Generator set slow machine halt trouble discrimination method

Abstract

The invention discloses a method for determining the slow halting failures of a motor and includes the following three criterions which are satisfied simultaneously: (1) a slow starting element adopts a power descending speed as the slow starting condition for recording the power value of a machine set which runs in a steady state, and the power descending speed of the machine set exceeds a constant threshold value of the power descending speed; (2) a descending amount condition of the slow halting power is that after the slow starting condition is satisfied, the invention compares the power value of each point of the machine set with P jz-00, if the descending amount is larger than a constant value Delta P set in a specified time period Delta T set, the invention determines that the machine set has the slow halting which relates to non-electric failures after confirming a plurality of continuous points; (3) an auxiliary criterion using frequency and voltage uses frequency or voltage change amount, that is Delta f is larger than or equal to SET Delta f or Delta U is larger than or equal to SET Delta U, is taken as the auxiliary criterion for determining the slow halting of the machine set.

Description

1. Technical field [0001] The invention relates to a method for judging generator non-electrical failure shutdown, that is, a method for discriminating generator slow shutdown, capable of judging the generator slow shutdown failure caused by abnormalities in the prime mover system and the like. 2. Background technology [0002] For large-scale and small-grid power systems (Hainan, Xinjiang, Tibet, etc.) or power grids in small-capacity areas, if there is an emergency shutdown of a high-power unit inside or a large power drop in a short period of time, the frequency of the regional power grid may be caused. Or the voltage drops seriously, and it is necessary to quickly remove a certain capacity of regional loads to restore the system frequency or voltage to normal as soon as possible, so as to avoid frequency or voltage instability in the regional power grid. Therefore, it is very important to correctly and quickly judge the emergency shutdown and rapid power drop of these un...

AI Technical Summary

Problems solved by technology

At present, the electrical quantity criterion for judging short-circuit faults of generators is relatively mature, and such faults can be quickly judged; The time is usually between 0.3 seconds and 0.5 seconds), due to the slow change process of electrical quantities, it is impossible to judge according to the usual characteristics of electrical quantity changes. At present, there is no accurate identification method for unit failures in this case

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