Table. 5.3.2.2 - 58. Register content.
Date and
time
Event code Trigger
current
Fault
current
Prefault
current
Meas/AL set
Meas TR/
set
Trip time
remaining Used SG
dd.mm.yyyy
hh:mm:ss.mss
10112-10123
Descr.
Start
average
current
Trip
-20ms
Start
-200ms
The ratio
between the
measurement &
the alarm
setting
The ratio of
the
measurement
& the trip
setting
0
ms...1800s
Setting
group 1...8
active
5.3.3 Non-directional overcurrent protection (I>; 50/51)
The non-directional overcurrent function is used for instant and time-delayed overcurrent and short-
circuit protection. The number of stages in the function depends on the relay model. The operating
decisions are based on phase current magnitude, constantly measured by the function. The available
phase current magnitudes are equal to RMS values, to TRMS values (including harmonics up to 32
nd
),
or to peak-to-peak values. 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 outputs of the function are the START, TRIP and BLOCKED signals. The non-
directional overcurrent 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) mode. The IDMT
operation supports both IEC and ANSI standard time delays as well as custom parameters. The
function includes CT saturation checking which allows the function to start and operate accurately
during CT saturation.
The operational logic consists of the following:
• input magnitude selection
• input magnitude processing
• saturation check
• threshold comparator
• block signal check
• time delay characteristics
• output processing.
The basic design of the protection function is the three-pole operation.
The inputs for the function are the following:
• operating mode selections
• setting parameters
• digital inputs and logic signals
• measured and pre-processed current magnitudes.
The function outputs the START, TRIP and BLOCKED signals which can be used for direct I/O
controlling and user logic programming. The function generates general time-stamped ON/OFF events
to the common event buffer from each of the three (3) output signals. In the instant operating mode the
function outputs START and TRIP events simultaneously with an equivalent time stamp. The time stamp
resolution is 1 ms. The function also provides a resettable cumulative counter for the START, TRIP and
BLOCKED events.
The following figure presents a simplified function block diagram of the non-directional
overcurrent function.
A
AQ
Q-C213
-C213
Instruction manual
Version: 2.04
106
Содержание AQ-C213
Страница 1: ...AQ C213 Capacitor bank protection IED Instruction manual ...
Страница 308: ...Figure 7 4 184 Example block scheme A AQ Q C213 C213 Instruction manual Version 2 04 307 ...
Страница 330: ...Figure 8 14 207 Panel cutout dimensions and device spacing A AQ Q C213 C213 Instruction manual Version 2 04 329 ...