AZT-9
12
ZPrAE Sp. z o.o.
Use the direction buttons
,
to switch between particular groups. To select a function
that is in a given group of settings place the cursor (a frame) using
,
buttons and
confirm with
button. When the parameters of a selected function of the AZT-9
protection device are displayed, select a given parameter by placing the cursor on it using
,
buttons and press
. The frame showing the selected parameter will start
blinking. It indicates that the value can be changed. By using direction buttons set a proper
value of the selected parameter. To confirm the changes press
button. To cancel the
change press
.
In this case the frame will stop blinking and the selected parameter will
be set to the value that was previously saved. To go to the other group of the settings go
back to the main menu using
button. To save new values of parameters press
button in the main menu. You will then be prompted to save the changes.
After pressing
button a screen for entering the password will be displayed.
Use
,
arrows to move between the password characters; to change the value of a
given character use
,
buttons. Confirm the password using
button. If you do not
want to save the changes press
button or leave the device and do not press any
buttons for 60 s.
4.1. Configuration of phase, earth-fault and negative sequence protection
Phase, earth-fault and negative sequence protections have three independently
configured stages I, II, III.
The following parameters can be set for each stage:
-
Mode:
- protection mode (switched off, undercurrent, overcurrent, overcurrent with
independent DMT characteristics, overcurrent with dependent IDMT characteristics),
-
Energising threshold
: - value of trigger current activating selected threshold,
-
Time tdel:
- time delay between energizing of protection and activation of a given
threshold,
-
Time tres:
- reset time, time to the reset of operation time delay after energising signal
disappears. In case of operation and disappearance of energising signal – release
time.
If the selected protection stage operates with DMT characteristics independent from
the value of current, the delay time “tdel” and reset time “tres” is given directly in seconds.
For a selected mode with dependent IDMT characteristics delay time is calculated
based on the following mathematical equation:
