Eaton Cutler-Hammer FP-5000, Instructions Manual

Page: 161 / 187

IL17569
Page Appendix-2
Effective June, 2001
IP Address A 32-bit number containing both a subnet address and a host address
that identify a device in a network.
IR Residual ground current calculated for the three phases, Ia + Ib +Ic, is a calculated value
not measured directly. It will be different on a 4-wire system.
IOC Instantaneous Over Current protective function; The IOC functions have an optional time
delay for coordination with other relays.
IX Current measured by a fourth system current transformer. This could be a physical ground
measurement from a residual current connection of the phase Cts.
LAN Local Area Network.
Left Mouse Button The primary mouse button, unless you have configured your mouse differently. When
instructed to click on an item, point to it and press the left mouse button.
List Box A box on a pop-up screen that displays information, allowing you to scroll through
or select its contents.
Modbus protocol A popular industrial communication protocol.
MODEM Modulator/Demodulator – encodes and decodes data stream, typically
for transmission over telephone lines.
Mouse A hand-held pointer that attaches to your computer. The mouse displays on the computer
screen as an arrow. By moving the mouse and clicking the mouse buttons, you can perform
and select various operations.
PC Personal Computer based upon the Intel™ processor family.
Phase Reversal When any two phases become reversed.
Phase Unbalance Deviation of the percentage of nominal line voltage between any two phases.
Point To position the pointer so that it is resting on the desired item on the screen.
Pointer The hollow white arrow that you can move around the screen using the mouse.
Pop-Up Screens A screen that displays access to a PC program function, prompting you to enter
additional information.
Power Flow Power Flow is the direction of power flow for each harmonic, and is defined as the sign of
WATTS = [Id*Vd + Iq*Vq] for that harmonic. Thus, a positive power flow is power into the load,
and a negative power flow is power being generated by the load. Power should be greater
than 2% of the full load to be sure the result has significance. Zero power should default to
a positive power flow.
Reactive Power (VARs ) Reactive power or energy associated with the displacement power factor is power factor
correctable (Volt-Amperes Reactive). It is sometimes referred to as the “Q” or “Q-Hours.”
Calculation of the “Q” will use the technique of multiplying voltage samples by the associ-
ated current samples taken 90° earlier. Thus, a leading power factor will follow the conven-
tion of being positive.
Real Power (Watts) Real power is computed by summing the product of the individual current and voltage
readings over one cycle.
Right Mouse Button The secondary mouse button, unless you have configured your mouse differently. Use the
right mouse button only when specifically instructed to do so.
rms The rms value of a quantity X follows the standard definition of: With sufficient sampling,
harmonics will be included in the rms values.
RS-232 A standard that defines the electrical characteristics of a widely-used
serial communication link.
T/H Track and Hold.