Self-adaptive distance protection method for double-circuit line of intelligent substation
A smart substation and distance protection technology, which is applied to emergency protection circuit devices, electrical components, etc., can solve problems such as lack of sensitivity, short distance between two circuits, and cross-lines
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[0023] 1. Electric quantity information collection
[0024] Collect the six-phase voltage of two circuits at the same time with Six-phase current with And the position information of the six-phase switch and the position information of the grounding switch of the two-circuit line. figure 1 It is a schematic diagram of 500kV intelligent substation double-circuit outgoing line protection configuration.
[0025] In the figure, 1. Adjacent line sampling value, 2. Switch information volume, 3. GOOSE (General Object Oriented Substation Event) network, 4. SMV (Sampling Value) network, 5. Current combining unit, 6. Intelligent unit, 7. Voltage merging unit, 8. Line I, 9. Line II, 10. Switch, 11.ECT (electronic current transformer), 12. EVT (electronic voltage transformer), 13. PSL600U line protection device.
[0026] Among them, sampling value and protection trip command adopt point-to-point transmission mode, and other switch information adopts GOOSE network transmission.
[0027] 2. Jud...
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