Grounding line selection alarm correctness verification method based on SCADA data

Abstract

The invention discloses a grounding line selection alarm correctness verification method based on SCADA data. The method comprises the following steps: the SCADA acquires various data in real time; the SCADA retrieves whether a bus grounding signal exists or not, and if so, whether the bus grounding signal comes from a first bus grounding signal sent by a transformer substation small current grounding line selection device or a second bus grounding signal calculated by the SCADA itself is judged; if the bus grounding signal is the first bus grounding signal, the SCADA retrieves a self grounding judgment condition within a first preset time when the first bus grounding signal is received, and whether the first bus grounding signal exists or not is compared; and if the bus grounding signal is a second bus grounding signal, the SCADA retrieves the received data within a second predetermined time when the second bus grounding signal is received, and compares whether the second bus grounding signal exists or not. According to the invention, the correctness of the grounding line selection signal of the low-current grounding line selection device at the current power plant station end can be verified, so that the accuracy of the grounding line selection alarm of the device is improved, and the device can be improved conveniently.

Description

technical field [0001] The invention relates to a correctness verification method for grounding line selection alarm based on SCADA data, and belongs to the technical field of grounding faults in electric power systems. Background technique [0002] In the actual operation of power system busbars and lines, single-phase or three-phase ground faults often occur, especially in severe weather conditions such as rainy seasons, strong winds and hail, busbars and line grounding faults occur frequently. In addition, small current ground faults caused by small animals and tree barriers also occur frequently. Most of the low-current grounding line selection devices currently used in substations can only be used to detect single-phase ground faults, and there are problems such as device failure and grounding false alarms. For example, when ferromagnetic resonance occurs in the system, the low-current grounding line selection The device may cause false alarms or malfunctions. In addi...

AI Technical Summary

Problems solved by technology

Most of the low-current grounding line selection devices currently used in substations can only be used to detect single-phase ground faults, and there are problems such as device failure and grounding false alarms. For example, when ferromagnetic resonance occurs in the system, the low-current grounding line selection The device may cause false alarms and malfunctions

In addition, the device crashes, the program is stuck, etc., which lead to grounding leakage and false reporting.

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