LEAMAN B PODOLSKY
Engineers in Wilmington, DE

4418285, Nov 29, 1983

Dec 30, 1977

5/866150

Leaman B. Podolsky - Wilmington DE
Uri G. Ronnen - Monroeville PA
Francesco Lardi - O'Hara Township, Allegheny County PA

Westinghouse Electric Corp. - Pittsburgh PA

F01B 2500

290 40R

A system and method for operating a turbine power plant, wherein a demand signal based upon load or total turbine steam flow required for a predetermined level of operation controls the value of individual signals representative of valve position for respective steam inlet valves in the single and sequential mode of operation, is disclosed. Each individual valve position signal, which is representative of a selected portion of the total demand signal, is dynamically calculated to reflect the effect of the pressure drop across the nozzles, and to correct for the number of inlet nozzles, associated with each valve. The total demand signal is modified in accordance with actual throttle pressure over a period of time that is dependent on the amount of throttle pressure change.

4270055, May 26, 1981

Dec 30, 1977

5/866155

Uri G. Ronnen - Monroeville PA
Leaman B. Podolsky - Wilmington DE
Theodore C. Giras - Pittsburgh PA

Westinghouse Electric Corp. - Pittsburgh PA

H02P 904

290 40R

A system and method of operating a turbine power plant utilizing a digital computer to transfer automatically between a single valve mode and sequential valve mode of operation and vice versa without disturbing the load or steam flow demand to the turbine, is disclosed. Selecting the other mode of valve operation when operating automatically in one valve mode results in the generation of physical representations corresponding to the desired flow through each of the valve means in such other mode at the operating load or flow level. The flow in the one mode and the desired flow in the other mode is used to generate a representation based on flow change for each valve means. A number of increments of valve flow change for each valve means is determined in accordance with the largest valve flow change and a predetermined limit. The size of each incremental change is determined in accordance with the respective valve flow change. The position of the appropriate valves are changed simultaneously at periodic time intervals to change the flow at each interval corresponding to its respective incremental flow change until the turbine is operated in the selected mode.

3931500, Jan 6, 1976

Nov 13, 1973

5/415869

Gary W. Berkebile - Pittsburgh PA
Francesco Lardi - Pittsburgh PA
Leaman B. Podolsky - Wilmington DE

Westinghouse Electric Corporation - Pittsburgh PA

G06f 1556, F01b 2500

23515121

A combined digital computer/analog control system for operating a boiling water reactor steam turbine power plant, wherein the digital computer provides a throttle pressure setpoint, speed error and load demand for controlling the plant depending upon the operational states of the system, is disclosed. The analog portion of the system also controls the plant in cooperation with the digital computer for certain operational states and conditions when the digital computer is in operation; and the analog system alone controls the plant when the digital computer is out of service. The transfer between such control is effected depending upon the operational states of the system and certain of the components therein. The system also includes in the digital computer portion, the provision for preventing a load demand which is outside the limits of the reactor circulation system when the reactor is in a state of automatic operation.

4471446, Sep 11, 1984

Jul 12, 1982

6/397260

Leaman B. Podolsky - Wilmington DE
Thomas H. McCloskey - Palo Alto CA
Morton H. Binstock - Pittsburgh PA

Westinghouse Electric Corp. - Pittsburgh PA

F01K 1302

364494

A DEH (digital electrohydraulic) control system for a steam turbine generator having a steam bypass system. The turbine system includes a high pressure turbine having throttle and governor steam admission valves as well as an intermediate pressure turbine having stop and interceptor steam admission valves. The turbine is brought on line by initially controlling steam admission into the intermediate pressure turbine by modulating the interceptor valve in response to a speed error signal generated as a result of the difference between actual and a predetermined reference speed. During this initial control the throttle valve remains in a closed position. When the turbine speed has attained a preset value such as half of synchronous speed, the interceptor valve is held at the same position it was in when the preset speed was attained and the throttle valve is controllably open in response to the same speed error signal. After a preset transfer speed has been attained, control of steam admission to the high pressure turbine is transferred to the governor valve and after synchronous speed has been reached the DEH system switches to a load control mode wherein the signal which controls the positioning of the governor valve is also utilized to control the interceptor valve position. The interceptor valve thereafter will reach a wide open position at a predetermined load.

