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Transformer grounding resistance measuring system and method through using photovoltaic inverter

A photovoltaic inverter and grounding resistance technology, applied in the direction of grounding resistance measurement, etc., can solve the problems of measuring the grounding resistance of transformers, etc., and achieve the effects of improving utilization efficiency, increasing revenue, and expanding the scope of functions

Active Publication Date: 2019-01-01
STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology

Therefore, the photovoltaic grid-connected inverter has the potential to measure the grounding resistance of the transformer, but there is no mention in the existing articles and patents how to use the short-term common mode current of the photovoltaic grid-connected inverter to measure the grounding resistance of the transformer

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  • Transformer grounding resistance measuring system and method through using photovoltaic inverter

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Embodiment Construction

[0047] The present invention provides a transformer grounding resistance measurement system using a photovoltaic inverter, such as figure 1 with figure 2 As shown, it includes: a photovoltaic panel 1, a power circuit 2, a photovoltaic grid-connected inverter 9 and a control system 8;

[0048] The photovoltaic grid-connected inverter 9 has an AC side and a DC side; the DC side of the photovoltaic grid-connected inverter 9 is connected to the photovoltaic battery panel 1, and the AC side of the photovoltaic grid-connected inverter 9 is connected to the grid through the power circuit 2; the control system 8 respectively connected to the power circuit 2 and the photovoltaic grid-connected inverter 9; the control system 8 is used to obtain whether the photovoltaic cell panel 1 is not generating power by connecting the photovoltaic grid-connected inverter 9; when the photovoltaic cell panel 1 is not generating power, And when the photovoltaic grid-connected inverter 9 is running i...

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Abstract

The invention provides a transformer grounding resistance measuring system and method through using a photovoltaic inverter. The direct current side of a photovoltaic grid-connected inverter is connected to a photovoltaic cell panel and an alternating current side is connected to a power grid. The photovoltaic grid-connected inverter outputs active power during a power generation phase, and does not output a common mode current. During a power non-generation phase, the grid-connected inverter is operated in a test mode and emits a common mode voltage with a certain frequency. The frequency ofthe common mode voltage is calculated according to the parasitic capacitance of a photovoltaic panel and a line impedance, and the grid-connected inverter measures the common mode current output by the photovoltaic inverter. The grounding resistance of the transformer is calculated based on an emitted common mode voltage value and a measured common mode current value so as to determine whether a transformer grounding resistance is abnormal.

Description

technical field [0001] The invention relates to the field of transformer grounding resistance measurement, in particular to a transformer grounding resistance measurement system and method using a photovoltaic inverter. Background technique [0002] In the power grid system, distribution transformers are very important equipment, which will be related to the normal operation of the power grid. In actual operation, due to the excessive resistance of the grounding resistance, a large partial voltage will be generated on the grounding resistance, which will easily damage the insulation of the low-voltage phase line. Once someone touches the transformer shell or the grounding line, it will cause electric shock accidents Serious threat to life and property safety. Secondly, the excessive resistance of the grounding resistance will cause problems such as transformer neutral point shift. Therefore, power grid operation and maintenance personnel need to regularly measure the groun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/20
CPCG01R27/20
Inventor 段美琪武奕彤王东华何振华赵全富颜廷利段辉毕胜华李淑云张建民邱金燕刘灵慧韩明黄娇王潇阳李季
Owner STATE GRID SHANDONG ELECTRIC POWER
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