Multi-output voltage transformer and secondary voltage dividing module thereof
By using a multi-parallel voltage divider unit and independent acquisition module in the voltage transformer, combined with pure capacitor loop and redundant power supply, the problem of poor anti-interference ability of the multiple output voltage transformer is solved, and the independence of each signal is achieved Transmission and high reliability output.
Patent Information
- Application Number
- CN202323669049.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2033-12-29
AI Technical Summary
The secondary voltage divider circuit of existing multiple output voltage transformers has poor anti-interference ability and is susceptible to environmental interference, and failure of the first circuit will affect other output lines.
Design a multi-output voltage transformer, adopt multiple parallel voltage division units for secondary voltage division, and connect it with independent acquisition submodules, and adopt pure capacitor loops and redundant power supply modules to ensure each voltage division signal Independent transmission and output.
It improves the anti-interference ability of multiple outputs, ensures that one circuit failure will not affect other output lines, and improves the reliability and independence of the system.
Smart Images
Figure CN222232551U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of voltage transformer design and manufacturing, and specifically relates to a multi-channel output voltage transformer and a secondary voltage dividing module thereof. Background Art
[0002] Existing AC voltage transformers are mainly divided into two categories: analog output and digital output. Analog output mainly includes electromagnetic voltage transformer and CVT capacitor voltage transformer; digital output uses capacitor voltage division to directly convert into digital quantity, and then outputs digital signals through optical fiber.
[0003] Since both electromagnetic voltage transformers and capacitive voltage transformers with analog output have disadvantages such as complex insulation structure, narrow dynamic range, easy to cause ferromagnetic resonance, large size and output signal susceptible to electromagnetic interference, it is difficult to meet the development needs of networking, digitalization and intelligence of power systems. Therefore, more and more electronic voltage transformers are currently used; electronic voltage transformers are based on the principle of capacitive voltage division, using a stacked series form of primary capacitors, and realizing voltage division through multiple capacitors in series, converting a primary high-voltage signal into a low-voltage signal, and then inputting it into the electronic unit through a shielded cable to realize analog-to-digital signal conversion and digital signal processing, and output digital quantity. The product principle is as follows Figure 1 shown.
[0004] For example, a Chinese utility model patent with the authorization announcement number CN201903570U discloses a capacitor voltage divider type electronic voltage transformer, which includes a capacitor voltage divider and a base, and the capacitor voltage divider is composed of a high-voltage capacitor and a medium-voltage capacitor; a primary side electronic module is provided in the base, and the primary side electronic module includes a secondary voltage divider circuit composed of two resistors; the secondary voltage divider circuit is to divide the output voltage (50V) of the capacitor voltage divider into a low-voltage signal that can be processed by a smaller electronic circuit. However, this scheme can only realize the output of one digital signal; in the prior art, in order to realize multi-channel output, it is usually necessary to collect the voltage at the same voltage divider point through multiple voltage collectors, and then perform analog-to-digital signal conversion and digital signal processing on each collected voltage, and output digital quantity; and this method is susceptible to environmental interference, and if a circuit for collecting and converting signals fails, it will also affect other circuits for collecting and converting signals connected to the same voltage divider point, resulting in poor anti-interference ability of multi-channel output. Utility Model Content
[0005] The utility model aims to provide a voltage transformer with multiple outputs and a secondary voltage division module thereof, which are used to solve the problem that the circuits corresponding to the multiple outputs of the secondary voltage division in the existing voltage transformer with multiple outputs have poor anti-interference ability.
[0006] In order to achieve the above-mentioned purpose, the utility model provides a secondary voltage division module of a voltage transformer with multiple outputs, including multiple voltage division units connected in parallel, which are used to perform secondary voltage division on the output voltage after primary voltage division; each voltage division unit is also used to be connected to a corresponding acquisition submodule respectively, so that the acquisition submodule can respectively collect the voltage signal output by each voltage division unit after secondary voltage division.
[0007] Furthermore, the circuit in the voltage dividing unit is a pure capacitive circuit.
[0008] Furthermore, the voltage dividing unit includes a series circuit of a plurality of upper and lower bridge arms; and the upper bridge arm and the lower bridge arm each include a plurality of series and / or parallel capacitors.
