Method and system for low oil pressure guide vane closing experiment in hydroelectric generating set accident

Abstract

The invention relates to a method and a system for a low oil pressure guide vane closing experiment in a hydroelectric generating set accident. The invention has the advantages of simple and convenient method, more accurate time control, avoidance of mistake shutdown of the hydroelectric generating set and the like. The method comprises the following steps of: before doing the experiment after starting the hydroelectric generating set, additionally arranging one or more temporary switches K in a circuit of the accident shutdown pressure, wherein the switches K are in normally-open states; after the unit is provided with the load needed by the experiment, discharging oil and gas until the accident shutdown pressure switch PT just act and then applying for an on-duty dispatcher for doing the experiment; and after the dispatcher assigns an instruction of starting doing the experiment, closing the switch K, receiving an action signal of the pressure switch PT, sending a shutdown instruction and enabling the hydroelectric generating set to be shut down by a control system of the hydroelectric generating set.

Description

technical field [0001] The invention relates to a test method and system for shutting down a guide vane at low oil pressure in a hydroelectric generator set accident. Background technique [0002] The test method for the existing hydro-generator set (including conventional hydroelectric unit and pumped storage unit) to close the guide vane due to low oil pressure in an accident is: when the hydro-generator set generates power with the load required for the test, it must be reported to the power grid dispatching center for approval. Next, switch the oil pressure device of the speed control system to the manual state, and reduce the pressure of the pressure oil tank to the shutdown pressure P through manual exhaust and oil discharge. T +ΔP(0MPa<ΔP<1MPa), when the on-duty dispatcher of the power grid dispatching center gives the test order, continue to discharge oil and exhaust to the emergency shutdown pressure P T , the control system receives pressure switch P T Afte...

AI Technical Summary

Problems solved by technology

[0003] There are some problems with this test method: unit load reduction and disconnection need to be approved by the on-duty dispatcher

If you apply to enter the test before the start of oil discharge and exhaust, it will take a long time to drain the oil and exhaust to reach the oil pressure of the emergency shutdown after the dispatcher issues the decommissioning shutdown command, which is not conducive to the dispatcher's understanding of the operation of the power grid It is easy to cause uncontrollable disturbance to the power grid if it is controlled; if the oil is exhausted in advance, there is a possibility of malfunction and shutdown, which will affect the normal operation of the test site and cause unnecessary disturbance to the power grid

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