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

Definition

Voltage Dip: Momentary voltage reduction. Voltage Regulator (AVR): Maintains output voltage. Wet Stacking: Unburned fuel accumulation at light load. Winding: Coils of insulated wire (stator/rotor). Volt-Ampere Reactive (kVAR): Unit of reactive power. Voltage: Electrical potential difference. VSD (Variable Speed Drive): Motor speed controller. Watt (W): Unit of real power. Wye (Star) Connection: Three-phase with neutral. Delta Connection: Three-phase without neutral. Zig-Zag Connection: Special transformer winding. Zero Sequence: Current component for ground faults.

Generator Glossary V-Z — Diesel Generator Terms & Acronyms

Voltage Dip: Momentary voltage reduction. Voltage Regulator (AVR): Maintains output voltage. Wet Stacking: Unburned fuel accumulation at light load. Winding: Coils of insulated wire (stator/rotor). Volt-Ampere Reactive (kVAR): Unit of reactive power. Voltage: Electrical potential difference. VSD (Variable Speed Drive): Motor speed controller. Watt (W): Unit of real power. Wye (Star) Connection: Three-phase with neutral. Delta Connection: Three-phase without neutral. Zig-Zag Connection: Special transformer winding. Zero Sequence: Current component for ground faults.

TermCategoryDefinition
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AbbreviationFull FormContext
ABCAlpha Beta CharlieIndustry standard
DEFDelta Echo FoxtrotTechnical specification
Related StandardOrganizationScope
Standard AOrg AIndustry governance
Standard BOrg BTechnical compliance

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

Frequently Asked Questions

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 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 generator derating?
Derating reduces output for environmental conditions. Altitude: -1% per 100m above 1000m. Temperature: -1% per 10°C above 25°C.
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 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.
What is Modbus?
Modbus is an open serial protocol (RS-485) for generator controller integration. RTU mode: registers map to generator parameters. Supported by most controllers.
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 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 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 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 IP rating?
IP (Ingress Protection) indicates enclosure protection. IP44: spray water. IP54: dust protected. IP65: dust tight + water jets. Generator enclosures typically IP44-IP65.
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 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 a brushless exciter?
Brushless excitation eliminates brushes/slip rings using rotating rectifiers. Benefits: no brush maintenance, no carbon dust, explosion-proof — standard in modern generators.
What is a standby generator rating?
Standby rating: maximum power for emergency use, 200-250 hours/year max, no overload. Typical for backup applications. Also called Emergency Standby Power (ESP).

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