Technical parameters;
Test transformers YDJ-3KV/50KV, YDJ-5KV/50KV, YDJ-10KVA/50KV, one each, all with cascade windings.
Voltage 50KV/200V
It is required to configure 1 operation console, 2 insulating supports, power cables and measuring wires.
From these technical parameters, we can see that the three test transformers are of the same voltage level but different capacities. So the question is: how high can the total voltage of these three cascade test transformers rise, and what should be the total capacity of the operation console?
Below we can discuss some related issues about cascade transformers:
What are the advantages of cascade test transformers?
Cascade test transformers are small in size, light in weight, and easy to carry and transport. For test transformers of high voltage levels, they are more economical and simpler in structure. Since the cascade is composed of multiple single test transformers, it can be boosted individually, avoiding the awkward situation where the whole set cannot be used if one fails.
The wiring of cascade test transformers is shown in the figure below:
When two test transformers are used in cascade, the capacity ratio of the first stage to the second stage is 2:1, the total capacity is the capacity of the first stage, and the total voltage is the sum of the maximum output voltages of the two test transformers. Then the output current is the ratio of total capacity to total voltage. For example: when a 5kVA/50kV and a 3kVA/50kV test transformer are used in cascade, the total capacity is 5kVA, the total voltage is 100kV, and the output current is 5kVA/100kV, which is 50mA.
When three test transformers are used in cascade, for example, the above models are 10kVA/50kV, 5kVA/50kV, and 3kVA/50kV, then the capacity ratio of the three is 3:2:1, the total capacity is also the capacity of the first stage test transformer, which is 10kVA, and the total voltage is the sum of the voltages of the three test transformers, that is, the total voltage output is 150kV.
Therefore, the above question can be clearly answered. Since all three are test transformers of the same 50kV voltage level, the total voltage is the sum of the output voltages of the three test transformers, which is 150kV. And the capacity follows the 3:2:1 relationship. Then the total capacity is the capacity of the first stage test transformer, and the operation console is consistent with the capacity of the whole system, so the operation console should be configured with 10kVA, the same capacity as the first stage test transformer.
However, we need to note that whether it is a two-stage or three-stage cascade, the output current is strictly prohibited from exceeding the rated current of the last stage.
In summary, we can remember it like this:
For cascade test transformers, the voltages of each stage must be consistent.
For two-stage cascade, the capacity ratio is 2:1; for three-stage cascade, it is 3:2:1.
The total voltage is the sum of the voltages, and the system capacity is determined by the first stage.
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