AZT-9
ZPrAE Sp. z o.o.
7
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:
