Current calculating method for low power consumption of fault indicator

Abstract

The invention discloses a current calculating method for the low power consumption of a fault indicator. The method comprises the following steps: setting a CPU (Central Processing Unit) of an indicator to be in a sleep mode, and setting to delay for 3000ms and activating the CPU; after the completion of the sleeping delay time, switching the CPU into an activating mode from a sleeping mode; performing sampling and AD (Access Device) conversion; collecting 20 AD numerical values by a cycle wave every 1ms; detecting whether the data acquisition of the cycle wave is completed, and performing once sampling, keeping, AD conversion and numerical value memory after delaying for 1ms if the data acquisition is not completed; and adopting a complete cycle integral method to calculate the needed current numerical value. According to the current calculating method, the CUP activating time takes less than 1% of the time of the whole operating cycle, and the operating power consumption is almost equivalent to the sleep power consumption of the CPU; furthermore, the current acquisition precision is high, and the complete cycle integral method with little operand can be adopted to realize current calculation with high precision under the condition of very low power consumption.

Description

technical field [0001] The invention relates to the technical field of a fault indicator for current monitoring on a power line, in particular to a low power consumption current calculation method for a fault indicator. Background technique [0002] With the development of our country's economy, the distribution network has been paid more and more attention, and the requirements for the safe operation of the distribution network are also getting higher and higher. The 10kV distribution network is characterized by a wide area, a large area, and many line branches. For a long time, the operation management level and monitoring means of the 10kV distribution network are relatively low. If FTU or DTU is installed in a large area to monitor the distribution network, although the monitoring means and operation management level of the distribution network can be improved, the cost will be difficult. It is not necessary in the C-type, D-type, and E-type load areas. In the broad cl...

AI Technical Summary

Problems solved by technology

In order to accurately monitor the line current, according to the relevant regulations of remote monitoring, the current collection accuracy of the indicator is required to be within ±3%. At present, the current collection accuracy of many indicators is not high, within ±5%.

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