ZPRAE AZT-9 User manual

AUTONOMOUS TRANSFORMER
PROTECTION
Busbar protections and b
protections
reaker failure
type TSL-9r, TSL-11
Reserve Central Signalling System
type MSA-9, MSA-12, MSA-24
Protection relays
type AZT-9, APP-9
Disturbance recorder RZS-9
Energy measurement system
and event recorder ZRZ-28
Load Resistors
for measuring transformers
Modular power supplies, measuring suitcases,
measuring and registering system RFQ-8
DC and AC auxiliary
power supply switchgears
Cubicle-contained sets of control
and supervision protections
Periodical and post-failure tests,
as well as repairs and overhauls
of busbar protections TSL
Servicing, strting-up
and post assembly tests
PROFIL-L cubicles
Auxiliary and signalization
relays
RSH-3, RSH-3S - tripping
RS-6, RPD-2, RPP-4, RPP-6 - interposing
RMS-2 - signalling
RCW-3, RCDW-1 - circuit continuity monitoring
RB-1, RBS-1, RBS-2 - bistable
RT-22 - time
RUT-2, RUT-3 - time-voltage
RJT-1, RJT-3 - time-current
RKU-1, RKS-1 - final controlling
LZ-1, LZ-2 - operation counters
RPZ-1 - supply source switching
GPS-1 - time synchronisation
MDD-6, MDS-12 - Diode modules
Relay racks
PH-XX, PS-XX - Modules of switches,
and control lampspushbuttons
RKO-3 - power supply circuit
continuity monitoring
OFFER

Protections
and logic
Communication
event and
disturbance
recording
Current
inputs
Power
supply
Power supply
from voltage
transformers
(OPTION)
Additional
cards
(OPTION)
Charge
control
Energy
storage
Output
relays
contacts
Tripping
pulses
Binary inputs Binary inputs
Auxiliary
power supply
Additional auxiliary
power supply
Ethernet
IEC 61-850
LCD display
Energy storage charging
Contact outputs
Current
Communication
External communication
(STANDARD)
RS232
ZP6
Interface
Communication
Magnetic
memory
indicators
Control
buttons
Structural diagram of the AZT-9.
Control system or a local computer workstations
Ethernet
IEC 870-5-103 / ZP6
Interface RS232
IEC 870-5-103 / ZP6
Fibre optic interface
IEC 870-5-103 / ZP6
Fibre optic interface
IEC 870-5-103 / ZP6
Fibre optic interface
IEC 870-5-103 / ZP6
Interface RS485
IEC 870-5-103 / ZP6
Interface RS485
IEC 870-5-103 / ZP6
Synchronisation
GPS
Additional external communication
depending on local requirements.
(ADDITIONAL OPTIONS)
Binary outputs
for signalling

AZT-9
ZPrAE Sp. z o.o. 1
1. APPLICATIONS.
Autonomous AZT-9 protection device is dedicated to safeguard a transformer in
emergencies, especially when primary protections of the transformer fail to operate due to
loss of auxiliary voltage. It is possible since independent power supply circuits are used:
opower supply provided by current transformers for both the basic logic functions
(protection, disturbance recorder, binary inputs, relay outputs, basic
communication) and for energy storages used to generate an impulse for a
switch off coil,
oexternal AC/DC power supply allowing for extension of the device's functionality
with additional binary input cards, relay outputs and extended external
communication (Ethernet, optical cable, …).
ooptional auxiliary power supply provided by circuits of voltage transformers.
Application of this power supply solution allows it to work even in case of a loss of
primary power supply. If AZT-9 detects a fault requiring the transformer to be switched off
in order to protect it against destruction, the device sends a switch off impulse from an
independent, internal, capacitor energy storage.
1.1. Basic features of the AZT-9 protection device:
Overcurrent and earth-fault protections with one, two or three stages, with independent
or dependent characteristics.
Protection against asymmetric power supply and loss of phase.
Undercurrent protection.
Input of an external trigger of storages acting as breaker failure protection.
Protection against oversaturation of instrument transformers (SAT).
Twin energy storages allowing for operation with two circuit breakers (two coils) or in
case of parallel collection allowing for increasing the impulse energy or sending two
impulses within a set time interval (so-called re-trip).
Internal event and disturbance recorder.
Circuit breaker diagnostics: control of operation time, number of trip outs and a sum of
currents tripped out.
Device locking input.
Communication with a monitoring system via IEC 61850 and 870-5-103 protocols, over
optical cables or other method specified by the customer.
Set of 8 configurable multicolour LEDs displaying information selected by the user from
an internal list.
Set of 4 configurable operation indicators with magnetic memory.
Front panel with buttons and an LCD display for overview of operating parameters and
setting basic configurations from the device's front panel.
Optional power supply module for supplying additional power to the device from voltage
transformers.
Optional module of a test socket for device testing.
Set of relay outputs for signalling operation and disturbance in operation of the device.
Set of universal binary inputs
The AZT-9 protection device is supplied with necessary software ( ) and full
documentation in Polish required to design, perform independent configuration and
facilitate device operation.

