. The online tester for zero sequence capacitance current of a power distribution network according to claim 1, wherein the power supply unit is a single-phase full-bridge uncontrollable rectification circuit.
6. The online tester for zero sequence capacitance current of a power distribution network according to claim 1, wherein the online measuring machine and the upper computer are in data communication through Bluetooth.
7. The online zero sequence capacitance current tester for power distribution networks of claim 1, wherein the upper computer comprises an input unit and a display unit, so as to input control commands through the input unit and display measurement data through the display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121177135.7U CN214895503U (en) | 2021-05-28 | 2021-05-28 | Zero sequence capacitance current on-line tester for power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121177135.7U CN214895503U (en) | 2021-05-28 | 2021-05-28 | Zero sequence capacitance current on-line tester for power distribution network |
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| Publication Number | Publication Date |
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| CN214895503U true CN214895503U (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121177135.7U Active CN214895503U (en) | 2021-05-28 | 2021-05-28 | Zero sequence capacitance current on-line tester for power distribution network |
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| CN (1) | CN214895503U (en) |
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2021
- 2021-05-28 CN CN202121177135.7U patent/CN214895503U/en active Active
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