AZT-9
ZPrAE Sp. z o.o.
15
Detection of instrument transformer oversaturation has hard-set parameters:
-
Minimum level of oversaturarion detection - I > 2 I
N
,
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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,
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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),
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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).
