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PTE-50-CET
Sheet 32
4.
FUNCTIONS: USE AND DESCRIPTIONS
Throughout this section a detailed description of the use and procedures for the PTE-50-CET will be
given. This unit has been designed to be used as a portable three-phase unit to test any kind of relays, as
a stand-alone unit or interconnected to other auxiliary units. All the functions that are incorporated in this
unit were designed to easily test the relays. This is achieved, as all functions are located on the front
panel in a MANUAL mode, which before required test units, which were programmable by an external
computer.
Furthermore, the PTE-50-CET, and thanks to the BUS-PTE, can be easily interconnected to other units in
the PTE range, making the specific functions for relay testing, much more simple and effective.
4.1.
TIME MEASUREMENT
The timer is normally activated by a power output, despite it is current or voltage. For this reason,
when it is stopped by a “STOP” signal, it holds the actual measurement in the display.
The resolution of this timer is 0.001 s, which is sufficient to test almost any protection relay.
4.1.1. SIGNAL
MONITOR
It is here where the timer receives the signals from the relay being tested and this is shown in the
optic LED indicator marked MONITOR.
The
Signal Monitor
is ACTIVATED in the following conditions:
1. When there is a VOLTAGE PRESENCE between the common tap and the voltage tap (red).
This voltage can be between 3 to 250 V in ac or dc. This input is protected with a fuse clearly
marked.
2. When there is a CLOSED FREE CONTACT between the common tap and the contact tap
(green). This input is protected with a fuse clearly marked on the front panel.
In both of these conditions, when the
Signal Monitor
is active a red LED will light up.
NOTE:
When connecting the monitor signal to the free contact tap (green) be sure that it is really
free from voltage as the protection fuse will break immediately.
4.1.2. TIMER MODE SELECTION
The timer mode is selected with the
Mode
key and the following modes can be selected
•
Mode 1:
Start:
By the injection of current or voltage.
Stop: When
the
Signal Monitor
is activated.
•
Mode 2:
Start:
By the injection of current or voltage.