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Differential protection of dry-type transformer

time:2021/2/2   source:华天电力  reading:307 time

There are many types of dry-type transformer protection. For dry-type transformer protection, there is a type of protection called differential protection, which is an important way to protect the transformer from various failures and losses. The differential protection of dry-type transformers is more precise. As long as there are dangerous signals or unfavorable factors to current and voltage, it will cut off the power supply and issue a warning. This is its main feature and also more important. A type of protection.


For transformer equipment, the differential protection of a dry-type transformer is the main protection of the transformer, which is installed according to the principle of circulating current. Transformer differential protection is mainly used to protect various phase-to-phase short-circuit faults that occur within the windings of dual-winding or three-winding transformers and their lead wires, and it can also be used to protect transformer single-phase inter-turn short-circuit faults.


Hipot Test Set (Dry Type).png


Current transformers are installed on both sides of the winding transformer, and the secondary side is wired according to the circulating current method, that is, if the same-level ends of the current transformers on both sides are facing the bus side, the same-level terminals are connected, and the Connect a current relay in parallel between the two wires. The current flowing in the relay coil is the secondary current difference of the current transformers on both sides, which means that the differential relay is connected to the differential circuit. The scope of transformer differential protection is the electrical equipment between the current transformers that constitute the transformer differential protection, and the wires connecting these equipment. Since the differential protection does not act on faults outside the protection zone, the differential protection does not need to cooperate with the adjacent component protection outside the protection zone in the action value and action time limit, so it can act instantaneously when the fault occurs in the zone.


The differential protection of dry-type transformers is the most accurate one of all the protections. Because the differential protection of dry-type transformers is basically protected by various parts of it, because of the differential protection of dry-type transformers There are many types, complicated work, and relatively accurate, which has become a relatively important type of protection for installation.

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