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2. CONSTRUCTION.
The device was designed according to state of the art technology. The internal
current and voltage elements, as well as the logic circuit of the protection device are fully
digital.
The AZT-9 has a casing suitable for installation in 19” swing frames of cubicles.
External circuits can be connected via connectors on the rear panel of the unit. An LCD
display, signal LEDs and operation indicators with magnetic memory (allowing for reading
of basic information even in case of complete lack of power supply to the device) are
located on the front panel. Furthermore, on one side of the casing there is room for
installation of an optional test switch with inspection sockets. Software supplied with the
device makes configuration of the AZT-9 and its following operation easier. It provides the
ability to monitor current status of the protection device on a computer screen, read data
from the event and disturbance recorder and change the configuration of the AZT-9 if
required. A 19”/3U/240 (483×133.5×245 mm) EURO housing made of chromate plated
aluminium provides higher resistance to EMC interference. Additional space,
approximately 55 mm deep, should be available behind the device for installation cables to
be connected with multipin connectors.
Fig. 2.1. External dimensions of the AZT-9 protection device.
2.1. Front panel.
Fig. 2.2. Front panel.
483 300
466 245
450
8,5
AZT-9
Sygnał konfigurowalny 1 06 Transf. TR1 110 kV
Sygnał konfigurowalny 2
Sygnał konfigurowalny A2
Sygnał konfigurowalny A3
Sygnał konfigurowalny A4
Sygnał konfigurowalny A5
Sygnał konfigurowalny 3
Sygnał konfigurowalny 4
Sygnał konfigurowalny 5
Sygnał konfigurowalny 6
Sygnał konfigurowalny 7
Sygnał konfigurowalny 8
PO LE
1
2
3
4
5
6
7
8
USZKODZENIE
ZASILANIE
KAS . MENU ESC.

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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 Ieground 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.

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2.6. Signalling LEDs and signal description fields.
In this part of the front panel there are 8 signalling LEDs with description fields for
identification with a suitable signal name. Multicolour super-bright RGB LEDs function as
optical indicators. It is possible to use the software supplied with the AZT-9 protection
device (or the control buttons) to select the signals from the list available in the program.
The LED colour can also be selected from the available range: yellow, red, green, blue,
purple. Next to the LEDs there are description fields. A description field for one LED 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.
2.7. Rear panel and modules.
Fig. 2.4. Rear panel.
Card connectors for external connections are located on the rear panel. LgY cables
are recommended for external connections. The protection device has current and binary
inputs, contact outputs, power supply and external communication connectors. The output
sending the impulse to the switch off coil is separate and specially marked. The impulse is
generated with the energy from the energy storage.
WARNING! The energy storage is normally fully charged; therefore the module can
be energized with 300 V DC even when the device is not connected to any power supply!
3. OPERATING PRINCIPLE.
The device is to be used for protecting transformers, outgoing feeders and busbars
as a backup for primary protection devices.
The core function of AZT-9 is to provide delayed overcurrent phase (51P) and
earth-fault protection (51N). In emergencies, if the primary protection devices do not shut
off the overcurrent, the AZT-9 will generate a shutdown impulse using its own energy
storage after a set delay. The AZT-9 does not require an additional auxiliary power supply
to initiate the shut off impulse because it can be powered by measuring current
transformers. The BAT-1 energy storage can store energy for several weeks allowing the
device to be ready quickly in case of emergencies. If the energy storage is charged before
a disturbance occurs the time required to start up the device and prepare it for operation is

