WO2021098325A1 - 一种电压采集补偿电路 - Google Patents

一种电压采集补偿电路 Download PDF

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WO2021098325A1
WO2021098325A1 PCT/CN2020/111515 CN2020111515W WO2021098325A1 WO 2021098325 A1 WO2021098325 A1 WO 2021098325A1 CN 2020111515 W CN2020111515 W CN 2020111515W WO 2021098325 A1 WO2021098325 A1 WO 2021098325A1
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capacitor
voltage
discharge tube
voltage sensor
compensation circuit
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PCT/CN2020/111515
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English (en)
French (fr)
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李旭光
钟子华
龚学毅
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珠海许继电气有限公司
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Publication of WO2021098325A1 publication Critical patent/WO2021098325A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier

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  • the invention relates to the technical field of power distribution equipment, in particular to a voltage acquisition and compensation circuit.
  • On-line monitoring of overhead line loss requires accurate collection of the voltage on the overhead line.
  • the measurement and management of line loss on 10KV overhead lines are mainly realized by high-precision voltage transformers, but the voltage transformers are large in size and the voltage acquisition cost is high.
  • voltage sensors can also be used for voltage collection. Compared with voltage transformers, voltage sensors have the advantages of small size and low cost. However, the existing voltage sensors have low accuracy in collecting voltage signals.
  • the present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, the present invention provides a voltage acquisition and compensation circuit, which can compensate the voltage signal collected by the voltage sensor and improve the accuracy of the voltage signal.
  • the voltage acquisition compensation circuit includes at least one compensation unit, and each compensation unit includes a capacitor Ca1, a capacitor Cb1, a capacitor Cc1, and a capacitor C01.
  • the capacitor Ca1, the capacitor Cb1 And the first end of the capacitor Cc1 are respectively used to input the three-phase low voltage signal of the voltage sensor, the second end of the capacitor Ca1, the capacitor Cb1 and the capacitor Cc1 are connected in parallel with the first end of the capacitor C01 The second terminal of the capacitor C01 is grounded.
  • the three-phase low voltage signal of the voltage sensor is an AC signal.
  • the capacitor Ca1, capacitor Cb1, capacitor Cc1 and capacitor C01 will generate capacitive reactance when passing the AC signal, and a voltage difference will be formed at both ends of the capacitor.
  • capacitor Ca1, capacitor Cb1 and capacitor Cc1 The voltage difference between the two ends of the capacitor C01 is the phase voltage, and the voltage difference between the two ends of the capacitor C01 is the zero sequence voltage.
  • the capacitive reactance of the capacitor is proportional to the capacitance of the capacitor.
  • the compensation unit further includes a discharge tube GTDa1, a discharge tube GTDb1, and a discharge tube GTDc1.
  • the first end of the discharge tube GTDa1 is connected to the first end of the capacitor Ca1.
  • the first end of GTDb1 is connected to the first end of the capacitor Cb1, the first end of the discharge tube GTDc1 is connected to the first end of the capacitor Cc1, the discharge tube GTDa1, the discharge tube GTDb1, and the The second ends of the discharge tube GTDc1 are all grounded.
  • the number of the compensation unit is two.
  • the capacitor Ca1, the capacitor Cb1, and the capacitor Cc1 are all ceramic capacitors.
  • the compensation unit is integrated on a PCB board.
  • the voltage acquisition and compensation circuit further includes a first voltage sensor, a second voltage sensor, and a third voltage sensor.
  • the first voltage sensor is connected to the first end of the capacitor Ca1
  • the second voltage sensor is connected to the first end of the capacitor Ca1.
  • the voltage sensor is connected to the first end of the capacitor Cb1
  • the third voltage sensor is connected to the first end of the capacitor Cc1.
  • Figure 1 is one of the circuit schematic diagrams of the embodiment of the present invention.
  • Fig. 2 is the second schematic circuit diagram of the embodiment of the present invention.
