Ormazabal ekor.rps, Общее руководство по инструкции

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IG-150-EN version 04; 03/10/16
60
Protection functions. Description and settings General instructions
ekor.rps
4.4. 2
nd
harmonic restraint
It locks the first level of the units 51, 50, 51N, 50N and 46
(time and instantaneous unbalance). For 50/51 units,
restraint is available for a single phase or for all phases.
If it is programmed as restraint of the phase itself:
In order to activate the locking, the following must be given
at least in this phase and simultaneously:
1. The fundamental current must be higher than the
minimum value for inrush.
2. The ratio between the 2
nd
harmonic value and the
fundamental one must exceed the threshold set.
3. The 2
nd
harmonic must be higher than 10 mA with
standard ratings, or higher than 50 mA with specified
ratings.
In order to deactivate the locking, the following conditions
must be fulfilled:
1. This phase is below the 95 % of the minimum current.
2. This phase is below the 95 % of the restraint percentage
threshold.
In this case it is the same for neutral.
If it is programmed as “restraint for all phases” it is enough
with the conditions of one phase in order to lock the rest.
If the conditions are given in one phase or in neutral, it is
enough to lock the unbalance functions.
The settings (6 tables) are those below:
Setting Min Max Step Notes
2nd harmonic restraint enable
NO
Restraint for phase
Restraint for all phases
Neutral enable
NO
YES
2nd harmonic threshold [%]
5 100 1
Phase minimum threshold [A]
0.1 200 0.01
Neutral minimum threshold [A] 0.1 200 0.01
The settings are located in the console in the “2
nd
harmonic restraint” and “manual closing protection blocking” screens.
Table 4.8.
Settings
4.5. Protection functions blocking with manual closing
This function is only available in the EH3211
model.
A “BLOQ. FUN. PROT. CM” signal is generated, which allows
to block any unit by means of logics.
This function is only active when the equipment is in manual
mode. The equipment is considered to be in manual mode
when the recloser is blocked by command, input, R key or
by setting. If the equipment is not provided with a recloser,
this function is always active.
This function is an OR of a function that controls the module
and another one that controls the argument of the positive
and negative sequences.
The conditions to activate the blocking signal are as follows:
1. I
2
> k*I
1
, where k can be set
2. Ang (I
2
) – Ang (I
1
) > Adj. Angle, where Adj. Angle can
be set
Each condition has its own activation. If they are both
enabled the output is an OR of both of them. If the reverse
and direct sequences are less than 0.15 A the function’s
output is zero and in this situation it is not possible to block
any functions.