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less than 250 ms. "Cold start” (discharged energy storage) requires additional time (ca.
40 s) to charge energy storage before initiation of the shut off impulse.
3.1. Current inputs.
The current inputs module is divided into two sections: the measurement section
with measuring current transformers and precise analogue-to-digital converters, and the
power supply section with current transformers supplying power to the device.
Fig. 3.1. Current circuits.
Fig. 3.2. Current circuits in a protection device fitted with a test module.
3.2. Shut off circuits.
To send shut off impulse the AZT-9 uses energy stored in twin energy storage.
Combined with independent power supply from current circuits (powering the protection
device, as well as charging the energy storage) this allows for operation of the protection
even in case of complete lack of auxiliary power supply. The recommended setup consists
of two switch off circuits working with a separate third switch off coil. However, shut off
circuits sending impulses to CW1 or CW2 coils can be installed. That case requires all
activation impulses to be separated with depletion diodes. Since the protection device has
two energy storages and two shut off impulse outputs the energy can be increased, double
tripping pulse (re-trip) is possible or impulses can be sent to two independent circuit
breakers.

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Fig. 3.3. Tripping circuits with the energy storages connected in parallel.
Fig. 3.4. Tripping circuits of two independent circuit breakers.
The BAT-1 shut off module has two outputs of relays switching when shut off
impulses from energy storage No. 1 and no. 2 are sent. Use of latching relays makes them
independent of any power supply after operation of the protection device. The signal can
be reset after auxiliary voltage or current transformer power reappears.
If the optional test module is used, the shut off circuits are switched from external
circuits to the external test module checking correct operation of energy storage during the
test.

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Fig. 3.5. Shut off circuits in the protection device with the test module.
External circuits as in figures 3.3. or 3.4.
3.3. Test of the protection device.
The AZT-9 protection device can be additionally equipped with the MTT-10 test
module. It can be used for periodical testing of the AZT-9 protection device and condition
of energy storage elements without modification of the device's cabling. Initiating the
testing procedure results in sending shut off impulses to the internal load elements of the
MTT-10 module equivalent to load provided by 2 × 300 W coils. Time of the shut off
signals is used to determine condition of particular sections of the storage. If the storages
are operational "Storage 1 OK" and "Storage 2 OK" LEDs will light up for ca. 7 s after
completion of the procedure. If the storages are damaged or their capacity falls below 70%
of the nominal capacity the LEDs confirming good condition of the storages will not light up
after completion of the test procedure.
Fig. 3.6. Front and rear panels of the MTT-10 module
3.4. Auxiliary power supply, contact outputs and binary inputs.
The AZT-9 device was designed assuming prioritization of power consumption
limitation to the minimum so it can work while it is powered only from the circuits of current
transformers. Therefore the number of inputs and outputs integrated on a single card with
a power supply unit is limited to the necessary minimum. Connector Z1 is used to connect
auxiliary power and includes:

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contact outputs:
- AZT working / AZT defective,
- AZT energized / AZT unenergized,
and binary inputs:
- shut off lock (if voltage is connected the AZT will not send shut off impulses),
- external energize signal PBFP (e.g. by a breaker failure protection or the
transformer's temperature breaker)
The last function acts as a local breaker failure protection of the specific feeder.
Sending shut off impulses from primary protection and elapse of delay time tBFP if the IBFP
criterion is met will cause the AZT-9 protection device to operate and send a shut off
impulse from energy storage. This can be compared to the so called re-trip of breaker
failure protection circuits.
Fig. 3.7. Auxiliary power supply, contact outputs and binary inputs.
To expand capabilities of the AZT-9 protection device beyond the basic functions
additional AD1 input card and YZ1 output card have to be added. However, they need
auxiliary power supply to work. Both the inputs and the outputs can be configured with the
software supplied with the AZT-9.
An optional MZD-1 card provides the possibility of connecting additional power
supply to the device; it allows the device to be powered from circuits of voltage relays.
Fig. 3.8. Additional auxiliary power supply.

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If the optional test module is used auxiliary power supply can be disconnected from
the device during the test to check autonomous power supply provided to the device from
current circuits.
Fig. 3.9. Auxiliary power supply in a protection device with the test module.
3.5. External communication.
Configuration can be performed and monitored via a RS232 (Z52) connector
included as standard. A proprietary protocol is used for communication from the level of
software provided with the AZT-9. External communication capabilities can be expanded
through installation of the MGB-9 hub module available in several versions. Depending on
requirements it comes with RS232, RS485, optical or Ethernet ports (see the table below).
As standard each communication channel simultaneously supports the following protocols:
proprietary ZPrAE (ZP6) and IEC-60870-103. The F1 version of the MGB-9 module allows
for communication over the IEC-61850 protocol. The MGB module requires auxiliary
voltage to work.

