PTE-50-CET
Sheet 6
1.
INTRODUCTION
The PTE-50-CET is designed as a
Portable Three Phase Unit
that allows the user to test, as stand
alone unit or in combination with others, all type of protective relays.
Extremely compact and rugged, this unit incorporates the latest in the modern microprocessor technology
to achieve unbeatable output characteristics in terms of power, accuracy, low distortion, and dynamic
capability. This technology allows the unit to perform, without any external accessories, various specific
functions very often used in the relay testing.
All the output signals are digitally generated, amplified and controlled by the internal IGMs (Intelligent
Generation Modules) in terms of amplitude, phase and frequency. A high accuracy and stability are
obtained in the output waveforms, which are absolutely independent of the main supply.
Contained in an aluminum IP-65 case, with a membrane keyboard that allows full manual control, and a
RS-232 com port for computer control, the PTE-50-CET offers the best features actually available for on
site manual or automatic relay testing.
1.1.
MAIN FUNCTIONAL FEATURES
The following are the more outstanding functions/features that the PTE-50-CET has:
a) TIMER MEASUREMENT
Used when measuring the timing response of relays during test. The
digital timer
which is
incorporated in the PTE-50-CET has a
resolution of 1 ms
and contains all the necessary controls
to select the starting and stopping of the timer whether it is external or internal, or when using the
monitor signal or via PTE-BUS.
b) AVAILABLE REFERENCES
The power output has
three different references
available:
•
The main supply phase (
Line
).
•
The PTE BUS (BUS).
•
The
External Phase Reference
(current or voltage).
c) POWER OUTPUTS
The
current or voltage outputs
are available,
up to 50 A
in four ranges and
up to 150 V
in two
ranges respectively.
Any power outputs combination is possible
: two channels can work in voltage mode and the
other one in current mode, or even all of them can work in voltage mode. In current mode, the unit
allows channels parallel connection so it can supply up to 3 x 50 A = 150 A.
All the outputs have a
dynamic capability
. The output
regulation
can work
independently or
linked in a three phase system
, when PTE units are working together interconnected through
the PTE BUS, any combination of dynamic steps to 2
nd
values, can be selected in amplitudes and
phase angles for any type of fault simulation.