  • Fig. 3 is the third circuit schematic diagram of the embodiment of the present invention.
  • this embodiment discloses a voltage acquisition and compensation circuit, which includes at least one compensation unit 100.
  • Each compensation unit 100 includes a capacitor Ca1, a capacitor Cb1, a capacitor Cc1, and a capacitor C01.
  • the capacitor Ca1, the capacitor Cb1, and the capacitor The first end of Cc1 is used to input the three-phase low voltage signal of the voltage sensor.
  • the second ends of the capacitor Ca1, the capacitor Cb1 and the capacitor Cc1 are connected in parallel and then connected to the first end of the capacitor C01, and the second end of the capacitor C01 is grounded.
  • the three-phase low voltage signal of the voltage sensor is an AC signal.
  • the capacitor Ca1, capacitor Cb1, capacitor Cc1 and capacitor C01 will generate capacitive reactance when passing the AC signal, and a voltage difference will be formed at both ends of the capacitor.
  • the capacitive reactance of the capacitor Xc 1/2 ⁇ fc, where f is the frequency of the AC signal, and c is the capacitance of the capacitor.
  • f the frequency of the AC signal
  • c the capacitance of the capacitor.
  • the capacitive reactance of the capacitor is proportional to the capacitance of the capacitor. Setting the capacitance of the capacitor can compensate the voltage signal collected by the voltage sensor and improve the accuracy of the voltage signal.
  • the compensation unit 100 further includes a discharge tube GTDa1, a discharge tube GTDb1, and a discharge tube GTDc1.
  • the first end of the discharge tube GTDa1 is connected to the first end of the capacitor Ca1.
  • One end is connected to the first end of the capacitor Cb1, the first end of the discharge tube GTdc1 is connected to the first end of the capacitor Cc1, and the second ends of the discharge tube GTDa1, the discharge tube GTDb1 and the discharge tube GTDc1 are all grounded.
  • the three-phase low voltage signal of the voltage sensor is too large, it can be introduced into the earth through the discharge tube GTDa1, the discharge tube GTDb1 or the discharge tube GTDc1, thereby playing the role of overvoltage protection.
  • the number of compensation units 100 is two, which can collect the power side and load side voltage of the on-column circuit breaker load switch at the same time, which can avoid the influence of closing and opening actions of the on-column circuit breaker load switch.
  • the terminal JP1 is used for an external voltage sensor, and the terminal JP2 is used for outputting a compensated voltage signal.
  • the capacitor Ca1, the capacitor Cb1, and the capacitor Cc1 are all ceramic capacitors. Ceramic capacitors have the characteristics of low temperature drift, stable performance, and reliable insulation. According to the size of the three-phase low voltage signal of the voltage sensor, the capacitances of the capacitors Ca1, Cb1 and Cc1 can be adjusted to achieve the measurement and collection of the phase voltage. In order to improve the acquisition accuracy, the capacitor Ca1, the capacitor Cb1, and the capacitor Cc1 are all ceramic capacitors with an accuracy of ⁇ 5%.
  • the compensation unit 100 is integrated and installed on a PCB board and independently installed in the terminal, so as to be isolated from the high-voltage environment, avoid the influence of the high-voltage electric field, has stable accuracy, and can be maintained or repaired without power failure of the power grid. Further, a plurality of compensation units 100 can be integrated and arranged on a PCB board to improve the integration level of the circuit.
  • the voltage acquisition and compensation circuit of this embodiment further includes a first voltage sensor, a second voltage sensor, and a third voltage sensor, and no additional voltage sensor is required, which is convenient for use.
  • the first voltage sensor is connected to the first end of the capacitor Ca1
  • the second voltage sensor is connected to the first end of the capacitor Cb1
  • the third voltage sensor is connected to the first end of the capacitor Cc1.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

一种电压采集补偿电路，包括至少一个补偿单元，每个补偿单元均包括电容Ca1、电容Cb1、电容Cc1和电容C01，电容Ca1、电容Cb1和电容Cc1的第一端分别用于输入电压传感器的三相低压信号，电容Ca1、电容Cb1和电容Cc1的第二端并联连接后与电容C01的第一端连接，电容C01的第二端接地。电压传感器的三相低压信号为交流信号，电容Ca1、电容Cb1、电容Cc1和电容C01在通过交流信号时产生容抗，电容两端形成压差，其中，电容Ca1、电容Cb1和电容Cc1的两端压差为相电压，电容C01的两端压差为零序电压。在交流信号频率一定的情况下，电容的容抗与电容的容值成比例关系，通过合理的设置电容的容值，可以对电压传感采集的电压信号进行补偿，提高电压信号的精度。