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Fig. 3.10. Communication.
3.6. Event recorder
Cache memory of the recorder allows for archiving up to 1000 events at 5 ms
resolution. Events are generated by the AZT logic module and stored in non-volatile
memory. If the AZT device is equipped with an MGB concentrator module, generated
events are rewritten into concentrator's main memory. The MGB concentrator allows for
saving 10000 events. In case of too many recorded events the oldest data will be
overwritten.
Data from the recorder can be sent to a primary control and monitoring system.

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3.7. Disturbance recorder
The AZT-9 protection device is equipped with a disturbance recorder recording
analogue data, protection status and binary states from all input and output modules of the
device at the frequency of 1 kHz. It enables in-depth analysis of the cause and working
conditions in case of operation. When the recording is triggered an impulse is generated
by one of 8 configurable channels of the recorder. Each channel can send the signal from
the logic of the AZT-9 device directly or as a negated signal. Total time of single recording
and post-trigger time of recording can be configured in a range from 0.6 to 60 s. The
recorder has a non-volatile memory that allows for saving 1- 210 records depending on the
time of a single recording. Trigger time and proper pre- and post-trigger operation time of
the device is saved when the recording is triggered. If the recorder runs out of space it
starts overwriting the oldest records. Records are saved in a universal COMTRADE
format. The device is supplied with software for viewing and analysing the records.
4. CONFIGURATION OF THE DEVICE FROM FRONT PANEL
All settings of the AZT-9 protection device can be remotely configured with proper
ZPrAE Edit software or using function buttons on a front panel. To view or change the
current settings go to main menu by pressing button. The following groups of settings
are available in the main menu:

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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:

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t = TMS * { k/[(I/IS)α-1] + c }
where:
t – time between energising and trigger of selected protection stage,
I – present value of measured current,
IS– set energising current of a given stage,
α, k, c – constants defining a given characteristic,
TMS = tdel [s] – multiplier of a given characteristic.
Table below shows the values of constant α, k and c for available IDMT
characteristics. Values of constants, except for the first characteristic, are defined in
accordance with the requirements of IEC, IEEE and C0 standards.
IDMT characteristics
k
α
c
Extremely Inverse ZPrAE
80
3
0
Standard Inverse IEC
0.14
0,02
0
Very Inverse IEC
13.5
1
0
Extremely Inverse IEC
80
2
0
Long Time Inverse IEC
120
1
0
Moderately Inverse IEEE
0.0515
0.02
0.114
Very Inverse IEEE
19.61
2
0.491
Extremely Inverse IEEE
28.2
2
0.1217
Inverse C08
5.95
2
0.18
Short Timer Inverse C02
0.02394
0.02
0.01694
Reset time for characteristics that comply with IEC standard is defined the same as
for DMT independent mode. For characteristics that comply with IEEE and CO standards
reset time is calculated based on the following equation:
t = RTMS * { tr/[(1-(I/IS)α]}
where:
t – time between the disappearance of energising signal and resetting of the calculated
delay time,
I – present value of measured current,
IS– set energising current of a given stage
α, tr– constants defining a given characteristics,
RTMS = tres [s] – multiplier of a given characteristics.
Table below shows the values of constant α and trfor available IDMT characteristics
to be applied in the equation for reset time.
IDMT characteristics
tr
α
Moderately Inverse IEEE
4.85
2
Very Inverse IEEE
21.6
2
Extremely Inverse IEEE
29.1
2
Inverse C08
5.95
2
Short Timer Inverse C02
2.261
2

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4.2. Control of current circuit continuity (CTS)
Control of current circuit continuity is performed by measuring negative sequence to
positive sequence ratio. This solution makes the measurement result insusceptible to the
values of current in measuring circuits. When values of current in three phases are similar
the ratio of negative sequence I2 to positive sequence is close to 0. In case of conductor
damage (current loss in one of the phases) this ratio increases rapidly. It makes it possible
to find the conductor damage and generate an alarm on a properly configured relay or
trigger the protection.
The following parameters can be set to execute CTS:
- Threshold I2/I1 – energising threshold for negative sequence component
expressed as a percentage of positive sequence component.
- Time tdel – time delay between energising and activation of protection.
4.3. Breaker failure protection.
The AZT-9 protection device is equipped with an input that enables triggering of
energy storages by an external signal. The input is active irrespective of the supply mode
(by instrument transformers, auxiliary power supply). Thanks to the additional current
criterion and configuration of delay time the input can perform a function of breaker failure
protection.
Breaker failure protection can be set to the following values:
- Energising threshold – current value from current criterion necessary to activate breaker
failure protection,
- Time tdel – time delay between energising the input (when the current criterion is met)
and activation of protection,
- Time tres – reset time, time to the reset of operation time delay after energising signal
fades out. In case of operation and disappearance of energising signal – release time.
4.4. Detection of oversaturation of an instrument transformer (SAT)
Detection of oversaturation of an instrument transformer operates based on the
change of curve shape at the instrument transformer output in case of oversaturation. After
3 ms from the detection of maximum amplitude of a signal a window of oversaturation
detection is activated. Detection of oversaturation of the instrument transformer starts if the
oversaturation detection window is below the half of the maximum value of amplitude and
when the change of a signal in the oversaturation detection window is lower than ¼ of the
maximum value of amplitude.
Fig. 4.1. Example of instrument transformer oversaturation curve.