[0009] The beneficial effects of the technical solution of the secondary voltage divider module of the multi-channel output voltage transformer of the utility model include: through the multiple parallel voltage divider units in the secondary voltage divider module and the corresponding relationship with the acquisition module, multiple independent analog voltage signals (i.e., voltage divider signals) can be obtained from the multiple voltage divider units, thereby realizing the independent transmission and output of each voltage divider signal; even if the related circuits for acquisition and signal conversion processing corresponding to one voltage divider signal fail, it will not affect other output lines, thereby improving the anti-interference ability of the multi-channel output after the secondary voltage division.
[0010] The utility model also provides a multi-channel output voltage transformer, including a secondary voltage division module, wherein the secondary voltage division module includes a plurality of voltage division units connected in parallel, which are used to perform secondary voltage division on the output voltage after the primary voltage division; the voltage transformer also includes a collection submodule corresponding to each voltage division unit, which is used to collect the voltage signal output by each voltage division unit after the secondary voltage division.
[0011] Furthermore, the circuit in the voltage dividing unit is a pure capacitive circuit.
[0012] Furthermore, the voltage dividing unit includes a series circuit of a plurality of upper and lower bridge arms; and the upper bridge arm and the lower bridge arm each include a plurality of series and / or parallel capacitors.
[0013] Furthermore, it also includes multiple power supply modules for respectively supplying power to each group of acquisition modules; each group of acquisition modules includes several acquisition modules.
[0014] Furthermore, the power supply module includes a plurality of power connection terminals for respectively connecting to different power supplies to provide redundant power supply to the power supply module.
[0015] Furthermore, the acquisition submodule is also used to perform analog-to-digital conversion on the voltage signal output by the acquired voltage division unit after secondary voltage division, so as to obtain a corresponding digital signal.
[0016] Furthermore, the primary voltage dividing module of the voltage transformer comprises capacitors connected in series and a closed casing for accommodating the capacitors, and the closed casing is filled with insulating gas.
[0017] The beneficial effects of the technical solution of the multi-channel output voltage transformer of the utility model include: through multiple parallel voltage dividing units in the secondary voltage dividing module and the corresponding acquisition module, multiple independent analog voltage signals (i.e., voltage dividing signals) can be obtained from multiple voltage dividing units, thereby realizing independent transmission and output of each voltage dividing signal; even if the related circuits for acquisition and signal conversion processing corresponding to one voltage dividing signal fail, it will not affect other output lines, thereby improving the anti-interference ability of the multi-channel output. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the principle of an existing electronic voltage transformer in the background technology of the utility model;
[0019] Figure 2 It is a schematic diagram of the electrical structure of a voltage transformer with multiple outputs in an embodiment of the voltage transformer with multiple outputs of the utility model;
[0020] Figure 3 It is a schematic diagram of the electrical structure of each voltage dividing unit of the multi-channel output voltage transformer in the embodiment of the multi-channel output voltage transformer of the utility model;
[0021] Figure 4 It is a schematic diagram of the connection mode of the power supply module of the multi-output voltage transformer in the embodiment of the multi-output voltage transformer of the utility model. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0023] Implementation of voltage transformer with multiple outputs
[0024] This embodiment provides a technical solution for a voltage transformer with multiple outputs. Figure 2 , including a secondary voltage division module, the secondary voltage division module includes a plurality of voltage division units connected in parallel, such as Figure 2 As shown in the dark dotted box, it is used to perform secondary voltage division on the output voltage after the primary voltage division; the voltage transformer also includes acquisition submodules corresponding to each voltage division unit, which are used to respectively acquire the voltage signals output by each voltage division unit after the secondary voltage division.
[0025] Therefore, the multi-output voltage transformer of this embodiment can obtain multiple independent analog voltage signals (i.e., voltage division signals) from multiple voltage division units through multiple parallel voltage division units in the secondary voltage division module and the corresponding acquisition module, thereby realizing independent transmission and output of each voltage division signal; even if the related circuits for acquisition and signal conversion processing corresponding to one voltage division signal fail, it will not affect other output lines, thereby improving the anti-interference capability of the multi-channel output.
