Sices D-PRO, Technical Manual

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16 D-PRO Protection relay Technical Manual
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Bit 1. If this
bit is “OFF”, the controller sets to OFF the internal status related to this
ANALOGUE measure if the measure is “out of threshold”. If this bit is “ON”, the
controller sets to ON the internal status related to this ANALOGUE measure if the
measure is “out of threshold”.
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Bit 4. If this bit is “ON”, the controller issues a warning if the measure is “out of
threshold”.
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Bit 7. If this bit is “ON”, the controller issues a deactivation command if the measure
is “out of threshold”.
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Bit 13. If this bit is “ON”, to activate any warning/lock configured with the preceding
bits, the controller checks the status of any digital input configured with the function
“2705 - Disable the protections on the ANALOGUE measures”. The warnings/locks
will be activated if no digital input is configured as such, or if they are all OFF.
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Bit 15. If this bit is “ON”, the fault is subject to engine protections override (see par.7.5)
You can set any combination of these bit.
Using the two thresholds and the AND/OR logics together, you can activate a digital output
regarding the value of an ANALOGUE measure, with hysteresis. Suppose you want to activate
a digital output if the generator frequency exceeds 50.5 Hz. First of all you have to maintain a
minimum hysteresis on the threshold, otherwise, when the generator frequency is close to the
threshold, the output will continue to switch on and off, due to minimum variations of the
frequency itself. So suppose you want to activate the output if the frequency exceeds 50.5 Hz
and deactivate the output if the frequency is lower than 50.3 Hz. To do that, we can use, for
example, the virtual ANALOGUE input #1 which has been configured to contain the generator
frequency.
Let us set the parameters as follows:
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P.4051 (function #1): 4001 (AIF.4001).
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P.4052
(message #1): “”.
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P.4053 (threshold #1): 50.5 Hz
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P.4054 (delay #1): 0.5 sec
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P.4055 (configuration #1): 0002 (bit 0 OFF, bit 1 ON)
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P.4056 (threshold #2): 50.3 Hz
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P.4057 (delay #2): 0.5 sec
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P.4058 (configuration #2): 0001 (bit 0 ON, bit 1 OFF)
The first threshold is used to activate the internal status related to the virtual analogue input.
Looking at the configuration parameter you can see that:
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Bit 0 OFF (checks that the measure is higher than the threshold).
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Bit 1 ON (activates the internal status in “out of threshold” condition).
The second threshold is used to deactivate the internal status related to the virtual analogue
input. Looking at the configuration parameter you can see that:
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Bit 0 ON (check that the measure is lower than the threshold).
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Bit 1 OFF (deactivates
the internal status in “out of threshold” condition).
So with the previous programming, the controller activates the internal status related to the
virtual analogue input when the measure is greater than 50.5 Hz for 0,5 seconds; it deactivates
the internal status when the measure is less than 50.3 Hz for 0,5 seconds.