”One of Europe’s most comprehensive TEST STATIONS is available for hire”.
Parsons Peebles Generation Limited factory facility offers a complete range of test facilities for High Voltage motors and generators.
All tests offered to International Specifications and Standards.
Extensive facilities both on-site and in our factory.
Factory Test Capacity:
Induction motors-Direct Load testing up to 8MW at 60Hz and 7.5MW at 50 Hz.
Generators-Up to 35MW, Zero PF, Rated Current, Rated Excitation.
Above 35 MW-Open and Short Circuit method. All voltages up to 15kV
Site Testing:
A comprehensive list of test equipment is available. Details on request.
Please contact us with your specific requirements.
Motor and Generator Test Capability
Parsons Peebles Generation Limited (PPGL) has an exceptional test capability at Rosyth. Here is a summary of the capability for testing synchronous and asynchronous machines.
Induction Motors and Generators
Peebles can test induction motors at 50 or 60 Hertz to BS EN/IEC60034 with ratings up to 15000 kW. Testing to IEEE (USA) requirements can also be undertaken.
The following tests can be carried out:-
No load losses and magnetisation characteristic.
Temperature rise using direct loading via the differential gearbox, the superposition method or by C. V. F. (continuously varied frequency, known as Primary Superposed Frequency in the USA).
Direct on line starting capability at both 50 and 60 Hertz within the capability of Peebles test 40MVA generator.
Locked rotor tests and starting torque measurement. This is limited to 2000 kW of losses (mostly rotor loss) in the motor under test, by the power that can be provided by the 40MVA generator set.
Vibration measurement, recording and analysis, using the Bently Nevada ADRE equipment, and balancing on rotor end planes. The output can be downloaded onto disc for further analysis.
Winding HV testing up to 33 kV with 100 kVA capacity.
Purging and pressurising certification testing of Ex p machines for hazardous areas.
Noise testing
In some cases motor performance values would need to be extrapolated, depending on the motor characteristics and the method of extrapolation would then be presented in the contract specific test procedure.
The following outlines the options for load testing induction motors and generators.
Differential Gearbox
The large induction motor load test installation consists of a two pole induction generator coupled to differential and reduction gearboxes.
This installation allows PPGL to test to the following levels:-
50hz 6600, 11000 & 13200 Volts 7500 kW
60hz 6600, 11000 & 13800 Volts 8000 kW
Maximum rating at 3300 Volts is 3000 kW.
The ratings can be obtained directly at two pole speed using the differential gearbox and at four, six and eight pole by the addition of the reduction gearbox.
Superposition
The temperature rise of an electric motor can be determined by the superposition (forward short circuit) method.
Motors up to D15000 kW can be tested using this method.
Continuously Varied Frequency
The determination of stator winding temperature rise using the Continuously Varied Frequency method can be carried out on motors up to 3000 kW
Back to Back
Provided the contract has more than one motor then the units can be tested using the back - back method.
The site plant generation capability and the incoming 6600V grid permits the following:-
50Hz 6600, 11000 3000 kW
50Hz 3300, 11000 1300 kW (motors with three phase ends)
60Hz 3300, 6600, 11000 1300 kW
Smaller motor ratings can be back – to - back load tested using "in-house" test motors as the load machines.
Multi-Pole Motors (8 pole and above)
Motors up to 1900 kW having pole numbers 8 and upwards can be tested by coupling up to portable DC motors.
Vertical Motors
Vertical motors can be tested horizontally when the bearing configuration is acceptable. In this instance the load test capability is the same as the back – to - back test limits.
Alternatively the C.V.F. method would be used to determine temperature rises.
Synchronous Motors and Generators
PPGL can test synchronous motors and generators at 50 or 60 Hertz with ratings up to 40 MVA but there is no firm cut-off point. Testing is limited by the generating capacity on the site.
By using open circuit and short circuit heat runs machines up to 100 MVA can be tested.
Open and short circuit loss characteristics would be established.
Heat runs can be carried out at rated excitation, zero power factor up to 35 MVA. For all ratings the heat runs can be performed utilising short circuit, open circuit and unexcited runs.
Sudden three phase short circuit tests, time constants and reactances
Negative and zero sequence reactances can be measured.
Overspeed tests can be carried out on all but 2 pole generators
Vibration measurement, recording and analysis, using the Bently Nevada ADRE equipment, and balancing on rotor end planes. The output can be downloaded onto disc for further analysis.
Winding and sample coil HV testing up to 33 kV with 100 kVA capacity.
All rigid shaft generator rotors would be balanced in their own bearings. In addition we can trim balance two pole flexible rotors utilising accessible balancing planes.
Summary of Test Facilities
Within the test area the following Motor-Generator sets are available for supply:-
40MVA, up to 2800kW 40 - 60 Hz up to 13.8kV.
4MVA, up to 1100kW 50 or 60 Hz up to 13.8kV.
5MVA, up to 1000kW 0 - 60 Hz up to 13.8kV.
900kVA, up to 200kW 0-72 Hz up to 8kV.
DC supplies are also available up to 750V and 2500A.
A cooling water supply is available up to 2000 litres/min. for water cooled machines.
There is a dedicated oil system, with flow rates up to 70 litres/min’, for machines requiring circulating oil for bearing lubrication.
Peebles can carry out full HV coil testing in accordance with EEMUA 132 requirements.
The balancing machine is used for balancing rotors up to 10000kgs. Motor and generator rotors can be trim balanced on test if required.
For handling the motors and generators there is a 63 ton capacity crane.
The facility is capable of carrying out performance tests on synchronous machines up to 50MW at either 50 or 60 Hertz and induction machines up to 15MW.
