Zero-sequence voltage trip protection method for low-voltage side of transformers
A transformer low-voltage side and transformer protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of increased investment in equipment costs, unsuitable protection devices, increased maintenance costs, etc., to achieve increased investment, high reliability, High safety effect
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Embodiment 1
[0040] A zero-sequence voltage tripping protection method adapted to the low-voltage side of the transformer. For the system where the primary neutral point grounding method on the low-voltage side of the transformer is ungrounded, two sets of voltage transformers are arranged on the low-voltage side of the transformer, and zero-sequence overvoltage tripping protection is set. Logic, protection input and protection output are used as a method for grounding protection on the low-voltage side of the transformer; where: when the voltage transformer is configured on the low-voltage side of the transformer as a double set of voltage transformer TV1 and TV2, the transformer protection device is cross-connected to the transformer low-voltage Two sets of voltage transformer star-shaped three-phase secondary windings and open delta secondary winding loops of side voltage transformers, that is, one set of transformer protection devices is connected to voltage transformer TV1 star-shaped t...
Embodiment 2
[0045] A zero-sequence voltage tripping protection method adapted to the low-voltage side of the transformer. For the system where the primary neutral point grounding method on the low-voltage side of the transformer is ungrounded, a single set of voltage transformers is arranged on the low-voltage side of the transformer, and zero-sequence overvoltage tripping protection is set. Logic, protection input and protection output are used as a method for grounding protection on the low-voltage side of the transformer; where: when the voltage transformer on the low-voltage side of the transformer is configured as a single set of voltage transformer TV, the transformer protection device is normally connected to the voltage on the low-voltage side of the transformer Transformer secondary winding and open delta winding circuit; among them, the TV primary disconnection locking discrimination formula is U2 > 0.33*U0zd and 3U0 > U0zd, where U2 is the negative sequence voltage of TV, and 3U0...
Embodiment 3
[0050] A zero-sequence voltage tripping protection method adapted to the low-voltage side of the transformer. For the system where the primary neutral point grounding method on the low-voltage side of the transformer is ungrounded, two sets of voltage transformers are arranged on the low-voltage side of the transformer, and zero-sequence overvoltage tripping protection is set. Logic, protection input and protection output are used as a method for grounding protection on the low-voltage side of the transformer; where: when the voltage transformer is configured on the low-voltage side of the transformer as a double set of voltage transformer TV1 and TV2, the transformer protection device is cross-connected to the transformer low-voltage Two sets of voltage transformer star-shaped three-phase secondary windings and open delta secondary winding loops of side voltage transformers, that is, one set of transformer protection devices is connected to voltage transformer TV1 star-shaped t...
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