Brochure DGMS final LowRes - 2 Pages

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Catalogue excerpts

Extended power plant protection The functionality of the DGMS extends that of the normal protection functions from the relays. Because the DGMS can be Installed as a stand-alone system, it Is well suited for both newbuilds and existing vessels as a functional upgrade to the current power generation protection and monitoring system. Generator monitoring functions DGMS monitoring functions are designed to detect abnormal behavior of the generator set, which indicates a fault. An alarm is Issued to the IAS whenever a fault DGMS provides the following monitoring functions: - Correlation algorithms are used to monitor each generator Individually and detect over-/under-fueling - Voting algorithms are used to group and compare generators running In parallel. If the load on one generator deviates excessively from the others, it Is identified as faulty. Voting algorithms are provided for both reactive (excitation) and active (fueling) power. - With fuel rack position monitoring, the position of the engines fuel rack Is compared to the active power - Excitation current monitoring compares the excitation current produced by the AVR to the reactive power output of the generator. A linear relationship is assumed between the excitation current and the generator reactive power. If the performance of the generator set deviates excessively from this relationship, a fault Is detected. The DGMS provides several additional monitoring functions as a back-up for the protection functions described above. Tripping functionality Each DGMS Is able to trip the generator which It monitors as well as the bustles connecting Its switchboard section to other sections. If the monitoring functions detect a fault, which then deteriorates until the remaining healthy generators are In danger of being tripped, the appropriate trip sequence will be Initiated. In the case of a fault on the same bus section, the DGMS will trip the affected generator. If the fault lies on another section, the DGMS may trip bustles to isolate the fault. Tripping functionality includes: - Stop engine and close fuel valve - Open circuit breaker when power falls to zero For more Information please contact Drilling rigs and FPSO s are typical applications that can benefit from DGMS. Marine Automation Diesel Generator Monitoring System (DGMS) A reliable safeguard against blackout The Diesel Generator Monitoring System (DGMS) is an important tool for assuring efficient operations for vessels and offshore facilities. By proactively monitoring the vessefs diesel-electric generators, the DGMS mitigates potential onboard power plant problems and failures before they occur. A problem source for blackouts Power generation Is the most important part of the design of diesel-electric power plants for marine and offshore applications. The basic protection of the power plant against abnormal behavior and blackouts has traditionally been to split the power plant into several independent units and install dedicated protection relays for each generator. These relays continuously monitor the voltage and current at each feeder In the switchboards. If exposed to electrical failures or abnormal behavior such as short circuits, over/ under voltage or overloads, the relays disconnect the exposed generator(s) from the switchboard. However, certain types of faults of the automatic voltage regulators or engine governors are not necessarily detectable by monitoring only the faulty generator. Such faults may In fact cause the other healthy units to behave abnormally In an attempt to maintain acceptable voltage and frequency. This can lead to a cascade fault In which all the healthy units are disconnected, leaving only the faulty unit running. Without the healthy units to maintain the frequency and voltage, the faulty unit will then also be tripped, resulting In a complete blackout of the affected switchboard. The Diesel Generator Monitoring System (DGMS) addresses this issue by monitoring all connected generators simultane- ously for fault types that typically cause disconnection of healthy generators. These faults Include over/under fueling of the diesel engines and over/under excitation of the By checking that each generator behaves according to the control mode selected by the PMS and governor, the DGMS can correctly Identify a faulty unit and automatically disconnect it from the switchboard before a cascade fault DGMS response to generator faults includes: - Detecting failure - Creating alarms - Starting standby diesel engines - Isolating faulty engines before a blackout condition occurs (only If system crosses pre-set trip limits) - Isolating faulty switchboard section (only If isolation of faulty engine falls)

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Maintaining the integrity and safety of the power plant through intelligent generator monitoring Advanced process control technology The DGMS is based on the ABB Compact Products 800 automation concept, which utilizes ABB AC 800M process The DGMS Is a modular system that is designed for use on power systems with up to 8 generators and 8 switch- board splits. The system uses one cabinet per generator, with each cabinet Including an AC 800M process controller with corresponding S800 I/O modules and power supply. Each cabinet interfaces with Its assigned generator, Automatic Voltage Regulator (AVR),...

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