AZT-9
ZPrAE Sp. z o.o.
3
2.2. LCD screen.
In the centre of the AZT-9
front panel there is a screen with overview of present
values of measured currents, energy storage level and basic settings.
Fig. 2.3. Main screen overview
[1,2,3] - L1, L2, L3 current measurement tilt indicator
[4,5,6] - Present values of measured L1, L2, L3 currents
[7]
- Present
I
e
ground fault current value
[8]
- Present current value of the I2 negative sequence component
[9]
- Percentage value of the negative sequence component to the positive sequence
component I2/I1 ratio
[10]
- Energy storage charge level
[11]
- Present date and recorder time
2.3. Control buttons.
Buttons for control of the AZT-9 protection from the front panel are located next to
the LCD display. Four buttons to the right are used to control an on-screen pointer;
confirmation, menu access (MENU) and cancellation buttons (ESC.) are located below.
A separate blue button (DEL.) can be used to confirm the AZT-9 protection device is
working and to delete alarms.
2.4. Power and fault LEDs.
On the right side of the housing there are two LEDs indicating the status:
-
FAULT
– yellow light in case of an internal fault of the protection device.
-
POWER
– green light if the device is powered from an auxiliary source, blue light if
it is powered only from instrument transformers.
2.5. Operation indicators with magnetic memory.
Below the two signalling LEDs there are four indicators with magnetic memory
allowing for reading recorded information even if there is completely no power supply to
the device. The software provided with the AZT-9 protection device (or the control buttons)
allow for selection of signals from the list available in the program. There is a description
field next to the indicators. A signal description field of a single indicator is 42 mm × 10 mm
(W×H). Signal descriptions can be printed on foil or paper and inserted under the
transparent part of the front panel.
