POWER SUPPLIES & GENERATOR
A BIT OF R&R A resistive-reactive load test of an
installation’s power system can accurately simulate the system’s response to a changing load pattern and power factor (pf) demands, such as would be encountered during real world running conditions or in the event of standby genset having to operate.
Resistive-reactive load banks are used to test the engine/turbine generator set at its rated pf. In most cases this is 0.8 pf. The reactive component of the load will have a current that “lags” the voltage. The resulting power is described in two terms, the kW, or real power, and the kVA or apparent power. The combination of resistive and reactive current in the load will allow for the full kVA rating of the generator windings to be tested. Even though the genset is producing more kVA, it is actually not producing more kW. The “real” power (kW) required from the engine/turbine is essentially the same.
Resistive-reactive testing can also reveal additional stresses (and help predict pending failures) of a system’s switchgear, alternators, and other systems that resistive-only testing cannot.
Commissioning aside, which is invariably performed onshore, loadbanks have other uses on large vessels. Permanently installed loadbanks allow for comprehensive testing to be integrated into the maintenance procedures of emergency systems in particular.
WHAT DOES THE
FUTURE HOLD? All major ship classification companies will have a closer eye on competent testing than ever before, with the recent growth in the industry. Through all levels of the shipbuilding journey from the ship owner, the ship builder to the ship insurer, all parties should ensure power on the ship has been tested adequately to guarantee efficient, reliable operation and security of investment.
www.crestchic.co.uk www.tomorrowsfm.com TOMORROW’S FM | 55
“CRUISE SHIPS REQUIRE MASSIVE
ELECTRICAL INSTALLATIONS IN ORDER TO POWER THE SHOPPING MALLS,
ENTERTAINMENT CENTRES, BARS AND RESTAURANTS ON-BOARD.”
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