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Resistor divider type three-phase combined voltage transformer with zero sequence voltage output

A technology of voltage transformer and resistance divider, applied in the direction of inductors, voltage dividers, transformers, etc., can solve problems such as patents and literature reports that have not been seen

Active Publication Date: 2016-10-26
ZHEJIANG HORIZON INSTR TRANSFORMERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no patents and literature reports for such a resistor-divided three-phase combined voltage transformer with zero-sequence voltage output.

Method used

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  • Resistor divider type three-phase combined voltage transformer with zero sequence voltage output
  • Resistor divider type three-phase combined voltage transformer with zero sequence voltage output
  • Resistor divider type three-phase combined voltage transformer with zero sequence voltage output

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Embodiment

[0034] Example: such as figure 1 As shown, the present invention is a resistance divider type three-phase combined voltage transformer with zero-sequence voltage output.

[0035] A-phase resistor divider 1, B-phase resistor divider 2, C-phase resistor divider 3, protection and signal conditioning circuit 4, analog-to-digital converter 5, microprocessor 6, RS485 communication interface 7 and public zero sequence Resistor 8; A-phase resistor divider 1, B-phase resistor divider 2, C-phase resistor divider 3 and public zero-sequence resistor 8 form the primary sensor 18 of the transformer; A-phase resistor divider 1 is composed of A-phase The high-voltage arm resistor 9, the A-phase low-voltage arm resistor 10 and the A-phase zero-sequence resistor 11 are connected in series, and the B-phase resistor divider 2 is composed of a B-phase high-voltage arm resistor 12, a B-phase low-voltage arm resistor 13, and a B-phase zero-sequence resistor 14. The C-phase resistor divider 3 is com...

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Abstract

The invention discloses a resistor divider type three-phase combined voltage transformer with zero sequence voltage output, which comprises an A-phase resistor divider, a B-phase resistor divider, a C-phase resistor divider, a protection and signal conditioning circuit, an analog-to-digital converter, microprocessors, a microprocessor, an RS485 communication interface and a public zero sequence resistor. The protection and signal conditioning circuit has six signal input ends and four channels of signal output ports. The protection and signal conditioning circuit consists of a discharge tube, a varistor, a voltage follower, a differential amplifying circuit and a low-pass filter circuit. The digital-to-analog converter converts the voltage signal from the protection and signal conditioning circuit into a corresponding digital signal. The microprocessor receives the digital signal and the zero sequence voltage digital signal and outputs them through the RS485 communication interface. According to the invention, the voltage transformer can simultaneously output the digital quantity which is linearly proportional to the primary voltage of each phase containing harmonic waves, measure the zero sequence voltage, and can conveniently carry out the phase voltage division ratio and the zero sequence voltage divider ratio checksum error adjustment.

Description

technical field [0001] The invention relates to an electromagnetic measuring device, in particular to a resistance divider type three-phase combined voltage transformer capable of simultaneously measuring three-phase voltage and zero-sequence voltage. Background technique [0002] Voltage transformers are mainly used for power metering, power quality analysis and safety protection of power grids. For three-phase lines, in addition to measuring the voltage of each phase, it is also necessary to monitor the unbalance of the three-phase power supply voltage and single-phase metal grounding and phase loss faults, so the zero-sequence voltage needs to be measured. The existing three-phase combined voltage transformer with zero-sequence voltage output is usually realized by using three single-phase electromagnetic voltage transformers connected in star form and the primary neutral point is grounded through the zero-sequence electromagnetic voltage transformer. When the three-phas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/04G01R19/25G01R31/08H01F38/38
Inventor 祝顺峰唐福新毛培民
Owner ZHEJIANG HORIZON INSTR TRANSFORMERS
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