110KV one-battery one-charger DC system replacement method without power cut

Abstract

The invention provides a 110KV one-battery one-charger DC system replacement method without power cut. The method comprises a step of connecting a 1# temporary storage battery pack with a 2P DC feed cabinet, wherein the 1# temporary storage battery pack is taken as a backup power supply for a 1P DC charging cabinet and the 2P DC feed cabinet, a step of remove a 3P DC storage battery cabinet I anda 4P DC storage battery cabinet II, a step of install a new DC charging cabinet at the position of the original 4P DC storage battery cabinet II and installing a new 1# DC feed cabinet at the positionof the original 3P DC storage battery cabinet I, a step of connecting a 2# temporary storage battery pack to the new DC charging cabinet, wherein the 2# temporary storage battery pack is used as a backup power supply for the new DC charging cabinet and the new 1# DC feed cabinet, a step of transferring the load of the 2P DC feed cabinet to the new 1# DC feed cabinet, and a step of installing a 2#DC feed cabinet at the position of the original 2P DC feed cabinet. According to the 110KV one-battery one-charger DC system replacement method without power cut, the new DC system can be installed at the original position without power cut, a bridge system which is a temporary DC system is omitted, therefore, the new system is directly installed as a substitution, a lot of manpower and materialresources are saved, the grid risk is reduced, and the time of power cut is reduced.

Description

technical field [0001] The invention relates to the technical field of substation DC systems, in particular to a method for replacing a 110KV one-power-charge DC system without power failure. Background technique [0002] 1. Replacement method of the existing 110kV substation one-charge-one-feed DC system: [0003] So far, in the transformation process of the DC system of the 110kV substation of the power system, the current method is adopted for the replacement of the DC system under the condition of no power failure, that is, a set of temporary DC system C: including three Part: Temporary DC system feeder cabinet, temporary battery pack, temporary DC system charger, as a bridge system, transfer the load of the existing DC system A to the temporary DC system C, and remove the existing DC system A after confirming that the load transfer is successful , install and debug the new DC system B, then transfer the load of the temporary DC system C to the new DC system B, remove t...

AI Technical Summary

Problems solved by technology

[0008] 2.4. The current overall replacement method needs to use 6 steps, such as Figure 4 shown

[0017]3.1 Risks:

[0018] (1) Operation risk: During the replacement process of the one-charge one-feed DC system, the temporary DC system feeder cabinet, temporary battery pack, and temporary DC system charger are all in a state of losing monitoring. If the DC system is grounded (or other DC system faults), the temporary DC system of the substation cannot alarm, and the operation and maintenance department and dispatch monitoring center cannot monitor and find faults in time

[0019] (2) Power grid security risk: In the process of replacing one power, one charge, one feed DC system, a total of two load transfers are required. First, the load is transferred from system A to system C, and then from system C to system B. The number of transfers The more risks, the greater the risk. In the process of each transfer, there will be hidden dangers of four-level power grid risks, which will easily cause large-scale power outages. Therefore, the fewer transfers, the safer

[0023] (3) Time cost: during the replacement process of the DC system of one power, one charge and one feed, due to the need to transfer two loads, the construction is carried out according to the existing method, and the construction time is about 10 days

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