Field Tests on a 345-Kv High-Capacity Oil Circuit Breaker at Philip Sporn Power Plant

1959 ◽  
Vol 78 (3) ◽  
pp. 829-841 ◽  
Author(s):  
Otto Naef ◽  
J. D. M. Phelps ◽  
W. R. Wilson ◽  
A. L. Streater
Keyword(s):  
Power Plant ◽  
Circuit Breaker ◽  
High Capacity ◽  
Field Tests

Field Tests at Grand Coulee Dam on 10,000-Mva 230-Kv Low-Oil-Content Impulse Circuit Breaker

1951 ◽  
Vol 70 (2) ◽  
pp. 1377-1385 ◽  
Author(s):  
A. F. Darland ◽  
C. L. Killgore ◽  
C. J. Balentine ◽  
E. B. Rietz
Keyword(s):  
Oil Content ◽  
Circuit Breaker ◽  
Field Tests ◽  
Grand Coulee Dam ◽  
Grand Coulee

Prevention of Low-Frequency Vibration of High-Capacity Steam Turbine Units

1997 ◽  
Author(s):  
H. Kanki ◽  
Y. Kaneko ◽  
M. Kurosawa ◽  
T. Yamamoto ◽  
Y. Yamamoto ◽  
...  
Keyword(s):  
High Pressure ◽  
High Capacity ◽  
Low Frequency ◽  
Field Tests ◽  
Operating Conditions ◽  
Squeeze Film ◽  
High Pressure Turbine ◽  
Solution Approach ◽  
Vibration Excitation ◽  
Low Frequency Vibration

Abstract The causes of low-frequency vibration (subsynchronous vibration) of a high pressure turbine were investigated analytically and also via vibration excitation tests on actual machines under operation. From the results, it was concluded that low-frequency vibrations may be caused by either the decrease of the rotor system damping or by external forces, such as flow disturbance in the control stage and the rubbing between the rotor and casing. After identifying the cause of the low-frequency vibration, appropriate countermeasures such as installation of a squeeze-film damper and modification of valve opening sequence were taken. Vibration measurements and vibration excitation tests for the high pressure turbine under actual operating conditions were carried out in order to verify the validity of the countermeasures. These field tests confirmed that the problems of low-frequency vibration can be solved completely by taking the appropriate countermeasure depending on the cause of the vibration. This paper presents some field experiences of low-frequency vibration and the effective solution approach.

scholarly journals The novel solution of ball valve with replaceable orifice. Numerical and field tests

2019 ◽  
Vol 9 (1) ◽  
pp. 253-259 ◽  
Author(s):  
Grzegorz Romanik ◽  
Janusz Rogula
Keyword(s):  
Power Plant ◽  
Experimental Verification ◽  
Theoretical Approach ◽  
Field Tests ◽  
Ball Valve ◽  
Numerical Calculations ◽  
Compressed Air ◽  
The Novel ◽  
Measuring Device ◽  
Flow Through

AbstractThe article presents the results of numerical calculations and experimental results of a flow through the orifice. Such a measuring device was built-into the ball valve that gave unique possibility of the orifice exchange without the pipeline disassemble. The advantages of using the prototypical solution has been described. This patented solution has been tested extensively for the durability and tightness. The article contains comparison between flow character in the case of single-hole orifice and a multi-nozzle one. The prototypical measuring device has been produced and assembled in compressed air system in the Power Plant Opole, that gave experimental verification of theoretical approach.

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