A method of inverse-time zero-sequence overcurrent grounding protection for small-resistance grounding systems based on lateral coordination of each outlet protection
A low-resistance grounding and grounding protection technology, used in emergency protection circuit devices, automatic disconnection emergency protection devices, electrical components, etc., to achieve the effect of wide application range, good selectivity, and high engineering application value
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[0037]To achieve the above object, the present invention can be realized by the following technical solutions:
[0038] I, because the starting current setting value in the protection scheme proposed by the present invention is set to 3~10A during normal operation, if the system adopts the method of three-phase current transformer secondary side output synthesis to obtain the zero-sequence current, it may occur The setting value of the protection is less than the unbalanced current generated when the three-phase load is unbalanced, causing the protection to malfunction. When zero-sequence current transformers are used in the system, the unbalanced three-phase load will not affect the normal operation of the protection, that is, the present invention is more suitable for the situation of using zero-sequence current transformers to obtain zero-sequence current. combine Figure 1~4 And Tables 1-3, a specific working process of a high-sensitivity inverse-time zero-sequence overcu...
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