Protection Of A H-Bridge Connected Capacitor Bank - ABB REV615 Product Manual

Capacitor Bank Protection and Control
REV615
Product version: 5.0 FP1
Standard configuration A is pre-configured for H-bridge
connected capacitor banks. Three-phase current unbalance
protection is used for unbalance.
Standard configuration B offers directional earth-fault
protection, residual voltage protection, overvoltage protection
and undervoltage protection functions. It is pre-configured for
double star connected capacitor banks. Single current
unbalance protection is used for unbalance.
GUID-B7F0755C-006A-4806-91D3-8C290EE3ECA0 V1 EN
Figure 3.

Protection of a H-bridge connected capacitor bank

Figure 3 illustrates the protection of an H-bridge connected
capacitor bank. Standard configuration A is used with overload,
three-phase connected current unbalance and undercurrent
GUID-5F33A1B7-2B6F-4CFA-9DD6-71E633C46846 V1 EN
Figure 4. Protection of a double star connected capacitor bank in a distribution network with a compensated or isolated neutral
Protection of a double star connected capacitor bank in a
distribution network with a compensated or isolated neutral is
shown in Figure 4. Standard configuration B is used with
overload, single phase connected current unbalance and
8
The second and third stage of the residual voltage protection in
the standard configuration B can be used as voltage-based
unbalance protection mainly for single star connected capacitor
banks, with unearthed star point. Dedicated voltage input Uob
is used for this purpose. This functionality is available in
standard configuration B and needs to be configured before it is
taken into use.
A
REV615
U12 0. 0 kV
P 0.00 kW
Q 0.00 kVAr
IL2 0 A
3I
I
ESC Clear
Std. conf.
O
R
L
ANSI
50L/50NL
Io
50P/51P
51C
51NC-2
51P/51N
55TD
3I
unb
protection for the capacitor bank. Overcurrent and earth-fault
protection functions are used for protecting the feeder cable
and capacitor bank combination.
3U Uo
3I
A
REV615
U12 0. 0 kV
P 0.00 kW
Q 0.00 kVAr
IL2 0 A
I
ESC Clear
Std. conf.
O
R
Io L
ANSI
27/59/59G
50L/50NL
50P/51P
51C
51NC-1
51P/51N
55TD
67N
I
unb
undercurrent protection for the capacitor bank. Overcurrent
and directional earth-fault protetion functions are used for
protecting the feeder cable and capacitor bank combination.
1MRS757952 D
A
IEC
ARC
3I>>>
3I> 3I<
3dI>C
3I>/Io>
TD>
B
IEC
3U</3U>/Uo>
ARC
3I>>>
3I> 3I<
dI>C
3I>/Io>
TD>
Io>→
ABB