The blocking signal can also be tested in the commissioning phase by a software switch signal when
the relay's testing mode "Enable stage forcing" is activated (
General
→
Device).
The variables the user can set are binary signals from the system. The blocking signal needs to reach
the device minimum of 5 ms before the set operating delay has passed in order for the blocking to
activate in time.
Operating time characteristics for activation and reset
This function supports definite time delay (DT). The following table presents the setting parameters for
the function's time characteristics.
Table. 5.6.5 - 310. Settings for operating time characteristics.
Name
Range
Step
Default
Description
Phase THDV alarm
delay
0.000…1800.000s 0.005s 10.000s Defines the delay for the alarm timer from the phase
currents' measured THD.
Events and registers
The voltage total harmonic distortion monitor function (abbreviated "THDV" in event block names)
generates events and registers from the status changes in the alarm function when it is activated. The
recorded signals are START and ALARM signals for the monitoring elements as well as common
BLOCKED signals. The user can select which event messages are stored in the main event buffer: ON,
OFF, or both.
The events triggered by the function are recorded with a time stamp and with process data values.
Table. 5.6.5 - 311. Event messages.
Event block name
Event names
THD1
THDV Start ON
THD1
THDV Start OFF
THD1
THD Alarm ON
THD1
THD Alarm OFF
THD1
Blocked ON
THD1
Blocked OFF
The function registers its operation into the last twelve (12) time-stamped registers. The register of the
function records the ON event process data for START, ALARM and BLOCKED. The table below
presents the structure of the function's register content.
Table. 5.6.5 - 312. Register content.
Date and time
Event
L1h, L2h, L3h Fault THD
Used SG
dd.mm.yyyy hh:mm:ss.mss
Event name
Start/Alarm THD of each phase.
Setting group 1...8 active.
5.6.6 Disturbance recorder (DR)
The disturbance recorder is a high-capacity (64 MB permanent flash memory) and fully digital recorder
integrated to the protection relay. The maximum sample rate of the recorder's analog channels is 64
samples per cycle. The recorder also supports 95 digital channels simultaneously with the twenty (20)
measured analog channels. Maximum capacity of recordings is 100.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
394
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
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