Line Conditioning by a Motor-Generator Set Provides a Source of Clean Power:
Two Examples of Maritime Applications
An important application for motor generators is line isolation, where a clean source of electrical power, free of switching transients or other fluctuations, is required. In the two applications described here, a Horlick FC Model 60-60 Hz motor-generator set is used onboard a ship and an oil rig to prevent line noise from reaching sensitive electronic equipment.
In motor-generator set applications used for line conditioning, the input and output voltages can be configured as required for the application. The key to the design is the mechanical isolation that exists between the motor and generator. The mechanical isolation effectively filters out any switching transients or other fluctuations on the input and it allows the generator to produce a clean, noise free, sinusoidal output voltage.
The Horlick Company recently shipped a Model 60FC-603, 75 KVA, 60-60 Hz, motor-generator set to SEACOR.
This motor-generator set was placed on their “Anchor Handling Towing Supply” (AHTS) vessel, the Seacor Vanguard. AHTS vessels are naval ships specifically built to tug or tow oil rigs to sea and oceanic areas. The “anchor supply” mentioned as a part of the vessel’s name is then allowed to be sunk into the seawater in order to anchor the oil rig. Additionally, another major feature of these vessels is that they also act as rescue vessels for other ships in times of distress or emergency.
SEACOR Marine’s AHTS vessels are built to deploy and recover mooring systems for deepwater drilling rigs. These highly specialized vessels have high cargo capacities and large capacity traction winches for the deepwater mooring of their customers’ drilling rigs. In order to achieve their critical tasks, these vessels employ state-of-the-art electronics to monitor and control their equipment and to provide dynamic positioning capabilities. The sensitive electronics in this particular case were experiencing failures due to the electrical noise that was originating from other 60 Hz loads within the vessels’ electrical distribution system.
To combat the problem, the Horlick motor-generator set was installed between the equipment that was generating the electrical noise and the sensitive electronics so as to provide electrical isolation. Horlick line conditioners have the ability to run from the “noisy” source and provide clean isolated power to the sensitive equipment. The system supplied to the SEACOR Vanguard provided a 60 Hz power source free of switching transients, voltage fluctuations and power line noise. 60FC Model motor-generator sets are rated for continuous duty and they isolate and protect computers, instrumentation and other sensitive electronic equipment from electrical faults that may cause erratic performance or failure. They are ideal in applications that require a pure sine wave and absolute load isolation.
In another somewhat similar maritime application, Horlick is shipping a Model 60FC-2003, 250 KVA, 60-60 Hz motor-generator set to Atwood Oceanics.
Atwood Oceanics is an offshore drilling contractor. Established in 1968, Atwood is a leader in delivering safe, reliable and efficient offshore drilling services around the world. Atwood has a multinational workforce of 1,500 people and they own eleven drilling rigs that operate in most of the world’s leading offshore hydrocarbon basins. Atwood Oceanics was named to Forbes’ 2011 “Best Small Company” list for the 5th consecutive year.
The Horlick Company is currently constructing a Model 60FC-2003, 250 KVA motor-generator set that is to be placed on one of Atwood’s semi-submersible oil drilling platforms, the Atwood Falcon. This platform is currently located off the coast of Australia and it is a Maltese Cross class drilling platform that works in ocean depths up to 25,000 feet.
In a manner similar to the one described above for the AHTS vessel, the Horlick motor-generator set will be installed between the power source for the rig and its sensitive electronics. These electronics are currently experiencing interference from the oil rig power supply. The motor-generator will condition the 60 Hz power, making it clean for the sensitive electronics. In this particular application, the motor-generator set will be mounted in Horlick’s custom outdoor enclosure as it will be mounted on the rig platform.
Horlick line conditioners are designed to minimize equipment damage, shutdown and data loss in areas where incoming power line fluctuations are a problem. They are ideally suited for maritime applications such as those described above. Horlick supplies two types of motor generators sets for line conditioning; the FC and the RC lines. The FC Model is the most economical and it was chosen for these applications because a precise 60 Hz output was NOT required. The output frequency on these units is 60 Hz at no-load and they linearly slip to approximately 59.2 Hz at full-load. In applications where a precise 60 Hz output is required, the Horlick Company offers its RC Model motor-generator set which utilizes a synchronous motor to drive the generator. The synchronous motor runs at a constant speed from no-load to full-load and this allows the output frequency to be precisely 60 Hz for all load conditions. Both the FC and RC Models can also be used in 50 Hz applications to create the same level of electrical line isolation herein described.
For more information on Horlick Motor Generators Sets please contact us at 781-963-0090