Signal distance protection method of direct current power transmission line
A technology for DC transmission lines and distance protection, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as large amount of calculation and complex algorithm, and achieve the effect of overcoming poor reliability and simple method.
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[0029] Such as figure 1 As shown, the system structure diagram of the bipolar HVDC transmission line. The protection and measuring devices at both ends of the DC line monitor the current and voltage at both ends of the line in real time, and exchange data information through inter-station communication.
[0030] Such as figure 2 As shown, the schematic diagram of the signal distance protection configuration. When the signal distance protection starting element meets the conditions, the signal distance main protection starts, if the signal distance degree Δ zn (τ) reaches the protection setting value Δ znset3 , the protection will act reliably; otherwise, the protection will not act reliably.
[0031] Such as image 3 As shown, the flow chart of the method for signal distance protection is realized. The protection measurement device installed at both ends of the DC line collects real-time data. After the signal distance protection is started, the DC protection device cal...
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