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Detection of instrument transformer oversaturation has hard-set parameters:
- Minimum level of oversaturarion detection - I > 2 IN,
- Delay time – 150 ms,
- Length of an output impulse– t > 20 ms.
4.5. Configuration of energy storage cards (BAT) and a power supply unit card
(MZA)
Each of the protections and its individual thresholds can be used to trigger main
energy storage and/or as an information signal for configured relays of an optional MWP
card.
Group of settings for BAT, MZA cards allows for selecting particular protections triggering
the energy storages or activating the relay of an energised AZT.
Trigger of section 1 and trigger of section 2 may be activated by the following signals:
- Operation of phase protection stage I,
- Operation of phase protection stage II,
- Operation of phase protection stage III,
- Operation of earth-fault protection stage I,
- Operation of earth-fault protection stage II,
- Operation of earth-fault protection stage III,
- Operation of negative sequence protection stage I,
- Operation of negative sequence protection stage II,
- Operation of negative sequence protection stage III,
- Logic gate output 1 active,
- Logic gate output 2 active,
- Operation of protection due to exceeded temperature (option),
- Operation of protection due to lack of continuity of current circuits (CTS),
- Operation of protection by breaker failure protection input (when the current criterion
is met),
- Operation of detection of oversaturation of the instrument transformer (SAT).
The PK-1 relay in the MZA module (AZT-energised) can be activated by one of the
following signals:
- Energising of phase protection stage I,
- Energising of phase protection stage II,
- Energising of phase protection stage III,
- Energising of earth-fault protection stage I,
- Energising of earth-fault protection stage II,
- Energising of earth-fault protection stage III,
- Energising of negative sequence protection stage I,
- Energising of negative sequence protection stage II,
- Energising of negative sequence protection stage III,
- Logic gate output 1 active,
- Logic gate output 2 active,
- Energising of protection due to exceeded temperature (option),
- Energising of protection due to lack of continuity of current circuits (CTS),
- Energising of protection by breaker failure protection input,
- Energising of detection of oversaturation of the instrument transformer (SAT).

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For section 2 of the energy storage additional delay time can be defined, allowing for
generating two switch-off impulses in defined time intervals.
Detection of instrument transformer oversaturation has a fixed time delay of 150 ms
between energising and operation that allows for filtering accidental disturbances that may
occur during switching the transformer on.
4.6. Configuration of an MWD input card
The following parameters can be set for the binary input card, MWD:
- Time t_on: delay time from the moment a signal is sent to the input until activation
of its logic,
- Time t_off: hold time from the disappearance of energising signal until deactivation
of logic,
- Input type: input mode AC or DC (for AC mode additional filtering time needs to be
taken into account – 20 ms).
The binary input card (MWD) is active only when auxiliary power supply is connected.
Logic signals from the MWD card may be used to introduce various types of additional
signalling functions or to trigger the energy storages by external signal. Each of the inputs
can be used to introduce additional control functions (continuity of circuits, read of circuit
breaker status, etc.) by sending a logic signal from a binary input to the relevant
configurable LED, magnetic indicator or configurable relay.
4.7. Configuration of a relay card (MWP)
Group “MWP relays” settings allows for configuring the operation mode of each
available relay of the MWP card. The following parameters can be set for individual relays:
- Active: allows for switching the selected relay on or off,
- Reset: defines a way of releasing the relay after the energising signal disappears
(after selecting ”manual” the relay is sustained until the operator resets it, in case of
“automatic” the relay is released when the energising signal disappears),
- Negated signal: :allows for negating the status of the signal energising the relay,
- Signal No.: allows for selecting a signal from the list of available logic signals that is
used to energise the configurable relay.
List of available logic signals is described in section 7.
The relay output card (MWP) is active only when auxiliary power supply is connected to
the device.
4.8. LEDs.
Group “LEDs” settings allows for setting 8 configurable LEDs fitted on the front panel of
the device. The following parameters can be set for each LED:
- Active: allows for switching the selected LED on or off,
- Colour: allows for selecting the LED colour,
- Type: allows for setting light modes: continuous, pulsating,
- Reset: defines a way of turning off the LED after the energising signal disappears
(after selecting “manual” LED will be turned on until the operator resets it, in case of
“automatic” LED is reset when the energising signal disappears),
- Negated signal: allows for negating the status of the signal energising the LED,
- Signal No.: allows for selecting a signal from the list of available logic signals that is
used to light the LED.

