Event block name
Event names
NOC4
Phase C Start OFF
NOC4
Phase A Trip ON
NOC4
Phase A Trip OFF
NOC4
Phase B Trip ON
NOC4
Phase B Trip OFF
NOC4
Phase C Trip ON
NOC4
Phase C Trip OFF
The function registers its operation into the last twelve (12) time-stamped registers; this information is
available for all provided instances separately. The register of the function records the ON event
process data for START, TRIP or BLOCKED. The table below presents the structure of the function's
register content.
Table. 5.4.3 - 69. Register content.
Date and time Event
Fault type
Pre-trigger
current
Fault
current
Pre-fault
current
Trip time
remaining
Used SG
dd.mm.yyyy
hh:mm:ss.mss
Event
name
L1-E…L1-L2-L3 Start/Trip
-20ms current
Start/
Trip current
Start
-200ms
current
0 ms...1800s
Setting group
1...8 active
5.4.4 Non-directional earth fault protection (I0>; 50N/51N)
The non-directional earth fault function is used for instant and time-delayed earth fault protection. The
number of stages in the function depend on the device model. The operating characteristics are based
on the selected neutral current magnitudes which the function measures constantly. The available
analog measurement channels are I01 and I02 (residual current measurement) and I0Calc (residual
current calculated from phase current). The user can select these channels to use RMS values, TRMS
values (including harmonics up to 32
nd
), or 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 non-directional earth fault 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 the time-delayed mode the operation can
be selected for definite time (DT) or for inverse definite minimum time (IDMT); the IDMT operation
supports both IEC and ANSI standard time delays as well as custom parameters. The function includes
the checking of CT saturation which allows the function to start and operate accurately even 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 inputs for the function are the following:
A
AQ
Q-C215
-C215
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00040
117
Содержание AQ-C215
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Страница 297: ...Figure 7 4 179 Example block scheme A AQ Q C215 C215 Instruction manual Version 2 07 Arcteq Relays Ltd IM00040 295 ...
Страница 318: ...Figure 8 14 200 Device installation A AQ Q C215 C215 Instruction manual Version 2 07 316 Arcteq Relays Ltd IM00040 ...
Страница 347: ...10 Ordering information A AQ Q C215 C215 Instruction manual Version 2 07 Arcteq Relays Ltd IM00040 345 ...