Description

一种电压采集补偿电路
相关申请的交叉引用
本申请基于申请号为201911126856.2、申请日为2019年11月18日的中国专利申请提出，并要求中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及配电设备技术领域，特别涉及一种电压采集补偿电路。
背景技术
架空线路损耗在线监测需要对架空线路上的电压进行精确采集。目前应用于10KV架空线路上的线损计量和管理主要是通过高精度电压互感器实现，但是电压互感器的体积大，且电压采集成本高。除了采用电压互感器采集电压外，还可以采用电压传感器进行电压采集，与电压互感器相比，电压传感器具有体积小、成本低的优点，但是，现有的电压传感器采集电压信号精度不高。
发明内容
本发明旨在至少解决现有技术中存在的技术问题之一。为此，本发明提出一种电压采集补偿电路，能够对电压传感器采集的电压信号进行补偿，提高电压信号的精度。
根据本发明的第一方面实施例的电压采集补偿电路，包括至少一个补偿单元，每个所述补偿单元均包括电容Ca1、电容Cb1、电容Cc1和电容C01，所述电容Ca1、所述电容Cb1和所述电容Cc1的第一端分别用于输入电压传感器的三相低压信号，所述电容Ca1、所述电容Cb1和所述电容Cc1的第二端并联连接后与所述电容C01的第一端连接，所述电容C01的第二端接地。
根据本发明实施例的电压采集补偿电路，至少具有如下有益效果：
电压传感器的三相低压信号为交流信号，电容Ca1、电容Cb1、电容Cc1和电容C01在通过交流信号时会产生容抗，电容两端会形成压差，其中，电容Ca1、电容Cb1和电容Cc1的两端压差为相电压，电容C01的两端压差为零序电压。在交流信号频率一定的情况下，电容的容抗与电容的容值成比例关系，通过合理的设置电容的容值，可以对电压传感采集的电压信号进行补偿，提高电压信号的精度。
根据本发明的一些实施例，所述补偿单元还包括放电管GTDa1、放电管GTDb1和放电管GTDc1，所述放电管GTDa1的第一端与所述电容Ca1的第一端连接，所述放电管GTDb1的第一端与所述电容Cb1的第一端连接，所述放电管GTDc1的第一端与所述电容Cc1的第一端连接，所述放电管GTDa1、所述放电管GTDb1和所述放电管GTDc1的第二端均接地。
根据本发明的一些实施例，所述补偿单元的数量为两个。
根据本发明的一些实施例，所述电容Ca1、所述电容Cb1和所述电容Cc1均采用陶瓷电容。
根据本发明的一些实施例，所述补偿单元集成设置在一PCB板上。
根据本发明的一些实施例，电压采集补偿电路还包括第一电压传感器、第二电压传感器和第三电压传感器，所述第一电压传感器与所述电容Ca1的第一端连接，所述第二电压传感器与所述电容Cb1的第一端连接，所述第三电压传感器与所述电容Cc1的第一端连接。
本发明的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
本发明的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1为本发明实施例的电路原理图之一；
图2为本发明实施例的电路原理图之二；
图3为本发明实施例的电路原理图之三。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。
请参照图1，本实施例公开了一种电压采集补偿电路，包括至少一个补偿单元100，每个补偿单元100均包括电容Ca1、电容Cb1、电容Cc1和电容C01，电容Ca1、电容Cb1和电容Cc1的第一端分别用于输入电压传感器的三相低压信号，电容Ca1、电容Cb1和电容Cc1的第二端并联连接后与电容C01的第一端连接，电容C01的第二端接地。
电压传感器的三相低压信号为交流信号，电容Ca1、电容Cb1、电容Cc1和电容C01在通过交流信号时会产生容抗，电容两端会形成压差，其中，电容Ca1、电容Cb1和电容Cc1的两端压差为相电压，电容C01的两端压差为零序电压，即A相电压＝Ua1-U01，B相电压＝Ub1-U01，C相电压＝Uc1-U01，零序电压＝U01-Ucom1。电容的容抗Xc＝1/2πfc，其中f为交流信号的频率，c为电容的容值，在交流信号频率一定的情况下，电容的容抗与电容的容值成比例关系，通过合理的设置电容的容值，可以对电压传感采集的电压信号进行补偿，提高电压信号的精度。
请参照图2，为了提高电路的稳定性，补偿单元100还包括放电管GTDa1、放电管GTDb1和放电管GTDc1，放电管GTDa1的第一端与电容Ca1的第一端连接，放电管GTDb1的第一端与电容Cb1的第一端连接，放电管GTDc1的第一端与电容Cc1的第一端连接，放电管GTDa1、放电管GTDb1和放电管GTDc1的第二端均接地。当电压传感器的三相低压信号过大时，可通过放电管GTDa1、放电管GTDb1或放电管GTDc1导入大地，从而起到过压保护的作用。
请参照图3，补偿单元100的数量为两个，可同时采集柱上断路器负荷开关的电源侧和负荷侧电压，可以避免柱上断路器负荷开关合分闸动作的影响。其中，端子JP1用于外接电压传感器，端子JP2用于输出补偿后的电压信号。
电容Ca1、电容Cb1和电容Cc1均采用陶瓷电容。陶瓷电容具有低温漂的特点，性能稳定，绝缘可靠，根据电压传感器的三相低压信号的大小，可调整电容Ca1、电容Cb1和电容Cc1的容值，以实现相电压的计量采集。为了提高采集精度，电容Ca1、电容Cb1和电容Cc1均采用精度为±5％的陶瓷电容。
补偿单元100集成设置在一PCB板上，独立安装于终端中，从而与高压环境隔离，避免高压电场的影响，精度稳定，且可以在电网线路不停电的情况下进行维护或维修。进一步的，可以将多个补偿单元100集成设置在一PCB板上，提高电路的集成度。
本实施例的电压采集补偿电路还包括第一电压传感器、第二电压传感器和第三电压传感器，无需额外配制电压传感器，便于使用。第一电压传感器与电容Ca1的第一端连接，第二电压传感器与电容Cb1的第一端连接，第三电压传感器与电容Cc1的第一端连接。
上面结合附图对本发明实施例作了详细说明，但是本发明不限于上述实施例，在所述技术领域普通技术人员所具备的知识范围内，还可以在不脱离本发明宗旨的前提下作出各种变化。