[0026] In this embodiment, the circuit in the voltage divider unit is a pure capacitive circuit; specifically, each voltage divider unit includes a series circuit of several upper and lower bridge arms; the upper and lower bridge arms each contain multiple series and parallel capacitors; the upper and lower bridge arms are equivalent to two series-connected module units in the voltage divider unit, and each module unit is composed of multiple capacitors in series and parallel to form a circuit network. When one of the components fails, the impact on the voltage divider circuit can be reduced, thereby improving the reliability of the voltage divider network. Figure 3 As shown, in the first voltage divider unit, the upper bridge arm includes C1, C2, C5, and C6, which are all main voltage divider capacitors, and the lower bridge arm includes C3, C4, C7, and C8, which are reserved spaces for fine-tuning capacitors, and fine-tuning is performed according to the capacitance error of the main voltage divider capacitor; the acquisition unit is connected in parallel with the lower bridge arm of the voltage divider unit, and the voltage signal after secondary voltage division can be obtained from the voltage divider unit. It can be seen that each voltage divider unit in the secondary voltage divider module adopts a pure capacitive voltage division circuit design, without the presence of resistor devices, and can better match the frequency response characteristics of the primary partial capacitor voltage divider loop, and can achieve good voltage signal transmission under high-frequency voltage signals, and there is no phase deviation problem.
[0027] The multi-channel output voltage transformer of this embodiment also includes multiple power supply modules, which are used to supply power to each group of acquisition modules respectively; each group of acquisition modules includes several acquisition modules. That is, a group power supply design is adopted, and n acquisition modules are powered by m groups of power supply modules. Among them, since the failure rate λ(t) of the power supply module usually conforms to the variation law of the bathtub curve, its failure rate will tend to a constant value after aging assessment, then the reliability R(t) of a single power supply module satisfies:
[0028]
[0029] Assuming that a single power module fails or fails, all the acquisition modules in the group will lose power and have no signal output. However, compared with the conventional single power module to supply energy to all n acquisition modules, the reliability of the grouped power module configuration will be greatly improved. Specifically, the overall reliability of the power module in the m-way parallel redundant mode is:
[0030]
[0031] Therefore, the reliability of the group power supply mode is improved compared to that of a single power supply module. Taking a single power supply and three groups of power supplies as examples, the calculation and comparison of the reliability over a 10-year period are shown in Table 1 below:
[0032] Table 1
[0033] time Single power module power supply 3 groups of power modules for energy supply reliability 1 year 99.678％ 99.997％ 2 years 98.785％ 99.956％ 3 years 97.417％ 99.800％ 4 years 95.660％ 99.435％ 5 years 93.587％ 98.766％ 6 years 91.262％ 97.710％ 7 years 88.740％ 96.197％ 8 years 86.069％ 94.178％ 9 years 83.288％ 91.622％ 10 years 80.434％ 88.515％
[0034] It can be seen that the use of group power supply can effectively improve power supply reliability.
[0035] like Figure 4 As shown in the figure, n acquisition modules are powered by m power modules; taking each group of 3 acquisition modules as an example, 1 power module is used for power supply, then m = n / 3. The power supply module includes multiple power connection terminals, which are used to connect to different power supplies respectively, so as to provide redundant power supply to the power supply module, further improving the power supply reliability; for details, refer to Figure 4 In this embodiment, each power module adopts two ±DC 110V or ±DC 110V station DC power supplies for redundant power supply, avoiding the problem of using laser power supply, which causes the optical power to drop and fail after long-term operation, resulting in reduced power supply reliability.
[0036] The acquisition submodule is also used to perform analog-to-digital conversion on the voltage signal output by the voltage divider unit after the secondary voltage division to obtain the corresponding digital signal. That is, the acquisition module also integrates the analog-to-digital conversion function, which is convenient for directly processing the analog voltage signal obtained by the secondary voltage division after acquisition to obtain the corresponding digital signal. In this embodiment, the acquisition module outputs a digital signal with a sampling rate of 100kHz, which meets the needs of high-speed data transmission and low latency of the measuring device in the project.
[0037] And, refer to Figure 2 In this embodiment, the primary voltage divider module of the voltage transformer includes capacitors C1 and C2 connected in series, wherein C1 is composed of a capacitor string in a light-colored dotted frame, and the primary voltage divider module also includes a closed housing for accommodating these series capacitors, and the closed housing is filled with insulating gas (usually SF6). Therefore, the primary part adopts a capacitor string voltage divider structure and is filled with gas insulation, with high insulation reliability and no flammable or explosive hazards.
[0038] Secondary voltage dividing module embodiment of voltage transformer with multiple outputs
[0039] The present embodiment provides a technical solution for a secondary voltage dividing module of a voltage transformer with multiple outputs, wherein the secondary voltage dividing module comprises a plurality of voltage dividing units connected in parallel, which are used to perform secondary voltage division on the output voltage after primary voltage division; each voltage dividing unit is also used to be connected to a corresponding acquisition submodule, so that the acquisition submodule can respectively acquire the voltage signal output by each voltage dividing unit after secondary voltage division.
