Assertion: wicket gate | /r/HasProperty | closed in both of the above cases
Facets:
Source sentences:
text: In both of the above cases, the wicket gates should be closed (preferably, rapidly closed) when it is detected that the relation ∂Q 1 /∂N 1 >0 is reversed to ∂Q 1 /∂N 1 >0 after the tracing down along the S-curve has been completed (i.e., when it is detected that the pump-turbine operation escaped from the S-section), so that the tracing on the S-section will never be experienced in the swing-back process in the Q 1 -increasing direction by preventing ∂Q 1 /∂N 1 <0 to take positive values owing to the dynamic modification effect on the S-curve caused by the closing motion.