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EURO-DIESEL UK - Frequently Asked Questions

Click on the drop down links below to read a frequently asked question and review simple explanations of the terms and jargons used within the UPS market players using the glossary below:

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What is an Accumulator...

(a.k.a. Kinetic Energy Accumulator, Energy Storage Device) A device able to store kinetic energy. This energy is used to supply the critical load through a synchronous machine during the initial seconds of Mains power failure.

Alternative Current Input

DCM board that processes the analog signals (4 currents, 4 voltages) of a 3-phase electrical network for their digitisation by an A/D converter.

Automatic Transfer Switch

A switch designed to sense the loss of one power source and automatically transfer the load to another source of power.

CAN Board

DCM board that supports the CAN bus drivers (see also Controller Area Network Bus).

Controller Area Network Bus

Field bus used in parallel NO-BREAK KS® system for sharing information between units.

Diesel Rotary Uninterruptible Power Supply

(a.k.a. Dynamic UPS (DUPS) or Continuous Power Supply (CPS)) UPS where one or more electrical rotating machines provide the output voltage.Power system for maintaining continuity of loadpower in the event of failure of the mains power

Emergency Standby Power

According to ISO 8528-1: the maximum power available during a variable electrical power sequence, under the stated operating conditions, for which a generating set is capable of delivering in the event of a utility power outage or under test conditions for up to 200 hr of operation per year with the maintenance intervals and procedures being carried out as prescribed by the manufacturers.

Human Machine Interface

The user interface in a control system.

Limited Time Power

According to ISO 8528-1: the maximum power available, under the agreed operating conditions, for which the generating set is capable of delivering for up to 500 hr of operation per year with the maintenance intervals and procedures being carried out as prescribed by the manufacturers.

Low Voltage

Refers to voltage below 1000V (typically 400V, 480V and 600V).

Medium Voltage

Refers to voltage between 1000V and 35000V according to IEEE 1585-2002 standard; between 600V and 69000V according to NECA/NEMA 600-2003.

Medium Voltage Switchgear

Panels containing the power switching devices needed for an MV NO-BREAK KS® system. The term switchgear refers to the combination of power switching devices used to operate and protect the electrical equipment.

Power Factor

Active power divided by apparent power.

Programmable Logic Controller

A programmable logic controller (PLC) or programmable controller is a digital computer used for automation of processes. Unlike general-purpose computers, the PLC is designed for multiple inputs and output arrangements, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. Programs to control the process are typically stored in battery-backed or non-volatile memory.

Reactive Power

Portion of the total power consumed by a device or system, that is equal to the product of the voltage and the portion of the current not in phase with the voltage. It is expressed in Volt-Ampere Reactive (VAr) and correspond to the power consumed by the reactive (capacitive or inductive) portion of a load.

Total Harmonic Distortion

Ratio of the RMS value of the harmonic components as a percentage to the RMS value of the fundamental component of the periodic function.

Transient Reactance

The transient reactance, X’, is the generator internal impedance element that becomes effective a few cycles after a transient load event (time constant T'). It allows to calculate the evolution of the fault current from the generator as well as the voltage drop (after the very first moments).

Uninterruptible Power Supply

Power system for maintaining continuity of load power in the event of failure of the Mains power.

Zero Sequence Reactance

The Zero Sequence reactance, Xo, is the generator internal impedance element to the Zero Sequence currents. It is used to determine line-to-neutral short circuit currents.

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