A Protection Method for Closed-loop Operation of Distribution Network
A closed-loop operation and distribution network technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as the disappearance of the advantages of closed-loop operation of the distribution network, the complex setting of the optical fiber longitudinal differential protection, and the tripping of the outgoing switches of the double-sided substations.
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Embodiment 1
[0023] Such as image 3 , The typical wiring of the distribution cable network starts from the outlet switches CB1 and CB2 of the same low-voltage bus in the substation, and the closed-loop power supply range involves the power distribution room 1-5. Each power distribution room is equipped with a set of protection devices, which are respectively protection devices 1-5. Each set of protection devices and substation outlet switches CB1 and CB2 are connected through a point-to-point optical fiber communication channel to realize millisecond-level real-time high-fidelity redundant communication. fast exchange of status and fault information; MB1, MB3, MB4, MB6, MB7, MB9, MB10, MB12, MB13, and MB15 are respectively the trunk incoming and outgoing switches of the power distribution room; MB2, MB5, MB8, MB11, and MB14 are respectively Branch line switch in the electric room.
[0024] Assuming the worst case of a fault at the end of the closed-loop line of the distribution network, ...
Embodiment 2
[0027] As in Example 1, about image 3 distribution network wiring, communication system and protection configuration.
[0028] Such as Figure 5 , when the fault occurs between MB4 and MB6 in power distribution room 2, CB1, MB1, MB3, and MB4 detect the fault current in the forward direction, and MB6, MB7, MB9, MB10, MB12, MB13, MB15, and CB2 detect the fault in the reverse direction current; MB2, MB5, MB8, MB11, MB14 did not detect the fault current; through the state and fault information exchanged by point-to-point high-speed optical fiber communication, MB3 learned that the adjacent MB1 and MB4 also detected the fault current in the positive direction. The fault current information in the direction of the adjacent belt judges that the fault is outside the main area, and does not act; similarly, MB4 knows that the adjacent MB3 detects the fault current in the forward direction, but MB6 detects the fault current in the reverse direction. The current information judges that...
Embodiment 3
[0030] As in Example 1, about image 3 distribution network wiring, communication system and protection configuration.
[0031] Such as Figure 6, when the fault occurs in the MB5 branch line of power distribution room 2, CB1, MB1, MB3, and MB4 detect the fault current in the forward direction, MB6, MB7, MB9, MB10, MB12, MB13, MB15, and CB2 detect the fault current in the reverse direction; MB5 Fault current is detected, MB2, MB8, MB11, and MB14 do not detect fault current; through point-to-point high-speed optical fiber communication to exchange status and fault information, MB3 knows that adjacent MB1, MB4 also detects fault current in the positive direction, according to The fault current information of the adjacent belt direction judges that the fault is outside the backbone area, and does not act; although MB4 knows that the adjacent MB3 detects the fault current in the forward direction, and MB6 detects the fault current in the reverse direction, MB5 also detects the fa...
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