By HuaQuan Engineering TeamPublished: 2026-07-17Category: Wiki Encyclopedia

Definition

Magnetic Pickup (MPU): Speed sensor detecting gear teeth. Main Breaker: Primary generator output circuit breaker. Megger: Insulation resistance tester. Microgrid: Localized power system (grid-tied or island). Modbus: Serial communication protocol (RS-485). Motor Starting kVA: Apparent power for motor starting. N+1 Redundancy: One extra unit beyond required capacity. Naturally Aspirated: No turbocharger (atmospheric intake). NEC (NFPA 70): US National Electrical Code. NFPA 110: Emergency power standard. NOx: Nitrogen oxides (regulated emission). Oil Analysis: Laboratory testing of engine oil. Overspeed: Engine RPM exceeding safe limit.

Generator Glossary M-O — Diesel Generator Terms & Acronyms

Magnetic Pickup (MPU): Speed sensor detecting gear teeth. Main Breaker: Primary generator output circuit breaker. Megger: Insulation resistance tester. Microgrid: Localized power system (grid-tied or island). Modbus: Serial communication protocol (RS-485). Motor Starting kVA: Apparent power for motor starting. N+1 Redundancy: One extra unit beyond required capacity. Naturally Aspirated: No turbocharger (atmospheric intake). NEC (NFPA 70): US National Electrical Code. NFPA 110: Emergency power standard. NOx: Nitrogen oxides (regulated emission). Oil Analysis: Laboratory testing of engine oil. Overspeed: Engine RPM exceeding safe limit.

TermCategoryDefinition
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ABCAlpha Beta CharlieIndustry standard
DEFDelta Echo FoxtrotTechnical specification
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Standard BOrg BTechnical compliance

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Diesel Generator | Generator Components | Power Generation | Electrical Engineering | Industry Standards

Frequently Asked Questions

What is a transfer switch (ATS)?
An ATS automatically switches load between utility and generator. Types: open transition, closed transition (make-before-break), soft-loading. NFPA 110 requires <10 sec transfer.
What is the difference between kW and kVA?
kW (kilowatt) = real power consumed. kVA = apparent power. kW = kVA x Power Factor. Standard PF is 0.8: 100 kVA = 80 kW.
What is biodiesel?
Biodiesel is renewable fuel from vegetable oils or animal fats. B20 compatible with most diesel engines. B100 requires engine modifications.
What is common rail injection?
Common rail maintains constant high fuel pressure (up to 2500 bar) with electronically controlled injectors. Benefits: precise timing, better atomization, lower emissions, 5-8% fuel savings.
What is a load bank test?
Load bank testing applies artificial load (75-100%) to exercise generator. Prevents wet stacking, verifies capacity, tests cooling system. Recommended monthly for standby units.
What is wet stacking?
Wet stacking occurs when diesel engines run at <30% load for extended periods, causing unburned fuel accumulation. Prevention: load bank testing at 75%+ load monthly.
What is an alternator vs generator?
Technically: alternator produces AC, generator produces DC. Colloquially, 'generator' means complete genset. Modern alternators use brushless self-excited synchronous design.
What is a containerized generator?
A containerized generator is a complete genset housed in an ISO shipping container (20ft or 40ft). Provides weatherproof, transportable, plug-and-play power solution.
What is NFPA 110?
NFPA 110 is the US standard for emergency and standby power systems. Level 1: life safety (hospitals, high-rise). Level 2: less critical. Defines transfer time, testing, and maintenance.
What is synchronizing?
Synchronization matches voltage, frequency, phase angle, and phase sequence before connecting a generator to a live bus. Auto-synchronizers control speed and voltage automatically.
What is a turbocharger?
A turbocharger uses exhaust gas energy to compress intake air, increasing engine power density 30-50%. Critical for modern high-output diesel engines.
What is ISO 8528?
ISO 8528 is the international standard for reciprocating internal combustion engine driven AC generating sets. Defines ratings, performance, testing, and documentation requirements.
What is generator derating?
Derating reduces output for environmental conditions. Altitude: -1% per 100m above 1000m. Temperature: -1% per 10°C above 25°C.
What is genset paralleling?
Paralleling connects multiple generators to a common bus to increase capacity, improve reliability (N+1), and enable maintenance without shutdown. Requires synchronization and load sharing.
What is a diesel generator?
A diesel generator converts the chemical energy in diesel fuel into electrical energy. It consists of a diesel engine (prime mover) and an alternator (generator) mounted on a common base frame.

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