GLOSSARY
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MTS-3000 SERIES OPERATION AND REFERENCE MANUAL
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Harmonic Current Mode This current mode
outputs a current which is the sum of a fundamental
and harmonic current, and which is used for
harmonic restraint testing. (4.5.2, 5.2.3)
Hook-up The wiring connections required between
the MTS-3000 and the relay under test.
Internal Start Timer Mode In this mode, the timer
starts synchronously with the transition from
prefault state to fault state. (4.4, 4.4.3)
Line Sync Mode In this frequency mode, the
voltage and current outputs are phase and frequency
locked to the input AC line (Mains). (3.3.3, 3.3.3.1)
Local Control Mode Mode used for all front
panel, manual operation. (7.2.1)
Mains refers to the line input that provides power to
the MTS-3000. (3.3.3, 3.3.3.1)
MTS – modular test system
Operation Mode The operation mode defines how
various inputs affect the operation of the MTS-3000
during fault state. The operation mode may be static
or dynamic. (4.3.2)
Output Contact Mode The auxiliary output
contacts can be programmed for various operation
modes, such as NO, NC, 52A, 52B, etc. (5.75)
Output Levels The present level of the voltage and
current outputs. The output level may be the
prefault or fault setting, or off. In prefault state, the
output level may be set to off using the PREFAULT
button. This overrides the prefault settings. In
postfault state, the output level is always off. (3.1.1)
Parallel Current Mode This current mode
matches the phase angle and amplitude of multiple
AC current channels when high current is needed.
The total current from all paralleled sources is
displayed and can be modified with a single
adjustment. (3.3.7, 5.2.4)
Postfault State The postfault state simulates the
inputs to the relay after the fault condition and relay
operation. (4.1.3)
Prefault State The prefault state simulates the
healthy inputs to the relay prior to the fault
occurrence. (4.1.1)
Programming Mode This is used to preset AC
output parameters for either prefault or fault state.
The AC outputs are disabled while the system is in
programming mode. (3.1.1)
QuickTest The QuickTest feature provides a built-
in suite of automated tests for most common
protective relays. (6.0)
Relay ID A unique five-digit identification
number used to identify a particular relay when
using QuickTest.
Remote Control Mode Mode used for operation
under computer or external device control. (5.2.1)
Stack - the optional modules that are combined to
make up a particular MTS.
Static Fault Mode This mode is used to perform
operate level / pickup tests. (4.3, 4.3.1)
Static Testing Testing of relays using very slowly
varying inputs to accurately locate pickup points.
(3.3.2, 4.3.1)
Test Mode The system is in “Test Mode”
whenever the AC outputs are enabled via the
ENABLE button. When the ENABLE LED is lit,
the system is in Test Mode. (3.1.1)
Trigger Action An action, such as a start or stop
trigger, which causes the MTS-3000 to change
between fault states (prefault, fault or postfault).
(4.3.2, 4.4)
Two-Wire Pulse Timing Method for timing an
event (such as a voltage pulse), using a single pair
of wires. (4.4.7)
Variable Frequency Mode In this frequency
mode, the voltage and current outputs are generated
from an internal crystal oscillator, and may be
varied between 8Hz and 1000 Hz. (3.3.3, 5.2.6)