3956897, May 18, 1976

Jan 27, 1975

5/544604

William E. Zitelli - Media PA
Leaman B. Podolsky - Wilmington DE

Westinghouse Electric Corporation - Pittsburgh, PA

F01K 1302

60660

A digital transfer system for transferring the operation of a steam turbine between a single and sequential mode of operation is disclosed. A total flow demand signal is applied to all of the valves in parallel for the single mode; and applied to all of the valves through individual function generators for the sequential mode. A digital up/down counter is connected to a rate multiplier for generating pulses at a frequency corresponding to the status of the counter. An electronic switch is connected to conduct either the single or sequential mode signal to the valve operating mechanism to respond to the pulses for repetitively applying alternately the single and sequential mode signal during the transfer. Digital components both control and are controlled by the counter to increase incrementally the frequency of operation of the electronic switch to apply the particular signal toward which the transfer is being made at such increasing frequency during the first portion of the transfer period and to incrementally decrease the operating frequency of the switch and apply the particular signal from which the transfer is made during the final portion of the transfer. Provision is made to adjust the period of transfer; and to stop or reverse the transfer between modes at any period during the transfer.

4025765, May 24, 1977

Aug 10, 1973

5/387578

Theodore C. Giras - Pittsburgh PA
Leaman Podolsky - Wilmington DE

Westinghouse Electric Corporation - Pittsburgh PA

G05B 1500, G06F 1506, G06F 1556

23515121

A steam turbine control system includes an operator panel and a digital computer which operates the turbine valves through an electrohydraulic control. Turbine speed and load signals and valve position signals are coupled to the computer for use by the computer control loops in developing valve control signals. Two separate displays are provided on the operator panel, one for the speed or load reference and the other for the speed or load demand. Dedicated pushbuttons on the panel enable certain other parameters such as acceleration or load rate or valve position limit to be displayed in the reference display, while other pushbuttons can be used to address and display in the reference or demand display general control system parameters. A mechanism is provided for entering changes into the computer for the various parameters and for displaying such changes in one of the displays.

4448026, May 15, 1984

Sep 25, 1981

6/305813

Morton H. Binstock - Pittsburgh PA
Thomas H. McCloskey - Palo Alto CA
Leaman B. Podolsky - Wilmington DE

Westinghouse Electric Corp. - Pittsburgh PA

F22B 3500

60662

A steam turbine system which includes a steam generator and a steam bypass path for bypassing steam around the turbine. The outlet throttle pressure of the steam generator is controlled by controlling admission of steam into the bypass path by means of a bypass valve. A desired throttle pressure set point is generated which is independent of steam flow and this set point is compared with the actual throttle pressure for governing the bypass valve during turbine start-up. When the turbine is fully operational the bypass valve control is effected by a comparison of the actual throttle pressure with the desired throttle pressure set point plus some bias.

4088875, May 9, 1978

Nov 4, 1975

5/628629

Leaman B. Podolsky - Wilmington DE
Charles L. Groves - Willingboro Township, Burlington County NJ
Steven J. Johnson - Pittsburgh PA

Westinghouse Electric Corp. - Pittsburgh PA

F01D 1700

364494

A system for indicating optimum positioning of steam inlet valves to minimize steam throttling losses during operation of a turbine power plant in the sequential valve mode is disclosed.

4455836, Jun 26, 1984

Sep 25, 1981

6/305814

Morton H. Binstock - Pittsburgh PA
Thomas H. McCloskey - Palo Alto CA
Leaman B. Podolsky - Wilmington DE

Westinghouse Electric Corp. - Pittsburgh PA

F01K 722

60663

A bypass system for a steam turbine wherein the temperature of the steam bypassed around the high pressure turbine is accurately controlled by measuring the inlet and outlet temperatures of the boiler reheater and generating an adaptive set point. The set point value is used to govern operation of a spray valve which admits cooling water to the bypass steam path.

4053745, Oct 11, 1977

Nov 12, 1975

5/631299

Leaman B. Podolsky - Wilmington DE
Charles L. Groves - Wexford PA

Westinghouse Electric Corporation - Pittsburgh PA

F01B 2500

364494

A system for detecting the failure of steam inlet valves to respond properly to their respective control signals, is disclosed. The detection of such a contingency provides an appropriate indication, and also initiates a transfer to single valve operation when operating in the sequential valve mode. The system provides for indicating and/or transferring to single valve operations only after the contingency has been detected for a predetermined interval to compensate for the velocity limiting characteristics of the valve actuators.