During the peak summer season, the cooling load is large, and the line and main transformer heavy overload conditions occur. Today, we will talk about several methods to solve the heavy overload.
1. Three methods for handling main transformer heavy load in 220 kV substation
1. Transferring subordinate 110 kV substation load is the most effective means
If the incoming line power of the subordinate 110 kV substation is not only from the 220 kV substation, it can be transferred to other 220 kV substations. The precondition is that the other 220 kV substation load does not experience heavy overload. The 110 kV D substation can be powered by the 220 kV B substation via the D2 line, thereby reducing the 220 kV A substation load.
2. Transfer of 220 kV substation 10 kV outlet load effect is limited
Assuming that a 220 kV substation has a 10 kV outlet load, it can be considered to transfer to an adjacent substation through a 10 kV outlet load. The precondition is that the adjacent substation is not powered by this 220 kV substation. Otherwise, it takes no sense to get from the left hand to the right hand.
However, the ability to transfer loads through a 10 kV outlet is limited. This method can be used as an alternative.
3. Adjust the connection line to a special operation mode to reduce the power supply load, but increase the grid risk
Assume that there is a 110 kV AB tie line between the 220 kV A substation and the 220 kV B substation. It can be considered to reduce the load on the A substation by transferring part of the load to the 110 kV A substation 110 kV bus on the 110 kV AB tie line.
However, this method is used with caution, which will cause the 110 kV busbar of the A substation to be a special operation mode. The 110 kV 1 mother is the partial load for the transfer, the 110 kV 2 is the remaining 110 kV outlet load, and the 110 kV bus 112 is the hot spare.
All are single busbar wiring. If any 110 kV busbar trips, an external power outage will occur, causing a grid risk event.
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