What are the three major conditions for closed loop operation?

The conditions are: 1. The phases of the loop closing points should be consistent, and the voltage difference and phase angle should meet the regulations; 2. For the operation of more complex ring networks, calculation or verification should be performed first, and relevant information should be used before and after the operation. 3. It should be ensured that the power flow changes in the closed loop network do not exceed the limitations of power grid stability, equipment capacity, etc.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

1. The phases of the loop closing points should be consistent. If the phase change may occur after the first loop closing or maintenance, it must be measured to prove that the phases on both sides of the loop closing point are consistent;

2. If it is an electromagnetic ring network, the difference in the wiring groups of the transformers in the ring network is zero; under special circumstances, after calculation and verification, the relay protection will not malfunction and the relevant loop equipment will not be overloaded, and the loop closing operation is allowed when the transformer wiring difference is 30°;

3. It will cause overloading of various components in the ring network;

4. The voltage of each bus bar should not exceed the specified value;

5. Relay protection and safety automatic devices should adapt to the ring network operation mode;

6. The power grid is stable and meets the specified requirements.

Also note that during the loop closing operation, it must be ensured that the phases on both sides of the loop closing point are the same, and the voltage difference and phase angle should comply with regulations; it should be ensured that the power flow changes in the loop closing network do not exceed the stability of the power grid and the equipment capacity. Due to restrictions in other aspects, for the operation of more complex ring networks, calculation or verification should be performed first, and relevant parties should be contacted before and after the operation.

There are not many advantages to running the two lines in a loop for a long time. In many cases, two lines operate in a loop in order to smoothly "reverse", that is, supply power from one line to another line.

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