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ZPrAE Sp. z o.o. 17
List of available logic signals is described in section 7.
4.9. Configuration of magnetic indicators (WSM)
Group “WSM indicators” settings allows for setting of 4 magnetic indicators fitted on
the front panel of the device. The following parameters can be set for each indicator:
- Active: allows for switching off the selected indicator on or,
- Reset: defines a way of “switching off” the indicator after the energising signal
disappears (after selecting “manual” the indicator will be switched on until the
operator resets it, in case of “automatic” the indicator is reset when the energising
signal disappears),
- Negated signal: allows for negating the status of the signal energising the
indicator,
- Signal No.: allows for selecting a signal from the list of available logic signals that is
used to set the indicator.
List of available logic signals is described in section 7.
4.10. Configuration of logic gates
The AZT-9 protection device has two 8-input logic gates enabling the extension of
protection functionality. Each of the gates can work as a sum or conjunction and gate input
can be used as a trigger of energy storage, energiser of relays, LEDs, magnetic indicators
or as a signal to the input of the second gate. The following parameters are used to
configure the gates:
- Type: defines the logic function carried out by the gate (OR, AND),
- Number of inputs: enables determining the number of active gate inputs (max. 8),
- Negated input: allows for negating individual gate inputs,
- Signal No.: allows for selecting a signal from the list of available logic signals that is
sent to the individual gate inputs.
List of available logic signals is described in section 7.
4.11. Configuration of a disturbance recorder
Group of “Recorder” settings is used to configure the operation of a fast changing
curves’ recorder. The recorder allows for recording samples of measured currents L1, L2,
L3, N, and 64 states of internal logic at sampling frequency of 1 kHz. It enables a detailed
analysis of the disturbance and identification of the device status when the disturbance
occurred, before the disturbance and after ATZ-9 operation. The following parameters are
used to configure the recorder:
- Total time of recording,
- Post-trigger recording time.
8 configurable channels can be used to trigger the recorder. For each channel the
following parameters can be set:
- Active: activates or deactivates the channel,
- Negated signal: allows for negating the status of the signal triggering a given
channel,
- Signal No.: allows for selecting a signal from the list of available logic signals used
to trigger a given channel.
List of available logic signals is described in section 7.

AZT-9
18 ZPrAE Sp. z o.o.
Number of recorded disturbances depends on the recording time set. For 0.6 s
setting a maximum number of recorded curves is 210. One record is possible in case of 60
s.
WARNING! Change in the recording time deletes automatically the previous
records.
4.12. Signalling of circuit breaker inspection
The AZT-9 protection device makes it possible to maintain the state of full readiness
of the circuit breaker thanks to the built-in control functions that improve its maintenance.
Maintenance functions of the circuit breaker include: counting of the number of trip outs,
measurement of circuit breaker time, cumulative sum of the values of tripped out currents
for individual phases, cumulative sum of the square of the values of tripped out currents for
individual phases.
The following parameters can be set in the group of settings related to the maintenance of
the circuit breaker:
- Maximum number of trip outs,
- Maximum time of circuit breaker opening,
- Maximum sum of currents in a given phase,
- Maximum sum of the square of the currents in a given phase.
Internal logic signal is assigned to each setting. It is activated when the controlled
parameter exceeds the set value.
Generated logic signal can be sent to a configurable relay, LED, magnetic indicator
or logic gate input to warn about a malfunction of the circuit breaker or required
maintenance.
4.13. Configuration of the AZT device system.
Group of “AZT configuration” settings allows for setting of the following parameters:
- Change password – allows for entering a password that limits the access to the
device configuration function,
- Set time – allows for setting a local time of the AZT-9. If an MGB module is
connected relay time is synchronised automatically with the time set in the MGB
module.
- Optional modules – enables support for optionally connected modules.