String complement capacitance transmission line distance protecting method based on model recognition
A technology of model identification and distance protection, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of low protection sensitivity, destroy the linear relationship between transmission line impedance and distance, etc., to improve sensitivity and overcome the influence of distance protection. Effect
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[0022] Referring to Figure 1, a protection device is provided at the M end of the line. The protection device measures the three-phase voltage and current at the M end of the line through a voltage transformer TV and a current transformer TA, and passes the analog measurement value through a low-pass filter, sample holder and After the A / D converter, it is sent to the microcomputer processor (DSP), and the microcomputer processor transmits the judgment result to the relay through the photoelectric isolator to perform the corresponding protection action.
[0023] Refer to Figure 2, which is a diagram of the fault model before the series compensation capacitor. There is an equation for a single-phase (take A phase as an example) ground fault u Am = R ( i Am + k R i m ...
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