SR4 Generator with VR3 or VR4 Voltage Regulator Caterpillar


Glossary

Usage:

3306B 1DG
Actuate - Actuation relates to putting something in motion.

Anode - An anode is the positive end of a diode or an anode is the positive end of a rectifier.

Blocking Rectifier - A blocking rectifier permits direct current flow in only one direction.

Bolted - A bolted device uses a bolt to hold two or more parts together.

Bridge - A bridge is a circuit that is used to measure small quantities of current, voltage, or resistance.

Bridge Rectifier - A bridge rectifier is a circuit that is used to change alternating current (AC) to direct current (DC).

Buildup - A buildup is a gradual increase in voltage.

Cathode - A cathode is the negative end of a diode or a cathode is the negative end of a rectifier.

Capacitance - Capacitance is the ability to store an electrical charge.

Capacitor - A capacitor is a device that will store an electrical charge.

Circuit Breaker - A circuit breaker is an automatic switch that is used to open a circuit.

Circulating Current - Circulating current is the flow of current between two or more generators that are operating in parallel. Circulating current is also the flow of current between two or more generators that are operating parallel with a utility line.

Conduct - Conducting relates to allowing the flow of current.

Continuity - Continuity provides a continuous path for current flow.

Control - A control is a device that controls another device. A control is also a circuit that controls a device.

Direct Current (DC) Controlled Reactor - The direct current controlled reactor gives resistance to the current flow to the rectifier according to the voltage droop setting.

Damping - Damping refers to decreasing the amplitude of a signal.

De-energized - A de-energized input refers to stopping the current that is going to a component.

Distribution Winding - Distribution windings go from one end of the core to the other end of the core. These windings are arranged in groups that are located in several slots.

Droop (Voltage) - Droop refers to a decrease in output voltage as engine speed (frequency) droops due to an increase in load.

Excitation - Excitation is controlled direct current (DC) that is used to make a magnetic field.

Energized - An energized input refers to activating a device.

Electrostatic Charge - Electrostatic charge is electricity that is caused by induced voltage and stored charge.

Exciter - An exciter supplies direct current (DC) to the main field windings of the generator.

Field - A field is magnetic lines of force that surrounds a conductor. This force is caused by current flow in the conductor.

Field Windings - Field windings are many turns of wire that are wrapped around an iron core. When direct current (DC) flows through the field windings, a magnetic field is produced. This magnetic field is comparable to the magnetic field of a bar magnet.

Flashing - Flashing is a process of putting direct current from an external source into the field windings. This process causes the generator to produce an output voltage.

Flux - Flux is magnetic lines of force.

Full-Wave Rectifier - A full-wave rectifier changes the positive phase and the negative phase of alternating current to direct current.

Gain - Gain relates to the relationship between input magnitude and output magnitude.

Gate - A gate is an electronic terminal on a controlled rectifier (thyristor).

Generate - This refers to the process of making electricity.

Grounded - A device is grounded by making a connection to ground. A device could also be grounded by making a connection to a component that is connected to ground.

Humidity - Humidity is the water content that is present in the air.

Impedance - Impedance is the resistance to alternating current flow.

Impulse Modulation - Impulse modulation changes the following characteristics of a wave: amplitude, frequency and phase. This is accomplished by impressing one wave on another wave that has constant properties.

Induce - This refers to the transfer of power from one device to another device. The transfer is done via a magnetic field or via an electric field.

Induced - This refers to power that is transferred by electromagnetic fields.

Interference - Interference is an unwanted mixture of electrical signals. Interference is usually associated with electrical noise.

Instrumentation - Instrumentation is a group of instruments that are used for measuring a system function.

Insulated - An insulated device is a device that is covered with a nonconductive material.

Lead - A lead is a wire.

Line Voltage - Line voltage is the output voltage of the generator that is measured between the generator leads (phases).

Lock In - A lock in occurs when a contact closes in order to keep a device in an energized state.

Lock Out - Lockout occurs when a contact opens in order to keep a device in a de-energized state.

