Table. 5.3.9 - 100. Event messages.
Event block name
Event names
REF1
I0d> (87N) Trip ON
REF1
I0d> (87N) Trip OFF
REF1
I0d> (87N) Block ON
REF1
I0d> (87N) Block 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 ACTIVATED, BLOCKED, etc. The table below
presents the structure of the function's register content.
Table. 5.3.9 - 101. Register content.
Date and time
Event
Trigger
currents
Maximum trigger
currents
Residual
currents
Used SG
dd.mm.yyyy
hh:mm:ss.mss
Event
name
Biascurrent
Diffcurrent
Characteristics
diff
Biascurrent max
Diffcurrent max
Characteristics diff max
I0Calc
I0 meas
Setting group 1...8
active
5.3.10 Overvoltage protection (U>; 59)
The overvoltage function is used for instant and time-delayed overvoltage protection. Each device with
a voltage protection module has four (4) available stages of the function (U>, U>>, U>>>, U>>>>). The
function constantly measures phase voltage magnitudes or line-to-line magnitudes. Overvoltage
protection is based on line-to-line RMS measurement or to line-to-neutral RMS measurement (as the
user selects). If the protection is based on line-to-line voltage, overvoltage protection is not affected by
earth faults in isolated or compensated networks. The blocking signal and the setting group selection
control the operating characteristics of the function during normal operation, i.e. the user or user-
defined logic can change function parameters while the function is running.
The overvoltage function uses a total of eight (8) separate setting groups which can be selected from
one common source.
The function can operate on instant or time-delayed mode. In time-delayed mode the operation can be
selected between definite time (DT) mode and inverse definite minimum time (IDMT).
The operational logic consists of the following:
• input magnitude selection
• input magnitude processing
• threshold comparator
• block signal check
• time delay characteristics
• output processing.
The inputs for the function are the following:
• operating mode selections
• setting parameters
• digital inputs and logic signals
• measured and pre-processed voltage magnitudes.
A
AQ
Q-M255
-M255
Instruction manual
Version: 2.06
130
© Arcteq Relays Ltd
IM00020
Summary of Contents for AQ-M255
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