# US 2015/0177104 A1 · System and method for testing a rotary machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0177104 A1 - Document ID: US20150177104A1 - Status: Published application - Kind: A1 - Application number: 14/307,936 - Filed: 2014-06-18 - Published: 2015-06-25 - Earliest claimed: 2013-12-23 - Assignees: General Electric Company - Applicants: General Electric Company - Inventors: Maxime Buquet - Web page: https://patentgrep.com/patent/US20150177104A1 ## CPC - G01M 15/14: Testing gas-turbine engines or jet-propulsion engines - F02C 7/00: Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants (controlling F02C9/00) - G01R 21/00: Arrangements for measuring electric power or power factor (G01R7/12 takes precedence) - F05D 2220/76: an electrical generator - F05D 2260/80: Diagnostics - F05D 2270/061: in particular the electrical frequency of driven generator - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A system for testing a rotary machine includes a variable load coupled to a shaft driven by the rotary machine, and a controller configured to regulate the rotary machine and the variable load in a closed loop. A variation in a load value of the variable load causes a variation in a power produced by the rotary machine. The controller is further configured to determine a response time required for the power produced by the rotary machine and a power consumed by the variable load to be balanced. ## Claims ### Claim 1 A system for testing a rotary machine, said system comprising: a variable load coupled to a shaft driven by the rotary machine; and a controller configured to regulate the rotary machine and said variable load in a closed loop such that a variation in a load value of said variable load causes a variation in a power produced by the rotary machine, said controller is further configured to determine a response time required for the power produced by the rotary machine and a power consumed by said variable load to be balanced. ### Claim 2 (depends on 1) The system of claim 1, wherein said controller is further configured to control the variation of the load value of said variable load. ### Claim 3 (depends on 1) The system of claim 1, further comprising a sensor operably coupled to the rotary machine, said sensor is configured to measure a rotation speed of the shaft, said controller is further configured to determine whether the power produced by the rotary machine and the power consumed by said variable load are balanced based on the measured rotation speed. ### Claim 4 (depends on 1) The system of claim 1, wherein said variable load comprises a compressor that includes at least one adjustment valve configured to regulate an air flow through an inlet of said variable load compressor. ### Claim 5 (depends on 4) The system of claim 4, wherein said controller is further configured to adjust the at least one adjustment valve to control the variation of the load value of said variable load. ### Claim 6 (depends on 4) The system of claim 4, wherein said controller comprises a compressor load map that stores settings of the at least one adjustment valve and corresponding load values of said variable load. ### Claim 7 (depends on 6) The system of claim 6, wherein said compressor load map further stores corresponding values of the shaft rotation speed. ### Claim 8 (depends on 1) The system of claim 1, wherein said variable load comprises an alternator coupled to a resistive load through a circuit breaker. ### Claim 9 (depends on 8) The system of claim 8, wherein said controller is further configured to determine whether the power produced by the rotary machine and the power consumed by said variable load are balanced based on a measured current provided by said alternator. ### Claim 10 (depends on 1) The system of claim 1, wherein said variable load comprises an alternator coupled to a motor through a circuit breaker, said motor is configured to drive a mechanical load. ### Claim 11 (depends on 1) The system of claim 1, wherein the rotary machine comprises a gas turbine, said controller is further configured to control a regulation valve of a fuel supply line of a combustion system of the gas turbine. ### Claim 12 (depends on 1) The system of claim 1, wherein the rotary machine comprises a gas turbine, said controller is further configured to control a regulation valve of a water supply line of a combustion system of the gas turbine. ### Claim 13 A method for testing a rotary machine, said method comprising: coupling a variable load to a shaft driven by the rotary machine; regulating the rotary machine and the variable load in a closed loop such that a variation in a load value of the variable load causes a variation in a power produced by the rotary machine; and determining a response time required for the power produced by the rotary machine and a power consumed by the variable load to be balanced. ### Claim 14 (depends on 13) The method of claim 13, further comprising controlling the variation of the load value of the variable load. ### Claim 15 (depends on 13) The method of claim 13, further comprising: measuring a rotation speed of the shaft using a sensor; and determining whether the power produced by the rotary machine and the power consumed by the variable load are balanced based on the measured rotation speed. ### Claim 16 (depends on 13) The method of claim 13, wherein the variable load comprises a compressor, said method further comprises adjusting at least one adjustment valve of an inlet of the variable load compressor to control the variation of the load value of the variable load. ### Claim 17 (depends on 16) The method of claim 16, further comprising storing a compressor load map that comprises settings of the at least one adjustment valve and corresponding load values of the variable load. ### Claim 18 (depends on 13) The method of claim 13, further comprising storing a set of load variation values associated with the measured response time of the rotary machine. ### Claim 19 (depends on 13) The method of claim 13, wherein said coupling the variable load to the shaft comprises coupling an alternator to a resistive load through a circuit breaker. ### Claim 20 (depends on 13) The method of claim 13, wherein said coupling the variable load to the shaft comprises coupling an alternator to a motor through a circuit breaker, wherein the motor is configured to drive a mechanical load.