Magnetic - A magnetic device is a device that has the characteristics of a magnet.

Magnification - Magnification refers to the enlargement of an item.

Module - A module is an assembly of electronic components and electronic circuits.

Moisture - Moisture is the presence of water.

Oscillation - Oscillation is the flow of electricity that periodically changes direction and/or magnitude.

Permanent Magnet (PM) - A permanent magnet supplies the initial magnetism that is required to start a PMPE generator.

Permanent magnet pilot exciter (PMPE) - PMPE generators receive power for the voltage regulator from a pilot exciter. A PMPE generator consists of a permanent magnet (rotor) and a pilot exciter (stator).

Phase Winding - A phase winding is a group of generator stator coils. Electric power for one phase of the load is induced in the phase winding.

Polarity - Polarity is the positive characteristics or the negative characteristics of two poles.

Pulsating - Pulsating relates to the characteristics of current that are similar to mechanical vibration.

Radio Suppression - Radio suppression reduces the amplitude of radio frequency interference.

Reciprocating - Reciprocating motion is motion that first moves in a straight line in one direction. The direction of this motion then varies by 180 degrees.

Rectifier - A rectifier is a diode circuit that converts alternating current (AC) to direct current (DC).

Rotating Rectifier - A rotating rectifier is mounted to a plate on a generator shaft. This plate then rotates with the generator shaft.

Regenerative Power - Regenerative power is power that works against primary power.

Reset - A reset returns a switch to a ready condition. In addition, a reset returns a circuit to a ready condition.

Residual Magnetism - Residual magnetism is a small amount of magnetism that is remaining in a device after excitation is removed.

RFA - An RFA is a rotating field assembly.

Rotor - A rotor is the rotating windings of a generator.

Saturable Reactor - A saturable reactor has characteristics that are similar to a valve. As the load changes, a valve opens in order to give more current to the output or a valve closes in order to give less current to the output.

Saturated - A device has been saturated when the device has been magnetized in excess. When saturation occurs, a large increase in current results in a small increase in magnetic force.

SCR - An SCR is a silicon controlled rectifier. An SCR is a semiconductor.

SE - An SE generator is a self-excited generator. An SE generator uses a small part of the generator output to provide excitation current back to the generator. An SE generator uses residual magnetic field for start-up.

Semiconductor - A semiconductor is a component such as one of the following components:a transistor, a diode and a thyristor. Semiconductors have electrical characteristics that are between a conductor and insulation.

Series Boost - A series boost is an attachment that allows excess generator output current to continue for a short time during a line failure. This allows the circuit breaker to trip in sequence.

Short - A short is an undesired electrical connection that exists between two or more components.

Shutdown - A shutdown occurs when the engine is stopped. This shutdown can occur manually or this shutdown can occur automatically.

Simultaneous - A simultaneous occurrence refers to two actions that happen at the same time.

Solid-State - A solid-state component is an electrical component that has no moving parts.

Stator - A stator is the windings of a generator that do not rotate.

Surge - A surge is a sudden increase in voltage or current.

Tap - A tap is a connection between the endpoints of a circuit. From this tap, power is taken from the circuit.

Transfer - A transfer refers to moving something from one point to another point. A transfer also refers to converting something from one state to another state.

Transient Peak Voltage - A transient peak voltage is a high voltage condition of limited duration.

Turn-on - When a device is turned on, the device is activated (energized) or the device is started.

Varistor - A varistor is a device that decreases in resistance as voltage increases.

Voltage Droop Resistor - A voltage droop resistor is a variable resistor. This resistor is used to adjust the circulating current between two or more generators that are operating in parallel. This can also occur when the generator is paralleled with a utility.

Voltage Gain Resistor - A voltage gain resistor is a variable resistor. This resistor is used to control the change of voltage from no load to full load.

Voltage Level Rheostat - A voltage level rheostat gives a range of control that is used to adjust the voltage output level of the generator.

Voltage Spike - A voltage spike is a brief high voltage.

Windings - Windings are layers of wire on a core.

Wiring - Wiring relates to the wires of a circuit.

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