The following figure shoes typical configuration connections required to utilize this filter in
conjunction with multi-purpose function as non-directional overcurrent protection.
IEC13000179-1-en.vsd
IEC13000179 V1 EN-US
Figure 306: Required ACT configuration
Such overcurrent arrangement can be for example used to achieve the subsynchronous
resonance protection for turbo generators.
12.1.3
Setting guidelines
12.1.3.1
Setting example
GUID-5A3F67BD-7D48-4734-948C-01DAF9470EF8 v2
A relay type used for generator subsynchronous resonance overcurrent protection shall be
replaced. The relay had inverse time operating characteristic as given with the following
formula:
01
op
s
K
t
T
I
=
+
EQUATION13000029 V1 EN-US
(Equation 549)
Where:
•
t
op
is the operating time of the relay
•
T
01
is fixed time delay (setting)
•
K is a constant (setting)
•
I
S
is measured subsynchronous current in primary amperes
The existing relay was applied on a large 50Hz turbo generator which had shaft mechanical
resonance frequency at 18.5Hz. The relay settings were T
01
= 0.64 seconds, K= 35566 Amperes
and minimal subsynchronous current trip level was set at I
S0
=300 Amperes primary.
Solution:
First the IED configuration shall be arranged as shown in
. Then the settings for
SMAI HPAC filter and multipurpose function shall be derived from existing relay settings in the
following way:
The subsynchronous current frequency is calculated as follows:
50
18.5
31.5
s
f
Hz
Hz
Hz
=
-
=
EQUATION13000030 V1 EN-US
(Equation 550)
Section 12
1MRK 505 343-UEN B
System protection and control
508
Application manual
Содержание Relion 670 series
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