
Table. 5.3.19 - 163. Event codes.
Event number
Event channel
Event block name
Event code
Description
6528
102
RPW1
0
Start ON
6529
102
RPW1
1
Start OFF
6530
102
RPW1
2
Trip ON
6531
102
RPW1
3
Trip OFF
6532
102
RPW1
4
Block ON
6533
102
RPW1
5
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 START, TRIP or BLOCKED. The table below
presents the structure of the function's register content.
Table. 5.3.19 - 164. Register content.
Date and time
Event
code
Trigger
power
Fault power
Pre-fault
power
Trip time
remaining
Used SG
dd.mm.yyyy
hh:mm:ss.mss
6528-6533
Descr.
Start average
power
Trip -20ms
averages
Start -200ms
averages
0 ms...1800s
Setting group
1...8 active
5.3.20 Voltage-restrained overcurrent protection (Iv>; 51V)
Short-circuits that occur close to the generator decrease the fault current which in turn inhibits the
operation of a high-set overcurrent stage. The decreasing voltage caused by these faults can be used
to decrease the current pick-up level and thus to improve sensitivity. This voltage-restrained
overcurrent protection function can be used as an alternative for the underimpedance function for
more sensitive short-circuit detection in generator protection applications.
When there is a short-circuit near the generator, the voltage decreases which in this function's case
decreases the overcurrent's pick-up level according to set parameters. The function can work as
voltage-controlled overcurrent protection or as voltage-restrained overcurrent protection. When the set
parameter value Ux2 is greater than Ux1, the protection function works as voltage-restrained
overcurrent protection. In this case the overcurrent pick-up value increases as the voltage increases
between the set values Ux1 and Ux2. The protection function uses positive sequence voltage to define
the pick-up level at that moment.
When the set value of Ux1 is equal to Ux2, the function works as voltage-controlled overcurrent
protection. Now the overcurrent protection doesn’t operate until a fault reduces the voltage below a set
value, usually about 80 % of the normal. A fixed pick-up level of voltage-controlled overcurrent
protection is easier to coordinate with other relays. However, the voltage-restrained overcurrent
protection function is less prone to making unwanted operations on motor starting currents and system
swings.
A
AQ
Q-F215
-F215
Instruction manual
Version: 2.04
228
Содержание AQ-F215
Страница 1: ...AQ F215 Feeder protection IED Instruction manual ...
Страница 430: ...Figure 7 4 261 Example block scheme A AQ Q F215 F215 Instruction manual Version 2 04 429 ...
Страница 452: ...Figure 8 14 284 Panel cutout dimensions and device spacing A AQ Q F215 F215 Instruction manual Version 2 04 451 ...
Страница 487: ...10 Ordering information A AQ Q F215 F215 Instruction manual Version 2 04 486 ...