A Calibration Method of High Accuracy Fault Indicator

Abstract

The invention discloses a calibration method for a high-precision failure indicator. The calibration method comprises the following steps: (1) building an analog line for a distribution network; (2) clamping the failure indicator on the analog line and calculating the primary calibration coefficient M between each load current sampling value I and the actual current value; (3) achieving secondary calibration of the failure indicator, averaging the output current into 10 groups of interval, and respectively calculating the secondary calibration coefficients k and b of different intervals through the endpoint current values at two ends of each interval and the corresponding load current values subjected to primary calibration; (4) carrying out primary calibration and secondary calibration of the new load current value acquired by the failure indicator. After two times of calibration of the load current value acquired by the failure indicator, the load current value acquired by the failure indicator is greatly improved, the error precision of the load current value is lowered from 5% to 3%, and the load current value acquired by the failure indicator has reference significance on the line running state of the distribution network.

Description

technical field [0001] The invention relates to a fault indicator in an intelligent distribution network, in particular to a calibration method of a high-precision fault indicator. Background technique [0002] The earliest short-circuit fault indicator in China is a closed iron core with an opening that is sleeved on the wire. When the current exceeds the action value, the iron core is closed, and the display rod is unhooked and dropped, indicating that the short-circuit current passes through it. After 1990, the indicator that can reset automatically was introduced in China. After digestion and absorption improvement, it has been widely used in China. According to the development of fault indicator communication in the past two decades, it can be divided into two stages. The first stage is mainly to hook up the fault indicator on the line. The indicator does not have the communication function, and the implementation circuit is relatively simple. Generally, it does not ha...

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Problems solved by technology

However, due to the large dynamic range of the fault indicator (0-1000A), the non-linearity of the iron core material and electronic components, the measurement accuracy of the load current collected by the fault indicator is greater than 5%. The operation status of the grid line is of little reference value

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