Distribution transformer grounding resistor, current online measurement equipment and method thereof

A distribution transformer and grounding resistance technology, which is applied in the field of current online measurement equipment and distribution transformer grounding resistance, can solve the problems of large temperature influence, small measurement range, complex circuit implementation, etc. Strong power frequency interference ability and insensitive to temperature changes

Inactive Publication Date: 2016-08-24
GUODIAN LONGYUAN ELECTRICAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Some products on the market are not online real-time monitoring, even real-time online monitoring equipment generally has a large measurement deviation, which is greatly affected by temperature, the measurement range is small, and the measurement is not accurate.
[0004] Longyuan's I-generation product can monitor the changes of grounding resistance and current value online in real time. However, this product is designed in the shape of a circular cylinde

Method used

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  • Distribution transformer grounding resistor, current online measurement equipment and method thereof
  • Distribution transformer grounding resistor, current online measurement equipment and method thereof
  • Distribution transformer grounding resistor, current online measurement equipment and method thereof

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Embodiment approach

[0048] figure 1 It is a measurement circuit block diagram of distribution transformer grounding resistance and current online measurement equipment according to an embodiment of the present invention. Note that the distribution transformer in the present invention may preferably be a station area transformer, and the on-line measurement equipment is sometimes called on-line measurement equipment, on-line measurement terminal, measurement equipment, and measurement terminal, which are essentially the same.

[0049] exist figure 1 Among them, the circuit inside the dotted line is one of the core contents of the hardware design of the present invention. The device of the present invention is composed of a sampling circuit 1 , a low-pass filter 2 , a switched capacitor filter 3 , a PGA circuit 4 , a DSP 5 , an excitation circuit 6 and a general module 7 .

[0050] The sampling circuit 1, the low-pass filter 2, the switched capacitor filter 3, the PGA circuit 4, the DSP 5, and th...

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Abstract

The invention relates to a distribution transformer grounding resistor, current online measurement equipment and a method thereof. The equipment comprises a sampling circuit, a low pass filter, a switch capacitance filter, a PGA circuit, a DSP and an excitation circuit. The sampling circuit, the low pass filter, the switch capacitance filter, the PGA circuit, the DSP and the excitation circuit are sequentially connected. The equipment also comprises a communication interface module or a display interface module. The communication interface module or the display interface module is connected to the DSP. Hardware maximization of the equipment adopts a digital signal processing technology so that a disadvantage of hardware filtering is overcome. The method is a measurement and calculating method which uses a signal processing system formed by the switch capacitance filter, the programmable amplifier (PGA) and the DSP to realize carrying out digital filtering on a sampling signal and calculates an effective value based on a sine wave.

Description

technical field [0001] The invention relates to a measuring device and a measuring method, in particular to an on-line measuring device and method for the grounding resistance and current of a distribution transformer (transformer in a station area). Background technique [0002] A device that can monitor whether the grounding wire is in good contact in real time. It can detect abnormal grounding resistance of distribution transformers in time, inform users of hidden dangers, quickly deal with equipment failures, and prevent accidents. [0003] Some products on the market are not monitored in real time online. Even the equipment with real-time online monitoring generally has large measurement deviations, is greatly affected by temperature, has a small measurement range, and has problems such as inaccurate measurement. [0004] Longyuan's I-generation product can monitor the changes of grounding resistance and current value online in real time. However, this product is design...

Claims

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Application Information

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IPC IPC(8): G01R27/20G01R19/25
Inventor 石自辉董俊法丁国峰
Owner GUODIAN LONGYUAN ELECTRICAL
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