Eaton Power Xpert Solar 1500 User Manua page 72

Glossary
Term
kVA . . . . . . . . . . . . . . . . . Kilovolt • Ampere.
kW . . . . . . . . . . . . . . . . . . Kilowatt (1,000 Watts).
LOTO . . . . . . . . . . . . . . . . Lockout-Tagout / Lockout/Tagout / Lockout and Tagout
MPPT . . . . . . . . . . . . . . . . Maximum Power Point Tracking
MSDS . . . . . . . . . . . . . . . Material Safety Data Sheet
NEC . . . . . . . . . . . . . . . . . National Electric Code
NEMA . . . . . . . . . . . . . . . National Electrical Manufactures Association
NFPA . . . . . . . . . . . . . . . . National Fire Protection Association
Neutral Conductor . . . . . . The conductor connected to the neutral point of a system that is intended to carry current
OCPD . . . . . . . . . . . . . . . . Overcurrent Protection Device.
OSHA . . . . . . . . . . . . . . . . Occupational Safety and Health Administration
PCC . . . . . . . . . . . . . . . . . Point of Common Coupling (or POCC)
PLC . . . . . . . . . . . . . . . . . Programmable Logic Controller
Power Factor . . . . . . . . . . Defined as the ratio of the real power flowing to the load or facility (kW) to the apparent
62 Power Xpert Solar 1500/1670 kW Inverter MN141001EN—October 2014 www.eaton.com
Abbreviation / Definition
Apparent power, the vector sum of the real (P) and reactive (jQ) AC power vectors. Also,
defined as the root-mean-square (RMS) of the voltage (Vrms) times the current (Irms) in
sinusoidal voltages and currents of the same frequency. As applies to solar inverters, the kVA
rating is based upon the maximum output current, including reactive power (vars).
A measure of energy or power.
References the OSHA standard for The Control of Hazardous Energy (Lockout/Tagout), Title 29
Code of Federal Regulations (CFR) Part 1910.147. In addition, 29 CFR 1910.333 sets forth
requirements to protect employees working on electric circuits and equipment.
The 1500 kW inverter operating (algorithm) state for the maximum energy harvesting of the
photovoltaic system. The MPPT point varies with solar irradiance and solar-cell temperature,
amongst other factors.
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Formally titled, NFPA 70: National Electrical Code.
Published by the National Fire Protection Association, Inc (NFPA).
The "NEC" is the world's most widely used and accepted code for electrical installations.
Publishes the National Electric Code
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under normal conditions.
Note: A neutral conductor is a current-carrying conductor, regardless of the fact it is grounded.
Typically a fuse or circuit breaker. (As applied to an inverter's (PV) input circuits as defined by
the NEC 2001 Figure 690.1(B), fuse or CB OCPDs form the final module-strings' combiner).
OSHA is part of the United States Department of labor.
The point at which the power production and distribution network and the customer interface
occurs in an interactive system. Typically, this is the load side of the power network meter.
For photovoltaic systems, this is the point where the inverter's output circuit connects to a
building's service equipment or distribution panel, or the utility distribution network in larger
utility-scale PV systems.
A programmable logic controller (PLC) or programmable controller is a digital computer used
for automation of electromechanical processes, such as control of power generation
equipment. 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. A PLC is an example of a hard real time system since output
results must be produced in response to input conditions within a limited time, otherwise
unintended operation will result. The control programs are stored in battery-backed-up or
non-volatile memory.
power (kVA) in the facility's circuits.
Typically expressed as a percentage, where 100% is perfect power (unity) where the kW
equals the kVA and reactive power is supplied by the utility.
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, and other Codes and Standards
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