[0040] In this embodiment, the circuit in the voltage divider unit is a pure capacitive circuit; specifically, the voltage divider unit includes a series circuit of several upper and lower bridge arms; the upper bridge arm and the lower bridge arm both include multiple series and parallel capacitors. In fact, the secondary voltage divider module of this embodiment is the secondary voltage divider module of the multi-output voltage transformer in the above-mentioned multi-output voltage transformer embodiment; since the specific structure and principle of the secondary voltage divider module of this embodiment have been described in detail in the above-mentioned multi-output voltage transformer embodiment, it will not be repeated here.
[0041] The utility model has the following features:
[0042] 1) Through the multiple parallel voltage-dividing units in the secondary voltage-dividing module and their corresponding relationship with the acquisition module, multiple independent analog voltage signals (i.e., voltage-dividing signals) can be obtained from the multiple voltage-dividing units, thereby realizing the independent transmission and output of each voltage-dividing signal; even if the related circuits for acquisition and signal conversion processing corresponding to one voltage-dividing signal fail, it will not affect other output lines, thereby improving the anti-interference ability of multiple outputs after the secondary voltage division.
[0043] 2) Each voltage-dividing unit in the secondary voltage-dividing module adopts a pure capacitive voltage-dividing circuit design without any resistor devices, which can better match the frequency response characteristics of the primary capacitive voltage-dividing circuit, and can achieve good voltage signal transmission under high-frequency voltage signals without phase deviation problems.
[0044] 3) Each group of acquisition modules is powered by multiple power supply modules, and the power supply module includes multiple power connection terminals, which are respectively connected to different power supplies to provide redundant power supply to the power supply module, thereby improving power supply reliability.
[0045] It should be understood that the above specific embodiments of the present invention are only used to exemplify or explain the principles of the present invention, and do not constitute a limitation to the present invention.
Claims
1. A secondary voltage dividing module of a voltage transformer with multiple outputs, characterized in that: It includes a plurality of voltage dividing units connected in parallel, which are used to perform secondary voltage division on the output voltage after primary voltage division; each voltage dividing unit is also used to be connected to a corresponding acquisition submodule, so that the acquisition submodule can respectively acquire the voltage signal output by each voltage dividing unit after secondary voltage division.
2. The secondary voltage dividing module of the voltage transformer with multiple outputs according to claim 1, characterized in that: The circuit in the voltage dividing unit is a pure capacitive circuit.
3. The secondary voltage dividing module of the voltage transformer with multiple outputs according to claim 1 or 2, characterized in that: The voltage dividing unit includes a series circuit of a plurality of upper bridge arms and a lower bridge arm, and the upper bridge arm and the lower bridge arm each include a plurality of series and / or parallel-series capacitors.
4. A voltage transformer with multiple outputs, comprising a secondary voltage dividing module, characterized in that: The secondary voltage division module includes a plurality of voltage division units connected in parallel, which are used to perform secondary voltage division on the output voltage after primary voltage division; the voltage transformer also includes a collection submodule corresponding to each voltage division unit, which is used to collect the voltage signal output by each voltage division unit after secondary voltage division.
5. The voltage transformer with multiple outputs according to claim 4, characterized in that: The circuit in the voltage dividing unit is a pure capacitive circuit.
6. The multi-output voltage transformer according to claim 4 or 5, characterized in that: The voltage dividing unit includes a series circuit of a plurality of upper bridge arms and a lower bridge arm, and the upper bridge arm and the lower bridge arm each include a plurality of series and / or parallel capacitors.
7. The multi-output voltage transformer according to claim 4 or 5, characterized in that: It also includes multiple power supply modules for respectively supplying power to each group of acquisition modules; each group of acquisition modules includes several acquisition modules.
8. The voltage transformer with multiple outputs according to claim 7, characterized in that: The power supply module includes a plurality of power connection terminals for respectively connecting to different power supplies to provide redundant power supply to the power supply module.
9. The voltage transformer with multiple outputs according to claim 4 or 5, characterized in that: The acquisition submodule is also used to perform analog-to-digital conversion on the voltage signal output by the acquired voltage division unit after secondary voltage division, so as to obtain a corresponding digital signal.
10. The voltage transformer with multiple outputs according to claim 4 or 5, characterized in that: The primary voltage dividing module of the voltage transformer comprises capacitors connected in series and a closed casing for accommodating the capacitors, wherein the closed casing is filled with insulating gas.