Debugging method of phase sequences of loops at two sides of synchronization point before commissioning of generator set

Abstract

The invention discloses a debugging method of phase sequences of loops at two sides of a synchronization point before commissioning of a generator set. Before first synchronization grid connection of the generator set, the corresponding relation between primary phase sequences and secondary phase sequences at the two sides of the synchronization point, the primary phase sequence at the two sides of the synchronization point and the secondary phase sequences at the two sides of the synchronization point are detected and debugged by a protector debugging instrument, a phase sequence meter and a universal meter under a 380-V low-voltage power supply, a power-grid-side high-voltage power supply or a generator self-generating electricity accessing state. According to the debugging method of the phase sequences of the loops at the two sides of the synchronization point before the commissioning of the generator set, the phase sequences on a synchronization voltage miniature bus can be guaranteed to be real reflection of primary loops, the phase sequences of the primary loops at the two sides of the synchronization point and secondary voltage comparison loops are adjusted to be coincident in an unmistakable manner, the serious injury brought by non-synchronization grid connection caused by different phase sequences is avoided; and the condition that the grid connection cannot be carried out because the phase sequences are detected to be inconsistent after the impulse starting of the generator is avoided, and the accuracy, reliability and safety of the grid connection of the generator set are guaranteed.

Description

technical field [0001] The invention relates to a debugging method before a generator set is put into operation, in particular to a method for debugging the phase sequence of circuits on both sides of a synchronous point before the generator set is put into operation. Background technique [0002] For the newly put into operation, before the first grid connection, the phase sequence, voltage and frequency of the primary circuits on both sides of the synchronous point must be the same, and the voltage phase angle difference shall not exceed 20° before grid connection operation. The synchronous voltage on both sides of the synchronous point is the AC voltage after the transformation of the voltage transformer (PT) and the switching of the secondary circuit, which is led to the corresponding small busbar of the synchronous voltage. Before performing synchronous grid-connection operation, the phase sequence detection of the voltage signals of the synchronous voltage small buses ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an accurate adjustment of the phase sequence on both sides of the synchronous point once and twice before the generator set is connected to the grid for the first time synchronously in view of the defects and potential safety hazards of the current phase sequence detection method A consistent phase sequence detection and debugging method

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