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What is Transformer Differential Protection Guide about?

The differential protection of the transformer is based on measuring the difference between the input and output currents to detect internal faults. There are different options for setting the trip threshold, such as using a percentage of the restraining current. Buchholz protection detects gases inside the transformer that could indicate a fault when they accumulate in the relay. This protects against internal effects by capturing gas bubbles to activate alarms or disconnect the transformer.

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