Fuzzy parameter measuring method for measuring fluid flow in generator stator bar
Fuzzy parameter measuring method for measuring fluid flow in generator stator bar
 CN 106,871,982 B
 Filed: 02/22/2017
 Issued: 08/07/2020
 Est. Priority Date: 02/22/2017
 Status: Active Grant
First Claim
1. A fuzzy parameter measuring method for measuring fluid flow in a generator stator bar is characterized by comprising the following steps:
 determining key parameters of generator insulating water conduitMeasuring the outer diameter of an insulated water conduit of a cold water pipeline in a generator bar after shutdown by using a vernier caliper to obtain the outer diameter L1 of the insulated water conduit, and recording data, wherein the inner diameter and the wall thickness of the insulated water conduit are difficult to measure on site, so that fuzzy parameter recording is adopted, namely, the inner diameter D1 of the insulated water conduit and the wall thickness D1 of the insulated water conduit which have a certain deviation with an actual value are estimated to be used as initial fuzzy parameters and recorded, the inner diameter D1, the wall thickness D1 and the outer diameter L1 of the insulated water conduit are used as 3 key parameters, and the three parameters meet the formula D1= L12D 1;
secondly, initializing the time difference type ultrasonic flowmeter(1) Inputting 4 nonkey parameters and the 3 key parameters determined in the step one into the instrument one by one under a humancomputer interaction interface of the ultrasonic flowmeter;
the 4 noncritical parameters are respectively;
the type of liquid in the insulating water conduit, the propagation speed of the ultrasound in the liquid in the conduit, the material of the insulating water conduit and the propagation speed of the ultrasound in the material of the conduit wall;
(2) according to the data, determining whether directinjection mode measurement or reflection mode measurement is adopted during testing, and determining the installation distance between the two ultrasonic converters;
thirdly, carrying out flow test on the insulated water diversion pipe by adopting a time difference type ultrasonic flowmeter to obtain fluid flow Q1 in the insulated water diversion pipe;
fourth, data correction(1) Obtaining spare parts of different types of insulating water diversion pipes from a generator manufacturer, and carrying out accurate size parameter test on the spare parts to obtain the true values of 3 key parameters, namely the outer diameter (L2) of the insulating water diversion pipe, the inner diameter (D2) of the insulating water diversion pipe and the pipe wall thickness (D2) of the insulating water diversion pipe;
(2) according to the fuzzy parameter formula correction technology, the fuzzy parameter formula correction technology is implemented by the formula of Q2;
Q1= (L22 ×
d1) (L22 ×
d
2)/(L12 ×
d1)^{2}A final flow value Q2 is calculated and obtained as a final measurement.
Chinese PRB Reexamination
Abstract
The invention relates to a fuzzy parameter measuring method for measuring fluid flow in a generator stator bar, which can effectively solve the problems that key parameters of an insulated water conduit cannot be measured and the error of a test result is caused during field testThe technical scheme includes that key parameters of an insulated water conduit of a generator are determined, a time difference type ultrasonic flowmeter is initialized, a time difference type ultrasonic flowmeter is used for conducting flow test on the insulated water conduit to obtain fluid flow Q1 in the insulated water conduit, data are corrected, and the data are corrected according to a fuzzy parameter formula, wherein Q2, Q1 and (L22 × d1) (L22 × d 2)/(L12 × d1)^{2}Calculating and obtaining a final flow value Q2 as a final measurement result; the invention improves the testing efficiency, shortens the testing time, and can carry out the testing work by fuzzy parameters on the premise of unknown accurate parameters of the insulated water conduit; the testing accuracy can be greatly improved, the testing error is reduced, and the delay of the overhaul period of the unit or unnecessary economic loss is prevented.
1 Claim

1. A fuzzy parameter measuring method for measuring fluid flow in a generator stator bar is characterized by comprising the following steps:

determining key parameters of generator insulating water conduit Measuring the outer diameter of an insulated water conduit of a cold water pipeline in a generator bar after shutdown by using a vernier caliper to obtain the outer diameter L1 of the insulated water conduit, and recording data, wherein the inner diameter and the wall thickness of the insulated water conduit are difficult to measure on site, so that fuzzy parameter recording is adopted, namely, the inner diameter D1 of the insulated water conduit and the wall thickness D1 of the insulated water conduit which have a certain deviation with an actual value are estimated to be used as initial fuzzy parameters and recorded, the inner diameter D1, the wall thickness D1 and the outer diameter L1 of the insulated water conduit are used as 3 key parameters, and the three parameters meet the formula D1= L12D 1; secondly, initializing the time difference type ultrasonic flowmeter (1) Inputting 4 nonkey parameters and the 3 key parameters determined in the step one into the instrument one by one under a humancomputer interaction interface of the ultrasonic flowmeter; the 4 noncritical parameters are respectively;
the type of liquid in the insulating water conduit, the propagation speed of the ultrasound in the liquid in the conduit, the material of the insulating water conduit and the propagation speed of the ultrasound in the material of the conduit wall;(2) according to the data, determining whether directinjection mode measurement or reflection mode measurement is adopted during testing, and determining the installation distance between the two ultrasonic converters; thirdly, carrying out flow test on the insulated water diversion pipe by adopting a time difference type ultrasonic flowmeter to obtain fluid flow Q1 in the insulated water diversion pipe; fourth, data correction (1) Obtaining spare parts of different types of insulating water diversion pipes from a generator manufacturer, and carrying out accurate size parameter test on the spare parts to obtain the true values of 3 key parameters, namely the outer diameter (L2) of the insulating water diversion pipe, the inner diameter (D2) of the insulating water diversion pipe and the pipe wall thickness (D2) of the insulating water diversion pipe; (2) according to the fuzzy parameter formula correction technology, the fuzzy parameter formula correction technology is implemented by the formula of Q2;
Q1= (L22 ×
d1) (L22 ×
d
2)/(L12 ×
d1)^{2}A final flow value Q2 is calculated and obtained as a final measurement.

Specification(s)