Claims (6)

  1. 一种电压采集补偿电路，包括：
    至少一个补偿单元(100)，每个所述补偿单元(100)均包括：电容Ca1、电容Cb1、电容Cc1和电容C01，所述电容Ca1、所述电容Cb1和所述电容Cc1的第一端分别用于输入电压传感器的三相低压信号，所述电容Ca1、所述电容Cb1和所述电容Cc1的第二端并联连接后与所述电容C01的第一端连接，所述电容C01的第二端接地。
  2. 根据权利要求1所述的电压采集补偿电路，其中，所述补偿单元(100)还包括：放电管GTDa1、放电管GTDb1和放电管GTDc1，所述放电管GTDa1的第一端与所述电容Ca1的第一端连接，所述放电管GTDb1的第一端与所述电容Cb1的第一端连接，所述放电管GTDc1的第一端与所述电容Cc1的第一端连接，所述放电管GTDa1、所述放电管GTDb1和所述放电管GTDc1的第二端均接地。
  3. 根据权利要求1或2所述的电压采集补偿电路，其中，所述补偿单元(100)的数量为两个。
  4. 根据权利要求1所述的电压采集补偿电路，其中，所述电容Ca1、所述电容Cb1和所述电容Cc1均采用陶瓷电容。
  5. 根据权利要求1所述的电压采集补偿电路，其中，所述补偿单元(100)集成设置在一PCB板上。
  6. 根据权利要求1所述的电压采集补偿电路，其中，还包括第一电压传感器、第二电压传感器和第三电压传感器，所述第一电压传感器与所述电容Ca1的第一端连接，所述第二电压传感器与所述电容Cb1的第一端连接，所述第三电压传感器与所述电容Cc1的第一端连接。
PCT/CN2020/111515 2019-11-18 2020-08-26 一种电压采集补偿电路 WO2021098325A1 (zh)

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