Transient quantity and medium resistance fused small current grounding line selection tripping method and system
A low-current grounding, transient technology, used in electrical components, emergency protection circuit devices, short-circuit testing, etc., can solve problems such as the need for further research on coordination logic, differences in transient methods, etc., to improve the reliability of power supply, reduce Risk of fire, effect of high reliability
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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the following in conjunction with the attached figure 1 The present invention will be further described in detail with specific embodiments. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0028] The present invention proposes a small current grounding line selection tripping method in which the transient quantity and the medium resistance are fused, such as figure 1 As shown, it includes three main links of line selection tripping by transient quantity method, line selection tripping by medium resistance method and wheel cut and the corresponding reclosing link.
[0029] 1. First, judge the bus zero-sequence voltage U 0 Whether it is greater than the set threshold, if it is less than the threshold, there is no fault and continue to operate normally; if the bus zero-sequence voltage is greater th...
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