The DC screen charging module is the most important external part of the DC screen. Its running head directly determines the operation of the DC screen and even the entire substation system. The large capacity of the DC screen is equipped with a large number of charging modules, and its selection also directly determines the performance of the DC screen in the future. Let us use the case to explain how the charging module of the DC screen should be configured.
Plan formula: The output current of the charging module = 0.1 * C10 + common load + backup, C10 refers to the normal battery 10 hours of discharge (general DC screen is produced according to 10 hours of discharge).
Example 1, a 10KV high-voltage switch station, a total of 15 high-voltage switchgear with vacuum circuit breakers, using 100AH ​​DC screen, how many A modules are suitable. How many do you need?
Pre-calculation: The DC screen floating charge that is not often AC power outage can select about 0.05 times the battery capacity. Then the 100AH ​​DC screen can select 100*0.05=5A module. If the power is cut off frequently, it is reasonable to use 0.1 times capacity. , that is, 100*0.1=10A
1. If a 5A module is used, according to the above formula, at least three 5A modules are required. When two 5A modules are charged, a 5A module is used as a spare module, and a common load is required according to the situation. Module (such as the common load current is 3A. Then with a 3A module)
2. If a 10A module is used, it is necessary to have two 10A modules, one for charging, one for standby, and one module for common load.
This is only to select the DC screen module according to the discharge capacity of 10 hours. In the specific case, it is necessary to look at the delay power supply time of the DC screen. For details, please click "How to calculate the DC screen delay power supply time" Come understand.
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