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Generator Glossary

Three-phase Generator

Generator with 400 Volt output (European Standards), consisting of 3 phases and a neutral, with 400V between phases and 230V between phase and neutral.

Single-phase Generator

Generator with one phase and neutral output. The output voltage is 220V for Europe and Turkey.

Contactor

Switch used for the transfer of electrical energy inside the automatic transfer panel.

Kilowatt

One thousand Watts is one kilowatt, abbreviated kW. That's a measure of power.

Voltage (V)

Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating light. In brief, voltage = pressure, and it is measured in volts (V).

kVA

Kilo Volt-Ampere is the rated power of generators.


Ampere (A)

The measure of current intensity. The number of electrons that pass through a cross-section of a wire per unit time.

Generator's Rated Power

Standby, Prime or Continuous power of a generator in kVA.

Alternative Current (AC)

An electric current periodically reversing direction and changing its magnitude continuously with time depending on a constant magnetic field.

Direct Current (DC)

An electric current flowing in one direction onlyand constant in value.

Alternator

A device converting mechanical energy into electrical energy. It is rotated by a driving machine.

Ampere Hour (Our)

An Ampere Hour is the amount of energy charge in a battery that allows one ampere/1000 mAh of current to flow in one hour.

Battery Charger
A device for recharging the battery.
Frequency (Hz)
The number of cyles per second in an AC sine wave.
Governor

Component controlling the engine speed mechanically or electronically.

Horse Power (HP)

Mechanical or electrical power measurement unit. 1 Hp = 0.746 kW.

Manual Generator
Manually operated generator. 

Automatic Generator

A back-up electrical system that operates automatically. Within seconds of a utility outage, an automatic transfer switch senses the power loss, commands the generator to start, and then transfers the electrical load to the generator. After utility power returns, the automatic transfer switch transfers the electrical load back to the utility and signals the standby generator to shut off.

Automatic Voltage Regulator (AVR)

A static voltage regulator automatically performs the necessary adjustments to keep the generator voltage at the nominal level.

Overload

An overload in a generator generally happens when extreme numbers of appliances are plugged into the generator. This causes the generator to exceed its designed power output.

Continuous power

Continuous power generation under a fixed load. The load can be 100% on average. It must not be overloaded.

Prime power

Continuous power generation under variable load. Its average load must be 70%. It can be overloaded by 10% for 1 hour every 12 hours.

Standby power

Power generation for a limited period under variable load. It can work 200 hours a year under 70% load on average. It is used as a standby power supply in case of municipal power failure. It must not be overloaded.

Generator rpm

The number of rotations of the generator in one minute. Portable generators are generally 3000 rpm and diesel generators 1500 or 1800 rpm depending on the output frequency.

Portable Generator

Gasoline or Diesel Generators that can be easily moved from place-to-place.

Installed load

Installed load of the facility where the generator will be used. The minimum generator capacity must be capable of supplying this load.


Automatic Transfer Switch (ATS)

ATS is a device that transfers a power supply from its primary source automatically to a backup generator when it senses a failure or outage occurring in the primary source until utility power is restored.

Control panel

A panel where the indicators and control equipment of the generator is located.

Sound Proof Canopy

A cabinet protecting generator set against external conditions and reducing the noise level in accordance with applied standards.

Altitude

Defines the height above sea level where the generator will be utilized. As the altitude increases, the amount of oxygen decreases, resulting in power loss specified by the engine manufacturers.

Synchronous Generators

Generator groups that automatically synchronize the mains and loads with functions such as load backup, load sharing, and fault backup.

Bore

The inner diameter of the cylinder.

Stroke

Top and bottom level of the piston movement inside the cylinder.

Displacement

Refers to the total volume of engine cylinders in liters.

Compression ratio

Compression of the air entering the cylinder at a certain level in proportion to the cylinder volume.